Pit & Quarry, October 2013
SPECIAL SECTION CONVEYING MATERIAL HANDLING Magnet has low maintenance requirements Systems built for high production with capacities up to 3700 tph GreyStone Inc s conveyor systems range in length from 50 to 200 ft The companys conveyor line includes standard and heavy duty portable conveyors radial stackers and tower radial stackers that deliver material flow capacities between 300 and 1300 tph Conveyor belt widths range from 24 to 54 in depending on model In addition GreyStone manufactures overland conveyors that come in lengths up to 2500 ft with belt widths up to 72 in They deliver a maximum material flow capacity of 3700 tph the company says All GreyStone conveyor systems have standard CEMA idlers and a lagged head pulley design with a rubber coated gripping surface that ensures a tighter hold on conveyor belts to minimize slippage A self cleaning wing type tail pulley eliminates debris buildup and allows the belt to run reducing belt damage www greystoneinc com Suspended permanent magnets automatically remove large amounts of ferrous from nonferrous materials conveyed in heavy burden depths on almost any type of conveyor or chute Eriez says With no power source necessary the magnets require no electrical maintenance and offer uninterrupted magnetic protection In addition Eriez says they offer safe reliable tramp iron removal to protect costly processing machinery and maintain product purity Magnets operate at peak efficiency at all times the company adds as temperatures in the 100 to 200 degree range have virtually no effect on the separators Magnets are available in manual cleaning MC and self cleaning SC models Both MC and SC models are offered in five magnetic strengths Options include hazardous duty motors static conducting belts zero speed switches special belts for abrasive hot or difficult applications foundry package options and drawer type strippers for easy cleaning www eriez com Ensures throughput of hard to convey materials The BT Series blow through feeder airlock from ACS Valves is designed to ensure optimal bulk density and throughput of hard to convey materials such as fine powders and flakes that in high pressure pneumatic conveying applications can easily over aerate and reduce material feed efficiency The BT Series feeder airlock design decreases excess aeration of the material during conveying with an integrated vent port on the return side of the valve housing that automatically vents air leakage An eight vane rotary valve design significantly reduces air leakage and maximizes the flow path of air through the rotor pocket www acsvalves com 42 PIT QUARRY October 2013 www pitandquarry com
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