Gravity Separation & Concentration Methods

Gravity Separation & Concentration Methods2017-04-04T06:57:23-04:00
  • To participate in the 911Metallurgist Forums, be sure to JOINLOGIN
  • Use Add New Topic to ask a New Question/Discussion about Gravity Separation/Concentration.
  • 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.

1
REPLY
408
VIEWS
Started by Seeker
Please help me! I have mixed metal dusts ( coarse grains ) of copper, solder & aluminum. Can I separate all those metals by using Air Knife for grain separation? Link to the video: https://www.youtube.com/watch?v=tVu3_0l0tmE Thanks in advance!
Last replied to by Todd H
There is big difference between the SG of grain and that of metal!  It might work with some modifications.  Why not look at using a shaking table? Google it there are lots of videos. Regards Todd
1
REPLY
282
VIEWS
Started by j.honarpazhouh
hello everyone We have hematite deposit that Our ore contain hematite(65%), quartz(25%) and feldspar(10%), and at 400 micron about 80 percent of our hematite particles are free. in your opinion Can I use Reichert cone for ore concentrating? And whic...
Last replied to by m_aazami
Dear Dr. Honarpazhouh Greeting For your information the best gravitational method for  concentration of hematite is spiral system and Reichert cone has lower priority in comparison with spiral.  ...
1
REPLY
196
VIEWS
Started by JGR
Hi, I have extensive experience in DMS for a number of commodities however, I have been asked to investigate the use of rotary pans for the recovery of diamonds. I have spent some time on the web trying to find a fairly detailed process flow diagram ...
Last replied to by rob riggir
Hi Ian, I can help you with your investigations, having been involved with the operation and design of diamond pans in South Africa, Brazil and Australia. I have design calculations as well. You ca...
5
REPLIES
722
VIEWS
Started by Peter J
What equipment is best to separate mill oversize from carbon after a disastrous mill run put about 200tons of grit into CIP circuit? I once used a spiral wheel but it would be very slow at this tonnage:  Would an agricultural grain destoner work?
Last replied to by SIMetallurgist
We use a coal spiral to separate grit and carbon. Our ore SG in 2.6 so similar to yours.
2
REPLIES
243
VIEWS
Started by Char
Hi, can someone tell me from experience, what the smallest gold particle size is that will fall through water due to gravity of 1g? I.e. will not stay suspended. If possible, can you give a range for clear and silty water? Thanks C    
Last replied to by Char
Thanks SmartDog for the response and links. Much appreciated. There is a lot of interesting topics on your website that will keep me busy for a while. Regards, c  
1
REPLY
181
VIEWS
Started by Hamid72
Hello everyone We have an manganese deposit that contain todorokite, cryptomelane, pyrolusite, hausmannite. at 60 micron about 80 percent of our manganese particles are free. in your opinion what is the best method for this ore concentrating? thank...
Last replied to by SmartDog
Flotation
1
REPLY
271
VIEWS
Started by Cash Positive
Has anyone done any research with light spectrum to increase recovery on gold table? Has anyone done any work with different light spectrums and or dyes to increase recovering on gold shaker tables?
Last replied to by Todd H
I am not sure that anything you do will change your ability to influence the table performance - I would simply experiment and use assays to zero in on the right settings.  Tables are fairly rudiment...
1
REPLY
230
VIEWS
Started by Eduardo JImenez
Good day for all: Do sanding in cilindrical flotation cells, Wemco type, in continiuos service, will produce an increase or decrease in motor power draw? https://www.google.com/search?q=fls+flotation+cells&rlz=1C1GCEU_enCL842CL842&source=lnms&tbm=i...
Last replied to by SmartDog
First off let us discuss why and how sanding occurs, because that does have an impact.  Sanding can occur for many reasons, the two main and most common being; 1) poor classification ahead of flotati...
2
REPLIES
577
VIEWS
Started by tichalfred
On carrying out tracer tests on a HMS cyclone; the tracers of varying density report to both the floats and the sinks. Seems no separation is occuring and it's a random placement of the tracers. Have varied the pressure and SG to no avail. Have also ...
Last replied to by richardh
tichalfred Hi, sorry. I have been off line for a while. In terms of DMS. What are your cyclone dimensions, i.e. size, cone angle etc. What is the mineral you are sorting? What are is the medium you...
2
REPLIES
322
VIEWS
Started by Sam
I recently purchased a trommel from a friend. It was built by an engineer who is now deceased. It incorporates a shaker deck, a scrubber trommel and a jig. It works fine without the jig (sluicing). The friend didn’t use it. I am curious as to what ...
Last replied to by David
Hi Mike, here is what Sam sent me  https://youtu.be/ysFnPB57zXY
1
REPLY
252
VIEWS
Started by ALanyon
Hi,   I am wanting to examine some methods to reduce the vibration in our Falcon unit. Primarily the high vibration occurs early in the cycle (first 5 minutes). I can see the fluidized bed coming away from the bowl when the high level of vibration...
Last commented on by ALanyon
Thanks for the input. From what I can tell our fluidizing pressure is adequate, running at around 6.2 BAR. I think your second point about sporadic dense feed is more likely the case as the vibrati...
