The rotary drying machine has been mainly used for drying materials with some humidity and granularity in the fields, such as ore dressing, building materials, metallurgy, chemical industry, etc. The rotary drying machine is highly adaptable to materials. Due to its easy and reliable operation, it is widely used. The proper design of a rotary dryer is based upon several key factors. The limestone dryer diameter determines the gas velocity. Lifter design determines how the material will fall through the gas stream.

When designed correctly, the full width of the dryer becomes a shower of material. When the materials in cement powder system contain much water and own big cohesiveness, and it is difficult to deal with it by way of drying and powder processing, and we can prebake the materials or part of materials in limestone dryer machine, then send them into the system of drying and powder. The process is good for the process of wet and viscous materials, at the same time,drying equipment can reduce the power consumption of drying high water-contained materials. but the process is complicated, and the prebaked materials need to middle storage.The limestone dryers are manufactured using best quality raw material.

The rotary dryer is also called drum dryer or rotary drying machine which is composed by a cylinder-shaped structure. This cylinder is put in a horizontal way and one end is relatively higher than the other. When the rotary drum dryer works, the wet materials are sent to the material adding cabin by the belt conveyor or the bucket elevator, and the materials go inside the dryer machine from the upper end, and the limestone dryer will constantly rotate, the materials inside the cylinder will be brought to a higher part with the rotation of the machine and then fall down. There is lifting board on the internal wall of the cylinder which is used for making the materials evenly fall down after they are brought a higher part, thus increasing the touching area of the materials with the air. Some dryers has hot air going through from one end in order to dry the materials faster.

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