Continuous production device of amorphous silica gel and production method
A production device and amorphous technology, applied in chemical instruments and methods, silicon oxide, silicon dioxide, etc., can solve the problems of long production cycle, high energy consumption, unstable product quality, etc., to eliminate quality differences and improve production. The effect of efficiency
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[0022] Example 1
[0023] First, adjust the screw extruder according to the process requirements for preparing amorphous silica gel; adjust the temperature of the mixing reaction section to 30℃, the jacket temperature of the aging section to 90℃, the temperature of the washing section to 60℃, and then the 8% Soakine and 18% sulfuric acid are placed in a storage tank, preheated to 30℃, and then continuously added to the screw extruder at a mass ratio of 1:0.75, and the screw speed is controlled to 1R / min, so that the material remains in the mixing reaction section for 2h. The aging section is kept for 4 hours, and then 60℃ water is added to the screw extruder to rinse the material after the material advances to the washing section. When the sodium ion at the rinsing water outlet is less than 50ppm, the water washing is stopped, and the screw extruder product extrusion end The extruded product is sent to a drying room at 400°C for drying, crushed and sieved to obtain a silica gel p...
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[0024] Example 2
[0025] According to the process conditions of Example 1, the screw speed was adjusted to 4.5R / min, so that the material was kept in the mixing reaction section for 1h, and the aging section was kept for 1h. When the sodium ion concentration at the rinse water outlet of the washing section was less than 50ppm, the washing was stopped. Change, the final pore structure of silica gel product: specific surface area: 150m 2 / g; pore volume: 0.35ml / g; pore size: 5.2nm.
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[0026] Example 3
[0027] Set the jacket temperature of the mixing reaction section and the aging section to 90℃, and adjust the temperature of the water washing section to 80℃, and then add 10% sodium sulfate and 22% sulfuric acid to the screw extruder in a mass ratio of 1:1.5 , Control the screw speed to 0.7R / min, keep the material mixing reaction section for 3h and the aging section for 6h, and then add 80℃ water to the screw extruder to rinse the material after the material advances to the washing section. When the sodium ion concentration is less than 50ppm, the product will be sent to a 600℃ drying room for drying. The pore structure of the silica gel product measured by crushing and screening is: specific surface area: 220m 2 / g; pore volume: 1.47ml / g; pore size: 29.8nm.
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