Combined leaching process of cobalt nickel hydroxide and cobalt nickel sulfide

Abstract

The invention relates to a combined leaching process of cobalt nickel hydroxide and cobalt nickel sulfide. The combined leaching process of the cobalt nickel hydroxide and the cobalt nickel sulfide comprises the following steps: performing neutralization reaction on the cobalt nickel hydroxide and sulfuric acid to obtain a mixture of ore pulp and trivalent cobalt and nickel hydroxide solid; mixing cobalt nickel sulfide powder and the trivalent cobalt and nickel hydroxide solid and performing redox reaction at a temperature of 80 to 90 DEG C to finally obtain a sulfur residues and leaching liquid. The combined leaching process of the cobalt nickel hydroxide and the cobalt nickel sulfide has the beneficial effects that two ore materials are leached, an oxidizing agent and a reducing agent are not needed, the production of chlorine and sulfur dioxide gas is avoided, and considerable economic benefit and environmental benefit are achieved.

Description

technical field [0001] The invention relates to a leaching process, in particular to a combined leaching process of cobalt-nickel hydroxide and cobalt-nickel sulfide, which belongs to the field of leaching of non-ferrous metal ore. Background technique [0002] Nickel is a very important non-ferrous metal raw material. It has good mechanical strength, ductility and high chemical stability. It is widely used in the production of stainless steel and various alloys. It is an indispensable metal for the development of modern human civilization. [0003] Nickel resources on the earth are relatively rich. According to the report of the US Geological Survey, the world’s identified nickel metal output is about 62 million tons, but my country’s nickel resources are relatively poor, and a large amount of electro-nickel and nickel-containing raw materials need to be imported every year. . Laterite nickel ore is formed by weathering, leaching, alteration, and enrichment of nickel ore. ...

AI Technical Summary

Problems solved by technology

[0004] There are mainly two ways to deal with primary laterite nickel ore, fire method and wet method. The wet method of laterite nickel ore treatment mainly includes (1) reduction roasting-ammonia leaching method (2) high pressure / atmospheric pressure acid leaching method, these two processes Obtain intermediate product cobalt nickel sulfide (NiS / CoS) and cobalt nickel hydroxide (Ni(OH) respectively 2 and Co(OH) 2 ), cobalt-nickel sulfide is reductive, so it is necessary to add an oxidizing agent in the wet leaching process, and the commonly used oxidizing agent is Cl 2 , NaClO 3 , although these two oxidants have good oxidation effects, they are dangerous and costly

Ni(OH) 2 and Co(OH) 2 Due to part of the Co during transportation 2+ 、Ni 2+ Oxidized to Co 3+ 、Ni 3+ , with oxidizing properties, a reducing agent, such as Na 2 SO 3 , SO 2 , Na 2 SO 8 , the reduction effect is good, but in the production process, it is easy to produce toxic and irritating gases, resulting in a poor production environment