Classifying – separating – and assorting solids – Fluid suspension – Liquid
Patent
1996-09-25
1998-06-16
Lithgow, Thomas M.
Classifying, separating, and assorting solids
Fluid suspension
Liquid
209 17, 209170, 162 4, 2102212, 210295, B03D 124, B03B 700
Patent
active
057664480
ABSTRACT:
A pressure screening system for processing contaminated pulp fiber including a pressure screen apparatus for separating an accepts stream of clean fiber from a rejects stream carrying contaminants, and a feed tank for supplying a pulp fiber slurry to the inlet of the pressure screen apparatus, wherein the feed tank has a flotation section for receiving the rejects stream together with air for generating a froth separating a rejects overflow of contaminants from the remainder of the feed stock for recovery of additional pulp fiber from the rejects stream. The air may be contained in the rejects stream when it enters the flotation section, or it may be introduced at or near the input to the flotation section. The feed tank with flotation section can receive the rejects streams from multiple pressure screen stages, or a separate feed tank can be used for each pressure screen stage. The improved system reduces pulp fiber losses and reduces the equipment cost and complexity of the conventional feed tank and rejects stream handling arrangement. The flotation section is preferably formed as a standpipe connected to the feed tank, or may be a separate flotation cell coupled through a pump or a valve to the feed tank.
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International Paper Company
Lithgow Thomas M.
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