dryer for cement ball mill

ball mill for cement grinding cement ball mill | ball mill manufacturers

The cement industry is a high energy consumption industry. Improving production efficiency and reducing energy consumption are the manufacturing principles that cement enterprises have been following. Cement ball mill is a kind of important cement equipment in the process of raw material preparation and finished product grinding in cement plants. It is mainly used to grind limestone, clay, and other cement raw materials, as well as calcined clinker. As we all know, in the whole process of cement manufacturing, the power consumption of traditional cement ball mill accounts for about two-thirds of the whole plant. According to statistics, the power consumption per ton of cement production is no less than 70 kW / h, but the effective utilization rate of this part of electric energy is very low. In order to improve the output of the cement ball mill grinding system and reduce energy consumption, we have done some researches and analysis and finally, find out effective solutions.

The application of pre-grinding technology is the main way to greatly increase the output of cement ball mill grinding system. According to the theory, it can be divided into pre-crushing and pre-grinding.

Pre-crushingit means to set up a fine crusher in front of the ball mill. Parts of the grinding tasks undertaken by the ball mill coarse grinding chamber are handed over to the high efficient fine crusher. This method features low investment and obvious effect, but it is necessary to solve the problem of material iron removal because the metal impurities such as iron in clinker will cause destructive damage to the crusher. After adding the pre-crushing equipment, the internal structure of the cement ball mill should be adjusted accordingly. As the particle size of the material is greatly reduced, the crushing capacity of the coarse grinding chamber should be appropriately reduced and then improve its grinding capacity.

Pre-grindingit refers to adding a grinding machine in front of the cement ball mill to increase the output of the original grinding system by a large margin. This method features large investment and relatively complex process but it can increase the output of cement ball mill by up to 50%. The equipment used for pre-grinding mainly includes rod mill, cement roller press, etc.

The function of cement separator is to reduce the unnecessary grinding amount of cement ball mill and improve its grinding efficiency by screening out the particles with certain fineness in time. The key technologies of cement separators are dispersion, classification, and collection.

Classification means that after materials are dispersed, the separator will make full use of the air classification function to separate the coarse and fine particles and send them to their respective outlets.

The JD series cyclone air separator is a new type of high-efficiency cement separator. Its powder selection efficiency is more than 80%, with small size, lightweight, flexible layout, and other characteristics. Besides, its system adopts a negative pressure operation with no dust pollution, so it is very suitable for cement manufacturing.

After referring to the characteristics of the closed-circuit grinding process, a new type of closed-circuit grinding system is formed by a cement ball mill and high-efficiency powder separator. The practice shows that the effect of increasing production and saving energy of this system is remarkable, which is more than 30% higher than that of the open-circuit grinding system and ordinary closed-circuit grinding system. It provides a new technical approach for increasing cement output and saving energy.

Redetermine the chamber length and adjust the grinding media gradation and material flow rate according to the material characteristics are very important for adding a pre-grinding system and powder separator, as well as the internal transformation of cement ball mill. Actually, each chamber of the ball mill has the function of crushing and grinding, but the degree is different. The main function of the coarse grinding chamber is crushing, so it should select large-diameter steel balls as the grinding media. The fine grinding chamber is used for grinding, so small diameter balls are more suitable. Materials are filled between these grinding mediums. The grinding efficiency depends on the contact area. If the contact area is large, there will be more grinding opportunities, and the product production rate per unit time will be high.

Grinding chambers adopt lining plates to enhance their function. The new high-efficiency lining plates on the market now integrate and optimize the functions of various lining plates so that one kind can give full play to the advantages of various types, maximizing the use of energy and reducing reactive power loss.

Due to the influence of many factors, such as the change of material particle size and grindability, the reasonable grinding media gradation is not constant, but relative. After a period of production, with the continuous wear of steel balls, their total load becomes smaller. We need to supplement the grinding media regularly.

