cement mill wheel

cement mills and raw mills for high throughput rates

cement mills and raw mills for high throughput rates

High throughput rates, permanent plant availability , optimized maintenance concepts features of the MVR mill and the patented MultiDrive enabling Gebr. Pfeiffer to meet the ever rising expectations of the industry. Thanks to the innovative drive and active redundancy, an unintended stop of the grinding process is practically excluded. No matter what type of material has to be ground cement raw material, cement clinker or granulated blast-furnace slag and how different their grindability and abrasiveness may be, the MVR mill ensures throughput rates of a different dimension, around the clock, reliably and on the long term. Forget about downtime. With Pfeiffer you will grind on a grand scale.

An MVR mill may have up to six grinding rollers and up to six drive units. Thus both systems are actively redundant meaning that one or several rollers can be taken out of the system for maintenance work while mill operation continues. The same applies to the independent drive modules of the MultiDrive.

High drying capacity, short dwell time of the material to be ground, and remote control of grinding pressure and classifier rotor speed ensure a fully automatic operation of the MVR mill even with varying raw material characteristics.

Thanks to the geometry of the grinding rollers in combination with their specific suspension, there is always a parallel grinding gap, ensuring a homogeneous compaction of the material to be ground. Moreover, due to the symmetric shape of the grinding roller tires, these can be turned when worn.

Up to six stationary grinding rollers roll on a rotating grinding table. The material is drawn in between the rollers and grinding table and ground by pressure and shear. The required pressure forces are produced by a lever system comprising, among others, a roller arm, along with a hydropneumatic tension system. After being rolled over by the rollers, the material is conveyed to a stationary nozzle ring due to the rotation of the grinding table. Gases (air or hot gas) flow through this nozzle ring, take up the ground and dried material and convey it to the classifier where it is separated by the rotating wheel (rotor) into grits and fines. The grits fall back into the grinding zone whereas the fines leave the classifier with the gas flow for being separated in cyclones or a filter.

Up to six stationary grinding rollers roll on a rotating grinding table. The material is drawn in between the rollers and grinding table and ground by pressure and shear. The required pressure forces are produced by a lever system comprising, among others, a roller arm, along with a hydropneumatic tension system. After being rolled over by the rollers, the material is conveyed to a stationary nozzle ring due to the rotation of the grinding table. Gases (air or hot gas) flow through this nozzle ring, take up the ground and dried material and convey it to the classifier where it is separated by the rotating wheel (rotor) into grits and fines. The grits fall back into the grinding zone whereas the fines leave the classifier with the gas flow for being separated in cyclones or a filter.

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 or hardfaced composite plates. Components which are specifically exposed to wear like gas outlet ducts have additional ceramic liners. All this is for optimum protection and short maintenance shutdown.

The highest wear occurs on the wear parts of the grinding elements as is the case with any type of vertical mill. Therefore, ease of replacement and regeneration is a major feature of the mill. The MVR mill has a modern hydraulic system used in operation and for maintenance alike. With this new type of roller suspension, the rollers can be swung out of the mill in a controlled way for ease of replacing the one-part grinding roller tires. The segmented wear parts of the grinding table are replaced, using a lifting device and the maintenance drive. Moreover, the rollers can be swung out separately. Hence grinding operation can be continued while maintenance work is done. The parts concerned can be regenerated both inside the mill and outside. Forget about downtime and maintenance problems! With active redundancy and easy maintenance you are up to date!

coal mill, gypsum mill, clay mill, etc. | pfeiffer mps mills

coal mill, gypsum mill, clay mill, etc. | pfeiffer mps mills

Highest flexibility with constant product quality, individually conceived, suitable for a variety of applications, undergoing constant development: with a number of more than 2800 mills sold, the MPS vertical mill is our proven allrounder. It can be used for the grinding of coal, petcoke, clay, limestone, quicklime and many other materials no matter how different their grindability and abrasiveness may be or whatever fineness or drying degree is required. The MPS mill also grinds, dries, calcines, and classifies gypsum without any problem, all in a single machine, for any fineness requested and considering individual requirements. The MPS vertical roller mill - built to last, reliable and energy-efficient - is the optimum solution when it comes to performing several process steps in one unit.

