bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Dynamic Erosion Wear Behavior of HVOF Sprayed Nanostructured WC-12Co Coating
Authors: Liu Yan , Chen Hui , Gou Guo Qing , Tu Ming Jing
Published: March 2013

Erosion wear is an important failure mode existing in hydropowder, petroleum, chemical industry and other fields. Nanostructured WC-Co materials possess excellent erosion wear resistance due to their outstanding combination of high hardness and excellent fracture toughness. Nanostructured WC-12Co coating was prepared by means of High Velocity Oxygen Fuel (HVOF) spraying technology in this research. The simulating experiment system was developed to study the erosion wear properties. The corundum sand with main composition of Al2O3 was used to investigate the dynamic erosion properties of nanostructured WC-12Co coating. The dynamic failure mechanism of the coatings was also analyzed by Scanning Electron Microscope (SEM). The results show that the coating is worn layer by layer in the erosion test. The bonding between the layers and the thickness of the coating should be increased to elongate the coating life.
Topography and Wettability of Waterborne Polyurethane Coatings with Varying Amounts of Hard Segments
Authors: Qi Yu Hong , Zhang Zhan Ping , Zhang Yan , Miao Mei
Published: March 2013

Topography and wettability plays an important role to fouling release performance of a coating. Surface morphology and water contact angles (WCA) depending on time of three waterborne polyurethane (WPU) coatings were studied by laser scanning microscope and optical contact angle meter. The results show that WPU coatings with low hard segment content are consisted of hard segment domains, soft segment domains and crack-like non-cohesive regions. With increasing hard segment content, nanostructured micro-phase separated topography is easier to forming, and crack-like non-cohesive regions is reduced. A stable hydrophobic surface in the WPU system can be obtained by drying coating at 60C as well as adding hard segment content to improve fouling release performance of the coatings.
Structure and Properties of TiBCN Coatings Synthesized Using Unbalanced Magnetron Sputtering
Authors: Ho Wei Yu , Hsieh Ching Hui , Tsai Chia Hang , Lin Chien Liang , Hsu Cheng Hsun , Ho Woei Yun
Published: March 2013

TiBCN coatings were prepared by magnetron sputtering installed with two kinds of target materials (Ti and TiB2) in a mixed Ar, N2 and C2H2 ambient. The results showed that the TiBCN coatings could be successfully obtained by reactive sputtering with Ti and TiB2 dual targets. Raman spectroscopy indicated that TiBCN had similar spectra with DLC, which confirmed with high C content, in the wave range of 1000 ~ 2000 cm-1. The hardness of the coatings would decrease with an increase of N and the sp3 bond in the coatings. The friction coefficient against soda-lime glass ball was decreased from 1.3 of blank WC-Co substrate to 0.35 of the coatings in dry sliding condition.
Dynamic Study on Lime Carbonation
Authors: Cao Tong You
Published: March 2013

Through lab experiments and mathematical calculation of non¬¬-reaction nucleus model，dynamic study on lime carbonation has been carried out. The result revels that CO2 transfer is the limit step of lime carbonation reaction；its activation energy is about 83.15kJ／mol
Studying of the Grafting Modification on the PP Melt-Blown Non-Woven Fabric Used in Sewage Filtration
Authors: Cui Xiao Ping
Published: March 2013

The grafting copolymerization was studied for improving the filtration efficiency of the PP melt-blown non-woven. The experiment was made of three steps: firstly, the optimum conditions were attained by the orthogonal experiments; secondly, the effect regularities of main factors on reaction were discussed; thirdly, the water absorbability and the structure of the grafted sample were analyzed. The results show that the water absorbability of the grafted product significantly improves.
Removal of Boron from Metallurgical Grade Silicon by Chloride Molten Salt
Authors: Jia Bin Jie , Wu Ji Jun , Ma Wen Hui , Li Yan Long
Published: March 2013

Removal of boron is one of the greatest barriers in the process of upgrading metallurgical grade silicon (MG-Si) to solar grade silicon (SoG-Si). In this work, a chloride molten salt was used as a new refining reagent for removal of boron from MG-Si. The theoretical supporting for chloride molten salt refining was studied by the thermodynamic analysis at first, which testified that boron could be volatilized and removed from MG-Si melt by generating the gaseous boron chloride species. Then the experiments for the removal of boron were carried out using the chloride molten salt with the different conditions of refining time and the ratio of chloride molten salt to MG-Si. The results showed that the boron content in refined silicon was successfully reduced from 22.0×10-6 to 3.0×10-6 in a medium frequency induction furnace at 1695 K for 2h.
Study on the Kinetic Models of the Combustion in Sintering Process
Authors: Wang Jing Fu , Wang Ying , Wang Yin Zhi
Published: March 2013

The thermodynamics and dynamics characteristics of solid fuel combustion in sintering mixture were investigated in this paper. The combustion behavior of solid fuel in mixture was analyzed by thermogravimetric experiment, the solid fuel conversion with different fuel size and oxygen concentration was got by the experiment, the dynamic parameters: activation energy E and the pre-exponential A were theoretically calculated based on reaction kinetics model. The size and oxygen concentration were also the influence factors of combustion rate. The empirical data can be used to guide the simulation of actual sintering process and the dynamic parameters can be used in the establishment of the sintering model.
Study on the Behavior of SiO2 Related Phases in the Vanadium Slag
Authors: Ge Wen Sun , Chen Lian , Li Long , Li Qian Wen , Huang Zheng Hua
Published: March 2013

