Patent ID: 6139704
Filing Date: 2000-10-31
Classification: C04B,C25C

Abstract:
A drained-cathode cell for the production of aluminium by the electrolysis of alumina dissolved in a molten electrolyte, the cell comprising at least one drained cathode and a facing anode spaced apart from the cathode in the electrolyte by an anode-cathode gap, said drained cathode having a drained cathode surface on which during operation aluminium is cathodically produced and from which the produced aluminium constantly drains, the drained cathode being formed by a body coated with an adherent aluminium-wettable coating of per formed refractory hard metal boride in a dried colloid, said coating being obtainable by non-reactive sintering or consolidation of the preformed particulate refractory hard metal boride in the dried colloid.