2
REPLIES
388
VIEWS
Started by Millza79
Hi all, could somebody please tell me the typical top size/maximum size that can feed a Knelson and a Falcon?
Last replied to by Gene Cheeseman
Typically the recommended protection screen size would be 10M (2 mm).  They can handle particles up to 1/4" as SmartDog mentioned but you will see a massive increase in wear rates with minimal benef...
0
REPLIES
272
VIEWS
Started by Peter.Li
Hello guys, I am doing a GRG test and analyzing the results according to the paper "Laboratory procedure to characterize gravity-recoverable gold" . I do not know the meaning of "Yield", "Calc.: 4.787 g/t" in Table 2 and how to calculate them.  I ...
0
REPLIES
354
VIEWS
Started by B James
Warning: I am no chemist, so excuse me if I seem green.   How I ended up with Sodium Aluminate: This is a by product from dissolving cast aluminum with sodium hydroxide mixed with hotter and heated. I do this in very small batches. 55 gallon dru...
1
REPLY
248
VIEWS
Started by spsatyananda05
I've activated bentonite with HCl. due to the activation the SiO2 has increased and Al2O3 decreased, i don't have the reason why the SiO2 has increased and Al2O3 decreased. Do anyone know the exact reason why this change happening?
Last replied to by Jorge
Al2O3 is partially leached. If you perform the activation using different levels of HCl, the leaching will increased gradually with increasing HCl concentration. In this way, the relative SiO2 cont...
1
REPLY
245
VIEWS
Started by Sam
I have a project in Arizona. Old manganese mines that contain medium quality gold ore. The manganese ranges from10% to plus 30%. I have 900 tons of ore reserves on two small claims. Water is an issue. Lack of it. I have captured gold via dry washing ...
Last replied to by SmartDog
The big issue is the amount of ore you have.  900 tons is not a lot of ore. Any system beyond what you are already have is going to be in the 50+ t/hr range and cost over $50,000 plus auxiliary equip...
2
REPLIES
482
VIEWS
Started by Raulacun
I have a Knelson 7.5 with vibrating screen. Someone stole the electric motors of the concentrator and the screen. To replace them locally, I need to know the rpm of the motor and the diameter of the original pulley, here we use 110/220 V 60 hz monofa...
Last replied to by jaimecarmonaa@gmail.com
Good morning Raul. Chris' answer is correct. You should only know that the cone should rotate at 400 RPM. Commercially the 3 / 4HP engine can be purchased at 1750 RPM. I do not remember the diameter...
1
REPLY
313
VIEWS
Started by tom peragine
Being a gold prospector for years, I have used small amounts of mercury to recover the fine pieces. A buddy found a large vial of mercury and gave it to me, but it's not shiny clean. The vial seems heavy, even including the water/mercury ratio. It se...
Last replied to by Todd H
Tom, Mercury is tough as no one wants to test it anymore due to the environmental issues.  Its color could be any number of contaminants.  Burning off a small portion is going to be pretty dangero...
2
REPLIES
437
VIEWS
Started by SmartDog
https://dms.licdn.com/playback/C4D05AQGG1zE0prmbMg/40aab5cd5edb49888d365a764b1e448e/feedshare-mp4_3300-captions-thumbnails/1507940147251-drlcss?e=1542340800&v=beta&t=zblyhnoO0tpRmcF4l9GbH38V6Co0KFLhJhKD7PQ3N6k
Last replied to by SmartDog
Many different riffle patterns have been tried, with varying amounts of success.   In this instance I was not trying to propose a particular design, but rather to show how water flows over an obstru...
6
REPLIES
881
VIEWS
Started by GreatPlainesDigger
I am extremely new to the gold and silver recovery world. My uncle has a plot in New Mexico that we recently realised has some metals in it. We took some samples from various locations around his land and had them scanned and confirmed. It's all insi...
Last commented on by Makc
Brqnnn@gmail.com
3
REPLIES
554
VIEWS
Started by Y.Armenta
hello, someone who can help me define the parameters to put a Knelson XD20 concentrator to work. Approximately how much concentrate fits the cone? and how long does the concentrate cycle last? thank you very much.
Last replied to by C. Arnold
As Jamie points out the parameters for the Knelson are application specific.  The mass pull from an XD20 is cone dependent, I've attached the spec sheet which has this information for each of the t...
4
REPLIES
443
VIEWS
Started by Metals Guy
Hi colleagues, I need ideas on methods of pre-concentration before i feed a knelson concentrator. I operate a 90tph SAG mill, with A KC on the circulating load. My Kc feed, cyclone UF ranges around 5g/t but i would like to upgrade this before i feed ...
Last replied to by SmartDog
Jeremy is correct, the best place to do a precon is ahead of the SAG circuit, not afterwards.  this will allow a greater net plant though put and lower the load on the SAG. That said, without a lot ...