High drying capacity, short dwell time of the material to be ground, and remote control of grinding pressure and classifier rotor speed ensure a fully automatic operation of the MPS mill even with varying raw material characteristics.

Three stationary grinding rollers roll on a rotating grinding table. The material is drawn in between the rollers and grinding table and ground by pressure and shear. The required pressure forces are produced by a hydropneumatic tension system. After being rolled over by the rollers, the material is conveyed to a stationary nozzle ring due to the rotation of the grinding table. Gases (air or hot gas) flow through this nozzle ring, take up the ground and dried material and convey it to the classifier where it is separated by the rotating wheel (rotor) into grits and fines. The grits fall back into the grinding zone whereas the fines leave the classifier with the gas flow for being separated in cyclones or a filter.

Three stationary grinding rollers roll on a rotating grinding table. The material is drawn in between the rollers and grinding table and ground by pressure and shear. The required pressure forces are produced by a hydropneumatic tension system. After being rolled over by the rollers, the material is conveyed to a stationary nozzle ring due to the rotation of the grinding table. Gases (air or hot gas) flow through this nozzle ring, take up the ground and dried material and convey it to the classifier where it is separated by the rotating wheel (rotor) into grits and fines. The grits fall back into the grinding zone whereas the fines leave the classifier with the gas flow for being separated in cyclones or a filter.

Three stationary grinding rollers roll on a rotating grinding table. The material is drawn in between the rollers and grinding table and ground by pressure and shear. The required pressure forces are produced by a hydropneumatic tension system. After being rolled over by the rollers, the material is conveyed to a stationary nozzle ring due to the rotation of the grinding table. Gases (air or hot gas) flow through this nozzle ring, take up the ground and dried material and convey it to the classifier where it is separated by the rotating wheel (rotor) into grits and fines. The grits fall back into the grinding zone whereas the fines leave the classifier with the gas flow for being separated in cyclones or a filter.

Three stationary grinding rollers roll on a rotating grinding table. The material is drawn in between the rollers and grinding table and ground by pressure and shear. The required pressure forces are produced by a hydropneumatic tension system. After being rolled over by the rollers, the material is conveyed to a stationary nozzle ring due to the rotation of the grinding table. Gases (air or hot gas) flow through this nozzle ring, take up the ground and dried material and convey it to the classifier where it is separated by the rotating wheel (rotor) into grits and fines. The grits fall back into the grinding zone whereas the fines leave the classifier with the gas flow for being separated in cyclones or a filter.

Three stationary grinding rollers roll on a rotating grinding table. The material is drawn in between the rollers and grinding table and ground by pressure and shear. The required pressure forces are produced by a hydropneumatic tension system. After being rolled over by the rollers, the material is conveyed to a stationary nozzle ring due to the rotation of the grinding table. Gases (air or hot gas) flow through this nozzle ring, take up the ground and dried material and convey it to the classifier where it is separated by the rotating wheel (rotor) into grits and fines. The grits fall back into the grinding zone whereas the fines leave the classifier with the gas flow for being separated in cyclones or a filter.

Three stationary grinding rollers roll on a rotating grinding table. The material is drawn in between the rollers and grinding table and ground by pressure and shear. The required pressure forces are produced by a hydropneumatic tension system. After being rolled over by the rollers, the material is conveyed to a stationary nozzle ring due to the rotation of the grinding table. Gases (air or hot gas) flow through this nozzle ring, take up the ground and dried material and convey it to the classifier where it is separated by the rotating wheel (rotor) into grits and fines. The grits fall back into the grinding zone whereas the fines leave the classifier with the gas flow for being separated in cyclones or a filter.

