METHOD FOR RECOVERING IMPURITY ELEMENT IN SCRAP

PURPOSE:To efficiently recover impurity element by bringing scrap containing the impurity element of an available metal, etc., having low b.p. and high vaporability into contact with molten metal having large heat capacity such as molten steel, and recovering the vaporized gas in the oxygen-containing atmosphere. CONSTITUTION:Scrap and the molten metal are brought into contact at a suitable position out of a refining furnace, such as a ladle or torpedo car for charging into a converter, or a converter. For example, after charging the scrap into the converter 10, the molten iron is charged from the ladle, etc. The suction quantity in a main gas exhaust side dust collector connected with a duct 18 can be reduced while the suction quantity in a ventilating dust collector side is increased and changeover dampers 16, 17 are made to be closing and opening conditions, respectively to execute the suction. The scrap in the converter 10 is brought into contact with the molten iron and the temp. is rapidly risen, and the impurity element of Zn, etc., in the scrap becomes the vapor. This vapor comes out of the converter 10 and is sucked into a duct 13 from the ventilating dust collecting hood 12, and Zn is reacted with oxygen in the air sucked at this time to make the stable crystal of ZnO, and ZnO is sucked and recovered into a dust collector 15 for recovering the initial stage dust separated with the ordinary dust collecting chamber 14.