Precipitated calcium carbonate from kraft pulp lime mud for use in filled and coated paper
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United States of America Patent
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Issued Date -
Mar 6, 2008
app pub date -
Sep 1, 2006
filing date -
Sep 1, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A process produces PCC from lime mud generated in the kraft pulping process. The process includes providing an aqueous suspension of lime mud, neutralizing the lime mud suspension, separating grit particles from the lime mud suspension, dewatering the lime mud suspension to produce dewatered lime mud solids, washing the dewatered lime mud solids to produce washed lime mud solids, and milling the washed lime mud solids to produce a PCC suitable for use as a filler and/or coating pigment for paper and paperboard.
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