Operating variables its effect on ball wearcase study. The two main functions of a mill liner consist in protecting the mill shell against wear and in transmitting. Uniform ball distribution mixed size balls is a must during starting of ball mill after liner replacement. Example ball mill grindingexpert solution the throughput and ef. Mill liners me elecmetal global presence and distribution. Potential coalhandling applications include chutes, hoppers, bunkers, flooring, perforated. Preventive maintenance checklist for ball mills pdf files. What links here related changes upload file special pages permanent link. But challenges can arise when capacity is not optimised causing unnecessary downtime and liner wear leading to the one sound operators do not want to hear the sound of the mills standing still. Unused patterson industries 5 diameter x 6 long ball mill. Use add reply to replyparticipate in a topicdiscussion most frequent. This project is to design and fabricate the mini ball mill that can grind the solid state of various type of materials into nanopowder.
Ball mill liners for mineral beneficiation polycorp has a long, successful heritage in the mining industry, and is recognized as an international supplier of premium mill liners. For ball mill work ribs are cast with the feed head liners to deflect the ball mass and minimize wear on the headliner itself. Liners in materials of stainless steel, ceramic, zirconia, glazed block, nylon, ptfe, foodstandard vibratiory ball mill consists of shelf, underframe, vibration generator, spring, cylinder, motor and so on. As with grinding balls local economics and ultimately operating costs determine the best design and material to use. High low double wave ball mill liners these are a refinement of the wave liner, figure 5 this was applied to cadia hill gold mine through evaluation of their existing wear profile and wear rate, and provided a more consistent wear profile through the liners working life. By continuing to use the site, you agree to the use of cookies. You may choose roll ball mill with liner if there are strict requirements of material test or batch grinding. In many grinding plants mills which have metallic or rubber liners suffer from bolt breakage. Refined through ongoing design improvements, our ball mill liners maximise uptime and service intervals while providing an improved crushing of the ore.
Trelleborg rubber mill liners trelleborg introduced wear resistant rubber to ball mills in the 1920s, with the first installation experiment carried out in the united states in a 4 x 20 ball mill, at the nipissing mine. Ball mill liners from multotec maximise the lifespan and performance of your ball mill, with a selection of rubber and rubber composite liners available. The ball mill, liners and grinding media employed were made from stainless steel. Pmc790 is also good for making ball mill liners, industrial rollers and belts, rubber mechanical parts and for bonding itself or other substrates to metal. There are liner materials of alloyed steel, stainless steel, alumina ceramic corundum, zirconia and high wearresistant polyurethane for buys option. Different materials are used as media, including ceramic balls, flint pebbles and stainless steel balls. Request for feedback for a two chamber cement mill ball charge and. The selection design and application of mill liners for. This material of construction is superior over all else because of its durability and resistance to wear and tear. Grate discharge heads for ball mills are completely assembled in the shop, with grates, clamp bars, pan liners, and center discharge liners in place. Using abrasion index for calculating steel balls and mill.
This hightech material has no shortage of real benefits. Using add reply allows you to attach images or pdf files and provide a more complete input. Liners can be installed in the most safe and effi cient manner, whilst extending the life cycle and producing maximum tons. The original base case sag mill liners comprised of 48 rows of shell liners and radial discharge type with 25 mm grate apertures. An underloaded mill will break coarse ore well, but at the expense of added. Rubber mill liners pioneering rubber mill linings metso. For wet grinding mill, the liner is also subject to water erosion, wet mill liners faster than dry mill liner abrasion. Continuous lifting action to avoid projecting balls onto shell liners. Indeed, as explained previously, at a mill stop, the measurement of ball charge filling degree could be undertaken and will provide the static media charge angle. Your browser doesnt seem to have a pdf viewer, please download the pdf to.
Mill grind out in order to measure the ball load in the mill, the feed to the mill was stopped and it was ground out to a ball charge only. Every vulco mill lining system designed by our highly trained, infield dedicated team throughout the world has taken. A mill is a device that breaks solid materials into smaller pieces by grinding, crushing, or cutting. Tega rubber lining system is the preferred lining system for secondary ball mills.