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.

cement ball mill - jxsc machine

The cement ball mill is mainly used for grinding the finished products and raw materials of cement plants, and is also suitable for grinding various ore and other grindable materials in industrial and mining enterprises such as metallurgy, chemical industry, and electric power. Cement grinding is the last process of cement production, it is to mix cement clinker and a small amount of gypsum, and then grind the mixture to a certain fineness, that is cement. You may also interest in the ball mill product price, lime ball mill, quartz ball mill. Cement grinder types Cement ball mills can be divided according to discharge method: grate ball mills and overflow mills, and can be divided into wet mills and dry mills according to their processing conditions.

The main working part of the cement grinding mill is a rotary cylinder mounted on two large bearings and placed horizontally. The cylinder is divided into several chambers by a partition plate, and a certain shape and size of grinding bodies are installed in each chamber. The grinding bodies are generally steel balls, steel forgings, steel rods, pebbles, gravel, and porcelain balls. In order to prevent the cylinder from being worn, a liner is installed on the inner wall of the cylinder. When the cement grinding machine rotates, the grinding media adheres to the lining surface of the inner wall of the cylinder under the action of centrifugal force and frictional force with the lining surface of the inner surface of the cylinder, and rotates with the cylinder and is brought to a certain height. Under the action of gravity, it falls freely. When falling, the grinding media acts as a projectile and impacts the material at the bottom to crush the material. The cyclic motion of the abrasive body rising and falling is repeated. In addition, during the rotation of the mill, the grinding body also slides and rolls, so the grinding action occurs between the grinding body, the liner and the material, making the material fine. As new materials are continuously fed at the feed end, there is a material level difference between the feed and discharge end materials to force the material to flow, and the axial thrust of the impact material when the grinding body falls also breaks the material flow. Air movement also helps material flow. Therefore, although the mill barrel is placed horizontally, the material can slowly flow from the feed end to the discharge end to complete the grinding operation.

Ball mill liner The liner of cement dry-type ball mill can be divided into ceramic, granite, rubber, high manganese, magnetic liner and other materials. The function of liner is mainly to protect the cylinder from the direct impact of materials and steel balls and extend the service life. At the same time, the liner plate can also adjust the running track of materials. Generally, the head grinding bin is equipped with hard liner plate, which can enhance the impact force of materials and accelerate grinding. The liner plate of the fine grinding bin is corrugated liner plate or flat liner plate, which can enhance the grinding effect of materials.

Ball mill grinding medium The grinding medium of cement dry ball mill includes steel ball, steel rod, steel pipe, stone, porcelain ball, etc. the steel ball is divided into cast iron, bearing steel, carbon steel and other materials, and the diameter of steel ball varies from 15mm to 125mm. The steel bar is short cylindrical or conical, which has line surface contact with the material and strong grinding effect.

Cement ball mill advantages 1. It has strong adaptability to materials, continuous production and large processing capacity. The equipment has stable performance, is convenient for large-scale production, and meets the needs of large-scale production of modern enterprises. 2. The crushing ratio is large, the feeding size can reach 50 mm, the discharging particle size can be controlled, and the particle quality is good. 3. Cement dry-type ball mill is mainly used for grinding raw materials and clinker (finished products and raw materials) in cement plant, and also for grinding various ores and other grindable materials in metallurgy, chemical industry, electric power and other industrial and mining enterprises. It can be used for open flow grinding and circular flow grinding composed of powder concentrator. 4. The structure is reasonable, firm and can be operated under negative pressure. Cement dry ball mill has good sealing performance, environmental protection, simple maintenance, safe and reliable operation. Disadvantages But at present, the overall efficiency of cement dry-type ball mill grinding is low and energy consumption is large. Although the rolling bearing transmission mode is used now, the cement mill process is still the most power consuming part of the enterprise. Moreover, the cement dry-type ball mill is generally medium and long grinding, with large investment and high cost.

