Treatment method of nickel cobalt precipitation post liquid

Abstract

The invention discloses a treatment method of nickel cobalt precipitation post liquid. The treatment method comprises the following steps of: (1) mixing a first-stage nickel cobalt precipitation post liquid with a first calcium hydroxide solution to obtain a second-stage nickel cobalt precipitation post pulp; (2) thickening the second-stage nickel cobalt precipitation post pulp to obtain a second-stage nickel cobalt precipitation overflow and a second-stage nickel cobalt precipitation thick pulp, and neutralizing and leaching a part of the second-stage nickel cobalt precipitation thick pulp; (3) mixing the other part of the second-stage nickel cobalt precipitation thick pulp with a second calcium hydroxide solution to obtain mixed pulp, and returning the mixed pulp to the step (1) to replace the first calcium hydroxide solution to be mixed with the first-stage nickel cobalt precipitation post liquid, wherein the first-stage nickel cobalt precipitation post liquid is derived from the hydrometallurgical process of a laterite nickel chloride system. According to the method disclosed by the invention, the settling performance of the obtained second-stage nickel cobalt precipitation thick pulp can be remarkably improved, and the obtained second-stage nickel cobalt precipitation thick pulp returns to the neutralization and leaching process so that the solid content of a neutralized post liquid is low.

Description

technical field [0001] The invention belongs to the field of nickel-cobalt hydrometallurgy, in particular, the invention relates to a method for treating liquid after precipitation of nickel and cobalt. Background technique [0002] At present, sulfuric acid system is generally used in the nickel metal smelting process of wet laterite ore, while the chloride hydrochloric acid system has the characteristics of high efficiency and small amount of slag, and has been widely studied at present. Generally, milk of lime is used as a precipitating agent in the second-stage nickel precipitation process, which is directly added to the first-stage nickel-cobalt precipitation solution for reaction. The principle is simple, the operation is simple, and the raw material of the precipitant is easy to purchase, so it is more commonly used in the nickel precipitation process in the industry. However, due to its strong alkalinity, it is easy to form local over-alkali when adding materials in ...

AI Technical Summary

Problems solved by technology

However, due to its strong alkalinity, it is easy to form local over-alkali when adding materials during actual industrial operation, resulting in small sediment particle size and poor settling energy.

[0003] Therefore, the existing technology for treating the nickel-cobalt precipitated liquid obtained from the hydrometallurgy process of laterite nickel ore chloride system needs to be further improved

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