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. The grinding elements are primarily made of alloy cast iron as per DIN 1695, hardfaced cast iron or composite materials with high-chromium inserts in ductile base materials. The housings and other mill components are protected against jet wear with highly wear-resistant steel plates or hardfaced composite plates. Components which are specifically exposed to wear like gas outletducts have additional ceramic liners. All this is for optimum protection and short maintenance shutdown.

The highest wear occurs on the wear parts of the grinding elements as is the case with any type of vertical mill. Therefore, ease of replacement and regeneration is a major feature of the mill. With our proven Lift-and-Swing System, wear parts can be replaced rapidly through one single maintenance door. The grinding rollers and grinding table segments are driven to the maintenance door with the maintenance drive and are swung out of the grinding area. As a result maintenance downtime is reduced and work is easy and safe.

large cement plant for sale | cement plant with high production capacity

large cement plant for sale | cement plant with high production capacity

Product Name: Large Cement Production Plant / Cement Factory for Sale Capacity: 5000-10000 TPD Equipment: raw material crusher, raw meal grinding machine, storage yard, stacker reclaimer, preheater cyclones, rotary kiln, grate cooler, cement mill, etc. Cement Production: ordinary portland cement, pozzolana portland cement, white portland cement, quick-setting cement, refractory cement, etc.

In contrast to the mini cement plants, we usually call the cement plant with a clinker production capacity of more than 5000 TPD as the large cement plant. As a manufacturer who specializes in cement technology development and equipment upgrading and has over decades of cement machinery manufacturing experience, AGICO has the ability to design and build large cement plants with clinker production of up to 10,000 tons per day.

With the increase of plant scale and production capacity, the size and capacity of the crushers, cement mills, rotary kilns, and other machines in the cement plant also increase correspondingly. Therefore, the increase of plant scale should be accompanied by the growth and development of cement manufacturing machinery so as to maintain or even improve the efficiency and productivity of cement plants.

Compared with mini cement production lines, large cement plants have higher energy consumption. But take into account their output, they actually have a higher energy utilization rate and production efficiency, which can save production costs for cement manufacturers in the long run. Also, the operating efficiencies of large plants are high. The fuel consumption is around 650 700 kcal/kg clinker; power consumption is between 65-80 kWh/ton, and man-hours required per ton of cement are as low as 0.15.

AGICO large cement plants are best suited for manufacturing cement by dry process. The cement-making machines in our large cement plants include cement crushers, cyclone preheating systems, rotary kilns, cement mills, and other auxiliary equipment.

The purpose of raw material preparation in the dry process of cement manufacturing is to reduce large-sized raw materials to the proper size and mix them into homogenized raw meals. We will install the most suitable crushing machinery in the cement plant according to the raw materials and production requirements of customers, so as to achieve economic and green production as much as possible.

The application of cyclone preheating system in cement plant hugely reduces the heat loss and fuel consumption in the clinker burning process, and also significantly reduces the floor area and pollution emission of the whole plant.

The 5-stage cyclone preheater is the most installed preheating system in our large cement plants. According to customers requirements, we could design other stage preheaters for the cement plant. The cyclone preheater uses hot exhaust gas from the rotary kiln as its heat source. Before entering the rotary kiln, the cement raw meal heat exchanges with the high-temperature gas in the preheater to preheat.

The rotary kiln is where the burning phase of the cement manufacturing process takes place; it is the core part of a cement plant. The raw meal in the rotary kiln will be heated to 1,500 during the burning process to form cement clinker.

The production capacity of a cement plant is directly determined by the capacity of the rotary kiln. Our large rotary kilns can fully meet the requirement of bulk cement production. Together with the advanced preheating system, our rotary kilns could achieve high rotary speed and high output per unit volume. The good sealing effect of our rotary kilns allows them to fully recycle the waste heat and produce high-quality clinker.

Cement mills are used for raw material reduction and cement grinding in the cement manufacturing process. The cement grinding process is the final manufacturing stage at a cement plant. After this process, the clinker will become fine cement powders and ready to be packed.

