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Method for zinc raw material dechlorination in zinc hydrometallurgy

A technology of hydrometallurgy and raw materials, applied in the field of hydrometallurgy, can solve the problems such as inability to dechlorinate treatment, achieve good dechlorination effect, no environmental pollution, and increase the effect of waste residue

Inactive Publication Date: 2011-11-02
孙位成
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it has the characteristics of low production cost and no increase in waste residue, waste gas, and waste water discharge, it can only dechlorinate zinc sulfate solution, and cannot directly dechlorinate zinc-containing raw materials with high chlorine content.

Method used

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  • Method for zinc raw material dechlorination in zinc hydrometallurgy

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A method for dechlorination of zinc-containing raw materials in zinc hydrometallurgy, specifically comprising the following sequential steps, ①. Ball milling process: 10 tons of high-chlorine zinc-containing raw materials (the mass percentage of chlorine is 2.5%) are ball-milled with a drum ball mill and added with water to form a slurry. After ball-milling, samples are taken so that they can pass through an 80-mesh sieve; ②. Washing process: pump the ball mill slurry in step ① into the washing tank, add 100 m 3 Water, the liquid-solid mass ratio of water and the material in the slurry is 10.0:1, and the slurry is stirred and washed at a temperature of 30°C for 120 minutes, and the chlorine content in the solution is 1.85g / L. The zinc content in the medium is 2.45g / L. After washing, filter, the filtrate enters the zinc precipitation tank, and the filter residue is sampled. The chlorine mass percentage in the dry residue is 0.65%, and the filter residue enters the neutra...

Embodiment 2

[0032] A method for dechlorination of zinc-containing raw materials in zinc hydrometallurgy, specifically comprising the following sequential steps, ①. Ball milling process: 10 tons of high-chlorine zinc-containing raw materials (the mass percentage of chlorine is 2.5%) are ball-milled with a drum ball mill and added with water to form a slurry. After ball-milling, samples are taken so that they can pass through an 80-mesh sieve; ②. Washing process: pump the ball mill slurry in step ① into the washing tank, add 60m 3Water, the liquid-solid mass ratio of water and the material in the slurry is 6.0:1, and the slurry is stirred and washed at a temperature of 50°C for 150 minutes, and the chlorine content in the solution is 3.32g / L. The zinc content in the medium is 4.07g / L. After washing and filtering, the filtrate enters the zinc precipitation tank, and the filter residue is sampled. The chlorine mass percentage in the dry residue is 0.51%, and the filter residue enters the neut...

Embodiment 3

[0035] A method for dechlorination of zinc-containing raw materials in zinc hydrometallurgy, specifically comprising the following sequential steps, ①. Ball milling process: 10 tons of high-chlorine zinc-containing raw materials (the mass percentage of chlorine is 2.5%) are ball-milled with a drum ball mill and added with water to form a slurry. After ball-milling, samples are taken so that they can pass through an 80-mesh sieve; ②. Washing process: pump the ball mill slurry in step ① into the washing tank, add 40m 3 Water, the liquid-solid mass ratio of water and the material in the slurry is 4.0:1, and the slurry is stirred and washed at a temperature of 60°C for 180 minutes, and the chlorine content in the solution is 4.75g / L. The zinc content in the medium is 6.1g / L. After washing and filtering, the filtrate enters the zinc precipitation tank, and the filter residue is sampled. The chlorine mass percentage in the dry residue is 0.59%, and the filter residue enters the neut...

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Abstract

The invention relates to a method for zinc raw material dechlorination in zinc hydrometallurgy. The method comprises the following steps: 1, ball-grinding: ball-grinding raw materials into a slurry with a particle size of less than 80 meshes; 2, washing: adding water to the slurry, washing, filtering, allowing a filtrate to enter into a zinc precipitation process, and allowing a filter residue toenter into a neutral leaching process; 3, precipitating zinc: adding a zinc precipitant to the filtrate obtained in step 2, precipitating zinc, filtering, allowing a filtrate to enter into a waste water processing process, and allowing a filter residue to enter into a neutral leaching process; 4, carrying out neutral leaching: adding an electrolytic waste liquid and sulfuric acid to the filter residue obtained in the step 2, adding the zinc precipitation filter residue obtained in step 3, stirring, filtering, allowing a filtrate to enter into an advanced dechlorination process, and sending a filter residue to an environmental protection processing station; 5, carrying out advanced dechlorination: adding a cooper residue dechlorination agent and sulfuric acid to the filtrate obtained in step 4, reacting, filtering, allowing a filtrate to enter into a zinc hydrometallurgy process, and selling a filter residue outside; and 6, processing waste water: carrying out environmental processing on the filtrate obtained in the step 3, and discharging when standards are reached. The method has the characteristics of good dechlorination effect, low cost, strong operability, substantial economicbenefit and the like.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy in nonferrous metallurgy, and in particular relates to a method for dechlorinating zinc-containing raw materials in hydrometallurgy. Background technique [0002] Compared with pyro zinc smelting, hydrometallurgy has the characteristics of environmental protection, low cost and high recovery rate. Globally, 75% of metal zinc is produced by wet method. However, in the hydrometallurgy process, the chlorine content in the electrolytic solution needs to be strictly controlled, if the chlorine content is too high (Cl - >0.3g / L), it will strengthen the corrosion rate of the electrolytic anode plate, increase energy consumption, reduce the quality of zinc ingots, and increase the cost of zinc smelting. This makes a large amount of zinc-containing raw materials with high chlorine content unable to be directly used in zinc hydrometallurgy. [0003] At present, for zinc-containing raw materials with high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/04C22B3/20C22B3/46C22B19/00
CPCY02P10/20
Inventor 孙位成
Owner 孙位成
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