Spherical silicon dioxide powder as well as preparation method and application thereof
A technology of spherical silica and preparation process, which is applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of not being able to provide high specific surface area, and achieve regular microscopic appearance, appropriate particle size, and particle size The effect of a narrow distribution
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Embodiment 1
[0072] Step 1: Measure 20mL of 2mol / L concentrated water glass, add 380mL deionized water to dilute to 0.1mol / L water glass solution. At a temperature of 45°C and a stirring rate of 200rpm, add 1 mol / L dilute sulfuric acid dropwise at a flow rate of 65mL / h until the pH drops to 6.5, stop stirring, and leave to age in a water bath at 45°C for 40min.
[0073] Step 2: Stir the silica gel obtained in Step 1 at a speed of 5000 rpm in a turbulent flow reactor to break up. Add 150ml of 0.1mol / L water glass solution and 1mol / L dilute sulfuric acid at flow rates of 250mL / h and 150ml / h, respectively, to make the pH of the system 9. Continue to add dilute sulfuric acid solution dropwise to lower the pH of the solution to 4, stop heating, and continue stirring for 15 minutes.
[0074] Step 3: Suction filtration and washing of the mixture obtained in step 2. Then disperse into 50% ethanol aqueous solution, and continue to disperse at 1000 rpm for 30 min. The suspension was spray-dried, ...
Embodiment 2
[0076] Method is with embodiment 1, and difference is:
[0077] In step 1: the modulus of water glass is 1, and the bottom liquid concentration that is diluted into is 0.3mol / L. The temperature is 30° C., the stirring rate is 400 rpm, and the dropping rate of dilute sulfuric acid is 50 mL / h. The standing aging temperature is 30° C., and the standing aging time is 30 minutes.
[0078] In step 2: the rotational speed in the turbulent flow reactor is 8000rpm. When the pH value dropped from 9 to 4.5, stop heating and continue stirring for 20 minutes.
[0079] In step 3: the rotational speed during dispersion is 1300 rpm, and the dispersion time is 30 minutes. During spray drying, the feed flow rate is 30mL / min, the inlet temperature is 170°C, and the outlet temperature is 60°C.
Embodiment 3
[0081] Method is with embodiment 1, and difference is:
[0082] In step 1: the modulus of water glass solution is 3, and the concentration of water glass solution is 0.5mol / L. The reaction temperature was 60° C., the stirring rate was 600 rpm, and the dilute sulfuric acid dropping rate was 60 mL / h.
[0083] The standing aging temperature is 60° C., and the aging time is 30 minutes.
[0084] In step 2: the rotational speed of the turbulent flow reactor is 10000 rpm, and when the pH value drops from 9 to 5, stop heating and continue stirring for 30 min.
[0085] In step 3: the dispersant is pure ethanol, the rotational speed during dispersion is 1500 rpm, the dispersion time is 30 min, the feed flow rate of the spray drying is 20 mL / min, the inlet temperature is 180° C., and the outlet temperature is 70° C.
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Abstract
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