Crushing, Screening & Conveying

Crushing, Screening & Conveying2017-04-04T06:57:13-04:00
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Started by Sarah
Hello, I have a question about coal crusher. Why do we choose impact and roll crusher on coal? Why can't we choose cone crusher? Please help
Last replied to by SmartDog
Coal is very friable (breaks easily) so you do not need the force a cone crusher can supply.  Also a cone will create more fines than a roll crusher.  Another factor being that both roll crushers an...
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Started by Dachmann
Hi, I am new to the field of mining. Recently I looked into the process of liberation and concentration. Many papers suggest that HPGR and Stirred Mills are a better alternative to SAG and Ball mills in terms of energy efficiency and mineral liberat...
Last commented on by Dachmann
Thank you for your answer. The additional maintenance requirements are often ignored in studies. Good point.
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Started by PMD
Hello everyone, I'm currently preparing for a repair job on an old Allis Chalmers crusher from the 50's of which I have no real information on. I've included a photo of the wooden boards I refer to. Replacing parts is all well and good, we have tho...
Last replied to by SmartDog
In all probability they are a combination of shim and vibration isolators.  If you decide to remove them you will probably need to jack up the crusher and put large shims under it.  You will also ne...
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166
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Started by Reactor
We are looking for expertise in the best grade of steel to use for the internals of a pump to transport a slurry with the following characteristics: Particle size is typically 100 mesh / 150 microns Mohs hardness between 3.5 to 4 Solids content ...
Last replied to by Reactor
Thanks for your suggestions.
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Started by Chromst
Hi all,Is it possible to change the closed side setting of a DDC sizer whilst it is operating? Are the roller and breaker bar positions fixed?
Last replied to by SmartDog
It is never a good idea to try and adjust any equipment while it is operating.  This can cause major failures and also safety issues.  You should always have the equipment shut down cleaned out and ...
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301
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Started by kwmcb
Greetings, I'm researching sand mining in Morgan County, WV, USA.  In the pre-1930 pulverizing plant I saw the piece of equipment in the attached photo.  Can anyone identify the device to aid me in my research. Thanks,  Kent
Last replied to by SmartDog
Probably a horizontal hammer mill from the looks.
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Started by MSKabir
I am new in the field of mining and extractive metallurgy. I am looking into calculating/measuring total media wear inside semi-autogenous mills. From reading research papers, I came to know that primarily three wear mechanisms are in play namely: (a...
Last commented on by MSKabir
Thank you so much for the feedback
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588
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Started by RIfkhan
Hi  I am working in a quartz processing plant.  We have a VSI and after the sieve the output is with 1-10mm -50% and
Last replied to by Todd H
Do you have the VSI in closed circuit with a screen?  If so, change the top screen aperture to a finer size to increase the circulating load around the VSI - this will reduce over reduction.  You ca...
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263
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Started by Ranjan
I wish to know about selection criteria of roller screen and wobbler feeder. What are the relative advantage or disadvantage of both these equipment ?
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395
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Started by BillXiao
Hello Friends there, To maximize the MP 1000 power draw for the tertiary crusher circuit, we try to look at the feeder speed and cavity level to control the power draw. Accurate cavity level measurement is critical for choke feeding the crusher. at ...
Last replied to by Todd H
Adding to Craig's post - I have seen the use of variable speed for crushers to maximize choke feeding.  The speed of the crusher changes in relation to the crusher level.  It is a bit of an investme...
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288
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Started by Chapman Quarry
Hello I am looking to find the eccentric speed + stroke of the Symons 3ft, 4 1/4ft, 6ft and 7ftXD cones for a comparison for a customer against the newer style cone crushers. Would anyone have this information in old technical sheets? Thanks Rodg...
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769
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Started by HotelBravo
HelloI am helping a alluvial mine in South America with their transformation to mercury free mining. They have an input of 208t/h of relatively fine particles (-0.25 inch particles make 55% of the total initial weight, -10 Mesh [2mm] particle...
