公开(公告)号：US3211524A

公开(公告)日：1965-10-12

申请号：US34102164

申请日：1964-01-29

Applicant: LITTLE INC A

Inventor： HYDE RICHARD W ,  MARGOLIN STANLEY V

IPC: C01F7/24 ,  C22B21/00

CPC classification number: C22B21/0015 ,  C01F7/24 ,  Y02P10/234

公开(公告)号：US2990269A

公开(公告)日：1961-06-27

申请号：US79997259

申请日：1959-03-17

Applicant: LITTLE INC A

Inventor： HYDE RICHARD W

IPC: C21B13/00

CPC classification number: C21B13/0033 ,  Y02P10/136

公开(公告)号：US3586481A

公开(公告)日：1971-06-22

申请号：US3586481D

申请日：1968-10-16

Applicant: LITTLE INC A

Inventor： HYDE RICHARD W ,  MARGOLIN STANLEY V

IPC: C01F7/24 ,  C01F7/02

CPC classification number: C01F7/24

Abstract: A METHOD FOR CONVERTING THE ALUMINUM CONTAINED IN CLAYS TO A-ALUMINA WHICH IS OF SUFFICIENT PURITY TO PERMIT ITS DIRECT REDUCTION TO ALUMINUM METAL IN A HALL ELECTROLYTIC CELL. THE METHOD INCLUDES CALCINING THE ALUMINUMCONTAINING CLAY LEACHING THE CALCINED CLAY WITH AQUEOUS NITRIC ACID, FLOCCULATING THE INSOLUBLE IMPURITIES TO AID IN THEIR SEPARATION BY SETTLING AND FILTRATION, CONTACTING THE FILTRATE WITH AN ION-EXCHANGE LIQUID TO REMOVE THE SOLUBLE FERRIC IRON ALONG WITH OTHER METALLIC IMPURITIES, INTRODUCING THE SUBSTANTIALLY PURE ALUMINUM NITRATE SOLUTION INTO A FLUIDIZED BED OF THE PRODUCT ALUMINA MAINTAINED AT A TEMPERATURE PREFERABLY BETWEEN ABOUT 200 AND 210*C., AND HAVING A FLUIDIZING GAS CONTAINING A CONTROLLED AMOUNT OF WATER VAPOR TO HYDROLYZE THE ALUMINUM NITRATE, THUS MAKING IT POSSIBLE TO REMOVE ABOUT 90 TO 95% OF THE NITRATE AS NITRIC ACID VAPOR, AND FINALLY HEATING THE HYDROLYZED DRY PRODUCT FROM THE FLUIDIZED BED TO DRIVE OFF THE REMAINING NITRATE AS OXIDES OF NITOGEN, AND CONVERTING THESE SOLIDS TO A-ALUMINA.

公开(公告)号：US3228669A

公开(公告)日：1966-01-11

申请号：US21427462

申请日：1962-08-02

Applicant: LITTLE INC A

Inventor： OLD BRUCE S ,  HYDE RICHARD W ,  SCHORA JR FRANK C

IPC: B01J8/28 ,  C21B13/00

CPC classification number: B01J8/28 ,  C21B13/0033 ,  Y02P10/136