Electrolytic production of aluminum

Claim 1

THE METHOD OF INCREASING THE OUTPUT OF AN ELECTROLYTIC ALUMINUM REDUCTION CELL, WHICH CELL COMPRISES A CARBON ANODE, A MOLTEN ALUMINUM CATHODE AND A MOLTEN SALT ELECROLYTE CONSISTING ESSENTIALLY OF CRYOLITE AND ALUMINA, AND IN THE OPERATION OF W HICH CURRENT IS PASSED FROM SAID ANODE THROUGH SAID ELECTROLYTES TO SAID CATHODE WITH A GIVEN VOLTAGE DROP ACROSS THE CELL, WHICH METHOD COMPRISES INCORPORATING LITHIUM-CONTAINING MATERIAL IN SAID ELECTROLYTE IN AN AMOUNT TO PROVIDE IN SAID ELECTRO LYTE A LITHIUM CONTENT EQUAL TO THAT RESULTING FROM AN ADDITION OF LITHIUM FLUORIDE IN AN AMOUNT FROM ABOUT 2 TO 20 PERCENT BY WEIGHT OF THE ELECTROLYTE, AND ESTABLISHING A CURRENT FLOW SO THAT THE RESULTANT VOLVAGE DROP ACROSS THE CELL IS AT LEAST SUBSTANTIALLY AS GREAT AS SAID FIRST NAMED VOLTAGE DROP, THE TEMPERATURE OF THE LITHIUM-MODIFIED ELECTROLYTE BEING ABOVE ABOUT 845*C.

Claim 2

THE METHOD OF INCREASING THE OUTPUT OF AN ELECTROLYTIC ALUMINUM REDUCTION CELL, WHICH CELL COMPRISES A CARBON ANODE, A MOLTEN ALUMINUM CATHODE AND A MOLTEN SALT ELECROLYTE CONSISTING ESSENTIALLY OF CRYOLITE AND ALUMINA, AND IN THE OPERATION OF W HICH CURRENT IS PASSED FROM SAID ANODE THROUGH SAID ELECTROLYTES TO SAID CATHODE WITH A GIVEN VOLTAGE DROP ACROSS THE CELL, WHICH METHOD COMPRISES INCORPORATING LITHIUM-CONTAINING MATERIAL IN SAID ELECTROLYTE IN AN AMOUNT TO PROVIDE IN SAID ELECTRO LYTE A LITHIUM CONTENT EQUAL TO THAT RESULTING FROM AN ADDITION OF LITHIUM FLUORIDE IN AN AMOUNT FROM ABOUT 2 TO 20 PERCENT BY WEIGHT OF THE ELECTROLYTE, AND ESTABLISHING A CURRENT FLOW SO THAT THE RESULTANT VOLVAGE DROP ACROSS THE CELL IS AT LEAST SUBSTANTIALLY AS GREAT AS SAID FIRST NAMED VOLTAGE DROP, THE TEMPERATURE OF THE LITHIUM-MODIFIED ELECTROLYTE BEING ABOVE ABOUT 845*C.