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Started by anjanisail
Dear all In our Steel Plant to remove fines from Lump in iron ore, one Double deck screen is installed and is working, but with very poor efficiency. All the top and bottom deck are of Polymer panel. Top panel opening is 22mm sq. aperture and bottom...
Last replied to by Stewart Fernandez
Hi, please read the two papers I have put together: 1  https://www.linkedin.com/pulse/getting-your-cross-tension-screens-operating-peak-stewart-fernandez?trk=mp-reader-card 2  https://www.linkedi...
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Started by bopper
We are making roadbase on a new basalt site, we are struggling to make fines with our jaw screen cone circuit . To get the gradings within the envelope we have to import up to 30% fines, my question is what would be better - to introduce an impactor?...
Last replied to by JackStephen
Is your feed 100% basalt? I mean.. isn't it an andesitic basalt? That would define how abrasive it is (because of it's silica content). Can you generate more fines from the quarry, adjusting your blas...
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Started by Muzza
Dear Members can you please give any thoughts to mixing jaw liners with two types of profiles. we have a Svedala Jaw Master 1208HD crusher with a grizzly feeder our CCS is app125 /130mm crushing Basalt rock. We ordered new liner through another s...
Last replied to by David
As Bob indicated Muzza, do not worry too much. It will work. As long as they fit, you are good to go.  
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Started by A B Sharma
How to calculate stone sizes range produced by jaw crusher in % if i have 36" x 24" primary single toggle jaw crusher & Closed side setting is 4" (100mm) and vibrating screen having 60mm, 30mm, 10mm & Dust mesh. Material : Construction Aggregate. ...
Last commented on by A B Sharma
yes.. totally worth it.
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Started by Sathia
Good day. Dear Members, We are using METSO C140 Jaw Crusher to crushing granite stones. As i know, the Jaw Crusher performance will increase if we choke feeding. However, METSO is not recommend choke feeding for Jaw Crusher.They do recommend choke ...
Last replied to by Sathia
Good day. Dear Members, Thank you very much for all your kind information. Please found below for METSO comment. "The cavity level as mentioned in the referred topic is 2/3 which is good enough; th...
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Started by Mulu
I have 2 belt scales and use to calibrate them one by chain roller and the other with static load. For the roller chain the reading (repeatability) are: 13714,13681,13733,13698. What do those numbers tells me and how could i account for the error f...
Last commented on by Mulu
A gold processing plant.
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Started by Dzapasi
We have an HP300 crusher in our operations carrying out tertiary crushing duty where it reduces material of P80 - 32mm to P80 - 16mm.  The ore feed is kimbelite ore which is resulting in a clayish product build up in the crusher discharged chute and...
Last replied to by JackStephen
Hi Dzapasi. For application we used a simple pressure sprayer like this:It could also be applied with a mopper but with lots of waste. The operator sprayed every problematic area at the beginnin...
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Started by JackStephen
Hi everyone, The company I'm going to work for (beginning in january)  is looking to expand their operations and are planning to acquire a barely used track mounted HSI crusher (KPI FT4250 rated 500TPH according to manufacturer) to produce minus 1/...
Last replied to by AJNeale
My guess is that you are going to have enough horsepower on the HSI, and it will all come down to screening efficiency which may mean increasing the size of the screen, and perhaps going to a double d...
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Started by vshastri
When designing a crusher for a mine which experiences a transition from soft to hard rock ores, how can you ensure the crusher will be able to optimally crush both ores for processing during the LOM production? In addition, what metrics from the roc...
Last replied to by Paul Morrow
Designs are often based on the harder rock but it truly depends on your hardness variability. If you have an extremely hard rock but sampling has it representing only 5-10% of the pit; you may not wan...
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Started by New Era
Our crushing circuit contains primary crusher jaw , secondary cone crusher and tertiary cone crusher in which closed circuit with a double deck screen. the ore is quartz vein with average of Bond RWI 17.5khr/t and Bond BWI 16.8 kwhr/t. The chutes ar...
Last replied to by Stewart_fernandez
the selection of material on wear liners
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Started by madineh
Hi, we use two roll crusher as secondary in pharaformaldehyd powder production plant (in closed loop) , but 30% of output material is in flake shape , roll dia :400 mm with : 350 mm input size: 10 mm output size : 2 mm , what can we do to decrease th...
Last replied to by Philip Stewart
Standard problem with roll crushers.  Run roll product through a. small hammer mill.  
