cement vertical mill

vertical raw mill | cement raw mill | raw mill in cement plant

vertical raw mill | cement raw mill | raw mill in cement plant

Vertical raw mill is one kind of raw mill, generally used to grind bulk, granular, and powder raw materials into required cement raw meal in the cement manufacturing plant. Vertical raw mill is an ideal grinding mill that crushing, drying, grinding, grading transfer set in one. It can be widely used in cement, electric power, metallurgy, chemical industry, non-metallic ore, and other industries.

Foundation support: The foundation seat of the vertical raw mill is a set of steel welding parts, which is buried in concrete. The driving device of the vertical raw mill and the fixed seat of the tensioning hydraulic cylinder are installed on the foundation support.

Grinding table liner: The wear-resisting liner is fastened on the grinding table and the grinding roller rotates on the wear-resisting lining plate. The raw material is ground between the grinding table and the grinding roller.

Grinding roller: There are four grinding rollers, which are distributed on the grinding table. The diameter of the grinding roller is 2240m. When the grinding table liner and roller skin reach a certain limit of wear, it shall be replaced.

Hydraulic tension system: the hydraulic cylinder produces the pressure needed for the grinding roller to tighten, and the tension rod transmits the tension force of the hydraulic cylinder. The hydraulic cylinder is equipped with a nitrogen airbag to absorb the vibration of the raw mill during operation.

Auxiliary drive: The main engine drive is equipped with an auxiliary drive device, which can make the vertical raw mill start smoothly. The auxiliary drive is also used for the accurate position required in the inspection of the grinding table and the maintenance of the grinding roller.

Grinding: The raw material enters into the grinding through the sliding tube. Under the action of centrifugal force, it moves circumferential around the center of the grinding disc and radially outward along the grinding disc to enter the grinding area. There is a retaining ring around the mill, and the material forms a material bed on the vertical raw mill.

Selecting: except part of the fine powder is discharged with the airflow, and the rest of the material overflows from the retainer ring and is fed into the dynamic cement separator by the external circulation bucket elevator. The fineness of the finished product is R0.09 < 12%, and the coarse material is re-put into the vertical raw mill.

Drying: The heat source of drying materials comes from the 300 hot flue gas in the preheater at end of the cement rotary kiln, which is divided into two ways and sent to the vertical raw mill and the stepped cement separator respectively, and then into the dynamic cement separator and electric dust collection.

important operation tips for cement vertical mill

important operation tips for cement vertical mill

Regardless of Rotary kiln operation or grinding, it is necessary to clarify the inherent logical relationship of the system, which requires the operator to have a clear understanding of the characteristics of the system process and equipment.fully understand the dialectical relationship between qualitative and quantitative.

Operator must first learn about the operation of the system.Which equipment has hidden dangers, and how does production influence on cement quality.Read the full analysis report sheet to understand the material's grindability so that targeted control can be achieved.It is necessary to familiarize yourself with the operation interface of the central control and know the field equipment very well, so you should always go to the site to understand the situation of the equipment.Especially when the field device fails, you need to know the cause of the failure and the method to solve the problem.

The proper thickness of the layer and stable layer are basis for stable operation. The material layer is too thick will lead to grinding efficiency reduction, and when pressure difference of the mill reaches the limit, the material will collapse, which will affect main motor and venting system; If material layer is too thin, with driving force of the mill increases, the grinding roller, disc and hydraulic system are damaged.

Excessive vibration of the vertical mill not only directly causes mechanical damage, but also affects production and quality.The factors that cause vibration are: the basis of the mill, the grinding pressure, the thickness of the layer, the air volume and the air temperature, the accumulator pressure, the wear of the roller surface or the grinding disc, and the like.

The influence of materials on vertical mill vibration and the treatment method: it is mainly reflected in the particle size, the wearability and the moisture. In the vertical grinding operation process, to form a stable material layer, it is required that the grinding material has a suitable gradation, and more than 95% of the particle size is less than 3% of the roller diameter. Excessive feed size will result in poor grindability. Since the gap between the bulk materials is not filled with enough fine particulate material, the buffering performance of the material bed is poor, and the impact force when the material is crushed is difficult to absorb, resulting in an increase in vibration. The feed size is too small, especially when the powdery material is long, because the small particle material has small friction and good fluidity. The lack of large materials constitutes a supporting skeleton, and it is difficult to form a stable material bed. The grinding roller can not be effectively pressed and crushed. A large amount of powdery material will increase the dust concentration and ventilation resistance in the airflow. When the limit is reached, the material will collapse and mill vibration will increase.

