Method for extracting and recycling zinc from beneficiation tailing water of lead silver residues of zinc hydrometallurgy

Abstract

The invention discloses a method for extracting and recycling zinc from beneficiation tailing water of lead silver residues of zinc hydrometallurgy. The method comprises the steps of (1) removing impurities from beneficiation tailing water of lead silver residues of zinc hydrometallurgy, adding a beneficiation reagent, and filtering; (2) adding industrial magnesium hydroxide, and stirring; (3) carrying out two-stage counter-current extraction on the slurry through adopting organic phases; (4) carrying out two-stage counter-current washing on loaded organic phases through adopting a diluted acid solution; (5) carrying out reverse extraction on water washing organic phases through adopting a waste electrolyte; and (6) deoiling a stripping solution. According to the method, the washing efficiency is effectively improved, inclusion transmission of cadmium impurities is reduced, and the loss of the organic phases in a water phase outlet is reduced; and filtration is carried out through a filter press adopting silicone oil filter paper as a medium, the stripping solution of which the oil content is 0.5 ppm or below is stably produced, and the method has important meaning for stable electrolytic production.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for extracting and recovering zinc from lead and silver slag beneficiation tailings water of zinc hydrometallurgy. Background technique [0002] Comprehensive recovery in the process of hydrometallurgy is of great significance to improving the economic benefits of enterprises, and is also conducive to resource utilization and environmental protection; , you can use the beneficiation method to obtain silver concentrate to recover silver and lead; but for the zinc contained in the lead-silver slag, there is currently no economical and effective method to recover [0003] The publicly reported methods for recovering zinc from zinc-containing solid materials include ammonia leaching-electrodeposition process (CN200810045082.6 and CN201410188406.7), alkali leaching-electrodeposition process (CN200710099413.X), acid leaching-sulfide precipitation process (...

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Problems solved by technology

[0004] The extraction process based on the acidic phosphorus-type extractant can also be directly used in the treatment of zinc-containing solutions, such as patents CN 101041520A, CN 1837380A and CN 201310666140; but the main difficulties in the industrial practice of extraction-electrowinning recovery of zinc are: 1 1. The extraction rate or transfer efficiency of zinc is not high; 2. It is difficult to separate impurities (represented by cadmium) (CN 1237642A and CN98112497.6); 3. The loss of the organic phase in the raffinate and stripping solution is large, and it enters The organic phase of the stripping solution will seriously affect the current efficiency and quality of the electrodeposited zinc

[0005] In view of the fact that a large amount of zinc contained in lead-silver slag is water-soluble zinc, the process of mineral processing and extraction of zinc also plays a role in the process of slag washing; therefore, the extraction and recovery of zinc from the mineral processing tailings water of lead-silver slag can reduce the need for stirring tanks, filter presses and other equipment. Compared with the separate leaching / washing-filtration-extraction process of lead and silver slag, the investment is more reasonable; but the above three problems also exist when the zinc-containing tailings water is treated by the extraction-electrowinning method, namely, the zinc extraction rate ( Transfer efficiency) is low, impurities such as cadmium and zinc are difficult to separate, and the problem of large organic loss in the extract / re-extraction

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