Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1978-06-28
1979-07-10
Edmundson, F. C.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204 67, C25C 308, C25C 306
Patent
active
041607155
ABSTRACT:
An improved lining for an electrolytic furnace for producing aluminum is disclosed having sufficient thickness that heat flow therethrough is such that an insulative coating provided on the inside surface of a perimetric metal shell around the electrolytic furnace is not exposed to temperatures above an upper temperature limit at which the coating is impenetrable by molten salt. Such improved lining includes an inner layer of high-fired refractory, penetrable by the molten salt and resistant to chemical corrosion by such penetration. The inner layer is of sufficient thickness that a salt freeze line is located therein. Within the inner layer and outside the freeze line is a layer of material impenetrable by molten aluminum. In at least the bottom portion of the furnace and outside the inner layer is at least one layer of glass refractory impermeable to the molten salt.
REFERENCES:
patent: 3856650 (1974-12-01), Kugler et al.
patent: 3960696 (1976-06-01), Wittner
patent: 4093524 (1978-06-01), Payne
patent: 4118304 (1978-10-01), Arita
Allen William R.
Kinosz Donald L.
Aluminum Company of America
Edmundson F. C.
Hill David J.
Valentine D. R.
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