When the material is too fine, especially when the internal pressure difference of the vertical mill has risen significantly, the feeding should be adjusted in time, grinding pressure and outlet temperature should be reduced and the water spray amount should be increased, powder separator speed should be appropriately reduced. The grinding pressure is increased under the premise of ensuring stable pressure difference and layer thickness.

Material grindability is an important factor affecting the yield. When material grindability deteriorates, grinding cycles number of vertical mill increases significantly. Since most of the material is crushed into fine powder, but it can not meet the requirements of the finished product, it cannot be taken out of the mill by the airflow. As the fine particle material on the grinding disc increases, there will be a situation similar to the fineness of the feed size. Vertical grinding pressure The difference is increased, the ventilation is not smooth, and the external circulation and internal circulation are greatly increased. At this time, the material layer will become extremely unstable, the load of the powder separator will increase, the thickness of the material layer will increase, and the load of the mill will increase. If it is not treated in time, the vibration of the vertical mill will be further aggravated and the main motor will be overcurrent.

The influence of material moisture on the vibration of the mill can not be ignored. If the moisture content of the material is too low, it is difficult for the dried material to reliably form a stable bed on the grinding disc, which inevitably causes the mill to vibrate. When the moisture is too high and the layer on the grinding disc is too low, it is easy to form a cake, which increases the vibration of the mill. For example, in order to meet the material drying requirements, it is necessary to provide a larger air volume and a higher air temperature, which will make the wind speed in the mill higher, and the material that should be settled and dropped is forced to suspend, the external circulation is reduced and the internal circulation is increased. At the same time, due to the high adhesion of the high moisture material, the thickness of the upper layer of the grinding disc is thickened, which increases the chance of collapse and the balance of the bed.

The accumulator mainly provides cushioning for the lifting of the roller set. If the pressure of the accumulator is too high or the nitrogen balloon is broken, the buffering effect will be reduced or even completely lost, resulting in a hard impact of the grinding roller group and the material bed causing severe vibration of the mill.

The vertical grinding water spray system plays an important role in stabilizing the material bed, especially in the case of more powdery materials or low water content in the raw materials, the effect is more obvious, the toughness and rigidity of the material can be increased, and the material grinding is facilitated, protect the roller surface and the grinding disc. The height of the retaining ring determines the maximum thickness of material bed. When the retaining ring is too low, the material layer as the cushion is thinned, the buffering effect is weakened, and the grinding machine will vibrate, and the high ring will cause grinding. Reduced efficiency, reduced production and increased electricity consumption. Excessive wear of the scraper plate, uneven wear of the guide vane and the wind deflector will cause uneven distribution of the air volume in the wind ring and the mill, resulting in different thickness of the material on the grinding disc, causing vibration. Excessive or too low temperature in the mill can lead to damage to the stability of the layer, especially when the temperature is too high, the material on the disc becomes very loose and easy to flow. Not only the material layer is thinned, but also it is not easily crushed by the grinding roller, causing vibration. If the temperature is too low, the material has poor fluidity and is easy to accumulate on the grinding disc, which will result in thickening of the material layer and a decrease in grinding efficiency.

Grinding pressure is the main factor affecting the quality of production. The grinding pressure is adjusted according to the amount of grinding machine feed, material size and easy grinding.In order to maintain a layer of material with a certain thickness on the grinding disc, reduce the vibration of the mill and ensure stable operation, the pressure of the grinding roller must be controlled.When the grinding pressure is increased, the grinding capacity of the mill is increased, but after reaching a certain critical point, it does not change.If the hydraulic cylinder setting pressure is too high, it will only increase the driving force and accelerate the wear of the components, and will not improve the grinding ability.This feature is similar to the working principle of a roller press.However, some manufacturers reduce the maximum value of the grinding pressure when setting the maximum grinding pressure, taking into account the protection equipment.When the grinding pressure is low, the thickness of the layer increases, the current of the main motor increases, the pressure difference within the mill increases, and the vibration of the mill increases.When the grinding pressure is high, the thickness of the layer decreases and the current of the main motor increases.The vibration speed of the mill increases and the component damage is accelerated.So maintaining a proper grinding pressure is a critical operation.

When the temperature of the outlet gas of the mill is too low, the fluidity of the material will be deteriorated, and the qualified finished product cannot be extracted in time. When the pressure difference in the mill is too high, the material will collapse.The method of raising the temperature includes: increasing the suction of the mill, adjusting the fineness by the classifier; increasing the opening of the hot damper to reduce the opening of the circulating wind.These methods are also applicable to other types of raw material mills.However, if the temperature is too high (above 130 C), it will also cause damage to the equipment.The dividing wheel in the lower part of the cyclone will expand and become stuck, and the lubricating grease of the grinding roller will also be cracked.It is also disadvantageous for the tail dust bag.If there is too much powder on the grinding disc, the thickness of the layer will be unstable, so it is necessary to control the outlet temperature of the mill.Each mill has its own adaptation temperature, and the operator must master it during operation.For safety reasons, it is best not to close the inlet damper into the humidification tower during production.

