Method of preparing alumina ceramic prilling powder for sealed ring

The invention relates to a preparation method for alumina ceramic granulated powder used by a sealing ring, which is characterized in that the preparation process comprises: (1) weighting and mixing alpha alumina, silicon powder, light calcium carbonate, kaolin, burning talc magnesia and yttria, carrying out dry milling, crashing and uniformly mixing; (2) placing the uniformly mixed powder in a ball mill, diluting, adding a dispersant, a binder and a release agent and milling into slurry; (3) screening the milled slurry, removing iron, putting in a spray drying tower to carry out spray granulation; and (4) screening the spray granulated powder by a 40-mesh screen and a 200-mesh screen, taking the powder between the two screens as the finished product. The granulated powder prepared by the method of the invention has the advantages of solid granule, reasonably distributed granularity, large loose packed density, moderate strength, good fluidity and easy mold release. Moreover, the alumina sealing ring can be p