Process and device for aerating suspensions
AssigneeAndritz Inc.
InventorHelmuth Gabl
Life of this patent
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Abstract
The disclosure relates to a process and device for aerating suspensions, particularly to flotate them, for example in deinking of pulp suspensions which includes a primary and secondary stage. In order to improve ash removal, a washing process is interposed between the primary and secondary stages.
Claims9
A process in an aeration plant comprising a suspension feed inlet, and at least one primary flotation stage and at least one secondary flotation stage, for removing particulate impurities from a feed flow suspension of recoverable solids by passing the feed as an impure fluid flow through said flotation stages, collecting and discharging the flotated impurities through an overflow line, and discharging the purified suspension through an accepts line, wherein the improvement comprises
- feeding the suspension to at least one primary cell where a primary cell overflow is passed to said overflow line,
- collecting and removing impurities from the overflow line, to produce a washed flow having reduced impurities,
- feeding the washed flow to at least one secondary cell where impurities are separated from a secondary accepts flow, and
- passing the secondary accepts flow to a primary cell.
Dependencies are inferred from the claim text.