Crushing, Screening & Conveying

Crushing, Screening & Conveying2017-04-04T06:57:13-04:00
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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?
C
Last commented on by crsp
Hallo Mr. Flores, I have a question about this topic, may I contact you with a pm? best regards
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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.
S
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
Ensure that the jaw chamber is choke fed. The level of material in the jaw should just be below the jaw stock deflection plate. I wonder how you extend the life of jaw liners And Reduce volume of fines and wet material entering the crusher.
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Last replied to by
As a manganese casting engineer, I share my ideas about the wear life. The hardness of material which you crushed, it is the most important figure! Most of jaw plates are manufactured by high manga...
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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 Helena Russell
Is there any standards or guidelines to determine the expected or typical "life span" of all wearlife of parts of jaw crusher, cone crushers or VSI crushing plant. Any help on what wear & tear can do to liners and other crusher parts is highly apprec...
Last replied to by Bob Mathias
Wear is material loss on surface by means of several different mechanisms. The two main wearing mechanisms in crusher cavity are: • Abrasive wear• Fatigue wear The main wearing mechanism in ...
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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 ...
J
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.
J
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
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 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
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
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
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
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
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
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
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 ...
O
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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Started by
We are experiencing a lot of trash metal (excavator and loader teeth, drill bits etc.) going through and damaging our Primary Crusher. Is there any scanning or detection technology out there that can identify exotic objects after it has been tipped i...
Last replied to by Paul Morrow
I am trying to co relate the problems at your end.•You have heavy duty drilling machines, shovels, loaders and dumpers whose broken and damaged Manganese steel, hard phased, ni hard ( low fe steels ...
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Started by
In dealing with clay contamination in sand and gravel and crushed rock; most know that some crushers do not handle clays very well.  What is the best or better crusher for clay rich material/ore? A gyratory crusher is inferior to a jaw crusher when...
Last replied to by
Every application in its own right needs to be considered against various methods of process and reduction to gauge which is the most appropriate to your own. We have seen installations where log wash...
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Started by
What is the optimum value of ash that be reduced by comminution operation using rotary breaker in coal preparation? What modifications can be follow through to improve its ash reduction ability? I aim to enhance to separation of hard rocks and crush...
Last replied to by Zander Barcalow
The only way to do this would be to reduce the size of the openings until you are just starting to reject coal. But even then you will not remove all the rock. Is there any processing after the breake...
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Started by Salomon
I am currently on an Optimization project and only given the data as products produced from the cone crusher (symons) which are on the Gaudin's Laws distribution. Now I am ask to develop the model based on the Lynch Model. Can any one help me wer...
A
Last commented on by Salomon
Thanks very much. I will have a look right away. I will update you.
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Started by Jean Rasczak
What is the method of calculating the efficiency of double deck screen?
Last replied to by
Basically the same as a single deck, except the feed to the second deck is the under-size from the top deck. You would normally look at the efficiency of each deck separately, unless you are using the...
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Started by
I am currently scoping an underground crusher upgrade and would be very pleased if anyone could supply me with some technical papers comparing design choices in considering jaw crushers with gyratory crushers.
Last replied to by
If you are looking for technical paper comparing various primary crushers, kindly refer to "Selection and Sizing of Primary Crushers by Ronald W. Utley, General Manager, Crushing Division, FFE Mineral...
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Started by
There is a lot of shale that reports to our crushing and screening coal plant and because of its flat shape it goes through two stages of crushing (using double roll crushers) without being crushed and therefore creates problems downstream. How can I...
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Last replied to by
As suggested by seniors use a slow moving belt conveyor for the purpose of stone picking by the help of casual Labour. Which ultimately reduces the wear and tear in crusher teeth. Otherwise check your...
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Started by
We have 2 options in the potential two grinding flowsheet: A SAG mill in which we are crushing critical size OR A SAG Mill with pre-crushing of the feed. What is better?
Last replied to by
Yes High pressure is now considered as replacement to a SAG mill. In 2008 I reported (Comminution 08) to need the feed size reducing to 40-50mm. To me asked a question: if the feed size is 40mm, why a...
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Started by STAHI
I have a question about CWi calculation.We have an existing plant and I want to calculate the CWi based on Bond formulation and compare it with lab tests results.At the existing plant the data are:F80= 370mmP80= 10mmSpecific energy is 1,8 Kwh/tWhen w...
Last replied to by David
Did you see http://www.911metallurgist.com/blog/bond-abrasion-index-vs-bond-work-index and http://www.911metallurgist.com/blog/bond-impact-crushing-work-index-procedure-and-table-of-crushability + htt...
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Started by
Which other method can I use to measure the gap for a cone crusher other than using the lead button method. We trying to avoid the health risks associated with the use of lead. I need a review if methods on how to measure a cone crusher gap?
Last commented on by David
Foil ball is quick and easy, also try cast lead fishing sinker, the type with brass eye for attaching a line. see
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Started by Maya Rothman
What is the different between XR400 Jaw Crusher and 2644 Premier Track? Both are Recycling crushers but are the jaw plates are same for both machines? What are the differences?
Last replied to by David
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Started by
Mobile VS Static Crushing Plant: I am in the process of purchasing a crushing plant and find myself in dilemma: Apart from the standard reason like ease of relocation, which one is better economically and in terms of working performance. Any inp...
Last replied to by David
Here is an article that explores the economic considerations http://www.pitandquarry.com/tracked-vs-wheeled-portable-plants/. Basically it is in alignment with what others have already stated: if you ...
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Started by
What factors do you consider when you would love to purchase a stone or rock crusher?  Before buying a jaw crusher or a cone crusher, what do you take into consideration in your pre-purchase evaluation?
Last replied to by
Cone crusher application: questions:Please select and input the application information. Underlined information required:* Type: A. Basalt/Granite 0 B. Gabbro 0 C. Limestone 0 D. Sand & Gravel 0*...
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Started by Victor Bergman
Technical Tip on Cone crushers: Performing Daily Scheduled/Preventive maintenance on cone crushers is the most critical step in maintaining day-to-day reliability and optimum production output. Am I on the mark?
Last replied to by
That coupled to central feed distribution/presentation into the cone crusher, a well graded feed with no more than 15% of feed material smaller than the crushers CSS (reduce briquetting) should do the...
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Started by Bob Mathias
What is the root cause of jaw plate that has a very short life span, failure rate is bad. I hope we can improve the liners life, I will inform you all if their is a progress on our Jaw liner. thank you so much.
Last replied to by
The issues are very well summarized: including about the deleterious effects of fines and water on jaw life. Low-strength abrasive materials can cause standard manganese to wear surprisingly fast, a...

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