Process for the treatment of spent potlinings from Hall-Heroult electrolytic cells by thermal shock.

摘要

Process for the treatment of spent ground pot-linings by thermal shock in a reactor, the linings consisting at the same time of carbon-containing products and of silicoalumina products impregnated with inorganic fluorine compounds, as a mixture with a pulverulent mineral additive capable of combining when heated, with or without melting, with the impregnating fluorine compounds to form new stable and insoluble compounds such as CaF2, and binary, ternary or quaternary compounds of NaF, CaF2, SiO2, Al2O3, CaSO4, Na2SO4 of the nepheline, haüyne or other type. …IMAGE…