The working principle of the rotary dryer is mainly based on the physical properties of the material. The moisture in the wet material is separated by heating and evaporation to achieve the purpose of drying. In the process of drying silica sand, the rotary dryer uses a hot air circulation system to send hot air into the rotating cylinder, which is fully in contact with the silica sand to evaporate the moisture in the silica sand. As the rotating cylinder rotates continuously, the silica sand is constantly turned and moved in the cylinder, ensuring full contact and uniform drying of the silica sand and hot air.

 

 

• Rotating cylinder: The rotating cylinder is the core part of the rotary dryer. It is made of stainless steel and is equipped with a heating system and a hot air circulation system. The rotation of the cylinder causes the silica sand to be constantly turned and moved in the cylinder to achieve uniform drying.

 

• Feeding device: The feeding device is used to feed wet silica sand into the rotating cylinder, usually using equipment such as a screw conveyor.

 

• Heating system: The heating system provides heat energy for the rotary dryer, usually using fuel oil, gas, steam or electricity as a heat source. The heating system increases the air temperature in the cylinder and provides the necessary heat for the drying of silica sand.

 

• Discharging device: The discharging device is used to discharge the dried silica sand from the rotating cylinder, usually using equipment such as a belt conveyor or a screw conveyor.

 

• Hot air circulation system: The hot air circulation system is a key part of achieving silica sand drying. It uses a fan to send hot air into the rotating cylinder. After fully contacting the silica sand, the air containing water vapor is discharged and recycled after treatment.

 

 

• Inlet air temperature: The inlet air temperature is one of the key parameters of the drying process, which affects the drying speed and product quality. Usually, the inlet air temperature needs to be adjusted according to the humidity and drying requirements of the silica sand.

 

• Outlet air temperature: The outlet air temperature reflects the end of the drying process and the quality of the product. Too low outlet temperature may cause the silica sand to have too high moisture content, while too high temperature may cause equipment damage. Therefore, it is necessary to select the appropriate outlet temperature according to the humidity and drying requirements of the silica sand.

 

• Operating pressure: The operating pressure affects the drying efficiency and product quality. Under positive pressure operation, the dust volume is large and the operating environment is harsh; while under negative pressure operation, the entire system is kept under negative pressure conditions, which can effectively prevent dust from flying and product deterioration. Therefore, the appropriate operating pressure should be selected according to the actual situation.

 

• Feeding speed: The feeding speed is one of the important factors affecting the drying efficiency and product quality. Too fast feeding speed may cause material bridging, while too slow feeding speed may affect production efficiency. Therefore, the appropriate feeding speed should be selected according to the actual situation.

 

The rotary dryer used for drying silica sand has the advantages of high efficiency, reliability, and uniform drying, and is particularly suitable for the drying treatment of materials such as silica sand. In actual operation, it is necessary to select appropriate operating parameters according to factors such as the humidity of silica sand, drying requirements, and equipment performance to ensure the drying effect and product quality. At the same time, regular maintenance and maintenance of the equipment is also an important measure to ensure the normal operation of the equipment and extend its service life.