Method for extracting cobalt and copper from cobalt-copper-iron alloy

Abstract

The invention discloses a method for extracting cobalt and copper from cobalt-copper-iron alloy, and relates to a method for preparing electrical copper and high-purity cobalt salt from high-silicon cobalt-copper-iron alloy serving as a raw material. The method is characterized by comprising the following steps of: (1) levigating the alloy; (2) performing acid leaching on the levigated alloy under the conditions of heating, pressurizing and introducing oxygen; (3) filtering leached ore pulp, and washing leached residue; and (4) recovering copper from leachate by adopting an extraction-electrodeposition process, removing impurities from copper raffinate, and extracting the cobalt and nickel. The method has the advantages that: the pressure leaching is low in temperature, the consumption of a reagent is low, the selectivity is high, the leaching rate of valuable metals is high, most iron is inhibited in the residue, the leached ore pulp has high filter performance, the harmful impurity of silicon is totally solidified in the iron residue, and the method is an environment-friendly process which is easy to implement.

Description

technical field [0001] The invention discloses a method for extracting cobalt and copper from a cobalt-copper-iron alloy, and relates to a production method for preparing electric copper and high-purity cobalt salt using a high-silicon cobalt-copper-iron alloy as a raw material. Background technique [0002] my country is a country that lacks cobalt resources. About 90% of the cobalt raw materials required for production depend on foreign imports, most of which come from Zambia and Congo (Kinshasa). In recent years, my country's cobalt production has grown rapidly, and it is expected that the shortage of domestic cobalt concentrates will be difficult to change in the short term. At the same time, in March 2007, the Congo formulated a policy of restricting exports, prohibiting the export of raw ore, and only allowing local processing into primary smelted metal products (intermediate products of cobalt smelting or cobalt platinum) to be exported. my country relies heavily on i...

AI Technical Summary

Problems solved by technology

However, in the final direct acid leaching or oxidative acid leaching process, since iron is also leached while leaching cobalt, the consumption of acid is increased, and the problem of consuming a large amount of alkali for iron removal has not been effectively solved.

[0006] Foshan Bangpu Nickel Cobalt Co., Ltd. and Tsinghua University jointly developed the patent 101463427 "A method for recovering valuable metals from cobalt white alloy", which uses "chlorine gas oxidative acid leaching method" to treat the alloy, Wang Hanyuan et al. 1997 Mining and Metallurgy Journal Similar articles have been published, but chlorine gas is a highly toxic gas with a high risk factor, so the requirements for equipment are also very high. This is the main reason why this technology has not been applied in industry so far. Its leaching speed is slow, and the problem of the acid consumed by iron dissolution in the leaching process and the consumption of a large amount of alkali in the subsequent solution for iron removal has not been solved in the subsequent treatment.

[0007] The above method will greatly reduce the leaching effect for the treatment of silicon-containing materials, especially materials containing more than 6% silicon, and the solid-liquid separation of the solution is relatively difficult

The patent 200910306801.X "cobalt-copper alloy leaching method" developed by Peng Guowei uses fluorine additives and organic acids for leaching. The leaching process is operated under normal pressure and the temperature is below 100°C, but fluorine reagents are added to the acidic solution , it is more difficult to deal with the corrosion of equipment, fluorine-containing waste water and fluorine-containing waste residue generated by subsequent leaching

At the same time, a large amount of oxidizing agent, sodium chlorate, etc. will be added in the leaching process, resulting in an increase in cost.

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