Method for extracting cobalt from manganese-cobalt-nickel waste residues

Abstract

The invention discloses a method for extracting cobalt from manganese-cobalt-nickel waste residues. The method sequentially comprises the steps of a) adding water into manganese-cobalt-nickel residues according to a solid-to-liquid ratio of 1: (2-5), mixing into paste, and heating and bubbling under stirring to obtain cobalt-nickel foaming slag and manganese-iron sediment; b) heating, pickling and filtering the cobalt-nickel foaming slag to obtain a cobalt-nickel filter cake; c) curing and leaching the cobalt-nickel filter cake by concentrated sulfuric acid to obtain a cobalt-nickel solution; d) performing impurity removal on the cobalt-nickel solution to remove the impurities such as copper, iron, calcium, magnesium, manganese and zinc, and reduce the mass concentration of all the impurities in the solution to 0.01g/L below; e) extracting the cobalt-nickel solution after impurity removal by using a P507 extraction agent to separate out a nickel sulfate solution and a cobalt-loaded organic phase; f) performing back-extraction on the cobalt-loaded organic phase to obtain a cobalt sulfate solution. The method disclosed by the invention adopts relatively simple production conditions, can be used for efficiently grouping, and has a high recovery rate of cobalt.

Description

technical field [0001] The invention relates to a method for extracting heavy metals, in particular to a method for extracting cobalt from waste slag of manganese, cobalt and nickel. Background technique [0002] Cobalt and nickel are important non-ferrous metal resources that are in short supply in my country. Most of the manganese ores in southern China, especially in Guangxi, contain cobalt and nickel. [0003] When hydrometallurgy is used to produce electrolytic metal manganese, electrolytic manganese dioxide, manganese sulfate and other products, cobalt and nickel in manganese ore will enter the leaching solution in the first step together with manganese. During the leaching process of manganese ore, when the pH of the leaching end point is controlled to be 5 to 5.4, most of the impurity elements such as Fe can be removed, but Co and Ni still remain in the solution and must be recovered. At present, the method of deeply purifying impurity elements such as Co and Ni fro...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for extracting cobalt from manganese-cobalt-nickel waste residue. The waste of resources and the pollution of the environment caused by the failure to utilize the element nickel and cobalt

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