bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Molten Steel Mutual Mixing Law of Intermixing Slab of Different Grades Casting
Authors: Cao Tong You , Yang Xin Quan
Published: March 2013

Through chemical composition analysis of different grades casting intermixing slab with 0.40% carbon difference, a general law of molten steel mutual mixing has been drawn out. It reveals that different grades casting has a little effect on the tail-slab of former heat, but has a sever effect on the head slab of later heat.
XPS Analysis of Stainless Steel Plant Dust
Authors: Fan Wei , Ma Guo Jun
Published: March 2013

Due to the fact that it contains several kinds of toxic substances, stainless steel plant dust is regarded as a toxic solid waste. In this paper, XPS technique was employed to determine the elemental depth profiles on the surface of dust, especially Cr, in order to provide useful information on Cr(VI) formation mechanisms as well as the distribution of other element on the surface of stainless steel plant dust. The results showed that without sputtering with Ar ion beam, both Cr(VI) and Cr(III) exist on the surface of the dust. Cr(VI) mainly exists on the surface of the dust in the form of CrO3. When the sputtering time is from 0s to 80s, the substances exist on the surface of EAF dust are Cr2O3 and CrO3, and at the rest of the sputtering time, Cr2O3 is the only chromium-bearing substance existing on the surface of dust. When the sputtering time is from 0s to 80s, the substances exist on the surface of AOD dust are the same as the EAF dust. But at the rest of the sputtering time, Cr2O3 or FeCr2O4 are the chromium-bearing species.
The Technical Analysis of Energy Saving and Emission Reducing in China’s Iron and Steel Industry Based on LEAP Mode
Authors: Wang Bao Qing , Zhang Lei , Wang De Qing , Yin Shuai , Yao Shu
Published: March 2013

To assess some technologies which are more appropriate for the development of the iron and steel industry in China, a model was developed based on the Long range Energy Alternatives Planning System (LEAP) to assess the energy saving and CO2 reduction potentials from 2010 to 2040. The results show that the top three saving energy potentials is non-blast furnace iron-making accounted for 6.85%, device enlargement for 5.85%, advanced blast furnace for 4.84%, and also show that the top three CO2 reduction potentials is device enlargement accounted for 11.7%, non-blast furnace iron-making for 6.21%, advanced coke and blast furnace 5.52%. In the Mitigation scenario, it can reduce 28% of the initial energy demand and 35.2% of CO2 emissions. It can provide a method and data for search energy saving and CO2 reduction potentials in iron and steel industry by LEAP model.
Production of SG Grade Pig Iron in Mini Blast Furnace
Authors: Mahato Madan Mohan , Agrawal Mahesh Kumar , Sinha Sharda Nand
Published: March 2013

The entire life of a Blast furnace operator is spent to achieve the following aims: • To increase the productivity of Blast Furnace as high as possible. • To decrease the coke rate as low as possible to produce unit ton of hot metal. • To produce the hot metal of superior SG quality with particular reference to Sulphur & Silicon. • To keep the production cost as low as possible. The process indices of Mini Blast Furnace are similar to that of a conventional blast furnace. But, conventional blast furnace is capital intensive, solely dependent on good quality metallurgical coke, the gestation period is longer, and requires elaborate burden preparation. There is huge gap between demand and supply of steel in India. Also, India is dreaming to become developed nation by 2020. In such situations, the role of Mini Blast Furnace becomes very important. The slag chemistry is an important parameter to improve the process indices of MBF. The slag chemistry includes its chemical composition, liquidus temperature, fluidity, Sulphide capacity etc, which has an important bearing on the smooth & efficient operation of the MBF. The main important constituent of SG grade pig iron, particularly, Sulphur & silicon content should be 0.040% maximum and 1.20% to 2.20% maximum respectively. The chemical compositions of SG Grade Pig Iron is C- 3.80-4.20%, Mn – 0.35- 0.80%, Si – 1.20- 2.20%, S - 0.040% maximum and P – 0.15% maximum. The role of slag to produce such a low sulphur & low silicon in Mini Blast Furnace is very important. Therefore, to control Sulphur and silicon in SG Grade Pig Iron in Mini Blast Furnace, the optimisation of Slag Chemistry is an essential step.
Study on Technology of Iron Removal during Recycling of Shell of Investment Casting
Authors: Li Ji Gao , Li Yuan Cai , Wang Li Chi
Published: March 2013

Recycling of the shell of investment casting is meaningful. However，there are many factors which hamper the progress of this work, and one of these is that the Fe content is difficult to reach the standard under the present technological conditions. Through investigating and analyzing the sources of Fe in three factories which produce steel casting and a factory which is engaging in recycling of the shell of investment casting, a new idea which suggested to remove iron through controlling import of Fe form sources was put forward in this paper. To realize this idea, corresponding measures was suggested, such as classifying the shell, picking iron out manually, storing the shell appropriately, and selecting reasonable equipment for recycling processing.
Crystal Structure of bi(1,10-phenanthroline)- copper-Cl chlorine hydrate, [CuCl(C12H8N2)2]Cl0.5(H2O)5.5
Authors: Liu Hai Xing , Guo Huan Mei , Zeng Guang , Zhang Qing Hua , Yu Zhang Xue
Published: March 2013

