Classifying – separating – and assorting solids – Plural – diverse separating operations – Aqueous suspension and sifting
Patent
1994-07-15
1996-11-19
Bollinger, David H.
Classifying, separating, and assorting solids
Plural, diverse separating operations
Aqueous suspension and sifting
209270, 209273, B03B 700
Patent
active
055753957
ABSTRACT:
A fiber suspension, such as an in a pulp mill, is treated in an manner which minimizes both the investment and the operating costs associated with a screening plant. A single pump has an outlet connected to a knotter and primary and secondary screening states so that the pump provides substantially the sole motive force to the pulp moving it through the knotter and screening stages. The knotter and screening stages are provided in a common housing with the knotter vertically above the screening stages, and the screening stages one above the other. A single motor may be provided to rotate rotatable elements associated with the knotter and screening stages. The knotter may be connected to a knot washer external of the housing by a valved conduit less than two meters in length, and the secondary screening stage can be connected to a tertiary screening stage exterior of the housing by a valved conduit less than two meters long. Rejects from the knot washer and secondary screening stage may be recycled to the pulp inlet, and dilution water may be introduced where necessary.
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Alajaaski Timo
Henricson Kaj
Laakso Kalevi
Laine Antero
Ljokkoi Risto
A. Ahlstrom Corporation
Bollinger David H.
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