Method for removing arsenic and antimony from zinc smelting leach liquor

A technology for zinc smelting and leaching solution, applied in the field of zinc metallurgy, can solve problems such as comprehensive utilization of unfavorable valuable metals, low content of valuable elements, increase labor intensity, etc., and achieve high content of valuable metals, stable physical and chemical properties, and reduce acid consumption. Effect

Inactive Publication Date: 2014-07-09
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] The amount of slag produced by the alum method and the neutralization method is large, the content of valuable elements is low, and the composition is complex, which is not conducive to the comprehensive utilization of valuable metals; at present, no comprehensive recovery is carried out in the industry, but stockpiling is used, so that the It has a great impact on the environment and is also a waste of resources
Although the sulfidation precipitation method has a strong affinity for some ions, it can effectively settle arsenic, antimony, etc., increase the content of valuable elements in the slag, and provide an economic basis for its comprehensive recovery; but the sulfidation agent is easily formed in acidic solution Toxic hydrogen sulfide gas causes environmental pollution and increases labor intensity

Method used

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  • Method for removing arsenic and antimony from zinc smelting leach liquor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add Zn104g / L, Fe21g / L, In0.15g / L, As0.10g / L, Sb0.05g / L low-acid leaching solution to pre-reduce zinc concentrate, the amount of concentrate added is 1.2 times the theoretical amount, React at 95°C for 3 hours, the ferric iron in the reduced solution is about 0.9g / L, the reduction rate is 95.7%, and the reduced liquid is obtained by solid-liquid separation; at 90°C, limestone is slowly added to the reduced liquid to adjust the pH value of the solution, and wait for When the pH value of the solution is stable at about 1.0, continue to react for 120 minutes, and separate the solid and liquid to obtain a section of neutralized liquid; neutralize the residual acid with sub-zinc oxide at 90°C, control the pH value of the end point to about 4.5, and separate the solid and liquid to obtain indium-rich liquid after 2 hours of reaction slag and indium-precipitated liquid (ie, neutralized liquid); the indium-precipitated liquid was reacted for 3 hours at a temperature of 170°C, an ...

Embodiment 2

[0026] Add zinc sulfite to the low-acid leach solution of Zn104g / L, Fe21g / L, In0.15g / L, As0.15g / L, Sb0.1g / L for pre-reduction, and the amount of zinc sulfite added is 1.1 times of the theoretical amount , react at 95°C for 3 hours, the ferric iron in the reduced liquid is about 0.6g / L, the reduction rate is 97.1%, and the reduced liquid is obtained by solid-liquid separation; at 90°C, the calcined sand is slowly added to the reduced liquid to adjust the pH value of the solution , when the pH value of the solution is stabilized at about 1.0, continue to react for 120 minutes, and separate the solid and liquid to obtain a section of neutralized liquid; neutralize the residual acid with zinc oxide at 80 ° C, control the pH value of the end point to about 4.5, and separate the solid and liquid after 2 hours of reaction to obtain Indium-rich slag and indium-precipitated solution (neutralized solution); the indium-precipitated solution was reacted for 3 hours at a temperature of 120°...

Embodiment 3

[0028] Add zinc sulfite to the low-acid leach solution of Zn104g / L, Fe21g / L, In0.15g / L, As1g / L, and Sb1g / L for pre-reduction. The amount of zinc sulfite added is 1.1 times the theoretical amount, and the reaction is performed at 95°C After 3 hours, the ferric iron in the reduced liquid was about 0.6g / L, the reduction rate was 97.1%, and the reduced liquid was obtained by solid-liquid separation; at 90°C, zinc oxide was slowly added to the reduced liquid to adjust the pH value of the solution. When the value is stable at about 1.0, continue to react for 120 minutes, and obtain a section of neutralized liquid after solid-liquid separation; neutralize the residual acid with secondary zinc oxide at 90 ° C, control the pH value of the end point to about 4.5, and separate the solid-liquid after 2 hours to obtain indium-rich slag and The liquid after sinking indium (ie, the liquid after neutralization); react the liquid after sinking indium at a temperature of 170°C, an oxygen partial...

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Abstract

The invention discloses a method for removing arsenic and antimony from zinc smelting leach liquor, and relates to a method for removing arsenic and antimony from a solution produced during zinc smelting by purifying. The method is characterized by comprising the following steps: comprehensively recovering valuable components of zinc, indium, iron and the like by purifying in an arsenic and antimony removing process consisting of pre-reduction, neutralization of precipitated indium and a hematite process under the condition that zinc smelting low-acid leach liquor is taken as a raw material; turning high-valence iron into low-valence iron by taking zinc concentrate, zinc sulfite, sulfur dioxide and the like as reducing agents in the low-acid leach liquor, wherein the content of high-valence iron (Fe<3+>) in the reduced liquor is lower than 2g / L; performing two-stage neutralization by using lime, limestone, secondary zinc oxide, calcined sand and zinc oxide to regulate the pH value of reduced liquor to 4.0-5.4 in order to enrich indium precipitate; and removing arsenic and antimony from indium-precipitated liquor to fulfill the aim of efficiently cleaning and purifying the solution. The method has the advantages of high indium metal recovery rate, high arsenic and antimony removing rates, small residue amount, stable performance and environmental friendliness.

Description

technical field [0001] The invention belongs to the technical field of zinc metallurgy and relates to a method for removing arsenic and antimony from zinc smelting leachate. Background technique [0002] The main raw materials for zinc metallurgy are zinc sulfide concentrates obtained from sphalerite and high-iron sphalerite beneficiation, and a small amount of zinc ore, smithsonite, and hemimorphite. Zinc metallurgy processes are divided into two categories: pyrometallurgy and wet zinc smelting process. At present, more than 80% of the zinc smelting methods in the world are hydrometallurgical zinc smelting. Zinc hydrometallurgy is mainly divided into three categories: the first category is conventional leaching wet zinc smelting process, the second category is hot acid leaching zinc smelting process, and the third category is pressure leaching wet zinc smelting process. The main process of hot-acid wet zinc smelting is "roasting-leaching-purification-electrodeposition" of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B19/00C22B58/00
CPCY02P10/20
Inventor 蒋开喜张邦胜王海北蒋伟赵磊张磊邹小平刘三平王玉芳
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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