Method for comprehensively recovering zinc nickel cadmium from copper cadmium residues

A zinc-nickel-cadmium and copper-cadmium slag technology, applied in the field of nickel, cadmium, and zinc recovery, can solve the problems of large chemical consumption, harsh conditions, low metal purity, etc., to reduce equipment input costs, low costs, and metal recovery. high rate effect

Inactive Publication Date: 2017-02-22
江西自立环保科技有限公司
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Problems solved by technology

[0006] Both of the above two methods can effectively recover the valuable metal elements in copper cadmium slag, but the first method has a long production process, complicated process and harsh conditions, and the second method needs to consume a large amount of chemicals, and the production cost is high. And the metal purity obtained is lower

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  • Method for comprehensively recovering zinc nickel cadmium from copper cadmium residues

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Embodiment 1

[0029] Embodiment 1: according to figure 1 Operate as shown.

[0030] The chemical composition of a typical copper-cadmium slag is shown in Table 1.

[0031] Table 1 Chemical composition of a typical copper-cadmium slag, unit: %

[0032] Cu Zn Cd Ni Fe Pb sn 1.72 4.61 22.28 0.67 0.67 4.23 0.27

[0033] A. Leaching

[0034] Add water to copper-cadmium slag according to the liquid-solid ratio of 4~5 / 1 to make slurry, blow in air, add concentrated sulfuric acid, adjust the pH value of the leaching end point to 4.0~5.0, stop the oxygen after 2 hours of oxidation reaction, and add step C The crude cadmium obtained in the second stage of cadmium precipitation replaces copper, and 1.5 times the theoretical amount is added. After a reaction time of 1 hour, samples are taken for Cu and Fe tests. After passing the test, the leachate is obtained by filtration. The components of the leachate are: Cu 0.064g / L, Fe 0.0012g / L, Zn 7.03g / L, Cd 50.0g / L, Ni...

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Abstract

The invention relates to a method for comprehensively recovering zinc nickel cadmium from copper cadmium residues. The method is characterized by including the steps: A leaching and purifying: simultaneously leaching and purifying the copper cadmium residues and filtering the copper cadmium residues to obtain leach liquor; B primary cadmium settling: adding zinc powder into the leach liquor in the step A to obtain primarily cadmium settled liquor and a sponge cadmium product; C secondary cadmium settling: adding substitute zinc powder into the primarily cadmium settled liquor in the step B to obtain secondarily cadmium settled liquor and crude cadmium; D zinc ingot production: performing 'extraction-washing-back extraction-electrodeposition-casting' procedures for the secondarily cadmium settled liquor obtained by the step C to produce a zinc ingot product; E nickel hydroxide neutralization and precipitation: precipitating and neutralizing nickel in zinc extraction raffinate obtained in the step D to obtain a nickel hydroxide product. The method is simple in process, low in cost and high in metal recovery rate, has the advantages of short process cycle, high efficiency and easiness in realizing automation and continuity, and is a clean pollution-free production process.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for recovering zinc, nickel and cadmium from copper-cadmium slag produced in a zinc smelting process. Background technique [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 Cu2+, Cd2+, and Ni2+ in the electrolyte before electrolysis. In industrial production, the method of zinc powder replacement is generally used to remove Cu2+, Cd2+ and Ni2+, and produce copper-cadmium slag containing a large amount of metallic zinc, generally containing 3-20% zinc, 10-30% cadmium, 1-5% copper, and 0.2% nickel. ~1.0%. Existing copper cadmium slag treatment methods include fire method and wet treatment process, and the wet process has the characteristics of low energy consumption, environmental protection, easy automation and mechani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B17/00C22B23/00C22B7/00C22B19/30
CPCC22B7/007C22B17/04C22B19/30C22B23/043C22B23/0469Y02P10/20
Inventor 柯兆华宁建平
Owner 江西自立环保科技有限公司
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