The application of ball mill in cement industry dates back more than 100 years. The ball mill for cement grinding plant is mainly of high fineness, dry grinding method, and the process is mainly of open circuit process and closed circuit process. The equipment of ball mill used in cement plant includes vertical cement mill, roller press and ball mill, etc.

The cement ball mill in cement plant is usually divided into 2-4 silos, the most representative of which are the new type of high fineness cement ball mill and open flow high fineness cement ball mill. There are three cement processing circuits. 1. Open circuit grinding The ball mill in the cement plant for open circuit grinding consists of grinding bin, dust collector and ball mill. Advantages: the cement plant process is the simplest, with less investment and simple operation and maintenance. Disadvantages: serious over grinding in the mill, low efficiency, difficulty in fineness adjustment of finished products, high power consumption.

2. Closed circuit grinding Closed-circuit grinding is widely used in cement mills all over the world. Cement grinding unit is widely used in the United States, Germany, France, Japan and other developed countries. For example, 95% of cement in Japan comes from closed-circuit grinding. The cement plant machinery of closed-circuit grinding consists of feeding system, finished product bin, powder concentrator and dust collection equipment. The process is relatively complete. The disadvantages are a large investment, many equipment and complex operation.

According to many years of practical production experience, JXSC summarizes that cement producers with a production capacity of fewer than 30 tons per hour are suitable for open circuit grinding, and closed-circuit grinding for large-scale production can be more economical.

Matters need attention 1. Cement has corrosion, which affects the service life of steel ball and increases the production cost. 2. Different wear-resistant microelements in different materials of wear-resistant steel balls will be damaged, which will cause poor wear-resistant effect and serious waste of clinker grinding mill. 3. During cement grinding, the material temperature may be higher than 100 , leading to dehydration of most gypsum or complete dehydration, causing coagulate of cement, which requires corresponding cooling measures, including mill ventilation, cylinder water cooling, etc. 4. After each clinker grinding, clean the cement grinding system, so as to avoid inconvenience to the next start-up due to slag material deposition.

Cement mill price Cement ball mill specially used for grinding cement clinker and other materials in building materials, cement production, metallurgical ceramics, electric power and petrochemical industry. JXSC can design and manufacture special cement ball mill equipment according to the output and fineness requirements of users. Contact us for machine selection and a price quotation.

cement mill for sale | buy cement ball mill & vertical roller mill from agico

Cement mills are the milling machines used in cement plants to grind hard clinker into fine cement powders. Cement ball mill and vertical roller mill are two most widely used cement mills in todays cement grinding plants and are also the main types of cement mill we produce.

As a professional cement equipment manufacturer, AGICO has rich experience in the designing and manufacturing of cement ball mills and vertical roller mills. Our cement mills have extraordinary performance in the cement grinding process of the new dry process cement plants.

The cement ball mill is mainly composed of a horizontal cylindrical shell, feeding & discharging hollow shafts, liner plates, and grinding media. The mill body is a long cylinder, with many grinding balls inside. The cylinder is made of steel plate, and the inner part of the cylinder is fixed with steel lining plate; the grinding balls are steel balls with different diameters, which are installed into the cylinder in a certain proportion. There are also ball mills that use steel segments instead of steel balls as grinding media.

There are two chambers in the cement ball mill. When the ball mill is operating, the clinker is fed into the first chamber in the cylinder body through the hollow shaft at the feeding end of the mill. When the cylinder rotates, the grinding balls, under the action of inertia, centrifugal force, and friction force, clings to the lining plate inside the cylinder and rotates with it. When they are brought to a certain height by the lining plate, they will be thrown down due to gravity, and the clinker in the cylinder will be smashed.

After coarse grinding in the first chamber, the clinker enters the second chamber through the single-layer partition board. The second chamber is inlaid with a flat-lining plate and steel balls, which further grind the material into cement powders. The powders are finally discharged through the discharge grate plate, and the cement grinding operation is completed.

