PURPOSE: To enable continuous operation, to increase the rate of recovery of spherical body, and to reduce the wearing loss of the inside wall of the melting furnace remarkably in a vertical melting furnace having a melting zone and a cooling zone by providing an inlet of shielding gas to the position where the temp. of the surface of the inside wall is near the melting point of the raw material.
CONSTITUTION: In a vertical melting furnace comprising a melting zone A and a cooling zone B, an inlet 2 of shielding gas is provided to the position where the temp. of the surface of the inside wall is near the melting point of the raw material in such a manner that a curtain of voltex gas stream is formed. By the effect of the gaseous curtain, the spherical bodies of the molten inorg. material can not approach the furnace wall, but are driven back on the contrary toward the furnace core, or spherical bodies near the surface of the inside wall are blown away. Therefore, wearing loss of the inside wall of the furnace or sticking of spherical body to the wall surface, and accumulation succeeding the sticking are prevented. As the result, continuous operation of the furnace has become possible, and the rate of recovery of the spherical body is increased, and the wearing loss of the inside wall is reduced.
KOBAYASHI AKIRA
KINUMATSU SHIGEKI
