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Method for preparing arsenic trioxide by arsenic-containing waste water

A technology of arsenic trioxide and sodium hydroxide, which is applied in chemical instruments and methods, arsenic compounds, solid waste removal, etc., can solve problems such as pollution and endangering people's life and health, and achieve cost reduction, no secondary pollutants, and arsenic recovery high rate effect

Inactive Publication Date: 2011-07-06
马艳荣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For a long time, most of the arsenic-containing waste residues have been treated by hoarding and storage. With the accumulation of high-concentration arsenic-containing wastes, the arsenic-containing waste residues have caused soil and river pollution, and the phenomenon of endangering people's life and health has become more and more serious.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing arsenic trioxide from arsenic sulfide waste residue, comprising the following specific steps:

[0020] Step A: Take arsenic sulfide waste residue with arsenic sulfide content of 10%, mix it with water, the water consumption is calculated as 120ml / 100g arsenic sulfide waste residue, after mixing evenly, add sodium hydroxide solution to extract arsenic sulfide, wherein the amount of sodium hydroxide According to 3.0g / g arsenic sulfide, after leaching for 1 hour, filter to obtain filtrate 1 and filter residue 1; neutralize the alkali in filtrate 1 with concentrated sulfuric acid to make the pH of the solution 10, and then filter to obtain filtrate 2 and filter residue two; the filtrate two is further neutralized with concentrated sulfuric acid to have a pH value of 2.5, and sodium sulfide is added to make the pH 3, and then filtered to obtain filter residue three and filtrate three; the filter residue is washed and dried to obtain purified arsenic sul...

Embodiment 2

[0026] A method for preparing arsenic trioxide from arsenic sulfide waste residue, comprising the following specific steps:

[0027] Step A: Take arsenic sulfide waste residue with arsenic sulfide content of 20%, mix it with water, the water consumption is calculated as 150ml / 100g arsenic sulfide waste residue, after mixing evenly, add sodium hydroxide solution to extract arsenic sulfide, wherein the amount of sodium hydroxide According to 3.5g / g arsenic sulfide, after leaching for 2 hours, filter to obtain filtrate 1 and filter residue 1; neutralize the alkali in filtrate 1 with concentrated sulfuric acid to make the pH of the solution 11, and then filter to obtain filtrate 2 and filter residue 1; Filter residue 2; filtrate 2 is further neutralized with concentrated sulfuric acid to a pH of 3.5, adding sodium sulfide to make the pH 4, and then filtering to obtain filter residue 3 and filtrate 3; the filter residue is washed and dried to obtain purified arsenic sulfide;

[002...

Embodiment 3

[0033] A method for preparing arsenic trioxide from arsenic sulfide waste residue, comprising the following specific steps:

[0034] Step A: Take arsenic sulfide waste residue with arsenic sulfide content of 5%, mix it with water, the water consumption is calculated as 100ml / 100g arsenic sulfide waste residue, after mixing evenly, add sodium hydroxide solution to extract arsenic sulfide, wherein the amount of sodium hydroxide According to 2.0g / g arsenic sulfide, after leaching for 0.5 hours, filter to obtain filtrate 1 and filter residue 1; neutralize the alkali in filtrate 1 with concentrated sulfuric acid to make the pH of the solution 9, and then filter to obtain filtrate 2 and filter residue 1; filter residue 2; filtrate 2 is further neutralized with concentrated sulfuric acid to pH 1, and sodium sulfide is added to make the pH 2, and then filtered to obtain filter residue 3 and filtrate 3; the filter residue is washed and dried to obtain purified arsenic sulfide;

[0035]...

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Abstract

The invention provides a method for preparing arsenic trioxide by arsenic-containing waste water, which comprises the steps of: mixing arsenic sulfide waste residue with water, and extracting arsenic sulfide by sodium hydroxide solution; mixing the obtained arsenic sulfide with the water with 2-5 times of the weight of the arsenic sulfide to be sizing agent, and reacting with copper sulfate solution to obtain arsenous acid and copper sulphide-containing precipitate and sulfuric acid solution; mixing the arsenous acid and copper sulphide-containing precipitate with the water to feed the oxygen, oxygenizing arsenious acid to generate arsenic acid which is easy to dissolve in water, and filtering to obtain arsenic acid solution and copper sulphide precipitate; restoring the obtained arsenic acid to be arsenious acid by sulfur dioxide to obtain arsenious acid; and distilling the arsenious acid, concentrating, filtering and drying to obtain an arsenic trioxide product. The method is short in technological process, high in arsenic recovery rate, free of the generation of secondary pollutant, simple in equipment, and extremely lower in arsenic recovery cost, thereby being a method which is worth to popularize and apply.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization and treatment of arsenic-containing wastewater, in particular to a method for preparing arsenic trioxide from arsenic-containing wastewater. Background technique [0002] For a long time, most of the arsenic-containing waste residues have been treated by hoarding and storage. With the accumulation of high-concentration arsenic-containing wastes, the arsenic-containing waste residues have caused soil and river pollution, and the phenomenon of endangering people's life and health has become more and more serious. In order to prevent secondary pollution, it is necessary to treat the arsenic sulfide waste residue. [0003] In particular, after years of mining, arsenic ore resources have been extremely limited. Due to the special use of arsenic in agriculture, electronics, medicine, metallurgy, chemical industry and other fields, it can be used to prepare herbicides, wood preservativ...

Claims

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Application Information

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IPC IPC(8): C01G28/00B09B3/00
Inventor 马艳荣
Owner 马艳荣
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