Engineering and Mining Journal - Whether the market is copper, gold, nickel, iron ore, lead/zinc, PGM, diamonds or other commodities, E&MJ takes the lead in projecting trends, following development and reporting on the most efficient operating pr
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BAUMA PREVIEW 2013 machine in order to ensure the high hourly output rate of more than 600 mt/h. The machines run in two shifts around the clock, seven days a week, so after-sales service is extremely important. "The reliable support from Wirtgen Australia was a major deciding factor," said Fitzpatrick. A Mill with No Balls Milling technology developed in Chile will be unveiled at bauma for the first time. The developers believe the Micro Impact Mill possesses the necessary attributes to revolutionize ore crushing. Traditionally, mills grind ore in a wet process with iron balls in a rotating cylinder. The operating costs of these huge, heavy machines and their energy consumption are enormous. In addition to energy consumption, the balls and the grinding cylinder wear. The MIM uses an autogenous process, where the material pulverizes itself. Current measurements with comparable machine sizes show saving potentials of up to 80%, and the output of the ore-bearing rock is higher with the MIM than the cumulative value of a breaker plus ball mill. The system can be operated as a wet or dry process. The unit has two sheaves that function as an accelerator and bluff body for the ore to be ground. Adjustable rotation options of the driven sheaves generate very high relative velocities of the rock with the help of special driving pin elements. Rock enters the machine through a feed hopper. Through an opening in the fixed sheave, the material enters the intermediate area and the driving sheave accelerates the rock material. Driving pin elements are integrated in the geometry of the sheave that bring the fed-in ore-bearing rock into radial speed. With the acceleration energy taken up, the rock collides for highly efficient pulverization of the mill material. The driving pin elements on the sheaves ensure the high velocities in radial as well as axial direction, so that then the generated powder is pressed out of the intermediate area and it passes the machine via an outlet hopper as a fine powder. The grain size is mostly determined by the distance of the two sheaves. The smaller the distance, the finer the grain size. By adding some water, the work process in the mill can be further shortened. The operators thus have several setting parameters for required grain sizes—and all of this occurs with not dust exposure. 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, according to ThyssenKrupp. Rema Improves Transfer Points Rema Tip Top will be on hand displaying its line of products and services that improve conveyor operations. The company's Remaslide LF, a low-friction, slider bed bar, supports conveyor belts at transfer points. The polyethylene coating has been improved not only to reduce friction, but also to resist wear. The company will also display its Remagrip CK-X pulley lagging. Both the 20-mm CK-X HD and the 25-mm CK-X HDX will be on display at the Rema stand. 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. Deep 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 The coating on the Remaslide reduces friction. McLanahan Will Be There For years, McLanahan Corp. has been a well-known and respected name in North America's mineral processing industries. In 2012, they opened their first office in Europe where they have continued to grow and expand their operation there. This year, the company will be exhibiting for the first time at bauma 2013. Visitors will see McLanahan's full line of crushing, washing, classifying, dewatering, feeding, screening and scrubbing products represented with 3-D models. Additionally, sales and engineering staffs from both the European and North American offices will be on hand to answer questions. Radar-based Monitoring Systems The Micro Impact Mill, new milling technology developed in Chile, will be displayed for the first time at bauma 2013. 54 E&MJ; • MARCH 2013 Orlaco will present some safety options for mining, where continuous vibrations and temperature fluctuations are common. The company's radar system, RadarEye, gives the haul truck driver an active warning. It sounds an audible alarm, automatically activates the monitor and selects the corwww.e-mj.com