Process for the preparation of sodium silicates

Details Process for the preparation of sodium silicates Process for the preparation of sodium silicates

C - Chemistry, Metallurgy

01

B

C01B 33/32 (2006.01) C01B 33/38 (2006.01)

Patent

CA 2061634

HOE 91/H 003 Process for the preparation of sodium silicates Abstract: To prepare crystalline sodium silicates having a laminat- ed structure, a molar ratio of SiO2 to Na2O of (1.9 to 2.1) : 1 and a water content of less than 0.3 % by weight from a water glass solution which has a solids content of at least 20 % by weight and is obtained by reaction of sand with sodium hydroxide solution in a molar ratio of SiO2 : Na2O of (2.0 to 2.3) : 1, the water glass solution is treated with hot air of 200 to 300°C in a spray drying zone to form a pulverulent, amorphous sodium silicate having a water content (determined as the loss on ignition at 700°C) of 15 to 23 % by weight. The pulverulent, amorphous, water-containing sodium silicate is first ground, preferably to particle sizes of 1 to 50 µm, before it is introduced into an inclined rotary tubular oven and treated in this in countercurrent with flue gas at temperatures of more than 500 to 850°C to form crystalline sodium silicate. The sodium silicate issuing from the rotary tubular oven is first comminuted to particle sizes of 0.1 to 12 mm and finally ground to particle sizes of 2 to 400 µm.

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