19-08-2021 дата публикации
Номер: US20210253435A1
Принадлежит:
A treatment method for purifying silicon microparticles contained in waste resulting from the cutting of ingots with a diamond wire comprises: a) providing a contaminated slurry, resulting from the waste, formed by an aqueous mixture comprising the silicon microparticles, organic species and metal contaminants; b) adding a dilute hydrogen peroxide solution to the contaminated slurry, in order to form a first mixture, and stirring the first mixture; c) solid/liquid separation of the first mixture in order to obtain, on the one hand, a first purified slurry and, on the other hand, a first liquid loaded with organic species and metal contaminants. 1. A treatment method for purifying silicon microparticles contained in waste resulting from cutting ingots with diamond wires , the method comprising:a) providing a contaminated slurry, resulting from the waste, comprising an aqueous mixture including the silicon microparticles, organic species and metal contaminants;b) adding a dilute hydrogen peroxide solution to the contaminated slurry to form a first mixture comprising the contaminated slurry, hydrogen peroxide and water, and stirring the first mixture; andc) performing solid/liquid separation of the first mixture in order to obtain a first purified slurry and a first liquid loaded with organic species and metal contaminants.2. The treatment method of claim 1 , wherein claim 1 , in step a) claim 1 , the contaminated slurry is obtained from the waste claim 1 , by a solid/liquid separation technique chosen from sedimentation claim 1 , centrifugation claim 1 , cyclonic separation or filtration claim 1 , and the contaminated slurry contains about 50% solid matter and 50% liquid matter claim 1 , in weight percentages.3. The treatment method of claim 2 , wherein claim 2 , in step b) claim 2 , the dilute hydrogen peroxide solution has a mass concentration of between 1% and 35%.4. The treatment method of claim 3 , wherein step b) comprises adding pure water to the first mixture ...
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