Method for removing arsenic from arsenic-contained smoke

A technology for arsenic fume and dust removal, which is applied in the field of arsenic removal, can solve problems such as the failure of alkaline leaching to achieve selective arsenic leaching, high consumption of acid leaching reagents, long process flow, etc., to meet the requirements of clean production, low toxicity, and process short process effect

Active Publication Date: 2016-08-31
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the current public information, hydrometallurgy has the characteristics of high arsenic removal rate, but the consumption of acid leaching reagents is high, and the selective leaching of arsenic has not been realized by alkaline leaching. Because valuable metals such as lead are partially leached into the solution, the process Long process and many procedures

Method used

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  • Method for removing arsenic from arsenic-contained smoke

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Leach 40g of arsenic-containing dust (containing As 14.4%, Pb 17.7%, Cu 10.3%) with ammonia water and ammonium sulfide solution, the leaching liquid-solid ratio is 5:1, the concentration of ammonium sulfide is 100g / L, and the concentration of ammonia is 20g / L, the leaching time is 2h, the leaching rate of arsenic is 92.6%, and the leaching rate of lead and copper is less than 5%.

[0019] (2) The arsenic-containing leaching solution obtained in step (1) is evaporated at 90° C. to deammoniate, and the arsenic is precipitated in the form of arsenic sulfide to obtain arsenic sulfide precipitate containing 52.2% of arsenic.

[0020] (3) Absorb the ammonia produced by evaporation in step (2) and use it in step (1).

[0021] (4) Return the ammonia-distilled liquid in step (2) to step (1) to leach arsenic fumes.

Embodiment 2

[0023] (1) Leach 40g of arsenic-containing dust (containing As 11.2%, Pb 15.6%, Cu 8.5%) with ammonia water and ammonium sulfide solution, the leaching liquid-solid ratio is 4:1, the concentration of ammonium sulfide is 120g / L, and the concentration of ammonia is 20g / L, the leaching time is 2h, the leaching rate of arsenic is 91.2%, and the leaching rate of lead and copper is less than 5%.

[0024] (2) The arsenic-containing leaching solution obtained in step (1) is evaporated at 95° C. to deammoniate, and the arsenic is precipitated in the form of arsenic sulfide to obtain arsenic sulfide precipitate containing 51.6% of arsenic.

[0025] (3) Absorb the ammonia produced by evaporation in step (2) and use it in step (1).

[0026] (4) Return the ammonia-distilled liquid in step (2) to step (1) to leach arsenic fumes.

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Abstract

The invention provides a method for removing arsenic from arsenic-contained smoke, and belongs to the technical field of wet metallurgy. According to the method, arsenic is selectively leached out of the arsenic-contained smoke through ammonia and an ammonium sulfide solution, the arsenic is leached out to enter the solution, and valuable metal stays in residue; arsenic leaching liquid is subject to evaporation and deamination, and arsenic sulfide precipitation is obtained; ammonia generated through evaporation is absorbed and returns to leaching of the arsenic-contained smoke, and liquid obtained after ammonia evaporation returns to the leached-out arsenic-contained smoke; and according to the process, selective removing of arsenic is achieved, white arsenic obtained through volatizing of arsenic sulfide residue relative to the pyrogenic process is low in virulence, a reagent for leaching out is circularly used, and the method has the beneficial effects of being short in process flow and small in number of working procedures and can meet the clean production requirement.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for removing arsenic from arsenic-containing smoke. Background technique [0002] Most lead, zinc, copper, and tin smelting enterprises will produce arsenic-containing fumes during the smelting process. Such fumes generally also contain valuable metals such as copper, zinc, lead, tin, and silver. At present, there are mainly methods of pyrometallurgy and hydrometallurgy to deal with this kind of dust. The process of fire method for arsenic removal is to volatilize arsenic from the dust in the form of arsenic trioxide under high temperature conditions, and then process it after dust collection. The arsenic removal rate of the fire method is not high, and the flue gas treatment is prone to fail to meet the standard during the arsenic removal process, and the gaseous arsenic enters the atmosphere, causing secondary pollution. Other valuable metals such as zinc, le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B1/11C22B13/00C22B15/00
CPCC22B1/11C22B7/008C22B7/02C22B13/045C22B15/0078Y02P10/20
Inventor 王成彦陈永强邢鹏马保中
Owner UNIV OF SCI & TECH BEIJING
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