Originally Posted by mohandes

we would like to remove 5% fines smaller than 5mm from iron ore pellets.

feed=180 t/h

max pellet size=16mm

fine below 5mm=5%x180=9 t/h

Would you please inform me which type of media is suitable for this application:

-wirecloth?

-perforated plate?

-round holes?

-rectangular holes?

I would believe vibration plays to major roll including size hole, shape of hole, shape of entry, length of bed, vibration orbital cycle, percent of hole to surrounding structure, slope of vibration surface, amount of degradation allowed, and moisture if any.

Granular Dynamics, Inc. has the tools to model the various noted above. Our DEM code ROCKY is very capable You can contact Dr. Tim Donohue at Tunra for guidance:

Timothy.Donohue@Newcastle.edu.au

ROCKY can give necessary detail on performance with irregular shaped pellets, openings, % passing by size and other attendant details. Dr. Donohue can expand upon the abilities. ■

Originally Posted by mohandes

we would like to remove 5% fines smaller than 5mm from iron ore pellets.

feed=180 t/h

max pellet size=16mm

fine below 5mm=5%x180=9 t/h

Would you please inform me which type of media is suitable for this application:

-wirecloth?

-perforated plate?

-round holes?

-rectangular holes?

Sir,

For screening out only 5% (-)5 mm material a very large vibrating screen is required. A punched plate screen with herringbone opening may work. Better option is to use Mogensen Sizer. The Mogensen sizer is based on the Sizer Principal first developed by Mogensen over 60 years ago and patented... ■

Some points:

1. what type of screen being utilized right now please?

2. width, length (key), inclined, horizontal, hi speed, steep angled? RPM or VPM if known.

3. this cut is hard for all modes of vib screeners and more detail will properly dictate the correct response.

George Baker

MODERATOR

Originally Posted by mohandes

we would like to remove 5% fines smaller than 5mm from iron ore pellets.

feed=180 t/h

max pellet size=16mm

fine below 5mm=5%x180=9 t/h

Would you please inform me which type of media is suitable for this application:

-wirecloth?

-perforated plate?

-round holes?

-rectangular holes?

■

Originally Posted by mohandes

Right now, there isn't any screen in this point.

Best option is Mogensen type screen. I presume that this screening is required for screening out fines for feeding pellets to the next unit operation. A Vibrating screen can be an option but screen size will be large and you will require height for spreader chute at feed end and collecting chutes at discharge. Fired oxide pellets are abrasive and wire mesh screen will need heavy maintenance (If nominal size of pellets is 9 to 16 mm, and only 5% material is to be screened out will 90% efficiency). ■