A novel Cu metal complex [CuCl(C12H8N2)2]Cl 0.5(H2O)5.5 has been synthesized from a solution reaction and the crystal structure has been determined by means of single-crystal X-ray diffraction. [CuCl(C12H8N2)2]Cl 0.5(H2O)5.5, Monoclinic, C2/c. a=23.086(2)Å, b =30.090(3)Å, c=7.4580(8)Å, α=γ=90, β=97.67, V=5134.3Å3, Z=8, R1 =0.0923, wR2 =0.2182, T=298K. The crystal packing is stabilized by O-H...O and O-H...Cl hydrogen bonding and Л-Л interactions.
Treatment Investigation on Retting Hemp Waste Water with the Synergy of Activated Carbon and Microwave
Authors: Yang Rong , Feng Quan Li , Jia Yu , Shi Chun Mei
Published: March 2013

Treatment of retting hemp waste water was made by the synergy of activated carbon and microwave in this experimental investigation, and the four factors that influenced the experimental results were considered in which there were respectively the material ratio of activated carbon dosage and retting hemp waste water volume, microwave radiation power, microwave radiation time and the initial pH value of retting hemp waste water. The experimental results showed that, while the material ratio was 7:50 (i.e., the quality of activated carbon was 7g as the volume of retting hemp waste water was 50mL), the microwave radiation power and the microwave irradiation time were respectively 320W and 13min, and the initial pH value of retting hemp waste water was just 2, the treatment effect of retting hemp waste water was best in this experimental investigation.
Investigations on a Novel Process to Recycle Valuable Metals from Spent Al2O3-Based Catalyst
Authors: Shao Yan Hai , Li Ming Ming , Tong Xiong
Published: March 2013

Based on X-ray phase analysis and exploratory experiments, a novel process was proposed to recycle multiple valuable metals like Al, V, Mo, Ni and Co from spent Al2O3-based catalyst. The spent catalyst was roasted by adding sodium carbonate with certain mol ratio, after water leaching, Al, V and Mo could be extracted into leach liquor, whereas Ni and Co were enriched in the leaching residue. V and Mo were precipitated in step from leach liquor by adding CaO and BaAl2O4, respectively. After removal of V and Mo, Al(OH)3 was prepared from sodium aluminate solution with carbonation decomposition process, and the purity of Al2O3 is 99.98%. With sodium bicarbonate leaching-purification-precipitation-calcination process, V2O5 could be prepared from V-bearing residue. Ni and Co were leached from water leaching residue with sulfuric acid. Recoveries of Al, V, Mo, Ni and Co from spent catalyst are 87.0%, 88.7%, 92.1%, 97.8% and 98.6%, respectively.
A Combined Beneficiation Process to Recover Iron Minerals from a Finely Disseminated Low-Grade Iron Ore
Authors: Liu Si Qing , Zhang Min , Wang Wan Ping , Li Xiu Juan
Published: March 2013

In this research, a refractory iron ore is processed, according to the basic facts of mineralogical study. Mineralogy shows that the ore is characterized by the finely disseminated iron minerals with a small amount in the ore. Iron minerals in the ore are mainly hematite and magnetite. On the basis of the ore characteristic, a flowsheet of "stage grinding-low intensity magnetic separation-high intensity magnetic separation-gravity concentration by fine shaking table" was developed. An iron concentrate assaying 51.45% Fe at a recovery of 62.12% was obtained when the raw ore contains 18.61% Fe.
Application of Flotation Column on Flotation of Copper Ore
Authors: Zhang Yi , Wen Shu Ming , Liu Dan , Cao Qin Bo
Published: March 2013

Two flotation columns replacing traditional flotation machine and vertical agitate mill were successfully used on copper production in Yangla mine. With introducing of these advanced machines, chalcopyrite with fine dissemination size could be absolutely liberated. In addition, the technological process was further optimized. And Cu grade was improved by 3%, the recovery of Cu, Au and Ag were improved by 3% respectively.
Centrifugal High Gradient Magnetic Separation of Fine Ilmenite
Authors: Chen Lu Zheng , Xu Guo Dong , Huang Jian Xiong , Wen Shu Ming
Published: March 2013

Centrifugal High Gradient Magnetic Separation (CHGMS) was creatively developed, and in the present investigation was used for the concentration of fine ilmenite from tailings through a cyclic pilot-scale CHGMS separator, to study the effect of two key parameters, i.e., magnetic induction and rotation speed of matrix, on the separation performance of the separator. The results of investigation indicates that the CHGMS is effective in concentrating the ilmenite; an increase in the rotation speed increases concentrate grade but reduces recovery of TiO2, and this is reverse for the induction. While the two parameters were optimized, a concentrate assaying 19.42% TiO2 with 80.72% recovery of TiO2 is achievable from the tailings assaying 8.18% TiO2. It was concluded that the CHGMS provides a prospective technology for the concentration of fine ilmenite.
Different Slurry Concentration on Settling Effect of the Iron Tailings
Authors: Shi Zhi Xin , Zhou Xing Long , Luo Wen Bin , Liu Zheng Qiang , Sun Dong Yang , Zhang Xiao Ming
Published: March 2013

We used the iron tailings with different concentrations of raw slurry and the classifier overflow after desliming for natural sedimentation and adding flocculants flocculating sedimentation test research. The results show that: the settling velocity is slower during the natural sedimentation, The effect that concentration on the settling velocity of material is larger, with the increase of concentration, particle settling velocity drop, When the concentration reached 20%, material group is in a state of suspension, particle is essentially not settlement; Adding polyacrylamide flocculant for the pulp material pretreatment, the settling velocity is obviously improved than natural sedimentation, Supernatant turbidity also decreased significantly, but the pulp concentration still has a great influence on the sedimentation rate, the higher the concentration of the settlement, the slower settling velocity. The test result is according to the theoretical formula of settlement.
Grate-Rotary Kiln Pellet Technology of Chromite Concentrate and Study on Mass Balance Calculation
Authors: Wang Dai Jun , Wu Sheng Li
Published: March 2013

