Method for preparing layered sodium disilicate by using waste white slime and alkali waste water
A technology of sodium disilicate and waste alkaline water, applied in the directions of alkali metal silicate, chemical instruments and methods, silicate, etc., can solve the problems of waste of resources, low profit, low purity of finished products, etc., and achieve a simple production process , The effect of reducing production cost and high product purity
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Embodiment 1
[0034] will contain Na 2 O6-10%, SiO 2 1-3% spent lye with SiO 2 15-25% waste silicon slag according to a certain weight ratio Na 2 O: SiO 2 = 1: 1 put into the reaction kettle, heat at 100°C for 5 hours to react, and when the sodium silicate solution with a modulus of 0.95 is obtained, add 0.5% of modified cationic polyacrylamide with a concentration of 0.005%, charcoal powder 0.5% for physical reaction to precipitate and polymerize positive hydroxide impurities. Then add the above feed liquid into the settling tank, the temperature drops to 60°C and use a plate filter press to filter the filter residue back to the zirconium salt production system. The zirconia content in the filter residue is 5%; the filtrate is added with caustic soda and foaming soda to control the solid content to 45 %, when the modulus is 1.9, pour the solution into the spray drying tower and directly heat it with hot air at 150°C to make amorphous powdery sodium disilicate, then add the amorphous so...
Embodiment 2
[0036] will contain Na 2 O6-10%, SiO 2 1-3% spent lye with SiO 2 15-25% waste silicon slag according to a certain weight ratio Na 2 O: SiO 2= 1: 1 put into the reaction kettle, heat it at 110°C for 7 hours to react, and when the sodium silicate solution with a modulus of 1.00 is obtained, add 0.8% of modified cationic polyacrylamide with a concentration of 0.08%, charcoal powder 0.8% carry out physical reaction to precipitate and polymerize positive hydroxide impurities. Then add the above feed liquid into the settling tank, the temperature drops to 70°C and press filter with a plate filter press to get the filter residue back to the zirconium salt production system, the zirconia content in the filter residue is 7%; the filtrate is added with caustic soda and foaming soda to control the solid content to 48 %, when the modulus is 2.0, put the solution into the spray drying tower and directly heat it with hot air at 190°C to make amorphous powdery sodium disilicate, then add...
Embodiment 3
[0038] will contain Na 2 O6-10%, SiO 2 1-3% spent lye with SiO 2 15-25% waste silicon slag according to a certain weight ratio Na 2 O: SiO 2 = 1:1 Put it into the reaction kettle, heat it at 100°C for 8 hours to react, and when the sodium silicate solution with a modulus of 1.01 is obtained, add 0.9% of modified cationic polyacrylamide with a concentration of 0.009%, and 0.9% of charcoal powder % carry out physical reaction to precipitate and polymerize positive hydroxide impurities. Then add the above feed liquid into the settling tank, the temperature drops to 80°C and press filter with a plate filter press to get the filter residue back to the zirconium salt production system, the zirconia content in the filter residue is 8%; the filtrate is added with caustic soda and foaming soda to control the solid content to 50 %, when the modulus is 2.03, put the solution into the spray drying tower and directly heat it with hot air at 230°C to make amorphous powdery sodium disili...
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