• 27 Oct, 2022
• By EPIC Powder
• 2 Comments

What are the differences between air flow mill and mechanical mill? With EPIC Powder Machinery

As a kind of superfine pulverizing equipment, air flow pulverizer has very high evaluation among users. But the mechanical crusher, which can also be called as the ultra-fine crushing equipment, also has a high application rate in many fields. So what is the difference between the two types of equipment? What are the specific aspects? The following is the source manufacturer of domestic ultra-fine pulverizer&mdash& mdash; The editor of Qingdao EPIC Powder Machinery will introduce it to you

First of all, the principle of air flow pulverizer is different from that of mechanical pulverizer. The air flow pulverizer uses materials to obtain huge kinetic energy under the action of high-speed air flow, causing high-speed collisions and serious friction between material particles in the crushing chamber, and at the same time, high-speed air flow shears materials, so as to achieve the purpose of crushing materials. The mechanical crusher uses the revolving body (handle, hammer, plate, etc.) rotating at a high speed around the horizontal or vertical axis to violently impact the material, so that it collides with the fixed body or between particles, so that the material can be crushed. The difference between air flow mill and mechanical mill is mainly reflected in the following points: 1. Yield: Our air flow mill accelerates the materials to the same crushing strength by establishing a uniform crushing flow field, and the materials are quickly separated from the qualified particles after a collision; The materials stay in the crushing chamber for a very short time, which effectively avoids the over crushing of products and improves the yield. When producing 40-120 mesh (+40≤ 25%, - 120 mesh≤ 10%) products, the yield shall not be less than 87%; When producing 40-325 mesh (+40≤ 1%, - 325≤ 1%) products, the yield shall not be less than 85%. Other mechanical crushing cannot establish a uniform crushing force field. After multiple collisions, some qualified particles cannot be discharged in time after crushing, resulting in over crushing, which increases the content of fine powder, and the yield is relatively low. In addition, there are few adjustment methods for mechanical crusher. Generally, the grinding force can only be controlled by adjusting the speed of the mill, which has certain limitations. The equipment is easy to wear, and has a great impact on the particle size distribution and yield of products. 2. Screening Our company's air flow crusher is equipped with an efficient turbine classifier. After the materials are crushed, the fine powder is separated by the turbine classifier, and the finished products and coarse particles are screened again. In this way, the materials are easy to pass the screen, which not only greatly improves the screening efficiency, extends the service life of the screen, but also ensures the screening rate of the materials. Due to the small content of fine powder in the screening materials, the fine powder flying in the screening process is avoided, The production environment is clean. The particles crushed by the mechanical crusher are of mixed particle size, and the coarse and fine powders are mixed together. During screening, the fine powder is easy to adhere to the coarse particles and is not easy to pass through the screen. The materials stay on the screen for a long time, wear the screen greatly, the screening efficiency is relatively low, and the dust is relatively large in the screening process. And more superfine powder adhere to qualified particles, which will have a certain impact on product quality. 3. Equipment wear and maintenance rate The air flow pulverizer unit of our company uses air flow as the pulverizing power, and the equipment itself has no rotating parts, which greatly extends the service life of the main machine's pulverizing parts. The MQW type air flow pulverizer unit specially designed for metal silicon has not been replaced by our customers after nearly two years of use. The main crushing equipment is extremely worn, and the equipment can operate stably for a long time, with stable product quality. The main wearing part of the air flow pulverizer is the grading wheel of the turbine classifier, which has a service life of more than 1500 tons, is easy to replace and has a short time. The mechanical crusher uses a medium to impact, rotate and roll materials. Due to the high hardness of metal silicon and its sharp angle shape, the solid wear on the equipment is quite large. Generally, it needs to repair and replace spare parts within 3-5 days. The equipment maintenance workload is heavy, the cost of wearing parts is high, and the replacement is time-consuming, affecting production. 4. The difference of product purity The air flow pulverizer uses air flow to crush materials. The wear of the equipment is very small, and the parts that are easy to wear are all treated with wear-resistant protection. Therefore, the product has high purity and does not need magnetic separation and pickling. The mechanical crusher uses a medium (hammer) to crush materials at high speed. The equipment is severely worn, and the impurities from the wear are naturally brought into the product, causing product pollution and increasing iron content. 5. Differences in particle morphology The particle size distribution of the products produced by our air flow pulverizer is uniform and normal, the surface is honeycombed with large specific surface area observed under the electron microscope, and there is very little superfine powder adhered to the finished product particles, which is conducive to the production of the next process. The particle size distribution of the products produced by the mechanical crusher is uneven, and there are stages. The particles are flake/strip, the surface is too smooth, and the specific surface area is small. Because there is no air flow classification device in the system, the particle surface is adhered with ultra-fine powder, which has a certain impact on the product quality. 6. Differences in production environment The whole system of our air flow pulverizer is operated under full negative pressure. The equipment adopts the most advanced offline pulse dust remover in separate rooms. There is no dust in the whole production process. The production environment is clean and there is no fine powder loss. In the production process of mechanical crusher, there is a large amount of dust, the production environment is very poor, and the silicon powder loss is large. The above is the difference between air flow mill and mechanical mill listed by EPIC Powder Machinery. Have you seen it and understood it? EPIC Powder Machinery is the source manufacturer of air flow mills in China, specializing in the production of air flow mills, air flow classifiers, mechanical impact mills, inert gas protection crushing classifiers, etc., which can provide free incoming material tests and inspections