Method for starting aluminum electrolytic cells with selfbaking anode and current supplying studs

Claim 1

THE METHOD OF PUTTING INTO OPERATION AN ALUMINUM ELECTROLYTIC REDUCTION CELL HAVING A SELF-BAKING ANODE AND HAVING A CARBON BOTTOM, WHICH METHOD COMPRISES ASSEMBLING IN THE CELL BEFORE PUTTING THE CELL INTO OPERATION AN EMBRYO ANODE UNIT COMPRISING A SHEET METAL CUP WHICH CONTAINS AN UNBAKED CARBONACEOUS MASS ADAPTED TO FORM THE ANODE UPON BAKING AND WHICH RESTS INITIALLY ON THE CARBON BOTTOM OF THE CELL, CURRENT SUPPLY CONTACT STUDS EXTENDING INTO SAID CARBONACEOUS MASS, AND PARTIALLY COKED CARBON BODIES MADE OF A MATERIAL COMPATIBLE WITH THE CARBONACEOUS MASS TO INSURE A STRONG BOND BETWEEN SAID MASS AND SAID CARBON BODIES UPON BAKING, AND DISPOSED BETWEEN THE LOWER ENDS OF THE CONTACT STUDS AND THE BOTTOM OF THE SHEET METAL CUP, SAID CARBON BODIES HAVING A DIAMETER SUBSTANTIALLY GREATER THAN THAT OF THE LOWER PART OF THE CONTACT STUDS, AND IN THE INITIAL STAGES HAVING HIGH RESISTANCE BUT NEVERTHELESS FORMING GOOD ELECTRICAL CONNECTIONS BETWEEN THE STUDS AND THE BOTTOM OF THE METAL CUP, AND PASSING AN ELECTRIC CURRENT IN SERIES THROUGH THE CONTACT STUDS, THROUGH SAID PARTIALLY COKED CARBON BODIES, THROUGH THE BOTTOM OF THE SHEET METAL CUP AND THROUGH THE CARBON BOTTOM OF THE ELECTROLYTIC CELL TO CAUSE THE CARBON BODIES AND AT THE SAME TIME THE CARBONACEOUS MASS TO BE BAKED AND COKED INTO AN INTIMATELY BONDED INTEGRATED UNIT.

Claim 2

THE METHOD OF PUTTING INTO OPERATION AN ALUMINUM ELECTROLYTIC REDUCTION CELL HAVING A SELF-BAKING ANODE AND HAVING A CARBON BOTTOM, WHICH METHOD COMPRISES ASSEMBLING IN THE CELL BEFORE PUTTING THE CELL INTO OPERATION AN EMBRYO ANODE UNIT COMPRISING A SHEET METAL CUP WHICH CONTAINS AN UNBAKED CARBONACEOUS MASS ADAPTED TO FORM THE ANODE UPON BAKING AND WHICH RESTS INITIALLY ON THE CARBON BOTTOM OF THE CELL, CURRENT SUPPLY CONTACT STUDS EXTENDING INTO SAID CARBONACEOUS MASS, AND PARTIALLY COKED CARBON BODIES MADE OF A MATERIAL COMPATIBLE WITH THE CARBONACEOUS MASS TO INSURE A STRONG BOND BETWEEN SAID MASS AND SAID CARBON BODIES UPON BAKING, AND DISPOSED BETWEEN THE LOWER ENDS OF THE CONTACT STUDS AND THE BOTTOM OF THE SHEET METAL CUP, SAID CARBON BODIES HAVING A DIAMETER SUBSTANTIALLY GREATER THAN THAT OF THE LOWER PART OF THE CONTACT STUDS, AND IN THE INITIAL STAGES HAVING HIGH RESISTANCE BUT NEVERTHELESS FORMING GOOD ELECTRICAL CONNECTIONS BETWEEN THE STUDS AND THE BOTTOM OF THE METAL CUP, AND PASSING AN ELECTRIC CURRENT IN SERIES THROUGH THE CONTACT STUDS, THROUGH SAID PARTIALLY COKED CARBON BODIES, THROUGH THE BOTTOM OF THE SHEET METAL CUP AND THROUGH THE CARBON BOTTOM OF THE ELECTROLYTIC CELL TO CAUSE THE CARBON BODIES AND AT THE SAME TIME THE CARBONACEOUS MASS TO BE BAKED AND COKED INTO AN INTIMATELY BONDED INTEGRATED UNIT.