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Method for producing electrolytic zinc from zinc material with high-content of fluorin and silicon dioxide

A technology of silicon dioxide and electrolytic zinc, which is applied to the improvement of process efficiency, photographic technology, instruments, etc., to achieve the effects of comprehensive utilization, recycling, and reduction of environmental pollution

Active Publication Date: 2008-02-20
HULUDAO ZINC IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method solves the technical problem of fluorine and silicon reduction by adding metal salts during the extraction process of zinc raw materials to convert fluorine and silicon, separate and purify zinc raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Using raw materials containing 56% zinc, 4.17% fluorine, and 0.101% silicon dioxide, the electrolytic waste liquid produced by electrolytic zinc was leached, concentrated and settled, and a neutral zinc sulfate solution containing 155g / l of zinc was obtained. The fluorine solution contains 5.7g / l. In a mechanically stirred tank, the temperature is controlled at 20-60°C and the pH value is 2.0-5.0. Add powdered silicon dioxide at 20g / l and potassium sulfate at 8.7g / l to control The flow rate is continuously produced, the reaction time is 30-60 minutes, and then pumped into the box-type filter press for pressure filtration to obtain potassium fluorosilicate residue. The filtered solution is added with powdered calcium sulfate at 3.3g / l, and stirred for 40 minutes. After adding zinc powder to remove other impurities such as copper, cadmium, and cobalt, the obtained Zinc sulfate solution less than 0.0001g / l, through electrolysis process to produce cathode zinc flakes.

Embodiment 2

[0056]Use raw materials containing 56% zinc and 4.17% fluorine and raw materials containing 53% zinc and 7.0% silicon dioxide to mix according to the ratio of 1:1.8, and then use the electrolytic waste liquid produced by electrolytic zinc to leach, concentrate and settle, Prepare a neutral zinc sulfate solution containing 152g / l of zinc. In a mechanically stirred tank, control the temperature at 20-60°C, add potassium sulfate at 3.1g / l, control the flow rate for continuous production, and use the reaction time for 30-60 minutes. Put the pump into the box-type filter press and filter to obtain potassium fluorosilicate residue. Add powdered calcium sulfate to the filtered liquid at a rate of 3.3g / l, stir for 40 minutes, and add zinc powder to remove other impurities such as copper, cadmium, and cobalt. Finally, a zinc sulfate solution containing 153g / l of zinc, less than 0.0002g / l of copper, less than 0.0005g / l of cadmium, less than 0.001g / l of cobalt, 0.031g / l of fluorine, and l...

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Abstract

The invention belongs to the technical field of the copper metallurgy and discloses the method which adopts zinc material with high content of fluorine and silicon dioxide to produce electrolysis zinc in the producing process of wet processing zinc metallurgy. The producing method comprises the following process: raw material blending 1, zinc out immersing 2, segregating and obtaining neutral supernatant fluid 3, supernatant fluid removing the fluorine 4, removing impurity 5, obtaining purified zinc sulfate solution 6 and obtaining metallic zinc through zinc sulfate solution electrolysis 7. The invention has the technical property that the supernatant fluid is added with potassium sulphate or calcium sulphate to remove the fluorine before removing other impurities, or the neutral zinc sulfate solution is added with silicon dioxide and potassium sulphate and calcium sulphate to remove the fluorine and to purify the zinc sulfate solution. The invention is not only able to extract zinc element from the materials containing high content of fluorine and silicon dioxide and achieves the comprehensive utilization of the zinc metallurgy raw materials, but also achieves the recirculation of the potassium fluosilicate and reduces the resource waste and environmental pollution. Therefore, the invention is applicable to the producing process of wet processing zinc metallurgy.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metallurgy, and relates to a method for producing electrolytic zinc by using zinc materials with high fluorine and high silicon dioxide content in the hydrometallurgy production process. Background technique [0002] So far, the hydrometallurgy process is still the main method of zinc production. In the zinc hydrometallurgy process, if the fluoride ion content in the zinc sulfate solution exceeds the standard, the corrosion of the cathode plate in the electrolysis process will be accelerated, and in severe cases, production will not be possible. [0003] During the zinc leaching process, high silica content will form colloids, which will make the leached zinc sulfate solution unable to be clarified, resulting in difficulty in filtration. Therefore, all manufacturers have to control the fluorine content in the raw materials to be less than 0.002%, and the silicon dioxide content to be less than...

Claims

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Application Information

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IPC IPC(8): C25C1/16C22B3/08C22B3/44C22B19/00
CPCY02P10/20
Inventor 杨如中郭天立
Owner HULUDAO ZINC IND CO LTD
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