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Started by Jeky
I've been reading posts/responses about comparison for static against portable stone crushers and got to know what really we want for our new project, now my question is we need to embark on a road construction, civil works and construction of 1000 l...
Last replied to by David
Hi Jeky, The largest gold miner in the world is China. I assure you they know how to make crushers. You just need to know who to buy them from. Email me if you want to know.
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Started by Paul Morrow
All Metso C-Series Crusher models have a maximum possible setting as well as a minimum allowed setting, and Metso claims it is very important that the user understands why these are important to keep these in mind at all times. The maximum possible ...
Last commented on by lordi
What do you mean on 3/16", P80? What capacity and ore strength?
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Started by Goldman
Hi, I'm just wondering if anyone has any info on how to conduct a survey to calculate recirculation load on a crushing circuit? The circuit consists of a jaw crusher and a secondary and tertiary crusher. Any assistance would be helpful.
Last replied to by lordi
Calculation of rough calculation of closed circuit Qs=Q(1/E + B+/B-), where Qs - Total screen load, tph Q - Fresh load, tph E - efficiency of screening B+ - content of larger than cells class...
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Started by Stalin
What are the effects on temperature of the trunnion bearing when the high pressure pump is run continuously?
Last replied to by Sugar Watkins
A scrubber & pedestal? You never said anything about that is your original question... http://mclanahan.com/wp-content/uploads/Rotary-Scrubbers-Brochure.pdf You talk about the pedestal use being a ...
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Started by firebird
Recently part of our linear screen is damaged. Most of the Coarse ones are going to the undersize chute. The formula for screen efficiency is 100-(% of undersize in the coarse product). However since the oversize is going to the undersize, could I de...
Last replied to by firebird
Really appreciate that guys pawl and raghdumhi. Helps a lot.thanks  
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Started by isang phakele
Q. compare a jaw crusher with a gyratory crusher of the same gape I) which one will have higher capacity and explain your answer in detail.
Last replied to by David
Hello Isang and welcome.  Dear Isang, we are not here to do your school assignments. For your own good and professional development it is best for you to research and answer this for yourself. That ...
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Started by ThomasS
Hello: I understand the mantle rotates on a eccentric drive. How does the mainshaft pivot? Thank you,  
Last replied to by David
Hello Thomas, The spider holds the top of the main shaft. The top bushing (spider bushing) is sort of hourglass shape so the top can pivot whilst the bottom is rotated around the eccentric. https://...
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Started by NAVEEN VARMA B
Dear group members, I would like to know how to up scale the crushers ie,. JAW CRUSHER,CONE CRUSHER, GYRATOR Y CRUSHER, HAMMER MILL,BALL MILLS  etc....
Last replied to by David
Hi, this is much to vague a question. to start, review https://www.911metallurgist.com/blog/how-determine-size-crusher and https://www.911metallurgist.com/blog/grinding-mills and https://www.911me...
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Started by JoseMorais
Hello there,I'm a mining engineering student at Faculdade de Engenharia da Universidade de Porto, in Portugal, and I'm part of a group that is doing a project related to the rehabilitation of a quarry. In order to complete said project, I'm in need ...
Last commented on by JoseMorais
Thank you!
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Started by Sainath Reddy
Cone crusher lubricating system pressure gauge becomes gradually decreasing and cone gets trip what is the reason please can you advice me.
Last commented on by James Boimah
Hi perhaps the cone seal is damage
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Started by Sachin Prakash
I have two questions in the field of HPGR:How much is the cost of grinding porphyry copper ore with HPGR?Which crushing circuit can simulate HPGR product in the pilot scale? Due to the high cost of buying HPGR can be used.
Last replied to by David
This PDF could interest you:HPGR Process/OverviewHPGR vs. SAGThe ManufacturersMine Operations using HPGRProjects by Wardrop/Tetra TechEconomic BenefitsQuestions
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Started by Marshal Meru
What volume of the feed bunker HPGR? From practice enough for 1.5-2 minutes of work. What do you think about the bunkers volume?
Last replied to by Bill Rico
The bunker doesn't need a large volume but it has to be large enough to ensure proper function of the HPGR. The bunker has to be installed on load cells; this is an important part of the control strat...
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Started by Tarun Karakoti
Anyone has experience in obtaining CWi of PQ core? Should we crush the core and control screen at 75 mm or should we cut. If cut the core is the best way, how are we going to cut?