Vertical roller mills (VRM) are a type of mainstream clinker grinding equipment in the cement manufacturing process. Vertical roller mills are still newish cement mills since their history in cement production is no more than 20 years, but they have already become the standard cement equipment in many regions and are getting more and more popular among cement producers.

When the vertical mill works, the motor drives the grinding disc to rotate, and the grinding roller rotates around the grinding roller shaft driven by the disc. The material entering from the feeding port falls in the center of the grinding disc and moves towards its edge under the action of centrifugal force. When the material passes through the grinding track, it is meshed between the roller and the disc and crushed by them. After grinding, the material continues to move towards the edge of the disc until it overflows. An air duct ring is installed around the grinding disc, from which the hot air flows out at high speed from bottom to top, and carries the spilled materials. The material with large particles will fall back to the grinding disc, and the material with small particles will be brought into the powder concentrator for coarse and fine classification. The coarse powder falls back to the grinding disc for regrinding, and the fine powder meeting the requirements is sent out as the finished product, which is collected by the dust collector at the upper outlet along with the airflow.

cement mill-rotary kiln,rotary dryer_hongke heavy machinery co.,ltd

A cement ball mill is the equipment used to grind the hard, nodular clinker from the cement kiln into the fine grey powder. Most cement is currently ground in ball mills and also vertical roller mills which are more effective than ball mills. Cement crusher is applied for cement crushing. In cement production line you need to choose suitable raw material mill and cement crusher.

A Ball mill is a horizontal cylinder partly filled with steel balls (or occasionally other shapes) that rotates on its axis, imparting a tumbling and cascading action to the balls. Material fed through the mill is crushed by impact and ground by attrition between the balls. The grinding media are usually made of high-chromium steel. The smaller grades are occasionally cylindrical rather than spherical. There exists a speed of rotation at which the contents of the mill would simply ride over the roof of the mill due to centrifugal action. Ball mills are normally operated at around 75% of critical speed, so a mill with diameter 5 m will turn at around 14 rpm.

The ball mill is usually divided into at least two chambers, (Depends upon feed input size presently mill installed with Roller Press are mostly single chambered), allowing the use of different sizes of grinding media. Large balls are used at the inlet, to crush clinker nodules (which can be over 25 mm in diameter). Ball diameter here is in the range 6080 mm. In a two-chamber mill, the media in the second chamber are typically in the range 1540 mm, although media down to 5 mm are sometimes encountered. As a general rule, the size of media has to match the size of material being ground: large media cant produce the ultra-fine particles required in the finished cement, but small media cant break large clinker particles. Mills with as many as four chambers, allowing a tight segregation of media sizes, were once used, but this is now becoming rare. Alternatives to multi-chamber mills are:

cement ball mill - cement grinding machine - cement mill | agico

The cement ball mill is a kind of cement grinding mill. It is mainly used for grinding the clinker and raw materials of the cement plant, and also for grinding various ores in metallurgical, chemical and electric power enterprises. It has the characteristics of strong adaptability to materials, continuous production, large crushing ratio and easy to adjust the fineness of grinding products. The cement ball mill can be used not only in dry method cement production line but also in wet method cement production line. In addition, it can realize the simultaneous grinding and drying, which is the important equipment for cement grinding. AGICO is one of the leading cement ball mill manufacturers in China. We supply the high quality equipment. If you are interested, please feel free to contact us.

The materials are uniformly fed into the first chamber of the mill by the feeding device through the feeding hollow shaft. There is a stepped or corrugated liner plate and some steel balls of different specifications in the chamber. The cylinder rotates approximately once every couple of seconds, and the centrifugal force produced when the cylinder rotates brings the steel ball to a certain height and then falls down. This kind of impact force will have a grinding effect on the material. After the kibbling in the first chamber, the materials will enter the second chamber through the monolayer partition board, which is inlaid with a flat liner plate and contains steel balls to further grind the materials. After that, the powder will be discharged through the discharge device.

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.