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：US3577610A

公开(公告)日：1971-05-04

申请号：US3577610D

申请日：1968-04-16

Applicant: LITTLE INC A

Inventor： MARGOLIN STANLEY V ,  GLASER PAUL W ,  GALLAGHER LEONARD V

IPC: B28B5/02 ,  B28B5/04 ,  B28B7/08 ,  B28B23/06 ,  B28B15/00

CPC classification number: B28B23/06 ,  B28B5/022 ,  B28B5/04 ,  B28B7/08

Abstract: A system for casting prestressed concrete members on a highly automated, mass production basis. The system employs a plurality of portable molds, each of which defines a hollow mold cavity. The portable molds are preferably substantially identical in construction, include open top portions through which charges of concrete mixture can be directed into the mold cavities, and further include means for releasably securing lengths of reinforcing strand in a selected arrangement within each mold cavity. Conveying means carry a plurality of molds simultaneously along a predetermined path of travel through operating stations adapted to subject each mold to a series of successive operations. A mold cleaning and oiling station cleans the interior surfaces of each mold cavity and coats the interior surfaces with a releasing agent. An placement station inserts hardware into the mold cavities, to be cast within the concrete members. A strand placement station emplaces predetermined lengths of reinforcing strand within the mode cavities, and a tensioning station applies a selected pretensioning force to the reinforcing strand. Filling and compacting stations successively feed a measured charge of concrete mixture into each of the molds and compact the concrete charge in the molds. Means are provided to cure the concrete charge within each of the molds after the filling and compacting operations are completed. Conveyor means receive and convey a plurality of the molds simultaneously along a predetermined path of travel after the curing operation is completed. A tension releasing station operates to release the pretensioning load on the reinforcing strand emplaced within each of the molds. Means are provided downstream from the tension releasing station for preparing the molds for the removal of the cast concrete members. A demolding station operates to remove the cast concrete member from each mold. Means are also provided to finish the demolded concrete members and to prepare the empty molds for recirculation through the manufacturing system. In the preferred embodiment each operating station is provided with a portable mold, and the operating stations perform their respective operations substantially simultaneously, within a selected time interval.

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：US3062629A

公开(公告)日：1962-11-06

申请号：US5490960

申请日：1960-09-09

Applicant: LITTLE INC A

Inventor： MARGOLIN STANLEY V ,  BOWEN RUSSELL J ,  ANGELINE JOHN F ,  LAFFERT JR FREDERICK W

IPC: C10L5/04 ,  C10L5/14

CPC classification number: C10L5/14 ,  C10L5/04

公开(公告)号：US3020149A

公开(公告)日：1962-02-06

申请号：US80507059

申请日：1959-04-08

Applicant: LITTLE INC A

Inventor： SCOTT OLD BRUCE ,  WARREN HYDE RICHARD ,  MEISSNER HERMAN P ,  MARGOLIN STANLEY V ,  SCHORA JR FRANK C

IPC: C21B13/00

CPC classification number: C21B13/0033 ,  Y02P10/136