Appeal No. 1997-0229
Application No. 08/039,260
CFR § 1.116” filed March 13, 1995 (Paper No. 14), which the
examiner entered (advisory action of April 11, 1995, Paper No.
15).
Claim 11 is illustrative of the claims on appeal and is
reproduced below:
11. The method of recovering raw material for
the manufacture of paper, pulp board or cardboard
from the residual waste water slurry of a mechanical
clarification or separation apparatus by separating
said slurry into a fiber-rich portion and a filler-
rich portion, which comprises the sequential steps
of
a) adjusting the solids content of said 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 said suspension by passing it through a 1 to 2 mm
mesh screen,
c) separating the black particle components of
said coarse contaminant component having a particle
size greater than 10 micrometers by centrifugation
in a hydrocyclone or in a plurality of hydrocyclones
connected in series or in parallel, said
hydrocyclones having a nominal diameter of 10 to 100
mm, and accept nozzle diameter of 7 to 14 mm and a
reject nozzle diameter of 2 to 8 mm, the input
pressure on the inlet side of said hydrocyclone or
hydrocyclones being between 0.5 and 6 bar,
d) fractionally separating the accept component
exiting from the hydrocyclone or hydrocyclones into
a fiber component, an agglomerate component and a
2
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