Method for recovering valuable metals from copper-cadmium slag of zinc hydrometallurgy

A valuable metal, hydrometallurgical zinc smelting technology, applied in the improvement of process efficiency, instruments, optics, etc., can solve problems such as pollution, waste of resources and the environment, and achieve the effects of short process flow, high current efficiency, and efficient recovery

Active Publication Date: 2018-01-09
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of copper and cadmium slag is produced every year in the hydrometallurgy plant. If the waste slag is not properly treated and simply stored, it will waste resources and pollute the environment.

Method used

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  • Method for recovering valuable metals from copper-cadmium slag of zinc hydrometallurgy
  • Method for recovering valuable metals from copper-cadmium slag of zinc hydrometallurgy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as figure 1 Shown, the method for reclaiming valuable metals from the zinc-copper-cadmium slag of hydrometallurgy, its concrete steps are as follows:

[0026] (1) First, the copper cadmium slag (the copper cadmium slag produced during the zinc smelting process of a wet zinc smelting plant in Yunnan, whose composition contains Cu26.52wt%, Fe2.53wt%, Cd4.55wt%, Zn3.54wt% ) drying and dehydration, after drying, finely grind to a particle size of 100 mesh to obtain copper cadmium slag, add it to sulfuric acid solution, and perform one leaching to obtain cadmium-rich liquid and primary leaching residue; the specific process is: the solid-liquid ratio of copper cadmium slag and sulfuric acid solution 1:7g / mL, leached for 3 hours at a temperature of 60°C, and the concentration of the sulfuric acid solution was 60g / L;

[0027] (2) Dilute the primary leaching slag obtained in step (1) with zinc electrowinning waste liquid (the zinc electrowinning waste liquid includes the...

Embodiment 2

[0034] Such as figure 1 Shown, the method for reclaiming valuable metals from the zinc-copper-cadmium slag of hydrometallurgy, its concrete steps are as follows:

[0035] (1) First, the copper cadmium slag (the copper cadmium slag produced during the zinc smelting process of a wet zinc smelting plant in Yunnan, whose composition contains Cu34.52wt%, Fe1.03wt%, Cd5.94wt%, Zn3.87wt% ) drying and dehydration, and after drying, finely grind to a particle size of 200 mesh to obtain copper cadmium slag, add it to sulfuric acid solution, and perform one leaching to obtain cadmium-rich liquid and primary leaching slag; the specific process is: the solid-liquid ratio of copper cadmium slag and sulfuric acid solution 1:5g / mL, leached at 70°C for 2h, the concentration of sulfuric acid solution is 40g / L;

[0036] (2) Dilute the primary leaching slag obtained in step (1) with zinc electrowinning waste liquid (the zinc electrowinning waste liquid includes the following components: Zn: 45-...

Embodiment 3

[0043] Such as figure 1 Shown, the method for reclaiming valuable metals from the zinc-copper-cadmium slag of hydrometallurgy, its concrete steps are as follows:

[0044] (1) First, the copper cadmium slag (the copper cadmium slag produced during the zinc smelting process of a wet zinc smelting plant in Yunnan, whose composition contains Cu51.36wt%, Fe0.97wt%, Cd3.69wt%, Zn6.97wt% ) drying and dehydration, and after drying, finely grind to a particle size of 200 mesh to obtain copper cadmium slag, add it to sulfuric acid solution, and perform one leaching to obtain cadmium-rich liquid and primary leaching slag; the specific process is: the solid-liquid ratio of copper cadmium slag and sulfuric acid solution 1:6g / mL, leaching at 65°C for 2.5h, the concentration of sulfuric acid solution is 50g / L;

[0045] (2) Dilute the primary leaching slag obtained in step (1) with zinc electrowinning waste liquid (zinc electrowinning waste liquid includes components: Zn: 40-65g / L, H 2 SO ...

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Abstract

The invention relates to a method for recovering valuable metals from copper-cadmium slag of zinc hydrometallurgy, and belongs to the technical field of zinc hydrometallurgy in nonferrous metallurgy.The method comprises the following steps: primary leaching is carried out on the copper-cadmium slag to obtain a cadmium-rich solution and primary leaching slag; the obtained primary leaching slag issubjected to secondary leaching with a zinc electrodeposition waste solution as a leaching solution to obtain purified copper slag and a secondary leaching solution; normal-pressure oxidation acid leaching is carried out on the purified copper slag to obtain lead-silver slag and a copper-rich solution containing Zn and Cd; turbulence electrodeposition is carried out on the obtained copper-rich solution containing Zn and Cd, metal copper can be produced at a cathode after the turbulence electrodeposition, and a residual solution obtained after the electrodeposition is a copper-poor solution containing Zn and Cd; a part of the copper-poor solution containing Zn and Cd can be returned to the normal-pressure oxidation acid leaching process, and after active copper powder is added into the other part of the copper-poor solution containing Zn and Cd for precipitation and filtration, turbulence electrodeposition is carried out to obtain crude copper powder and a zinc-containing cadmium-rich liquid with the copper content no more than 2g / L; and finally, zinc powder replacement and alkali fusion casting are carried out to obtain a crude cadmium ingot. According to the method, the storage problem of the copper-cadmium slag as dangerous waste is solved.

Description

technical field [0001] The invention relates to a method for recovering valuable metals from zinc-copper-cadmium slag in hydrometallurgy, and belongs to the technical field of zinc hydrometallurgy in nonferrous metallurgy. Background technique [0002] Since the reform and opening up, especially in the last ten years, zinc hydrometallurgy has developed rapidly. A large amount of copper and cadmium slag is produced every year in the hydrometallurgy plant. If the waste slag is not properly disposed of but simply piled up, it will waste resources and pollute the environment. The comprehensive recovery of valuable metals in copper cadmium slag can not only make full use of raw materials to create huge economic benefits, but also solve the pollution to the environment during the process of transshipment or stacking. According to the physical and chemical properties of each metal in the separation process and the difference in the recovery process, the separation and recovery of ...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B17/00C22B15/00C25C1/12C25C5/02
CPCY02P10/20
Inventor 李博王华王选兵魏永刚尹云贵
Owner KUNMING UNIV OF SCI & TECH
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