Molten metal purification device

A molten metal purification device for purifying molten metal flowing through a molten metal flow body in which a flow path through which molten metal to be purified flows is formed by a pair of side walls opposed to each other in a width direction and a bottom wall connecting the side walls, wherein

• the molten metal purification device comprises an internal member provided inside the molten metal flow body, and an external member provided outside the molten metal flow body,
• the internal member includes:
• a non-conductive filter that is provided inside the flow path;
• and
• an electrode body provided inside the flow path, the electrode body being made of a conductive member having an electric resistance value larger than an electric resistance value of molten metal to be purified, the electrode body having a pair of electrodes facing each other in a width direction of the molten metal flow body and a bottom wall connecting the electrodes, the electrode body being configured such that current flows across the pair of electrodes through the molten metal to be purified, and
• the external member is configured as a magnetic field device having an upper surface side magnetized to an N pole or an S pole, and is disposed entirely below the molten metal flow body so that lines of magnetic force coming out from the N pole or lines of magnetic force entering the S pole intersect with current flowing across the pair of electrodes to generate Lorentz force for driving the molten metal to be purified passing through the filter in a direction along a flowing direction in the flow path.