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.
Claims17
In an aeration plant having a suspension feed inlet, and at least one primary flotation stage and at least one secondary flotation stage, a process 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 removing some of said impurities by washing at least a portion of said impure fluid flow between the primary and secondary stages.
5 The process according to claim 1 wherein each of the flotation stages include at least one cell with an internal flow loop, said internal flow loop mixing air with a portion of said impure fluid flow for aeration injection into said cell.
An aeration plant having a suspension feed inlet, means for removing particulate impurities from a feed suspension of recoverable solids by passing the feed as an impure fluid flow through at least one primary flotation stage and at least one secondary flotation stage, means for collecting and discharging the flotated impurities through an overflow line, and means for discharging the purified suspension through an accepts line, wherein the improvement comprises a washer for removing some of the impurities in at least a portion of the impure fluid flow between said primary and secondary stages.
Dependencies are inferred from the claim text.