公开(公告)号：US3705223A

公开(公告)日：1972-12-05

申请号：US3705223D

申请日：1971-07-28

Applicant: ALUMINUM CO OF AMERICA

Inventor： PEARSON ALAN ,  MARHANKA JOHN E

IPC: C04B35/622 ,  D01F9/08 ,  C04B33/18 ,  C04B35/10

CPC classification number: C04B35/62236 ,  C04B35/62231 ,  Y10S264/19

Abstract: USING DISPERSING AGENTS, SLIPS FORMED OF A VOLATILE FLUID AND CONTAINING 80 TO 90% OF DISCRETE ALPHA ALUMINA PARTICLES WITH A MEDIAN DIAMETER OF 0.3 TO 2.5 MICRONS AND HAVING A VISCOSITY ABOVE 5000 CENTIPOISE ARE MADE. THE SLIP IS THEN FORMED INTO THREADS IN AN EVAPORATIVE ENVIRONMENT TO CONCURRENTLY REMOVE A PORTION OR ALL OF THE LIQUID INGREDIENT THUS FORMING SELF SUPPORTING FIBERS WHICH ARE THEN SINTERED.

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％。