The evolution of hpgr technology hrc hpgr high pressure grinding rolls are preferred for their energy efficiency and flexibility in ore processing. These test samples were ground using jaw and cone crushers to provide feed for. Grinding largescale rounded parts however, requires specific grinding facilities. Vfd control methodologies in high pressure grinding drive systems by.
Industrial solutions for the minerals and mining industry. High pressure grinding roll hpgr, which has been successfully used to minimize energy consumption in the cement industry since 1985, has now gained popularity for its. Base metal plant with high pressure grinding rolls hpgr. A proposal of the nip zone angle determination in highpressure grinding rolls hpgr crushing process is presented in the paper. Optimise your results with a high pressure grinding roll designed to crush fine particles and be ultra energy efficient. Multiplepass high pressure grinding rolls circuits m. Material from high pressure grinding material from high pressure grinding more fine product due. High pressure grinding rolls hpgr small version used in mining plant model. Hpgr or highpressure grinding rolls have made broad advances into nonferrous metal mining. In addition to the industryleading equipment that takraf already offers to the mining industry, the takraf hpgr is a benchmark in further developed comminution technology. While the rolls are very wear resistant and will tolerate some incidental contact such as when roll adjustments are made, running the rolls together with pressure.
Sgs comminution experts have developed a simple testing methodology to avoid some of the difficulties associated with using hpgr. Sampling surveys were performed around the circuits followed by the determination of the size distribution of the samples down to 1. The hpgr high pressure grinding rolls rollers is the core equipment of the high pressure grinding process the machine reduces particles by compressing and crushing the feed between two counter rotating parallel rollers with a small gap between them this forces the rocks against each other and compresses the feeds density to 80 of its. Hpgrs are characterised by high material throughput rates with low operational. With all external parts made of steel or ductile iron with suitable seals for abrasive dust environment.
Jktech laboratory services hpgr high pressure grinding rolls high pressure grinding rolls hpgr are increasingly becoming a part of hard rock processing due to their energy efficiency, ability to induce microcracks and preferential liberation, coupled with high throughput and high reduction ratio. Koppern specialists in highpressure comminution 7 improved costefficiency highpressure grinding roll presses hpgrs are emerging as an important comminution technology in the minerals processing industry. As an integral part of a modern roll maintenance program, roll grinding and balancing uses machinery with accurate inspection and measurement equipment. Dec 29, 2012 for more mineral processing videos visit my youtube channel. The pressure between the rolls can be lower for grinding granulated slag, raw material or for special applications, such as. With over 170 units sold citic hic has the experience in supplied world class hpgrs to the industry. Work index determination for high pressure grinding rolls. Brent jones application engineer tmeic corporation roanoke, va, usa abstract high pressure grinding roll hpgr technology is a reliable workhorse in the cement industry. The grinding process has been further optimized by introdu cing the v separator which makes a major contribution towards stable operation and greater ope rating security. High pressure grinding roller press for cement mill. Pdf a time dynamic model of a high pressure grinding. Modeling the comminution of cement clinker in high. Metsos unique take on this technology, the hrc hpgr, delivers even bigger as the most advanced high pressure grinding roll on the market.
This paper provides practical tips on roll inspections, balancing, grinding and grooving. Table high pressure grinding roll hpgr sales volume, price, operating cost, operating profits, revenue m usd and profits margin of sgs s. Burchardt, chief technologist mineral mining and processing industry increasingly focuses on efficient grinding systems in recent years worldwide. Hpgr or high pressure grinding rolls have made broad advances into nonferrous metal mining. Material operating hours iron ore pellet feed up to 60,000 h hard rock applications up to 20,000 h lifetime hours actually achieved by polycom roll surfaces 6 polycom high pressure grinding roll 7. Three types of minerals were used as test specimens namely. Polycom highpressure grinding roll the proven, energysaving grinding system. High pressure grinding rolls is a modern technology that is proven to reduce the operating costs in full scale plants when compared with other milling technologies, especially with low grades ores and inherent low efficiency of the conventional comminution system abouzeid and fuerstenau, 2009. The design of the torque limiter shall be such that when torque exceeds a preset value the balls will leave their seats and roll free to provide complete disengagement of the driving and driven components. The atwal is equipped with smooth solid tyres made of nihard iv. The required comminution pressure is transmitted via the floating roll. Patzelt polysius ag, beckum, germany high pressure grinding technology has gained further interest in various industries. Industrial solutions polycom highpressure grinding roll.
High pressure grinding rollsapplications for the platinum industry j. Download high pressure grinding rolls citic hic book pdf free download link or read online here in pdf. High pressure grinding roll for advanced crushing flsmidth. Highpressure grinding is the optimal process for removing scale, cracks and other surface defects. High pressure grinding roll crusher mills, cone crusher.
