Engineering & Mining Journal

MAY 2019

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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Page 40 of 83

GRINDING CIRCUITS MAY 2019 • E&MJ 39 Brunner Lay & Mining & Construction Tools American made and Family owned since 1882 Mining & Construction Tools PAVING BREAKERS Mining & Construction Tools Mining & Construction Tools Mining & Construction Tools Mining & Construction Tools DEMOLITION TOOLS ROCK DRILLING Call (800) 872-6899 or visit ROCK DRILLING 1510 N Old Missouri Rd, Springdale AR 72764 ph 479 756-0880 fx 479 756-5366 American Made! Quality, Performance, Value and Reliability, since 1882. components of the plant are the LM 24.2 M (5), with 570 kW of installed mill power, together with the high-efficiency dynamic classifier LSKS 37 M (6), for the main pro- cess step of combined grinding, classifying and drying. The product is separated from the process gas at the process filter (7) and is taken to the nearby bulk wagon-loading station. Reject is taken back to the mill feed by an external reject conveying system (8). The hot gas required for drying is generat- ed by a Loesche LOMA 18 perforated plate burner (10). The mill is sealed against the ambient pressure by a Loesche ZA 12.5 M rotary star feeder (4). Since commissioning and EuroChem's early acceptance of the plant in February 2016, the plant has operated very success- fully. By the end of February 2018, it had produced about 1,059,000 mt of phos- phate meal in about 13,000 operating hours with an availability of more than 94%. The first replacement of the grinding tires — the table segments remained — took place in August 2017, when the mill had handled 680,000 mt in 8,900 operating hours. On that occasion, the wear rate was measured on tires and table segments, adding up to 2.6 g per ton produced. Production data for the first two years of operation clearly show that the mill — and the whole grinding plant — has exceeded expectations. The grinding plant is still operating efficiently after two years of operation, thanks to a diligent maintenance program by EuroChem specialists. The measures Loesche took for wear minimization have proved correct, with the wear components having achieved beyond the targeted one-year lifetime. Loesche is committed to providing EuroChem with the support needed to keep the plant in good condi- tion. Based on frequent audits, Loesche GUS is providing inspection, mainten- ance and repair support, as well as en- suring the timely supply of the necessary spare parts. The performance to date con- firms the reliability of Loesche VRM tech- nology to process significantly harder and more abrasive materials economically. Markus Stapelmann is a sales manager with allmineral in Duisberg, Germany. Dr. Carsten Gerold is head of ore and min- erals technology for Loesche in Düssel- dorf, Germany. Alexey Smirnov represents Loesche in Moscow, Russia. Figure 3—Simplified flow sheet of the Loesche grinding plant.

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