The Asia Miner

JUL-SEP 2019

The ASIA Miner - Reporting Important Issues to Mining Companies in the Asia Pacific Region

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Page 47 of 59

the asia miner • volume 16 • issue 3 46 SUPPLIER NEWS Pebble crushing is very topical: as we dig deeper into mines, the ore is geমng harder and ore grades are declining, causing the build-up of pebbles in mills to become a greater concern. If pebbles are not dealt with appropriately, they start to occupy a large part of the mill and reduce its processing capacity. Installing a pebble crusher on site significantly reduces the effects of pebbles build-up and can increase throughput by as much as 25 per cent*. "We now offer pebble crushing soluঞons as part of the overall mill opঞmisaঞon," says Amit Zadoo, Mining Comminuঞon Sales Manager at Weir Minerals. So what are the key features to look for in a crusher? Mr Zadoo lists his top 5 below. 1. Tight closed side seমng (CSS). CSS is a very important crusher parameter, as it defines the maximum product size and has a significant effect on crusher capacity and crusher liner wear. 2. Very high clamp pressure. "We o[en see crushers that cannot sustain a consistent, ঞght CSS over a period of ঞme, for example, over one or two shi[s," says Mr Zadoo. "The crushing force of the pebble crusher has to be very high to hold the seমng conঞnuously for a long period of ঞme to deliver a fine crushed product." 3. Robustness of the crusher, which applies equally to the weight of the machine and its faঞgue life. "Pebble crushing is the toughest of crushing applicaঞons, so the crusher has to be robust," explains Mr Zadoo. "Our Trio TC crushers are typically 40-50% heavier than similarly sized machines in the market and provide a new level of robustness from the faঞgue perspecঞve." 4. Ability to handle variable feed. When a crusher has the capacity to handle variable feed such as that produced in most mill circuits, a surge bin is not required. According to Mr Zadoo, the benefits are significant: "As a result of having a crusher able to handle variable feed, our customers save money that would otherwise go towards a surge bin and feeder arrangement. Being able to dispense without a bin and feeder arrangement also saves space, which is a big plus for sites where space is at a premium." 5. High power. "To crush big rocks, you need large motors. I will conclude my list with the logical requirement of high power for pebble crushing applicaঞons." To sum up, the most important factors in selecঞng a pebble crusher are its ability to operate at ঞght seমngs and to withstand regular and significant tramp events. The smaller the crush size, the more rapidly the pebble load will be reduced; Mr Zadoo recommends using a heavy, robust crusher, such as the Trio® TC series, to achieve higher throughput rates in the milling circuit. * McIvor, R. & Greenwood, B. (1996). Pebble Use and Treatment at Cleveland-Cliffs' Autogenous Mill Operaons. Proceedings of the Internaonal Autogenous and Semiautogenous Grinding Technology, SAG 96 A fleet of Volvo Construcঞon Equipment asphalt compactors, double drum compactors and a tracked sensor paver are improving the quality of roads and life in the city of Bellary, Karnataka, India. There is a simple way to determine the development of a town, city or even a country: Take a good look at its roads. "Tough, smooth roads generate more growth and vibrancy in the economy," says P. Prabhakar Reddy, a public works contractor in the city of Bellary, Karnataka, India. "BeŽer road qualiঞes mean beŽer quality of life and living — that's the boŽom line!" Assisঞng the 30-year roadbuilding veteran on various projects is a fleet of Volvo Construcঞon Equipment (Volvo CE) that includes two DD100 asphalt compactor, four DD90 double drum compactors and a P5320B ABG tracked sensor paver. "Our beginnings were humble, but our abiding passion for road building has ensured steady growth over the years," says Mr Reddy, who is now the leading road building contractor in Karnataka. The fleet has helped Mr Reddy on a string of presঞgious projects including the 344 kilometres NH- 167 highway, which stretches from Hagaribommanahalli in Karnataka to Jadcherla in Telangana. "It's been a long and difficult journey but, at the end of the day, well worth it," he says. "Real saঞsfacঞon in road building comes when you get that near-perfect mat finish across the enঞre project stretch. And that's not easy to achieve." Currently, the Volvo P5320B ABG tracked sensor paver is working on a road that connects to the new terminal at the Kempegowda Internaঞonal Airport in Bengaluru. Mr Reddy says the P5320B ABG tracked sensor paver stands alone in its class in terms of paving quality and hassle-free operaঞons. He is also pleasantly surprised that, even with the sophisঞcated design to boost paving quality, producঞvity, fuel and efficiency, the paver is sঞll easy to operate. "Anyone can operate a Volvo machine with ease — that's the thing," he says. Mr Reddy says Volvo CE machine's ease of operaঞon is a definite advantage in his business where there is constant pressure on both margins and availability of skilled manpower. Choosing the correct pebble crusher for your site Volvo CE fleet builds better future in Bellary, India

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