Nigeria is rich is solid mineral resources, such as: Kaolin, gypsum, mica, clay, tantalite, iron ore, gemstone, silica sand.
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energy savings of more than 5 %. In mineral processing, milling is a large consumer of …
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When it comes to drive sizes exceeding 3500 kW per individual drive, there are no conventional electromechanical drives with electric motors and helical bevel gears. Gearless drives, like those which are state of the art for the mine hoists implemented in underground mining operations, allow the use of larger drive units and are increasingly ...
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ABB recently won an order worth 44 million US$ to deliver three gearless mill drive systems (GMDs) for a new copper mine to be operated by Kazakhmys PLC (Kazakhmys) in southeastern Kazakhstan. The contract was awarded in the first quarter of 2012. Kazakhmys is the largest copper producer in Kazakhstan and one of the top copper …
DetailsGE's MV drive portfolio can help increase operating efficiency, power quality and …
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Its gearless drive system is equipped with two low-speed synchronous motors with cyclo-converters (installed power of 3.8 MW, motor speed of 63 rpm, rated torque at 576 kNm) and a motor cooling system. Load sharing …
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01. —. MOTIONGearless drives for medium-power belt conveyorsABB's new permanent magnet (PM) motors for me-dium-power gearless conveyor drives (GCDs. reduce production costs and increase competitiveness. A PM motor, combined with gearless technology, also fulfills eco-design requirements, saves energy,
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Outotec has recently been awarded a contract to deliver one of the largest grinding mills in the world. The contract includes the design and manufacture of a Ø 40' x 29' SAG mill. The mill will be driven by a Gearless Motor Drive (GMD) which at 28.0 MW is equal to the largest grinding mill power ever used in the mining industry. The SAG ...
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Gearless Mill Drive Protection Improvements and Its Behavior at Minera ndida Ltda. …
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In 1985, ABB delivered the first GMD for mineral processing at an ore mill at Bougainville, New Guinea. Since then innovation has continued with ... The ABB gearless mill drive (GMD) is the most powerful mill drive system available, combining the highest levels of efficiency, reliability, flexibility and availability. ...
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With this cement installation, it is possible to find the optimum production by changing the following: a) Mill speed from 13.0 rpm to 14.5 rpm (68.4% to 76.31% of critical speed). b) Diaphragm opening (in division head from open to closed position). c) Auxiliary fan blade speed from 50 to 150 rpm. d) Feed of clinker, gypsum and gypsum tailings.
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ventional drive systems serving to utilize the principle of economies of scale. By elimination of various components of the drive train, the maintenance activities and spare parts inventories are reduced. The advantages are culminat - ing in the incomparable availability of the Siemens' gearless drive technology of about 99.5% – as confirmed by
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run by 17 MW gearless drives. At Sierra Gorda project, Chile, a new copper processing plant with a capacity of 110 thousand t/day will use four HPGR Polycom-24/17 and three ball mills (diameter 7.9 m, length 11.34 m, gearless drive 17 MW), and Peru's program of pro-ductivity boosting up to 240 thou t/day envisages using eight
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ABB's Gearless mill drive system is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills.
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The gearless mill drive (GMD) can be considered the workhorse for specific grinding processes found in the mineral processing industries. Therefore, it is of particular importance to ensure that its operation is as rarely interrupted by unplanned downtime as possible, and as close to optimal operating conditions as possible.
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ABB has won an order to provide the electrical equipment, including its new gearless conveyor drives, for Codelco's largest operation in Chile.The contract was awarded by Tenova TAKRAF from Leipzig in December 2012. TAKRAF is the main contracting party for the conveyor system and ABB's partner for development of the gearless conveyor drive …
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I was told in this forum that economic efficiency is one of the major reasons for the ongoing popularity of Tumbling Mills in mineral processing. Concerning my questions I need some insight of experts with practical experience. Looking at SAG mills for instance there are huge differences in CAPEX regarding their different drive systems.
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Ensured Results in Mineral Processing (Gearless Mill Drives) ( en - pdf - Brochure ) Pakistan Emerging Market in Cement and Minerals Industries ( en - pdf - Article ) A Team of Drives - Use of multidrives with active front …
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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 world's largest hydrodynamic bearings currently built and running.
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CURRAX supplies the entire drive chain for conveyor belts in primary and raw material production with Siemens components. Conveyor belt drives are often exposed to extreme conditions, such as long distances, tight spaces and harsh climatic environments, to name just a few. The SIMOTICS FD Motors are designed with exactly these situations in mind.