The grate-rotary kiln pellet process of chromite concentrate, which is not only complying with the chrome ore agglomeration process, but also meeting the development of grate-rotary kiln pelletizing technology, and is an effective mearsure of increasing use of high-carbon ferrochrome as well. In this work, aiming at study on grate-rotary kiln pellets of 0.3Mtpa chromite concentrate’s mass balance calculations, the results show when the material is in the specific surface area of 1700cm2/g, the compressive strength of 11 N per pellet, drop number of 5 times from 0.5m height and cracking temperature of 435°C are achieved, especially cracking temperature is higher than the highest temperature of grate DDD 400°C. Measuring and calculation of dehydration loss, ash content and bulk material loss, as well as reduction loss and oxidation loss of coke powder of the green pellet are achieved. The reduction degrees of FeO and Cr2O3 are 68.06% and 52.24% respectively, and comprehensive reduction degree is 58.52%. In this research, the mass balance table of payments of the grate-rotary kiln system is listed, and a detailed mass balance diagram is also obtained.
Investigation on Molybdenite Separation from a Complex Sulfide Ore
Authors: Cao Qin Bo , Wen Shu Ming , Li Chen Xiu , Bai Shao Jun , Liu Dan
Published: March 2013

A Mo middling has been obtained through Cu-Mo bulk flotation. In order to further enrich molybdenite and separate pyrite form this middling. A series flotation tests were conducted to concentrate Mo. Important parameters including regrinding fineness, CaO dosage and cleaning flotation stages were optimized to enhance Mo enrichment. In addition, a close-circuit flotation test was conducted under optimum parameters and a Mo concentrate with 22.92% of Mo grade and 93.75% of Mo recovery was obtained, which satisfied the plant requirement.
Recovering Limonite by High Intensity Magnetic Separation Technology from Honghe Limonite Ore
Authors: Xu Guo Yin , Liu Dian Wen , Wang Pu Rong , Xu Bing Liang , Zhao Wen Juan , Yuan Jing Jie
Published: March 2013

High intensity magnetic separation tests have been carried out on the oolitic limonite ore with complex relations between limonite and gangue minerals of Honghe prefecture, and a optimal flowsheet for recover limonite from run-of-mine was adopted at last. High intensity magnetic separation flowsheet with one stage rougher, cleaner and scavenger, which have been studied respectively. Iron concentrate containing 55.18%Fe could be obtained at yield of 53.20% and recovery of Fe 68.45 % in closed circuit test.
Research on Process Mineralogy of some Pyrite Cinder
Authors: Li Zheng Yao , Chi Wei Gang , Liu Jun , Guo Xiao Fan , Li Heng Qian
Published: March 2013

The characteristics of process mineralogy of some pyrite cinders were studied with optics microscopes, scanning electron microscope, and x-ray diffraction. The chemical composition and the phase composition of the pyrite cinders were analyzed. The occurrence and chemical phase analysis of molybdenum of iron, copper, and gold were also studied. The behaviors of various minerals and mineralogical factors affecting the separation had been explained clearly. The investigation results were favorable to reasonable selection of technological process.
Process Mineralogy and Flotation Kinetic of a Copper Oxide Ore during Sulfuration Flotation
Authors: Xiong Kun , Zheng Gui Shan
Published: March 2013

This study aims to investigate the process mineralogy of the Dishui copper ore in Xinjiang and determine the flotation kinetic equations of this copper ore during the sulfuration flotation process. The results indicate cuprite is the main form of oxide copper minerals, which is difficult to be vulcanized and floated. The fitting of flotation date to a flotation kinetic equation shows that the copper oxide ore, cuprite, malachite and chrysocolla in this ore are consistent with a first order kinetic equation. The rate constants for copper oxide, cuprite, malachite and chrysocolla are 0.152, 0.104, 0.248 and 0.210 respectively. Thus, the flotation of cuprite in the ore is very important to improve the total recovery of the copper oxide ore.
Research on Log-Weibull Distribution and its Application in Statistical Distribution of Coal Cuttings Particle Size
Authors: Zhang Xian Shang , Wen Guang Cai , Long Qing Ming , Yang Hui Ming
Published: March 2013

In this work, we reveals the statistical distribution law of 1-3mm coal particle size by MATLAB and the definition and probability distribution function of log-Weibull distribution. In order to get the theoretical probability model of the particle size distribution, we studied the parameter estimation of Weibull, lognormal and log-Weibull distribution though using the maximum likelihood estimation method. The comparison criterion Cc was introduced to evaluate the difference between the theoretical probability density model and the actual experimental data distribution. The results of comparison criterion shows when the particle size has a smaller intervals, log-Weibull distribution is better to predict the experimental data than Weibull distribution and has a smaller change with the different intervals of particle size than others.
Surface Analysis of Collophane by X-Ray Photoelectron Spectroscopy
Authors: Huang Xiao Fen , Zhang Qin , Peng Chuang
Published: March 2013

The surface element distribution, valence and relative density of marine sedimentary phosphate ores from Guizhou province were analyzed by X-ray photoelectron spectrometric(XPS). The effect and mechanism of flotation reagents on collophane flotation was discussed. The raise of C content indicates that the collector can be adsorbed on collophane surface. After treatment with Ca2+, the new compound formed on collophane surface is similar to that before the treatment. No Fe and Mg have been observed after treatment with Fe3+ and Mg2+. The reason might be Ferric and magnesium hydroxide and hydroxo complex absorption occurs on the surface. Then, Fe and Mg2+ could consume collector because of the formation of precipitate resulting from chemical reaction. In other words, Fe3+ and Mg2+ are covered with collectors, thus, they can’t be observed by XPS.
Research in Surface Modification and Anti-Fouling of Polypropylene Porous Membrane
Authors: Miao Chao Lin , Wang Hui
Published: March 2013