The system air volume must be matched with the feeding amount. The method of adjusting the air volume can generally be controlled by adjusting the power of the mill circulating fan or adjusting the opening degree of the kiln exhaust fan.The wind is going big.When the system air volume is too large, the internal pressure difference decreases, the main motor current decreases; the thickness of the material layer is too low, the vibration value is large, and the sieve residue increases.When the system air volume is too small, the thickness of the material layer increases, the internal pressure difference increases, the main motor current increases, and the vibration of the mill increases.

Feeding is large and satiety is a major cause.However, when the material is poor in wearability, it will also slag.The size of the grinding material is large, the system air volume is insufficient, the grinding pressure is low, the system leaks air, the material layer is unstable, the material ring is low, and the roller surface or the grinding disc wears seriously, which will cause the grinding machine to slag more.

When the raw material is running in the vertical mill, the drying heat source of the material comes from the hot gas at the kiln tail. Therefore, when the vertical mill is operated, the control of the inlet and outlet dampers should be balanced by the kiln mill.When the vertical mill inlet and outlet dampers are balanced, the system's wind will be balanced and will not affect the pressure at the kiln end.

Before the grinding starts, it is necessary to stack enough material on the grinding disc so that when the grinding roller falls and grinds, it will not stop due to high vibration.However, the material layer should not be too high, otherwise the main motor current will be high when the roll is ground, which is unfavorable to the equipment.The air pressure at the nozzle ring before grinding is a key value for the observation level.The situation of each vertical mill is different, and it must be reasonably controlled according to circumstances.Try to increase the ventilation before stopping the machine to make the fine powder into the reservoir as much as possible.If the fine powder is excessively rolled, the vibration of the mill is large.

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vertical cement mill | cement clinker grinding equipment in cement plant

vertical cement mill | cement clinker grinding equipment in cement plant

Vertical cement mill is a kind of vertical roller mill, also known as VRM cement mill, mainly used in the grinding production of cement clinker. Our company absorbs the latest grinding technology from Europe and combines with the market demand of grinding industry to develop a new and improved vertical cement mill. This vertical cement mill solves the technical problems of low output and high energy consumption of mining and cement milling equipment. It combines drying, grinding, powder selection and lifting functions to effectively improve production efficiency.

The vertical cement mill is especially suitable for large-scale milling of various ores, and grinding of various block, granular and powder materials because of its superior performance. So it is widely used in cement, electric power, metallurgy, glass fiber, coal and other industries.

Vertical cement mill appears later than cement ball mill, which makes up for many shortcomings of cement ball mill and has more advantages. In the past, due to the limitation of cement ball mill production, many cement companies were unable to expand production scale and development was once restricted. The appearance of VRM cement mill solves the contradiction between small output of grinding equipment and mass production demand.

As a ball mills supplier with 22 years of experience in the grinding industry, we can provide customers with types of ball mill, vertical mill, rod mill and AG/SAG mill for grinding in a variety of industries and materials.

vertical raw mill for cement raw meal grinding in cement factory

vertical raw mill for cement raw meal grinding in cement factory

Applications: It can be used for grinding limestone, gypsum, siliceous, coal and other materials. It is mainly used in cement raw materials grinding section of cement factory, and also be used in concrete and mineral fields.

Vertical raw mill is important equipment widely used in the cement raw meal (cementraw materials) grinding section of the cement production process in cement plant. Because the vertical raw mill is the use of roller grinding principle to crush materials, its vertical raw mill operation is more efficient and energy-saving, product output is more stable, so in cement industry, electric power, metallurgy, chemical industry, metal, and non-metal ore industry is also well used.

Vertical raw mill is widely used in cement industry. In the process of cement production in cement plant, cement raw meal needs to be ground by grinding equipment before calcination. Cement raw meal includes limestone, gypsum, silica, clay, fly ash and other components. Because these materials are mixed together and have special properties, so there is a high requirement for the material suitability of the grinding equipment. The vertical raw mill operation process is simple, the floor space is small, the noise is low, the dust is less, and the adaptability to different materials is strong. So the vertical raw mill particularly suitable for the grinding of cement raw meal in cement factory. The vertical raw mill in cement industry has been applied in the field of medicine and food because of its high grinding efficiency, can dry up to 10% moisture materials and energy saving of 20% 30% compared withball millof the same scale.

