| 摘要 |
PURPOSE:To economically obtain fine particle powder of sodium hexatitanate having excellent dispersibility and narrow particle size distribution, by spray- drying a mixed slurry of a titanium raw material compound and a sodium raw material compound, calcining, treating the prepared product with water, adjusting the slurry to a proper pH with an acid and heat-treating. CONSTITUTION:A mixed slurry shown by the general formula: Na2O.nTiO2 (n=2-4) of a titanium raw material compound and a sodium raw material compound blended is spray-dried and calcined at 700-1,100 deg.C to form granules comprising fine particles sodium titanate. Then the granular product is immersed in water or warm water, fine particles of sodium titanate is separated into single particles and the slurry is adjusted to pH 7.5-8.5 by adding an acid so that slurry is subjected to composition change treatment to make the composition of fine particles of sodium titanate shown by the formula Na2O.6TiO2.nH2 O. Then the fine particles subjected to composition change are dehydrated under heating at >=500 deg.C.
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