تفاعل #816359
ord-28ff471c8006409c91ed74f1af17e346
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الإجراء التجريبي
Titanium-containing ore was dissolved in sulfuric acid to obtain a titanium sulfate solution. To hydrated titanium oxide obtained by hydrolysis of the titanium sulfate solution, 0.50 part by weight of ammonium phosphate, 0.30 part by weight of potassium sulfate and 0.30 part by weight of aluminum sulfate were added per 100 parts by weight of TiO2, and the hydrated titanium oxide was heated to a product temperature of 1,020° C. in a laboratory rotary muffle furnace. Titanium dioxide fine particles thus formed were cooled to room temperature, and observation thereof with a transmission electron microscope revealed that they had an anatase structure and a primary particle diameter of 0.13 μm. 1,500 g of the titanium dioxide fine particles having been surface-treated and 1,000 g of isopropyl alcohol (hereinafter, referred to as IPA) were mixed to obtain slurry, and the slurry was dispersed for 2 hours in a sand mill (produced by Yasukawa Manufacturing Co., Ltd.) in which zirconium beads were charged in an amount 1.5 times the slurry. The beads were removed from the slurry to obtain a 60% by weight IPA dispersion liquid (A) of titanium dioxide fine particles (B) used in a white ink for ink-jet recording.