STACK SIZER TM. Patented Technology. The highest capacity, most efficient, fine wet screening machine in the world

Transcription

1 STACK SIZER TM Patented Technology The highest capacity, most efficient, fine wet screening machine in the world

2 Patented Derrick Stack Sizer The Derrick Stack Sizer has redefined the concept of efficient, fine particle wet screening. Never before has one screening machine had such a high capacity in a minimal amount of floor space. Consisting of up to five individual screen decks positioned one above the other and operating in parallel, the Stack Sizer can be fitted with Derrick s high capacity, long life, urethane screen surfaces. With this unique combination, fine wet screening becomes more practical than ever thought possible. Hundreds of Stack Sizers are currently operating at mineral processing plants worldwide and earning significant returns. Urethane screens High open area, up to 45 percent, for maximum flow capacity Full range of openings down to super fine 75 microns (200 mesh) Unique non-blinding design for optimum performance Long panel life minimizes operating and maintenance costs Super g Motors Screen Decks Feed Box Optional Repulp system Flo-Divider Wash Trough Spray Water Screen Panel Powered by Derrick Super G or Super G2 high frequency vibrating motors One pair of 2.5 hp motors provides a uniform high frequency linear motion throughout the entire width and length of all screen decks Superior oversize conveyance Sealed bearing system eliminates external lubricating system and reduces maintenance Up to five decks stacked one above the other all operating in parallel resulting in high capacity while minimizing floor space requirements Easy access for maintenance and servicing of screen panels Quick panel replacement all panels on one 5-deck machine can be changed in about 30 to 40 minutes Uniform distribution of feed slurry across the entire width of the screen Front cover is easily removed for maintenance and debris removal Various inlet pipe configurations depending upon equipment layout requirements Rubber-lined for long life An optional repulping system is available for applications requiring maximum fines removal from the oversize Provides even and representative feed flow to the Stack Sizer decks to ensure optimal separation efficiency Spray water is directed at rubber-lined repulping troughs located between panels on each screen deck Designed according to process and layout requirements from the first panel is repulped and screened again on the second panel for maximum screening efficiency Equipped with dart valves to isolate flow to one or more distribution points

3 Stack Sizer Case studies improved classification in grinding circuits Derrick Stack Sizer New Feed Ball Mill Circuit Product Pump Increase mill capacity and production rate Reduce power consumption per ton Minimize overgrinding of valuable minerals, improving the performance of downstream processes and increasing grade and/or recovery Concept proven in numerous worldwide mining operations COPPER Four 5-deck Stack Sizers outfitted with 300 micron panels processing 520 t/h, replacing hydrocyclones as the classification device in a closed grinding circuit. Increased plant capacity throughput by 17 % Reduced circulating load from 200% to 100% Lower power consumption per ton Consistent size distribution of undersize product PHOSPHATE Four 5-deck Stack Sizers fitted with 390 micron urethane panels replaced hydrocyclones in a ball mill circuit. Production rate increased 40% to 50% Power consumption per ton decreased by 25% to 30% Circulating load reduced from 325% to less than 100% Improved product quality Replacement of Two Large static screens COAL One 5-deck Stack Sizer providing 100 micron separation on 41 t/h of clean coal spiral discharge replaced two large sieve bends and gave: Reduction in ash content from 20% to less than 10 % which doubled the product value Decreased maintenance costs from replaced sieve bends Reduced wear and maintenance costs of downstream screen bowl centrifuges Replacement of Two Hydraulic classifiers SILICA SAND Replacement of two large hydraulic classifiers with two 5-deck Stack Sizers making a 0.5 mm separation on 240 t/h resulted in: Classification efficiency improved from 70% to over 90% increasing product recovery 87% reduction in process water, decreasing operating cost Accurate control of final product particle size

4 Operation, Features, and benefits Principle of operation 5 - Way Flo-Divider Feed Box Dual Vibrating Motors for Linear Motion Easy Access Between Decks Collection Launder Collection Pans Under Each of 5 Screen Decks The patented Derrick Stack Sizer consists of up to five individual screen decks positioned one above the other and operating in parallel. A custom-engineered single or multiple stage Flo-Divider system representatively splits the feed slurry to each Stack Sizer and then to the decks on each machine. Ample space is provided between each of the screen decks for easy observation during operation and easy access for maintenance and replacement of screen surfaces. Each screen deck has an undersize collection pan which discharges to a launder with a single outlet. Similarly, the oversize from each of the screen decks collects in a single hopper with a common outlet. Features and benefits High capacity saves floor space and installation costs High separation efficiency increases product quality, reduces variability and improves downstream processes Linear motion produces superior screening efficiency and maximum oversize conveyance Low dynamic load minimizes structural requirements Low operating and maintenance costs Easy to service Durable high quality construction

5 Worldwide stack sizer applications Phosphate Installation in Morocco Iron Ore Installation in China Phosphate Installation in Russia Iron Ore Installation in Brazil Aluminum Dross Ferberite Nitrates Silica Sand Bauxite Garnet Phosphates Tantulum/Niobium Chromium Ore Gypsum Platinum Tin Ore Coal Iron Ore Potash Titanium Colombium Kaolin Rare Earth Minerals Tungsten Ore Copper Lead and Zinc Resin Pellets Uranium Feldspar Mineral Sands Scheelite Single Deck Double Deck Triple Deck Four Deck Five Deck 590 Duke Road Buffalo, New York USA Phone: (716) Fax: (716) StackSizer - 9/08 Copyright 2008 Derrick Corporation. / All products indicated by trademark symbols are trademarked and/or registered by Derrick Corporation