Manufacture of precipitated calcium carbonate

Details Manufacture of precipitated calcium carbonate Manufacture of precipitated calcium carbonate

1998-04-17

1999-08-17

Langel, Wayne

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423431, 423432, C01F 1118

Patent

active

059390360

ABSTRACT:
A method for the manufacture of precipitated calcium carbonate from impure calcium oxide of improved colour is disclosed. The method comprises admixing impure calcium oxide with an aqueous solution consisting essentially of a salt of at least one compound selected from the group consisting of organic amines of the formula RNH.sub.2 and alkanolamines of the formula NH.sub.2 (R.sup.1 OH), where R and R.sup.1 are alkyl groups of 1-4 carbon atoms, and hydrochloric or nitric acid. The solution obtained is separated from insoluble matter and then treated with carbon dioxide or the carbonate of the amine or alkanolamine. Preferably, the amine of the salt and of the carbonate are the same, and the salt is used in at least the stoichiometric amount to dissolve the lime.

REFERENCES:
patent: 3347624 (1967-10-01), Taylor
patent: 5232678 (1993-08-01), Bleakley et al.
patent: 5558850 (1996-09-01), Bleakley et al.

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