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Comprehensive recovery method for neutralized deposited iron slag in zinc hydrometallurgy

A technology of hydrometallurgy and recovery method, which is applied to the improvement of process efficiency, photographic technology, instruments, etc., can solve the problems of low economic value and poor quality of iron products, and achieve purity, low pollution, and easy handling The effect of recycling

Active Publication Date: 2017-09-22
六盘水中联工贸实业有限公司
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AI Technical Summary

Problems solved by technology

Due to the dissolution of impurities such as Sb and Bi into the leaching solution, the quality of the obtained iron product is poor and the economic value is not large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0027] Examples: (1) The wet zinc smelting neutralization iron slag was taken for testing, containing 15.4% of zinc, 13.7% of iron, 0.15% of Sb, 0.34% of Bi, 0.085% of As, and 15% of water. According to liquid / solid = 3, wash with clean water at 80°C for 2 stages. The primary washing liquid contains 28.5g / L zinc, PH=5.2, and the secondary washing liquid contains 6.5g / L zinc, PH=6. Then use 10% hydrochloric acid, 15% ammonium chloride and 10% calcium chloride mixed solution in liquid / solid=3.5, under the condition of temperature 70 ℃, carry out 2-stage chlorination leaching to obtain the primary leaching solution containing Zinc 1.2g / L, Iron 25.2g / L, Sb21mg / L, Bi13mg / L, Ge5.8mg / L, PH=1, the secondary leach solution contains zinc 0.65g / L, iron 5.2g / L, Sb7.6mg / L L, Bi2.4mg / L, PH=0.5.

[0028] (2) The iron slag obtained by washing the zinc sulfate is carried out by neutralizing the heavy iron slag and washing with clear water in the step (1). Use the secondary leaching solution ...

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Abstract

The invention discloses a compressive recovery method for neutralized deposited iron slag in zinc hydrometallurgy. The compressive recovery method is characterized by comprising the steps that the neutralized deposited iron slag in the zinc hydrometallurgy is washed with hot water at the temperature of 80-90 DEG C, and zinc sulfate washing liquid and iron hydroxide slag are obtained; the iron hydroxide slag is leached with the mixed liquid of hydrochloric acid, ammonium chloride and calcium chloride, iron chloride leaching liquid and leaching slag mainly containing calcium sulfate, bismuth oxychloride and antimony oxychloride are obtained; Fe3+ is reduced into Fe2+ by adding iron electrolytic iron powder or scrap iron to the iron chloride leaching liquid, meanwhile, impurities including As, Sb, Bi, Cu, Pb and Ge are replaced and purified, and iron dichloride purified liquid and purified slag are obtained; and the electrolytic iron powder is obtained by electrolyzing the iron dichloride purified liquid, residual electrolyte is returned for chlorination leaching, and iron powder purified slag and chlorination leaching slag are combined into raw materials for extracting valuable metals of Bi and Sb. According to the compressive recovery method for the neutralized deposited iron slag in the zinc hydrometallurgy, the electrolytic leaching electrolytic iron powder method is used for comprehensive recovery and treatment of the neutralized deposited iron slag in the zinc hydrometallurgy, and the purposes of short process, low pollution, low cost and high benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a comprehensive recovery method for neutralizing iron slag in hydrometallurgy. Background technique [0002] Hydrometallurgical zinc removal is generally used to neutralize and oxidize hydrolysis to goethite (FeOOH) or Fe(OH) 3 method to remove iron from zinc sulfate solution. Due to FeOOH or Fe(OH) 3 Precipitation has adsorption and co-precipitates As, Sb, Bi, Cu, Pb, Ge, etc. It still contains more than 15% zinc sulfate aqueous solution during press filtration. Therefore, the iron slag contains more than 30% iron, more than 10% zinc, and more than 0.1% As, Sb, Bi, Cu, Pb, Ge, etc., which has comprehensive recovery value. [0003] At present, almost all hydrometallurgy enterprises use rotary kiln for reduction and volatilization treatment of neutralized heavy iron slag. Zn, As, Sb, Bi, Ge, etc. volatilize into the dust, and the kiln slag is magnetically ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C25C1/06C22B30/06C22B30/02C25C1/16
CPCC22B7/007C22B7/04C22B30/02C22B30/06C25C1/06C25C1/16Y02P10/20
Inventor 李世平钟波
Owner 六盘水中联工贸实业有限公司
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