Crushing, Screening & Conveying

Crushing, Screening & Conveying 2017-04-04T06:57:13+00:00
  • To participate in the 911Metallurgist Forums, be sure to JOINLOGIN
  • Use Add New Topic to ask a New Question/Discussion about Crushing.
  • OR Select a Topic that Interests you.
  • Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent).
    Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.
  • Use Add Comment = to comment on someone else’s Reply in an already active Topic/Discussion.

0
REPLIES
56
VIEWS
Started by BItam1609
Hello , i'd like to know what are the most frequent problems in gravel's crushing station  due to mechanical wear and what may be the solutions to those problems . I really  hope that  someone can help me; thank you . 
2
REPLIES
116
VIEWS
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...
3
REPLIES
87
VIEWS
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!    
4
REPLIES
344
VIEWS
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...
8
REPLIES
264
VIEWS
Started by wageeh
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...
2
REPLIES
379
VIEWS
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
4
REPLIES
521
VIEWS
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.
1
REPLY
223
VIEWS
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...
0
REPLIES
279
VIEWS
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.processingmaga...
1
REPLY
295
VIEWS
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...
3
REPLIES
364
VIEWS
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!
4
REPLIES
357
VIEWS
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...
6
REPLIES
425
VIEWS
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 ...
0
REPLIES
258
VIEWS
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...
4
REPLIES
370
VIEWS
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:...
6
REPLIES
459
VIEWS
Started by Smuts
We are producing crushed dolomite with a top size of 3mm using a HSI crusher and want to reduce the top size to 1mm while not substantially increasing the -300 micron fines. Current raw feed is 19mm stone. Is it possible to do this? If so what kind ...
Last replied to by Alex Doll
Remove the balls from the ball mill and install rods instead.  Rod milling makes significantly less fines and can function down to 100 µm as long as the reduction ratio is not too great.
1
REPLY
245
VIEWS
Started by aviasolar
Hi .. Looking for best method to seperate hammer milled solar cells ( polycrystaline silicon)  .. 7% AL content 1.6-2.7% silver and balance silicon. I have them in chip form less than 3cm and some 100 mesh screened as result of running them thru a ...
Last replied to by Rheomet
Not aware of physical method, only of chemical processing to recover your Al and Ag. You would need two steps, one caustic and one cyanide. Testing would be required. You may need more feed to make mo...
3
REPLIES
332
VIEWS
Started by Zoe
Which crusher is best suited to reduce the size of friable 18 mm concentrate to below 1mm?
Last replied to by Zoe
Thanks guys, I got a solution We were looking at 5t/h wet material having about 5-10% moisture content
2
REPLIES
276
VIEWS
Started by Leo5
good day, Wanted to find out if there is a better way of describing the effective aperture size of a slot if one has say 0.63*8.8 mm and 0.63*12 mm. They are both 0.63 mm panels, but how do we account for that difference in slot length in the descri...
Last replied to by Winchester
The difference between the two slot sizes for each panel is the open area per square foot. You could use the open area as part of the description of the panels.
4
REPLIES
379
VIEWS
Started by Eder Figueiredo
Hi everybody.Wondering if somebody could tell me which is the correct type of bronze for bushings applied in the gyratory crusher, such as inner eccentric bushing and bottom shell bushing.A Brazilian’s supplier has supplied the bushings with the fo...
Last commented on by Eder Figueiredo
Thanks for your advices, Baud. They were very useful for me. The alloy is ZCUSN10PB10 which is equivalent to US standard C.93700. As you have recommended, I will prepare the bushing bronze samples in ...
7
REPLIES
724
VIEWS
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 KRISHNADAS
Hi Is the problem solved. As suggested by others, check Moisture content Increase vibration by playing with the counter weights. Who is the manufacturer Contact me if you need further assistan...
4
REPLIES
660
VIEWS
Started by hulk
which formula can permit me to estimate a screen capacity and efficiency.
Last replied to by Stewart Fernandez
look screening efficiencies are simple, give me any screen and I will guide you on  its screening efficiency -   Its what I learnt in my early days with Tega India, honed the skill at Dunlop Skega -...
3
REPLIES
509
VIEWS
