Crushing, Screening & Conveying

Crushing, Screening & Conveying 2017-04-04T06:57:13+00:00
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Started by cskumiega
Malian hard rock gold mine needing improved performance on hammer crusher, 20%+ too coarse.                      
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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.processingmaga...
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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...
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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 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 replied to by Winston
In the search engine and 911metallurgist, there is much info about jaw crusher, as one engineering assistant, I just share what I learned during daily work in the past ten years. Jaw crushers are div...
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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 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 ...
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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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212
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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:...
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347
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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.
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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...
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198
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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
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191
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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.
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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 ...
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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 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...
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532
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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 -...
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354
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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...
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338
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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...
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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
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482
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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.
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553
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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.
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474
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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  
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307
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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...
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794
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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 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 ...
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297
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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 ...
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318
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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 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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539
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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 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 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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