Process for the wet treatment of spent pot linings from hall-her

Details Process for the wet treatment of spent pot linings from hall-her Process for the wet treatment of spent pot linings from hall-her

1991-11-18

1993-09-14

Straub, Gary P.

Hazardous or toxic waste destruction or containment

Containment

423111, 423127, 423131, 423185, 423DIG20, 204 67, A62D 300, C01F 700, C25C 306

Patent

active

052451160

ABSTRACT:
A process for the treatment of spent pot linings impregnated with alkali metal cyanide and fluoric products by grinding previously crushed pot linings in the presence of lime, suspending the ground pot linings in an aqueous medium in order to precipitate a flux in the form of CaF.sub.2 accompanied by the release of soda, followed by the heating of the suspension at a temperature T>140.degree. C. in the presence of clay to form, after fixing the free soda, insoluble synthetic silicate compounds of the feldspathoid or zeolite type and finally the separation by filtration of the resulting solid phase from the liquid phase, which liquid phase is recycled to form a new ground pot lining suspension.

REFERENCES:
patent: 4113831 (1978-09-01), Orth, Jr. et al.
patent: 4113832 (1978-09-01), Bell et al.
patent: 4447740 (1984-04-01), Snodgrass
patent: 4576651 (1986-03-01), Peutschman
patent: 4816122 (1989-03-01), Lever
patent: 4889695 (1989-12-01), Bush

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