Arsenic alkaline residue treatment system and method for treating arsenic alkaline residues by using arsenic alkaline residue treatment system

A disposal system and technology of arsenic-alkali slag, which is applied in the field of comprehensive resource utilization, can solve the problems of cost reduction and high processing cost, and achieve the effects of cost reduction, good processing effect and safe disposal

Active Publication Date: 2019-03-08
湖南省环境保护科学研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, people have paid great attention to air pollution. As one of industrial gas pollutants, sulfur dioxide is usually treated by desulfurization, but the cost of treatment is relatively high, causing polluters to avoid desulfurization treatment in order to reduce costs.

Method used

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  • Arsenic alkaline residue treatment system and method for treating arsenic alkaline residues by using arsenic alkaline residue treatment system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] use figure 1 The shown arsenic-alkali slag disposal system performs arsenic-alkali slag treatment.

[0049] Send the original arsenic-alkali slag to the feeding pretreatment unit 1 for ball milling and crushing, with a solid-to-liquid ratio of 1:1 to obtain first-grade arsenic-alkali slag.

[0050] The primary arsenic-alkali slag is sent to the leaching unit 2, and is leached in the first leaching tank 21 using an acidic aqueous solution with a temperature of 20°C, containing sulfite ions, and a pH less than or equal to 6, to obtain a primary leachate and a primary precipitate. The primary leachate is input into the spray unit 3, the primary sediment is sieved by a grading sieve 23, the oversize is returned to the feeding pretreatment unit 1 for secondary ball milling and then circulated, and the undersize is input into the second leaching tank 22. Water at a temperature of 30° C. is used for leaching to obtain a secondary leachate and a secondary precipitate, and the ...

Embodiment 2

[0054] use figure 1 The shown arsenic-alkali slag disposal system performs arsenic-alkali slag treatment.

[0055] Send the original arsenic-alkali slag to the feeding pretreatment unit 1 for ball milling and crushing, with a solid-to-liquid ratio of 1:1 to obtain first-grade arsenic-alkali slag.

[0056] The primary arsenic-alkali slag is sent to the leaching unit 2, and is leached in the first leaching tank 21 with an acidic aqueous solution with a temperature of 30°C, containing sulfite ions, and a pH less than or equal to 6 to obtain a primary leachate and a primary precipitate. The primary leachate is input into the spray unit 3, the primary sediment is sieved by a grading sieve 23, the oversize is returned to the feeding pretreatment unit 1 for secondary ball milling and then circulated, and the undersize is input into the second leaching tank 22. Use water at a temperature of 20°C for leaching to obtain a secondary leachate and a secondary precipitate, and the secondar...

Embodiment 3

[0063] use figure 1 The shown arsenic-alkali slag disposal system performs arsenic-alkali slag treatment.

[0064] Send the original arsenic-alkali slag to the feeding pretreatment unit 1 for ball milling and crushing, with a solid-to-liquid ratio of 1:1 to obtain first-grade arsenic-alkali slag.

[0065] The primary arsenic-alkali slag is sent to the leaching unit 2, and is leached in the first leaching tank 21 using an acidic aqueous solution with a temperature of 25°C, containing sulfite ions, and a pH less than or equal to 6 to obtain a primary leachate and a primary precipitate. The primary leachate is input into the spray unit 3, the primary sediment is sieved by a grading sieve 23, the oversize is returned to the feeding pretreatment unit 1 for secondary ball milling and then circulated, and the undersize is input into the second leaching tank 22. Use water at a temperature of 25°C for leaching to obtain a secondary leachate and a secondary precipitate, and the seconda...

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Abstract

The invention provides an arsenic alkaline residue treatment system and a method for treating arsenic alkaline residues by using the arsenic alkaline residue treatment system. The arsenic alkaline residue treatment system comprises a feeding pretreatment unit, a leaching unit, a spraying unit and a beneficiation smelting unit. The method for treating the arsenic alkaline residues by using the arsenic alkaline residue treatment system comprises the following steps that original arsenic alkaline residues are fed into the feeding pretreatment unit to be crushed to obtain first-level arsenic alkaline residues; the first-level arsenic alkaline residues are leached in a first leaching tank to obtain leachate and precipitates, the leachate is input into the spraying unit, the precipitates are input into a grading sieve for sieving, oversize substances are input into the feeding pretreatment unit, undersize substances are input into the leaching tank for leaching to obtain the leachate and theprecipitates, and the leachate is input into the spraying unit; the precipitates are input into the beneficiation smelting unit to recover antimony; and the leachate reacts with flue gas containing sulfur dioxide in the spray unit to obtain neutralizing liquid. The arsenic alkaline residue treatment system and the method for treating the arsenic alkaline residues by using the arsenic alkaline residue treatment system combine arsenic alkaline residue treatment with desulfurization, do not use sulfuric acid, realize the recycling and safe treatment of antimony resources, and have good environmental and economic benefits.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of resources, in particular to an arsenic-alkali slag disposal system and a method for using it to treat arsenic-alkali slag. Background technique [0002] In the pyrometallurgy process of antimony ore, arsenic will gradually enrich, so it is necessary to remove arsenic to produce refined antimony. Antimony ore will be depleted of arsenic in the process of hydrometallurgy. To obtain commercial-grade refined antimony, no matter it is pyrometallurgy or hydrometallurgy, alkaline refining is required, which will inevitably produce arsenic-alkali slag. The main components of arsenic-alkali slag are sodium sulfite, sodium arsenate, excess sodium carbonate and metal antimony. It is particularly important to recover antimony from the arsenic-alkali slag and treat the arsenic-alkali slag to prevent secondary pollution to the environment. [0003] In recent years, people have paid great attention ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/11C22B30/02
CPCC22B1/11C22B7/006C22B7/007C22B30/02Y02P10/20
Inventor 余志元李二平陈浩云黄启富李希山熊如意赵雄飞王亲雄石泽华
Owner 湖南省环境保护科学研究院
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