Settling separation method for nickel leaching solution

Abstract

The invention discloses a settling separation method for a nickel leaching solution, and relates to an improvement of the settling separation method for the nickel leaching solution in the process of producing metallic nickel by adopting hydrometallurgy. The separation process comprises the following steps of carrying out dense separation on ore pulp produced in a leaching process by adopting a thickener, and filtering dense overflow supernate by adopting a precision machine; and the method is characterized by further comprising the following steps of adding a flocculating agent into the overflow supernate which is subjected to dense separation by adopting the thickener for a flocculating settling reaction, and carrying out precise separation on the supernate which is subjected to flocculating settling. According to the method, the chemical property of the overflow liquid is not changed, the content of main valuable elements is basically unchanged, only the solid content in the overflow liquid is agglomerated, the sedimentation of the solid content is accelerated, the effect is good, the loss of valuable metal materials in the thickening process is effectively prevented, and the production cost is reduced.

Description

technical field [0001] The invention discloses a method for sedimentation and separation of nickel leaching solution, which relates to an improvement of the method for sedimentation and separation of nickel leaching solution in the process of producing metal nickel by hydrometallurgy. Background technique [0002] In the process of wet production of metallic nickel, the production process includes the process steps of "leaching-extraction-electrodeposition" to produce electrolytic nickel. Among them, the ore pulp produced in the leaching process is first thickened and separated by a thickener, and the thick overflow supernatant is filtered by a precision machine to make the leachate meet the requirements of subsequent extraction production. [0003] Due to the particularity of raw materials in the production process, the difficulty of end-point control and other factors, the leaching thickener often has poor settling effect and the overflow liquid of the thickener "runs mudd...

AI Technical Summary

Problems solved by technology

[0003] Due to the particularity of raw materials in the production process, the difficulty of end-point control and other factors, the leaching thickener often has poor settling effect and the overflow liquid of the thickener "runs muddy", which not only leads to the failure rate of the precision filter of the leachate High, the liquid after filtration is not clear, which will lead to the increase of the third phase in the extraction process, and the failure rate of extraction and stripping equipment will increase, thereby reducing the extraction production capacity, which will eventually lead to problems such as production capacity not meeting the design requirements and increased production costs.

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