This paper describes a new cooling method suitable for molten slag from the ash vitrification process using an electric-resistance furnace. The system consists of twin drum type copper rolls cooled indirectly by coolant flowing inside. Slag is poured between the turning twin rolls and solidified. Experience from the test plant showed melting slag forming into harmless, hard flakes. The cooling process is examined by calculation and the amount of heat recovery from the heat of the slag is estimated. The result shows that this method solves the conventional problems of space and water treatment and saves melting energy.