Pdf this project is to design and fabricate the mini ball mill that can grind the solid state of various type of materials into nanopowder. Rubber and metal cap liners weigh up to 80% less than steel alone and are faster, easier and safer to install. An overloaded mill has reduced coarse ore breakage, as the cascading balls and rock cannot drop far enough, reducing kinetic energy for breakage. The wear of mill liners affects the production performance of the mining mill. Effect of ball and feed particle size distribution on the. A ball mill is one kind of grinding machine, and it is a device in which media balls and solid materials the materials to be ground are placed in a container. Evaluation of abrasive wear measurement devices of mill liners. A comparison of wear rates of ball mill grinding media. Your mill is at the heart of your production process.
Multotec rubcer composite wear linings are manufactured with a steel backing plate suitable for stud welding. Pulpmax composite mill liners are highperformance lightweight mill liners uniquely constructed with a rubber, ceramic matrix, and carefully selected highhardness steel inserts. Ball mill liners on sales quality ball mill liners supplier. As a result, they last longer and your mill availability increases. You will know best if rubber or steel is appropriate or a composite liner rubber in a smaller ball mill is good rod mills have steel cast head liners and steel capped shell lifters and rubber shell plates sag mills have rubber grates and pulp discharge systems. Tega reinforced lifters have an integrated aluminium track to accommodate the fixing clamp. Vulco mill liners key features and benefits vulco wear resistant rubber and metal cap mill liners are versatile, economical and efficient. For a mill liner, the design as well as the liner material are to be considered. The initial set of liners is rarely the final design selected. Design method of ball mill by discrete element method collected. They need to be fed and kept working round the clock.
Design method of ball mill by sumitomo chemical co. Metso rubber mill liners are tailormade and developed in close collaboration with our customers. Ball mills rotate around a horizontal axis, partially filled with the material to be ground plus the grinding medium. Using add reply allows you to attach images or pdf files and provide a more. Three phenomenon of ball mill liner failurehongji group. Mill liners with a stateoftheart technology and engineering, we deliver the widest and deepest product range for grinding in chrome molybdenum steel and high chrome white iron. In 40 tph ball consumption was high, metallurgy of concentrates. Ball mill and beneficiation process files small scale gold mining machine trommel screen for sale buy beneficiation equipment vibrating gold sluice the recovery of placer gold involves processing similar to the processing of most ores.
The monostep is the most common solution for crushing. The extent to which a liner effectively protects the mill, imparts energy and controls the mill charge, impacts on the total ownership costs for plant owners and operators. Shell lifter bars being measured inside mill middle. Contact us today to speak to a multotec representative. The hypothesis is a lifters face angle drive a ball mills grinding. Vulco mill liner with r67 rubber installed in a ball mill bottom. In general, the harder the material fed to a grinding mill, the greater economy achieved using rubber liners.
The cylindrical jar is used as a mill that would rotate the. More production, lower costs mining companies strive to improve equipment uptime in order to. Metso provides grinding mill parts for equipment previously sold under a variety of trade names and has oem parts to fit seamlessly with your existing mill and process. Excel files with your data as well as drawing would be useful. As a result of slurry pooling in the mill, the surface of the charge could unfortunately not be inspected, and the 9. When a part fails, you need to make the right decision to get your plant up and running. One significant advantage from the use of megaliner mill linings is that downtime costs. The diameter of the gibbsite powder was measured using a master sizer 2000 sysmex corporation.
The number of rows of lifter depends upon the diameter and type of the mill. Ball mills normally operate with an approximate ball charge of 30%. Sag mills are the main workhorses in the majority of comminution circuits globally. We are china mill liners suppliers and provide you good quality ball mill liners,cement rubber liner for wet ball mill detailed info for stone different specifications type.
