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MATERIALS HANDLING


tons of crushed ore by 2020. To achieve this growth and improve the consistency and reliability of production at the same time, Boliden has invested in a completely new crushing plant with two spindle crushers. In its annual report the company states that this massive investment will ensure “more reliable production planning, lower maintenance costs, better predictability and better profi ts.” “Right now we are getting a good price for what we produce. T at gives us the opportunity to invest. But one big challenge is that we are greatly increasing the area of mining, which also involves high costs. We constantly have to fi ne- tune our mining operations so that we can increase production using our existing equipment. T e new crushing plant will enable us to do that,” says Larsson. Obtaining the permit to expand also placed big demands on the ecological sustainability of the Aitik mine. “We are leading the way


environmentally. T is will allow us to ramp up production. T e measures we have taken range from electric vehicles to energy recovery and ecological compensation areas,” explains Larsson, who stresses that the company is constantly raising its commitment to the environment.


A PLANT TO BE PROUD OF Larsson has a great deal of experience in the industry. He has done everything


Jörgen Larsson, project manager


from operating mining machinery to supervising maintenance and installation. He has supervised the crushing project and been involved in commissioning. “It’s fantastic that we have been able


to invest in a totally new plant, where everything is well-planned and we have plenty of access to the equipment.” He is especially pleased with the completely new feed system. “We originally had inclined apron feeders. T ey were unreliable in every way. T ese


are the fi rst conveyors that are completely horizontal. And they look great!” T e feed system was designed by Metso in the USA, and is a proven design with many systems already in use around the world. Metso adapted the system to suit the particular needs of the Aitik mine. T is work was done in close collaboration with Bosch Rexroth, which supplied four hydraulic Hägglunds CBm motors. One of the reasons why Boliden decided to invest in apron feeders with direct hydraulic drive was frequent problems with gearboxes. Another was curiosity. “We had many gearbox breakdowns


Two motors per feeder were suggested


over the years and wanted to improve availability. T is will be a test of hydraulic technology. I have seen Hägglunds drives in various reference installations around the world, and during my investigations I did not hear of any negative experiences. My visit to the factory in Mellansel was also incredibly interesting. I gained a new understanding of how hydraulic systems work.” In addition to improved availability, Boliden set high demands on the performance of the equipment. Metso then drew up a specifi cation of requirements based on two motors that share the load on each feed unit, with a capacity of 8,000 tons per hour, a variable speed of 0-7.46rpm and a starting torque of around 1,000,000km. T e solution off ered by the Hägglunds specialists at Bosch Rexroth was two CBm


www.engineerlive.com 47


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