The powdered materials stored in the raw material silo (such as limestone, dolomite, coal gangue, magnesium carbonate, aluminium hydroxide, etc.) are conveyed and measured by the screw conveyor at the bottom of the silo and the screw metering scale, and then fed into the secondary cyclone preheater (commonly known as the Venturi dryer) by the feeding screw conveyor for initial preheating. The initially preheated materials are carried into the first-stage cyclone separator of the suspension furnace along with the hot gas flowing through the air duct. The mixed gas undergoes gas-solid separation in the first-stage cyclone preheater. The separated solid materials are then blown away by the hot gas (with a gas temperature of approximately 500 to 950℃) coming out of the third-stage cyclone preheater of the suspension furnace and come into full contact with the hot air for further preheating. Then it enters the second-stage cyclone preheater of the suspension furnace with the hot gas flow for gas-solid separation. The hot air coming out of the first-stage cyclone preheater of the suspension furnace enters the subsequent flue gas treatment system for desulfurization, dust removal and denitrification treatment before being discharged. The materials are discharged from the three-stage cyclone preheater and sent to the five-stage suspension furnace for calcination. After five stages of preheating, calcination and three stages of cooling, the products are sent to the finished product storage by the bucket elevator.