Patent ID: 8603929
Filing Date: 2013-12-10
Classification: C01B,Y02P

Abstract:
1. A process for producing a hexagonal zirconium phosphate powder represented by Formula [1] below, comprising a first step of dispersing a zirconium carbonate powder containing hafnium in an aqueous solution comprising phosphate ion and at least one of ion selected from an alkali metal ion, an alkaline earth metal ion, and ammonium ion, and thermally aging by a wet method, and a second step of heating by a dry method; in Formula [1], M denotes at least one of ion selected from an alkali metal ion, an alkaline earth metal ion, ammonium ion, and hydrogen ion, a, b, and c are numbers, with 1.75<b+c<2.25, that satisfy a+4(b+c)=9 when M is monovalent and that satisfy 2a+4(b+c)=9 when M is divalent, a and b are positive numbers, c is 0.01 to 0.2, and n is 0 or a positive number not greater than 2.