Hrc high pressure grinding rolls hpgr brochure metso. A preliminary model of high pressure roll grinding using. When the grinding roller and grinding ring reach a certain degree of. The technologys working principle is that two counterrotating grinding rolls expose a column of material to high pressure, which is distributed across the gap between the rolls. High pressure grinding rolls hpgr are being installed in a rapidly growing number of hard rock mineral processing operations.
Pdf determination of the nip zone angle in highpressure. Outstanding results are obtained with the highpressure grinding roll for the comminution of brittle minerals. High pressure grinding rolls citic hic pdf book manual. High pressure grinding roller press hpgr the first pilot high pressure grinding roll available in north america high pressure grinding rollsapplications for the platinum high pressure grinding rollsapplications for the platinum industry 83 introduction high pressure grinding roll technology has become a standard processing step. They compress the feed material between two rotating rollers, one of which is in a fixed position and another roller that is floating. A pilotscale examination of a novel high pressure grinding roll. This shall include all components, instruments and ancillary equipment, including all minor items not specifically referred to, but essential for the safe and satisfactory installation, testing, commissioning. Grinding mills crushers high pressure grinding rolls. The outcome of the trials may determine whether a second vsi or hpgr are fitted as part of any future expansion to the plant. Real and potential metallurgical benefits of high pressure.
High pressure grinding rolls hpgr are used for size reduction or rocks and ores. How does a high pressure grinding rolls hpgr works. The two rotating rollers generate such a high pressure that it grinds the feed material to the desired smaller grain size. Effect of high pressure grinding rolls on comminution. The main grinding action is a result of interparticle crushing. So far in the mining industry, machines are in operation in diamond mines and iron ore applications. They studied the effect of hpgr operating parameters and developed fundamental models to simulate high pressure breakage phenomena. Abstract this study compares the energy consumption of high pressure grinding rolls with the laboratory rod milling tests and the pilot plant. Powell university of queensland, jkmrc, qld introduction, background and objectives high pressure grinding rolls hpgr are widely considered to be more energy efficient devices for comminuting rock than tumbling mills such as sag mills. In this study, the performance evaluation studies in five cement grinding circuits, in which hpgr is used in various configurations, were presented. Industrial solutions polycom gh i h esuser pr grinding roll.
The technology has found its key application in the liberation of diamonds and also in primary comminution. Hpgr technology is a qualified alternative for largescale comminution circuits and is becoming ever more popular in minerals processing. Enduron high pressure grinding rolls high pressure grinding rolls hpgr consist of two rolls of identical dimension, that rotate against each other at the same circumferential speed. Knowledge of the nip zone angle value makes it possible to.
The required comminution pressure is transmitted by a hydraulic system via the floating roll. The top countries of supplier is china, from which the percentage of high pressure grinding roll supply is 99% respectively. A wide variety of high pressure grinding roll options are available to you, there are 296 suppliers who sells high pressure grinding roll on, mainly located in asia. Up to 2030% reduced energy consumption energy efficiency is key to running a profitable operation, so saving 20 to 30% could pay huge dividends. The high pressure interparticle comminution produces compacted cakes of material. One roll is designed as a fixed roll and the other one as a floating roll. This forces the rocks against each other and compresses the feeds density to 80% of its solid volume, exceeding its. Pdf high pressure grinding rolls scaleup and experiences.
Modeling and energybased model predictive control of high. Read online high pressure grinding rolls citic hic book pdf free download link book now. The grinding elements of the high pressure grinding roll are two counterrotating rolls, between which the material is crushed. How to hit the ball then the turf with your irons magic drill duration. As a basic material for the construction industry, cement is next to sand and water the worlds most demanded raw material. Working principle of high pressure grinding roll the grinding roll is composed of two extruding rollers, one is fixed roll and the other is movable roll. When the machine works, the grinding roller, under the action of high pressure spring and centrifugal force, rolls close up to grinding ring, its rolling pressure is 1. Six us coals and a crystalline quartz were tested in an instrumented laboratory high pressure grinding rolls machine equipped with 100mmdiam. All books are in clear copy here, and all files are secure so dont worry about it. Since their introduction, hpgrs have been widely used in cement industry. Through historical cooperation with khd in the manufacture of high pressure grinding rolls hpgr citic hic now designs and manufactures a full range of hpgrs to suit the cement and mineral processing industries. Degerstedt benefits of using high pressure grinding rolls at. High pressure grinding rolls hpgr hpgrs are modern and efficient comminution machines, which are becoming more and more popular in mineral processing. The use of these technologies has enabled a narrow, transportable preconcentration plant to be produced which can.
