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Method for removing arsenic from smoke containing arsenic trioxide

A technology for arsenic trioxide and arsenic removal, which is applied in the field of arsenic removal from dust containing arsenic trioxide, can solve problems such as complex process, and achieve the effect of simple process flow and pollution reduction

Inactive Publication Date: 2008-06-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the arsenic contained in the solution obtained by this method is still highly toxic +3-valent arsenic, and the process is relatively complicated, and further oxidation treatment is required in the subsequent lime arsenic precipitation treatment

Method used

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  • Method for removing arsenic from smoke containing arsenic trioxide
  • Method for removing arsenic from smoke containing arsenic trioxide
  • Method for removing arsenic from smoke containing arsenic trioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: 100 grams of zinc oxide material, 10 ml of hydrogen peroxide; leaching temperature: 23° C.; leaching time: 3 hours; pH of the solution was adjusted to 11 with NaOH; L / S was 3:1.

[0026] The arsenic removal rate reaches 83.6%, [Pb]5+ form exists.

Embodiment 2

[0027] Example 2: 100 grams of zinc oxide material, the amount of hydrogen peroxide added is 20ml; leaching temperature: 29°C; leaching time: 3h; use Na 2 CO 3 Adjust the pH of the solution to 9; L / S to 5:1.

[0028] The arsenic removal rate reaches 83.3%, [Pb]5+ form exists.

Embodiment 3

[0029] Example 3: 100 grams of zinc oxide material, 15 ml of hydrogen peroxide; leaching temperature: 75° C.; leaching time: 1 hour; adjust the pH of the solution to 5.0 with ammonia water; L / S is 4:1.

[0030] The arsenic removal rate reaches 84.1%, [Pb]5+ form exists.

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PUM

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Abstract

An arsenic removal method from smoke dust containing As2O3 is provided, which is suitable for the arsenic removal treatment of smoke dust that exists in form of As2O3, etc. The method is to use sodium hydroxide, sodium carbonate or ammonia to regulate the pH value of leaching solution to be 5-12 and the liquid-solid weight ratio to be 2-10 to 1. Hydrogen peroxide is added for the leaching under the stirring condition. The addition amount of the hydrogen peroxide is 100-300 percent of the chemical reaction measurement. The leaching temperature is 20-100 DEG C. The leaching time is 1-10 hours. The arsenic is dissolved in the solution. And the arsenic removal rate can reach to 80 percent above. The concentration of valuable elements in the solution is low and the most are reserved in slag.

Description

technical field [0001] The invention relates to a method for removing arsenic from flue dust by non-roasting method. Background technique [0002] In the industrial production of zinc extraction, the dust produced by the fuming furnace contains zinc, lead, germanium, arsenic, etc., of which arsenic is mainly composed of As 2 o 3 In order to recover zinc, lead and germanium, the dust is usually returned to the sintering process as ingredients, resulting in the continuous enrichment of arsenic in the system. Therefore, how to remove arsenic damage is an urgent problem to be solved in production. [0003] At present, there are some methods for removing arsenic from arsenic-containing materials. As disclosed in the Chinese patent CN96112949.2, "the process of removing arsenic from high-arsenic materials" introduces the method of using sodium hydroxide reagent to process high-arsenic materials. It is to mix the NaOH aqueous solution with the high-arsenic materials, and the soli...

Claims

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Application Information

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IPC IPC(8): C22B3/12C22B3/44C22B30/04
CPCY02P10/20
Inventor 李启厚刘志宏李玉虎
Owner CENT SOUTH UNIV
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