The SiO2 related phases in the vanadium slag exist in form of orthosilicate matter, the first solidified vanadium-containing phases would be surrounded or wrapped by the last solidified orthosilicate. So the wrapped orthosilicate have to be broken to achieve the extraction of vanadium from vanadium slag, therefore, to study the characteristics of SiO2 related phases in the vanadium slag will offer a practical guidance to understand the phase change of vanadium slag, The free SiO2 phase isn’t generated in the process of vanadium slag production in this paper by means of combination of vanadium slag compositions, petrographic analysis, Scanning electron microscopy -energy spectrum analysis (SEM-EDS) with the phase diagram of MgO-SiO2-FeO-CaO pseudo-ternary system calculated by Factsage, and SiO2 is mostly present in the olivine and pyroxene minerals.
Regularity of Nitrogen Macrosegregation in High Nitrogen Steel
Authors: Wang Shu Huan , Wu Yan Hui , Zhao Ding Guo , Chen Long
Published: March 2013

We studied the nitrogen macrosegregation of the HNS, and found that there were severe vertical segregation and horizontal segregation. Both of them are normal segregation. The study shown that the overflow area of nitrogen bubbles in the process of solidification is due to the nitrogen macrosegregation.
The Experimental Study on Performance of the High-Content Slag Cementitious Materials
Authors: Yang Ping , Qin Zhi Gui , Zhao Wei Xia , Cai Xi Nan , Yuang Xiao Lin
Published: March 2013

The research adopts the raw material of 89% slag with the composite activators and the compressive strength, hydration heat, temperature and expansion property of the material are studied. And the new cementitious material is obtained with the properties of low-heat and small expansion, convenience-confect, easy-operation and need no mass production. This material has the remarkable economic profit and good application foreground especially in the mass grouting engineering.
Research of Flow Simulation with High-Pressure and Bottom-Blowing Nitrogen
Authors: Wang Shu Huan , Zhang He Jun , Zhao Ding Guo
Published: March 2013

According to the actual situation of refining high nitrogen steel with the laboratory high pressure reaction axe, the molten steel flow field in the high-pressure and bottom-blowing nitrogen reactor was simulated by using the software Fluent. The rules of the influence of pressure factor on the molten steel flow field characteristics, turbulent kinetic energy and gas content were explored. According to the characteristics of the flow field and gas-liquid two phase structure, the rules of the influence of pressure factor on nitrogen concentration distribution were analyzed. So some useful theoretical basis and guidance were provided for laboratory refining high nitrogen steel and industrial production in the future.
Effects of SiO2 and Al2O3 Contents of Converter Slag on its Sticking to MgO-C Brick
Authors: Li Long , Zhang Da De , Zeng Jian Hua , Chen Yong
Published: March 2013

Using ladle slag, ferrovanadium smelting slag as well as slagging materials as starting materials, the converter slags with SiO2 contents of 11.3% to 2.6%, Al2O3 contents of 3.3% to 19.1% were prepared and some cylinder-shaped MgO-C samples were processed to fulfill slag sticking tests conducted at 1600°C in atmosphere furnace. The research results show that the amount of slag adhesion decreases with a reduction of SiO2 content and an increase of Al2O3 content in slag, owing to larger viscosity and higher foam index of molten slag. To control the variations of SiO2 and Al2O3 contents in converter slag is conducive to better slag splashing. Furthermore, the mechanism of SiO2 and Al2O3 contents of converter slag impacted on slag sticking to MgO-C brick has been further discussed.
Melting Properties of Preparing Compound Desulphurizer by Aluminothermy Reducing Caustic Calcined Dolomite
Authors: Wang Shi Jun , Zhang Xue Sen , Zhou Chang Cheng , Li Jie , Pan Jun
Published: March 2013

Taken caustic calcined dolomite based compound desulfurizer as the research object, influence of fluxing agent CaF2, Al2O3, SiO2 and heating agent on the melting temperature of the compound desulfurizer was mainly investigated during its directly reducing process. Fluxing agent SiO2 and heating agent are the main influence factors, which influence melting temperature of the compound desulfurizer, the next are CaF2 and Al2O3. The mean value of compound desulfurizer melting temperature is respectively 1190.3°C and 1199Subscript text.1°C when the addition amount of SiO2 and heating agent is respectively 8.33% and 33.55%. With the increase of CaF2, the mean value of compound desulfurizer melting temperature decreases gradually, however, which increases first and then decreases with the increase of Al2O3.The conditions of the lowest melting temperature about the compound desulfurizer is A4, B1, C1, D2, namely 9% CaF2 + 0% Al2O3 + 8.33% SiO2 + 33.55% heating agent.
Prediction of Oxygen Consumption of BF in Iron & Steel Factories Based on Least Squares Support Vector Machine
Authors: Wu Pei Lin , Wang Jian Jun , Li Hong Juan , Wang Hua
Published: March 2013

In this paper, we presented a prediction model of oxygen consumption of blast furnace (BF) based on least squares support vector machine (LSSVM) with the production data of an iron and steel factory. This method utilizes data pre-processing and parameters optimization to improve the fitting precision and operation speed of the model. By comparing the prediction results using different models with actual production data, we found out that the modified regression model of LSSVM is more suitable to predict the trend of oxygen consumption than others. The prediction accuracy is satisfactory and is helpful for oxygen system dispatch and production practice.
Research on Balling Properties of Pyrite Cinder with High Content of Copper
Authors: Bai Shao Jun , Wen Shu Ming , Ding Yuehua , Cao Qin Bo , Liu Dian Wen
Published: March 2013

