Synthetic wollastonite and a process for its manufacture

Details Synthetic wollastonite and a process for its manufacture Synthetic wollastonite and a process for its manufacture

1975-01-21

1976-07-06

Stern, Edward

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

423331, 106 735, C01B 3324, C09C 128

Patent

active

039679748

ABSTRACT:
Substantially pure, synthetic crystalline .beta.-wollastonite having a specific BET surface of 1-30 m.sup.2 /g made by first producing calcium silicate hydrates having a molar ratio of SiO.sub.2 :CaO = about 0.7 to about 1.3 by hydrothermal treatment of an aqueous mixture of a source of CaO and SiO.sub.2 and then annealing the calcium silicate hydrates at about 800.degree.C to about 1150.degree.C to convert them to the .beta.-wollastonite. The invention also encompasses the use of the calcium silicate hydrates and the .beta.-wollastonite in the manufacture of ceramic materials and glazings.

REFERENCES:
patent: 3264130 (1966-08-01), Mays
patent: 3316116 (1967-04-01), Podschus
patent: 3552915 (1971-01-01), Rostoker
patent: 3861935 (1975-01-01), Ohnemuller et al.

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