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A method for resource utilization of silicon tetrachloride pollutants

A technology of silicon tetrachloride and pollutants, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of strong toxicity, large pollution of silicon tetrachloride pollutants, high treatment costs, etc.

Active Publication Date: 2021-11-12
东阳市前途工业设计有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Silicon tetrachloride pollutants are highly polluting and highly toxic. At present, the main method is to treat them by coagulation, flocculation, and scale inhibition after turning them into wastewater. However, due to the extensive use of flocculants, the treatment costs are relatively high.

Method used

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  • A method for resource utilization of silicon tetrachloride pollutants
  • A method for resource utilization of silicon tetrachloride pollutants
  • A method for resource utilization of silicon tetrachloride pollutants

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Embodiment 1

[0029] A method for resource utilization of silicon tetrachloride pollutants is to make silicon tetrachloride pollutants into a polysilicate composite flocculant. The specific preparation scheme is as follows: add 35g metal salt and 0.8 g coupling agent, after mixing evenly, control the temperature at 120°C, react for 15min, then add 8g of modified chitosan material, and continue the heat preservation reaction for 2h; then add 1000g of water to the mixing kettle, add inorganic acid to adjust the pH value to 1, and stir After uniformity, slowly add 80g of silicon tetrachloride pollutants into the mixing kettle within 60 minutes, stir and mix for 20 minutes after the addition is complete, then add to the reaction kettle, stir and mix evenly, control the temperature at 80°C, and react for 5 hours. The polysilicate composite flocculant is obtained.

[0030] Described modified chitosan material is a kind of chitosan material containing oxazoline base, and its preparation method is ...

Embodiment 2

[0039]A method for resource utilization of silicon tetrachloride pollutants is to make silicon tetrachloride pollutants into a polysilicate composite flocculant. The specific preparation scheme is as follows: add 42g metal salt and 1.8 g coupling agent, after mixing evenly, control the temperature at 130°C, react for 20min, then add 9g of modified chitosan material, and continue the heat preservation reaction for 5h; then add 1300g of water into the mixing kettle, add inorganic acid to adjust the pH value to 2, stir After uniformity, slowly add 120g of silicon tetrachloride pollutants into the mixing kettle within 90 minutes, stir and mix for 25 minutes after the addition is complete, then add to the reaction kettle, stir and mix evenly, control the temperature at 95°C, and react for 6 hours. The polysilicate composite flocculant is obtained.

[0040] Described modified chitosan material is a kind of chitosan material containing oxazoline base, and its preparation method is as...

Embodiment 3

[0049] A method for resource utilization of silicon tetrachloride pollutants is to make silicon tetrachloride pollutants into a polysilicate composite flocculant. The specific preparation scheme is as follows: add 52g of metal salt and 3.4 g coupling agent, after mixing evenly, control the temperature at 150°C, react for 30min, then add 13g of modified chitosan material, and continue the heat preservation reaction for 7h; then add 1500g of water into the mixing kettle, add inorganic acid to adjust the pH value to 3, and stir After uniformity, slowly add 150g of silicon tetrachloride pollutants into the mixing kettle within 120min, stir and mix for 30min after the addition is complete, then add to the reaction kettle, stir and mix evenly, control the temperature at 110°C, and react for 8h. The polysilicate composite flocculant is obtained.

[0050] Described modified chitosan material is a kind of chitosan material containing oxazoline base, and its preparation method is as fol...

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Abstract

The present invention relates to the field of environmental protection, and specifically relates to a resource utilization method of a silicon tetrachloride pollutant; the present invention provides a new method for resource utilization of a silicon tetrachloride pollutant for turning waste into treasure; the method The polysilicic acid converted from silicon tetrachloride waste under acidic conditions is then reacted with a metal salt flocculant modified by coupling with an oxazoline-based chitosan material to form a polysilicate composite Flocculants; Polysilicic acid in the polysilicate composite flocculant of the present invention is used as a coagulant aid in the system, which can effectively treat low-temperature pollutants and low-turbidity pollutants, and promote the formation of large particle sediments. It has excellent turbidity removal performance; the method uses pollutants to prepare flocculants, which is an invention that turns waste into wealth and greatly saves resources, and has very practical value and social benefits.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a resource utilization method for silicon tetrachloride pollutants. Background technique [0002] At present, the polysilicon production process is mainly based on the improved Siemens method and the silane method. With this method, 10-15 tons of silicon tetrachloride pollutants will be emitted for every 1 ton of polysilicon produced by this method. Silicon tetrachloride is a colorless and transparent toxic liquid with a pungent odor. The suffocating odor can seriously damage the small airway function, nervous system, blood system, and digestive system of the human body. So direct discharge will cause a lot of pollution. [0003] CN209333491U provides a kind of waste gas inlet device for silicon tetrachloride washing tower, set washing tower and slag pushing rod, the lower left side of washing tower is connected with the silicon tetrachloride waste gas inlet pipe inserted...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C08B37/08C01B33/20
CPCC01B33/20C02F1/52C02F1/5236C02F1/5263C08B37/003
Inventor 蔡兰花王芳李培则
Owner 东阳市前途工业设计有限公司
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