Depending on the abrasiveness of the material to be ground and areas to be protected, different wear materials are used on our vertical roller mills. Alloy cast iron as per DIN 1695, hardfaced cast iron or composite materials with high-chromium inserts in ductile base materials: the grinding elements designed by Pfeiffer are made of high-quality materials ensuring a long lifetime. The housings and other mill components, too, are protected against wear with highly wear-resistant steel plates
quality of cement produced by vertical mill . Best energy consumption International Cement Review. The addition of closed circuiting and progressively higher efficiency separators has improved cement product quality and produced higher outputs for a given mill size, but the case for adding or upgrading separators on energy saving alone has proved to be poor, unless the products are >4000Blaine. People also ask Which is the best vertical roller mill for cement? Years of experience helping the cement and power plant industries achieve easy operation and maintenance, energy efficiency and cost savings underpin our expertly-designed vertical roller mill (VRM) product range. Whether grinding coal, clinker, cement and/or slag, we have a VRM solution to suit your grinding needs. Vertical Roller Mills - FLSmidth
A stable material layer with proper thickness is indispensable for the well functioning of the vertical roller mill. Too thick material layer will reduce the grinding efficiency of the vertical roller mill. When the pressure difference of the mill reaches the limit, the material layer will collapse and affect the operation of the main motor and the discharge system. Too thin material layer will cause the mill to generate stronger driving force and damage the rollers, millstone, and hydraulic system of the mill. See full list on cementplantsupplier.com Strong vibration of the mill body may cause to mechanical failure and has a bad effect on the product quality. There are many factors that may make mill body vibrate, including the grinding pressure, material layer thickness, air volume and temperature, accumulator pressure, wear condition of the roller and the grinding plate, etc. See full list on cementplantsupplier.com The grinding pressure is one of the key factors that have a great impact on the yield and quality of products. The grinding pressure of the mill should be adjusted according to the fed quantity, the particle size, and the grindability of the material. It must be well controlled to maintain the thickness of the material layer, reduce the vibration of the mill body, and ensure that the stable operation of the mill. Increasing the grinding pressure will improve the grinding capacity of the mill, but the grinding capacity will stop increasing when the grinding pressure reaches a certain critical point. If the set pressure of the hydraulic cylinder is too high, it will only increase the driving force and accelerate the wear of parts, but not improve the grinding capacity. Too low grinding pressure will lead to the increase of the material layer thickness, the main motor current, the pressure difference in the mill, and also the vibration amplitude of the mill. On the other hand, too high See full list on cementplantsupplier.com If the gas temperature at the discharging port of the mill is too low, the fluidity of the material will become poor, and the qualified products cannot be discharged from the mill in time. The gas temperature at the discharging port can be increased by increasing the opening of the hot air door and reducing the opening of the circulating air door. However, when the gas temperature exceeds 130 ℃, the equipment will also be damaged. For example, the dividing wheel at the lower part of the cyclone will expand and get stuck, and the lubricating grease of the grinding roller will dry and crack, which is also unfavorable to the tail dust collection bag. Each mill has its own adaptive temperature, of which the operators must be aware during the operation. See full list on cementplantsupplier.com In vertical roller mills, the air volume in the mill is determined by the material feed rate. The air volume can be controlled by adjusting the power of the circulating fan of the mill or the opening of the exhaust fan at the kiln tail. If the air volume is too large, the pressure difference in the mill and the current of the main motor will decrease, the thickness of the material layer will become thin, and the vibration degree of the mill body will become strong. If the air volume of the system is too small, the thickness of the material layer, the pressure difference in the mill, and the current of the main motor will increase, and so will the vibration speed of the mill. See full list on cementplantsupplier.com In the material grinding vertical mill, the heat source for drying the materials is the hot gas exhausted from the rotary kiln. When operating the vertical roller mill, the operator must control the inlet and outlet air valves to make the air volume of the system in a balanced state, so as not to affect the air pressure at the back end of the rotary kiln. We are AGICO, a professional cement equipment manufacturer and cement plant contractor. We have several models of vertical roller mills for sale. Please feel free to contact us for more information! See full list on cementplantsupplier.com Vertical roller mill, which made by prm is one advanced mill, adopting top technology domesic and abroad, and based on many years' mill experiences. Vertical roller mill has many different forms, but it works basically the same. They are with a reasonable and reliable structural design, with advanced technological process, set drying, grinding, classifying, improve in one, especially in large-scale grinding process, to fully meet customer demand.
The quality of the cement produced by both machines is almost the same, although vertical roller mills have a less complicated structure and higher efficiency, and require less maintenance. “China’s cement industry has a common goal, namely to eliminate ball mills in the entire production process,” Liu says.