Method for recycling silicon cutting waste mortar
A waste mortar, silicon cutting technology, applied in chemical instruments and methods, silicon carbide, silicon compounds, etc., to achieve the effects of improving appearance quality, improving conversion rate, and high dispersibility
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Embodiment 1
[0052] Step (1): Weigh 2000g of silicon cutting waste mortar, stir evenly, add to a cyclone separator, and separate to obtain 1350g of solid flow and 650g of liquid flow;
[0053] Step (2): wash the separated solid flow with 1000g of water, vacuum filter, dry the obtained solid phase filter cake at a temperature of 110°C and weigh 1200g (silicon carbide content 94%; silicon component ( Si+SiO2) content 5.3%, wherein silicon content 5%, silicon dioxide content 0.3%);
[0054] Step (3): Dissolving 1200 g of the filter cake in 2400 g of deionized water, stirring evenly and fully to obtain a mixed suspension, stirring and activating the reaction at a temperature of 30°C for 40 minutes to remove the inert film on the surface of the silicon powder;
[0055] Step (4): After the activation reaction, add water glass at a temperature of 30°C (water glass is a solution of sodium silicate, the experiment specifically uses sodium silicate nonahydrate, and the density is 0.85g / cm 3 , the s...
Embodiment 2
[0067] Step (1): Weigh 2000g of silicon cutting waste mortar, stir evenly, add into a cyclone separator, and separate to obtain 1355g of solid flow and 645g of liquid flow;
[0068] Step (2): wash the separated solid flow with 2000g of water, vacuum filter, dry the obtained solid-phase filter cake at a temperature of 110°C and weigh 1200g (silicon carbide content 93.9%; silicon component ( Si+SiO 2 ) content of 5.2%, of which silicon content is 4.9%, silicon dioxide content is 0.3%);
[0069] Step (3): Dissolving 1200 g of the filter cake in 600 g of deionized water, stirring evenly and thoroughly to obtain a mixed suspension, stirring and activating the reaction at 30° C. for 30 minutes to remove the inert film on the surface of the silicon powder;
[0070] Step (4): After the activation reaction, add water glass at a temperature of 30°C, the quality of the water glass is 48g, i.e. 4% of the filter cake quality, stir evenly and let stand for 20 minutes;
[0071] Step (5): T...
Embodiment 3
[0082] Step (1): Weigh 4000g of silicon cutting waste mortar, stir evenly, add to a cyclone separator, and separate to obtain 2700g of solid flow and 1300g of liquid flow;
[0083] Step (2): wash the separated solid flow with 4000g of water, vacuum filter, and dry the obtained solid phase filter cake at a temperature of 110°C to obtain a mass of 2400g (silicon carbide content 94.3%; silicon component ( Si+SiO 2 ) content of 5.3%, including 5% silicon content and 0.3% silicon dioxide content);
[0084] Step (3): Dissolving 2400 g of the filter cake in 1200 g of deionized water, stirring evenly and thoroughly to obtain a mixed suspension, stirring and activating at a temperature of 50°C for 35 minutes to remove the inert film on the surface of the silicon powder;
[0085] Step (4): After the activation reaction, add water glass at a temperature of 50°C, the quality of the water glass is 48g, i.e. 2% of the filter cake quality, stir evenly and let stand for 60 minutes;
[0086]...
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