Method for reducing zinc content of flotation silver concentrates

Abstract

The invention relates to a production treatment method for reducing the zinc content of flotation silver concentrates. The method comprises the following steps that (1) waste electrolyte is added into a concentrate tank for the flotation silver concentrates through a pipeline, and the proportion of the waste electrolyte and the silver concentrates is controlled to be 15-20:1; (2) the waste electrolyte and the flotation silver concentrates are subjected to stirring reaction for 10-30 min; and (3) ore pulp obtained after the reaction is subjected to filter pressing, filter residues are sent to a lead system for recovery of silver and zinc, and filtrate returns to a zinc system for recovery of zinc and copper. By means of the method, the recovery rate of zinc and copper is increased; the process is simple in operation without additional equipment and operation. The method has wide market prospects.

Description

technical field [0001] The invention relates to a production and treatment process for reducing the zinc content of flotation silver concentrate, which belongs to the field of nonferrous metal smelting. Background technique [0002] Zinc sulfide concentrate is accompanied by precious metal silver, and its silver content ranges from 50 to 1000g / t. In conventional hydrometallurgy, zinc sulfide concentrate is roasted, leached, purified, and electrolytically cast to produce zinc ingots, which are floated in the bottom flow. The silver concentrate is produced by beneficiation, and the silver concentrate is sent to the lead factory to recover valuable metals such as silver and zinc. The process flow is as follows figure 1 shown. [0003] In the conventional hydrometallurgy zinc process, the yield of silver concentrate is 5~7% (silver concentrate yield=silver concentrate ore amount / zinc sulfide concentrate input), zinc content is 22~28%, silver content is 1000~ 8000g / t, which has...

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Problems solved by technology

[0003] In the conventional hydrometallurgy zinc process, the yield of silver concentrate is 5~7% (silver concentrate yield=silver concentrate ore amount / zinc sulfide concentrate input), zinc content is 22~28%, silver content is 1000~ 8000g / t, which has a very high recovery value. Therefore, in the lead-zinc joint venture, the silver concentrate produced by the zinc system is sent to the lead system for comprehensive recovery. In the lead system, 99% of the silver in the silver concentrate will enter the lead anode The mud is sent to the silver recovery process, and only 35-50% of the zinc can be recovered into the zinc oxide of the fuming furnace, and more than 50% of the zinc enters the slag and is discarded, resulting in a decline in the recovery rate of zinc

Therefore, reducing zinc in silver concentrate has great benefits for conventional zinc smelting enterprises. It is proposed in patent number CN201310151918.1 (method for comprehensive recovery of zinc, copper, lead, gold, silver and sulfur from flotation silver concentrate) A method for reducing zinc in silver concentrates has been proposed, but the process is complicated, the process is long, high temperature and high acid conditions are required, and more equipment is added (need to increase high-pressure reactors), and the iron in silver concentrates will be destroyed under high temperature and high acid conditions. A large amount of leaching will eventually return to the system with the leaching solution, resulting in high iron in the zinc system, which is not conducive to clarification, increases the cost of sinking iron, and will cause a series of serious consequences

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