Alkaline earth metal carbonates

Details Alkaline earth metal carbonates Alkaline earth metal carbonates

1984-05-14

1990-02-13

Straub, Gary P.

Chemistry of inorganic compounds

Carbon or compound thereof

Oxygen containing

423165, 423432, 106463, 106464, 8110, C01F 521, C01F 1118

Patent

active

049005332

ABSTRACT:
A precipitated alkaline earth metal carbonate is produced by calcining raw alkaline earth metal carbonate, for example a calcium carbonate, under conditions such that substantially all the chemically combined carbon dioxide is driven off to form an oxide, slaking the oxide in water to form a suspension of the corresponding alkaline earth metal hydroxide, allowing the suspension to cool to 45.degree. C. or below, and then carbonating the hydroxide in suspension in water with substantially pure carbon dioxide in the presence of a dithionite bleaching reagent to form a precipitate of an alkaline earth metal carbonate of increased brightness and purity. The precipitate may then be separated from the aqueous medium by, for example, filtration.

REFERENCES:
patent: Re23794 (1954-03-01), Schur
patent: 1994271 (1935-03-01), Church
patent: 2520850 (1950-08-01), Minnick
patent: 2631922 (1953-03-01), Schur
patent: 4239736 (1980-12-01), Fenske
Lewis, C. J., Some Practical Suggestions on Waste Acid Treatment, Rock Products, vol. 52, #6, Jun. 1945, pp. 117-119, 149.

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