Surface modification of microporous polypropylene membrane was performed by grafting polymerization of acrylamide.The morphological and microstructure changes of the membrane surface were confirmed by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy and atomic force microscopy. The results indicate that the pore size of the grafted membrane was reduced.
The Harmonious Design on the Beneficiability of the Pt-Pd Ores Containing High-MgO Gangues in Yunnan
Authors: Tang Min , Wen Shu Ming
Published: March 2013

Flotation characteristics of the fine-disseminated copper-nickel sulfides containing Pt and Pd and thermodynamic properties of high amounts of serpentine gangues by diluted acidic leaching in the ore sample of Yunnan were investigated by bench flotation tests and acidic leaching tests and their combination tests have also been conducted to exploit the harmonious design to extract all the values from the ore sample. Based on the results of bench flotation tests, it has been suggested that traditional flotation with the target of only metallic values in the ore was not available and profitable due to the fact that it was inevitable of the deteriorated dilution of serpentines in the flotation concentration using common various kinds of flocculants or depressants, in which the content of MgO in the concentrate was around 20.0%, while leaching tests by waste acids from producing TiO2 indicated that this may be a promising method to extract MgO andα-Fe2O3 from the ore sample, since it can weaken the disturbance of serpentines significantly and lead a satisfied results of the Cu-Ni sulfide flotation. In this study, a harmonious flow-sheet, which involves leaching by waste acids and traditional flotation process, had been designed with the objective of extracting the metallic values and two non-metallic products, which includesα-Fe2O3 and MgO, from the ore sample. It is worthy noticed that the acidic waste liquids from a TiO2 company in Panzihua was used as leaching agent, which can dissolve 98.81% Mg2+ and 78.43% Fen+ with little Ni2+ and Cu2+. By the comparison of the flotation results and benefits between traditional flotation alone and harmonious design, besides the two more qualified non-metallic products, α-Fe2O3 and MgO, a better concentrate containing a grade of only 2.64% MgO at the grades of 2.58% Cu, 2.97% Ni and 81.02 g/t Pt+Pd with the recoveries of 93.79% Cu, 83.14% Ni and 79.19% Pt+Pd respectively, were harvested from the harmonious design.
Numerical Simulation of Mixed Emulsion Explosive Charging in Water-Filled-Hole
Authors: Ye Hai Wang , Nong Dong Ling , Li Ting , Ye Jie Wang
Published: March 2013

When charging in water-filled-hole with emulsion mixed loading truck, if the charging hose can not reach the borehole bottom, there will be a water column in the charge. Emulsion explosive charging in water-filled-hole is simulated under three conditions with different water levels, charging velocity and hole diameter when the hose of the explosive mixed loading truck does not reach the hole bottom. The results show that explosive can not reach the bottom of the blasthole if the water depth exceeds the maximum effective range of the jet flow, which is proportional to charging speed and hole diameter, and there will exist a water column at the bottom of the hole. To prevent that, the distance between the hose outlet and the hole bottom must be shorter than the effective range when charging. Besides, increasing charging velocity also works.
Analysis of Sealing Ability of Premium Tubing Connection under Axial Alternating Tension Load
Authors: Dou Yi Hua , Wang Xing , Yu Yang , Yang Xiang Tong
Published: March 2013

In order to know the sealing ability under axial alternating tension load, a 88.9mm×6.45mm P110 premium tubing connection is established with multiple linear elastic plastic finite element model, stress and contact pressure on sealing surface and torque shoulder are analyzed under axial alternating tension load and 80 MPa inner pressure. The results show that tubing connection slide by the axial tension, while the maximum contact pressure on seal surface reduced. With the increasing of alternating cycle, the maximum equivalent stress on seal surface increased and the maximum contact pressure on seal surface decreased. And, under limited loads, contact pressure on torque shoulder is affected little caused by alternating load.
The Field Test about CO2 in Low Permeability Oilfield of Daqing Outskirt
Authors: Xia Yao Xian , Kang Jing Shui , Cai Yi Na , Zhao Wen Xiu
Published: March 2013

Note CO2 gas development has become a very effective reservoir mining method in low permeability oilfield of Daqing outskirt. It can effective enhance the recovery ratio. When the crude oil dissolves CO2, the volume expands and the viscosity decreases. Under the same conditions of temperature, expansion increases with pressure, CO2 drive is more effective than a single water drive, the degree of reserve recovery has been significantly improved, generally 1.3-1.4 times. Field tests shows that the input-output ratio in swallowing- spitting test of CO2 producing in formation could reach 6.25.
The Pressure Drop Calculation of Sea Water Pipe with No Heat Oil and Gas Transferring
Authors: Gao Yang
Published: March 2013

This submarine pipeline was used to transport water originally, however, it is an oil-gas mixed transportation pipeline without heat preservation now. Because of the differences between the physical properties of oil-gas and water, we should take the gas and liquid viscosity, density and interfacial tension and other factors into account to establish a new submarine pipeline pressure drop model .In this passage, according to the field data provided by the 20B platform, 20A platform, 251B platform, cb502 platform of submarine pipeline, we apply the methods of comparative analysis and mathematical simulation to establish Beggs-Brill submarine pipeline pressure drop model and the temporary oil-free thermal insulation of the pressure drop and mathematical model, we also make the analysis of a variety of factors impacting on the pipeline pressure drop, including the starting temperature of media, gas liquid flow rates, pipe diameter, angle of inclination，Provide a reference basis to design submarine pipeline.
Research on Gas Temperature Affect on Pharmacy Dust Explosion Pressure in Transport Pipeline
Authors: Zhang Xiao Liang
Published: March 2013

