METAL REMOVAL AGENT

The purpose of the present invention is to provide a metal remover used when removing Mg from an aluminum alloy melt that is a waste material or the like as a starting material. The present invention provides a metal remover for forming a molten salt layer that absorbs Mg from an aluminum alloy melt. The metal remover contains: a specific metal element that is at least one of Cu, Zn, or Mn; a specific halogen element which is one or more of Cl or Br; and Mg. The metal remover may further contain: a base halide serving as a base material for the molten salt layer; and a specific metal halide which is a compound of a specific metal element and a specific halogen element. The specific metal element is one or more of Cu, Zn, or Mn, and the specific halogen element is one or more of Cl or Br. When a molten salt layer formed using the metal remover and an aluminum alloy melt containing Mg are in contact with each other, Mg is absorbed from the aluminum alloy melt side to the molten salt layer side and effectively r