Engineering & Mining Journal

DEC 2018

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

Issue link:

Contents of this Issue


Page 57 of 115

FLOTATION 56 E&MJ • DECEMBER 2018 COMPANY PROFILE-PAID ADVERTISEMENT and improves the flotation rate through enhanced bubble-particle interactions." Newcrest reported in the 2018 Investor Day Briefing Book it is considering putting a coarse ore flotation system ahead of its flash float/gravity circuit. Possible advantages in- clude energy efficiency, low operating cost, and a small footprint, the miner reported. At an estimated capital cost of roughly $70 million, the system could possibly con- tribute as much as two to three percentage points to the targeted percentage increase in LOM total gold recovery, helping, along with other improvements, to raise the tar- get LOM gold recovery rate from 72%, as determined by the prefeasibility study, to possibly 79%, the miner reported. The disadvantage is the newness of the technology, Newcrest reported. The idea, one of two reported as possi- ble LOM recovery improvement projects, would be subject to the completion of a feasibility study and attainment of the requisite permits and approvals. Recovering Single Particles Minerals Refining Co. (MRC) reported it is planning to pilot test its Hydrophobic-Hy- drophilic Separation (HHS) system at an American copper mine in the second quar- ter of 2019. The system, originally developed and pilot-plant-proven to capture and dry the smallest coal fines, will be tested at pro- cessing roughly 50 to 100 pounds per hour of ore solids comprised of less than 10 micron particles otherwise destined for the thickener, Stan Suboleski, Ph.D., pres- ident, MRC, said. "After the concentrating plants do multiple flotation steps and give up on the ore that is too fine for flotation, that is the ideal place to put HHS," he said. Currently, MRC is lab-trialing the sys- tem using cleaner-tailings samples from four copper and nickel mines. "Once we are satisfied that HHS works well on all four, we will probably be at the point where we can schedule the pilot test at one of them," Suboleski said. The goal, he said, is to produce a concentrate that is 20% copper. "At that point, it becomes something that refiner- ies would love to have." A 20-t/h commercial HHS system for capturing coal fines is calendared for com- missioning prior to the end of 2019. The technology has reportedly been developed to a point where the miner can recover coal fines that are now being pumped to the impoundment as waste. The product, on average, is of a higher quality than that pro- duced by the plant. The system also enables the miner to "dial" in the water content, usually in the single digits, Suboleski said. Those capabilities suggest the tech could be deployed for similar applica- tions in the hard rock space, he said. "We think on the mineral side it might have a future going after really small particles," Suboleski said. "We've recovered parti- cles down to single micron size, and even smaller than that when we were trying it out on rare earths," he said. "We don't know how fine we can go with this tech- nology, and that is probably going to be pretty important on the metals side." HHS shares characteristics with tradi- tional flotation systems. Instead of being aerated, the slurry is mixed with an oil. Oil molecules simply perform better at grabbing hydrophobic particles, Suboleski said. "It is a matter of contact angle," he said. "We can recover particles that are both larger and smaller than flotation can." The system employs several steps. In the first step, the oil and slurry are mixed mechanically. "We have to mix this stuff Bel-Ray has been solving lubrication problems since 1946 and has provided high tech min- ing lubricants for more than 50 years, often working with OEM's to develop high perfor- mance lubricant specifications for mining and processing machinery. Bel-Ray products have a reputation for being the best in class when it comes to quality performance and innova- tive technology. The demands of current and next generation mining equipment mandates superior lubricants formulated to ensure the best protection and performance. Bel-Ray lubricants meet and exceed the challenge. For nearly twenty years, Bel-Ray's top tier grease type open gear lubricant, Molylube ® SF-100 Semi-Synthetic Open Gear Lubricant has met and exceeded the most demand- ing applications and OEM specifications. Molylube SF100 Semi-Synthetic Open Gear Lubricant has met dragline and electric rope shovel lubrication challenges ranging from -50°C to +50°C ambient temperature from the tar sands of northern Alberta, Canada to the Atacama Desert of Chile. The value and performance of the product have been proven around the world in the most challenging and harshest environments. In the effort of continuous improvement and to meet modern demands of key Mining OEM's, Bel-Ray recently introduced Molylube ® Ultra Open Gear Lubricant, the superla- tive open gear lubricant on today's market. Molylube Ultra Open Gear Lubricant is a com- pound type open gear lubricant that meets or exceeds the performance requirements of all major dragline and electric rope shovel man- ufacturers. With high base oil viscosities, in combination with unsurpassed load carrying and anti-wear capabilities, Molylube Ultra Open Gear Lubricant will reduce or elimi- nate scuffing of heavily loaded gear teeth, is multi-functional and is a priming lubricant for pre-lubing gears. Bel-Ray has also developed Clear Gear Lubricant for large open gears used in the process industries in an effort to expand the influence of its open gear lubricant expertise. Clear Gear utilizes complex fluid technologies to ensure that open gear drives on equipment such as ball mills, kilns and dryers are fully protected by the simplest mode of lubrication, hydrodynamic or full fluid film lubrication. Clear Gear provides full fluid film separation of gear teeth, avoiding metal-to-metal asperity contact. If there is no contact there is no wear! Bel-Ray is in a unique position for being able to provide the full spectrum of lubricants for mining and the process industries includ- ing high performance lubricants, gear oil, open gear lubricants, general purpose and specialty greases, 5% aluminum complex and lithium complex EP greases for mobile equipment, hydraulic oils, wire rope lubricants, heavy duty diesel engine oils and thread compounds. Bel-Ray has a lubricant to meet your every need. Visit to learn more! BEL-RAY ® SETS THE GOLD STANDARD FOR MINING LUBRICATION

Articles in this issue

Links on this page

Archives of this issue

view archives of Engineering & Mining Journal - DEC 2018