Last replied to by Standartenfurer
There is a lot to be said on the empirical derivation of energy required for crushing at different size ranges! It also depends upon the degree of repetitive actions for breakage; the Bond Impact test...
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Started by Subhash-Kumar-Roy
Is there any standard regarding the CWi test result variation? We experience a 15% standard deviation of the 20 pieces impact test results.
Last replied to by Jean Rasczak
There are two users of crushers that tend to have opposing goals. What's good for one is a disaster for the other. When someone talks crushing efficiency you have to know who their market is and how e...
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Started by Bob Mathias
Want to know how long your vibrating screen elements can last without shut down and any maintenance. Interested in SAG mill that does not have a trommel screen and mill size is as large as possible (such as 36' to 40' diameter).
Last replied to by Carmen Ibanz
In my experience the main factor is the material quality of screens. By frequency you mean stroke?3 months for a 6500 ton/day is a very low durability, they are metallic, rubber or polyurethane? Which...
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Started by Kobby
Please i need more information with Metso gyratory crusher lubrication of the main part like mantle, thrust and pinion bearing. And also how the filtration is done and the type of filters they use in their lube system. Am a Mechanical Engineeri...
Last commented on by David
This is all I got for you Kobby.
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Started by Ace Levy
I'd like to know what effect the type of crusher used has on the particle shapes it produces. I would appreciate your answers based in knowledge and experience you have.
Last replied to by Raje Singh
My experience with crushers!A. Primary crushing form 60'' boulder to 300mm. There are different types of primary crushers.GyratoryJawHammer mills.Flaky ore: Example Lime stoneGy Cr and Jaw will not wo...
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Started by lrcm25
In the design of comminution circuits, why is  the capacity of crushing circuit normally twice the capacity of grinding circuit?
Last replied to by David
https://www.911metallurgist.com/crushing/crushing-and-grinding-efficiencies/https://www.911metallurgist.com/crushing/which-is-the-more-efficient-rock-breaker/
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Started by Raje Singh
Anyone have a PSD predictive tool to predict expected product PSDs from double-roller crushers, Jaw and Gyratory crushers if you entered the input PSD ranges. Are there ways to manipulate these crushers' PSDs without replacing the crusher.
Last replied to by John Koenig
There is transfer functions that can describe the crusher feed to product, and can be related to gap and throw. I co-wrote a paper for the IRR 3rd Annual Crushing & Grinding Conference 2001, that show...
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Started by Gruppen
What is a good reference for the dimensioning of these types of crusher: gyratory, cone, VSI, HSI?
Last replied to by Carmen Ibanz
Such as mentioned before, this depends on: the initial size, final size, next use, mineralogical characteristics, etc. In the case of VSI has limitations for some sizes, typically selected for materia...
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Started by David
If you are trying to evaluate the Efficiencies of Crushing and Grinding you may look at Ackermann, L. J. chem. Soc. S. Afr., 1946, 47 (1), 56. Discussing the paper of the same title by T. K. Prentice, S. Afr. Min. (Engng) J., 1946, 57, 427. Evidenc...
Last replied to by David
And http://www.911research.wtc7.net/cache/wtc/analysis/collapses/eloranta_97.htm
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Started by David
If you would like to know what is the More Efficient Rock Breaker? Bond, F. C. Engng Min. 1954, 155 (1), 82. From data put forward in Rep. Invest. U.S. Bur. Min. No. 4918 (Venon C. Davis), Taconite Fragmentation, June 1953, it is possible to compar...
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Started by Carmen Ibanz
Mineral processing plant throughput boost by additional HPGR circuit installation as a 4th stage after conventional 3 stage crushing?Does any one have a real experience in application such a decision? There are a lot of benefits for a downstream proc...
Last replied to by Carmen Ibanz
Thank you for links presented. Very useful. I'm currently involved in similar reengineering project in Mongolia. Hope to present the results soon.
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Started by David Kano
The T10 is useful as a single number which describes the Particle Size Distribution for the product from Crusher Discharge's operation relative to (size by size) feed size i.e. % passing 1/10th of parent size (s). Can T10, or a modified T10-type ...
Last replied to by OberstGruppen
Blasted ore does not have 'natural' size distribution i.e. the muckpile will contain fragments which resemble the original defect spacing or foliation frequency of the intact rock, plus the pulverize...

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