A comprehensive recovery and treatment process of electrolytic manganese anode slime

Abstract

The present invention discloses a comprehensive recovery treatment process for electrolytic manganese anode slime, which comprises the following steps: (1) adding the electrolytic manganese anode slime into a leaching tank, then adding an electrolytic manganese anode solution into the leaching tank and starting stirring; (2) feeding a leaching agent containing SO2 into the leaching tank for a leaching reaction; (3) carrying out solid-solution separation after ending of the leaching reaction to obtain a solution containing manganese sulfate and lead-rich slag, and directly incorporating the obtained solution containing the manganese sulfate into the electromagnetic manganese anode solution of an electromagnetic manganese production line without purification and impurity removal. The comprehensive recovery treatment process for electrolytic manganese anode slime is simple in operation, low in cost, and capable of effectively increasing the yield of the metal, and has favorable industrial application prospect.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a comprehensive recovery and treatment process of electrolytic manganese anode slime. Background technique [0002] With the rapid development of my country's iron and steel industry and the increase in the output of manganese products, the production capacity of electrolytic manganese has increased significantly. By the end of 2015, the production capacity of electrolytic manganese had exceeded 2 million tons per year. In the production process of electrolytic manganese metal, a large amount of anode slime with high manganese content is inevitably produced in the anode area of ​​the electrolytic cell, and 0.05-0.08 tons of anode slime will be produced for every ton of electrolytic manganese produced. However, because of its complex composition and structure, and containing more heavy metals such as lead, it is generally stored as dangerous waste residue, steelmaking additives...

AI Technical Summary

Problems solved by technology

However, because of its complex composition and structure, and containing more heavy metals such as lead, it is generally stored as dangerous waste residue, steelmaking additives or sold at a low price, and has not been rationally utilized. cause considerable environmental pollution

Due to the difficulty in handling anode slime, the sales price is relatively low. Although the grade of manganese is high, the price per ton is lower than that of manganese carbonate and pyrolusite for a long time

[0003] At present, there are three main types of treatment methods for electrolytic manganese anode slime: the first category is to directly process electrolytic manganese anode slime to prepare chemical manganese dioxide. performance chemical manganese dioxide products, but because the anode slime contains a certain amount of lead, although it does not affect its discharge performance, it will cause environmental pollution and does not meet the current use standards; the second category is to reduce the anode by high temperature reduction method Mn in mud 4+ reduced to Mn 2+ , and then through acid leaching, manganese enters the solution in the form of ions. The reducing agents used mainly include charcoal, bituminous coal and other reducing agents. Since the electrolytic manganese anode slime contains a certain amount of lead and a small amount of selenium and other low-melting toxic metals , during the high temperature treatment process, it is easy to cause the volatilization of toxic metals, resulting in secondary pollution to the environment; the third type is to use wet reduction, such as using sulfurous acid, pyrite, glucose and cellulose to electrolytic manganese anode Generally, the anode slime and reducing agent are added to the water for stirring reaction, so that the tetravalent manganese in the anode slime is converted into divalent manganese, and then enters the solution, and then undergoes purification, impurity removal, crystallization and other processes to obtain high-quality manganese. pure manganese salt

However, since the reducing agent added in this type of process usually introduces impurities, an additional purification and removal process is required, and the additional crystallization process also increases the application cost; in addition, the use of aqueous solution as the leaching solution will cause system expansion for the entire electrolytic manganese production question

At present, most of these processes are only designed and studied as a single process, and their connection with the application of electrolytic manganese is not fully considered.

Therefore, the application of such methods in the field of electrolytic manganese mostly stays in the laboratory research stage, and there is no report of industrial application

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