Coal spiral separator is the common coarse coal slime processing equipment that using in the coal preparation plant, especially suitable for thermal coal preparation plant that the coarse coal slime separation between 2 ~ 0.1 mm. Coal spiral separator is the equipment that base on the different of material density which could be separating the clean coal and waste rock of coal preparation. After the coarse coal slime enters the spiral separator, due to the function of gravity,centrifugal force ,friction force and the role of water flow pressure for the light and heavy particles, the materials of different particles and density that have different trajectories in the spiral separator, eventually the waste rock expel from the spiral groove inner edge, and the clean coal expel from the spiral groove outer edge, the clean coal and waste rock finished separation.