Process for preparing a particulate ceramic material

Abstract

A process for preparing a particulate ceramic material comprising the steps of: (a) adding carbon dioxide or an aqueous solution of a soluble carbonate to first aqueous solution of a nitrate or chloride of Ba, Sr, Ca or Mg in a first vessel to adjust the pH of said first aqueous solution to between 7 and 10 thereby forming a carbonate precipitate; (b) adding an aqueous solution of a soluble hydroxide to a second aqueous solution of a nitrate or chloride of Ti, Zr, Sn or Pb in a second vessel to adjust the pH of said second aqueous solution to between 7 and 10 thereby forming a hydroxide precipitate; (c) combining slurries containing the precipitates formed in said first and second vessels; (d) mixing the combined slurries; (e) passing the slurries through a filter; (f) washing the filter cake with water; (g) drying the filter cake to form a powder; (h) calcining the dried powder; and (i) grinding the calcined powder.

Dependencies are inferred from the claim text.