To obtain a desired product on calcinating waste materials by keeping the temperature in an oven properly.
When the waste materials 2 are burned in a treating oven 3, oxygen is fed by an oxygen pump (an oxygen-feeding means) 7 to the wasted materials from the lower part of the treating oven 3, and a radio wave is irradiated from a radio wave-generator (an energy-supplementing means) 4 to the waste materials from the upper part of the treating oven 3. The temperature in the oven is measured by a temperature sensor 5, and the amount of oxygen supply and the amount of the radio wave irradiation are regulated so as to keep an objective temperature. It is possible to know whether the waste materials become the desired state or not by measuring the specific resistance of the waste materials by a specific resistance sensor 6, and therefore, e.g. it is possible to obtain pyroligneous acid liquid by cooling smoke collected from a gas-collecting tube 12 in a state of having a properly regulated temperature.
SUGIYAMA KAZUO
MATSUI MASAYUKI
UNIV SAITAMA
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