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A method for removing arsenic from arsenic dust

An arsenic fume and arsenic removal technology, applied in chemical instruments and methods, arsenate/arsenite, arsenic compounds, etc., can solve the problems of valuable metals, long process, difficult to completely capture arsenic fume, etc. Achieve the effect of saving energy consumption and simple and easy process

Active Publication Date: 2021-07-02
云南锡业研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The characteristics are simple and efficient, but the arsenic-containing smoke generated by it often contains a certain amount of valuable metals, and the sand also contains a certain amount of unvolatile arsenic, which needs further treatment
In addition, due to the defect of the dust collection system, it is difficult to completely capture the arsenic-containing smoke and dust, and there is a risk of secondary pollution
[0004] (2) Wet method: Wet method can be divided into acid leaching, alkali leaching, and water leaching. After leaching, acidic, alkaline, and neutral leaching solutions can be obtained. Currently, there are treatment methods for all arsenic-containing fumes, but There are disadvantages of long process, high cost and secondary pollution

Method used

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  • A method for removing arsenic from arsenic dust

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Experimental program
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Effect test

Embodiment 1

[0027] A method for wet treatment of arsenic-containing smoke, the treatment method is as follows:

[0028] (1) leaching 500g of arsenic-containing smoke and dust containing 13.3% arsenic, 26.6% tin, 2.72% indium, and 7.95% lead, using sodium hydroxide and sodium chlorate, leaching conditions: sodium hydroxide concentration 80g / L, liquid-solid volume The mass ratio is 10:1 (ml:g), the reaction temperature is 90°C, the amount of sodium chlorate is 0.3 times the mass of arsenic in the flue dust, and the reaction time is 4 hours to obtain 4.8L of sodium arsenate solution and leaching residue. Add water to wash and filter to obtain 326g of tin concentrate containing 40.5% Sn, 4.15% indium and 1.37% arsenic;

[0029] (2) The leachate was cooled to 20-25° C., filtered and separated to obtain 4.6 L of crystallization mother liquor containing 2.1 g / L of arsenic and 5.72 g / L of lead, and 325 g of sodium arsenate with a content of 91.6%;

[0030] (3) Add 2 times the theoretical amount ...

Embodiment 2

[0032] A method for wet treatment of arsenic-containing smoke, the treatment method is as follows:

[0033] (1) leaching 500g of arsenic-containing smoke dust containing 19.8% of arsenic, 24.3% of tin, 3.2% of indium, and 6.6% of lead, using sodium hydroxide and potassium permanganate, leaching conditions: sodium hydroxide concentration 200g / L, liquid-solid The volume-to-mass ratio is 6:1 (ml:g), the reaction temperature is 95°C, the reaction time is 2 hours, and the amount of potassium permanganate is 0.5 times the mass of arsenic in the smoke to obtain 2.85L of sodium arsenate solution and 312g of leaching residue. The leaching residue was washed with water, filtered to obtain a tin concentrate containing 39.6% of Sn, 5.1% of indium, and 1.48% of arsenic;

[0034] (2) Cooling and crystallization of the leachate, the leachate was cooled to 20-25°C, filtered and separated to obtain 2.65L crystallization mother liquor containing 3.2g / L arsenic and 8.7g / L lead, and 508g of sodiu...

Embodiment 3

[0037] A method for wet treatment of arsenic-containing smoke, the treatment method is as follows:

[0038] (1) 500g of arsenic-containing fumes containing 10.2% of arsenic, 28.8% of tin, 3.5% of indium, and 5.3% of lead are leached with sodium hydroxide and hydrogen peroxide, leaching conditions: leaching conditions: sodium hydroxide concentration 150g / L, liquid-solid The volume to mass ratio is 4:1 (ml:g), the reaction temperature is 60°C, the reaction time is 6 hours, the amount of hydrogen peroxide is 0.6 times the mass of arsenic in the smoke, and 1.86L of sodium arsenate solution and 324g of leaching residue are obtained. The leaching residue is water After washing and filtering, a tin concentrate containing 43.9% tin, 5.35% indium and 1.18% arsenic was obtained;

[0039] (2) Cooling and crystallization of the leachate, the leachate was cooled to 20-25°C, filtered and separated to obtain 1.65L crystallization mother liquor containing 2.5g / L of arsenic and 10.6g / L of lead...

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Abstract

A method for removing arsenic from arsenic-containing fume, wherein the arsenic-containing fume contains 10-20% of arsenic, 20-30% of tin, 3% of indium, and 5-8% of lead; Steps such as permanent leaching, cooling and crystallization of the leachate, recovery of lead from the crystallization mother liquor, etc. The invention can effectively separate the arsenic from the tin and indium in the arsenic-containing dust, and can also produce the sodium arsenate product at the same time.

Description

technical field [0001] The invention belongs to the technical field of harmful smoke and dust treatment in hydrometallurgy and chemical production, and in particular relates to a treatment method for arsenic-containing smoke and dust. Background technique [0002] During the tin smelting process, arsenic forms an arsenic-containing fume containing 10-20% arsenic, 20-30% tin, 3% indium and 5-8% lead in the system. Most of the tin and arsenic in this kind of smoke exist in the form of oxides, which need to be treated separately for arsenic removal. Due to the high toxicity of arsenic, under strict environmental protection policies, how to deal with high-arsenic materials in a safe and environmentally friendly manner is a difficult problem for enterprises. Due to the complex and fluctuating components of arsenic-containing smoke and dust, and the large differences in phases, it is difficult to have a single treatment process. At present, there are mainly fire roasting for arsen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/11C22B7/02C22B30/04C22B13/00C01G28/02
CPCC01G28/023C22B1/11C22B7/008C22B7/02C22B13/045C22B30/04Y02P10/20
Inventor 张旭苏瑞春刘会讲李发祥
Owner 云南锡业研究院有限公司
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