Method for recycling cadmium from metallurgical cadmium-contained dust and device for recycling cadmium from cadmium-ammonia solution

Abstract

The invention discloses a method for recycling cadmium from metallurgical cadmium-contained dust and a device for recycling cadmium from a cadmium-ammonia solution. The metallurgical cadmium-containeddust is subject to ammoniacal circular leaching, when the lead/cadmium molar ratio in the solution is smaller than 0.01, the circular leaching process is ended; after leaching is finished, liquid solution separation is carried out, and the cadmium-ammonia solution is obtained; the proper amount of vulcanizing agent is added to enable impurity ions in the cadmium-ammonia solution to be subject tovulcanization precipitation separation. After impurity removal, liquid is placed in an ultrasonic enhancing electric strengthening replacement cadmium extraction key device to be subject to efficientcadmium extraction, and high-grade sponge cadmium and zinc-ammonia solution can be obtained. The sponge cadmium can be directly used for briquetting distillation or fusion casting-electrolytic refining to obtain high-purity cadmium. The zinc- ammonia solution can be directly turned into an electric zinc system to produce electric zinc.

Description

technical field [0001] The invention relates to a method for recovering cadmium from metallurgical cadmium-containing smoke and a device for recovering cadmium from cadmium-ammonia solution. Background technique [0002] Cadmium resources exist in zinc ore, lead-zinc ore and copper-lead-zinc ore in nature, and most of them enter lead-zinc concentrate during flotation. At present, various lead-zinc smelting enterprises process more and more raw materials with high cadmium content, resulting in the continuous increase of cadmium entering the production system with raw materials. Analysis of cadmium pollution sources shows that the discharge of cadmium pollution factors from lead-zinc smelting accounts for 70% of the total cadmium pollution, and the cadmium-containing smoke and smelting slag produced by the lead-zinc smelting industry is currently the most important source of cadmium pollution. [0003] Roasting of concentrate, volatilization of leaching slag in rotary kiln, s...

AI Technical Summary

Problems solved by technology

On the whole, the above-mentioned cadmium extraction processes have their own characteristics, but the common problems in the cadmium extraction process such as "long process, low efficiency, difficult separation of zinc and cadmium, large consumption of zinc powder, and low recovery rate of cadmium" have not been resolved, and cadmium is dispersed and lost during the treatment process. There is always the risk of serious environmental pollution

In particular, cadmium-containing dust usually contains relatively high levels of F, Cl ions, etc., and when acid leaching is used, F and Cl ions enter the solution, which has a great impact on the quality of cadmium-removing liquid acid zinc.

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