公开(公告)号：US3859427A

公开(公告)日：1975-01-07

申请号：US19562271

申请日：1971-11-04

Applicant: ALUMINUM CO OF AMERICA

Inventor： FRANCIS THOMAS L ,  MACZURA GEORGE

IPC: C01F7/02 ,  C04B35/113 ,  C01F7/04 ,  C01F7/16

CPC classification number: C04B35/113 ,  C01F7/028 ,  C01P2004/61 ,  C01P2004/62

Abstract: Production of high-purity beta alumina by reacting a critical combination of alumina hydrate or calcined alumina or a mixture of these two, a source of oxide other than aluminum oxide, and a source of fluoride.

公开(公告)号：US3432313A

公开(公告)日：1969-03-11

申请号：US3432313D

申请日：1964-10-22

Applicant: ALUMINUM CO OF AMERICA

Inventor： GITZEN WALTER H ,  MACZURA GEORGE

IPC: C04B33/02 ,  C04B35/10 ,  C04B33/26

CPC classification number: C04B33/025 ,  C04B33/02 ,  C04B35/10

公开(公告)号：US3655339A

公开(公告)日：1972-04-11

申请号：US3655339D

申请日：1969-07-18

Applicant: ALUMINUM CO OF AMERICA

Inventor： MACZURA GEORGE ,  PEARSON ALAN

IPC: C01F7/46 ,  C01F7/02

CPC classification number: C01F7/46 ,  C01P2006/12

Abstract: Production of a low-soda alumina by calcining an alumina starting material of low-soda content at 1,100*-1,400* C followed by leaching. The starting alumina material contains less than 0.25 percent by weight soda, and the final alumina contains less than 0.1 percent by weight soda. The calcining is continued until the product is at least 75 percent by weight alpha alumina. Reduction in amount of soda from the alumina starting material to the final alumina product is at least 75 percent.

Abstract translation: 通过在1,100°-1,400℃煅烧低苏打含量的氧化铝原料，然后浸出，生产低苏打氧化铝。 起始氧化铝材料含有少于0.25重量％的苏打，最终的氧化铝含有小于0.1重量％的苏打。 继续煅烧，直到产物为至少75重量％的α氧化铝。 从氧化铝原料到最终氧化铝产品的苏打水量的减少至少为75％。

公开(公告)号：US3516840A

公开(公告)日：1970-06-23

申请号：US3516840D

申请日：1968-10-31

Applicant: ALUMINUM CO OF AMERICA

Inventor： GITZEN WALTER H ,  MACZURA GEORGE

IPC: C04B33/02 ,  C04B35/10

CPC classification number: C04B33/025 ,  C04B33/02 ,  C04B35/10