The balling properties of pyrite cinder (PyC) with high content of copper are researched in this paper. The results indicate that grinding process is an effective way to improve the quality of green balls. Through the measuring of drop strength compressive strength and cracking temperature on pyrite cinder balls, it is found that the best bailing properties of PyC can be obtained under the recommended parameters (the content of grain size of PyC below 75 μm accounts to 95.75% and bentonite dosage is a mass ratio of 2%) and green balls with 5.4 frequency•(0.5m)-1 of drop strength, 15.8 N•each-1 of compressive strength and cracking temperature of about 700 °C are obtained, which can meet the requirements of metallurgical technology.
The Recycling Spent Catalyst of Furfural Hydrogenation with Pressure Sulphuric Acid Leaching
Authors: Li Zeng Xin , Wang Guo Ming , Han Tong Zhu
Published: March 2013

A new recycle technology of spent catalyst from furfuryl alcohol production by furfural hydrogenation has been developed. The approach is a process of dissolution in sulphuric acid under high temperature and high pressure condition. After removing the organic species, the spent catalyst of furfural hydrogenation was mixed with sulphuric acid, and reacted for 1h, 2h, 3h, 4h and 5h at 120°C, 140°C, 160°C, 180°C and 200°C, respectively. The content of copper in filtrate was analyzed by iodimetry. Effects of important variables, such as sulphuric acid concentration, reaction time and temperature, etc., were investigated for determining the optimum conditions. The optimum conditions of maximum leaching rate of spent cupric and chromic catalysts were determined by orthogonal experiment as follows: 80% sulphuric acid, reaction temperature 190°C and reaction time 4h. Under these conditions, the recycling rate of spent cupric and chromic catalysts was more than 93%.
Research on the Gold Ore Leaching in Iodine-Iodide System
Authors: Luo Xian Ping , Hu Min , Liang Chang Li , Ge Qing Hai
Published: March 2013

Iodine-iodide leaching gold ore is a promising method alternative to cyanide leaching. In this paper, Eh—pH diagram of Au-I--I2-H2O system was established through calculating the equilibrium potentials of the main chemical reactions based on the thermodynamic data of the actual iodide leaching of gold system. Gold ore leaching experiments in iodine-iodide system under different influence factors were carried out to verify the effectiveness of the Eh-pH diagram. The results indicated the diagram of Eh-pH can effectively guide the actual gold ore leaching in iodine-iodide system.
Treatment of Industrial Dimethylamine Wastewater in a Distillation Tower at Lab Scale
Authors: Chang Qiu Lian
Published: March 2013

One of difficult pollution control tasks for leather plants is the dimethylamine wastewater treatment. It is identified that there are two serious problems occurring in the current treatment process: low removal efficiency and low recycle efficiency. To solve these problems, new-type high efficiency packing and wastewater treatment process are proposed. The rectifying conditions of dimethylamine wastewater were investigated in a laboratory continuous distillation tower. Dimethylamine distillation efficiencies of no less than 47% at the top of tower was obtained, when the bottom temperature was controlled between 105～106°C, reflux ratio between 2～3, Final concentrations of less than 50 mg•L-1 at the bottom was obtained.
Comparison of the Methods for Calculating Instant Depth of Cut
Authors: Sun Yong , Li X.S.
Published: March 2013

When cutting rocks using mechanical excavators, the depth of cut (DOC) of cutting picks is a major factor that affects the forces on the picks and the drum on which the picks are installed. To optimize the design of the picks and the drum, as well as the operation of the continuous mining machine, it is necessary to analyze the DOC of individual picks accurately. In a cutting cycle, different picks can be in various positions and consequently have diverse DOCs which are termed the instant DOCs at the corresponding positions. In this study, it is aimed to investigate both accurate solution and approximate formula for the calculation of instant DOC. Based on theoretical analysis, the equations for the calculation of instant DOC have been developed, and the quantitative comparisons between the different DOC calculation methods have been made. The influence of the advance speed per revolution of the drum on the instant DOC, the cut interactions between picks and the cutting sections of individual picks have also been investigated. The results can assist in the selection of an appropriate DOC calculation method and improvement of drum design and operation.
Differential Flotation of a Pb-Zn-CaF2 Ore in Yunnan Province, China
Authors: Liu Si Qing , Wang Wan Ping , Li Xiu Juan , Zhang Min
Published: March 2013

A representative Pb-Zn-CaF2 ore sample subjected to this experimental study was taken from Niujie lead-zinc complex, Honghe municipality, Yunnan province, China. The ore sample assays 2.49% Pb, 1.05% Zn, 43.20% CaF2 and 136g/t Ag. In this paper, process mineralogy, Pb-Zn minerals separation and fluorite flotation were investigated, and the optimum reagent dosages for the differential flotation were determined. Three concentrates can be obtained, i.e., the lead and zinc concentrates containing 71.10% Pb (3389.65g/t Ag) and 50.06% Zn (301.23g/t Ag) at the recoveries of 89.02% and 84.20%, respectively; and a fluorite concentrate assaying 97.22% CaF2 with 93.76% recovery. Total Ag recovery in lead and zinc concentrates is as high as 91.55%.
Effect of Different Surfactant on Leaching of Uranium in Sandstone Type Ores with Low Permeability
Authors: Cai Gui Long , Tan Kai Xuan , Wang Wei Guang
Published: March 2013

