PURPOSE: To prevent accumulation of suspended powder such as inorg. spherial body deposited and melted on the inside wall surface of a melting furnace in in the preparation of inorg. spherical body by feeding a raw materials comprising the inorg. powder and fuel gas to a melting furnace, by feeding shielding gas along the inside wall surface of the melting furnace.
CONSTITUTION: In the prepn. of inorg. spherical body by feeding a raw material comprising inorg. powder such s silica stone having ≤500μ max. particle size and pref. 1W10μ average particle size, and fuel gas comprising usually combustible gas and O2-contg. gas to a melting furnace, shielding gas such as air is fed along the inside wall surface of the melting furnace. Preferred flow rate of the O2-contg. gas is ≥1.5/sec, and preferred flow rate of the shielding gas is ≥3m/ sec. As the result, the raw material comprising inorg. material and/or suspended matters comprising inorg. spherical body is (are) prevented from accumulation on the inside wall surface of the melting furnace by sticking and melting. Continuous operation of the furnace is possible, wear of the inside wall is reduced and rate of recovery of the material is increased.
KOBAYASHI AKIRA
KINUMATSU SHIGEKI
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