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Processing method of zinc smelting byproducts

A treatment method and by-product technology, which are applied in the treatment of zinc smelting by-products and the treatment of cadmium-rich smoke and dust, can solve the problems of complex process, large consumption of zinc powder, and many secondary materials, and achieve simplified treatment process flow, The effect of shortening the production cycle and reducing the processing cost

Inactive Publication Date: 2009-09-02
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Using the above-mentioned process to treat zinc-containing copper-cadmium slag or cadmium-rich smoke produced in the process of hydrometallurgy zinc, the process is very complicated, the treatment cycle is long, the types of chemical raw materials and equipment required are many, and the intermediate by-products are many secondary materials.
The consumption of zinc powder is large, and the accumulation of metal zinc in the production process increases the production cost

Method used

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Embodiment 1

[0014] This embodiment provides a treatment method for by-products of zinc smelting. First, copper-cadmium slag is heat-treated in air, and the copper-cadmium slag after the heat treatment is leached with a mixed aqueous solution of ammonia and ammonium sulfate (or ammonium carbonate) at room temperature, and then extracted with organic Copper is removed by the method of solvent extraction, and then metal cadmium is directly produced from the solution containing zinc and cadmium by low current density electrolysis. Specifically include: Take 900g of copper cadmium slag, its main components are (%): Zn 36.51, Cu 3.63, Cd 7.85, Fe 2.55, As 0.05, Sb 0.02, heat treatment in air at 260-310°C for 8 hours, pour it after cooling Put it into a 5L beaker, add 3.5L of a mixed aqueous solution of ammonia water and ammonium sulfate (or ammonium carbonate), the concentration of ammonia in the mixed aqueous solution is 40g / L, and the ammonium sulfate (or ammonium carbonate) is 180g / L, and it ...

Embodiment 2

[0016] This embodiment provides a treatment method for by-products of zinc smelting. First, the mixed aqueous solution of ammonia water and ammonium sulfate (or ammonium carbonate) is used to leach cadmium-rich smoke dust at room temperature, and then the method of extracting with an organic extractant is used to remove copper, and then use a low current density Electrolysis produces metal cadmium directly from a solution containing zinc and cadmium. Specifically include: take 1000g of cadmium-rich dust, its main components are (%): Zn 0.51, Pb 50.62, Cd 14.32, As 0.96, pour it into a 5L beaker, add 3.5L of a mixed aqueous solution of ammonia water and ammonium sulfate (or ammonium carbonate) , the ammonia concentration in the mixed aqueous solution is 40g / L, the ammonium sulfate (or ammonium carbonate) is 120g / L, and the air is introduced to stir and leaching, the leaching time is 12h, and the leaching temperature is 45°C. After leaching, the leaching solution is filtered. S...

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Abstract

The invention relates to a processing method of zinc smelting byproducts. The method comprises the following steps: firstly, using a mixed aqueous solution of ammonia and ammonia sulfate (or salvolatile) to leach copper-cadmium slag or cadmium-rich soot after heat treatment at a room temperature; then, decoppering a leaching solution by an organic solvent extraction method; directly producing metal cadmium from a solution containing zinc and cadmium by a low current density electrolytic method instead of a technological method of adopting zinc powder replacement to obtain sponge cadmium; using a sulphuric acid solution as strip liquor to strip copper from a decoppered organic extraction agent and then electrolyzing the copper-contained strip liquor to prepare the metal copper; in addition, electrolyzing the decoppered leaching solution which only contains zinc and cadmium to extract the cadmium; eliminating the mutual interference of copper ions and cadmium ions in the electrolytic process of the cadmium; and returning the electrolyzed leaching solution to the zinc production process. The method simplifies the processing technological process, shortens the product period, can respectively obtain a purer copper product and a purer cadmium product and decreases the zinc smelting byproducts and the processing cost.

Description

technical field [0001] The invention relates to a treatment method for by-products of zinc smelting, and belongs to the technical fields of environmental protection and comprehensive utilization of nonferrous metals. In particular, it relates to a treatment method for copper cadmium slag produced in the process of hydrometallurgy and cadmium-rich smoke produced during zinc smelting. technical background [0002] In the process of hydrometallurgy, in order to obtain high-quality metal zinc, improve current efficiency and reduce power consumption, it is necessary to purify and remove impurity ions Co, Ni, Sb, Cu and Cd in the electrolyte before electrolysis. Among them, the method of zinc powder replacement is generally used to remove Cu and Cd, and produce copper-cadmium slag containing a large amount of metal zinc. The main components of copper cadmium slag are Zn, Cd, Cu metal and other oxides, and also contain a small amount of impurities such as As, Sb, Fe, Co, Ni, etc. ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C25C1/12C25C1/16
CPCY02P10/20
Inventor 李敦钫王成彦尹飞陈永强王念卫王军杨卜揭晓武杨永强郜伟阮书峰王忠
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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