This paper researched the effect of six surfactant including aodium dodecyl benzene sulfonate(SDBS)、cetyltrimethyl ammonium bromide(CTAB)、po1yoxyethylene octylphenol ether (OP-10)、Triton X-100(TX-100)、FSO and their mixture on surface tension of the leaching solution and on leaching rate of uranium in sandstone uranium ores. Results showed that all kinds of surfactant could observably reduce the surface tension of the leaching solution at low concentration. The surface tension of leaching solution containing 1g/L FSO and 0.01g/L mixture surfactant(mOP-10 /mFSO; 7:3) was 20.7mN/m and 17.9 mN/m respectively. Results of agitation leach experiments showed that FSO and the system of OP-10 and FSO could improve the leaching rate, and the leaching rate of uranium could be increased by 14.16% and 16.08% to 92.54% and 94.09% respectively. These results indicated that the way of reducing the surface tension of the leaching solution could improve the leaching rate of uranium.
Effect of Rod Arrangement in Matrix on High Gradient Magnetic Separation Performance
Authors: Chen Lu Zheng , Xu Guo Dong , Wen Shu Ming , Liu Si Qing , Gao Li Kun
Published: March 2013

The effect of rod arrangement in a rod matrix on high gradient magnetic separation (HGMS) performance has been comparatively investigated through a cyclic pilot-scale centrifugal HGMS separator, with contiguously and orthogonally arranged rod matrixes respectively. The results of investigation indicate that the arrangement of rod elements in the matrix has a distinct effect on the HGMS performance, for relatively low magnetic inductions; beyond the threshold magnetic induction, the magnetic induction dominates that of the arrangement and the importance of the arrangement is significantly weakened even vanished. It was thus concluded that the combinatorial optimization for magnetic elements in the matrix improves the collision efficiency of particles with matrix, and gives a superior performance in a HGMS separator, at a lower energizing consumption.
Flotation of a Copper-Lead Sulfide-Oxide Ore：Using a Combined Depressant for Galena and an Effective Activator D2 for Copper Oxide Minerals
Authors: Liu Mei Hua , Liang Yi Qiang , Jian Sheng , Zhang Xu Dong
Published: March 2013

The properties of a Cu-Pb oxide ore are investigated by XRD and SEM. Results show that the ore is characterized by chalcocite, galena, azurite and cerusite. Copper and lead phases analysis show that the oxidation rates of copper and lead are up to 70% and 72%, respectively. In order to get a good flotation performance for the difficult-to-treat ore, an efficient flotation technology of bulk flotation of Cu-Pb sulfides，separation of Cu-Pb sulfides, copper and lead oxides flotation has been developed. By applying the combined depressants (sodium thiosulfate + peroxide), activator Disulhydroxybenzen Thiodiazole (developed by Kunming Metallurgy Research Institute) in copper oxide flotation and sodium sulfide in flotation of lead oxide, chalcocite and galena can be separated and the Cu-Pb oxides can be activated. Results in closed circuit test show that when the feed assays 0.59% Cu, 2.40% Pb and 39.87 g/t Ag, marketable copper sulfide and oxide concentrates, lead sulfide and oxide concentrates can be obtained. At the same time, silver got enriched in the concentrates too. This study is expected to give a technical support in utilizing this complex Cu-Pb oxide ores.
Geochemical Characteristics and Ore Prediction of the Pb-Zn Polymetallic District in Kanmashan of Lancang County, Yunnan
Authors: Chen Nan , Li Ying Shu , Chen Jiao Jiao , Wang Lun , Zhang Yi Ke , He Da Qing
Published: March 2013

According to the analysis of geological characteristics and Elemental correlation charac –teristics, Threshold and R-factor analysis leading to the results geochemistry characteristics of Kanmashan Pb-Zn polymetallic deposit which is located in Lancang county of Yunnan province, the deposit is discovered in the southern arc of Chong mountain-lincang-menghai mountain, alonging the contact strip of Lincang granitoid batholith and proterozoic group in LanCang, metallogenic conditions near fracture is relatively ideal, which can be used as a further work area.
Mechanism Research on Niobium Distribution Influenced by Roasting Temperature in the Direct Reduction Roasting Process
Authors: Jiang Man , Sun Ti Chang , Liu Na , Kou Jue , Ji Ya Na , Xu Yan , Wei Yu Xia
Published: March 2013

In this study, the niobium enrichment research of the iron concentrate containing niobium was studied by coal-based direct reduction roasting followed by magnetic separation process. The distribution of niobium element and existence form of mineral bearing-Nb in roasted products were investigated under different roasting temperature which was ranging from 1100°C to 1300°C. X-ray diffraction analysis (XRD) was used to identify the various minerals and compositions of the roasted products. The microstructures of these products were analyzed by the scanning electron microscope (SEM), while the elemental analysis was carried out by using energy dispersive spectrometer (EDS) technique. The results of XRD and EDS analysis showed that most of the niobium minerals were Nb-Fe rutile and ulvospinel which scattered in slag, and only a little was adhered to the surface of metallic iron at 1100°C. And the niobium oxides were partly reduced to Ti-aeschynite and niobocarbide which attached on the surface of metallic iron, and most were still ulvospinel scattering in the slag at 1200°C. The Ti-aeschynite was gradually reduced to Nb adhering to the metallic iron particle forming Nb-Fe soild solution at 1300°C.
Recovery of Iron from Tailings of Yangla Copper Ore by Magnetic Separation
Authors: Chen Ci Yun , Wen Shu Ming , Xian Yong Jun , Feng Qi Cheng , Zhao He Fei
Published: March 2013

