Process for aerating dispersions
AssigneeAndritz Inc.
InventorsBernhard Scherzinger, Helmuth Gabl
Life of this patent
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Abstract
A device and process for aerating dispersions, particularly for flotation of pulp suspensions, in a de-inking process where the pulp suspension containing dirt particles is sprayed into a tank together with air. The air is injected at a minimum of two successive points and mixed with the suspension.
Claims10
Process for aerating pulp suspensions in a de-inking process with an injector having oppositely disposed inlet and discharge ends and an injection channel extending longitudinally from the inlet end to the discharge end, the injection channel having a first suction point and at least one, longitudinally spaced subsequent suction point, each of the suction points defining a suction stage, the process comprising the steps of:
- receiving pulp suspension in the inlet end of the injector
- injecting a quantity of air into the pulp suspension in the injection channel by
- sucking in air at the first suction stage, and
- sucking in air at each subsequent suction stage,
- mixing the air with the pulp suspension after each suction stage;
- and
- discharging the mixed air and pulp suspension into a tank.
An aerating device for use in a flotation unit for de-inking pulp suspensions comprising a first injector defining an injection channel, the injection channel having inlet and discharge ends defining a flow direction and at least a first suction point and a second suction point arranged in series in the flow direction.
Dependencies are inferred from the claim text.