Trap For Tramp Material
Hi Dears
We need a system for "Trap of Tramp Material"!
We must feed the Iron Ore Concentrate with 800t/hr rate to special mill (HPGR) and this mill has problem with material coarser than 15 mm.
Iron Ore Concentrate grain size is less than 1mm and its moisture is about 8 to 9%.
We must use a screen system in behind of mll.
If you have any idea about screen type and size, please help me. ■
Re: Trap For Tramp Material
Dear Mr. Majid Arabi,
You are feeding certain material to mill. The mill requirement is that it is not to receive material larger than 15 mm size. This can best be prevented by putting screen before mill. The screen will discharge coarse material as oversize and material less than 15 mm as a screen-out for feeding in to the mill. Do you have any objection / reservation in using the screen?
Regards,
Ishwar G Mulani.
Author of Book : Engineering Science and Application Design for Belt Conveyors.
Author of Book : Belt Feeder Design and Hopper Bin Silo
Advisor / Consultant for Bulk Material Handling System & Issues.
Email : parimul@pn2.vsnl.net.in
Tel.: 0091 (0)20 25882916 ■
Screen For Trap
Dear Sir
Sorry for my dilay. I was in new year holiday.
We think the screen is the best solution for trap of tramp material.
But our question is about the screen type and overal dimension.
Thank you ■
Re: Trap For Tramp Material
Dear Mr. Majid,
The screens are available to handle very wet materials. Please communicate to the reputed screen manufacturers. You might look into the website etc.
There are screens fitted with flexible polyurthane screen cloth, which can create very high acceleration (very large value of G) which allows it to screen and at the same time remain without clogging. There could be also other types of screens. The screens are regularly used for mined lignite, which is sticky, sometimes muddy etc. Screens are also handling sticky material in fertiliser plants, and so on.
As a rule I do not mention the names of manufacturers in the forum because it might amount to the injustice to the names which I do not know.
Regards,
Ishwar G Mulani.
Author of Book : Engineering Science and Application Design for Belt Conveyors.
Author of Book : Belt Feeder Design and Hopper Bin Silo
Advisor / Consultant for Bulk Material Handling System & Issues.
Email : parimul@pn2.vsnl.net.in
Tel.: 0091 (0)20 25882916 ■
Type Of Screen
Dear Sir
I asked from Polysius Co.(the company which he will manufacture the our roller mill in this project) and thay said me: the vibrating screen will be colagged(blinded) because the material is wet and sticky and it isn't useful for this aim, he said the roller screen is better solution.
What is your idea?
And do you say me about roller screen manufacturer?
And do you have any idea or references about designing (dimension estimation and roller speed)?
Thank you ■
Re: Trap For Tramp Material
I suggest you speak to
Abon
http://www.abon.com.au/
RCR Tomlinson
http://www.rcrtom.com.au/
I suspect (re know) there are others.
These will units will come at both CAPEX and OPEX cost, which you will need to evaluate.
Regards,
Lyle ■
Trap For Tramp Iron
I presume you are using imported iron oxide concentrate in the process.
It is better to eliminate tramp iron before it reaches plant by installing tramp iron detection and removal systems on the belt conveyors preceding concentrate bin ahead of the roller press.
It is not easy to screen 800 TPH with 9% moisture content in the space and headroom available at the feeding point of the mill.
As a matter of caution you can also install a metal (tramp iron) detector on belt feeding the mill to stop the system if tramp iron is detected. ■
Tramp Material
Dear Vinayak
Thanks you.
You are right, but we must transfer the iron ore concentrate from port to plant by rail way and then stack that on stack yard, reclaim that by bucket wheel re-claimer, conveye by belt conveyor to a big feed bin (with 2000 tons capacity) and then discharge bin by weigh feeder and transfer the concentrate by belt conveyor to mill department. In this course may be fined some tramp material such as bolt, nut, wear parts, stone, pebble, rubber and …. , then we need tramp system directly before the mill system.
Using the metal detector has some problem:
-It can detect only metallic material and can't detect the other material such as stone, pebble, concrete parts, rubber and … . Of course, most tramp material is metallic but non metallic material may be fiend and they are bother.
