PRCESS FOR PRODUCING HIGH-PURITY A-ALUMINA

摘要

Abstract Provided is a process for producing a high-purity α-alumina in which an Si content, an Fe content, a Ca content, and an Na content are simulatenously removed. The high-purity a-alumina is produced by burning aluminum hydroxide having an Na content of 0.11 mass% or less, an Fe content of 6 ppm or less, a Ca content of 1.5 ppm or less, and an Si content of 10 ppm or less as impurities in terms of alumina respectively, and having an average particle diameter of 55 µm or less at a burning temperature of 1,100 to 1,500°C by using a burning vessel containing AI2O3 in a range of 85 to 93 wt% andSiO2 in a range of 7 to 14 wt%, and subjecting the obtained a-alumina to wash treatment.