SCREENING TECHNOLOGY
STM-SCREEN™ picks up in stroke as material surges . This consistency of stroke ensures that there is no loss in screening efficiency . Material surges on competitive brute force screens dampen the stroke and diminish screen efficiency .
“ The proven Two-Mass screen technology offers an increase of at least 30 % in throughput compared to the equivalent footprint brute force screen at the same or better efficiency . The STM- SCREEN™ does so while offering significantly reduced screen deck wear , substantially reduced power consumption , quieter operation , and transmits negligible vibration and dynamic load into the plant structure .”
GK says all these features combine to provide increased uptime , longer service intervals , significantly increased throughput , and the lowest cost of ownership available in a vibrating screen package .
Looking at high volume comminution circuits , GK states : “ large brute force banana and horizontal screens are the industry standard for SAG , AG , crusher , and HPGR comminution circuits . However , as the size of these screens expanded to address increasing comminution circuit capacities , inherent limitations to their design and construction became evident . The flaws in the screen design manifested in poorer screening efficiency , diminished screening energy , reduced mechanical reliability , and combinations thereof . It is not uncommon for high-volume , high-value
Another McLanahan giant rotary screen for oil sands
McLanahan recently shipped its second largest Rotary Wet Screen to an oil sands mining customer in Canada . For this project , McLanahan replaced the structural components of the Rotary Wet Screen , providing two drum ends – a feed end & a discharge end – & a screen section made up of eight separate screen panels . The inside diameter is 16 ft , and the screening section measures 48 ft long .
Just the structural portion , without the liners , lifters & plows , weighs nearly 250 t . Once fully assembled on-site , the Rotary Screen will measure approximately 70 ft long & weigh close to 400 t . Not only is it the second largest Rotary Screen , it is also the second largest machine McLanahan has ever built . The largest was a 16 x 60 Rotary Wet Screen for the same customer in 2012 . The screen will process oil sands , a mixture of bitumen , sand & water , but rotary equipment can process everything from aggregates & limestone to phosphates & iron ore . Driven by a gear & pinion that spins the entire unit , the Rotary Screen lifts and drops the material until it is small enough to fall through the screen openings . The reject material discharges out the end of the drum . This Rotary Wet Screen was designed to process 6,000 t / h of oil sands & can handle surges up to 8,000 t / h . Using a combination of hot process water and the drum ’ s rotation , the screen breaks down and separates the bitumen from the sands for further processing . spray heads per screen width .
comminution circuits to operate significantly below their design tonnages due to underperforming brute force vibrating screens . General Kinematics ’ proprietary STM-SCREEN™ operates beyond the finite design limitations of large brute force screens . The STM-SCREEN™ is designed and constructed to process higher tonnages , at circuit
design efficiencies . While the industry has accepted screens lasting less than 18 months , the STM-SCREEN™ is reliable and designed for operations years beyond this threshold . General Kinematics STM-SCREEN™ is the solution mines are seeking to maximise comminution circuit production tonnages , both wet & dry .”