Against the dwindling status of mineral resources at present, effective recycling of tailings resources is an effective way to alleviate the shortage of resources, and to improve enterprise efficiency. This study was aimed to recover iron from tailings of Yangla copper ore, Fe content of which was 15.31%, and the content of strong magnetic iron mineral was about 11%. Considering low content of weak magnetic iron mineral and its complex and costly recovery process, weak magnetic iron mineral did not be recovered, so strong magnetic iron mineral was only recovered in this study. Under no grinding condition, Fe recovery of 6.47% with iron grade of 60.87% was obtained. It effectively recovered strong magnetic minerals from tailings, and got enterprise increase additional revenue with good economic benefits.
Recovery of Molybdenum from Molybdenum Ore with a High Content of Carbon by Separating Carbon from Sulfur
Authors: Feng Qi Cheng , Wen Shu Ming , Zhao Wen Juan , Chen Ci Yun , Zhao He Fei
Published: March 2013

The study was aimed to recover molybdenum minerals from molybdenum ore with a high content of carbon by flotation process. The material belonged to a kind of refractory molybdenum ore from which molybdenum minerals could not be extracted effectively using traditional beneficiation and metallurgy, because of their similar floatability between carbon minerals and molybdenite and complex intergrowth. Based on the research on the properties of the material and lots of experiments, the carbon-molybdenum bulk flotation experiment was firstly carried out to concentrate molybdenum, and then some potassium permanganate and lime were added in carbon-molybdenum bulk flotation products to inhibit sulfide minerals along with appropriate air agitation. Under such a condition, the floatability of sulfide minerals was weakened and carbon was separated from sulfur. Then carbon concentrate and sulfur concentrate were used to extract molybdenum through metallurgy respectively.
Study on Failure Process Deterioration and its Amelioration of Mine Ventilation System
Authors: Wang Hong De
Published: March 2013

Mine ventilation system is a repairable system, with the characters of time-varied and randomness. It made us encounter some difficulties when we discussed the system failure evolution process and its operational reliability, as well as when we sought the system reliability parameters developing trends following with ventilation system operation time variation and air adjustment. Firstly, according to the reliability theory, the failure process characteristic values, which affect the ventilation system, were defined. And then, by mean of the analysis of the failure process deterioration of mine ventilation system, the deterioration and its amelioration discriminants are given basing on two parameters’ Weibull process. Finally, on the basis of adaptive neural network technology, the ventilation system failure processes were simulated, the failure process characteristic parameters were determined, and the failure curves were drawn accordingly. The results show that the failure process of the experiment mine ventilation system is a Non-homogeneous Poisson Process; the mean time between failures of the ventilation system is between 160h and 170h; the failure ratio curves present the trends of concave or convex variation when the system failure process deterioration or amelioration.
Supercritical CO2 Fluid Leaching of Uranium from Sandstone Type Ores
Authors: Wang Wei Guang , Tan Kai Xuan , Xie Er Ju , Liu Jiang , Cai Gui Long
Published: March 2013

Uranium is an important fuel for nuclear power, so the mining and milling of uranium is the base for development of nuclear power. Our experiments study is about the supercritical CO2 fluid extraction of uranium in low grade uranium ore, and the influence of aqueous medium, oxidants, chelating agents and other factors on the uranium leaching. In aqueous media, Fe2 (SO4)3 as the oxidants, supercritical CO2 fluid extraction of uranium has the best effect, the uranium leaching rate reaches 90.44%, significantly higher than that of the conventional acid and alkaline leaching. In the process of extraction of uranium in supercritical CO2 fluid, the uranium in uranium ore is first oxidized to hexavalent uranium, and then forms high solubility of uranyl carbonate complexes. Supercritical CO2 fluid is expected to be used in in-situ leaching of uranium mining of the low grade sandstone uranium deposits.
The Effect of Zinc Oxide Flotation Using Dodecylamine
Authors: Wu Dan Dan , Wen Shu Ming , Yang Jing , Deng Jiu Shuai , Liu Jian
Published: March 2013

In this study, the influences of important factors on zinc oxide flotation are investigated. Dosages of sulphidizing reagent, the pH regulator, the activator and the collector, use of sodium sulfide as the sulphidizing reagent, sodium carbonate as the pH regulator, copper sulfate as the activator and dodecylamine as the collector are essential to the effective recovery of zinc oxide. In the closed circuit experiment, these agents showed promising effect, a zinc concentrate with 15.39% Zn was produced with 76.92% recovery as a result of flotation experiment, and in the tailings with 18.56% Zn content.
Zircon SHRIMP Geochronology and Geochemistry of late Jurassic Volcanic Rocks in Huiyin Obo Area, Inner Mongolia, China
Authors: Chen Ying Fu , Wang Gen Hou , Duan Xian Le
Published: March 2013

The primary object of this fundamental research is to reveal new study of Late Jurassic Manketou Obo Formation and Early Cretaceous Manitu Formation, Baiyingaolao Formation, in Huiyin Obo area, East Ujimqin County, Inner Mongolia. Several sets of experiments were carried out to test the validity of three formations’ age, and these forms can be contrasted with Chagannuoer Formation and Bulagehada Formation from “1/250000 Regional Geology Survey in Hesigewula Farm.” As a result of our study, we concluded that further research into the Mesozoic volcanic rocks on the Huiyin Obo is necessary.
Kinetics of Leaching Silicon from the Acid Leaching Residue of Pyrolusite
Authors: Su Hai Feng , Chen Chao , Lu Qing , Wen Yan Xuan , Su Jing
Published: March 2013