This document has firstly been established explosion combustion velocity model in trasport pipeline, analysis on gas temperature effect on dust explosion strength. Gas temperature at 40 °C~ 60°C on the potassium clavulanate mixed dust explosion experiment are studied in the pipeline. The experiment indicates that dust explosion pressure change as gas temperature at 40°C, 46.3°C, 50.5 °C, 54.1°C, 55.8°C, 59.7°C, The studies show that gas temperature rise causes dust explosion pressure pipeline center development,bring piston wave phenomenon.Dust explosion pressure maximum value is get up to 375kPa and negative pressure value is 875kPa.
Study on the Properties of Fe3+ Sorption to SrZr4(PO4)6 Materials
Authors: Yang Jin , Zhu Lin Hua , Si Tian
Published: March 2013

SrZr4(PO4)6 (SZP) materials were synthesized by precipitate method and dispersed by small molecular solvent. The properties of adsorption materials SZP to Fe3+ have been examined. The equilibrium adsorption indicated that the adsorption equilibrium time of SZP to Fe3+ was 16h at room temperature, and the equilibrium adsorption capacity was 0.318~0.924mg Fe3+/gSZP. The adsorption capacity of 60°C is less than 20°C’s. In addition, the optimum dosage of the SZP adsorbent was 3g , and the corresponding adsorption ratio is 50% .
Failure Analysis of Pipe's Repaired Mouth and its Improvement Measures and Suggestions
Authors: Li Qin , Jing Shuang , Huang Zhi Qiang , Wang Wei Bin , Wang Ming Bo , Chen Zhen
Published: March 2013

With the increment of the oil-field extract strength and the pipeline infusion load, the pipeline damage had become more serious and the effective use of cycle got shorter. Pipeline damage mainly appeared pipeline corrosion. The pipeline corrosion mainly occured in the place of pipe's repaired mouth and mending of blemishes. In this paper, through failure analysis of the pipe's Heat Shrinkable Wraparound Sleeve (HHWS) repaired mouth, we found the failure modes and failure causes of the repaired mouth of the existing pipeline and new pipeline, and grasped the failure mechanism. Then, improvement measures and suggestions were proposed to prevent failure, ensure safety, improve quality of the pipe's repaired mouth, slow or prevent pipeline corrosion and extend pipeline life.
Analysis on Influence Factors of Top Corner Gas Concentration and Trend Prediction
Authors: Liu Shui Wen , Qu Shi Jia , Li Ji Lai , Dai Lin Chao
Published: March 2013

To prevent the top corner gas on coal face concentration exceeded and the gas accident, The influence factors of gas concentration were analyze, the model of top corner gas concentration forecast was constructed based on chaos theory, and analyzed the real gas concentration data, forecasted the future data of the coal mine. The results show that top corner gas is influenced by the factors such as ventilation way, gas content, coal output and so on, the maximum Lyapunov exponent is 0.068, the time series is chaotic, and in the phase space, time delay is 4, embedding dimension is 3, the model parameter a is 1.221 7, b is -1.044 7, the absolute error is -0.024~0.031, the relative error is -2.82%~3.99%, and RMSE (root mean square error) is 0.014 9, the predictive results tally with the real ones, which can guide gas management work.
Modelling and Experimental Research of Spontaneous Combustion of Coal
Authors: Jiang Meng , Li Wei
Published: March 2013

Spontaneous combustion of coal is an important problem in mining and storage, in terms of both safety and economics. The heat of the reaction accumulates and the reaction becomes progressively faster and thermal runaway may take place to the point of ignition. A detailed computer model has been developed to simulate a bulk-scale, one-dimensional test column. A column is used in this laboratory to conduct a practical test capable of providing reliable data on coal self-heating. Under the speciﬁc conditions considered in this study, it is shown that a subbituminous coal can reach thermal runaway in 4.5 days. The results obtained in this study indicate that there is a deﬁnite need to consider the inﬂuence of coal moisture on spontaneous combustion.
The Geometry Structures and IR Properties of the Urea-Based Derivation Functional Molecular Materials Used for the Chlorine Anion Recognition
Authors: Yuan Kun , Zhu Yuan Cheng , Liu Yan Zhi , Tang Hui An
Published: March 2013

The geometry structures and IR properties of the non-involving fluorine (A) and involving fluorine (B) urea-based derivation receptors used recognition for chlorine anion (Cl-) was investigated by using the density function Becke, three-parameter, Lee-Yang-Parr (B3LYP) method. The involving fluorine urea-based derivation receptor (B) presents a better recognition capable for the Cl-. In the A…Cl- recognition system, the stretch vibrational frequency of the N-H bond presents an obvious red-shift, and the red-shift value higher than 12.4 cm-1, moreover, the IR intensity increased from 8.26 km•mol-1 of the monomer to 312.12km•mol-1 of the recognition system. However, as for the C-I bonds of the halogen bond donors of the receptor molecules A and B, their stretch vibrational frequencies present the different potential shift.
Study on Fuzzy Comprehensive Evaluation System in Mine Safety Based on AHP
Authors: Qin Tao , Dong Chang Ji , Liu Yong Li
Published: March 2013

