A kind of preparation method of silicon dioxide modified barium sulfate powder
A technology of silica and barium sulfate powder, applied in chemical instruments and methods, calcium/strontium/barium sulfate, inorganic chemistry, etc., can solve problems such as complex process, uneven dispersion, organic modification, etc. Simple, simple process, reduce the effect of reunion
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Embodiment 1
[0023] (1) Prepare a barium sulfide solution with a concentration of 15wt%, add it to a 25wt% sodium carbonate solution at a molar ratio of 1:1.5, and react with high-shear stirring at a speed of 8000r / min at 30°C for 4 hours;
[0024] (2) Step (1) After filtering and washing, add the filter cake to the 25wt% sodium sulfate solution with a molar ratio of sodium sulfate to barium sulfide of 1:1.5, and perform a high-shear stirring reaction at a speed of 8000r / min. , The reaction temperature is 30°C, and the reaction time is 8 hours;
[0025] (3) After completing step (2), add sodium silicate with a concentration of 15wt% in step (2), the addition amount is 10% of the molar amount of barium sulfide, and the molar ratio of sodium silicate is 1.2:1 0.8 molL -1 The sulfuric acid solution is stirred and reacted at a speed of 8000r / min for 2 hours, filtered, washed with water, and dried at 200°C to obtain ultrafine silica modified barium sulfate particles. The particle size is 500nm, the...
Embodiment 2
[0027] (1) Prepare a barium sulfide solution with a concentration of 0.1% by weight, add it to a sodium carbonate solution with a concentration of 1% by weight according to a molar ratio of 1:1.2, and react with high shear stirring at a speed of 500r / min at 20°C for 0.5 hours;
[0028] (2) Step (1) After filtering and washing, add the filter cake to the 1wt% sodium sulfate solution at a molar ratio of sodium sulfate to barium sulfide of 1:1.2 to perform a high-shear stirring reaction at a speed of 500r / min , The reaction temperature is 20°C, and the reaction time is 0.5 hours;
[0029] (3) After completing step (2), add 10wt% sodium silicate in step (2), the addition amount is 0.1% of the molar amount of barium sulfide, and the molar ratio of sodium silicate to sodium silicate is 1.1:1. molL -1 After the sulfuric acid solution is continuously stirred and reacted at a speed of 500r / min for 1 hour, filtered, washed with water, and dried at 100°C, ultrafine silica modified barium sulf...
Embodiment 3
[0031] (1) Prepare a barium sulfide solution with a concentration of 10% by weight, add it to a sodium carbonate solution with a concentration of 15% by weight according to a molar ratio of 1:1.3, and react with high shear stirring at a speed of 3000r / min at 65°C for 2 hours;
[0032] (2) Step (1) After filtering and washing, add the filter cake to a 15wt% sodium sulfate solution with a molar ratio of sodium sulfate to barium sulfide of 1:1.3, and perform a high-shear stirring reaction at a speed of 3000r / min. , The reaction temperature is 65°C, and the reaction time is 2 hours;
[0033] (3) After completing step (2), add sodium silicate with a concentration of 12wt% in step (2), the addition amount is 5% of the molar amount of barium sulfide, and the molar ratio of sodium silicate is 1.1:1 0.4molL -1 The sulfuric acid solution is continuously stirred and reacted at a speed of 3000r / min for 1.5 hours, filtered, washed with water, and dried at 150°C to obtain ultrafine silica modifi...
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