The content of SiO2 was more than 60% in the residue of pyrolusite detached manganese by reduction roasted and acid leached, and it was a better siliceous raw material because of less other impurities. Through leaching silicon process in the residue of pyrolusite with alkali at atmospheric pressure, leaching kinetics of silica in the sodium hydroxide solution was researched. The effects of the leaching temperature and the concentration of sodium hydroxide solution on the leaching behavior of silica from acid-leached pyrolusite slag were examinted. It was found that the extracting rate of silica is significantly influenced by the temperature, and the concentration of NaOH solution. The experimental datas were well interpreted with a shrinking core model under chemical control. On the basis of the Arrhenius expression the apparent activation energy of 77.69 kJ/mol and a reaction order of 0.34 for the extraction of silica was evaluated.
Application Analysis and Stress Sensitivity Experiment for a Gas Reservoir in Daqing Oil Field
Authors: Li Li , Zhou Gao Ning
Published: March 2013

By measuring the change of confining pressure penetration on sandstone samples of a gas reservoir in Daqing Oil Field, it has been proven that stress sensitivity existed in this gas reservoirs. The measuring results also show that the stress sensitivity levels of mafic is from weak to medium weak due to the better glutinosity and the greater rock hardness. However, some sandstone samples generally do not have stress sensitivity. The impact of stress sensitivity should be thoroughly considered during the development of natural gas, because the existence of cracks which often result in stronger stress sensitivity.
Strength Analysis of Transitional Segment of Buckling Tubing Nearby the Packer in Vertical Well
Authors: Zhang Shao Li , Wang Xin He , Xu Jiang Wen , Dou Yi Hua , Xia Hui
Published: March 2013

The buckling deformation and stress distribution of the tubing nearby the packer would be seriously influenced by the packer constraints. This paper focused on the Strength analysis of transitional segment. The method to calculate the buckling deformation and the equivalent stress of transitional segment were derived considering the tubing boundary and continuity condition, adopting the fourth-order nonlinear ordinary differential equations and helical buckling strength method. This study makes up for the weakness of traditional stress analysis of the buckling tubing nearby the packer in vertical well, improves the pertinence and accuracy of stress analysis of buckling tubing. The results of analysis show that with the axial pressure increasing lead to the length of the transitional segment irregular fluctuations and the maximum equivalent stress increasing. The equivalent stress would gradually reduce and finally approach a constant.
Study on Prediction Method of Oil and Gas Pipelines through Gob in Loess Gully Region
Authors: Zhao Bing Chao , Yu Xue Yi , Wang Jin Dong
Published: March 2013

Aim at gob in loess gully region is the only ways of West—East oil and gas pipeline, the risk assessment on oil and gas pipeline through gob is solve operation of pipelines, and prevent the occurrence of major disasters and urgently need to study and solve major problems. It combines with integral method to further risk assessment on oil and gas pipelines across god based on the results mining subsidence hazard study in loess gully region. The method has proved that has some guidance on risk assessment of oil and gas pipelines through the loess gully region, and it is for further study on overlying gob pipeline movement and deformation to lay the theoretical basis.
Modification Design by Replacing Perforated Shells Barrel Based with 406 Steel Based on Finite Element Analysis
Authors: Liu Sheng , Sheng Xuan Yu , Shang Yi Tong
Published: March 2013

Steel 406 is a high strength steel, generally used for military equipment. Finite element analysis software was used to comparatively analysis perforating gun between the original structure and modified structure. AUTODYNE software was used to compare the speed, total energy and kinetic energy of the two jet structure. It was proved that the use of 406 steel instead of high-strength material, decreasing the thickness of 6.75mm, the structural strength meets the requirements, the stability of the structure to meets the requirements. Jet speed and kinetic energy increases，while total energy reduce little. The maximum speed increases 5.9%. After replacing material, the weight of the guns was reduced, jet penetration depth increased, so the revised design was better.
Application of AHP-FUZZY in Analyzing and Evaluating Occupational Hazards of Rolling Enterprise
Authors: Yang Xiao Ni , Shang Xu Guang
Published: March 2013

In order to evaluate occupational hazards comprehensively in the rolling enterprise to provide an effective reference for their improvement, this paper identifies and analyzes the existing occupational risk factors of the rolling enterprise; modeling the occupational hazards of the fuzzy comprehensive evaluation; then studies the example on the basic principles of F-AHP (Fuzzy-Analytic Hierarchy Process). The noise, toxic gas, high temperature and dust are studied respectively and noise is the worst factor. The investigation indicates that F-AHP can be used in comprehensive evaluation of various hazards instead of evaluation based on the single index so as to ensure the results to be more comprehensive, more objective and more practical.
Adsorption of Fluorine from Aqueous Solution by Chitosan Magnetic Microspheres of Loading Lanthanum
Authors: Wang Jin Song , Fang Feng Rong , Yue Heng , Guo Qing Wei , Xu Zhen Cheng
Published: March 2013