Last replied to by Mike R
You may have solved these problems by now. If not then.... You have a screening and sizing problem, but you did not say what was being done now for those issues, and how. Gradual financial changes as...
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418
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Started by KWENYU
what are the effects of feeding a jaw crusher with material that contains too much fines?
Last replied to by SmartDog
You loose crushing capacity.  Crushing and grinding equipment ( as well as all other mineral processing equipment) capacity is based on volume, the volume of material per unit of time that can go thr...
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Started by Laurence Jannetjies
Good afternoon  Is there a site where I can get free samples of crusher plant modeling. Ie crusher,screens and conveyors   
Last replied to by Jorge
Follow the link below,  https://www.vecteezy.com/free-vector/crusher
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620
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Started by Solaris1987
Hello Dear I work in an iron concentrator plant and in our process and grinding stage, we use a tramp iron for removing of iron scraps such as rods, broken balls before HPGR mill feed which mounted on belt conveyor. The tramp iron is activated by a...
Last replied to by christian2020
Please gentlmen,best Metal detector(s) to distinguish & remove silver scrap from poor mix silver gold ore screened ?
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560
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Started by Chromst
Hi everyone,I need to find the throughput (in tph) of a primary jaw crusher that is fed by a Grizzly screen O/S. There is a throughput recorded for the grizzly screen feeding belt but how can I find the cutpoint of the grizzly screen? Would it be bes...
Last replied to by SmartDog
You start asking about the crusher throughput, and then talk about the grizzly cut point. Are you looking for the cut point of the screen in size or tonnage?  For the size measure the opening size an...
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301
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Started by happie
Hi everyone, we have a quarry which is to have two products at the same time since they are all highly needed, aggregate for railway construction and aggregates for road, tall building, and houses. could you please recommend the best crusher/s for t...
Last replied to by SmartDog
Start here: https://www.mclanahan.com/products/modular-wash-plants and here: https://www.kpijci.com/equipment/washing-and-classifying/complete-systems/ and here: https://www.mccloskeywashing.com/...
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349
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Started by braster22
Hi everyone! Do you know anything about coal sampling devices? https://patents.google.com/patent/US5413004A/en This sampler contains a horizontal shaft hammer mill. But is it possible to change it to a vertical shaft hammer mill (0,5 meters rotor ...
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1045
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Started by Bob_T
I have an old Union Iron Works jaw crusher that we're trying to get back into service.   It came with a 3 phase 15 HP electric motor and we're not sure which direction the crusher flywheel should rotate.   Looking at the crusher from the side, wi...
Last replied to by Bob_T
Thank you both for your replies, they were very helpful.
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595
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Started by gdwright
Good day, Hi, i would like to know the appropriate way of dealing with the used polyurathane screen panels as a waste material.
Last replied to by Peter J
It depends on your location as to whether they have facilities. If you have large enough quantities you may want to look at "Plastics markets" which looks at recycling across North America https://ww...
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Started by vaheedghassemy
hello friends  do you know how i can calculate and design the output capacity for a jaw crusher? thanks a lot 
Last replied to by ECD40
The best thing is to contact the jaw crusher manufacturers with the information on the application.  Try Metso and FL Smidth.
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547
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Started by Natally
I am struggling on the type of primary and secondary crushers that i need to select and size for a copper supergene ore. The ore mainly consist of;  • Chalcocite (Cu2S) 33%• Copper Oxide (CuO) 53%• Dolomite [CaMg(CO3)2] 14% The ore a...
Last replied to by David
https://www.911metallurgist.com/blog/primary-crusher-selection https://www.quarry.com.au/files/technical_papers/microsoft_word_-_technical_paper-no.3.doc.pdf https://www.quarry.com.au/files/technica...
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568
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Started by quickgrow
Dear folks, I have been using coffee grinders and blenders to pulverize black basalt scoria gravel into powder sand for agriculture experiments but have been burning through blades after five or six cups of gravel.  What is the best way to do this ...
Last replied to by quickgrow
Awesome, thanks!    
