Method for separating coarse grained and agglomerate pigment particles from a suspension
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United States of America Patent
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Nov 28, 1989
Grant Date -
N/A
app pub date -
Jul 18, 1988
filing date -
Oct 15, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for separating coarse grained and agglomerated pigment particles from a suspension containing coarse grained, agglomerated, and fine grained pigment particles by sedimentation by gravity, are described. The suspension, for example of titanium dioxide powder and water, is introduced through an inflow device (3) at the bottom (4) of a vessel (1) from below and flows upwardly through the vessel (1), in which stationary plates (2) are located arranged parallel to each other and at an angle of <90.degree., preferentially 40.degree. to 60.degree. to the horizontal line. In the upper part (6) of the vessel (1) the suspension which there contains primarily fine grained pigment particles is removed from the vessel (1) through a drain or overflow device (5). In the lower part (4) the suspension containing primarily coarse grained and agglomerated pigment particles is removed from the vessel (1) through an overflow device (7). With the continuous method and with the apparatus according to the invention better separation of coarse grained and agglomerated pigment particles is achieved, compared with the prior art, that is, finer grained pigment particles suitable for the purpose of imparting a mat surface in the chemical fiber industry (man-made fiber industry) obtained.
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