Our technicians come across broken mill bolts at many sites around the world, to the operators of the mills it is an almost normal occurrence, but if you have breaking bolts there is an underlying problem which needs to be fixed. Pdf a comparison of wear rates of ball mill grinding media. Pdf selection and design of mill liners researchgate. Sag and ball mills are generally accepted as the largest power consumers in a mining and. The two main functions of a mill liner consist in protecting the mill shell against wear and in transmitting the energy of the mill motor to the grinding charge to carry out the required size reduction in the most efficient way. Metsos grinding mills, engineered mill liners, and robust trommels ensure the highest availability. Ball mill grinding and beneficiation process pdf files.
Starting a 6kv 3ph 2,200 kw 1,000 rpm slipring motor for a cement ball mill duration. Ball milling pdf crusher mills, cone crusher, jaw crushers. Using add reply allows you to attach images or pdf files and provide a. Options include impact resistant alloy inserts of cast and rolled metals for the most arduous grinding applications, or ceramic and rubber mill discharge designs to prevent grate. Any roll ball mill model can be matched with liner. Pmc790 is suitable for a variety of industrial applications including making concrete stamping pads, mold liners and molds for casting concrete. Ball mill liners in working conditions, by grinding and material impact on itself, rolling, sliding effect, affected by temperature changes, causing the surface material liner wear, which is inevitable. Classifying liners are a kind of ball mill liners whos main role besides providin. Pdf to understand the friction and wear of working mediums in iron ore ball mills, experiments were conducted using the ball cratering. The extended wear life of our liners maximize mill availability, reduce the number of shutdowns and minimize mill downtime.
Details of the experimental conditions are given in table 2. An overview of the selection and design of mill liners was published by powell et al 2006, providing a reference source on mill liners, however no comprehensive technical manual or training is. Hence, optimum selection of the lining material and its design is important for liner life nd proper grinding efficiency. Maintenance checklists for ball mills pdf exodus mining machine.
Autogenous mill liners, rod and ball mill liners, and feed and discharge end liners bowl, concave, and mantle liners for both the coarse and fine crusher chute, bin, and dump pocket liners bar, steel plate, or nihard classifier wear plates crusher spider caps, rim liners, lower hub lin. Summary the ball mill is designed to grind materials by turning the cylindrical shell with grinding medium e. Depending upon available handling facilities, the head or shell can be lined separately in a repair bay, or after assembly of the mill proper in the trunnion bearings. Pinto valley operations have been elevated to worldclass standards. Vulco mill liners help reduce costs per ton of material.
More economical in comparison to steel liners remamill mill liners mill linings made of special rubber when it comes to the processing of mineral raw materials in mills, rubber is increasingly proving its worth as the ideal material for protection against wear. When the machine starts up, the motor drives the vibration generator to. Ball mill liner is to protect the cylinder shell from the direct impact and friction of the grinding media and material, and also can adjust the grinding media motion with different liner form. Under wet sliding conditions, such as encountered in coalhandling equipment, ak steel 409 ni is a more costeffective solution to carbon and abrasion resistant ar steel due to the corrosion component of the wear process. Mill liners, wear measurement, mining, mills, measurement devices, evaluation, quality index. Was generally used for mill liners ag, sag and ball prior to the movement to higher carbon content steels. Modeling and process control article pdf available in cybernetics and information technologies 122 january 2012 with 4,731 reads how we measure reads. We want to create our own design for liner for mill ball and sag but we dont have. Outotec highperformance grinding mills use advanced simulation tools for the best possible process efficiency, mechanical reliability, and maintainability. Browse metsos wide offering of reliable grinding mills. Specification of ball mill liner crusher mills, cone. Complete mill weight cost life costannum liner kg r day r vgrid 145 368 4 192500 lifterbar 119 302 67 315900 total 508400 100mmflatgrid 192 488 85 402300 125mmflatgrid 240 610 665 64300 lifterbar 2 335 192 122300 total 186600 analysis oftheresults after6monthsofmonitoring, itcanbepredictedthat lifterbarsundertheseconditions willlast192dayson. Improving mill availability through visual technology abstract this paper describes the introduction of two unique tools that discard the longstanding notion that it is impossible to assess liner condition without stopping the mill and pulling the feed chute. Trelleborg then went on to patent the first mill linings in 1953 and after thorough tests applied for.
