A kind of extraction agent for nickel electrolytic anolyte to remove copper, its preparation method and application

Abstract

The invention relates to an extraction agent for copper removal for a nickel electrolysis anode liquid, as well as a preparing method and application of the extraction agent. The extraction agent is N,N-2(tert-butyl oxycarbonylmethylene)-2-picolyl amine and derivatives thereof. The extraction agent has the advantages of high copper and nickel separation selectivity, high mass ratio of copper and nickel in a liquid subjected to reverse extraction, can be used for deep purification copper removal for nickel electrolysis anode liquids in a chlorine salt system and a chlorine salt-sulfate mixed system. The preparing method for the extraction agent is simple, obtains the effect that the copper and nickel separation coefficients reach 2027 and 716 respectively when being used in copper chloride and nickel chloride as well as copper chloride and nickel sulfate, reaches the mass concentration of copper being 0.9-1.8 mg / L in a copper removed liquid and the cooper and nickel mass ratio of 153-199 in a reverse extracted liquid when being used in the nickel electrolysis anode liquid in the chlorine salt system, reaches the mass concentration of copper being 1.2-1.8 mg / L in a copper removed liquid and the cooper and nickel mass ratio of 33-63 in a reverse extracted liquid when being used in the nickel electrolysis anode liquid in the chlorine salt-sulfate mixed system. The extraction agent provided by the invention meets the industrial requirements for deep purification copper removal for the nickel electrolysis anode liquid.

Description

Technical field [0001] The invention relates to an extractant for removing copper from nickel electrolytic anolyte, a preparation method and application thereof, and belongs to the field of non-ferrous metal hydrometallurgy. Background technique [0002] In the process of nickel electrolytic refining, the deep purification of nickel electrolyte anolyte to remove copper is the key to the production of high-quality nickel. Due to the similar chemical properties of copper and nickel, its effective separation has long been a problem that has plagued the metallurgical community at home and abroad. From the current research and production situation, the methods for purifying and removing copper from nickel electrolytic anolyte mainly include chemical precipitation, ion exchange and solvent extraction. [0003] The chemical precipitation method is a traditional method and one of the most used methods in actual production. It can be subdivided into nearly ten methods such as nickel sulfid...

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Problems solved by technology

Yang Jiaoyong et al. used the extraction agent Lix984N compounded by aldoxime and ketoxime. After two-stage extraction, the copper ion 500mg / L in the copper-removed solution of the nickel electrolysis anolyte could be reduced to below 2mg / L, and the solution after stripping The mass ratio of copper to nickel has reached 105 (Yang Jiaoyong, Liu Daxing, Sun Fengqin. Solvent extraction method for purifying nickel electrolytic anolyte to remove copper. CN1113521A.2007-12-20), but the extractant is in the recycling process due to the complex acidic environment It is easy to degrade due to other reasons, leading to problems such as emulsification and the formation of "three phases" (Liu Xiaorong, Qiu Guanzhou, Hu Yuehua. Research on the degradation behavior of Lix984N [J], Mining and Metallurgy Engineering, 2002(22):79-82)

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