Coal Age

FEB 2013

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bauma preview continued converter before they are emitted to the environment. The extremely low levels of particulate matter in the emissions also make exhaust gas filtration (DPF) unnecessary. Abrasion Resistant Plate for Mining Machinery Throughout the world, eXtra Abrasion Resistant (XAR) special structural steels from ThyssenKrupp Steel Europe make the mining, transportation and processing of raw materials easier. Hard rock, fluctuating climatic conditions and extreme loads are no problem for the robust XAR steels. They were developed especially for applications requiring maximum wear resistance. With 30- to 100-mm plate thicknesses, XAR steels offer optimum solutions for all areas of mining equipment. Alloyed with chromium and niobium, they display hardnesses of up to 600 Brinell, guaranteeing optimum wear resistance. Components made from XAR steels last five times longer than conventional structural steel components. XAR steels also meet the highest requirements in terms of quality and processing properties. They are ideal for press braking, bending, welding and cutting. In addition, with thickness tolerances as low as ��0.2 mm, XAR heavy plate can help reduce weight. With the spectrum of grades ranging from XAR 300 to XAR 600, steel solutions can be tailored to requirements: XAR 400 is the most commonly used variant. It is suitable for example for screening and crushing machinery. For components subject to less extreme loads, transfers and chute work, XAR 300 is recommended. This steel combines optimum surface quality with outstanding cost-effectiveness. XA 600 offers the highest wear resistance���for use in haul trucks. For applications in excavating and earth-moving machinery where the going is particularly tough, XAR HT (High Toughness) is the material of choice. Ground Engaging Tools from Spain The Spanish ground-engaging tool manufacturer MTG recently built a new plant located in Monzon. ���What makes this factory so special, besides being equipped with the most innovative technology in melting manufacturing, is the special equipment that allows us to control the steel alloys to an optimum and makes it possible to produce bigger wear parts for mining and heavy construction without the risk of breakage or damage,��� said Raul Rico, industrial operations vice president, MTG. The plant has been specifically oriented to expand the company���s available product range toward larger mining and heavy construction wear parts. MTG will continue to operate its existing plant in Barcelona. The hammerless MTG ProMet II system protects buckets. 40 www.coalage.com During bauma, the company will display its new MTG ProMet II, which has one single upper base instead of two, allocating more wear material in the front part of the shroud and increasing its wear life, improving penetration, and extending the bucket life. Each new ProMet II size is available in three formats for the bucket lip: central, left and right, with specific angles designed to cover the needs of the main markets. However, new designs and references might be developed in the future to cover other markets��� specific needs. The company has also developed an iPad app for selecting wear parts. In 2012, MTG successfully published and tested a trial version (1.0) of the app, which has since reached more than 150 app downloads from 32 countries, and more than 8,000 file downloads. MTG will launch the new version (2.0) at bauma, which the company claims will be more interactive and better organized with a wizard tool to help users configure their buckets with MTG���s teeth and adapters. Aker Wirth Develops New Tunnel Boring System for Mine Development Working with Rio Tinto, Aker Wirth has developed a new, innovative tunnel boring system for underground tunneling and mining��� the Mobile Tunnel Miner 6 (MTM 6). The machine concept combines the flexibility of a roadheader with the robustness of a tunnel boring machine. The knowledge gained from a previous version developed by Aker Wirth and tested by Chilean copper miner Codelco was used to make further improvements to the system. The self-propelled machine moves on a crawler and a walking mechanism and excavates rock with six powerful hydraulically actuated arms fitted with disc cutters. The muck is conveyed to the rear of the machine by a loading apron with loading disks and via a chain conveyor where it is loaded. This new tunneling system is part of Rio Tinto���s Mine of the Future program and will be tested this year in a full-scale trial at the Rio Tinto Northparkes copper mine in Australia. The machine should set new standards for mine development. When compared with conventional drill and blast operations, the MTM 6 is designed to more than double current performance with a potential advance rate of 10 m/d. With undercutting technology, the MTM 6 is especially efficient with tunneling in hard rock (up to max. 300 MPa). The considerably lower tensile strength of the rock when compared to compressive strength is exploited in this respect. The roller cutters are positioned at a slight angle to the cutter arms, thus undercutting the rock and removing pieces about the size of the palm of a hand. The energy required for undercutting is about half that used for conventional disc cutters on traditional tunnel boring machines. The MTM 6 combines a roadheader with a tunnel biring machine. February 2013

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