Production method of the hydrated zirconia sol, hydrated zirconia powder and zirconium oxide powder

摘要

PURPOSE:To produce hydrated zirconia sol, hydrated zirconia powder and zirconium oxide powder in improved productivity by carrying out hydrolysis reaction in a short time and to produce a hydrated zirconia sol having high hydrolysis ratio which is hardly attainable by conventional technique (giving low content of unreacted material and non-grown hydrated zirconia in the reaction liquid) and, accordingly, to obtain hydrated zirconia sol, hydrated zirconia powder and zirconium oxide powder having high performance. CONSTITUTION:An aqueous solution of a water-soluble zirconium salt is hydrolyzed by boiling under refluxing and further hydrolyzed under concentration to obtain a hydrated zirconia sol. Hydrated zirconia powder can be produced by drying the sol and zirconium oxide powder is produced by calcining the hydrated zirconia powder.