Please select the most similar patent number from A, B, C and D. Which number is?
The present invention relates to the technical field of deep processing and comprehensive utilization of waste mineral oil sludge, in particular to a method and a system for recycling waste mineral oil sludge. The system comprises a filtering unit, a dechlorination unit, a tubular reaction unit, a retarding pyrolysis unit, a fractionation unit and a hydrofining unit. The present invention can not only solve the problem of deep processing and utilization of waste mineral oil sludge, save the environmental protection costs by deep processing and utilization of the sludge, but also obtain certain high additional value products and increase economic benefits. Moreover, a good raw material can be provided for a hydrofining reactor, and the lubricating oil recovery rate of the whole process of a waste mineral oil regeneration device is improved. Moreover, the process has the characteristics of high yield, less ash and carbon deposit, not easy to coke in a pipeline and easy continuous operation.
A: Disclosed is a method for hazard-free treatment of a sludge from a spent solution of mixed acids after acid washing of stainless steel, comprising the following steps: 1) feeding a spent acid washing solution to a precipitation unit and performing a precipitation treatment, whereby a sludge is formed at the bottom of the precipitation unit from the spent solution of mixed acids; 2) filtering the sludge from the spent solution of mixed acids and feeding the sludge to a sludge storage unit and performing blending, mixing, and homogenization; 3) spraying the homogenized sludge into a calcination furnace to allow chemical reactions to occur, generating solid metal oxides, HF gas, and HNO 3  gas; and 4) discharging the solid metal oxides falling to the bottom of the calcination furnace by using a scraping rake, and allowing the HF gas and HNO 3  gas to exit the top of the calcination furnace, pass through a preconcentrator, and enter an absorption tower to undergo acid regeneration. The present invention can reduce the production of acidic sludge and decrease the treatment cost borne by a metallurgical enterprise. Moreover, the present invention allows reclamation of acidic sludge having a high economic value by increasing the recovery rate of F -  and NO 3 
 - , recovering abundant amounts of high-value metal ions, such as nickel, chromium, titanium, and molybdenum in the acidic sludge, and forming solid metal oxides having a high added value.
B: A comprehensive processing method and comprehensive processing system for copper-containing sludge and circuit boards, the comprehensive processing method comprising: mixing and granulating copper-containing sludge and waste-activated carbon to obtain copper-containing sludge particles; performing side blowing smelting on the copper-containing sludge particles and a circuit board. The waste-activated carbon is used as a reducing agent and a partial combustion agent, which is mixed and granulated with the copper-containing sludge and then side blowing smelted with the circuit board; in addition, a waste mineral oil is used as a supplementary fuel, thereby further reducing the energy consumption costs of side blowing smelting; during the process of side blowing smelting, organic matter of the circuit board burns to generate heat, and the organic matter may be used as a fuel for side blowing smelting, thereby completing the separation of copper and other impurities from the copper-containing sludge and the circuit board, fully utilizing the heat energy of the organic matter in the circuit board, and further reducing the energy consumption costs of side blowing smelting.
C: Disclosed is a process for producing mesophase pitch by hydrogenation of high-temperature coal tar, comprising removing salts and quinoline insolubles from the high-temperature coal tar to obtain a clear oil; using the clear oil as a hydrogenation feed oil, or pre-distilling the clear oil to obtain a bottom component with a boiling point higher than 230°C and formulating the bottom component into a hydrogenation feed oil; refining the hydrogenation feed oil by catalytic hydrogenation to obtain a refined hydrogenated oil; distilling the refined hydrogenated oil to obtain hydrogenated pitch; subjecting the hydrogenated pitch to thermal condensation polymerisation to obtain the mesophase pitch. The process has features such as an easily controllable degree of hydrogenation, complete removal of impurities, good raw material flowability, not being susceptible to carbon deposition and coking during the process, and not tending to block the reactor. The product has a high mesophase content, a low softening point and a low impurity content.
D: A diesel oil and jet fuel production system and method utilizing Fischer-Tropsch synthetic oil. The method comprises two parts, hydrofining and hydro-upgrading, and comprises the following steps: mixing a Fischer-Tropsch synthetic oil with hydrogen and introducing the same into a hydrofining reactor (A), and introducing a product thereof into a first fractionating tower (C); taking a cut naphtha fraction as an ethylene cracking raw material, and introducing a diesel fraction into a hydroisomerization reactor (E); introducing an unconverted oil into a hydrocracking reactor (D), mixing the products of the two reactors and then introducing the mixed products into a second fractionating tower (F) to obtain a jet fuel and diesel oil product, and circulating the unconverted oil to the hydrocracking reactor (D). The method can produce diesel oil, jet fuel and a hydrotreating wax oil product, has a simple technique, a stable process, low equipment investment, low costs, a long running period, and a high yield of diesel oil and jet fuel which can directly serve as fuel or blending components.
Answer: A