Method and apparatus for purification of metal

摘要

Problem to be solved: to provide a method capable of efficiently removing Zn from Al based molten metal using scrap or the like as raw material.The present invention is a metal purifying method for purifying an aluminum based molten metal by removing a specific element contained in an aluminum base melt by a vacuum distillation method.The present invention is provided with a local heating step for heating the vicinity of the surface of the molten aluminum base melt.The local heating step is performed, for example, by arc discharge, laser irradiation, and electron beam irradiation.At this time, it is preferable that the air is applied to the surface of the molten aluminum substrate.The specific element may be one or more of Zn, Mg or Pb having a higher saturated vapor pressure than al.According to the present invention, it is possible to efficiently remove specific elements from the Al based molten metal in a short time without increasing the melting temperature or the degree of vacuum.Diagram