The adsorption of fluoride by chitosan magnetic microspheres of loading lanthanum metal (CTS-La) was investigated in this study. The chitosan magnetic materials were prepared by organically-linking technique. The effects of pH, the reaction time, the initial concentration, dosage and temperature on the removal rate were studied to determine to the optimum operating parameters. The experimental results show that CTS-La is a black particle shape material with magnetism. The magnetic microspheres have high adsorption ability for fluoride, and the maximum removal of F- was 98.4% under the operating parameters of the initial fluoride concentration 10mg/L, pH=2-3,the reaction time 60minutes, dosage 0.1g, temperature 318K. . The equilibrium sorption data are fitted reasonably well in Langmuir and Freundlich isotherm model, and the correlation coefficients (R2) were Langmuir’s correlation and 0.9997 respectively.
Analysis and Related Preventive Measures of Explosion Risk Factors of LPG Rail Transport
Authors: Xiao Qin Jie , Zhu Zhi Dong , Mou Rui Fang
Published: March 2013

Railway transportation safety management must adhere to the approach of safety and prevention first. The transport of dangerous goods should be paid more attention as a particularly important part. This paper made use of fault tree analysis to research and analyze the risk factors of dangerous goods LPG which may explode in the rail transport. The analysis was made from two aspects of chemistry and physics, then the minimal cut sets and structure importance of the specific factors which may cause explosion accidents are solved, and the importance of each factor is analyzed and sorted on the calculated results. Based on the above method, measures of LPG rail transport explosion prevention were proposed.
Analysis of Mill Performance of Industrial Scale Ball Mill Using DEM Simulation
Authors: Li Hong Cheng , Dong Wei Min , Xie Xing Ping
Published: March 2013

The simulation of grinding process of an industrial scale ball mill was carried out using the discrete element method (DEM). Combining the information from DEM simulation and theoretical or empirical models, the related parameter values of mill performance are obtained, which have some reference value to the design, optimization and selection of ball mills.
Combination Model Based on CBR and SVM for BOF Oxygen Volume Calculation
Authors: Xing Jun , Peng Jian Jun , Yin Yan Hui
Published: March 2013

Oxygen blowing volume control is very important in Basic Oxygen Furnace (BOF) steelmaking. A combination model based on information theory and artificial intelligence technology is proposed for oxygen blowing volume calculation. The combination model is composed of Case-based Reasoning (CBR) model and Support Vector Machine (SVM) model. In CBR model, the mutual information is introduced in case retrieval step to determine the weights of attributes. In SVM model, the mutual information is adopt to distinguish the importance of input variables by setting a different weight to each variable. The CBR model is viewed as experience based model and the SVM model is viewed as data based model. To model the oxygen blowing volume accurately, CBR model and SVM model are combined. Tests on a 180 ton BOF data are implemented to validate the effectiveness of the proposed method.
Numerical Simulation of the Inner Flow Field and the Optimal Design of Hema-Type ATY Nozzle Based on Fluent
Authors: Zhang Min Hua , Zheng Hong Mei , Liu Cui , Qu Yin Hu , Liang Tao , Wang Feng , Liu Xin Feng , Wang Qiong
Published: March 2013

the inner flow fields of twelve Hema-type ATY nozzles which have different structure and parameters are simulated by the Fluent software, which is based on the CFD (Computational Fluid Dynamics) theory.Then the simulation results are analyzed，through wich the best designed nozzle is determined.
Study on Application Technology of Lightweight Model Oriented to No-Drawing Manufacturing
Authors: Yin Hai Jun , Ning Jun Yi , Han Zhi Ren
Published: March 2013

The application technology of lightweight model is a key issue in no-drawing manufacturing. Based on enterprise demand, the creation, use and management of lightweight model were studied. This paper presented the technology that lightweight model based on PDM system should be associated with the original design data, and the concrete requirements such as its size should be reduced more than one tenth by the premise of keeping consistent with geometric accuracy of the original model. This paper also put forward acquisition method, application range, file management, version management and status management of lightweight model. The contents can provide a reference for choosing creation software, making management regulation and application standard of lightweight model.
Numerical Simulation Research of Equivalent Strain in Every Pass of H-Beam in Cogging Beam Blank
Authors: Chen Lin , Wu Chen Xia , Bi Ke Xin
Published: March 2013

In order to guarantee organization and performance requirements of H-beam, a certain compression ratio is needed from stock to products. This paper choose blank special-shaped billet, using DEFORM finite element software, simulated and analyzed change rule of H-beam equivalent strain when beam blank is cogging. Simulation results show that:The compression ratio is 10.78 from stock to products. The stock dimension meet requirements of from A hole to CCS rolling after BD cogging. The equivalent strain rule during the entire process of beam blank cogging is mainly focus waist and haunch joint.
Robust H∞ Control of Time-Delay Systems
Authors: Sun Man
Published: March 2013

In this paper, a delay-dependent H_infinity performance criterion which possess decoupling structure is derived for a class of time-delay systems. It is then extended to H_infinity state-feedback synthesis for time-delay systems with polytopic uncertainty. All the conditions are given in terms of the linear matrix inequalities (LMIs). Numerical examples illustrate the effectiveness of our methods.
A Novel Approach to Identify Red Palm Weevil on Palms
Authors: Martin Betty , Juliet Vimala
Published: March 2013

Red Palm Weevil is a deadly pest on palms. It destroys thousands of palms every year by feeding on the soft tissues of palm trunk which are less than 15-20 years. The productivity decreases resulting in huge loss. There is no accurate or exact solution to destroy this infestation in the early stages. Hence there arises a technology to identify the presence of RPW along with its larva by sensing its sound. To achieve this task, we need to devise an acoustic sensor so that defected trees can be easily picked up and proper measures can be engaged to destroy the pest. This technology depends on the acoustic emissions from pests. Clustering is also done on input data recorded which gives similarity measures between two signals. The Euclidean distance for the least significant output with the database will match and help in identifying the insect species.
ECF Bleaching of Pre-Hydrolyzed Larix Kraft Pulp for Production of Dissolving Pulp
Authors: Li Zhi , Li Jun , Xu Jun
Published: March 2013

