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Harmless treatment and comprehensive utilization method of silicon tetrachloride

A harmless treatment, silicon tetrachloride technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve separation difficulties, easy market saturation, and difficulty in meeting environmental protection discharge standards And other issues

Active Publication Date: 2012-04-18
柯玉章
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although both salts can be used, they are both traditional products, the market is easily saturated, and separation is difficult and expensive
Therefore, under the consideration of the precursor of cost control, enterprises often use alkali for neutralization and discharge, which is the reason why it is difficult to meet environmental protection discharge standards, especially the excessive discharge of sodium chloride will cause permanent pollution to environmental water bodies
If calcium hydroxide is used for neutralization reaction, calcium chloride can be generated with hydrochloric acid, but it does not react with silicic acid, and the emission still does not meet the standard

Method used

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  • Harmless treatment and comprehensive utilization method of silicon tetrachloride
  • Harmless treatment and comprehensive utilization method of silicon tetrachloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for harmless treatment and comprehensive utilization of silicon tetrachloride, the specific process steps are as follows:

[0029] A. On the bottom and inner wall of the liquid storage tank generated by the hydrolysis reaction of silicon tetrachloride, paste nano-titanium dioxide immobilized catalyst tiles, the area is calculated as 3 square meters per cubic meter of liquid, and catalyze for 1 hour.

[0030] B. Add calcium hydroxide to the liquid after catalysis, and control the pH value at 8, that is, the reaction will generate calcium chloride and calcium silicate precipitation;

[0031] C. After the calcium chloride and calcium silicate precipitates generated in step B are separated by sedimentation, the calcium silicate precipitates are washed and dried to obtain hydrated calcium silicate, and the separated liquid is recovered and returned to the silicon tetrachloride hydrolysis process for reuse.

[0032] The preparation method of the nano-titanium dioxide...

Embodiment 2

[0035] A method for harmless treatment and comprehensive utilization of silicon tetrachloride, the specific process steps are as follows:

[0036] A. On the bottom and inner wall of the liquid storage tank generated by the hydrolysis reaction of silicon tetrachloride, paste nano-titanium dioxide immobilized catalyst tiles, the area is calculated as 5 square meters per cubic meter of liquid, and catalyze for 2 hours.

[0037] B. Add calcium hydroxide to the liquid after catalysis, and control the pH value at 9, that is, the reaction will generate calcium chloride and calcium silicate precipitation;

[0038] C. After the calcium chloride and calcium silicate precipitates generated in step B are separated by sedimentation, the calcium silicate precipitates are washed and dried to produce hydrated calcium silicate, and the separated liquid is recovered and returned to the silicon tetrachloride hydrolysis process for reuse.

[0039] The ceramic tiles are nano-titanium dioxide immob...

Embodiment 3

[0043] A method for harmless treatment and comprehensive utilization of silicon tetrachloride, the specific process steps are as follows:

[0044] A. On the bottom and inner wall of the liquid storage tank generated by the hydrolysis reaction of silicon tetrachloride, paste nano-titanium dioxide immobilized catalyst tiles, the area is calculated as 4 square meters per cubic meter of liquid, and catalyze for 3 hours.

[0045] B. Add calcium hydroxide to the liquid after catalysis, and the pH value is controlled at 10, that is, the reaction generates calcium chloride and calcium silicate precipitation;

[0046] C. After the calcium chloride and calcium silicate precipitates generated in step B are separated by sedimentation, the calcium silicate precipitates are washed and dried to produce hydrated calcium silicate, and the separated liquid is recovered and returned to the silicon tetrachloride hydrolysis process for reuse.

[0047] The ceramic tiles are nano-titanium dioxide immo...

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Abstract

The invention relates to a harmless treatment and comprehensive utilization method of silicon tetrachloride, belonging to the fields of energy saving and emission reduction as well as environmental protection. The method provided by the invention comprises the following steps of: carrying out catalytic hydrolysis on the liquid generated by the reaction of silicon tetrachloride by using a nano-titanium dioxide immobilized catalyst; adding calcium hydroxide for reacting to generate calcium chloride and calcium silicate deposits; washing and baking the calcium silicate deposits to prepare hydrated calcium silicate; evaporating the condensed water of calcium chloride and settling and separating the liquid of calcium silicate; and recovering and returning the condensed water and the liquid to the silicon tetrachloride hydrolysis process for recycling. In the invention, water in the production process is pollution-free and can be recycled, thereby saving energy and reducing emission, realizing comprehensive utilization and realizing harmless treatment of silicon tetrachloride; and meanwhile, the method for generating calcium silicate deposits can realize industrialized production of hydrated calcium silicate, thereby filling up the blank of production of hydrated calcium silicate in China.

Description

technical field [0001] The invention relates to a harmless treatment and comprehensive utilization method of by-product silicon tetrachloride, belonging to the fields of energy saving, emission reduction and environmental protection. Background technique [0002] Silicon tetrachloride is a colorless or light yellow fuming liquid with a pungent odor. When meeting with water, it will release heat and emit toxic and corrosive hydrogen chloride fumes. It has a strong stimulating effect on the eyes and upper respiratory tract, and high concentration can cause corneal opacity, respiratory inflammation, and even pulmonary edema. Can cause tissue necrosis after skin contact. [0003] At present, silicon tetrachloride is mainly derived from the production of polysilicon, and it is the largest by-product. The recovered silicon tetrachloride is a poisonous and harmful liquid with strong corrosiveness. If it is not handled properly, it will cause great harm to safety and the environme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58
Inventor 柯玉章
Owner 柯玉章
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