Method for preparing arsenic trioxide by using arsenic-containing waste water

A technology for arsenic trioxide and waste water, applied in chemical instruments and methods, arsenic compounds, inorganic chemistry, etc., can solve the problem of high production cost, and achieve the effect of reducing treatment cost, saving raw materials, and achieving significant environmental benefits

Inactive Publication Date: 2008-02-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Therefore, the production cost of arsenic recove

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 5m 3 Arsenic content is 6.2g L -1 A smelter in China washed wastewater with sulfur dioxide, adjusted the pH of the wastewater to 6.0 with milk of lime, stirred for 2 hours, and filtered to obtain gypsum slag and arsenic-containing solution. According to the ratio of copper: arsenic substance ratio of 1.17, add 120kg copper sulfate pentahydrate to the arsenic-containing solution, stir to make it fully dissolved, add sodium hydroxide to adjust the pH value of the solution to 8.0, filter and wash after dense sedimentation to obtain Green copper arsenite precipitates.

[0030] Use 4 times the volume of water to adjust the green filter residue copper arsenite into a slurry, and pass through SO 2 , the reaction causes more than 95% of the arsenic to be transferred into the solution and then filtered to obtain the arsenous acid solution and the red filter residue containing copper. Evaporate and concentrate the arsenous acid solution, crystallize, filter and dry to obt...

Embodiment 2

[0034] Take 2m 3 The arsenic content in a smelter is 4.4g·L -1 30 kg of solid sodium hydroxide was used to adjust the pH of the solution to 7.0, and after stirring and reacting for 1 hour, it was filtered to obtain filter residue and arsenic-containing solution. According to the ratio of copper: arsenic substance amount of 1.20, add 35kg copper sulfate pentahydrate to the arsenic-containing solution, stir to make it fully dissolved, add sodium hydroxide to adjust the pH value of the solution to 10.0, and stir the reaction under this condition After 0.5h, filter and wash to obtain green copper arsenite precipitate.

[0035] Use 4 times the volume of water to adjust the green copper arsenite precipitate into a slurry, and pass through SO 2 The reaction causes more than 96% of the arsenic to be transferred into the solution, and the arsenous acid solution and the red filter residue containing copper are obtained by filtration. The arsenous acid solution was evaporated and conc...

Embodiment 3

[0038] Take 5m 3 Arsenic content is 6.2g L -1 A smelter in China washes wastewater with sulfur dioxide, adjusts the pH of the wastewater to 2.0 with milk of lime, and then filters to obtain gypsum slag and arsenic-containing filtrate. Then use solid sodium hydroxide to adjust the pH of the solution to 6.0, stir and react for 1 hour, and then filter to obtain an arsenic-containing solution.

[0039] Add the copper sulfate solution obtained in Example 1 to the arsenic-containing solution, stir to make it fully dissolved, add sodium hydroxide to adjust the pH value of the solution to 6.0, filter and wash after dense sedimentation to obtain green copper arsenite precipitate.

[0040] Use 4 times the volume of water to adjust the green filter residue copper arsenite into a slurry, and pass through SO 2After the reaction, more than 95% of the arsenic is transferred into the solution and then filtered to obtain the arsenous acid solution and the red filter residue containing copper...

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Abstract

The invention relates to a method to produce arsenic trioxide with waste water containing arsenium, which takes waste water containing arsenium as raw material to produce arsenic trioxide. A. alkali is added to remove impurities, cupric salt is added, the pH value of the solution is adjusted to 4-14 by alkali and green copper arsenite or copper arsenate precipitate is prepared; B. the prepared green copper arsenite or copper arsenate precipitate is made into slurry by water or sulphuric acid solution; sulfur dioxide is pumped into or sulphite is added to be reacted, arsenious acid solution and pink filtration residue are obtained after filtration; C. arsenious acid solution is crystallized, filtered and dried to get arsenic trioxide powder. The invention has the advantages of simple process, saving raw materials, reducing cost and high recovery yield.

Description

technical field [0001] The invention relates to the recycling and treatment technology of arsenic-containing wastewater, which is a method for preparing arsenic trioxide from arsenic-containing wastewater. Background technique [0002] Arsenic and its compounds seriously damage human health, and have been identified as the first class of carcinogens by the Center for Disease Control and International Agency for Cancer Prevention in the United States. They mainly endanger 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. In recent years, with the rapid development of mining, metallurgy, ceramics, leather, pesticides and other industries, the amount of arsenic-containing wastewater is increasing, and the emission and pollution of arsenic to the environment are becoming more and more serious. [0003] The main methods for treating arsenic-containi...

Claims

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Application Information

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IPC IPC(8): C01G28/00C02F1/58
Inventor 郑雅杰罗园王勇
Owner CENT SOUTH UNIV
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