Re: Handling Iron Ore Pellets
Dear Josue,
Is this the downhill system designed by MGS and CDI just outside Belo Horizonte?
I will be in Sao Paulo this Saturday visiting Carlos Hirata and Rui Camara of MGS. Please address you details to them and I will answer. First, we need information on the pellet configuration with shapes and sizes.
My first impression is it will not work, if the pellet configuration is round.
Lawrence Nordell
Conveyor Dynamics, Inc. ■
Re: Handling Iron Ore Pellets
Dear Nordell,
This is the VGR-TFA handling system, to be used also for pellets.
The pellet configuration is round and the sizes are expected to be 90% + 9 mm -16 mm, 5% (maximum) -5 mm.
Regards,
Josue. ■
Re: Handling Iron Ore Pellets
Dear Josue F. Reis,
We normally prefer 12 deg. inclination for your type of application, however iron ore conveying sytem can go upto 14 deg. Repose angle around 37 - 38 deg. & surcharge angle would be 20 deg. ■
Pellets In Inclined Conveyor
Dear all,
We too limit the slope to 12 deg, however in our Tripper the inclination is more than 13 Deg. We do not face any problem of rolling back of pellets, when belt is loaded.
Pellets roll back when the belt is carrying very less cargo or almost empty and that will happen at lesser slope also.
I cannot comment for down hill conveyors, as we do not have it in our plant.
Regards ■
Re: Handling Iron Ore Pellets
Dear Mr. Josue F. Reis,
I have not given serious thought to your specific issue, however I bring following points to your notice:
1) Conveyor declination adversely affects the material stability during deceleration (stoppage). So, more gradual stoppage will tend to reduce the problem. If declination is already very high for specific material, then it will not signify remedy.
2) When the bucket wheel is reclaiming with maximum declination of boom, the material will be loaded on to the belt, which is moving up at 13.5 degree. This will create difficulty in material acceleration (for material like pellet). For this type of situation, concave profile boom, with about 8 degree inclination at loading point and more degree thereafter is solution.
Regards,
Ishwar G Mulani.
Author of Book : Engineering Science and Application Design for Belt Conveyors.
Advisor / Consultant for Bulk Material Handling System & Issues.
Email : parimul@pn2.vsnl.net.in
Tel.: 0091 (0)20 25882916 ■
Handling iron ore pellets
We have an iron ore handling system designed to reclaim and convey up to 6100 tph of lump ore, sinter feed and pellet feed between the stockyard and the train loadout facility. The system main equipments are the 8400 tph bucket wheel reclaimer, a 240 m3 bin, an apron feeder and a 6100 tph 3.6 km two flight downhill belt conveyor. We intend to use the same system to convey up to 5600 tph of iron ore pellets (+9 mm -16 mm grain size, 2,2 t/m3 apparent density), but we have some concerns about the existing slope angles:
1) The BWR boom belt conveyor is +13.5 degrees inclined when the boom is in the lowest position. Will it work properly with pellets? Other characteristics of the boom belt conveyor: belt width 1600 mm; conveyor length 44 m; belt speed 3.7 mps; 45 degree trough carrying idlers.
2) The longest belt conveyor of the system has a 600 m -14.2 degree declined head end section. Will the material remain over the belt in all operational situations (starting, stopping or running at full or reduced load)? Other characteristics of the belt conveyor: belt width 1200 mm; overall length 2.5 km; elevation -200 m; belt speed 1.4 up to 6 mps (VFD motors); 45 degree trough carrying idlers; 39 s operational stopping time, 24 s emergency braking time. It feeds the second flight of the belt conveyor system (1.1 km long, -128 m elevation, -12.5 degrees maximum decline slope).
We hope someone can help us with some practical information about the maximum incline and decline angles and also about the repose and surcharge angles for handling iron ore pellets.
Thank you.
Josue F. Reis
josue.reis@mbr.com.br ■