Process for the heat treatment of spent pot linings derived from

Details Process for the heat treatment of spent pot linings derived from Process for the heat treatment of spent pot linings derived from

1993-06-25

1994-11-15

Lewis, Michael

Hazardous or toxic waste destruction or containment

Containment

423111, 423659, 423130, 588900, B09B 300, A62D 300, C01F 100

Patent

active

053650123

ABSTRACT:
A process for heat treating spent pot linings from Hall-Heroult electrolytic cells which comprise carbon and silico-aluminous materials impregnated with fluorides. The pot linings are ground to a particle size less than 5 mm, and formed into an intimate mixture with calcium sulfate or calcium sulfate dihydrate having a particle size less than 1 mm. The mixture is injected into the center of a vortex formed by a flow of circulating hot gas at the top part of a reactor at a temperature between 700.degree. and 1100.degree. C., and extracted from the bottom part of the reaction at a temperature between 400.degree. and 750.degree. C. after a contact time of less than 2 seconds.

REFERENCES:
patent: 5245115 (1993-09-01), Barrillon et al.

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