Started by virock
I am working with a client to develop an ore diversion chute that would catch ore from the discharge of a conveyor that normally fills a coarse ore bin. The chute would redirect to a stacker.  Two Questions: Typically, how steep can a chute like...
Last replied to by BAUD
You need to determine the natural angle of repose of the material. In the case of coarse sand, it is around 40 °. So the 50 ° suggested by DK is a good start as the slope must be more than the nat...
1
REPLY
436
VIEWS
Started by seelander
I would like some help with impact Crushers.I have just purchased a quarry in South Australia  and the stone is a meta silt stone with LA value of 16 -22.The quarry has a Metso LT 1213 S as a primary and secondary crusher producing Concrete Aggregat...
Last replied to by
Usually, A jaw crusher is generally used as a primary crusher in a crushing circuit. the PE type jaw crushers feeding size is 125-1500mm, which is suitable for coarse, medium and fine crushing of va...
1
REPLY
401
VIEWS
Started by Fabian Rebolledo
Hello, i would like to know if there is some technologies or innovations for the automatisation of conveyor belt splicing process.
Last commented on by paussado
good
2
REPLIES
620
VIEWS
Started by lordi
Hello,I need some advices about usage of the cone crusher Metso GP200 with shorthead cone. In prospectus is written that it can work without high level of material in crushing space. Is it true? Crusher will be work in the close cycle with screen, p...
Last commented on by jerodmorris
Thank you.
8
REPLIES
765
VIEWS
Started by Eder Figueiredo
Hello everybody, Wondering if somebody could help me. I have experienced many problems due abnormal power draw behavior of the electric motor in a primary gyratory crusher in iron ore crushing , especially when the service life of the first row conc...
Last commented on by Eder Figueiredo
Thanks Paul. This article will be very useful to me.
3
REPLIES
599
VIEWS
Started by Fabian Rebolledo
Hello everyone, I would like to know the last tendences in Css measurement instruments for giratory crushers. I know about Crusher Vision Automation System, C-Gap.
Last replied to by czambrano
Please look at this C-Gap, I have seen this working. http://www.mintap.com.au/cgap/Mintap_C-Gap_Presentation_Oct_14.pdf  
2
REPLIES
431
VIEWS
Started by Eder Figueiredo
Hello everyone. My questions are regarding to maintenance of the primary gyratory crushers. Does anybody know any kind of sensor to monitoring head spin of the main shaft of the primary gyratory crusher? During the measurement of the spider bushi...
Last replied to by czambrano
Hi Eder, We have used grease for the cap and this grease was pumped by pulses as long as the level indicator was not showing high. One issue was that one time this sensor got damaged and we had to p...
6
REPLIES
1074
VIEWS
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 HAL
Generally the feed level is maintained at 2/3 level so that there is enough space to receive the elongated boulders from the ROM without bridging. The C-140 is sufficiently powered to handle a coarse ...
1
REPLY
402
VIEWS
Started by HTFU Mining
I was hoping someone could tell me what is the FINEST/Smallest particle size I can achieve crushing Quartz after being put through a Jaw Crusher then entering a Symons 2Ft cone crusher .Thank You.
Last replied to by David
Look deep into https://www.911metallurgist.com/blog/cone-crusher#hydro-cone_crusher_capacities A 24" cone crusher was likely the smallest on the table. Use the HP on the motor to guide you. At the ...
2
REPLIES
417
VIEWS
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...
3
REPLIES
566
VIEWS
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.  
1
REPLY
533
VIEWS
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.
2
REPLIES
462
VIEWS
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.

Please join and login to participate and leave a comment.

BUY Laboratory & Small Plant Process Equipment

We have all the laboratory and plant equipment you need to test or build/operate your plant.

ENTER our Mining Equipment' Store

We Sell EQUIPMENT for all types of Mineral Treatment PROCESSES and Laboratory Testing needs

Do you need METALLURGICAL TESTING of your ORE?

View the Services we Provide

911Metallurgist Mineral Processing & Process Development Laboratory

We have a metallurgical test for every possible mineral type and treatment.

Need ENGINEERING Services or Plant TROUBLESHOOTING?

We can IMPROVE ALL PLANTS / Mineral Processing Engineering & LABORATORY Ore Testing

911Metallurgy Engineering

Contact us for process engineering, metallurgical investigations, plant optimization, plant troubleshooting, needs. WE “FIX” METALLURGY.

I Need Consulting Engineering Help
I Need Ore Laboratory Testing