First, the index system is established for coal mine safety evaluation according to the influencing factors of coal mine safety. Then, weights of mine safety estimation factor is determined by using Analytic Hierarchy Process(AHP).Last，mathematical model of fuzzy comprehensive evaluation is set up for coal mine based on fuzzy theory and used to safety evaluation of a state-owned coalmine . The researched index system is feasible and effective; weights of mine safety estimation factor are responsed through this index system which can be used widely in the coal mine safety evaluation and administrative decision.
Design and Implementation of Magnetic Bearings for Vertical-Axis Wind Turbine with Permanent Magnetic Synchronous Generator
Authors: Chen Meng Jen , Wu Yu Chi , Liao Jie Lu , Lin Jin Yuan , Chiang Hsien Yin , Huang Wen Liang
Published: March 2013

In this paper, the design and implementation of a passive magnetic bearing for a vertical-axis wind turbine with a permanent magnetic synchronous generator (PMSG) is presented. By applying a commercial analysis software for electromagnetics, the design of the magnetic bearing is discussed first, then the design of the structure of the wind generator is proposed. The proposed design successfully lifts a PMSG, and the wind turbine generates electric power, decreasing the physical contact largely and the noise and increasing the longevity of the rotating components.
A Comparison of the H3PW12O40/MCM-41 and HY Zeolite for Alkenylation of p-Xylene with Phenylacetylene
Authors: Zhao Zhong Kui , Dai Yi Tao
Published: March 2013

The initial activity, selectivity, and especially catalytic stability of mesoporous MCM-41 supported phosphotungstic acid (HPW) prepared by ultrasonic-assisted impregnation (UAI) method and the HY zeolite were contrastively investigated for alkenylation of p-xylene with phenylacetylene in a fixed-bed continuous flow reactor. N2 adsorption-desorption, FT-IR, X-ray diffraction (XRD) and NH3 temperature-programmed (NH3-TPD) desorption characterization techniques were employed to explore the relationship of catalyst nature and catalytic performance in alkenylation. Results illustrate that the as-prepared HPW/MCM-41 catalyst exhibits notably superior catalytic activity, selectivity and stability to microporous HY zeolite, ascribed to its well-ordered mesoporous architecture, appropriate acidic sites and high dispersity of HPW phase.
Simulation Study of a Novel Controllable Metamorphic Palletizing Robot Mechanism
Authors: Wang Ru Gui , Yuan Hua Qiang , Shi Guang Lin , Chen Hui Qing , Li Ye Xun , Zou Qing Ming
Published: March 2013

The palletizing robot mechanism was investigated in this paper. The concepts of the metamorphic mechanism and controllable mechanism were introduced into the design of palletizing robot mechanism, a novel controllable metamorphic palletizing robot mechanism with geometric limit, which can achieve a variety of flexible action, was designed. The working space of output of the controllable metamorphic palletizing robot mechanism was obtained through simulation study, and the kinematics characteristics of the mechanism were analyzed. The work of this paper provides some references for the practical application of such kind of mechanism in the palletizing robot.
Study on the Standardized Design of Belt Conveyor Based on Synchronous Technology
Authors: Wang Xue Jun , Xu Ping , Chi Yi Lin , Liu Hong Bin , Ding Yan Fang , Hua Bin
Published: March 2013

Belt conveyor is widely used in all kinds of automatic production line and bulk material delivery is its important applications. In order to improve the operation accuracy of the belt conveyor, in addition to strictly control the production process, tracking the manufacturing process, the most important thing is to improve the design level and design efficiency. The research used Solid Edge ST4 three-dimensional synchronous modeling technology to complete 3 d model design of belt conveyer, at the same time for the standardization of belt conveyor design research. Standardized design uses synchronous modeling, modular design technology, top-down assembly modeling technology complete standardization process from scheme design to detail design. According to the structure characteristics of belt conveyor, the integral reasonable structure is divided into several modules, modules are related by key parameters. When you modify the parameters related to realize the automatic modification of model of the structure, the standardization of product design is promoted. Research focuses on synchronous modeling technology in three dimensional modeling design and application of a belt conveyor design standardization implementation, validating the fusion of synchronous modeling technology in different design module. Through the module assembly process, within the scope of certain and realize module exchange, so as to realize the belt conveyor series, universal design. To realize the standardization of structure design can reduce repeated design and design errors, thus greatly improve the engineer design efficiency.
The Application of the Large Center Distance Planer Double-Enveloping Multithread Worm Pair on the Wide-Thick Plate Rolling Mill
Authors: Wen Qing Ming , He Guo Gang , Zhou Liang Yong
Published: March 2013

The paper analyzed the advantage of the planer double-enveloping worm pair and the development and application of the large center distance planer double-enveloping worm in detail. The economic effect is remarkable. Many new technologies were developed and applied in the program and they have good promotion application prospect.
Understanding the High Sensitivity of Parallel WO3 Sensor Toward NO2 Gas at Low Temperature
Authors: Yan Ai Hua , Xie Chang Sheng , Huang Fei , Li Hua Yao , Zhang Shao Liang
Published: March 2013

Tungsten trioxide (WO3-x) with different morphologies was synthesized by hydrothermal method. Using a pair of Pt electrodes and Al2O3 ceramics tube as a substrate, NO2 sensing properties of the WO3 products were measured at different working temperatures. And the high sensing properties at low working temperature were also investigated. The results showed that the sensitivity of WO3 product is strongly dependent on morphology and structure. The parallel circuit mode also plays an important role in the NO2 sensing characteristics. The low working temperature can be attributed to the competitive reaction between O2 and NO2 gas. The parallel mode may increase the lifetime of sensor.
A New PMU-Based Fault Location Algorithm for Three-Terminal
Authors: Shen Hong Yu , Zhang Wen Jun , Duan Yu Bo , Xu Jian Jun
Published: March 2013

