Sulfuric Acid → Titanium disulfate

Participants

Reaction Steps

A titanium-containing ore was dissolved in sulfuric acid to obtain a titanium sulfate solution. To a hydrous titanium oxide obtained by hydrolyzing the titanium sulfate solution were added 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 relative to 100 parts by weight, and the hydrous titanium oxide was heated in a laboratory rotary muffle furnace until the product temperature reached 1,020° C. When the resulting titanium dioxide fine particles were cooled to room temperature and observed on a transmission electron microscopic photograph, it was found that the particle was anatase type one having an average primary particle size of 0.13 μm. Then, 1500 g of the surface-treated titanium dioxide fine particles and 1000 g of isopropyl alcohol (hereinafter referred to as IPA) were mixed with each other and zirconium beads (1.0 mm) was charged thereto in an amount of 1.5 times the weight of the slurry in a sand mill (manufactured by Yasukawa Seisakusho). After 2 hours of dispersion, the beads were removed to obtain a 60 wt % IPA dispersion of titanium dioxide fine particles (white pigment) (Dispersion I) for use in a white ink for inkjet.

Provenance & Evidence