Process for recovering raw materials from paper industry mechanical waste sludge
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United States of America Patent
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-
Mar 27, 2001
Grant Date -
N/A
app pub date -
Apr 15, 1993
filing date -
Oct 26, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Raw materials useable in the manufacture of paper, cardboard and carton are recovered from waste sludge. After precipitation of the coarse particles, the sludge is centrifuged to remove black particles and then divided by fractional screening into its fiber, filler, pigment and agglomerate components. The agglomerate component is shear-treated and again fractionated, while the fibers, fillers and pigments, following further treatment if necessary, are fed to their points of reuse.
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Cited Art Landscape
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