Crushing, Screening & Conveying

Crushing, Screening & Conveying2017-04-04T06:57:13-04:00
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Started by redcastle
I have a small gold project that I am looking at conducting a heap leach trial of around 5,000 tons, I'm looking at the most cost effective way to do the crushing with regards to mobile plant hire as I think outright purchase is unsuitable at this st...
Last replied to by redcastle
Sorry I forgot to mention I have agglomeration testwork and it needed fairly high values of cement for adequate percolation, I also forgot that cone crushers can have troubles with high clay content a...
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Started by Nikita Gupta
I would like to understand why do companies use SAG mills instead of Rod mills for grinding these days? Apart from the alleviation of need for secondary and tertiary crushers, is there any other reason for inclination towards the installation of SAG ...
Last commented on by Nikita Gupta
I actually did a cost benefit analysis and found that for use, the per unit cost was lower in the stream that used Rod Mills as compared to SAG mill. Is this an anamoly?
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Started by Nikita Gupta
We are using SAG and ball mills for grinding zinc lead ore. I want to know about the possibility of replacing the same with High Pressure Grinding Rolls (HPGR)s. Would the replacement require any changes in the plant design. What would be the feasibi...
Last replied to by Jorge
Follow the link below to get some key points about HPGR before trying to consider any change https://www.linkedin.com/pulse/high-pressure-grinding-rolls-damian-connelly
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Started by mhasanmtqn
Hello, i want to ask about trommel screen, i had a project to design a trommel screen, but i so confused about the principal to make a trommel screen design, i dont find a principal on internet, if anyone have a book/pdf about that, please share the ...
Last replied to by David
thanks Mike. Most of Richards' books are here https://archive.org/search.php?query=creator%3A%22Robert+Hallowell+Richards%22 and https://catalog.hathitrust.org/Search/Home?lookfor=%22Richards,%20Rober...
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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
When the feed particle size is too large to cause serious damage to the equipment, whether soft or medium hardness, it will cause different damage to the equipment. Therefore, the feed particle size i...
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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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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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132
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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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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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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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314
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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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437
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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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328
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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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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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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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647
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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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611
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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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332
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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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379
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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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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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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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571
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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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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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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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574
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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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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 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 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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