Mining Mirror May 2017 - Page 41

Marketplace Limestone mine orders Osborn plant Rossmin limestone mine has ordered a R27-million crushing and screening plant from Johannesburg-based equipment manufacturer, Osborn. The mine belongs to Umzimkhulu Industrial Holdings and is located close to Port Shepstone on the KwaZulu-Natal South Coast. According to Shane Beattie, product sales manager at Osborn, the new plant features a unique process designed by Osborn to minimise fines generation in the production of calcite and lime. “The plant was designed and installed to only produce two sized products: 80mm+30mm and -30mm+10mm. The -10mm is a by-product,” says Beattie. He reveals that the process is revolutionary in that a conventional crushing plant would be a jaw and cone configuration to crush down to a -80mm product from a run of mine (ROM) of 600mm. “We supplied an Osborn modular 3042 jaw plant feeding into an Osborn modular 2340 jaw plant, then over an Osborn modular 6 × 20 triple deck screen, splitting the product into -80mm+30mm, -30mm+10mm, and -10mm+0mm. The primary reason for the two-stage jaw crushing process is to minimise the generation of fines (-10mm),” Beattie expands, adding that this material cannot be used in the next stage and is a waste product. Beattie says that Osborn’s pioneering process is more effective than the conventional separation process at other plants, where all the ROM material is crushed to -1mm and smaller, and then flotation is used to remove the impurities. “This process requires lots of water and waste that is more difficult to manage.” Umzimkhulu and Rossmin will only process the high-grade material, up to 99% calcite. “By only feeding the high-grade -80mm+30mm to the tertiary/quaternary plant and with the next stage being dry, it will produce a higher yield per ton crushed,” says Beattie. “Since this stage is the most expensive part of the process, by only crushing the desired calcite, the operation will be able to dramatically reduce its cost per ton, and the capacity in this stage is utilised to its fullest potential,” he adds. Are you involved in the South African mining industry? High tensile steel mesh for optimum performance. Blast resistant and corrosion free Tel. +27-11-7943248 • Hydraulic and pneumatic cylinder power to move your world +27 11 892 1517 • Boksburg, RSA Advertise Here Chantalle 073 243 0525 AFRICAN MINES ONLINE Market leaders in conveyor tensioning equipment. 011 970 1920 is the up-to-date online source that instantly unearths essential info on 125 minerals at over 1 100 mining projects in 53 countries. Intelligence to boost your business. For all your drilling needs 014 536 9913/4 A must for anyone doing business with Africa’s mining industry! MAY 2017 MINING MIRROR [39]