Method for preparing silica through coal gangue aluminum extraction waste slag
A technology for coal gangue and white carbon black, which is applied in the field of preparing white carbon black, can solve the problems of difficult industrial production, different aluminum content of aluminum extraction waste residues, and difficult control of reaction conditions, and achieves high product purity and easy control of reaction conditions. Effect
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[0020] Example 1
[0021] Weigh 100g waste residue and mix 90g quartz sand to make SiO 2 The total content is 91.6%, Al 2 O 3 The content is 5%, and then according to SiO 2 :Na 2 O molar ratio=1:0.43, add 132g of sodium carbonate, mix and grind with a ball mill to form a powder mixture of about 100μm. Weigh 100g of the mixed sample into a rotary kiln, set the temperature to 820°C and keep it constant for 3h, and obtain crude sodium silicate solid particles after the reaction. Place the above crude sodium silicate particles in a 1L autoclave, add 250mL of distilled water according to the solid-to-liquid ratio of 1:3, raise the temperature to 200°C, stir and dissolve for 3 hours, then cool to room temperature, filter and separate to obtain colorless and transparent silicic acid Sodium solution and filter residue, calculate the dissolution rate of sodium silicate. Dilute the sodium silicate solution to 10Bé and place it in a 2L four-necked flask. When the water bath is heated to 80...
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[0022] Comparative Example 1
[0023] Weigh 100g of waste residue 1, according to SiO 2 :Na 2 O molar ratio=1:0.43, add 61g of sodium carbonate, mix and grind with a ball mill to form a powder mixture of about 100μm. The remaining steps are the same as in Example 1. The dissolution rate of the crude sodium silicate obtained is 74.45%, and the silica particle size and oil absorption value are 3.21μm and 3.31cm, respectively 3 / g.
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[0024] Example 2
[0025] Weigh 100g waste residue 2, 45g quartz sand and mix to make SiO 2 The total content is 90.4%, Al 2 O 3 The content is 5%, and then according to SiO 2 :Na 2 O molar ratio=1:0.43, add 99.1g of sodium carbonate, mix and grind with a ball mill to form a powder mixture of about 100μm. Weigh 100g of the mixed sample into a rotary kiln, set the temperature to 820°C for 3 hours, and obtain crude sodium silicate solid particles after the reaction. Place the above crude sodium silicate particles in a 1L autoclave, add 250mL of distilled water according to the solid-to-liquid ratio of 1:3, raise the temperature to 200°C, stir and dissolve for 3 hours, then cool to room temperature, filter and separate to obtain colorless and transparent silicic acid Sodium solution and filter residue, calculate the dissolution rate of sodium silicate. Dilute the sodium silicate solution to 10Bé and place it in a 2L four-necked flask. When the water bath is heated to 80℃, start to ...
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