Arsenic removal method of yellow phosphorus

A yellow phosphorus and arsenic removal technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of low safety, low arsenic removal rate, and low yellow phosphorus yield.

Active Publication Date: 2014-04-16
YUNNAN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Existing documents such as patents S52-160060, HEI5-43210, WO99 / 62819, CN13 15289, CN1257040, etc. have reported some aqueous phase oxidative arsenic removal methods, but in the treatment In the process, there are defects such as low arsenic removal rate, low yield of yellow phosphorus, low safety, complex process, or poor economy.

Method used

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  • Arsenic removal method of yellow phosphorus

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Add 30g of yellow phosphorus (arsenic content 207mg / kg) and 150g of hydrogen peroxide (1%) into the reactor with heating and stirring, and raise the temperature to 45-50°C. Then add 0.05g of elemental iodine, start stirring at a rate of 400rpm, control the reaction temperature at 50°C, drop in 165g of 30% (by weight) hydrogen peroxide, and finish dropping in 1 hour. After the hydrogen peroxide is dropped, the reaction liquid is cooled and the yellow phosphorus is separated. Finally, 150 g of 6% hydrogen peroxide was used to wash the reacted yellow phosphorus for 30 minutes to obtain 28.8 g of low-arsenic yellow phosphorus with a yield of 96%. After testing, the arsenic content in low-arsenic yellow phosphorus is 16mg / kg, and the removal rate is 92.3%.

Embodiment 2

[0037] Add 30g of yellow phosphorus (arsenic content 207mg / kg) and 150g of hydrogen peroxide (3%) into the reactor with heating and stirring, and raise the temperature to 45-50°C. Then add 0.03g of elemental iodine, start stirring at a rate of 400rpm, control the reaction temperature at 60°C, drop in 165g of 30% (by weight) hydrogen peroxide, and finish dropping in 1 hour. After the hydrogen peroxide is dropped, the reaction liquid is cooled and the yellow phosphorus is separated. Finally, 150 g of 6% hydrogen peroxide was used to wash the reacted yellow phosphorus for 30 minutes to obtain 28.5 g of low-arsenic yellow phosphorus with a yield of 95%. After testing, the arsenic content in low-arsenic yellow phosphorus was 14mg / kg, and the removal rate was 93.2%.

Embodiment 3

[0039] Add 30g of yellow phosphorus (arsenic content 207mg / kg) and 180g of hydrogen peroxide (6%) into the reactor with heating and stirring, and raise the temperature to 45-50°C. Then add 0.1g of elemental iodine, start stirring at a stirring rate of 500rpm, control the reaction temperature at 70°C, drop in 210g of 20% (weight) hydrogen peroxide, and finish dropping in 1.5h. After the hydrogen peroxide is dropped, the reaction liquid is cooled and the yellow phosphorus is separated. Finally, 150 g of 6% hydrogen peroxide was used to wash the reacted yellow phosphorus for 30 minutes to obtain 27.9 g of low-arsenic yellow phosphorus with a yield of 93%. After testing, the arsenic content in low-arsenic yellow phosphorus was 22mg / kg, and the removal rate was 89.4%.

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Abstract

The invention discloses an arsenic removal method of yellow phosphorus, belonging to the technical field of inorganic phosphorus chemical industry. The arsenic removal method is characterized by comprising the following steps: at first, adding a certain quantity of yellow phosphorus and hydrogen peroxide or nitric acid into a reaction kettle, and heating to 45-50 DEG C to melt yellow phosphorus into liquid; then, adding a certain quantity of elemental iodine into the reaction kettle, stirring, dropwise adding a certain quantity of hydrogen peroxide or nitric acid, reacting at 50-100 DEG C for 1-2 hours, cooling, and separating yellow phosphorus; finally, washing yellow phosphorus after the reaction by hydrogen peroxide with the mass concentration of 6% to obtain low-arsenic yellow phosphorus.

Description

technical field [0001] The invention relates to a method for removing arsenic from yellow phosphorus. It belongs to the field of inorganic phosphorus chemical industry. Background technique [0002] Yellow phosphorus is an important chemical raw material. In some specific application fields, such as: pharmaceutical intermediates and electronic materials such as indium phosphide and gallium phosphide, yellow phosphorus requires high purification. Industrial grade yellow phosphorus contains a variety of trace impurities, such as: iron, arsenic, antimony, silicon, sulfur, organic matter (commonly known as oil), etc., depending on factors such as production raw materials and working conditions, arsenic mainly exists in phosphate rock as arsenate In rock, because phosphorus and arsenic belong to two adjacent elements of the same main group, many physical and chemical properties are similar. In the process of phosphorus production by electric furnace method, arsenic is also redu...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C01B25/047
Inventor梁雪松肖勇吴立群
OwnerYUNNAN CHEM RES INST