Cement plant in 2015 pdf roll press presentation hydraulik grinding technologies roller press high pressure grinding rolls main features first appliion 1984 today worldwide more than 600 mills in operation 1 to 1 5 times higher than ball mill 1 4 times higher than vertical roller mill cement finish grinding limited by psd. High pressure grinding rolls hpgr are seen as an energyefficient alternative but their developments in modeling and control have received relatively little attention. High pressure grinding is achieved by an advanced type of grinding roll. The minasrio project that is being implemented by anglo ferrous brazil, foresees the use of hpgr high pressure grinding rolls to grind the undersize from screening at 25. Machines generally have extremely high driving power, between 50 and 630 kw. Since the polycom was introduced onto the market in1985 by krupp polysius, over 200 have been sold. About 100 kg of material are needed for one test run.
Hpgr high pressure grinding rolls rollers for cement. Contrary to conventional crushing rolls, the particles are bro. Design, manufacture, supply and delivery of the hpgr. Guaranteed features of forged steel rolls for hotrolling mills high wearresistance slight tendency towards heat checking high resistance to surface spalling, especially under conditions of high and unevenly distributed pressure on the roll barrel surface. Pdf high pressure grinding rolls hpgrs presently are seen as a standard technology to be considered in feasibility studies, as an alternative to. The material is continuously brought into the roll by the extrusion roller, and after being subjected to high pressure, the. Crushing processes taking place in highpressure grinding rolls devices hpgr are currently one of the most efficient methods of hard ore size reduction in.
High pressure grinding is the optimal process for removing scale, cracks and other surface defects. Enduron high pressure grinding rolls enduron high pressure grinding rolls high pressure grinding rolls hpgr consist of two rolls of identical dimension, that rotate against each other at the same circumferential speed. Universal joints were fully flexible on the original model to show the offset of the rolls and their crushing movement. The grinding elements are two counterrotating rolls, between which the material is crushed. High pressure grinding rolls hpgr technology is accepted as an. Consistent grinding and balancing of rolls is necessary for efficient operation and optimum paper quality. High pressure grinding rolls are being used with great success in all parts of the world for grinding x cement raw materials, x cement clinker, x granulated blast furnace slag, x coal, x ores and x other minerals. High pressure grinding rolls hpgr is a mature technology that is proven to reduce capital and operating costs in full scale plants when compared to other comminution technologies. This type of domain knowledge is captured in the format of several rulebased models constructed on a basis of some auxiliary data sets. The wear parts within our high pressure grinding roll are longlasting, but also very easy to replace when they do wear down. Csp high pressure grinding rolls hpgr csp is a leading worldwide supplier of hpgr rolls to oem and aftermarket. With numerous polycom installations in different industrial sectors, thyssenkrupp industrial solutions is the worldwide market leader for this technology. Hpgr mining rolls crusher 3d cad model library grabcad. In this work a model and a control scheme for hpgr is presented that considers the total energy consumed as one of the main controlled variable.
Effect of high pressure grinding rolls on comminution circuit. The technology is now widely viewed as a primary milling alternative, and there arc a number of large installations commissioned in recent years. World high pressure grinding roll hpgr market research. High pressure grinding rolls hpgr applications in the. Enduron hpgr high pressure grinding roll first choice. Aug 15, 2016 how to hit the ball then the turf with your irons magic drill duration. The use of high pressure grinding rolls is gaining significant interest as a replacement for sag milling in the. Attempts at improving the comminution machines generally have been directed towards increasing the performance efficiency, particularly increasing throughput rate and decreasing energy consumption.
Most new greenfield projects include hpgrs as part of their. The torque limiter shall be totally enclosed and suitable for indooroutdoor dust tight applications. The weir group plc and khd humboldt wedag international. Effect of high pressure grinding rolls on comminution circuit designs. Comparison of one and two stage high pressure rolls. We have many successful working applications having supplied hundreds of sets of hpgr rolls to a variety of worldwide mining and mineral processing operations including iron ore, diamond, molybdenum, gold and copper. High pressure grinding rolls hpgrs have struggled for acceptance into the hardrock mining sector critical hpgr parameters. Morrison project british columbia, canada for pacific. High pressure grinding proven technology high pressure grinding has become the go to technology for size reduction in mineral applications with more than 200 high pressure grinding roll hpgr installations across the world. Comparison of one and two stage high pressure rolls grinding followed by ball milling with conventional rod and ball milling benner, blair r university of minnesota duluth, 1999 view download file. High pressure grinding rolls, also called roller presses, have been used in mineral processing plants for many years, in the treatment of iron ore, copper, gold, diamond and various other ore types. Pdf technological issues of highpressure grinding rolls operation. The gekko gravity recovery system runs in closed circuit with the vsi and consists of.
A time dynamic model of a high pressure grinding rolls crusher article pdf available in minerals engineering 2. High pressure grinding rollsapplications for the platinum. High pressure grinding rolls or vertical shaft impactors in combination with the inline pressure jig and flash flotation to continuously liberate and recover the valuable minerals. Using the functional format of selection function, three additional parameters. After these developments, an hpgr based circuit configuration would often be the base case for certain ore types, such as very hard, abrasive ores.
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