The most used cement mills in our large cement plants are cement ball mills and vertical roller mills. Both of them can well undertake the task of cement grinding, we will take their production efficiencies, power consumptions, investment costs, product particle shapes and sizes, maintenance fees, and other elements into account and decide which one to use when designing a cement plant.

portland cement plant for sale | new dry process of portland cement manufacture

portland cement plant for sale | new dry process of portland cement manufacture

In the Portland cement manufacturing process, most raw materials need to be crushed first, such as limestone, clay, iron ore, and coal. Limestone is the main material for Portland cement production, and the particles of limestone generally have a large size and strong hardness when they are mined. Therefore, it is quite necessary to crush them (with crushers) before we use them for cement production. The raw material pre homogenization technology of Portland cement is to realize the preliminary homogenization of raw materials by using the scientific stacking and reclaiming method (bucket wheel stacker reclaimer) in the raw material storage and reclaiming process so that the storage yard has the function of storage and homogenization at the same time.

At least 3 tons of materials (including various raw materials, fuel, clinker, etc.) need to be ground to produce one ton of Portland cement. According to statistics, the grinding process in the dry process of cement production line consumes more than 60% of the power of the whole plant, of which raw material grinding accounts for more than 30%, coal grinding accounts for about 30%, and cement grinding accounts for about 40%. Therefore, reasonable selection of grinding equipment and process flow, optimization of process parameters, correct operation, and control of the operating system is of great significance to ensure product quality and reduce energy consumption.

Our homogenization equipment uses the funnel effect generated by gravity to make the raw material powders cut as many raw material layers as possible while falling down, so they can be fully mixed. The pressure between different fluidizing air causes the fluidizing expansion of parallel raw material layers with different sizes. Some areas are unloaded and some areas are fluidized so that the raw material surface in the storehouse is inclined to perform radial mixing and homogenization.

When the material powder is brought into the cyclone by the airflow, it will be forced to rotate and flow in the annular space between the cyclone body and the inner cylinder (exhaust pipe), and move downward while rotating. From the cylinder to the cone, it extends to the end of the cone and then rotates upward to rise, and finally, it is discharged by the exhaust pipe.

Using the preheater to realize part of the function of the rotary kiln can shorten the length of kiln, and the gas-material exchange process, which is performed in an accumulated state in the kiln, can be performed in the suspended state in the preheater. So the raw material can be fully mixed with the hot gas discharged from the kiln, increasing the contact area of the gas material. This method has fast heat transfer speed and high heat exchange efficiency, and improves the production efficiency of the kiln system and reduces the heat consumption of clinker firing.

The raw materials will be sent into the rotary kiln for calcining after being preheated and pre-decomposed in the preheater. In the rotary kiln, the carbonate will further decompose, and by a series of rapid solid-phase reactions, it will generate C3A, C4AF, C2S, and other minerals in the cement clinker. With the temperature rising to 1300 Celsius degrees, C3A, C4AF, C2S, and other minerals will become liquid phase. C2S and CaO dissolved in the liquid phase will react and generate a large number of C3S (clinker).

After the raw materials are calcined to clinker, the temperature begins to decrease. Finally, the high-temperature clinker discharged from the rotary kiln is cooled by the cement clinker cooler to the temperature that the downstream transport, storage, and cement mill can bear. Meanwhile, the heat of the high-temperature clinker is recovered by the cooler to improve the thermal efficiency and the clinker quality.

Cement grinding is the last, but also the most power-consuming procedure in cement production. Cement grinding is to grind the cement clinker (and gelling agent, performance regulating material, etc.) to a suitable particle size (expressed by fineness, specific surface area, etc.), form a certain particle size distribution, increase its hydration area, accelerate the hydration speed, and meet the requirements of cement paste setting and hardening.

Since it was invented in the early 19th century by Joseph Aspdin, Portland cement has gradually become the most common type of cement and is widely used around the globe. The Portland cement is mainly made from limestone and is the basic ingredient of concrete, mortar, stucco, and other building materials.

After nearly 200 years of development, the manufacturing process of Portland cement has been continuously improved. At present, the new dry process is the most mature and most used process for Portland cement production.

Related Equipments