As a ball mills supplier with 22 years of experience in the grinding industry, we can provide customers with types of ball mill, vertical mill, rod mill and AG/SAG mill for grinding in a variety of industries and materials.

vertical roller mills

vertical roller mills

With the many advantages vertical roller mills offer, we continually develop our VRM offering with the latest upgrades, including the OKTM Mill and the ATOX Coal Mill. The OKTM Mill skilfully comminutes raw material, cement and slag. It features a patented roller and table design and concrete mill stands instead of traditional, heavy steel structures.

The OKTM Mills flexible design makes it possible to operate it with a number of rollers out of service while still reaching 60 to 70 percent of the normal operation output, minimising production losses.

The compact and long-lasting ATOX Coal Mill has the capability to grind virtually all types of raw coal, to your desired fineness. It is suitable for feed materials with varying moisture percentages, handling abrasive and sticky raw coal with ease.

The cement industrys focus on energy reduction has made vertical roller mills particularly compelling. Grinding systems in cement production make up approximately 85 to 90 percent of total plant electrical energy consumption. As vertical roller mills are 30 to 50 percent more efficient than other grinding solutions, they give cement plant owners a great opportunity to

When it comes to grinding raw coal, savings in specific energy consumption can be achieved with vertical roller mills. Specific energy consumption depends on the grindability of the raw coal and the coal meal fineness required. A dynamic separator that ensures high separation efficiency also helps to reduce specific energy use.

FLSmidth provides sustainable productivity to the global mining and cement industries. We deliver market-leading engineering, equipment and service solutions that enable our customers to improve performance, drive down costs and reduce environmental impact. Our operations span the globe and we are close to 10,200 employees, present in more than 60 countries. In 2020, FLSmidth generated revenue of DKK 16.4 billion. MissionZero is our sustainability ambition towards zero emissions in mining and cement by 2030.

cement vertical mill for sale

cement vertical mill for sale

The vertical mill is divided into coal vertical mill, slag vertical mill and cement vertical mill according to the application. Cement vertical mill is pressurized by hydraulic system, and the pressure acts on the material between the grinding roller and the grinding disc to achieve the purpose of grinding, vertical High grinding efficiency, 20-30% energy saving than ball mill; can simultaneously dry materials with up to 10% moisture; product fineness is easy to adjust; product particle size distribution is uniform; system process is simple; small footprint; low noise Less dust; easy operation and maintenance. With the improvement of vertical grinding technology, it has also been applied in the fields of medicine and food.

The vertical mill consists of a separator rotation system, a separator part, and an upper casing part upper casing with an inspection door and a feed port, a roller device, a transmission device, a tie rod portion, a disc seal, an upper and lower side, a side friction ring, and an unloading material ring, grinding disc adjusting device, air ring adjusting device, grinding roller pressing system, guide rail protection device, tie rod sealing device, bearing sealing air supply part, inlet oil groove part, internal air pipe sealing, powder selection hydraulic lubrication system.

The motor drives grinding disc to rotate through reducer, and raw material falls from the feeding port to the center of grinding disc, and hot air enters the grinding chamber from the air inlet. Under the action of centrifugal force, the material moves to the edge of grinding disc, and is crushed by the grinding roller through the annular groove on the grinding disc. Pressed and pulverized, the pulverized material is taken up from the edge of grinding disc by the high-speed airflow of wind ring. The large particles fall directly on the grinding disc and re-grind. When raw material in the airflow passes through the classifier, the coarse powder falls under the action of the rotating rotor. The grinding disc is re-grinded, and the qualified fine powder is ground together with airflow and collected in the dust collecting device, which is final product. The moisture-containing material is dried during contact with the hot air.

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cement vertical mill - vertical grinding mill - vertical mill | agico

cement vertical mill - vertical grinding mill - vertical mill | agico

The cement vertical mill is a grinding equipment developed on the basis of similar grinding mills, so it has many irreplaceable advantages, such as high grinding efficiency, low power consumption (20-30% less power than ball mill), large drying capacity (simultaneously dry and grind materials with moisture up to 10%), large particle size of grinding materials, simple grinding process, small floor area, low noise and wear, long life and other advantages. This kind of machine uses a hydraulic system to make the pressure act on the material between the roller and the grinding disc, so as to achieve the purpose of grinding. AGICO, as a cement equipment manufacturer in China, supports high-quality coal vertical mill, raw material vertical mill, and thecement vertical mill.

The cement vertical mill consists of a classifier, upper housing, access door, feeding port, transmission device, roller, pull rod, balk ring, grinding table, air ducting ring, swinging arm, gearbox, hydraulic system, etc.

AGICO Group is an integrative enterprise group. It is a Chinese company that specialized in manufacturing and exporting cement plants and cement equipment, providing the turnkey project from project design, equipment installation and equipment commissioning to equipment maintenance.

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