Re: Crusher Selection
Roll crushers, MMD's anyway, are very good for coal & coke. That's where Alan Potts started out.
If your machine is choked during outages then your feeding is over the top (I don't know how I think of them ).
If your rolls choke then why won't your jaws blind?
Is there adequate headroom for a jaw crusher?
If there is then shouldn't it be possible to improve the maintenance & access facilities for the exisiting machine?
Coke & dust have joyfully co-existed before. Was dust free operation considered to apply to your installation alone?
Don't condem equipment for replacement just because it wasn't properly installed.
Improve feed regulation, dangle a couple of monorails over the job & splash out on a better dust control system.
Alternatively repeat the same expenditure & also buy a jaw crusher which ideally has a gape of around 100mm & a nip of 60mm. Come on..... ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Offer Many Kinds Of Crusher
Dear sir
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vsi crusher(PCL-600,PCL-750,PCL-900,PCL-1050,PCL-1250,PCL-1350),impact crusher(PF-0807,PF-1010,PF-1214,PF-1315),ect.you may choose any one of them,if you want to know more about our crushers,please visit to
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Re: Crusher Selection
You should not use an impact crusher if you wish to control dust. The breakage is by high intensity impacts which generate a lot of fines and dust.
The method of breakage should be a slow process to minimize dust. It may be possible to shroud and baffle the feed and discharge chambers to minimize dust emissions. We do this at conveyor transfers.
The need to clean the crusher when it has been stopped maybe solvable. Not having enough torque to start the crusher after an electrical outage might be due to low motor commutation capacity at locked rotor.
You have not stated the type of crusher and motor details. Is it an MMD or Abon, of Stamler, or ???? This would have to be studied. ■
Roll Crusher Vs Vsi
I have replaced a number of roll crushers in the field with VERTICAL SHAFT IMPACTOR type successfully.
The reason for wanting to replace in the first place.....(on sand and gravel by the way) was complaint of constant rewelding of rolls EVERY NIGHT!
The VSI eliminates any rewelding completely which is a good thing of course, the guy welding loves it. The VSI of course left improperly adjusted will produce too many fines on the low end of the sieve scale. But, with proper speed, proper style of impact SHOES, AND most importantly the proper GAP or space between the face of the impeller and the face of the stationary anvil ...COST EFFECTIVE wear costs per ton can nicely be achieved.
.................
DUST CONTROL: the spinning of the rotor on a VSI for example causes a large mass of air movement and care must be taken to ensure the take away belt under MR CRUSHER......is low enough not to have the effect of fine materials being BLOWN OFF the belt, onto the underside of the crusher and belt and have a general mess for housekeeping. We typically cover the takeaway belt completely for a minimum of 15-20 feet out past the crusher exit area and by this time the material has time to SETTLE DOWN and stay on the belt.
We also discourage use of homemade wetting systems will copious amounts of water to try to attempt to keep dust down. A properly sealed conveyor will do wonders for dust control and a proper dust control MISTING system will also cure the ROGUE DUST PROBLEMS. ■
Crusher Selection
is it possible to crush the coal from 300 to 25 mm in single stage. If possible whether ring granulator is possible to crush. Please give suggestions. ■
Reduction Ratios
Typrically crushing ratios to be effective should be in the 6 to 1 reduction ratio as kind of a rule of thumb.
If more than that.......another stage of reduction should typically be considered. ■
Re: Crusher Selection
Originally Posted by KARTHIK.T
A Twin Roll Sizer would be very good for this application, for more information on our range of Sizers,you can contact me at the following.
Kind Regards
Lee Pickard
Managing Director - Beckerfield Holdings Ltd
Tel China (86) 13621 956627
Web www.trmsizersandshredders.com
Email beckerfieldholdings@gmail.com
Email lee.pickard@gmail.com ■
Re: Crusher Selection
In ring granulator, the crushing ratio varies upto 20:1.depending upon the characteritics of the Coal. You can go through the Handbook of Crushers by various manufacturing companies.
The concern is not only the crushing ratio, but the crushing ratio with the capacity of the crusher. So along with the crushing ratio, the maximum capacity of crusher available in the market is to be known.
Talk to companies like Elecon, L&T,etc to get a better understanding.
Best of luck for next question. ■
Re: Crusher Selection
Dear Everyone,
- Concerning crusher for coke with feed 60-90mm and end product up to 60 mm.
The roller crusher is suitable for this application. I don't know the capacity of plant but the jaw crusher probably isn't right solution for this. In case that you want product up to 60 mm you have to operating the jaw crusher with gap about 30 – 40 mm. (and capacity with gap 30-40 mm is small and bulk density of coke is smaller than the generally rock – by the way would be problem find out large jaw crusher with possibility setting of gap for 30-40 mm)
Probably problem with choke (power switch off) stays with jaw crusher too (because the start of jaw crusher is biggest problem for motor – spin/rev flywheel).
I have experience (The Hammer mills) from coking plant with feed up to 80 mm and final product up to 3 mm that against dust we had to add water into the system on final moisture 11 % of coke. This steps decrease the dust (of course functional dedusting system too) and none sticky of crusher)
- Concerning Roller crusher vs. VSI crusher
In this case (feed 60-90 mm; outlet up to 60 mm) I think that is impossible use a VSI crusher. The outlet from VSI will be markedly finest than 60 mm. And dust problem … VSI has a more rpm than Roll crusher.
About lifetime I think (THINK) that rollers has a longer lifetime than armor of stator or rotor of VSI (Experience from crushing of slag (coal boiler) the lifetime of roller is standard 6000 hours per year).
Every nights re-welding of rolls is unimaginable – maybe better (alternative) technology or at least better welding surface… I understand this fact only in the event that you required very finest and/or close fraction by reason of this must have rolls a constant gap.
- Concerning possible to crush the coal from 300 mm to 25 mm
Which kind of coal – bituminous coal or lignite? Generally YES. Suitable types of crushers are e.g.: Hammer crusher or Roller crusher.
For more information (specific inquire – specific offer) you can contact me at the following:
David DOCKAL
Crushers – Application Engineer
david.dockal@pspeng.cz
www.pspengineering.cz ■
Hammer Mill Capacity
Is it possible to crush the coal from 300 to 20 mm in single stage having crusher capacity 2000 TPH?
Dear expert, have any experience for this huge capacity crusher (Hammer Mill).
If you have any suggestion/advice please convey me.. ■
Crusher selection
presently we are using roll crushers for crushing coke from 90-60mm to 60mm.sometimes we also crush +100mm.problem is that lot of dust is generated.also in case of power failure crusher has to be cleaned.also we have to change rolls (very cumbersome job) every 4 months .my boss had asked for any suggestion.
i was thinking about jaw crusher
wat you all think about this? ■