The invention relates to the field of
zirconium oxide ceramic powder preparation, in particular to a method for removing Cl <-> in
zirconium oxide powder, which is characterized by comprising the following steps: S1, putting
zirconium salt into water, stirring and heating to prepare a zirconium
salt solution; s2, mixing the zirconium
salt solution and
ammonia water, adjusting the pH value to 7-7.5, continuously adding the
ammonia water solution, adjusting the pH value of the solution to 9-10, and stirring the mixture to prepare
slurry; s3, washing the
slurry until the content of Cl <-> in the
slurry is lower than 300ppm, and then carrying out filter pressing to obtain a
filter cake; s4, calcining the
filter cake to obtain calcined
powder; and S5, mixing the calcined powder with a hot acid solution, carrying out ball milling and sand milling, carrying out
spray granulation, and sieving the granules to obtain the
zirconium oxide powder. According to the method, hot acid is added during ball milling of the calcined powder to break the acid-base balance of a solution, so that the powder is further cleaned, the content of Cl <-> in the powder is reduced, and hard agglomeration of the powder can be obviously reduced; therefore, the purity,
sintering activity and the like of the powder can be improved, the permeability probability of parts made of the powder can be obviously improved, the
sintering temperature can be reduced, and the cost can be saved.