Pneumatic conveying is to use the compressed air in the pipeline to realize continuous conveying of materials according to the set route. It is generally composed of gas power source, feeding device, conveying pipeline and separation device. it has the following advantages: 1. The device has the advantages of simple structure, not easy loss, less investment cost in the early stage, simple operation and less maintenance cost in the later stage; 2. It can realize the transportation of materials in closed pipelines, and the materials will not be affected by moisture or deterioration, so as to reduce the dust pollution to the environment; 3. The pipeline can be arranged according to the original setting of the plant, and the layout of the transmission pipeline is flexible 4. Large conveying capacity, long conveying distance and high conveying speed; 6. In the conveying process, multiple operations can be carried out at the same time to improve the conveying efficiency