Engineering & Mining Journal

AUG 2017

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 90 of 99

AUGUST 2017 • E&MJ 89 PROCESSING SOLUTIONS is wear-free and induced by air, allowing the stroke motion (frequency, amplitude and shape) to be adjusted within a wide range of operating parameters. allmineral noted that its energy-saving jigging systems are capable of reliably and effi ciently sorting primary and sec- ondary raw and waste materials of dif- ferent particle density: gravel, coal, ore, slag, sand, rubble and various recycling materials. More than 500 alljig jigging machines have gone into operations worldwide over almost 30 years, accord- ing to the company. Waterless System for Iron Ore Processing An article recently published by a South Australia news service described a water- less ore processor that reportedly can sig- nifi cantly increase iron ore recovery rates and purities. According to the article in The Lead, a device called the Cyclomag has been de- veloped by IMP Technologies (IMPTEC) in South Australia and works in conjunction with the company's Super-Fine Crusher to deliver enhanced iron content with fewer impurities. It utilizes rare earth magnets to pull the magnetic material out of an air- fl ow, while the tailings are separated and collected at the other end of the machine. The Cyclomag is not only waterless but also delivers a product with iron (Fe) content of up to 70% after a single pass, according to its developers. The technology is also being used by a research team from the University of South Australia to study its potential for other ores. Professor Bill Skinner from the university's Future Industries Insti- tute said the effi ciency ratings of the Cy- clomag and Super-Fine Crusher working together ranged from 80%-90% from ore to product. "The grades are high enough that they can go straight to steel produc- tion because of the combination of the crushing and dry separation," he said. "They are as good, if not better than what is currently being produced out of magne- tite projects." Skinner said the process was most benefi cial when used on hard materials such as zircon, black sand and quartz. "It could also be used for sulphide ores, for example copper and gold, where the combination of compression and shear could result in much better liberation at a coarser grind size." The Super-Fine Crusher alters the con- ventional process by removing the need for water and media, crushing minerals from 10 mm down to 10 microns and eliminating the need for reprocessing. The Cyclomag utilizes the benefi ts of the Super-Fine Crusher to liberate and sepa- rate magnetic iron ores during benefi cia- tion. This results in a power reduction of about 20%-40% and limits water use to dust suppression and slurry transport. Magnetite Mines General Manager Gavin England said IMPTEC's machines had the potential to disrupt the commer- cial benefi ciation business. "We live in the driest state of the driest continent in the world and good water is limited," he said. "With magnetite processing and benefi ciation, you need a lot of water so any way to dry separate and dry crush the material is a real bonus. "If we can do the same thing as the demonstration site at a commercial level, it will change the way magnetite is pro- cessed, especially if it's done in a single pass. I don't know another technology that does this." The Cyclomag and Super-Fine Crusher were developed by Chris Kelsey, who is best known for inventing the Kelsey Jig. IMP Technologies' Super-Fine Crusher (top) has been combined with a device called the Cyclomag in a waterless system that reportedly can process iron ore and other ores, outputting a product with higher metal content and fewer impurities (bottom).

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