Production technology of vapor-phase silicon dioxide
A fumed silica, production process technology, applied in the direction of silica, silicon oxide, nanotechnology, etc., can solve the problems of explosion, hydrogen chloride by-products, unfriendly environment, etc., to reduce production cost, high purity, high performance excellent effect
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Embodiment 1
[0055] A production process of fumed silica, comprising the following steps:
[0056] S1. 50 kg of organic silicon slurry and 50 kg of hydrolyzed siloxane mixture are pretreated in total to 100 kg, and then sent to the rotary kiln 7 for heating and burning at 1200 ° C for 6 hours;
[0057] In step S1, the pretreatment process is:
[0058] ①Send the organic silicon slurry and siloxane mixture into the immersion tank 1, add hydrochloric acid aqueous solution with a volume concentration of 2% in the material circulation tank 5, and add 0.05% hydrogen peroxide according to the total mass of the total mixture, and pass through the circulation pump 6 48-hour uninterrupted cycle soaking;
[0059] ②The circulating liquid passes through the grid plate 2 and the permeable membrane 3 in the immersion tank, and the solid hydrolyzate such as pulp residue cannot pass through, and the circulating liquid is discharged after circulating soaking;
[0060] ③Continue to add water into the mater...
Embodiment 2
[0072] A production process of fumed silica, comprising the following steps:
[0073] S1. Pretreating the organic silicon slurry and the hydrolyzed siloxane mixture, and then sending it to the rotary kiln 7 for heating and burning at 1500°C for 8 hours;
[0074] In step S1, the pretreatment process is:
[0075] ①Send the organic silicon slurry and siloxane mixture into the immersion tank 1, add a hydrochloric acid aqueous solution with a volume concentration of 3% in the material circulation tank 5, and add 0.1% hydrogen peroxide according to the total mass of the total mixture, and pass through the circulation pump 6 72-hour uninterrupted cycle soaking;
[0076] ②The circulating liquid passes through the grid plate 2 and the permeable membrane 3 in the immersion tank, and the solid hydrolyzate such as pulp residue cannot pass through, and the circulating liquid is discharged after circulating soaking;
[0077] ③Continue to add water into the material-separated circulation p...
Embodiment 3
[0089] A production process of fumed silica, comprising the following steps:
[0090] S1. Pretreating the organic silicon slurry and the hydrolyzed siloxane mixture, and then sending it to the rotary kiln 7 for heating and burning at 1800°C for 10 hours;
[0091] In step S1, the pretreatment process is:
[0092] ①Send the organic silicon slurry and siloxane mixture into the immersion tank 1, add a hydrochloric acid aqueous solution with a volume concentration of 5% in the material circulation tank 5, and add 0.2% hydrogen peroxide according to the total mass of the total mixture, and pass through the circulation pump 6 96 hours of uninterrupted cycle soaking;
[0093] ②The circulating liquid passes through the grid plate 2 and the permeable membrane 3 in the immersion tank, and the solid hydrolyzate such as pulp residue cannot pass through, and the circulating liquid is discharged after circulating soaking;
[0094] ③Continue to add water into the material-separated circulat...
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