Has a heater 180 to allow warm the molten metal has a first furnace wall 120 , and the molten metal heat insulation device 100 capable of housing the crucible 110 so that the opening side outer wall surface of the crucible 110 is exposed by a predetermined amount, a second furnace wall 210, the pressed state of the opening-side outer wall surface of the crucible 110 in the mounted state in the melt thermal insulation device 100, the inner wall surface of the second furnace wall 210 along the outer periphery of the opening-side outer wall surface in a crucible fixing ring 200 to fix the crucible 110 by supporting, it has a third furnace wall 310, slightly larger or equal to the outer diameter of the opening side upper end portion of the inner diameter of the crucible 110 of the third furnace wall 310 the auxiliary ring 300 having an inner diameter, surrounded by the space in the fourth furnace wall 400 and having a fourth furnace wall 400, a combustion apparatus having a burner 440 for dissolving the molten metal in the crucible 110 over direct heat 400 It includes a. This allows improved and high service life of maintainability, and can be improved and the melt productivity of dissolution efficiency.
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