| 摘要 |
A method for the treatment of spent potlining from aluminium reduction cells including refractory material in order to transform the spent potlining to a condition in which it can be used as a filler or as a raw materia. The spent potlining is crushed and supplied to a closed electrothermic smelting furnace, optionally together with a SiO2 source, in which the spent potlining is melted at a temperature between 1300 and 1750 DEG C. An oxidation agent is supplied to the furnace in order to oxidise carbon and other oxidisable components contained in the spent potlining such as metals, carbides and nitrides. A source of calcium oxide is also supplied to the smelting furnace in an amount necessary to react with all fluoride present to form CaF2, which slag is liquid at the bath temperature in the furnace. The calcium aluminate or calcium aluminate silicate slag and optionally a metal phase are tapped from the furnace and cooled to blocks or granules. |
