Separation of fibre pulp suspensions containing relatively heavy contaminants
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United States of America Patent
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Jul 29, 2008
Grant Date -
Nov 2, 2006
app pub date -
May 10, 2005
filing date -
Apr 29, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A hydrocyclone unit for separating a fibre pulp suspension containing relatively heavy contaminants has an elongate tapering separation chamber, an inlet member that feeds the suspension tangentially into the separation chamber at a base end, so as to form a vortex in the separation chamber, a reject fraction outlet at the apex end of the separation chamber for discharging a reject fraction containing heavy contaminants, and a central accept fraction outlet at the base end for discharging a central fraction containing fibres. A fluid injection member is adapted to inject a fluid tangentially into the separation chamber at a distance from the apex end which is at least 40% of the length of the separation chamber, such that the injected fluid increases the rotational speed of a portion of the vortex in the chamber to increase the separation efficiency with respect to fibres existing in the vortex portion.
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