Existing two-terminal fault location method can not be directly applied to the three-terminal transmission lines, this paper presents a new PMU-based fault location algorithm for three-terminal transmission lines. The development of the algorithm takes advantage of PMU measurement data synchronization, uses distributed parameter line model, first of all judging the fault zone after a failure, uses Thevenin's Theorem to merge the non-slip fault, so the three-terminal system is simplified the two-terminal system, Then we can use the two-terminal fault location principle of fault location. Through MATLAB simulation shows the correctness of the algorithm.
A Random Particle Swarm Optimization Algorithm with Application
Authors: Pan Jun Hui , Wang Hui , Yang Xiao Gang
Published: March 2013

To improve the efficiency of particle swarm optimization, a random particle swarm optimization algorithm is proposed on the basis of analyzing the search process of quantum particle swarm optimization algorithm. The proposed algorithm has only a parameter, and its search step length is controlled by a random variable value. In this model, the target position can be accurately tracked by the reasonable design of the control parameter. The experimental results of standard test function extreme optimization and clustering optimization show that the proposed algorithm is superior to the quantum particle swarm optimization and the common particle swarm optimization algorithm in optimization ability and optimization efficiency.
An Improved MeanShift Insulator Image Segmentation Algorithm
Authors: Ting Fang , Zhao Yun Biao , Hu Xing Liu , Bing Xia
Published: March 2013

According to color characteristics of insulator ,The paper is based on HSI model and Mean Shift algorithm in order to segmentation insulator images. It firstly introduces theory of mean shift algorithm, then explains morphological processing with edge detection algorithm to extract the insulator images contour. Last using Hough transform to obtain the segmentation results. Experiment indicates that VC6.0 combined with opencv simulation the proposed algorithm could effectively extract segmentation of insulator images provides the basis for follow-up determination of insulator faults.
The Information Key Technologies for Quality & Safety Monitor and Management of Agricultural Products
Authors: Yu Ying , Li Jin , Qin Xiang Yang
Published: March 2013

This paper studied on the information key technologies which were applied in quality & safety monitor and management of agricultural products and pointed out that the important role of the information technologies. The rapid detection technology included of three aspects: quality inspection (machine vision, near infrared spectroscopy, electronic nose etc), pesticide residue detection (ELISA, biosensor and Raman spectra etc), and producing environmental monitoring (mainly used x-ray rapid measurement of soil heavy metals etc), using of these technologies, some advanced new detection systems and devices to be developed gradually. Referred to auto identification technology, the common technologies of bar codes and RFID were introduced. They were widely used in the building of an agricultural products quality & safety traceability management system, which could cover production, processing, circulation and consumption etc whole process, and is helpful in agricultural products recall. In the system or platform of quality and safety agricultural products, network technology and database technology were applied to supply and demand inquiry, tracking and other function.
Isolation of Oxymatrine from Alkaloids of Sophora Flavescens Ait. by H103 Macroporous Resin
Authors: Li Xia , Du Ai Ling , Du Ai Qin , Wang Yan
Published: March 2013

An efficient and environment-friendly macroporous resin column chromatographic separation method has been developed for preparative isolation of oxymatrine from alkaloids of Sophora flavescens Ait. in the present study. The static adsorption ratios of nine macroporous resins were evaluated. The results demonstrate that H103 macroporous resin, showing high adsorption and desorption capacity, is suitable for separation of oxymatrine. The optimal parameters are obtained: the H103 resins are packed with ethanol, height-diameter ratio (H/D in short) of H103 resin-packed chromatogram column is 33:1, the elution program is 30% C2H5OH-25% NH4OH (115:1, v/v) at flow rate of 2.0 mL/min. After isolation on resin column chromatography, target compound is adequately separated from interferences; the purity of oxymatrine is increased to 91.53% by GC-MS analysis and the recovery yield of oxymatrine is 78.19%.
Development of Health Monitoring Instrument Based on LabVIEW
Authors: Ye Heng , Guo Yu , Wang Zhi Dong
Published: March 2013

Due to the high risk of heart disease，expensive monitoring costs, the unequal distribution of medical resources, the development of home-based health monitoring systems is worth addressing, the construction of a low-cost home-based electrocardiography (ECG) monitor is introduced. It can make related judgments on the health status of the check-up people according to the ECG signal. By utilized the LabVIEW2009 virtual instrument developing platform, a virtual health monitor for common family is set up. It includes some useful functions, such as preliminary ECG monitoring, automatic diagnosis, navigation and remote monitoring, which endow it with a potential value.
Optimization of Difenoconazole Suspension Concentrates Formulation with Orthogonal Method
Authors: Zhang Bao Hua , Lu Fu Sui , Wang Juan
Published: March 2013

The formulation of Difenoconazole Suspension Concentrates (SC) was optimized with the orthogonal design method.Results showed that the optimum formulation separation rate was 6.6% and the decomposition rate of the active ingredient was less than 3.0% in heated storage, and accorded with the requirements of SC. It would has broad application prospects for its safer, less toxic and more environmentally friendly.
Synthesis and Solubilities of 2,6,7-Trioxa-1-Phospha Bicycle [2,2,2] Octane-4-Carboxylic Acid 1-Oxide in Selected Solvents
Authors: Bian Zhan Xi , Yun Guan Qun , Fan Rui Lan , Guo Lai , Chen Shu Feng
Published: March 2013

