Purified Precipitated Calcium Carbonate and Purified Calcium Silicate Compounds, a Method for Their Production, and Their Use as Paper Fillers
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United States of America Patent
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Issued Date -
Dec 7, 2006
app pub date -
May 23, 2006
filing date -
Jan 31, 2001
priority date (Note) -
Abandoned
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Abstract
Methods for the production of high purity calcium carbonate and high purity calcium silicate. Products are washed before introduction into a paper machine furnish, to avoid filler loss and brightness reversion. In one embodiment, multiple superatmospheric reactors may be provided, for switching production between reactors, and advantageously utilizing process waste heat. On site production of both precipitated calcium carbonate and calcium silicate hydrates is thus achieved in a paper mill.
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