公开(公告)号：US4216010A

公开(公告)日：1980-08-05

申请号：US7986

申请日：1979-01-31

Applicant: Robert M. Kibby

Inventor： Robert M. Kibby

IPC: C22B21/02 ,  C22B21/06 ,  F27B1/08 ,  C22D3/12

CPC classification number: F27B1/08 ,  C22B21/02 ,  C22B21/06

Abstract: A method for extracting aluminum of substantial purity from furnace products resulting from carbothermic reduction of alumina-bearing ores and contaminated with up to about 30 weight percent of aluminum carbide is disclosed. The method involves contacting the furnace product with a high alumina-containing molten slag in the substantial absence of reactive carbon, so as to cause the alumina-containing slag to react with the aluminum carbide, thereby diminishing the aluminum carbide content of the furnace product.

Abstract translation: 公开了一种从含有氧化铝的矿石的碳热还原产生的并且被高达约30重量％的碳化铝污染的炉产品中提取相当纯度的铝的方法。 该方法包括在基本不存在活性炭的情况下使炉子产物与含高含氧化铝的熔渣接触，以使含氧化铝的炉渣与碳化铝反应，从而降低炉子产品的碳化铝含量。

公开(公告)号：US3875030A

公开(公告)日：1975-04-01

申请号：US39828673

申请日：1973-09-17

Applicant: REYNOLDS METALS CO

Inventor： RICHARDS NOLAN EARLE ,  BERRY JR JAMES SIMMONS

IPC: C25C3/20 ,  C22D3/12 ,  B01K3/00

CPC classification number: C25C3/20

Abstract: In a multiple anode alumina reduction cell, gas bubbles are formed on the bottom of each anode block during the reduction process and rise to the surface of the molten cryolite. The formation and subsequent release of bubbles causes variations in current flowing through the anode block. When an anode block is grounded, the rate at which gas bubbles are produced is significantly less, for a given anode block current, than when the anode block is not grounded. Apparatus is provided to sense current in the anode block and, from analysis of the variation in that current determines the presence of a ground or electronic path. The measured current varies as a result of factors other than the gas bubbles so that the measurement signal is filtered to obtain a signal whose frequency of amplitude variation is in the range of interest. A comparator compares the magnitude of the frequency signal with a reference to eliminate variations due to noise, and the comparator produces digital pulses that are fed to a first counter. The measurement signal is also fed to a voltageto-frequency converter and the output of the converter drives a second counter. The counts in the two counters are compared and the resulting signal indicates whether or not a grounded anode condition exists. A data processor automatically controls plural pot lines each having plural cells so that the measurements are taken automatically. An addressable multiplexer is provided for each cell so that only one ground detector is required for each pot line.

公开(公告)号：US3728243A

公开(公告)日：1973-04-17

申请号：US3728243D

申请日：1971-08-25

Applicant: ALUSUISSE

Inventor： SCHMIDT HATTING W

IPC: C25C3/08 ,  C25C3/16 ,  C22D3/02 ,  C22D3/12

CPC classification number: C25C3/16 ,  C25C3/08

Abstract: ELECTROLYTIC CELL FOR THE PRODUCTION OF ALUMINUM HAVING PRESCRIBED MAXIMUM HORIZONTAL DISTANCE BETWEEN OUTER LOWER EDGES OF THE ANODES AND ADJACENT WALL SURFACES OF THE POT LINING, POT LINING WITH SPECIFIED THERMAL ISOLATING POWER, CATHODE BARS INSULATED BENEATH THE SIDE WALL OF THE LINING AND SPECIFIC RATIO OF IRON CROSS SECTION TO CARBON CROSS SECTION THROUGH THE BOTTOM OF THE LINING, IN ORDER TO REDUCE THE HORIZNTAL COMPONENTS OF THE ELECTRIC CURRENT IN THE CELL.

公开(公告)号：US3723287A

公开(公告)日：1973-03-27

申请号：US3723287D

申请日：1970-09-30

Applicant: ELLIOTT C

Inventor： ELLIOTT C

IPC: C25C3/08 ,  C22D3/02 ,  C22D3/12

CPC classification number: C25C3/08

Abstract: APPARATUS FOR ALUMINA REDUCTION COMPRISING SUBSTANTIALLY VERTICAL CATHODES, ELIMINATING PREVIOUS LEACHING OF IRON INTO THE MOLTEN ALUMINUM FRO HORIZONTAL CATHODES IN THE CRUCIBLE, AND THEPREVIOUS WAVE-LIKE DISTORTIONS (RIDGING AND MOTORING) OF THIS ALUMINUM CAUSED BY MAGNETIC FORCES FROM THE HORIZONTAL CATHODES. THE COMPOSITE VERTICAL CATHODE COMPRISES: AN OUTER STEEL TUBE, FIXED TO AND EXTENDING BELOW THE CRUCIBLE SHELL; AN INNER CARBONACEOUS HOLLOW MEMBER OR CONDUIT; A CENTRAL, CURRENT-CONDUCTING MEANS IN THE CONDUIT THAT COMPRISES A LOWER ROD OF CONDUCTIVE METAL AND A PORTION OF THE MOLTEN ALUMINUM WITHIN AN UPPER PART OF THE CONDUIT. A METOD IS DISCLOSED THAT COMPRISES DROPPING A VERTICAL ROD OF ALUMINUM OR COPPER DOWNWARD IN AND THRU THE CATHODE HOLLOW MEMBER, THE REST ON A RESILIENT BASE. WHEN THIS ROD IS ALUMINUM IT PREFERABLY EXTENDS WELL ABOVE AN OUTLET TAP IN THE CONDUIT; WHEN OF COPPER ITS UPPER END IS BELOW THE TAP. THE METHOD ALSO COMPRISES WITHDRAWING MOLTEN ALUMINUM FROM THE TAP-OPTIONALLY FROM THE TEMPORARILLY CAPPED HOLLOW MEMBER (IN PURGING IT OF ALUMINA SLUDGE) OR FROM THE CRUCIBLE (IN WITHDRAWING PRODUCED ALUMINUM).

