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Choose & Use Vibratory Screen Separators - · PDF fileHOW TO CHOOSE AND USE VIBRATORY SCREEN SEPARATORS ... This book, “How to Choose and Use Vibratory Screen Separators” as

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  • Ask OrangeTMProvides solutionsto process problems

    How To

    Complete guide toIndustrial Screening Applications

    Its not magic...its ERIEZWorld authority in advanced

    technology for magnetic, vibratoryand metal detection applications.

    Choose & UseVibratoryScreenSeparators

    Choose & UseVibratoryScreenSeparators

    VB-69

  • Ask OrangeTM is a collection of process solutioncase studies and how-to reference manualsdesigned to improve understanding and simplifyspecifying sophisticated magnetic, vibratory andmetal detection equipment needed in most processindustries. Most of this equipment requires anunderstanding of its intended use in order todetermine proper application.

    HOW TO CHOOSE AND USE VIBRATORY SCREEN SEPARATORS

    PageIntroduction 3Defining Equipment Terms 3Circular Vibratory Screeners 4 Syncro-Sizer 4 Syncro-Sieve 5Material & Process Considerations 5Decks & Screens for Circular Vibratory Screeners 6Screen Selection Guide 8Rectangular Vibratory Screeners 10Mechanical Screeners 12Custom Equipment & Applications 14Contact Eriez 15

    The Professor icon has been developed to help customers identify AskOrangeTM material in printed trade publications, company literature and onits web site. The Ask Orange concept and related images are a tribute tothe companys founder, Orange F. Merwin, and his innovative ideas usingmagnets to remove metal contamination from various process flows.

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  • HOW TO CHOOSE AND USE VIBRATORY SCREEN SEPARATORS

    Screen separators are used to remove foreign or other unwanted material from productflows. They can classify dry bulk solids ranging from chunks to fine powders. Screenseparators are used to separate solids and liquids in a variety of applications. Eriezprovides a broad range of screeners for both wet and dry product separation. This book,How to Choose and Use Vibratory Screen Separators as written, is intended to helpusers select the correct vibratory screener for their particular process.

    DEFINING EQUIPMENT TERMS

    Circular Vibratory ScreenersCircular screeners feature a gyratory motion to move wet or dry product down andthrough a series of decks, each with its own screen and with its own discharge spout.Depending on the end product, one, two, three or even four decks can be used to attainthe desired degree of fineness. Generally, the gyratory motion is gentler and is ideal formore fragile product. A variety of mesh screens are available for each deck and to meetyour specific need, decks are available in six sizes. Circular screeners are used forprocessing slurries, waste water, minerals, chemicals and other dry or dewateringapplications. These popular screeners separate and size materials ranging in size from 1/4inch (6mm) to 40 mesh.

    Rectangular Vibratory ScreenersRectangular vibratory screeners are available in a wide variety of sizes and shapes.Recommended screens range from 20 mesh up to 1/2 inch (12mm) size used for scalping.Rectangular vibratory screeners have a totally enclosed patented magnetic drive and canscreen practically any bulk material from micro size to bulky chunks.

    Mechanical ScreenersThese screeners are relatively simple, rugged vibratory machines designed to handle avariety of bulk material. The screener is a tuned two-mass vibrating system excited by amotor driven eccentric weighted shaft. Corrosion resistant rubber springs transmit theexciting force and can fine tune the motion of the trough optimizing the flow rate for aspecific application. Mechanical screeners are available in a wide variety of sizes, shapesand deck types.

    These screeners will covered in more detail later.

    Did you know?The term scalping refers to the removal of large chunks from atypically smaller bulk material. Scalping removes these piecesearly in the process flow to allow finer screening down stream.

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  • CIRCULAR VIBRATORY SCREENERS

    Eriez offers two types of circular vibratory screeners...Syncro-Sizer and Syncro-Sieve. These high capacity gyratory screeners are designed for high viscosity liquid/solid separation, and wet or dry classification. The separators are easy to use when tuningfor specific feed rate, product and separation requirements. Both models are used withcircular screens mounted in decks which can be used singularly or in multiples.

    Syncro-SizerEriez Syncro-Sizer is a gyratory screenseparator designed for high capacity separationby size of dry materials, and for wet separationswhen oversize material constitutes a largepercentage of the feed.

