Cobalt and nickel extraction separation method capable of reducing coextraction

Abstract

The invention belongs to the field of cobalt and nickel separation recycling, and particularly relates to a cobalt and nickel extraction separation method capable of reducing coextraction. The separation method sufficiently combines the characteristics and needs of cobalt and nickel extraction and separation, a buffer action mechanism is used for maintaining the water phase pH to be within the optimal pH range of cobalt rather than the optimal pH range of the nickel in the cobalt and nickel extraction process, meanwhile, key process parameters in the extraction process are controlled and adjusted, the buffer capacity of a buffer solution is maintained, the coextraction of nickel is reduced, and the technical problem that during cobalt and nickel extraction and separation in the prior art,due to the fact that in the extraction process, pH of liquid rises, nickel co-extraction is serious, and finally, the cobalt and nickel separation efficiency is reduced is solved.

Description

technical field [0001] The invention belongs to the field of separation and recovery of cobalt and nickel, and more specifically relates to a method for extracting and separating cobalt and nickel that reduces co-extraction of cobalt and nickel. Background technique [0002] Cobalt and nickel are two very important non-ferrous metals. They are important raw materials for the manufacture of some alloy materials such as anti-oxidation alloys, high-strength alloys, and precision instrument alloys. They are two important constituent metals in lithium battery materials. Because the chemical properties of cobalt and nickel are very similar, they are often symbiotic and associated in ore deposits, so nickel is often contained in various cobalt-containing waste slags, such as nickel smelting converter slag, copper smelting cobalt-containing converter slag, nickel refining cobalt-containing slag, etc. Cobalt and nickel are also contained in special alloy materials, battery materials,...

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a co-extraction-reducing co-nickel extraction and separation method, which fully combines the characteristics and requirements of cobalt-nickel extraction and separation, and specifically proposes the use of a buffer mechanism to maintain cobalt-nickel During the extraction process, the pH of the aqueous phase is within the optimum pH range for extracting cobalt rather than the optimum pH range for nickel. At the same time, the key process parameters in the extraction process are controlled and adjusted to maintain the buffering capacity of the buffer solution, thereby reducing the cobalt content of nickel. Extraction, thereby solving the technical problem that the co-extraction of nickel is serious due to the pH change of the feed liquid in the extraction process when the prior art uses extraction to separate cobalt and nickel, which eventually leads to a decrease in the separation efficiency of cobalt and nickel

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