Crushing, Screening & Conveying

Crushing, Screening & Conveying

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Started by christian tshakambowa
hi everyone my concern is like that :  I am working in a copper concentrator using HPGR for finding Ball mill we are facing with rolls working pressures dropping itself. For becoming normal we are restarting it and affecting the running time so t...
Last replied to by SmartDog
Most newer roll crushers control the roll set using a hydraulic system  (Older, like 40-50+ yearss ago it was controlled mechanically by setting the space between rolls.)  This means you have a hydr...
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Started by kikonatsumo
Hi guys, I want to ask how to size a rotary vibrating screen with single layer and 2 outlets. I want to use the screen to separate course ash and fine ash (under 150 micrometer). I got the mass flowrate of input and output but I don't know how to sta...
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Last replied to by kikonatsumo
Thank you so much for your help SmartDog. I already read your materials and sized my rotary vibrating screen. Currently, I am working on a P&ID diagram drawing to control my rotary vibrating screen op...
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Started by aua kiahla
Hello everybody. I've been studying lately about energy consumption for crushers but I haven't found anything regarding this subject for the screening area. Could someone help me and tell me if it is possible to do this energy estimate for screen?
Last commented on by SmartDog
If you float your pointer over the section title (Crushing, Screening, & Conveying) it will change clor, then click on that title. New page will open and give you the option of adding a new topic in ...
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Started by aweaver
I am learning about various comminution tests and I was wondering how people have previously handled CWi with whole PQ core. I realize that sample size should be between 2" and 3". Should these samples always be crushed versus cut due to the diameter...
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Last replied to by Jorge
To read the key points of the procedure, follow the link below https://www.911metallurgist.com/blog/bond-impact-crushing-work-index-procedure-and-table-of-crushability
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Started by figueroalizcanocarlos
Hello everyone, I have been looking for a formula to the retention time on a mineral rotatory trommel but I'm unsure about one I found in the internet. I want to know if there is a formula for that so I can calculate the average or theorical retenti...
Last replied to by SmartDog
A trommel is a rotating screen, its purpose to separate oversized from under sized material.  The trommel opening I mentioned is the size of holes in the trommel deck.  Then you need to consider how...
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Started by bettsgauce
How many months does it usually take to set-up a static crusher plant?
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Last commented on by bettsgauce
thank you very much for this sir smartdog!
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Started by erdenetsogt
Hi everyone? Is VSI good choice for circulating load or over sieve product of tertiary (3rd stage) crusher. The ore has p80=18-20 mm, Bond work index Bwi=15-17 kWh/t.?  How about the CAPEX and OPEX?
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Last replied to by erdenetsogt
Hi dear, sorry for long time i was absent Yes, we want 4th stage crusher to reduce size of tertiary crusher product size (i mean over sieve product which is circulated again and again) Size is optio...
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Started by wtan
How does presence of shale in mineral processing affect the grinding circuit (mill). Is it just a wear issue with the mill liners? or the efficiency of the grind size.
Last replied to by SmartDog
As with many thingd, a simple question with a very complex answer, "it depends". First off, shale being fairly friable it grinds easily, but does tend to create a lot of fines.  If you are a cement ...
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345
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Started by ppquintal
Hi. What is the best type of backing compound to use between the mantle and the main shaft in a gyratory crusher? Is it an epoxic base material? The mantle is turning around the shaft, meaning that the locking mechanism is not working anymore. Wh...
Last replied to by David
we used http://nordbak.co.za/flooring/
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Started by alitorabi1369
Hello good time - Thank you for answering some of my questions One of the main problems in rotary kilns in pelletizing plants is the presence of chunks or waste materials 1. What is the main reason for the formation of lump? 2. What is the propos...
Last replied to by SmartDog
As said before and implied in David's comments, a main cause is in the pelletizing stage where the pellets are created.  Normally you would have a classification step between the pellet formation and...
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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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Last replied to by Jorge
Roller screen: This equipment can be considered when the screening conditions are very difficult because the moisture content is high and the screen opening is clogged easily. Some engineering compan...
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432
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Started by Fuloshixwa
Good day guys, I am interning at a Gold mine here in Namibia where we seem to be having way to much water being carried over onto our conveyor belts and later on into our concentrate/tailings bins. This water can be seen as a loss of water from the c...
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Last replied to by xosomienbac
thank 
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385
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Started by Fuloshixwa
Good day everyone. Anyone with the belt cut test procedure. The test is used to check if the conveyor belt weightometers are still accurate. Did it once with my supervisor but I cant seem to remember it all. Anyone please? 
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Last commented on by Fuloshixwa
Thank you so much.
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529
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Started by Netsie
How does the size setting of secondary and tertiary crushers is related.we do have Hp 200 and Hp300 cone crushers, for a better throughput how do I have to calibrate them related to each other and the feed material which has size of 80mm and should b...
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Last commented on by Netsie
Helpful!
