Process for reductive bleaching of alkaline earth metal carbonates
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United States of America Patent
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Issued Date -
Jun 10, 2004
app pub date -
Feb 4, 2004
filing date -
Feb 13, 2001
priority date (Note) -
Abandoned
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Abstract
A process for improving the brightness of an alkaline earth metal carbonate utilizing formamidine sulfinic acid or sodium dithionite as a reductive bleaching agent is disclosed. Where the alkaline earth metal carbonate is calcium carbonate, addition of the reductive bleaching agent to an aqueous slurry of the calcium carbonate takes place prior to, during, or after formation of the carbonate, which is chosen from at least one of a precipitated calcium carbonate and a ground calcium carbonate.
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