NOVELTY - The temperature of interior of furnace chamber (4) is raised by reaction heat of inorganic particle supplied to furnace, and combustion heat of burner (5a,5b). To-be-processed material is heated, vaporized and thermally decomposed in chamber (4). The gas produced by decomposition is cooled and filtered, and ejected to exterior of chamber (4). Melt produced in chamber (4) is recovered, and high temperature processing is enabled.    USE - For high temperature processing of to-be-processed waste material such as polychlorinated biphenyl, dioxin and medical waste.    ADVANTAGE - The to-be-processed waste materials are efficiently and economically processed at high temperature.    DETAILED DESCRIPTION - The temperature of interior of furnace chamber surrounded by heat-resistant internal insulation is raised by reaction heat of inorganic substance fine particle supplied to furnace interior, and combustion heat of heating burner. To-be-processed material is heated and vaporized. The vaporized material is supplied to interior of furnace chamber, and thermally decomposed. The gas produced by decomposition is cooled and filtered, and ejected to exterior of furnace chamber. The melt produced in furnace chamber interior is then recovered. Thus, high temperature processing of to-be-processed material is enabled. An INDEPENDENT CLAIM is included for high temperature processing apparatus. The apparatus has furnace chamber, heating burner, fine particle injection path (19) for supplying inorganic substance fine particle to furnace chamber interior, air supply path (16) for supplying air to furnace chamber, heat supply path (3), exhaust gas processing unit and recovery unit. The heating supply path carries out heating vaporization of to-be-processed material. The exhaust gas processing unit cools and filters the gas produced in furnace chamber, and ejects the processed gas to exterior of furnace chamber. The recovery unit recovers the melt produced in interior of furnace chamber.    DESCRIPTION OF DRAWING(S) - The figure shows a vertical sectional view of high temperature processing apparatus.    storage tank (1)    heat supply path (3)    furnace chamber (4)    heating burners (5a,5b)    cooler (6)    furnace wall (8)    air supply path (16)    fine particle injection path (19)    cooling device (21)    filter apparatus (22)