Method for recovering valuable metals while leaching zinc from zinc sulfide concentrate with pressurized oxygen

Abstract

The invention relates to a method for leaching zinc and recovering valuable metals through carrying out pressurized oxidation on zinc sulfide concentrates. The method can be used for simultaneously treating zinc sulfide concentrates rich in lead, silver and dissipated metals and zinc sulfide concentrates free of lead, silver and dissipated metals. The method comprises the steps of firstly, carrying out peracid leaching on most of zinc and dissipated metals in zinc sulfide concentrates rich in zinc and valuable metals into a solution at high temperature and high pressure to obtain heavy metal contained residues, namely, lead and silver residues; then, carrying out weak acid leaching on zinc in the zinc sulfide concentrates only containing zinc at high temperature and high pressure, and meanwhile, separating iron and gangue components from main metal zinc; finally, settling gallium, germanium, indium and the like in the dissipated metals in the leached solution by using a neutralizing agent, and enriching gallium, germanium, indium and the like into neutralized residues. The method can be used for simultaneously treating zinc sulfide concentrates with different components under the condition that technical parameters and supporting facilities are not changed; in addition, the recovery rate of zinc is high, and meanwhile, the recovery rate of valuable metals is also high.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for zinc sulfide concentrate leaching zinc with pressurized oxygen while recovering valuable metals. Background technique [0002] Zinc pressure oxygen leaching is suitable for processing various raw materials with different components, such as: low-grade high-iron zinc sulfide concentrate, lead-zinc mixed concentrate, zinc ferrite slag produced by zinc factories, and high-lead, high-copper and high-grade zinc slags that are not suitable for roasting. A fine-grained zinc concentrate of silicon. These raw materials can be roughly divided into two types. One type of raw material is mainly composed of zinc and does not contain recyclable valuable metals. The other type of raw material contains not only zinc but also recyclable valuable metals, such as lead and silver. , copper and scattered metal gallium, germanium, indium, etc. [0003] Zinc pressure ...

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Problems solved by technology

[0004] One way is to mix zinc sulfide concentrates of different components and then adopt zinc pressure oxygen leaching treatment. The technical parameters, process control conditions and supporting facilities remain unchanged. Zinc sulfide concentrate, the result is to obtain high zinc recovery rate, then the comprehensive recovery rate of valuable metals is low, and to obtain high comprehensive recovery rate of valuable metals, the zinc recovery rate is low

[0005] Another way is to treat zinc sulfide concentrates with different components according to the same composition, and use zinc pressure oxygen leaching separately for a certain period of time, and adopt different technical parameters and process control conditions for zinc sulfide concentrates with different components. The supporting facilities should be rectified accordingly. Although this method can obtain a higher zinc recovery rate and comprehensive recovery rate of valuable metals, due to changes in technical parameters, there will be a running-in period in the production process that will affect the technical indicators, and the supporting facilities need to be rectified accordingly. For a certain amount of time and cost, zinc pressure oxygen leaching is used for zinc sulfide concentrates with different components in production. It is unrealistic to change the technical conditions and corresponding supporting facilities frequently.

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