Novel device and process used in dry process sintering section in alumina production

The invention discloses a novel device and process used in a dry process sintering section in the alumina production and relates to the technical field of alumina. The novel process comprises the following steps: feeding ground raw materials into a cyclone preheater for preheating; conveying the preheated raw materials into a rotary kiln, converting calcium carbonate, sodium carbonate, aluminum oxide, ferric oxide and silicon dioxide in the raw materials into sodium aluminate, sodium ferrite and calcium orthosilicate, and sintering to obtain a product clinker; and feeding the product clinker into a grate cooler for cooling, and crushing the product clinker through roller crushing. High-temperature tail gas of the rotary kiln is fully utilized to preheat raw materials through the large-dip-angle cyclone preheater, energy consumption in the sintering process is greatly reduced, and meanwhile the material blocking risk is reduced; and the grate cooler with a roller crusher can achieve the best cooling effect and