Process of producing needle-shaped calcium carbonate particles

Details Process of producing needle-shaped calcium carbonate particles Process of producing needle-shaped calcium carbonate particles

1988-03-17

1989-04-25

Straub, Gary P.

Chemistry of inorganic compounds

Carbon or compound thereof

Oxygen containing

423165, 106464, C09C 102, C01B 524, C01B 118

Patent

active

048246549

ABSTRACT:
Disclosed is a novel process of producing needle-shaped calcium carbonate particles. In the process of the present invention, aqueous calcium hydroxide solution is added to an aqueous medium bath with a temperature of not less than 60.degree. C. into which carbon dioxide gas or a carbon dioxide-containing gas is being blown to generate needle-shaped calcium carbonate particles. The temperature of the aqueous medium bath is kept not less than 60.degree. C. during the addition of the aqueous calcium hydroxide solution. Then the generated needle-shaped calcium carbonate particles are recovered.

REFERENCES:
patent: 2467082 (1949-04-01), Fleck
patent: 3320026 (1967-05-01), Waldeck
patent: 3340003 (1967-09-01), Judd
patent: 3627480 (1971-12-01), Birchall
patent: 3669620 (1972-06-01), Bennett et al.

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