NOVELTY - A waste material is partially oxidized. Generated combustible gas is cooled to a temperature lesser than the melting point of the salt in the gas, and cleaned to remove the salt. Dust from the combustible gas is removed. The combustible gas is burnt and cooled by mixing a gas of temperature lesser than the melting point of the salt in the combustible gas and thus the waste material is processed.    USE - For processing of waste material such as industrial waste and municipal solid waste for generation of electric power.    ADVANTAGE - The method enables efficient and economical processing of waste material and generation of electric power. Clogging of filter by salt, and corrosion of heat exchanger tube by the salt are prevented.    DETAILED DESCRIPTION - A waste material is subjected to incomplete combustion or partially oxidized in a partial oxidation furnace (1). The generated combustible gas is cooled to a temperature lesser than the melting point of the salt in the gas, and cleaned by a dust removal apparatus (2) to remove the salt. Dust from the combustible gas is removed. The combustible gas is burnt in the combustion furnace (3) and cooled by mixing a gas of temperature lesser than the melting point of the salt in the combustible gas and thus the waste material is processed. An INDEPENDENT CLAIM is included for processing apparatus of waste material, which has cooling unit for cooling combustible gas, partial oxidation furnace, dust removal apparatus installed in later flow of partial oxidation furnace, combustion furnace, supply unit (5) for supplying gas of temperature lesser than melting point of the salt in the combustible gas at variable feed rate, temperature detection unit (2B) for detecting temperature of the combustible gas before removal of dust and control unit (6) for controlling feed rate in the supply unit such that detector temperature is lesser than the melting point of the salt.    DESCRIPTION OF DRAWING(S) - The figure shows the outline structure of the processing apparatus of waste material. (Drawing includes non-English language text).    partial-oxidation furnace (1)    combustible gas supply path (1A)    dust removal apparatus (2)    temperature detection unit (2B)    combustion furnace (3)    boiler (4)    supply unit (5)    control unit (6)