Method in the electrolytical production of aluminum

Claim 1

IN THE DIRECTION OF METALLIC ALUMINUM BY ELECTROLYTIC REDUCTION OF ALUMINUM IN A BATH OF FUSED ELECTROLYTE CONTAINING FLUORIDES WHICH IS ACCOMPANIED BY THE GIVING OFF OF LARGE AMONNTS OF CARBON-OXYGEN GASES, AND IN WHICH THE FLUORIDE PROPORTION AND THE QUANTITY OF THE SAID ELECTROLYTE IS PERIODICALLY READJUSTED BY ADDING FLUORIDES TO THE ELECTROYLTE IN A FINELY DIVIDED FORM SUCH THAT IT WOULD BE CARRIED OFF BY THE CARBON-OXYGEN GASES UNLESS PRECAUTIONS WERE TAKEN TO PREVENT IT, THAT IMPROVEMENT IN THE STEP OF ADDING THE FLUORIDES COMPRISING ENCLOSING A QUANTITY OF FLUORIDE DUST IN SAID SUFFICIENTLY FINELY DIVIDED FORM IN AN ALUMINUM CONTAINER, AND FORCING THE ALUMINUM CONTAINER WITH THE FLUORIDE POWDER THEREIN UNDERNEATH THE CRUST ON THE TOP OF THE BATH DIRECTLY INTO THE ELECTROLYTE, WHEREBY THE FINELY DIVIDED FLUORIDE DUST IS PREVENTED FROM BECOMING ENTRAINED IN THE GASES GIVEN OFF.