A phosphorus-containing flame retardant 2,6,7-trioxa-1-phospha bicycle [2,2,2] octane-4-carboxylic acid 1-oxide (PBCC) was synthesized. The structure and the thermal stability of the compound were characterized by infrared spectroscopy (IR), nuclear magnetic resonance (1HNMR and 13PNMR), mass spectroscopy (MS), elemental analysis, and thermogravimetric analysis (TGA).Using a static analytical method, the solubilities of PBCC in ethanol in the temperature range from 298.90 to 343.20 K and in water in the temperature range from 298.85 to 363.20 K were determined. The solubilities of PBCC in methanol and acetonitrile1 were also measured for comparison. The solubility data were correlated with an empirical equation.
Density Functional Study of H2S Adsorption on Small Agn (n = 1–5)
Authors: Wen Jun Qing , Yang A Ping , Chen Guo Xiang , Zhang Chen Jun
Published: March 2013

The global-minimum geometries and electronic states of AgnH2S (n=1-5) clusters have been calculated using density-functional theory. Our calculations predicate that the stable geometries of AgnH2S clusters can be got by directly adding the H2S molecule on different site of Agn clusters, Agn (n=1-5) clusters would like to bond with sulfur atom and the H2S molecule is partial to hold the top location and single fold coordination site in the clusters. After adsorption, the structures of Agn clusters and H2S molecule keep the original structures and are only distorted slightly. The averaged binding energy reveals that adsorption of H2S molecule can strengthen the stabilities of AgnH2S clusters. The second difference in energy and the energy gaps between the HOMO and LUMO of Agn and AgnH2S have been studied.
A New Route to Synthesis of Titanium Silicalite-1 by Ball-Milling
Authors: Zhang Jun , Qiao Sheng Ru
Published: March 2013

Titanium Silicalite-1 (TS-1) was successfully synthesized from amorphous silica and titania powders by using a ball-milling method. In this method, amorphous fumed silica and anatase titania powders were ground in a planetary ball mill to produce a silica-titania precursor. The obtained precursor was then hydrothermally treated where TPABr was used as a template to obtain titanium silicalite-1 (TS-1). The XRD and UV-vis spectra indicate that the titanium in anatase with octahedral coordination is incorporated into the silica-titania precursor and the final TS-1 framework with a tetrahedral coordination. SEM image shows that TS-1 synthesized in this work appears in a shape of elongated prism with a dimension of about 3μm×1μm×0.2μm. This method gives a simple new approach to the synthesis of TS-1 using inexpensive silicon source, titanium source and template.
Catalytic Methoxycarbonylation of 1,6-Hexamethylenediamine with Methyl Carbamate to Dimethylhexane-1,6-Dicarbamate
Authors: Han Bing , Zhao Wen Bo , Qin Xian Ye , Li Yan Hong , Wei Wei
Published: March 2013

A series of metal oxides were employed as catalysts for the synthesis of dimethylhexane -1,6-dicarbamate(HDC) from 1,6-hexamethylenediamine(HDA) and methyl carbonate(MC). Lead dioxide showed excellent catalytic activity, 100% HDA conversion and 93% HDC yield could be achieved at 463K for 6h. The effects of reaction temperature, reaction time and catalyst amount on the yield of HDC were investigated in details.
Catalytic Degradation of Azo Dye Congo Red in Aqueous Solution by LiMn2O4
Authors: Long Yun Hui , Guo Jun Ming , Huang Du Shu , Liu Gui Yang
Published: March 2013

Catalytic degradation of azo dye Congo red in aqueous solution by spinel LiMn2O4 was studied. Degradation conditions were also optimized by orthogonal experiment. The results showe that the optimal degradation experimental conditions are: The initial pH is 3.0; The amount of catalyst is 10.0 mg; The amount of 30% H2O2 is 2.00 mL. The decolourization ratio of 20 mL 20 mg/L Congo red solution is 85.95%.
Influence Factors of Denitration Study on Catalyst Mn-Ce/TiO2
Authors: Geng Chun Xiang , Chai Qian Qian , Yao Wei , Wang Chen Long
Published: March 2013

Selective Catalytic Reduction (SCR) processes have been one of the most widely used denitration methods at present and the property of low tempreture catalyst becomes a hot research. The Mn-Ce/TiO2 catalyst was prepared by incipient impregnation method. The influence of load capacity, reaction temperature, O2 content, etc. on denitration were studied by a fixed bed catalyst reactor with ammonia gas. Results showed that catalyst with load capacity 18% performed high NO removal rate of 90% at conditions of reaction temperature 160°C, low space velocity, NH3/NO molar ratio 1: 1, O2 concentration 6%.
Kinetic Study of the Diels-Alder Reaction of Cyclopentadiene with Bis(2-Ethylhexyl) Maleate
Authors: Park Jun Seong , Yun Dae Hee , Ko Tae Won , Park Yong Sung , Woo Je Wan
Published: March 2013

The kinetics of the Diels-Alder reaction of cyclopentadiene with bis(2-ethylhexyl) maleate has been studied at temperatures between 25 and 100 °C and at atmospheric pressure. The influence of temperature on the kinetic constants was determined by fitting the results to the Arrhenius equation. As a result, fitting line similar with the linear curve of the Arrhenius equation at 25, 30 and 40 °C. However, the fitting curve, at 60, 80 and 100 °C, tended towards the outside of the curve in the form of Arrhenius equation. The ratio of endo/exo was a slight change from increase of the reaction temperature.