Abstract: A method of melting an incineration residue includes steps of: charging an incineration residue containing salts into a melting furnace; heating the charged incineration residue in the melting furnace to produce a melt which includes a molten slag layer and a molten salt layer on the molten slag layer; controlling a temperature of the molten salt in the molten salt layer; discharging the molten slag from the melting furnace; and discharging the molten salt from the melting furnace.

Abstract: A reduction cell pot used in the production of aluminum by fused salt electrolysis comprising an outer steel shell, a thermally insulating layer and an inner lining comprised essentially of carbon.At least the lower 80% of the floor insulation, preferably at least the lower 90%, comprises a layer of volcanic ash which has been compacted by mechanical means. The rest of the floor insulation consists of a leakage barrier which protects the volcanic ash from bath components which penetrate the carbon lining.

Abstract: Raw magnesium is charged into a precipitation chamber in a refining furnace beneath the metal surface as a stream directed toward a salt layer beneath the metal. The resultant precipitated sludge is directed along a sloped bottom in the chamber to an adjacent accumulating chamber. Magnesium rises in the precipitation chamber and passes through openings in partition walls between adjacent precipitation chambers. The purest magnesium from an upper metal layer in one chamber is expelled to a lower level in next chamber in the process direction. The refining furnace comprises an accumulating chamber for sludge and plurality of successively arranged precipitation chambers divided from each other by vertical walls. The openings in the partition walls between adjacent precipitation chambers are designed as skewed channels with an inlet at a higher level than an outlet in the following chamber.

Abstract: An electric installation for heating molten metals and/or salts, as well as for heating solutions with direct heating of the baths by means of resistance heating elements partly dipped in the bath being heated.The heat necessary for heating the charge is generated in a heating element partly immersed in the bath being heated, in contact materials being in contact with the heating elements as well as in the bath being heated. Electric potential difference is applied by the electrodes and current supply means to the contact materials in contact with a first surface of the heating element and to the bath being heated which is in contact with a second surface of the heating element, the contact materials being included in the electric circuit of the heating element.