Screen equipment

Screen equipment Muhammadiyah University of SurakartaDelta MutiaraD500122006What is screen ???Screen is one of the tools used in the various chemical industries . Screening is the material separation process based on differences in particle sizeFuntion of screenClassification product for sale ( size of cement product , powder etc )

Prepare product feed (feed) the appropriate size for the next several processes ( as feed in grindring , crushing )

Prevent the entry of minerals that are not perfect in crushing (Primary crushing) or oversize to the next processing, so it can be done again next stage crushing process (secondary crushing).

Prevent entry into surface undersize.

part of screeningoversize : Size is greater than the size of the holes sieve

undersize : The smaller size than the size of the holes sieve

Standard sizeStandard size sieve ( screen ) that could otherwise be used with mesh or mm ( metric ) .

The definition of mesh is the number of holes contained in one square inch ( square inch ) ,

Factors to be considered in the selection screen :capacity ,

speed desired outcome .

Size range ( size range ) ,

material properties : density , fluidity ( flowability ) ,

Elements hazards : flammable , hazardous , dust generated .

dry or wet sieves

Screening is usually done in a dry state for coarse material, can be optimized up to size 10 in (10 mesh). Whereas normally when wet sieving for smooth materials in sizes ranging from 20 up to 35 in size.

Kinds of screenBased on scale used , screening tool divided into 2 types :Sieve used in laboratoryScreen used in industry

Screen ( Shieve ) used in laboratory

NoKind of shievePicture1Hand sieve2Vibrating sieve series / Tyler vibrating sive3Sieve shaker / rotap4Wet and dry sieving

Sieve shaker / rotap

SEE VIDEO Testing is accomplished by stacking a set of sieves of various sizes on top of each other, where the larger-hole sieves are on top and smaller-hole sieves are on bottom, in decreasing order.

Usually basic mesh is 200 mesh

Wet and dry sieving

SEE VIDEO Some tools screening used in factory :

Grizzly

Stationary screen

Vibrating

oscillating

reciprocating

Tromel / Revolving

Grizzlyfor sieving coarse material such as stone , coal , etc.

Frequently used before material is sent to a crusher to remove the smaller particle from the feed to crusher

Can be arranged manualy to size desired

SEE VIDEO 1 . Stationary

Small scale operation

As screening SAND, GRAVEL OR COAL

Usually has slope 45 degrees

Vibrating screenSingle DoubleTriple deck

Vibrating screenThis type of screen have high capacity , with good separation efficiency , which is used for a wide range of particle sizes .

for separating solids contained in oil rough ( dirt crude oil) in a way sifted / shakes in the filter media with a certain measure of mess (according need ) .

Vibrating screenVibrating screen , sieve surface dynamic horizontal with slope 45 degrees and oblique move in frequencies 1000 to 7000 Hz .

As screen 8 mesh own to 100 mesh or finer and have been succesfully in wet screening

SEE VIDEO

Trommel screenused in large -scale industry especially in mining .

Trommels can handle materials from 55 mm to 6 mm , and smaller sizes can be handled in conditions of wet screening .

Trommel may be arrange series, but sometime has different screen size throughout the length

SEE VIDEO

Trommel screenAdvantages price is cheaper than vibrating screen

Disadvantages - cost care , especially in the motor armature and brushes can not produce a uniform product such as the Vibrating . - Need a place / room is relatively large

Oscilating screenOscillating screen , dynamic sieve in frequency lower than vibrating screen (100-400 Hz ) with longer time.

Oscillating typically used to hold a small -sized material yangmengalir free , measuring thin , dusty , and other materials that are difficult to treat. the smaller size of 4mesh .

Reciprocating screenConsists of a reciprocating Screens: Gyratory horizontal moving at the end of the dariscreen bait perpendicular to the aid of a rotating shaft in an irregular manner.

Rotation of the shaft of 1000 rev / min. The twist at the end of the feed materials quickly spread to the entire transverse width of the screen surface.

SEE VIDEO dynamic sieves with swing movement, punch length (20-200 Hz).

Used for the removal of the separation size. This separation is used for : Material is smooth, dry Small size (light) which is about 300 meshREFERENCES

Anonymous. alibaba.com (accessed on 20 October 2013)Distantina, Sperisa. SOLID MATERIAL HANDLING.distantina.staff.uns.ac.id/files/2009/08/2 screen.pdf (accessed on 15 October 2013)Fitr, Hilya & Nanda Dwi Putri. http://www.slideshare.net/hilyafithri/ayakan (accessed on 14 October 2013)Brown, UNIT Operations. 1958.modern asia edition Prabowo, Herjun. TREATMENT OF DUTY MECHANIC "MATERIAL BALANCE IN sifting". , 2009. juveri.files.wordpress.com/2010/03/alat-ayakan.doc (accessed on 15 October 2013)