Gravity Separation & Concentration Methods

Gravity Separation & Concentration Methods

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1942
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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 ...
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Last replied to by Keita
I like to separate sand out of cassava slurry effectively with the capacity of 2 tons of slurry per hour  
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1369
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Started by Viy
About this problem, I found out when developing design of the Device for freezing CZ's without harmful hydrofluoric acid. If I understand correctly, such a problem may arise after the sieving large quantity of diamonds with the smallest size (0.8 to...
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Last replied to by mark mulakazuwa
hie guys, i am currently doing a research about diamond lockup, have come across a document by Machowski. guys on equation number 4 what does tp, and p on summation sign represents or quantity it pres...
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2959
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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...
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Last replied to by Venezueles
Hi Jeff I hope that you are well in our crazy world where no one seems to know what is going to happen next. I'm based in the UK and am looking at methods for non chemical gold recovery from CPU's ...
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1461
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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 FarshidBsr
You can use USIMPAC 3.2 for spiral simulation which is based on the work of H. Fournol, 1974 but, it needs extensive sink and float data from spiral circuit or experiments you may conduct. You can als...
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1960
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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 ...
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Last replied to by David
Hi Mike, here is what Sam sent me  https://youtu.be/ysFnPB57zXY
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1379
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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...
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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...
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1490
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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...
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1377
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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 ...
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1820
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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...
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1169
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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?
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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...
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1348
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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 Mike
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...
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1658
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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...
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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...
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1259
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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...
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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...
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1504
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Started by Mike
https://dms.licdn.com/playback/C4D05AQGG1zE0prmbMg/40aab5cd5edb49888d365a764b1e448e/feedshare-mp4_3300-captions-thumbnails/1507940147251-drlcss?e=1542340800&v=beta&t=zblyhnoO0tpRmcF4l9GbH38V6Co0KFLhJhKD7PQ3N6k
Last replied to by Mike
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...
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2444
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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...
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Last commented on by Makc
Brqnnn@gmail.com
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1871
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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.
C
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...
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1544
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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 Mike
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 ...
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1361
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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
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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 ...
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2596
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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 Mike
Also" https://seprosystems.com/products/sepro-modular-process-solutions/  
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1488
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Started by Tsaone
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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...
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1806
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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...
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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...
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1883
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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.  
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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...
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1297
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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...
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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...
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1582
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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...
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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...
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2276
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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...
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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...
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3291
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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  
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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...
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2409
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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...
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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. ...
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1419
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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...
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Last replied to by Anjani Kumar
Please anybody give me the necessary input.
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1704
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Started by Paul Manumbu
first of all I use this opportunity to appreciate all my fellow metallurgists in this forum, you work is excellent, you are helping a number of people! Be grateful Secondly , am currently involving in small scale gold processing project by amalgamat...
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Last replied to by goldivanti
In small scale mining, or artisanal mining, important is to minimize all expenses. Often electricity is not available, machines are running on diesel or petrol, and the less power is used, the more in...
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2054
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Started by NOBRAINER
Hello i am from Indonesia, We currently had a bulk of about 500,000m/t oxide ore grade from 0.4-0.7grams per ton, there is no visible gold. At first we plan to do dump leaching but the test show only 35 percent recovery and after crushing to minus 1 ...
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Last replied to by Todd H
As the previous post indicated there are ways to concentrate the gold but it will depend on the mineral association.  Ores can be sorted or concentrated exploiting any number of characteristics; colo...
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1576
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Started by katbilly
Hi, we have Merrill-Crowe Process and we refine the gold precipitate with induction furnace. We use; 40% Borax, 30% Nitre,15% silica We have many problems with the stability of slags, after just one hour in induction furnace, we have a foamy slag e...
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Last replied to by Richard S
The large amount of niter that you are using is likely contributing to the foaming.  Why do you need so much?  Do you have sulfides present in your concentrate that you are smelting?  It you don't ...
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1748
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Started by Scotman
Good day. Does anyone have any experience with the recovery Ta using a diamond pan (rotary pan?) Apart from spirals and shaking tables, what other methods are commonly used>  
Last replied to by Treve Mildren
Hi Scotman. I am building mobile equipment at the moment for the recovery of fine and ultra fine Coltan for use in Rwanda. I think I can help you here. An old paper to give you some idea of the techn...
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1437
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Started by MineralFrothFlotation
seeking solution to separate dolomitic content from Attapulgite through dry beneficiation technique .  Input attapulgite : Dolomitic content 35-40% Final product should have dolomitic content < 5% . Is it possible through dry processing ? Pl...
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Last commented on by MineralFrothFlotation
Thanks a lot Robert .... I think this the very cost effective solution for the same ,
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1439
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Started by GhanaBob
Dear Colleagues, We have just fire assayed our gold room concentrator tailings and it showed great losses, most likely due to a worn cone, low water back pressure and dirty water.  We have almost two years of tail dumps that now require reprocessi...
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Last replied to by Dario L
I think you could send a laboraotry of University o Center of research to evalute the recuperation and metallurgical test working and evalute the grade of the material beacuse I think these material n...
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2170
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Started by GhanaBob
Hi All, I just received our sample tests back by SGS and I need some help in understanding the fire assay weights measured in Grams/Ton and backing that into  what we are measuring in our placer op of Grams/Cubic Meter. Can I just divide the Ton n...
Last commented on by GhanaBob
got it!

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