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process all material, today dual pinion or gearless driven mills are necessary. Furthermore, the mill equipment needed to be adapted to exceed its technical and performance limits. Meanwhile, ... Ring-geared mill drives in mineral processing. Acceleration Evaluation and decision Action Degrees of mill rotation To r que (%) 180 140 100
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More powerful and larger mills, higher ball charges and demanding ambient conditions call for a strong partner for grinding solutions. We help you meet these challenges with our drive systems that come with a long track record in improving performance and extending technical frontiers of all three mineral grinding applications: Gearless mills, ring-geared …
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ABB continuously extends technical and performance frontiers of ring-geared mill drive (RMD) technology to fit your site requirements. We provide optimized mill drive solutions for all types of ring-geared mills: low and high speed, single and dual pinion, with and without a gearbox — all designed for reliable, long life and low maintenance ...
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General Description of the Drive. The SAG Mill Drive is mainly formed by a 11,000 HP. Ring Type Synchronous Motor of double winding, fed by two Three–Phased Cycloconverters. The rotor has salient poles without dumping windings and it consists of 72 poles. The cycloconverters work in the out-of-circulation current mode and they are …
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In future, two gearless mill drives and Sinamics cycloconverters will be used in the new production line with one SAG mill and one ball mill. Thus, one million tons of copper concentrate, 10 000 tons of molybdenum and four million ounces of silver oxide can be mined annually – even at an altitude of around 4600 m above mean sea level.
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This conference was thefourth ABB GMD User Meeting, after the fi rst global event was held in Switzerland in 2007, and after two regional events in Santiago de Chile and Sydney, Australia, both held in 2006. To date ABB has installed or won orders for over 80 gearless mill drive units in 21 countries on fi ve continents.
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The size reduction, crushing and grinding, is one of the main stages in mineral processing, because of energy, material and maintenance costs. Looking at economy of scale, new projects consider the use of big mill grinding circuits, where larger power gearless motor drives with cycloconverters in the range around 20 MW are being applied for ...
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The mill is of the two-compartment type, is 16.5 m long and has a diameter of 4.6 metres. The drive was designed for a speed of 14.6 r.p.m. The reasons prompting the use of a gearless drive were the limited space available, and the difficulties experienced in that factory with large gear units.
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Gearless mill drives are a well established solution for grinding applications in the …
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Build or revamp your mine and mineral processing plant using optimal system solutions, coordinated and seamlessly integrated into fully engineered packages. Our unified, cross-functional, enterprise-wide approach to digital transformation in mining - ABB Ability™ MineOptimize is paving the way from a mine with islands of automation to a fully ...
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The gearless mill drive (GMD) can be considered the workhorse for specific grinding processes found in the mineral processing industries. Therefore, it is of particular importance to ensure that its operation is as rarely interrupted by unplanned downtime as possible, and as close to optimal operating conditions as possible.
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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 Mineração e Metálicos, an EBX Group company, is located in the iron quadrangle of Minas Gerais, next to Belo Horizonte – the heart of ...
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Each SAG primary mill (Boliden-Allis) operates with two 5.000 HP. Ball Mills as secondary grinding stage. The Electric Drive (SIEMENS) consists a 11.000 HP synchronous motor of variable speed. General Description of the Drive. The SAG Mill Drive is mainly formed by a 11,000 HP.
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Getting to know gearless mill drives GMDs are the workhorse of grinding operations …
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pecific energy savings of more than 5 %. In mineral processing, milling. s a large consumer of electrical energy. ABB offers energy efficient drives solutions for all mill configurations with the gearless motor, providing continual ener. y savings through lower specific energy. Electrical power quality compensation ensures greater efficiency ...
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The Siemens drive systems for each of the two overland conveyors comprise two low-speed synchronous motors – each with a total power of 4400 kW – and the associated Sinamics SL150 cycloconverters. This gearless drive solution has a number of advantages over the combination of high speed motor and gearbox drives usually used on conveyor …
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Paper held at SAG Conference 2011 - By S. Gaulocher (ABB), K.S. Stadler (ABB), Th. von Hoff (ABB), R. Veldsman (ABB), A. Fuerst (ABB) and J. Koponen (ABB): Gearless mill drives (GMDs) are the workhorse in the mineral processing industries, more specifically when it comes to grinding crushed ore and cement (in various production stages) in …
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Sofol is a well-known crusher and grinding mill manufacturer that offers equipment and solutions for customers from aggregates, mining and mineral grinding industry.
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