5
REPLIES
330
VIEWS
Started by Mahdi
Hi my freandsI want to produce iron concentrate. But due to lack of water in the region, this is not possible. Does anyone know about the production of dry iron concentrate? If someone has iron concentrate production flowsheet let me know. tranks
Last replied to by KM Edwards
There are ways to get around alot of things these days, but this is highly dependent on your ore. Is it magnetite or hematite or goethite? what size does it liberate at. Can you make a preconcentrate ...
7
REPLIES
728
VIEWS
Started by BUBKWEY
below what size can't mercury trap gold from ore Milled By a ball mill ? Discharge size of milled ore is between 80 microns to 500 microns.
Last replied to by SmartDog
Also" https://seprosystems.com/products/sepro-modular-process-solutions/  
3
REPLIES
558
VIEWS
Started by Tsaone
Last replied to by Live Blue Marble
The UltraSep is normally used in the diamond industry as a rakeless thickener. Several mines have these thickeners and they all give similar results and challenges. Ultraseps are difficult to control...
1
REPLY
378
VIEWS
Started by Novus
Which would be the best software to do a simulation of a spiral concentration circuit together with the material balances?
Last replied to by SmartDog
I would start by doing the material balance in a spreadsheet such as excel.  The simulation and modelling can be done there also.  see:  SDM Process Sim at http://www.smartdogmining.com/software/...
8
REPLIES
686
VIEWS
Started by Pingarroncesar17
I currently run a Toll mill “CIL” operation in Perú. We have a 150Ton/D mill. We process Gold ore oxides and sulphides. The ore we process may contain around 20-45% corse gold depending on the grade. The head grade of the mill is 9gr/Ton. we ha...
Last replied to by rob riggir
Hi Ping - if your activated carbon sinks in your leach tanks then you have a major slurry low density issue or your agitators are not working well. Adding a Falcon, of course, will add water so will a...
6
REPLIES
620
VIEWS
Started by cskumiega
Is there a general ratio for a hard rock plant from head feed to trommel output in tons? Trying to replace existing sluices with jigs, helix spirals or multiple tables.  
Last replied to by oro
Helix Spirals and tables are only about 1-2 / hr capacity. One company offers a Helix rougher that I am familiar with but still small volume comparatively.   High volume primary recovery might be bes...
4
REPLIES
455
VIEWS
Started by balaji1967
Hi. we have plenty of low grade ore available here. I have low grade ore of black sand contains 4 to 5 ppm of Au by fire assay test with AAS finish, which i want to upgrade. Is trommel washing plant ok?. supplier says if the input is 100 tons of 5ppm...
Last commented on by balaji1967
Thanks for your reply and it is indeed very useful for me. Now as you said it not pyro treated. It is basically a jewellery factory waste which goes to sewerage treatment and becomes solid residue fr...
4
REPLIES
535
VIEWS
Started by CA
Does anybody know of the differences in the table deck/riffles of the old Deister model #88 coal concentrating cables compared to the Deister model #9 tables?  Would the coal tables work for gold applications?  Are the head motions the same? Deist...
Last replied to by oro
Concentrating milled ores with gravity concentrators especially tables and spirals will achieve best recovery by concentrating the head feed in 2 stages and pre-screen the corresponding fraction.  Ex...
6
REPLIES
622
VIEWS
Started by oro
milled ore tailings are sometimes clay bound (slime) to an extreme and even a standard scrubber trommel will not achieve a complete wash and the small and large clay balls become problematic downstream. It's very much like caliche clay.  What method...
Last replied to by Deano
If you have a 300mm wide ring at the bottom of the scrubber section to retain the feed you can cycle oversize rocks through the trommel to act as milling clay breakers. You would want to have 4 slott...
1
REPLY
1074
VIEWS
Started by obert cement
what is the formula used in blending of coal to get blending ratios so as to meet a required acalorific value, ash percentage  
Last replied to by Todd H
Are you familiar with metallurgical balances or the term Units?   Wt % Assay Units Stream   Energy Density Element 1 (%) Energy Density Element 1 (%) Feed Type A A% a% a1...
2
REPLIES
852
VIEWS
Started by Charlie
Hello guys, I am hoping to get your best recommendations for various gold extraction or recovery methods for non chemical gold recovery. Situation #1: recover gold from scrap electronics Situation #2: recover gold from rock I consider ore. Here the...
Last commented on by David
https://en.wikipedia.org/wiki/Integrated_circuit
5
REPLIES
877
VIEWS
Started by Romain CADENAT
Dear All  I want to remove mica fram a +63-315µm sand.  If possible I would like to do it without flottation, is it possible to do it with hydroclassifier (counter-current washer like floatex, hydrosizer or lavodune) ?  Or with spiral  classi...
Last replied to by Romain CADENAT
Hello David Sorry, I was not clear enough. This is wet. A fellow engineer made some test in the past with wet magnetic separator and the results was poor. Also I worry about cost of these equipment. ...
1
REPLY
495
VIEWS
Started by Anjani Kumar
I have assighned to design a Iron Ore Beneficiation Plant based on Hematite Ore in India of 10 Mtpa. The facilities for Plant will start from receiving of tertiary crushed material in Plant. Plant facility will consist of Sizing screen, Scrubber, Jig...
Last replied to by Anjani Kumar
Please anybody give me the necessary input.

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