STACK SIZER
TM
Patented Technology
The highest capacity, most efficient, fine wet screening machine in the world
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.
Patented derrick Stack Sizer™
Feed Box oPtional rePulP SyStemScreen deckSSuPer g® motorS
urethane ScreenS
Flo-divider™
•High open area, up to 45 percent, formaximum flow capacity
•Fullrangeofopeningsdowntosuperfine75microns (200 mesh)
•Uniquenon-blindingdesignforoptimum performance
•Long panel life minimizes operating andmaintenance costs
•Up to five decks stacked one above theother all operating in parallel resulting in high capacity while minimizing floor space requirements
•Easyaccessformaintenanceandservicingofscreen panels
•Quickpanelreplacement–allpanelsonone5-deckmachinecanbechangedinabout
30to40minutes
•Powered by Derrick Super G or Super G2high frequency vibrating motors
•Onepairof2.5hpmotorsprovidesauniformhigh frequency linear motion throughout the entire width and length of all screen decks
•Superioroversizeconveyance
•Sealed bearing system eliminates externallubricating system and reduces maintenance
•Uniformdistributionoffeedslurryacrosstheentire width of the screen
•Frontcoveriseasilyremovedformaintenanceand debris removal
•Various inlet pipe configurations dependingupon equipment layout requirements
•Rubber-linedforlonglife
•Anoptionalrepulpingsystemisavailableforapplications requiring maximum fines removal from the oversize
•Spray water is directed at rubber-linedrepulping troughs located between panels on each screen deck
•Oversize from the first panel is repulpedand screened again on the second panel for maximum screening efficiency
Wash Trough
Spray Water
Oversize
ScreenPanel
Undersize
•Provides even and representative feed flowto the Stack Sizer decks to ensure optimal separation efficiency
•Designed according to process and layoutrequirements
•Equipped with dart valves to isolate flow toone or more distribution points
• 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
COPPERFour 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
COALOne 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
PHOSPHATEFour 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
SILICA SANDReplacement 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
improved classification in grinding circuits
replacement of two large static screens
replacement of two Hydraulic classifiers
Stack Sizer caSe StudieS
New Feed
Oversize
Undersize
Pump
CircuitProduct
DerrickStack Sizer
Ball Mill
PrinciPle of oPeration
OperatiOn, Features, and beneFits
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.
5 - Way Flo-Divider
Easy AccessBetween Decks
UndersizeCollection Launder
Feed Box
Dual Vibrating Motors for Linear Motion
Undersize CollectionPans Under Eachof 5 Screen Decks
OversizeUndersize
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
WorldWide stack sizer applications
590 Duke Road • Buffalo, New York 14225 USA Phone: (716) 683-9010 • Fax: (716) 683-4991
E-mail: [email protected] • www.derrickcorp.com
StackSizer - 9/08 Copyright ©2008 Derrick Corporation. / All products indicated by trademark symbols are trademarked and/or registered by Derrick Corporation
Single Deck Double Deck Triple Deck Four Deck Five Deck
Aluminum Dross
Bauxite
Chromium Ore
Coal
Colombium
Copper
Feldspar
Phosphate Installation in Morocco
Phosphate Installation in Russia
Iron Ore Installation in China
Iron Ore Installation in Brazil
Ferberite
Garnet
Gypsum
Iron Ore
Kaolin
Lead and Zinc
Mineral Sands
Silica Sand
Tantulum/Niobium
Tin Ore
Titanium
Tungsten Ore
Uranium
Nitrates
Phosphates
Platinum
Potash
Rare Earth Minerals
Resin Pellets
Scheelite
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