The present invention powder particles together with a can efficiently heat treatment even at a low temperature and one of the temperature of the high temperature, the heat treatment method of heat treatment equipment and waste plaster of suppression possible with the powder particles the occurrence of condensation to control the exhaust gas temperature I will provide a.
A features a high-temperature heat treatment kiln 3 and the low-temperature heat treatment kiln 2, provided with a gas supply duct 4 for supplying the exhaust gas that is derived from the high-temperature heat treatment kiln 3 to the low-temperature heat treatment kiln 2, the low-temperature heating the discharge destination of the particulate material to be discharged from the processing kiln 2 to one of the low-temperature powder or granular material storage bin or high-temperature heat treatment kiln 3 equipped with a switchable screw conveyor 30. In addition, the kiln in which the number of revolutions of the low-temperature heat treatment kiln 2 of the kiln body 16 as a variable-speed, adjusting the rotational speed of the kiln body 16 on the basis of the low-temperature kiln exhaust gas temperature value detected at a low temperature kiln exhaust gas temperature sensor 49 It comprises a rotational speed controller 51.
.FIELD 1