Re: Scrapping Of Carry Back On Conveyors
Dear Mr. Rekhawar,
I agree with you that it is better to remove the fines from the belt in the chute and to let them flow with the rest of the material. As the majority of the fines already discharge from the belt, that amount that is scrapped off by cleaners is relatively small.
To build an alternate collection point outside of the chute would only increase your labour costs (to handle the fines) and your capital costs (to build another chute system to collect with the fines).
Regards, ■
Re: Scrapping Of Carry Back On Conveyors
Dear Shri Rekhawar,
In general, dust is not objectionable so long it is within the material. The dust only becomes objectionable when it becomes airborne, leaks out in the surroundings, settles on various instruments, harms human beings etc. So, if there is a dedicated dust collection unit, at transfer point, the dust collected by this unit is again fed back on to conveyor.
In case of external scraper it is convenient to mount it within the chute so that all scrapped material goes in to the chute along with the main material.
In case of internal scraper, it is difficult to put this material back on to some conveyor directly by chute. So, some people place steel tray below the discharge point of internal scraper. Periodically, they manually empty the tray onto belt conveyor.
I am not very clear, about the system you are suggesting but dust collection at separate point and then transferring it into main flow would be cumbersome and expensive. However, if you have better idea please think about the advantages and disadvantages about such arrangement. If the advantages are more it can certainly be implemented.
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 ■
Scrapping of carry back on Conveyors
Dear all,
In a raw material handling system for Blast Furnace, there are two different thoughts bout belt scrappers:
1. We scrap the carry back on conveyors; pass it to the down stream conveyor through transfer chute, by installing the belt scrappers inside the chute.
This way the fines will be back into the system and which ultimately go in the furnace (may be partially), since the stock house screens will already be at its maximum efficiency.
2. If we buy the above reasoning than one of remedy shall be to put the scrappers out of the chute and collect the fines out somewhere in the length of conveyor. This way we will have many collection points.
I personally feel that we shall not take out the fines out of the system and let it get separated in the stock house.
I would like the members to opine on the above matter and let us know what a good material handling practice says about it.
Regards ■