METHOD OF RECYCLING METALLIC COATED SCRAP PIECES

摘要

The invention relates to a method of recycling metallic coated scrap pieces of which the liquidus temperature of the coating layer is lower than the solidu s temperature of the core layer, such as brazing sheet scrap pieces, or metall ic coated scrap pieces of which the upper part of the melting range of the coating layer has an overlap with the lower part of the melting range of the core layer, by at least partially removing the coating layer from the core layer of said scrap pieces making use of a heat resistant metallurgical vess el having an opening for introducing the scrap pieces into the vessel and exit means for discharging essentially molten alloy, the vessel being rotatable around an axis of rotation, the method comprising the sequential steps of : - filling the vesssel with a load of scrap pieces ; - supplying an amount of energy to the vessel such that essentially all the scrap pieces reach a temperature above the solidus temperature of the coating layer ;- rotating t he vessel during and/or after the supplying of the amount of energy for forming essentially molten alloy ; - removing the essentially molten alloy, having t he composition of the coating layer of the scrap pieces mixed with small amount s fo the core layer, through the exit means of the vessel ; - removing the remainderof the load from the vessel.