A kind of method for extracting nickel in manganese cobalt nickel waste slag

Abstract

The invention discloses a method for extracting nickel from manganese cobalt nickel waste slag. The method sequentially comprises the following steps of: (a) adding water to manganese cobalt nickel slag according to the solid-to-liquid ratio of 1:(2-5) for mixing, and heating and bubbling under stirring to obtain cobalt nickel foam slag and a ferromanganese iron dreg; (b) heating and acid-washing the cobalt nickel foam slag, and filtering to obtain a cobalt nickel filter cake; (c) curing and leaching the cobalt nickel filter cake with a concentrated sulfuric acid to obtain a cobalt nickel solution; (d) removing impurities including copper, iron, calcium, magnesium, manganese and zinc in the cobalt nickel solution so that the mass concentration of the impurities in the solution is reduced below 0.01 g / L; (e) extracting the cobalt nickel solution which is subjected to impurity removal with a P507 extraction agent and separating a nickel sulfate solution and a cobalt-loaded organic phase; and (f) carrying out cooling crystallization on the nickel sulfate solution and recycling a nickel sulfate product. The production conditions utilized in the method are relatively simple and can be efficiently grouped, and the nickel recycling rate is high.

Description

technical field [0001] The invention relates to a method for extracting heavy metals, in particular to a method for extracting nickel 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 nickel 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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