Two 28 mw gearless mill drive systems gmds are operating in the mines 40 foot sag mills and four 16.5 mw gmds are employed in 26 football mills along with associated control systems. the six abb gearless mill drives have been installed since late last year and are all now in continuous operation abb team at mina de cobre in panama.Get Price
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A gearless mill drive gmd is a major investment for a plant, and a host of processes are dependent on its reliable performance. this makes its potential downtime one of the biggest risks any mining company faces. its also one that can be mitigated and controlled through data and insights.
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The first gearless mill drive gmd with a power of 6.5 mw was installed 1969 in a cement milling process in the cement plant le havre in france. in the first few years, the gmd was only used in the cement industry. the gmd is also known as wrap-around motor or ringmotor. almost 25 years later, the first gmd with 12.0 mw power.
Gearless agsag mills mydirectindustry ... metso qdx4 mill drive .
Siemens, the company that introduced gearless mill drives gmd to mining industry started up its first gmd on a ball mill in norway in 1980. the mill and its drive system are still in service. today, gmds are mainly used for sag mills between 36 and 40 feet 10.7 to 12.2 m and ball mills from 24 to 28 feet 7.3 to 8.5 m.
The reliability of large diameter, high horsepower ball mill is paramount when large production and minimum downtime is required. the 17 ft. x 56 ft. double compartment ball mill at st. lawrence cement company has the first gearless drive built in north america and has the worlds largest hydrodynamic bearings currently built and running.
The gearless mill drive gmd is potentially the most critical bottleneck in the mine production process. each hour of downtime can result in a heavy financial loss. 3 to improve productivity and reaction times in emergency situations, the mining.
Abb was recently contracted to supply gearless mill drive gmd systems for two 38 foot semiautogenous grinding sag mills at the serra azul iron ore mine in brazil. the serra azul mine unit, owned by mmx minerao e metlicos, an ebx group company, is located in the iron quadrangle of minas gerais, next to belo horizonte the heart of .
Gearless mill drive systems to optimize production at minera quadras new copper mine zurich, switzerland, march 9, 2012 abb, the leading power and automation technology group, won an order worth 43 million to deliver three gearless mill drive systems, plus related automation and power infrastructure equipment for a new copper mine to be operated by minera quadra ltd., in sierra gorda .
Gearless ball mill operation. table of contentsstructural design of mill and bearingsstructural design of the bearingoperational resultsmaintenance of gearless drive mill the reliability of large diameter, high horsepower ball mill is paramount when large production and minimum downtime is required the 17 ft x 56 ft double compartment ball mill at st lawrence cement company has the first .
Gearless mill drives are a well established solution for grinding applications in the minerals and mining industries. the paper describes the functionality and technical features of such drive systems as well as their advantages compared to other drive solutions. due to the variable speed operation the grinding process can be optimized for ores with varying grinding properties.
Two 28 mw gearless mill drive systems gmds are operating in the mines 12-metre sag mills and four 16.5 mw gmds are employed in 26 ball mills along with associated control systems. gearless mill drives are the workhorses for grinding operations which are at the heart of any mine.
Detail and exchanged with the mill builder and the civil engineers and allowed itera-tive optimization of the mill systems. the engineering complexities increased because the gearless drive could no longer be de-signed according to the stress principles alone but also incorporated stiffness prin-ciples as well. stiffness criteria should be.
Meanwhile, abbwhich claims to have invented and delivered the first gearless mill drive system in 1969reported that it had, in early 2007, completed a 41-million order for installation and commissioning of four gearless ball mill drive systems at the cerro verde mine expansion project in peru.
Abbs gearless mill drive system improves energy efficiency and provides increased process availability at tecks carmen de andacollo copper mine. baden, switzerland, may 12, 2010 abb, the leading power and automation technology group, announces that it has successfully completed the commissioning of a 13.4 mw gearless mill drive gmd system for the hipogeno project.
Presently the gearless drive is more costly than the complete mechanical portion mill rotating element and accessories supplied by the mill manufacturers and hence the customerconsultant needs to have two parties to deal with from the start of any project. there is an interface between the mill vendor and the gearless motor supplier.
As siemens drive technologies division celebrates 500 years of gearless mill drive operation combined total of installations it is delivering the gearless drive technology for two new mills for the toromocho mine in the peruvian province of yauli. the order comes from minera chinalco per, a subsidiary of aluminum corp of china chinalco.
Viele bersetzte beispielstze mit gearless mill drive deutsch-englisch wrterbuch und suchmaschine fr millionen von deutsch-bersetzungen.
Gearless ball mill drive. gearless mill drives are becoming the drive system of choice on large ag, sag and ball mill installations for new projects and existing mill expansions , abb gearless mill drive system will power world it includes the engineering for two 156 megawatt gmd systems for two 26 feet ball abb gearless mill drive.
Two 28 mw gearless mill drive systems gmds are operating in the companys 40 ft sag mills and four 16.5 mw gmds are employed in 26 football mills along with associated control systems. gearless mill drives are the workhorses for grinding operations which are at the heart of any mine. the six abb gmds at the world-class panama cobre project .
Citeseerx - document details isaac councill, lee giles, pradeep teregowda abstracta cycloconverter-fed gearless mill drive is a drive system that has hardware and software protection functions to protect the equipment in case of abnormal operating conditions, malfunctions or failures. for demanding applications in the mining industry, protections systems need to be reviewed considering .
From 13.-16.10.2010 abb held its fourth global gearless mill drive gmd user meeting. the conference hosted over 150 participants coming from all five continents and took place in las vegasusa from 188.8.131.520 fig..It was the sixth abb gmd user meeting, after three global and two regional events.
Of the six abb gearless mill drives being installed at cobre panam, four will power ball mills and the other two will drive sag mills. importantly, these massive machines are among the largest ever installed in the world and were transported in quartered sections to site for assembly in-situ.
Two 28 mw gearless mill drive systems gmds are operating in the mines 12-metre sag mills and four 16.5 mw gmds are employed in 26 ball mills along with associated control systems.
For the expansion project, which aims to double the mines concentrator milling capacity from 60,000 to 120,000 metric tons per day mtd, abb is supplying two 15-megawatt gearless mill drive systems and two high pressure grinding rolls hpgr with 2 x 2,650-kw drive systems.
In all, two 28-megawatt gearless mill drive systems gmds are in use at the mines 40ft sag mills, and four 16.5mw gmds are employed in 26 football mills. gearless mill drives are the workhorses for grinding operations, which are at the heart of any mine,.
Abstract a cycloconverter-fed gearless mill drive is a drive system that has hardware and software protection functions to protect the equipment in case of abnormal operating conditions, malfunctions or failures. for demanding applications in the mining industry, protections systems need to be reviewed considering special or abnormal operating conditions as well as the need of high system .
Gearless mill drives gmds have been installed on platinum-miner anglo platinums potgietersrust platinum pprust 600 000 tm concentrator.
Mining magazine - latest mining and investment news. abb continues drive contract for cerro verde six years on. in the march quarter of 2012, abb was contracted to supply gearless mill.