Sand blocking in rotary sand dryer is a commonly-seen problem. It may be caused by the disorderly working. Since sand dryer machine is designed with definite specification and model, it is available for materials with certain amount and size. When the amount or size of raw material is larger than the rated value, sand blocking would occur. In addition, sand blocking may be caused by the misoperation. For example, if operators have no clear minds toward the water amount, the drying effect would be directly influenced and the chance to have sand blocking would be much higher.

How to deal the sand blocking? Firstly, we can shift down the baiting hopper to improve the operational availability of sand dryer machine, save energy cost and raise the thermal efficiency. Secondly, we can equip the feeding system with speed-regulating belt to control the feeding amount. Only so, the heat exchange between raw material and hot air can be more sufficient. Thirdly, we can install waste heat collecting system in sand rotary dryer. Since the heat energy can not be fully taken into use, this system is necessary to exist. At last, we can widen the gap between sliding drum and wall. Only in this way, the falling space of raw material would become larger for the fear of blocking in machine.

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