Being the pioneer, metso rubber mill linings are designed and produced based on the worlds largest bank of knowhow and experience. Mill drive is integrally coupled to horizontal parallel shafted helical gear reducer. Decision support models for the maintenance and design of mill. Effects of fins on ball motion in the mill to predict ball mill grinding behavior using the dis. In grate ball mill work there are no discharge head liners. A ball mill, a type of grinder, is a cylindrical device used in grinding or mixing materials like ores, chemicals, ceramic raw materials and paints. Furthermore, the ball mill of a large capacity has been available to a very extensive range of applications in both dry and wet 14. The media balls are wear part,if worn,you can change them. The discharge grates and grate assembly replace these parts. A power based approach for the selection and comparison of ball. Designed for a number of minerals processing applications, they are customisable to fit the specifications of your sag or ball mill.
Ball mill liners from multotec use specially formulated rubber and composite materials to maximise the lifespan and performance of your mill. Pdf friction and wear of liner and grinding ball in iron ore ball mill. Liners protect the outer shell of the mill from wear liners are renewable. This device is ideal if you do not have a mechanical liner handling machine, restricted entry access or. Ag mills, sag mills, ball and pebble mills, and stirred mills to fit your needs. Mill lining solutions metallic mill linings application metallic mill linings are suitable for autogenous mills, semiautogenous mills, ball mills, rod mills and vertimills. The required movement of the mill charge to carry out effi. Rubber wear plates from multotec form part of the processing equipment manufacturers range of wear solutions. This thesis uses the following format to lay out its design, methodology, analysis. Polycorp has installed rubber liners in ball mills up to 24ft7. Because the structure of ball mills is simple and it is easy to operate, and so they are widely used. The megaliner shell liner is now also available for use in ball mill applications. Design of rubber liner e liner, apart from protecting the steel shell of the mill from impact and abrasion. Vulco mill liners help reduce costs per ton of material processed for plant owners and operators.
Grinding mills for mining and minerals processing metso. Ball mill liners mill liners cement mill liners steel mill liners white iron castings wearresistant castings ni hard liners crusher wear parts alloy steel castings heat resistant castings grinding media sag mill liners ball mill lining grinding mill liners mill lining system mill liner design and installation. Optimization of cement grinding operation in ball mills. It is due to these reasons that contamination of the material was ruled out. Vulco compounds are produced for use across ag, sag, ball, rod and scrubber mills. Liners are engineered to promote ideal ball charge motion and to optimise grind. Metallurgical contentoptimize ball mill liner replacementlorain shell linersmill head linersmill liner boltseffect of liner design on mill performance there are many different designs and styles of ball mill liners.
Our extralarge liners provide increased operator safety and minimized mill downtime by making. Our elastomer laboratory experts are continually developing new compounds for improved mill liner performance and wear life. Tega mill linings provide optimal grinding solutions in major mineral processing plants all over the world. Pdf dramatic shortcomings of mill liner designs, especially of large semiautogenous grinding sag millssuch as rapid failure, mill shell damage. A megaliner mill liner is quicker and safer to install than other mill liners because it is bolted into place from the outside of the mill. This liner system was suitable for the low competentfriable feed but did not perform well on the harder skarn and diorite ores, particularly when the power drawn was limited by increasing mill noise at.
Processing recommendations pmc770 industrial liquid rubber compound. Includes 30 hp, 3 phase, 60 hz, 230460 v, 1725 rpm motor. Unused patterson industries 5 diameter x 6 long ball mill, type d, nonjacketed, with ar400 steel liners. History is that mill liners have evolved over time liner design has a significant effect on mill performance and liner life engineering approaches have highlighted mill performance with mill modelling and the use of improved materials liner design,with the advent of large diameter sag mills. Request for feedback for a two chamber cement mill ball charge and longitudinal sieve analysis.