公开(公告)号：US3632488A

公开(公告)日：1972-01-04

申请号：US3632488D

申请日：1969-01-23

Applicant: REYNOLDS METALS CO

Inventor： DECKER HARVEY DAVID ,  MCGRAW JAMES EDWARD ,  BARBOUR RICHARD R

IPC: C25C3/20 ,  H05B7/156 ,  C22D3/12 ,  B01K3/00

CPC classification number: C25C3/20 ,  H05B7/156 ,  Y02P10/256 ,  Y02P10/259

Abstract: D R A W I N G
A METHOD OF CONTROLLING AN ALUMINUM REDUCTION CELL IS DISCLOSED, IN WHICH THE HEAT FLOW COEFFICIENT FOR THE BATH IS DETERMINED AND USED WITH A DESIRED BATH TEMPERATURE TO CALCULATE THE BATH''S HEAT LOSS ENERGY. CALCULATIONS ARE ALSO MADE OF THE CELL''S POWER REQUIREMENTS FOR PURPOSES OTHER THAN HEATING THE BATH SUCH AS THE ENERGY REQUIRED TO REDUCE THE CELL''S ALUMINA. THE SUM OF THE BATH HEAT LOSS AND OTHER ENERGY REQUIREMENTS IS DIVIDED BY THE CELL''S BASE AMPERAGE TO DETERMINE A SET VOLTAGE AND THE CELL''S ANODE IS ADJUSTED TO KEEP THE CELL VOLTAGE WITHIN PREDETERMINED LIMITS OF THE SET VOLTAGE.

公开(公告)号：US3616317A

公开(公告)日：1971-10-26

申请号：US3616317D

申请日：1969-09-29

Applicant: ALCAN RES & DEV

Inventor： MCLELLAN HAROLD DAVID ,  ARMOUR WALTER KEITH

IPC: C25C3/16 ,  C22D3/12 ,  C22D3/02

CPC classification number: C25C3/16

Abstract: In an aluminum pot line including plural electrolytic pots for production of aluminum metal arranged in end-to-end relationship in at least two rows and provided with electricity by plural parallel conductor bus bars arranged longitudinally of the pots, an independent bus bar at the rear of each row of pots for degaussing the magnetic field created by the electricity carried by the conductor bus bars of the opposite row of pots. The degaussing bus bar is located in substantially the same horizontal plane as the conductor bus bars and carries up to about 25 percent of the current of the latter, but in an opposing direction. The electric current of the degaussing bus bar may be subsequently cycled into the conductor bus bars.

公开(公告)号：US3582483A

公开(公告)日：1971-06-01

申请号：US3582483D

申请日：1967-09-18

Applicant: ELEKTROKEMISK AS

Inventor： SEM MATHIAS OVROM

IPC: C25C3/06 ,  C25C3/12 ,  C22D3/02 ,  C22D3/12

CPC classification number: C25C3/06 ,  C25C3/125

Abstract: AN ELECTRIC FURNACE FOR PRODUCTION OF ALUMINUM BY MELT ELECTROLYSIS IS PROVIDED WITH AN OVERHEAD ANNULAR SODERBERG ANODE HAVING A HOLLOW CENTER COEXTENSIVE WITH THE LONGITUDINAL ANODE AXIS. THE FURNACE IS OPERATED UNDER A LOAD ABOVE 100,000 AMPERES AND UP TO ABOUT 500,00 AMPERES, SAID HIGH LOAD BEING MADE POSSIBLE BY THE ANNULAR CONFIGURATION OF THE ANODE.

公开(公告)号：US3551308A

公开(公告)日：1970-12-29

申请号：US3551308D

申请日：1968-04-04

Applicant: ALUSUISSE

Inventor： CAPITAINE WOLFGANG ,  BARD MARTIN

IPC: C25C3/06 ,  C22D3/12 ,  C22D3/02

CPC classification number: C25C3/06

公开(公告)号：US3533924A

公开(公告)日：1970-10-13

申请号：US3533924D

申请日：1967-01-13

Applicant: ELEKTROKEMISK AS

Inventor： VE ARNFINN

IPC: C01F7/50 ,  C22D3/12

CPC classification number: C01F7/50

公开(公告)号：US3518172A

公开(公告)日：1970-06-30

申请号：US3518172D

申请日：1967-02-24

Applicant: DOW CHEMICAL CO

Inventor： LAYNE GILBERT S ,  HUML JAMES O ,  SMITH RICHARD DALE

IPC: C25C3/18 ,  C22D3/12

CPC classification number: C25C3/18