Engineering & Mining Journal

AUG 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

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Page 34 of 107

MINERAL PROCESSING AUGUST 2018 • E&MJ 33 For most size distribution ranges, this will amount to less than 10% of the ini- tial feed weight. A way forward for the flowing film dry gravity separator will be to build a dry pi- lot-plant facility to confirm the dry con- centration concept and generate plant scale design data. The longer production runs will increase the confidence needed for this dry gravity concept. And, with a three-product air classifier in the pilot plant circuit, shorter particle-size ranges, which maximize metal recoveries can also be evaluated. The Technology Readiness Level has reached a point where prototype devel- opment is complete and proof of concept has been demonstrated. The next step will be to fabricate a scaled-up 4-mt/h production model for pilot plants and for commercial operations. The production model will have a pro- cess capacity that is equivalent to spirals or plane tables, with no vibration and with low energy requirements. In this regard, the flowsheet will be similar to the high daily-process-rate iron ore spi- ral plants operating in Northern Quebec. Where a large number of spirals, elimi- nate 95% of the feed in a first pass, and with two cleaning steps produce shipping grade concentrates. For gold ores, dry tabling of the cleaner concentrates will produce a refining grade product for bullion production on-site. A dry gravity separator will require complimentary dry operations that crush, grind, size, convey and upgrade concen- trates. Tailings products will require cold bonding agglomeration methods to avoid wind-borne losses to the environment. These additional operations employ equip- ment that is currently available in the iron ore, industrial minerals and recycling in- dustries. The future should be bright. Wa- ter is a limited resource, but air is not. And the process air will be a catalyst that does not become an environmental hazard. George Rodger is a consultant with Rod- ger Mineral Services. He can be reached at (604) 942-8075. Derrick Linear Motion Machines recovering carbon at 75 microns Increase Gold Recovery, Reduce Costs, Improve Performance & Efficiency, and Equipment Reliability Derrick ® offers solutions for fine screening in gold processing plants that effectively address all of these objectives. Whether your application is cyclone overflow trash duty, tailings carbon safety, in-tank interstage carbon retention, de-gritting, loaded carbon, carbon sizing, carbon dewatering, gravity separation, or carbon column safety, Derrick has a proven solution for you. Derrick screening machines – equipped with long-lasting, patented high performance screen surfaces – offer the highest screen throughput in the smallest available footprint. Contact Derrick today to discover how you can increase efficiency and profits! Patented Derrick Hyperpool ® The recovery for three of the minus 50-mesh placer runs from Kalgoorlie varied between 82.7% and 85.5%.

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