Elemental Chlorine Free (ECF) bleaching sequence of O1/O2D0EOPD1D2 was adopted to bleach the pro-hydrolyzed Larix kraft pulp, where O1/O2 was two-stage oxygen delignification without interstage treatment, D was chlorine dioxide bleaching, EOP was pressurized alkaline extraction strengthened by hydrogen peroxide. Keeping bleaching temperature and time unchanged, sodium hydroxide charge(NaOH) in O1 stage, chlorine dioxide(ClO2) charge in D0 stage and D2 stage were studied, pulp properties such as brightness, kappa number, alpha-cellulose, pentosan and polymerization degree were measured and compared to establish optimal bleaching conditions. Results show that the optimal charge of NaOH in O1 stage is 2.5%, ClO2 in D0 and D2 stage are 2.5%, 0.6%, and the pulp gained at the optimal bleaching conditions has the properties of 93.9% of alpha-cellulose, 2.60% of pentosan, 375.5 ml/g of viscosity and 86.6%ISO of brightness.
Structural Adjustment of Disciplines in Higher Learning Institutions from the Perspective of Dissipative Structure Theory
Authors: Wang Ying
Published: March 2013

This article first expounds the main content of dissipative structure theory and some general rules of its forming mechanism and conditions. With the help of this theory, this article discusses structural adjustment of disciplines and puts forward some measures of optimizing discipline structure.
Effects of Concentration of TiOSO4 and Fe/TiO2 Ratio on TiO2 Anatase White Pigment Production via Short Sulfate Process
Authors: Tian Cong Xue , Huang Shuang Hua , Yang Ying
Published: March 2013

Using unconcentrated TiOSO4 solution from sulfate process as titanium source, anatase TiO2 white pigment was prepared by self-generating seed thermal hydrolysis route via short sulfate process. The effects of concentration of TiOSO4 solution and Fe/TiO2 ratio on the structure and pigment properties of the TiO2 white pigments were investigated. The samples were characterized by XRD, particle size distribution and pigment properties test. The concentration of TiOSO4 solution and Fe/TiO2 ratio had great effects on the super-saturation of TiO2+, crystal formation, nucleation, crystallization and aggregation process, eventually determined the crystal structure, particle size distribution and its pigment properties. The optimized concentration of TiOSO4 solution was of 195 g/L, and the Fe/TiO2 ratio was at 0.30.The as-prepared anatase white pigment was appropriate particle size, narrow particle size distribution and good pigment properties.
Study on the Chemical Integrated and Designing Experiment Course of Undergraduate
Authors: Zhou Hong Li , Yu Lin Chao , Zhang Jian , Zhao Guo Liang , Qiu Sai Lian
Published: March 2013

According to the current situation of integrated and designing experiments in our college, experiments involving the extract, identification and determination of polysaccharides and flavonoids in corn silk were set as integrated training course for undergraduates. On the purpose of enhancing comprehensive experimental skills of the students, integrating the theories they learned in classes with practice, making students comprehending relevant knowledge of organic chemistry, analytical chemistry, natural pharmaceutical chemistry and pharmaceutical analysis, the sense of scientific innovation and changing waste into valuable was trained.
Fault Diagnosis of Metallurgical Machinery Based on Spectral Kurtosis and GA-SVM
Authors: Li Yun , Gao Yan , Guo Jun , Yu Xian Jun
Published: March 2013

This paper proposed a new method of rolling element bearing (REB) fault diagnosis for metallurgical machinery. Mainly it stresses on the combination of spectral kurtosis (SK) and supports vector machine (SVM), using genetic algorithm (GA) to optimize the parameters of support vector machine at the same time. Thus, this study aims to integrate SK, GA and SVM in order to develop an intelligent REB fault detector for metallurgical machineries. Simulation study indicates that this method can effectively detect the REB faults with a high accuracy.
Fractional Differential-Based Approach for CT Image Enhancement
Authors: Chen Da Li , Xue Ding Yu , Chen Yang Quan
Published: March 2013

In this paper, a fractional differential-based approach for CT image enhancement is introduced. This approach uses a group of fractional differential masks, which are generalized from the one-dimensional digital fractional order Savitzky-Golay differentiator, to process the image and a max-saturation strategy is designed to enhance these processed images. Some experiments are used to assess the performance of the proposed fractional differential-based image enhancing algorithm, and the results demonstrate that the proposed enhancing method is able to achieve a good tradeoff between the feature enhancement and texture preservation.
The Preprocessing Method for Software Reliability Failure Data
Authors: Li Qiu Ying , Zhang Hui Qi
Published: March 2013

The software reliability failure data is the foundation of the software reliability’s quantitative evaluation based on the failure data, and it has an important influence on the accuracy of reliability evaluation. But there are always noises in the original software reliability failure data and make the reliability evaluation accuracy affected. This paper put forward the collecting method of reliability failure data and data preprocessing method including data cleaning and data analysis method, which based on the analysis of the importance and the source of failure data in the software reliability testing and the classification of software failure data. Finally through an example, it displayed the reduction of data noises and the promotion of data quality which produced by the preprocessing methods.