PRODUCTION OF POROUS GLOBULAR TITANIUM OXIDE PARTICLE

摘要

PURPOSE: To increase specific surface area of porous globular titanium oxide particles by adding urea to an aqueous solution of titanyl sulfate containing a specific amount of titanyl sulfate and excess sulfuric acid of a prescribed molar ratio to Ti and heating the mixture, recovering deposited meta-titanic acid particles and baking the particles. CONSTITUTION: Titanium ore such as ilmenite is heated with concentrated sulfuric acid and water is added thereto to subject to immersing treatment. The insoluble matter is removed and urea in an equimolar amount, especially 1.5-3 times by mol based on the total sulfuric radical is added to an aqueous solution of titanyl sulfate containing titanyl sulfate in an amount of 5.0-100g/l expressed in terms of TiO2 and excess sulfuric acid of 1.0-3.0 times molar ratio to Ti. The mixed aqueous solution is heated to about 85 deg.C to boiling point at normal pressure to hydrolyze titanyl sulfate and deposite meta-titanic acid particles. The deposited material is filtered and washed with water and baked at 650-850 deg.C to provide the objective porous globular anatase type TiO2 particles having 2.5-5.5μm average particle diameter and >=30m<2> /g specific surface area.