Conversion of pulp and paper mill waste solids to a papermaking filler product
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United States of America Patent
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Jul 26, 1994
Grant Date -
N/A
app pub date -
Jan 19, 1993
filing date -
Jan 19, 1993
priority date (Note) -
Expired
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Abstract
A process for the production of a papermaking filler product from the fiber fines/clay fraction of a pulp, paper, paperboard, or deinking mill waste solids such process comprising the reaction of said solids with sufficient acid to lower and maintain a pH of less than 5.0. Such process yields improvement in the drainage characteristics of the material. Bleach can be added or the pH raised back to neutral to further improve the specific resistance and/or brightness of the material.
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