Chemistry: electrical and wave energy – Processes and products
Patent
1979-02-01
1980-01-01
Williams, Howard S.
Chemistry: electrical and wave energy
Processes and products
204 64R, 204 64T, 204 65, 204 68, 204 70, 204243R, C25C 306, C25C 316, C25C 326, C25C 334
Patent
active
041815840
ABSTRACT:
A method is described for heating an electrolytic cell used for the production of metal, e.g., aluminum, by electrolysis of a molten electrolyte which contains solid electrolyte between adjacent surfaces of the anode and cathode of the cell. In the described method, holes are drilled in the solid electrolyte, e.g., to the floor of the cell, to provide space for supporting blocks. The holes are spaced a predetermined distance apart to position at least one anode between them. Supporting blocks with a length sufficient to extend from the floor to at least the level of the solid electrolyte beneath the anode are placed in the holes and a resistance heater, preferably one having a positive change in resistivity with temperature, is disposed between the supporting blocks at least one of which is electrically conductive. The anode of the cell is lowered into electrical contact with the resistance heater and current sufficient to heat the resistance heater to at least the melting temperature of the electrolyte, is passed from the anode through the resistance heater. Heating of the resistance heater is continued until the solid electrolyte in the cell has melted. Thereafter, the anode is raised out of electrical contact with the resistance heater, the heater and supporting blocks are removed and the anode is lowered to its normal position for electrolysis.
REFERENCES:
patent: 3960696 (1976-01-01), Wittner
patent: 4045307 (1977-08-01), Turley
patent: 4071420 (1978-01-01), Foster et al.
Holden Calvin B.
Steiger Roger A.
PPG Industries Inc.
Stein Irwin M.
Williams Howard S.
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