Coal slime itself with high humidity, high adhesive sex, in drying of the coal slime wet by belt conveyor equipment, through scattered into the coal slime into clumps break fast a negative pressure dryer after the following points: One is the working area material area, wet coal from the area and high temperature hot air negative pressure after being contacted evaporated quickly out a lot of water in large coal slurry, the Angle of the copy, copy plate moving XingBuCheng bond and was introduced into the next working area; 2 it is clear area, in this area is wet coal slime copy plate start to copy form curtain material, material fell to the state to binding phenomenon of wall, formed in the drum of the equipment to design a area cleaning device, cleaning device can quickly cleared off the slurry inner bond, in the process, cleaning device for materials group also to play ball agglomerate crushing effect, thus increasing the heat transfer area, improve the heat and qualitative efficiency, improve drying rate; Three is tilted stripper plate area, the young area is dry at low temperature area, in this area have a slime low moisture, this area has loose state has no binding phenomenon, through after heat exchange finished product to reach the required water requirements, the final movement of the material area; Four is the material area, dry in this area is not host drum set copy plate, material within this region rolling taxi to finish the whole mouth discharging drying process.