Process for producing ultrafine particles of colloidal calcium c

Details Process for producing ultrafine particles of colloidal calcium c Process for producing ultrafine particles of colloidal calcium c

1997-01-31

1998-05-12

Langel, Wayne

Chemistry of inorganic compounds

Carbon or compound thereof

Oxygen containing

423431, C01F 1118

Patent

active

057500860

ABSTRACT:
A process for producing ultrafine particles of colloidal calcium carbonate which comprises the steps of adding magnesium sulfate into an aqueous suspension of calcium hydroxide, carbonating the aqueous suspension by introducing carbon dioxide into the aqueous suspension, and adding zinc sulfate alone or together with sulfuric acid into the aqueous suspension simultaneously with the carbonation step. Ultrafine particles of colloidal calcium carbonate in a chain-structured configuration which have an average diameter of 0.01 .mu.m or smaller, an average length of 0.05 .mu.m or longer, and a BET surface area of 70 m.sup.2 /g or greater are produced.

REFERENCES:
patent: 4157379 (1979-06-01), Arika et al.

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