Appeal No. 1997-0229
Application No. 08/039,260
filler and pigment component, by passing the accept
component through an 80 to 300 µm mesh screen for
separation of the fiber component and through a
screen with a mesh size greater than 45 µm for
separation of the agglomerate component, and
returning the fiber component and the filler and
pigment component into the raw material processing
step of the paper, pulp board or cardboard
manufacturing process.
The appealed claims, as represented by claim 11, is drawn
to a process for the recovery of raw materials for the
manufacture of paper, pulp board and cardboard from the
residual waste water slurry of a mechanical clarification
apparatus or separation apparatus by separating the slurry
into a fiber-rich portion and a filler-rich portion
(specification, page 1, line 3). In general terms, the
process comprises the sequential steps of: (a) adjusting the
solids content of the waste water slurry to a value of 1 to 5%
by weight by adding mechanically clarified waste water to form
a homogeneous suspension; (b) separating the coarse
contaminant component of the suspension by passing it through
a 1 to 2 mm mesh screen; (c) separating black particle
components of the coarse contaminant component having the
recited particle sizes by centrifugation in a particular
hydrocyclone or in a particular plurality of hydrocyclones
3
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