Engineering & Mining Journal

OCT 2018

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NORDIC TECHNOLOGY 2018 36 E&MJ • OCTOBER 2018 www.e-mj.com was all about learning to use the technol- ogy, proving that it would work and that there is a market for it. The object was to get these machines into the mines and we have placed several units in mines in Canada and today we have about 47,000 hours on battery-electric equipment." Svedlund and his colleagues are now looking ahead to zero emissions. Hybrid ve- hicles provided a nice stepping stone as far as emissions reduction, but it makes little sense for underground applications. "Die- sel exhaust causes cancer," Svedlund said. "Safety first is popular mining slogan. Can you say 'safety first,' and at the same time place operators in machines that cause cancer? If a hybrid reduces emissions by 30%, does that mean 30% less cancer? Is that acceptable? The answer is 'no,' and that's why we are targeting zero emissions because that's the only safe limit." One of the more important variables for battery-electric equipment develop- ment is energy efficiency. These develop- ers are looking to reduce the energy con- sumption by as much as 80% compared to diesel engines for the same amount of work. In addition to the health and safety benefits, there would also be cost savings associated with ventilation, which on av- erage represents 70% of the electrical costs for underground mining. "If we could get rid of these diesel engines, the potential savings could be enormous," Svedlund said. "Costs related to diesel are buried everywhere — main- tenance, fuel transportation and storage, etc. Transporting electricity underground is easy." Today, battery-powered equipment can beat diesel in every aspect of performance except run time, Svedlund explained. De- pending on site-specific conditions, bat- tery-powered loaders have a 4-hour run time on average in heavy operations. "It typically takes two hours to muck out a face," Svedlund said. "Depending on the haulage, energy consumption can be higher or lower. We can also use regen- erative braking in certain situations like traming down ramp." "Considering the average life for un- derground equipment is seven, if we start tomorrow, it will be seven years before we are all electric," Svedlund said. Svedlund side-stepped questions about the weight of the battery and how it impacts payload nor would he disclose Epiroc's battery supplier. However, just before Euro Mine Expo, Northvolt was breaking ground on Europe's largest lith- ium-ion cell factory in the same town, Skellefteå, Sweden. The company received its environmen- tal permit, which covers both construction and operation, from the Land and Environ- ment Court in Umeå less than six months after the final application was submitted. The permit was issued for the first section of the factory that will be completed in 2020 and produce 8 GWh cell-capacity annually. The full factory will be ready in 2023 and produce at least 32 GWh annu- ally when it reaches full-scale capacity. Since its launch in March 2017, Northvolt said it has entered into industri- al partnerships with ABB, Nemaska Lith- ium, Scania, SECI, Siemens, Skellefteå Kraft and Vestas, as well as been selected by Epiroc as a supplier of battery systems for zero-emissions mining machines. Doofor Launches New Rock Drills Nokia, Finland-based Doofor recent launched its newest rock drill, the DF800. It is in the 25kW power class and it's de- signed to drill up to 127-mm diameter holes in hard rock. The new rock drill has hydraulic cushioning and drill steel ex- tractor functions as standard. It utilises a patented valve system for economical drilling. "Our customers have requested a rock drill in this size class. We designed it using our latest innovations, such as a new piston type and valve. Also, changing of the flushing seals, should now be quicker than ever," says Kalle Kuusento of Doofor rock drills. "We received positive feedback from our customers, who are using the first individual drifters." The rock drill can use T38, T45, T51 and GT60 shank adapters. Jama Celebrates 80 Years of Serving Underground Miners Sweden's Jama Mining Machines was founded by Torbjörn Bask in 1948. Today, it carries on with the tradition of supply- ing rugged, custom equipment for under- ground metal miners. Bask worked for Boliden for many years before he decided to start a mechanical workshop. He made and repaired the legs for jackleg drills. Then the business involved into drill rigs mounted to a cars that could be moved on narrow-gauge rails. Basks Mekaniska AB worked with Ali- mak and other Skelleftea-based companies, creating different types of equipment for the mines in the region. In the mid-1970s, they started to make larger machines, which were comparable to the Atlas Copco ma- chines at the time. They like many others, however, could never master the quality of the drills and they could not compete. Toward the end of the 1970s, the business fell into bankruptcy. Later a young entrepreneur and handful of me- chanical engineers formed Jama Mining Machines and purchased the assets of Basks Mekaniska. Based in Boliden area, Jama began to build equipment based on standard chassis such as service ma- chines with baskets and scalers. A couple of years later, the three large Swedish mining companies, LKAB, Bo- liden and Zinkgruvan, were looking for a solution for scaling equipment. They were having trouble with the equipment, especially with the reliability and safety. Together, those mining companies wrote a set of standardized specifications and contacted three suppliers. Jama purpose- designed concept won the bid. In 1996, Jama began production of the SB800 and they continued to make them for eight years, selling 45 units. To- day's mechanical scaler, the SBU 8000, was launched in 2004 and they have sold 60 of those units. The majority of which were placed in Swedish mines. "Our customers tell us what they want and we make it for them," said Anders Norberg, business development manager for Jama. "Jama's priorities are safety, er- gonomics and productivity, and we believe there is a strong correlation between ergo- The Doofor DF800 drills holes up to 127 mm.

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