Method for purification of calcium carbonate

Details Method for purification of calcium carbonate Method for purification of calcium carbonate

1994-11-21

1997-11-25

Langel, Wayne

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423430, C01F 1118

Patent

active

056908970

ABSTRACT:
A method for lowering the iron content of calcium carbonate is disclosed. The method involves addition of an iron chelating agent to an aqueous calcium carbonate slurry, reducing the pH of the aqueous calcium carbonate by employing carbon dioxide containing gas, while maintaining the aqueous calcium carbonate slurry at an elevated temperature. The slurry is stirred, filtered, washed and dried. The calcium carbonate product resulting from the process of the present invention has a reduced iron content.
Calcium carbonate produced according to the method of this invention is particularly suitable for use as food or pharmaceutical additives and may also be useful as a filler in papermaking processes or as additives in plastic products.

REFERENCES:
patent: 4157379 (1979-06-01), Arika et al.
patent: 4239736 (1980-12-01), Fenske
patent: 4272498 (1981-06-01), Faatz
patent: 4793985 (1988-12-01), Price et al.
patent: 4824653 (1989-04-01), Severinghaus, Jr. et al.

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