- When metal detector system detects the tramp material, the process will go to stop and some body must go to line and fiend the tramp material. Some times it may be happen more than two or three time in one hour and it is very bad. But if we fiend a way for avoiding from this stop, it will be very good.
-We haven't good experience about using the metal detector on belt conveyor with iron ore concentrate. You know, the iron ore concentrate has 68% to 69% Fe and adjusting the system (so preservation of this adjusting) for discerning the concentrate and metallic material is very difficult.
But about screen system, you are right, we have not big space on mill structure and so the screening of 800 t/hr material with 9% moisture is very difficult, but please note: we don't need to sizing, we only need to separate the tramp material and you know: the concentrate grain size is less than 1mm and tramp material is defined the material bigger than 15mm and rate of this tramp material is very low (coincidence). We think in this condition we don't need to big screen area.
Some body said us the roller screen is good solution for our problem. ■
Trap For Tramp Material
You say "we must transfer the iron ore concentrate from port to plant by rail way and then stack that on stack yard, reclaim that by bucket wheel re-claimer, convey by belt conveyor to a big feed bin (with 2000 tons capacity) and then discharge bin by weigh feeder and transfer the concentrate by belt conveyor to mill department"
My suggestion is that you install the screen at a suitable location (transfer point) between the bucket wheel reclaimer and 2000 T capacity bin.
A double deck banana screen of 2.2 m x 6 m size will be able to do the work. A Mogenson’s Sizer can be an alternate solution. ■
Trap For Tramp Material
Dear Sir
Thank you for your attention.
We can't installe trap system befor of bin, because 1) most of tramp material such as wearing parts or bolts, come from bin wear resistance liners and 2) we have limitation for space on the bin.
So, you said about banana screen, but we are afraide! from blinding in vibrating screens. ■
Trap For Tramp Iron
Since you know source of tramp iron, it should be easy to remove the problem.
You have to conside followings:
1: 68-69 grade iron oxide concentrate is a free flowing material. It flows easily and will not clog screen deck.
2: Bin requires wear lines only at the bottom conical portion. Now is is customary to use uhdp liners, without use of bolts protruding in the bin. ■
Trap For Tramp Material
DEar Sir
Thank you
I have two question about your last answer:
1) The bin's liners are one of the most important source of tramp material but thay aren't the monopolistic source. For example: parts of bicket elevator, parts of discharge chute of conveyor, big size pebbels and so on, are another source. Then we must fined the assured way for trap of all tramp material.
2) What is the "uhdp"? ■
Trap For Tramp Material
sources of tramp materials can be listed and action taken to stop tramp material.
1. all tramp material likely to contaminate concentrate before it enters silo should be removed by installing a screen before silo. I can make a suggestion only after I have layout and flow-sheet of your operations.
2. Ultra High Density Polymer liners can take care of tramp material generated in the bin. ■
Trap For Tramp Material
Dear Sir
Thank you
1) Can sent me more information about uhdp liner's?
2) in the pereviuse e-mail you mentioned to vibrating banana screen with 2.2*6m area. It seems very big! because the most material (more than 95%) are smaller than 1mm and mesh of screen must be min. 15mm. ■
Trap For Tramp Iron
1. For Bin liner please visit following site: http://www.kaveri.in/flowpromotion.html
I am in no way associated with this company. I have seen their liner material in use at Hoppers in Port as well as in a pellet plant in Goa, India.
2. Banana screen will be large. for 400 TPH with 99% material passing through 12 mm. a screen deck has to have an area of about 10 sq. m. (sp. gr. of concentrate 2.6) Concentrate is moist, It is free flowing but flow will be somewhat sluggish. Ascreen manufacturer will be able to recommend a size after testing your material ■
Trap for Tramp Material
I must feed the Iron ore concentrate (whit 9% moisture and grain zise less than 1mm and max. 800t/hr feed rate) to especial mill (HPGR) for re-grinding. I need to prevent of enter the croase material (croaser than 15mm) to this mill. I named this material:Tramp material.
Do you have experince about this? and do you can show me a solution way? ■