Process for preparation of high opacity precipitated calcium carbonate by reacting sodium carbonate with calcium hydroxide
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United States of America Patent
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Nov 15, 1994
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Jun 15, 1993
filing date -
Jun 15, 1993
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Abstract
In the process for making calcium carbonate by the double decomposition reaction of sodium carbonate and calcium hydroxide in aqueous reaction medium the improvement of producing calcium carbonate having a scalenohedral particle shape and a rosette aggregate structure comprising adding said sodium carbonate in more than one stream to said calcium hydroxide over a period of 1 to 8 hours and maintaining said reaction medium in the range of 80.degree. to 140.degree. F.
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