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Started by alitorabi1369
Hello good timeI am the hpgr operator of a pelletizing plant. Thank you for answering some of my questions One of the major problems in HPGR is the concentration of the concentrate on the rollers. What do you think is the best solution to eliminate...
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Last replied to by mohammad1364
Hello, if you want do maintenance on tyres, for example replacing a broken or chipped stud or you want to measure gap between tyres to reset the static gap, use high pressure water and wash away that ...
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Started by pandamanishankar
I am working on budgeting the costs for an copper processing plant and need to estimate potential power consumption of jaw crusher? I have work index, F80 and P80 of the ore. Any guidance is really appreciated?
Last replied to by Alex Doll
The specific energy consumption at the motor input can be predicted using Bond's equation: E = 10 × CWi × (P80–½ - F80–½) where CWi is your work index, F80 is the 80% passing size of the fee...
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Started by shayne
Am doing an internship at a mine with a comminution plant, how can I practically apply the laws of comminution to predict energy consumption on a 3 stamp mill .
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Last replied to by AmyCarter
I guess it's better to go deeper into the theme and check some specialized resources. But the question sounds a little bit weird now
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746
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Started by balan@ce
Hello, The shaft in question is very similar to the Metso GP100S and the shaft has broken as in the attached picture. The vitals were good and the crusher was beginning to give some odd sounds before the operator found that the shaft was broken. Any...
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Last replied to by
1. The structure design is unreasonable. If the interference between the main shaft and the moving cone is too large, there is no unloading groove, and the transition fillet is too small, the main sha...
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614
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Started by LordPage
Please tell me if you know the year, make and manufacturer of this. Ball Mill located in Creede, Colorado USA. This Ball Mill was driven by a Steam Engine (missing). Do you know what Steam Engine would have been used to drive this Ball Mill?Many th...
Last replied to by David
Hi, no idea as to make or year of this antique. Best I could do is if you gave me the mill's dimensions, I could tell you the Horse Power needed to run it. In any case, where would you get a steam en...
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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...
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Last replied to by Peter Murphy
Depends on the application and ore characteristics. Sizing and selection of appropriate equipment for throughput and recirculation loads to be considered. Full evaluation of project aims or objective...
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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...
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Last commented on by Peter Murphy
Yes agreed, however depends on the application and ore characteristics. Note, HPGR is a crusher used to crush ore, not to mill ore. Therefore HPGR are part of the crushing plant and incorporated only...
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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 ...
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Last commented on by Peter Murphy
Surely its got to do with the feed size and product reduction size required? SAG mills are used predominantly with feed material with a larger max lump sizes (from primary crushing plant typically i...
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1233
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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 commented on by SmartDog
All clays do not expand on wetting, so it is important to determine the type of clay involved. And those clays that do expand do it upon wetting, whether it is a cyanide solution or just regular wate...
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832
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Started by BrantT
Hi.  I'm re-configuring a circuit and i need to install a DSM screen prior to a Knelson though i am not sure how to size it?  Are there any rule of thumbs or models out there to determine the size and angle of the DSM based on incoming flowrate, % ...
Last commented on by SmartDog
I also do consulting, or some say insulting. Either works if I get paid.
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Started by Eder Figueiredo
Dear Friends, I working on a solution for repairing the spider tapered internal bore of our 60” x 89” primary gyratory crusher , as it has loosed its fit interference due excessive wear and can not hold the spider bushing. The results are freque...
Last commented on by Eder Figueiredo
Thanks my friend. I really appreciate your comments.
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Started by Mark Pulley
Hi,our project is a pilot plant for a Detrital Ore concentrator pilot plant. Feed 600 metric TPH Max size 12mm Screen size 1mm After the screen, the +1mm -12mm material goes through a cylclone and is then screened again.my query is... Can the sc...
Last commented on by SmartDog
What kind of details are you looking for? Trommels. scrubbers, or what?
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Started by Jorge Quintanilla
Hello Everyone.i am envolving in a new expansion project en Bolivia. There was a discussion about foundation of crusher equipments, traditionally We use a concrete foundations. But i worked in one plant with steel foundation and we had a big vibratio...
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Last commented on by Jorge Quintanilla
I really appreciate the information, it was very helpful  
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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 ...
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Last replied to by Reactor
Thanks AshKot1. The device we manufacture is not a pump, however, we need to handle the slurry that is delivered by a pump. I'll work on getting the input pressure from the feed pump and the discharge...
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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 AshKot1
So, I believe that the sizing and specification for any metallurgical crusher is based on simple drop test of spherical object on representative size of sample, like x grams of sample. And then the h...
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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 ...
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Last replied to by carman
The first item to understand is a   Trommel Screen is at least 5 times or more less efficient than a vibrating screen. I would suggest you do a area size calculation and see how much area you would ...
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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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641
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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...
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Last commented on by MSKabir
Thank you so much for the feedback
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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 ...
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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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