Precipitated calcium carbonate
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United States of America Patent
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Sep 24, 1996
Issued Date -
N/A
app pub date -
Aug 9, 1994
filing date -
Jul 27, 1990
priority date (Note) -
Expired
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Abstract
The calcium carbonate is prepared by: (a) slaking quicklime in an aqueous medium; (b) carbonating and neutralising the suspension of slaked lime formed in step (a) using a gas comprising carbon dioxide; and (c) separating the precipitated calcium carbonate formed in step (b) from the aqueous medium in which it is suspended. There is added 0.1% to 2% by weight, based on the weight of dry calcium oxide, of a reagent having one or more active hydrogen atoms (or a salt thereof), to the aqueous medium in which the quicklime is slaked in step (a).
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