公开(公告)号：US4940571A

公开(公告)日：1990-07-10

申请号：US176582

申请日：1988-04-01

申请人： Sophia R. Su ,  Leo F. Fitzpatrick ,  Sheryl A. Robillard

发明人： Sophia R. Su ,  Leo F. Fitzpatrick ,  Sheryl A. Robillard

IPC分类号： C01B33/16 ,  C01B33/18 ,  C03C1/00

CPC分类号： C01B33/18 ,  C01B33/163 ,  C03C1/00 ,  C01P2002/02 ,  C01P2004/51 ,  C01P2006/10 ,  C01P2006/11 ,  C01P2006/12 ,  C01P2006/80 ,  C01P2006/82

摘要： A method of making large particle size, high purity, dense silica is described. Tetraethylorthosilicate ethanol solution is added to a 2N ammonium hydroxide solution containing silicic acid having an average particle size of about 15 micrometers to form a precipitate followed by a digestion of the precipitate in the solution. The precipitate is filtered through a screen having 45 micrometer openings and dried to form a dried powder. The dried powder is then calcined in an oxygen atmosphere followed by densifying it by heating at a temperature of about 1200.degree. C. in air to form a large particle size, high purity, dense silica.