Magnetic separation of inclusions in molten metal using a high magnetic field

A new method for separating inclusions from molten metal using a high magne tic field has been proposed. The principle of this method based on a magnet ization force has been confirmed in experiments with Al-Si-Mn-Fe, Bi-Mn and AI-Si alloys, in which precipitated particles of intermetallic compounds a nd silicon imitating inclusions in molten metal were separated. In order to measure magnetic susceptibility, the Gouy's method has been mod ified by using a super conducting magnet to work in a high temperature up t o 1200 degrees C. The theoretical expression of the magnetization force whi ch is indispensable to evaluate the magnetic susceptibility has been derive d. By use of the expression, the magnetic susceptibility of the intermetall ic compounds used in the experiment of magnetic separation was measured ove r the range of liquidous to solidous temperatures.