Manufacture of precipitated calcium carbonate

Details Manufacture of precipitated calcium carbonate Manufacture of precipitated calcium carbonate

C - Chemistry, Metallurgy

01

F

C01F 11/18 (2006.01) C04B 2/06 (2006.01)

Patent

CA 2203210

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 RNH2 and alkanolamines of the formula NH2(R1OH), where R and R1 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.

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