PROBLEM TO BE SOLVED: To provide an atomization thermal decomposition treatment apparatus capable of achieving the enlargement thereof, the increase in the quality of a product and the mass production of a product.SOLUTION: Provided is an atomization thermal decomposition treatment apparatus 1 comprising: an atomizer 9 of atomizing raw material droplets; a cylindrical reaction furnace 3 of heating the raw material droplets atomized from the atomizer 9 in a high temperature atmosphere so as to be decomposed; and a blast part 7 of passing a hot blast through the outer circumference 3a of the reaction furnace 3 from the lower side in the vertical direction of the reaction furnace 3 toward the upper side thereof. The reaction furnace 3 is made of metal, the hot blast passing through the blast part 7 is applied to the reaction furnace 3, and the raw material droplets are heated and decomposed in the reaction furnace 3.
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