Process for preparing pure silicon dioxide having high mechanica

Details Process for preparing pure silicon dioxide having high mechanica Process for preparing pure silicon dioxide having high mechanica

1983-05-11

1984-09-25

Cooper, Jack

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

502232, C01B 3312

Patent

active

044735391

ABSTRACT:
Process for preparing high mechanical strength pure silicon dioxide suitable for demanding high-grade technical applications including the combination of steps of (a) forming a reaction mixture containing a silicon dioxide precipitate by controllably and gradually admixing with firm agitation an at most 15 weight percent aqueous solution of hexafluorosilicic acid with an about 15 to about 35 weight percent ammonium hydroxide solution at about 25.degree. C. to about 45.degree. C. until the pH is about 8.5 to about 9.2 in the thus formed mixture containing a silicon dioxide precipitate; (b) separating the silicon dioxide precipitate from the mixture; (c) washing the thus separated precipitate; and (d) calcining the thus washed precipitate at about 900.degree. C. to about 1500.degree. C. Silicon dioxide produced in accordance with the present process has better physical properties than commercially available porous alpha-alumina.

REFERENCES:
patent: 3494875 (1970-02-01), Le Page et al.
patent: 3794713 (1974-02-01), Aboutboul et al.
patent: 3935299 (1976-01-01), Kiselev et al.
patent: 4026997 (1977-05-01), Schneider et al.
patent: 4256682 (1981-03-01), Denton

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