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A new method for recovering cadmium from copper cadmium slag

A technology of copper cadmium slag and a new method, which is applied in the new process field of recovering metal cadmium, can solve the problems of low recovery rate of cadmium, harsh operating environment, large consumption of zinc powder, etc., and achieves reduction of workload, energy saving, and slowing down of sulfuric acid. The effect of accumulation of root ions

Active Publication Date: 2016-05-25
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method solves the disadvantages of high zinc powder consumption, low cadmium recovery rate, and harsh operating environment in the existing zinc hydrometallurgy process. The production process is environmentally friendly, the worker's operation safety is improved, and the pollution is small. The whole process basically does not discharge three wastes. It can realize the closed cycle of cadmium recovery and zinc smelting system to realize clean production in the true sense

Method used

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  • A new method for recovering cadmium from copper cadmium slag

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Effect test

Embodiment 1

[0036] Slurry the copper cadmium slag and immerse it in sulfuric acid. The sulfuric acid concentration is 8g / L, the leaching temperature is 80°C, the leaching time is 4h, the leaching liquid-solid ratio is 6:1, and the pH of the leaching end point is 5.5. After the pulp is filtered, the filtrate is sent for replacement once. , the filter residue is copper slag (Cu49%, Cd2%) and can be sold directly; slowly add zinc powder (0.8 times the theoretical consumption) to the liquid after the first replacement under stirring, and the replacement temperature is 50 ° C. After 30 minutes of reaction, cadmium is obtained Cotton contains 71.5% cadmium. After cake pressing, a cadmium cake containing 74.8% of cadmium and 3.6% of zinc and a slurry containing 65.1% of cadmium and 17.5% of zinc are obtained. The slurry was made into liquid, the liquid-making temperature was 85°C, the liquid-solid ratio was 6:1, the liquid-making time was 6 hours, and the initial H 2 SO 4 The concentration is ...

Embodiment 2

[0039] Slurry the copper cadmium slag and immerse it in sulfuric acid, the sulfuric acid concentration is 12g / L, the leaching temperature is 85°C, the leaching time is 4h, the leaching liquid-solid ratio is 6:1, the pH of the leaching end point is 5.3, and the pulp is filtered, and the filtrate is sent for replacement once. , the filter residue is copper slag (Cu50%, Cd1.8%) and can be sold directly; slowly add zinc powder (0.8 times the theoretical consumption) to the liquid after the first replacement under stirring, the replacement temperature is 50 ° C, and after 30 minutes of reaction, The obtained cadmium cotton contains 72.1% of cadmium. After cake pressing, a cadmium cake containing 75.5% of cadmium and 3.8% of zinc and a slurry containing 65.7% of cadmium and 16.7% of zinc are obtained. The slurry was made into liquid, the liquid-making temperature was 90°C, the liquid-solid ratio was 7:1, the liquid-making time was 5 hours, and the initial H 2 SO 4 The concentratio...

Embodiment 3

[0042] Slurry the copper cadmium slag and immerse it in sulfuric acid, the concentration of sulfuric acid is 15g / L, the leaching temperature is 95°C, the leaching time is 4h, the leaching liquid-solid ratio is 6:1, the pH of the leaching end point is 5.2, after the pulp is filtered, the filtrate is sent for replacement once , the filter residue is copper slag (Cu50.3%, Cd1.7%) and can be sold directly; slowly add zinc powder (0.8 times the theoretical consumption) to the liquid after the first replacement under stirring, the replacement temperature is 55 ° C, and the reaction is 30 min Finally, the obtained cadmium cotton contains 72.4% cadmium. After cake pressing, a cadmium cake containing 75.9% of cadmium and 4% of zinc and a slurry containing 66.0% of cadmium and 16.5% of zinc are obtained. The slurry was made into liquid, the liquid-making temperature was 80°C, the liquid-solid ratio was 6:1, the liquid-making time was 7 hours, and the initial H 2 SO 4 The concentration...

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Abstract

The invention discloses a novel method for recycling cadmium in copper-cadmium slag. A main technological process of the novel method is as follows: leaching copper-cadmium slag, carrying out primary replacing, pressing cake, preparing liquid by an overflow sizing agent, carrying out secondary replacing, obtaining rough cadmium by cake pressing, reducing and melting rough cadmium, and continuously distilling rough cadmium in vacuum to produce pure cadmium. The method disclosed by the invention solves defects of great zinc powder consumption, low cadmium recovery rate, and bad operation environment in an existing wet-process zinc smelting process, and is environment-friendly in production process, higher in operation safety of workers, small in pollution, almost free of emission of three wastes in the whole process, and capable of achieving closed-loop circulation of a cadmium recycling and zinc smelting system to realize clean production in true sense.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal metallurgy, in particular to a new process for recovering metal cadmium from copper cadmium slag. Background technique [0002] During the hydrometallurgy process, about 1300t of copper and cadmium slag is produced for every 10,000t of electric zinc produced. The slag generally contains 5-10% of Cd, 1.5-5% of Cu, and 28-50% of Zn. At present, the main methods of extracting cadmium from copper cadmium slag at home and abroad are wet and pyrotechnic processes. The main difference between the wet process and the fire process lies in whether the cadmium cotton is obtained by fire refining or cadmium electrolytic deposition. [0003] At present, the wet process of copper cadmium slag treatment includes ammonia leaching method and acid leaching method. The ammonia leaching method includes high pressure ammonia leaching and normal pressure ammonia leaching. High-pressure ammonia leaching puts...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B17/00
CPCY02P10/20
Inventor 蒋开喜王海北张邦胜汪胜东魏帮张登高蒋伟蒋训雄冯亚平刘巍
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY