Fine particle coal gas solid fluidized spiral sorting method and sorting machine

The invention belongs to the technical field of fine coal dry separation, and solves the problems of difficult density control and complex process of fine coal dry separation on the premise of ensuring the separation precision. According to the fine particle coal gas solid fluidized spiral sorting method and sorting machine, compressed air carries materials to be sorted to enter a spiral airflow sorting groove, and particles of the materials to be sorted move forwards along a sorting chamber under the action of airflow; the to-be-sorted materials are vertically layered under the effects of feeding air supply, groove bottom air supply, vertical vibration of the spiral airflow sorting groove and self gravity; meanwhile, due to the fact that radial circulation generated by uniform fluidization of the heavy particles in the bed layer can promote light particles of the to-be-selected materials on the upper layer to move towards the outer edge in the radial direction and heavy particles of the to-be-selected materi