Method for recycling silicon carbide and co-producing white carbon black from waste mortar for wire cutting
A waste mortar and silicon carbide technology, which is applied in the direction of silicon oxide and silicon dioxide, can solve the problems of high equipment investment, difficulty in industrialization, loss of silicon powder, etc., achieve obvious economic and social benefits, reduce efflux, and reduce recycling cost effect
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[0027] Example 1
[0028] Wire cutting is used to manufacture silicon wafers for solar cells and integrated circuits (semiconductors and liquid crystal displays, etc.). The cutting fluid (such as polyethylene glycol, etc.) in the abrasive mortar used is oily, and the composition of the waste mortar is 42% dispersant (Weight), silicon carbide abrasive 48% by weight, silicon powder 8.4% by weight, metal 1.6% by weight. Take 50 kg of waste mortar, first centrifuge the waste mortar, put 29 kg of the obtained sediment into a container, soak it with chloroform (carbon trichloride) or carbon tetrachloride, then wash it with ethanol and water, and then Separated by filtration, 28.3 kg of sand powder was obtained and put into the container. Add 2.8 kg of mixed acid (mass ratio of sulfuric acid to acetic acid: 55% by mass) in the solvent, react at room temperature for 2 hours, filter to obtain solid powder, add 20 kg of water and 0.6 kg of ethylenediaminetetraacetic acid (EDTA) , React f...
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[0029] Example 2
[0030] Wire cutting is used to manufacture silicon wafers for solar cells and integrated circuits (semiconductors and liquid crystal displays, etc.). The cutting fluid (such as polyethylene glycol, etc.) in the abrasive mortar used is oily, and the composition of the waste mortar is 38% dispersant (Weight), silicon carbide abrasive 47% (weight), silicon powder 12.9% (weight), metal 2.1% (weight). Take 50 kg of waste mortar, first centrifuge the waste mortar, put 33.4 kg of the obtained sediment into a container, soak it with chloroform (carbon trichloride) or carbon tetrachloride, then wash with isopropanol and water, and then After filtering and separating, 32.1 kg of sand powder was obtained and put into the container. Add 2,000 mixed acids (mass ratio of hydrochloric acid to nitric acid: 1:1 mass concentration 60%) in the solvent, react at room temperature for 3 hours, filter to obtain solid powder, add 20 kg of water and 0.4 kg of ethylenediamine (en), and...
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