Method for extracting zinc and enriching cobalt from solution containing zinc and cobalt

Abstract

The invention discloses a method for extracting zinc and enriching cobalt from a solution containing zinc and cobalt, which comprises the following steps: forming an extraction organic phase by adopting di (2-ethylhexyl) phosphate and sulfonated kerosene, oscillating for primary extraction to obtain a primary extraction solution and a primary extraction raffinate, and washing the primary extraction solution with a solution containing zinc salt to obtain a loaded organic phase and a washing water phase; combining the washing water phase and the primary extraction raffinate, and oscillating by adopting a composite extraction agent for re-extraction to obtain a re-extraction solution and a re-extraction raffinate; and after the primary extraction liquid and the secondary extraction liquid are subjected to reverse extraction respectively, reverse extraction liquid is combined, zinc is recycled through electrolytic deposition, and cobalt is enriched in the secondary extraction raffinate through a magnetic solid phase. The method has the advantages of simple process, no special equipment requirement, easy realization of industrialization, cost input saving, no introduction of new impurities in extraction and other processes, high purity of recovered zinc, and few impurities, and creates favorable conditions for effective utilization of cobalt through enrichment of cobalt, and has good economic value.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for extracting zinc and enriching cobalt from a solution containing zinc and cobalt. Background technique [0002] Cobalt metal is widely used in aerospace, machinery manufacturing, chemical and ceramics industries. With the development of my country's economy, the consumption of cobalt continues to increase, but my country's cobalt resources are scarce, and large-scale cobalt-bearing deposits are scarce. Most of the cobalt is associated with other metal deposits in lower grades. At present, in the process of mining and utilization of metallic zinc, it is found that a small amount of cobalt associated with zinc ore is enriched in the process of beneficiation of zinc ore, and then separated in the form of purified slag in the process of zinc hydrometallurgy. With the continuous expansion of my country's hydrometallurgical zinc production capacity, the...

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Problems solved by technology

[0003] At present, the following methods are generally used to treat the cobalt-containing waste residue: (1) Selective leaching method: this process leaches the cobalt-containing residue under certain conditions, so that most of the zinc is dissolved in the solution, and the cobalt is left in the leached residue In this process, the purpose of separation and enrichment of zinc and cobalt can be achieved, but this process can only partially separate zinc and cobalt in practical application, and cannot achieve the purpose of efficient separation and recovery of zinc and cobalt; (2) ammonia-ammonium sulfate method: existing Paper (Zhao Yankai, Tang Motang. A new treatment process for cobalt slag purification by hydrometallurgy[J]. Journal of Central South University of Technology, 2001,32(4):371-375.) Using ammonia water and ammonium sulfate system, the role of oxidant The cobalt-containing slag that has been baked is leached under the bottom, and then the leaching supernatant is deeply purified by zinc powder purification method and zinc is separated from cadmium, cobalt, copper, etc., and the solution after cobalt removal is produced by ammonium solution electrolysis. Electrolytic zinc , while the cobalt-containing slag is further processed, this method does not effectively enrich and recycle cobalt

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