Performance characteristics and material selection of multi-stage air classifier
Performance characteristics of multi-stage air classifier:
1. Large output, low energy consumption and high grading efficiency.
2. Concentrated particle size: The machine uses an original vertical impeller for classification. The stable classification technology and special sealing measures effectively prevent the leakage of coarse particles, so that the product has no large particles, the particle size is concentrated, and the classification accuracy is high.
3. Reasonable structure: products with 1-6 granularities can be produced at the same time according to user requirements.
4. Strong applicability: It can be combined with various mills (jet mill, mechanical mill, ball mill, Raymond mill, vibration mill, etc.) to form a closed-circuit or open-circuit combined operation.
5. High degree of automation: all impeller classifiers at all levels adopt electronic frequency modulation and stepless speed regulation, and the automatic circulation type multi-box dust collection process realizes electronic control and automatic dust removal, which improves the stability of the negative pressure of the whole machine.
Maintenance method of multi-stage air classifier:
1. All lubricating points are lubricated with sodium-based grease or calcium-based grease.
2. Check whether the lubricating oil inside the reducer is on the line of the oil needle every shift, and change the oil every 6 months.
3. Frequently check whether the bearing bushes, bearings and sealing rings of the lower support or intermediate frame are worn out, and whether the bearing bushes are damaged in order to replace them in time.
4. For bearing lubrication, a manual dry oil pump must be used to inject high-pressure oil into the bearing every 4 hours to maintain the sealing performance of the bearing.
For the equipment materials of the multi-stage air classifier, there are mainly three types: carbon steel, stainless steel, and carbon steel plus wear protection. Choose the appropriate equipment material according to the characteristics of different materials.
The overall cost of a multi-stage air classifier made of carbon steel is lower than that of stainless steel and carbon steel with wear protection. For materials used in the food and pharmaceutical industries, stainless steel equipment is usually used, so that no pollution will be caused during the classification process. For materials with high hardness such as quartz, carbon steel and internal ceramic wear protection are used to extend the service life of the equipment and reduce the frequency of replacing parts.
Multi-stage air classifiers are widely used in the kaolin industry. Kaolin is a non-metallic mineral with kaolin as the main mineral composition. It is mainly used for household ceramics, building sanitary ceramics and refractory ceramics. It is also used for papermaking and construction. As fillers or white pigments for paints, rubber, plastics, textiles, etc., kaolin has been used in many industries.
At present, kaolin mainly relies on mechanical pulverizers and jet pulverizers for fine and deep processing. The mechanical crusher generally crushes to about 700-1000 mesh, but the use of mechanical crushing will increase the iron content in the final product, which is not suitable for industries that require purity. The jet mill can pulverize to 1000-5000 mesh, and the product produced has a finer particle size and higher purity. For industries with relatively high application purity requirements, multi-stage airflow classifiers should be used.