Plastic and nonmetallic article shaping or treating: processes – Formation of solid particulate material directly from molten... – By extrusion spraying or gravity fall through orifice
Patent
1996-07-12
1998-11-10
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Formation of solid particulate material directly from molten...
By extrusion spraying or gravity fall through orifice
106403, 106404, 106430, 106436, 106438, 106441, 106442, 106449, 423610, 423611, 423615, C01B 1320, C01B 1318, C09B 136
Patent
active
058338926
ABSTRACT:
In a method of producing TiO.sub.2 pigment particles a TiO.sub.a X.sub.b (OH).sub.c -based precursor is suspended in a liquid with or without fuel additives. The suspension is then sprayed to form droplets. The droplets are transported into a flow reactor with a carrier gas. The droplets are decomposed in the flow reactor at high temperatures to form TiO.sub.2 pigment particles which are collected downstream of the flow reactor. In a preferred embodiment, a colloidal suspension of an insoluble TiO(SO.sub.4).sub.b (OH).sub.c precipitate with suitable fuel additives was spray-calcined at 900.degree. to 1200.degree. C. to produce pigment-quality TiO.sub.2. The primary particle size of the TiO.sub.2 pigment particles is between 150-250 nm and the particles are minimally aggregated.
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Anderson Bruce M.
Gurav Abhijit S.
Kodas Toivo T.
Derrington James
Huckett Gudrun E.
Kemira Pigments, Inc.
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