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Method for stabilizing iron arsenate slag

A technology of iron arsenate slag and iron arsenate, which is applied in the field of arsenic pollution control, can solve the problems of unmentioned arsenic-containing sludge treatment and complicated preparation process, and achieve the effects of low cost, simple preparation and wide sources

Active Publication Date: 2018-06-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned related patents all use iron-based preparations to adsorb arsenic, these adsorbent materials require complex preparation processes, and are mainly for the treatment of arsenic-containing wastewater, and do not mention the treatment of arsenic-containing sludge

Method used

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  • Method for stabilizing iron arsenate slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The method for stabilizing ferric arsenate slag of the present invention, concrete operation is as follows:

[0038] The stabilizer is zero-valent iron powder after ball milling, and the zero-valent iron powder is ball-milled for 1 hour to obtain ball-milled iron powder, the particle size of which is controlled at 35.8 μm; the iron arsenate slag comes from the product of A smelter after treating arsenic-containing wastewater, and the arsenic content is 22.12%, and the iron content is 22.6%.

[0039] Reaction solution: the concentration of acetic acid is 0.11mol / L, the concentration of chloride ion is 0.015mol / L (sodium chloride is added), the concentration of nitrate ion is 0.03mol / L (sodium nitrate is added), and the pH value is adjusted to 3.5 by sodium hydroxide , to obtain a reaction solution after stirring evenly.

[0040] Take 10g of ferric arsenate slag (dry basis) and 0.83g of ball-milled iron powder (the molar ratio of iron to arsenic is 0.5:1) in a conical fl...

Embodiment 2

[0043] The method for stabilizing ferric arsenate slag of the present invention, concrete operation is as follows:

[0044] The stabilizer is zero-valent iron powder after ball milling, and the zero-valent iron powder is ball-milled for 1.5 hours to obtain ball-milled iron powder, the particle size of which is controlled at 26.5 μm; the iron arsenate slag comes from the product of B smelter after treating arsenic-containing wastewater, and the arsenic The content is 15.2%, and the iron content is 15.9%.

[0045] Reaction solution: the concentration of acetic acid is 0.20mol / L, the concentration of chloride ion is 0.035mol / L (ammonium chloride is added), the concentration of nitrate ion is 0.015mol / L (ammonium nitrate is added), the pH value is adjusted to 5.7 with ammonia water, and stirred After uniformity, the reaction solution was obtained.

[0046]Take 10g of ferric arsenate slag (dry basis) and 0.57g of ball-milled iron powder (the molar ratio of iron to arsenic is 0.5:1...

Embodiment 3

[0049] The method for stabilizing ferric arsenate slag of the present invention, concrete operation is as follows:

[0050] The stabilizer is zero-valent iron powder after ball milling, and the zero-valent iron powder is ball-milled for 2 hours to obtain ball-milled iron powder, the particle size of which is controlled at 25.6 μm; iron arsenate slag is prepared by the laboratory, with arsenic content of 33.05%, iron The content is 23.07%, and it is naturally dried to a moisture content of 5%.

[0051] Reaction solution: the concentration of acetic acid is 0.10mol / L, the concentration of chloride ion is 0.025mol / L (potassium chloride is added), the concentration of nitrate ion is 0.025mol / L (potassium chloride), and the pH value is adjusted to 6.0 by potassium hydroxide. After stirring evenly, a reaction solution was obtained.

[0052] Take 10g of ferric arsenate slag (dry basis) and 1.24g of ball-milled iron powder (the molar ratio of iron to arsenic is 0.5:1) in a conical fl...

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Abstract

The invention discloses a method for stabilizing iron arsenate slag. The method comprises the following steps that (1), an iron-based stabilizer is added into the arsenic-containing waste residue, andmixing is carried out; (2), a reaction solution is added into the mixture, and stirring is carried out to prepare slurry; and (3), after the slurry is stirred under a certain condition, liquid-solidseparation is carried out, and the filtered product undergoes standing, air drying or drying dewatering, so that a stable product of the iron arsenate slag is obtained, and the filtrate is returned tothe reaction solution to be reused. The method has the advantages of being simple in process, easy to operate, low in auxiliary material cost, free of secondary pollution, small in capacity increasing ratio and the like; and the method can be directly applied to the final treatment and disposal of the iron arsenate slag.

Description

technical field [0001] The invention relates to a method for stabilizing ferric arsenate slag, which is a new technology for harmless arsenic-containing waste slag in the metallurgical industry, and belongs to the field of arsenic pollution control. Background technique [0002] Arsenic is a metalloid element known for its toxicity. Its man-made pollution sources mainly include non-ferrous metal smelting and fossil fuel combustion. Due to the strong toxicity of arsenic, the market for arsenic products is shrinking year by year, and a large amount of hazardous waste containing arsenic needs to be properly disposed of. Iron salt stabilization of arsenic is the mainstream arsenic pollution control technology. Its mechanism of stabilizing arsenic is: through the addition of iron-based stabilizers, the combination of free arsenic and iron ions is realized, and through the regulation of ore phases, stable arsenic-iron ore phases (such as skunk onion stone). However, in the actua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/33A62D101/43
CPCA62D3/33A62D2101/43
Inventor 梁彦杰闵小波马敬敬柴立元柯勇费讲驰史美清
Owner CENT SOUTH UNIV
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