    The Syncro-Sizer separates and sizes materialsfrom 1/4 inch (6mm) to 40 mesh in size.Because of its unique motion, the Syncro-Sizerprovides outstanding accuracy, capacity andoverall efficiency. It is ideal for food, chemical,metallic and nonmetallic mineral, pharmaceuti-cal, abrasive, ceramic, plastic and other processindustries.

    The adjustable frequency of up to 1450 cyclesper minute and a variable horizontal andvertical stroke are ideally suited for stratifyingthe material in seconds and directing it in acontrolled pattern over the screen face and tothe discharge. Adjusting the dual eccentricweights easily controls the flow pattern ofmaterial over the screen and the speed withwhich it is conveyed to the periphery.

    The off-the-shelf motor that can be purchasedanywhere and easily installed, is mounted onthe stationary base of the screener. Motor life isincreased because the motor is isolated from themotion generator.

    CIRCULAR VIBRATORY SCREENERS

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  • CIRCULAR VIBRATORY SCREENERS

    Syncro-SieveEriez Syncro-Sieve is an economical, quality fixed-rate separator. Powered by an off-the-shelf rotarymotor with an adjustable weight system that can bevaried to increase or decrease product retentiontime, the Syncro-Sieve is ideal for processingslurries, wastewater, minerals, chemicals and otherdry or dewatering applications.

    Under normal use, the Syncro-Sieve will provideyears of trouble-free operation.

    Typical Flow Patterns...depending on how theeccentric weights are positioned in your Syncro-Sieve, the flow pattern on the screen deck(s) may bevaried to improve separation. The diagram belowdemonstrates these various patterns. The instructionmanual which accompanies each Eriez Syncro-Sieve describes the method for making theappropriate adjustments.

    MATERIAL & PROCESS CONSIDERATIONS

    As is the case with other types of process equipment, more than one type of screener canaccomplish the same task. Each type of screener mentioned above has certain attributesmaking it the preferred equipment for certain applications.

    In similar applications, circular screeners are slightly more expensive than mechanical orrectangular vibratory screeners. However they tend to be more compact and thorough asthe material is presented repeatedly to the same hole as it circles the screening medium.Circular screeners are limited by their total capacity and particle size being screened.

    Rectangular vibratory screeners can effectively screen many of the same materialstypically run through circular screeners. However these units also perform well in heavy-duty applications. Both rectangular vibratory and mechanical screeners offer greaterscreening surface area enabling them to process higher volumes and larger particle sizes.

    Mechanical screeners are lower cost, simple units that provide effective screening of

    many bulk materials.

    Quickest Exit

    Longest Retention

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  • Circular Screeners - Components

    Circular screeners are available in sixdifferent sizes to meet process applicationsfrom a trickle of material or tons per hour.

    Multiple Decks

    Single or simultaneous multiple separa-tions can be obtained by the use of one,two, three and sometimes four decks.

    Straight Frame Decks

    The straight frame is designed for usewhere normal volumes of material are tobe discharged from the top of the screen.

    Collector Frame Decks

    The trough-type design quickly gets largevolumes of material off the top of thescreen and conveys it to discharge points.

    Deck Interchangeability

    There is complete interchangeabilitybetween decks. You can use straight frameor collector frame decks as needed to suityour particular application.

    Anti-blinding Ball Deck

    If ball decks are needed to prevent screenblinding, they are available. Slider discsare also available.

    Perforated Screen Decks

    Custom-made decks to meet the preciserequirements of special applications can bequickly provided.

    Discharge Spouts

    Depending on the application, one to fourdischarge spouts can be mounted on asingle frame. Each additional spout greatlyincreases capacity of the screener.

    DECKS AND SCREENS FOR CIRCULAR VIBRATORY SCREENERS

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  • Distribution Pan

    When your material needs to be channeledback to the center of the next screen down,a distribution pan is attached to the bottomof the exisiting overhead frame.

    Wet Feed Distribution

    The disttribution for wet processes lets theliquid flow through while the solids aredirected outward in a full circle.

    Covers

    Tight-fitting covers with a gasketedinspection port are available to keepproduct in the unit where it belongs.

    Did you know?Eriez Magnetics maintains the worldsmost complete magnetic and vibratorytesting laboratory. You eliminateguesswork when tests determine whatparticular problems may be involvedwith your products before a separatoris installed in your plant.

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