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Method for preparing arsenic trioxide by utilizing arsenious waste water

A technology for arsenic trioxide and wastewater, which is applied in chemical instruments and methods, arsenic compounds, heating water/sewage treatment, etc., and can solve the problems of demanding equipment and operating technical conditions, slow gas-liquid heterogeneous reaction rate, complex equipment and processes, etc. problems, achieving significant economic and environmental benefits, curbing emissions, and simple processes

Active Publication Date: 2012-07-25
HUNAN ZHANTAI NON FERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] SO 2 The main disadvantage of the reduction method is that SO 2 The solubility is small, the gas-liquid heterogeneous reaction rate is slow, the equipment and process are complex, the investment is large, and the reaction process has strict requirements on equipment and operating technical conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 200ml of an aqueous solution of a high-arsenic flue ash with an arsenic content of 23.2g / L, which has been acid-leached and recovered valuable metals, and add 7.52 g formaldehyde solution containing 37% formaldehyde, stirred and reacted for 1.5 hours at normal temperature and pressure, then the obtained arsenous acid solution was evaporated, crystallized, filtered, and dried to obtain 5.75 g of arsenic trioxide. The purity of arsenic trioxide in the product was 91.5%. Up to 86.32%. Then, the diarsenic trioxide was heated and sublimated to obtain 5.16 g of diarsenic trioxide, and the product had a purity of 99.1%. The filtrate is returned to the mother liquor for recycling.

Embodiment 2

[0029] Take 1m 3 The alkaline waste liquid with arsenic content of 6.2g / L (pH is about 9), according to the ratio of urea:arsenic substance amount of 12:1, add 6.0kg urea to the arsenic-containing solution, at 55 ℃, normal pressure Next, stir and react for 2 hours, then add 15kg of concentrated sulfuric acid to adjust the dissolved pH to 2.5. Then the obtained arsenous acid solution was evaporated, concentrated and crystallized, filtered and dried to obtain 7.72kg of arsenic trioxide, the purity of the arsenic trioxide in the product was 94.5%, and the recovery rate was 89.9%. Then the diarsenic trioxide was heated and sublimated to obtain 7.19 kg of diarsenic trioxide with a product purity of 99.4%. The filtrate will be harmlessly treated separately.

Embodiment 3

[0031] Take 200ml of neutral arsenate aqueous solution with an arsenic content of 23.0g / L, formaldehyde: the ratio of the amount of arsenic is 2:1, add 10g of formaldehyde solution containing 37% formaldehyde to the arsenic-containing aqueous solution, and heat at 120°C, Under the pressure of 0.15MPa, stir and react for 0.5 hours, add sulfuric acid to adjust the pH of the system to 1.5, evaporate and concentrate the obtained arsenous acid solution to 40ml, filter and dry the obtained crystals, and obtain 6.5g of crude product, in which the purity of arsenic trioxide is 90.3%. The rate reached 97.5%. Then the crude arsenic trioxide was heated and sublimated to obtain 5.9 g of arsenic trioxide with a product purity of 99.5%.

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PUM

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Abstract

The invention discloses a method for preparing arsenic trioxide by utilizing arsenious waste water. The method comprises the following steps of: adopting the arsenious waste water as a raw material, adding a water-soluble organic reducing agent such as low-grade fatty aldehyde and urea, reacting for 0.5-8 hours under the temperature of 15-150 DEG C and the pressure of 0.1-10MPa, reducing arsenateinto arsenite, then adding sulfuric acid for adjusting pH to be acid, enabling the arsenite to be converted into the arsenic trioxide which is precipitated, then evaporating and concentrating solution, filtering, drying, then carrying out heating sublimation or recrystallizing purification on the obtained arsenic trioxide, and then obtaining a high-purity arsenic trioxide product. The method disclosed by the invention has the advantages of simple process, easiness in implementation, lower cost, and high recovery rate and product purity.

Description

technical field [0001] The invention relates to a method for preparing diarsenic trioxide through comprehensive utilization and treatment of arsenic-containing aqueous solution discharged from non-ferrous metal smelters or chemical plants or arsenic-containing materials after acid, alkali or water treatment. Background technique [0002] Arsenic and its compounds seriously damage human health, and have been identified as the first class of carcinogens by the US Centers for Disease Control and National Cancer Research Institute, mainly endangering human health through drinking water. Therefore, China, the United States, Western Europe, Japan and many other countries have listed arsenic as one of the priority water pollutants. On the other hand, arsenic trioxide is a very important chemical raw material, which has been widely used in semiconductor, metallurgy, glass, pesticide, tanning, printing and dyeing, medicine and other industries. In recent years, with the massive deve...

Claims

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Application Information

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IPC IPC(8): C01G28/00C02F9/10C02F1/04
Inventor 符剑刚唐新村陈凯达王晖曹圣金曾冬铭曹峰潘春跃
Owner HUNAN ZHANTAI NON FERROUS METALS
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