Waste silicon wafer treatment method for hydrolysis hydrogen production

A treatment method, a technology of hydrogen production by hydrolysis, applied in the field of hydrogen production, can solve the problems of strong alkali corrosion, high requirements on equipment materials, unsustainable reaction of silicon, and low chemical activity of silicon, so as to improve chemical reaction activity and hydrogen production The effect of large amount and high chemical activity

Active Publication Date: 2021-03-02
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the corrosiveness of strong alkali has higher requirements on equipment materials, and also brings certain harm to users.
However, the low chemical activity of silicon and the hindering effect of the insoluble product silica make silicon unable to continuously react in neutral aqueous solution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] A method for treating waste silicon wafers for hydrogen production by hydrolysis, comprising:

[0019] 1) Cutting waste silicon wafers, cleaning with deionized water, and drying;

[0020] 2) Weigh a certain amount of reduced metal powder, low melting point metal salt, binder and organic solvent, stir and mix, and prepare a slurry; and apply the slurry on both sides of the waste silicon chip in step 1) according to a certain ratio;

[0021] 3) Laminate the metal sheet with the silicon sheet in step 2), each silicon sheet is sandwiched between two metal sheets, and the metal sheet fully covers the silicon sheet, the ratio of the area of ​​the metal sheet to the silicon sheet is 1.1; the number of silicon sheets is 1 piece, the number of metal pieces is 2 pieces;

[0022] 4) pressing the product of step 3) into blocks;

[0023] 5) 4) heat-treat the product of step 4) in an inert gas for 5 hours; the heat treatment temperature is 600°C; then cool naturally to normal tempe...

example 2

[0029] A method for treating waste silicon wafers for hydrogen production by hydrolysis, comprising:

[0030] 6) cutting waste silicon wafers, cleaning with deionized water, and drying;

[0031] 7) Weigh a certain amount of reduced metal powder, low melting point metal salt, binder and organic solvent, stir and mix, and prepare a slurry; and apply the slurry on both sides of the waste silicon chip in step 1) according to a certain ratio;

[0032] 8) Laminate the metal sheet with the silicon sheet in step 2), each silicon sheet is sandwiched between two metal sheets, and the metal sheet fully covers the silicon sheet, the ratio of the area of ​​the metal sheet to the silicon sheet is 1.05; the number of silicon sheets is 2 pieces, the number of metal pieces is 3 pieces;

[0033] 9) pressing the product of step 3) into blocks;

[0034] 10) 4) heat-treat the product of step 4) in an inert gas for 10 h; the heat treatment temperature is 500°C; then cool naturally to normal tempe...

example 3

[0040] Implementation steps such as example 1

[0041] Composition design of waste silicon wafers, including:

[0042] 5) 2 silicon chips, 97.4g; zinc powder, 40g; tin bromide, 3g, bismuth chloride, 6g; binder, 4g; 3 metal sheets, 150g (including lithium, 20g; aluminum sheet 135g); The organic solvent is butanone;

[0043] 6) 2 silicon wafers, 98.0g; magnesium powder, 20g; bismuth chloride, 4g, bismuth bromide, 8g; binder, 3g; 3 metal sheets, 150g (including lithium, 8g; magnesium strip 92g); The organic solvent is pentanone

[0044] 7) 2 silicon chips, 97.98g; magnesium powder, 20g; bismuth chloride, 4g, stannous bromide, 8g; binder, 3g; 3 metal sheets, 148g (including lithium, 20g; zinc sheet 128g) ; The organic solvent is acetone

[0045] Hydrolysis experiments show that the silicon-based hydrogen production material has good hydrolysis performance in 50° hot water.

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PUM

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Abstract

The invention discloses a waste silicon wafer treatment method for hydrolysis hydrogen production. Waste silicon wafers are used as raw materials, and a silicon-based hydrogen production material is obtained through cleaning, slurry smearing, drying, lamination with metal sheets, tabletting and heat treatment, wherein slurry is a mixture of reducing metal powder, a low-melting-point metal salt, abinder and an organic solvent; the reducing metal powder is one or more of magnesium, aluminum and zinc; the low-melting-point metal salt is one or more of tin halide salts and bismuth halide salts; the tin halide salt is one or more of stannous chloride, stannic chloride, stannic bromide, stannous bromide and stannous fluoride; the bismuth halide salt is one or more of bismuth chloride, bismuth bromide and bismuth iodide; the organic solvent is one or more of acetone, butanone, pentanone, hexanone, cyclopentanone and cyclohexanone; and the metal sheets are two or more of lithium sheets, magnesium sheets, aluminum sheets and zinc sheets, and must contain lithium sheets. The silicon-based hydrogen production material has good hydrolytic property and has good application prospect in the field of hydrogen production.

Description

technical field [0001] The patent of the invention belongs to the field of hydrogen production, and specifically relates to a method for treating waste silicon wafers for hydrogen production by hydrolysis. Background technique [0002] In the past 20 years, with the rapid development of solar cells, solar cells dominated by silicon wafers have ushered in the end of life, and more and more waste silicon wafers have piled up like mountains, bringing pollution to the environment. The recycling and reuse of waste silicon wafers has become a key issue that governments and researchers in various countries need to solve urgently. The common methods of recycling waste silicon wafers are: 1) silicon wafers remove surface defects and can be reused as silicon wafer sources for solar cells; 2) silicon wafers are oxidized into silicon dioxide, which is used as raw materials for silicon, and then reproduced; 3 ) Silicon wafers are used for other purposes, such as hydrogen production mate...

Claims

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Application Information

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IPC IPC(8): C01B3/06C01B3/08
CPCC01B3/06C01B3/08Y02E60/36
Inventor 暴云佳曹江行张佳颖赵乐范美强
Owner CHINA JILIANG UNIV
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