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Started by Eder Figueiredo
Hi Everybody, I have seen many people get injured seriously during activities regarding the removal of the scrap metal such as excavator and loader teeth, drill bits in crushers. The major risks are sliding material and flying metal during cutting. ...
Last replied to by Eder Figueiredo
Nurettin and Master Q,Thanks for your comments, I fully agree with you. Any human interaction during this activity can be very dangerous. Frequently the mainshaft of the crusher keeps jammed too tig...
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702
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Started by 15uzu
in order to make percolation  leaching more effective we need to separate fines from the feed , we need to use a screen for this purpose, but for power and economic reasons we want to make a stable screen (without vibration) , the question now is : ...
Last replied to by Nurettin
For leaching part I want to add that; leaching efficiency is not only percolation rate. if you only focus percolation you will increase gravity effect to solution and decrease capillary effect and so...
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Started by Mike Rockandel
I am looking for an expert on impact crushing systems. The expert will review and provide recommendations for improvements on an existing operating system for a major producer.
Last replied to by David
Try edwardwipf@bellsouth.net EdRockMan IV LLC of www.edrockmaniv.com
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1327
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Started by Okay
Hello everyone, I need an advice for selection of jaw crusher. I know the calculations as product analysis information to select gyratory crusher (i.e. P=136(x^0.878)) but for jaw crushing I have no idea. Could you please suggest reference ?
Last commented on by
thanks for sharing.
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543
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Started by cskumiega
Malian hard rock gold mine needing improved performance on hammer crusher, 20%+ too coarse.                      
Last replied to by BAUD
I suggest you to share the following information for an effective approach of solution: -Feed particle size distribution and F80 -Product particle size distribution and P80 (current and target) -Cu...
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700
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Started by Robert
This is notice of a webinar on Thursday about auditing screening process. I can't attend due to a conflict. If someone else is interested and participated, I'd appreciate hearing your thoughts / learning. Thanks, Bob https://www.processingmagazine...
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Started by TISM
While metallurgists and process engineers go to great lengths to select and optimise the unit operations in our pit-to-port value chains, we are often let down when it comes to the commercial operation because the bulk solids just won't flow consiste...
Last commented on by TISM
All the best with the trial and error approach but I’m an engineer and wherever the science exists (as it does in the case of bulk solids flow) l’m going to seek it out and use it so things can be...
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Started by fina
i have a question about law of comminution in the book that i read there are 4 laws, rittinger, kick, bond and holmes. for each law, they have their own constanta, but unlike bond that has bond's work index, i can not found rittinger and kick const...
Last replied to by fina
very helpful answer, thank you!
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Started by fina
i have some questions about hammer crusher. for jaw crusher or gyratory crusher, there are spesific formula to calculate crusher power consumption but for hammer crusher, i can't find any  formula i also want to calculate hammer crusher power eff...
Last replied to by Robert
ACARP sponsored some work directed at building a power model for hammer mills and the comminution of coal. I flag some comments about the models (below in red). Shi, F., et al., Impact of Milling T...
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Started by Kedougou gold
Hello All  Have a newbie question.  we have a geology for a new site and the ore we need for final hammermill  The mineralogical study carried out on this ore allowed us to make the following observations: Gold ore is macro-grained, whitish, g...
Last replied to by JJA
Hello Kevin, I would see if it's possible to upgrade the wear parts to something more robust. AR400 or AR500 steel for liners, rotors, and screens, and maybe a chrome alloy for the hammers. Based on ...
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Started by Robert
Bougainville crushing plant was a bottleneck and major improvement opportunity. Malcolm Lees presentation reviews the work done to improve overall operational efficiency in this video: https://www.youtube.com/watch?v=u9n4Po4nIRs It includes: Bo...
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Started by Jon Juhlin
The attachment (cone crusher wear profile.pdf) shows a before/after profile of wear parts from a cone crusher. The light line is the original profile. The bold line is the worn profile. The phantom shows the worn liner profile where it would have...
Last replied to by David
Hi Jon,  - operational changes that could be made = BE SURE to choke feed the crusher. I have never seen or hear of a design that allows for no choke feeding. Also, be sure to use quality liners:...

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