Synthesis of wollastonite from natural materials without fusion

Details Synthesis of wollastonite from natural materials without fusion Synthesis of wollastonite from natural materials without fusion

1974-06-20

1976-06-29

Satterfield, Walter R.

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

106 63, 106 735, 106 69, 423326, C01B 3324

Patent

active

039668843

ABSTRACT:
The present invention relates to a process for the synthesis of crystallized wollastonite from a natural material having a high content of calcium carbonate and silica.
According to the invention, silica or calcium carbonate are added to the natural material so that the mixture has a silica/carbonate content which varies less than 10% from the value of the stoichiometric ratio, the silica being introduced preferably in the form of crystallized silica having a large surface area, for example, kieselguhr. Crystallized CaSiO.sub.3 is obtained between 1000.degree.C and 1100.degree.C and high-temperature wollastonite, preferably between 1100.degree. and 1200.degree.C, according to the reaction: ##EQU1## The present invention may be used to produce wollastonite intended in particular for use in road surfaces and for the charging materials required in the rubber and plastics industry.

REFERENCES:
patent: 2621131 (1952-12-01), Lathe
patent: 3379523 (1968-04-01), Chaklader
patent: 3381064 (1968-04-01), Yamaguchi et al.
patent: 3501324 (1970-03-01), Kubo
patent: 3520705 (1970-07-01), Shido et al.
patent: 3782981 (1974-01-01), Rostoker
Hurlbut, C; Dana's Manual of Minerology; New York, 1941, p. 326.

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