公开(公告)号：US20190062174A1

公开(公告)日：2019-02-28

申请号：US16115143

申请日：2018-08-28

申请人： Polar Sapphier Ltd.

发明人： Scott Nichol ,  Daniel Smith

IPC分类号： C01F7/44 ,  C01F7/20 ,  C04B35/043 ,  C01F7/30 ,  C01F7/02 ,  C01F7/56 ,  C04B35/111

摘要： A method comprises reacting an aluminum feedstock with an acid in the presence of water to provide an aluminum salt solution comprising an aluminum salt in water, wherein the aluminum salt comprises a reaction product of the acid and aluminum, and spray roasting the aluminum salt solution at a temperature of at least about 450° C. to provide an aluminum oxide powder, wherein the spray roasting is performed in a furnace lined with a refractory comprising alumina that is at least about 99.2% purity alumina, and wherein the aluminum oxide powder is 99.2% pure aluminum oxide or greater.