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Selective oxidation-reduction method for recycling arsenic and antimony from arsenic-antimony smoke

A selective and arsenic recovery technology, applied in the direction of improving process efficiency, can solve the problems of high economic cost, strict requirements for environmental protection and safety measures, and high technical requirements, and achieves the effect of simple process and good industrial application prospects.

Inactive Publication Date: 2014-02-26
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fire separation, the most commonly used method is vacuum distillation, which separates arsenic and antimony by using its different boiling point properties. Although this method can efficiently s

Method used

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  • Selective oxidation-reduction method for recycling arsenic and antimony from arsenic-antimony smoke
  • Selective oxidation-reduction method for recycling arsenic and antimony from arsenic-antimony smoke
  • Selective oxidation-reduction method for recycling arsenic and antimony from arsenic-antimony smoke

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] like figure 2 Shown, this selective oxidation-reduction method reclaims the method for arsenic and antimony in the arsenic and antimony smoke dust, and its concrete steps are as follows:

[0028] (1) Selective oxidation recovery of arsenic: Introduce an oxidizing gas with a flow rate of 0.01L / min into the arsenic-antimony fume (the arsenic-antimony fume includes the following components by mass percentage: the arsenic content is 5%, and the antimony content is 30%) , at a temperature of 400°C for 20 minutes, during which the As 2 o 3 Volatile flue gas is collected, and the secondary antimony-containing material is obtained after the reaction is completed, wherein the oxidizing gas is air, As 2 o 3 The collection of volatile flue gas adopts bag dust collection;

[0029] (2) Recover antimony: Add reducing agent to the secondary antimony-containing material obtained in step (1) according to the mass ratio of secondary antimony-containing material to reducing agent is ...

Embodiment 2

[0032] like figure 2 Shown, this selective oxidation-reduction method reclaims the method for arsenic and antimony in the arsenic and antimony smoke dust, and its concrete steps are as follows:

[0033] (1) Selective oxidation recovery of arsenic: Introduce an oxidizing gas with a flow rate of 0.5L / min into the arsenic-antimony fume (the arsenic-antimony fume includes the following mass percentage components: the arsenic content is 20%, and the antimony content is 60%) , reacted at a temperature of 800°C for 90min, during which the As 2 o 3 Volatile flue gas is collected, and the secondary antimony-containing material is obtained after the reaction is completed, wherein the oxidizing gas is oxygen-enriched air, and the As 2 o 3 The collection of volatile flue gas adopts bag dust collection;

[0034] (2) Recovering antimony: add a reducing agent to the secondary antimony-containing material obtained in step (1) according to the mass ratio of the secondary antimony-containi...

Embodiment 3

[0037] like figure 2 Shown, this selective oxidation-reduction method reclaims the method for arsenic and antimony in the arsenic and antimony smoke dust, and its concrete steps are as follows:

[0038] (1) Selective oxidation recovery of arsenic: Introduce an oxidizing gas with a flow rate of 0.4L / min into the arsenic-antimony fume (the arsenic-antimony fume includes the following components by mass percentage: the arsenic content is 15%, and the antimony content is 40%) , react at a temperature of 600°C for 70min, during which the As 2 o 3 Volatile flue gas is collected, and the secondary antimony-containing material is obtained after the reaction is completed, wherein the oxidizing gas is oxygen, and As 2 o 3 The collection of volatile flue gas adopts bag dust collection;

[0039] (2) Recovering antimony: add a reducing agent to the secondary antimony-containing material obtained in step (1) according to the mass ratio of the secondary antimony-containing material to t...

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Abstract

The invention relates to a selective oxidation-reduction method for recycling arsenic and antimony from arsenic-antimony smoke, belonging to the field of nonferrous metallurgy technologies. The method comprises steps of firstly, selectively oxidizing and recycling arsenic: introducing oxidizing gas into arsenic-antimony smoke, reacting for 20-90 minutes at 400-800 DEG C, collecting the As2O3 volatile smoke in reaction; after reaction is completed, obtaining a secondary material containing antimony; then reducing and recycling antimony: adding a reducing agent into the secondary material containing antimony (obtained in the former step), reacting for 30-180 minutes at 800-1000 DEG C, thus obtaining crude antimony. Based on the characteristics that arsenic trioxide is easy to volatilize and antimony tetroxide is difficult to volatilize at a low temperature, the selective oxidation-reduction method has the beneficial effects that selective oxidization is carried out on the arsenic-antimony smoke, arsenic is volatilized, separated and removed, and finally reduction smelting is carried out so as to obtain the crude antimony; therefore, the method is simple and has good industrial application prospect.

Description

technical field [0001] The invention relates to a method for recovering arsenic and antimony in arsenic and antimony dust by a selective oxidation-reduction method, and belongs to the technical field of nonferrous metallurgy. Background technique [0002] In the process of heavy metal smelting and recovery of precious metals, the dust generated often contains high arsenic and antimony, which are valuable secondary resources. In order to comprehensively utilize valuable metals and reduce environmental pollution, it is of great significance to increase the research on the separation technology of arsenic and antimony. [0003] At present, there are two methods for the separation of arsenic and antimony: fire method and wet method. In fire separation, the most commonly used method is vacuum distillation, which separates arsenic and antimony by using its different boiling point properties. Although this method can efficiently separate arsenic and antimony, it has high technical...

Claims

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Application Information

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IPC IPC(8): C22B30/02C22B30/04C22B7/02
CPCY02P10/20
Inventor 李磊廖彬王华邱在军
Owner KUNMING UNIV OF SCI & TECH
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