Coal gangue roasting activation device and use method thereof

The invention discloses a coal gangue roasting and activating device, and relates to the technical field of mineral processing, the coal gangue roasting and activating device mainly comprises a roasting main furnace, a drying mixer, a staying tank and a cyclone cooler, an outlet of the roasting main furnace is communicated with the drying mixer through a second-stage high-temperature separator, and an outlet of the drying mixer is communicated with a first-stage preheating separator; a flue gas outlet of the first-stage preheating separator is communicated with a flue gas treatment system, a discharge port of the first-stage preheating separator is communicated with a roasting main furnace, and the roasting main furnace is used for roasting a coal gangue raw material so as to perform kaolinite crystallization conversion; the second-stage high-temperature separator is communicated with the staying tank, so that the roasted sand enters the staying tank to complete crystal form transformation; a discharge port o