Gravity Separation & Concentration Methods

Gravity Separation & Concentration Methods

  • 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.

2
REPLIES
778
VIEWS
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...
m
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...
3
REPLIES
2062
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...
S
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 ...
2
REPLIES
901
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 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...
3
REPLIES
2257
VIEWS
Started by ramoah
I have recently come across a small deposit of COLTAN in Africa. I am looking to start a small scale processing plant to produce a concentrate and then separate the tantalite from the Niobium. Can anybody  point me in the right direction. Where can ...
a
Last replied to by nkotb
on this topic, is there anybody with resource on setting up a small scale benefication for tantalite?.
1
REPLY
730
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...
T
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
938
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
1752
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...
M
Last commented on by Makc
Brqnnn@gmail.com
3
REPLIES
1084
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.
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...
4
REPLIES
962
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
784
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
K
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
1859
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
935
VIEWS
Started by Tsaone
M
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...
8
REPLIES
1203
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...
r
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
1289
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.  
J
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
778
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...
R
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
925
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...
J
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
1415
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...
D
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
2149
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  
T
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...
5
REPLIES
1717
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...
R
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
880
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...
A
Last replied to by Anjani Kumar
Please anybody give me the necessary input.
2
REPLIES
1000
VIEWS
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...
J
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...
2
REPLIES
1449
VIEWS
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 ...
T
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...
1
REPLY
1024
VIEWS
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...
R
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 ...
1
REPLY
1173
VIEWS
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...
2
REPLIES
892
VIEWS
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...
A
Last commented on by MineralFrothFlotation
Thanks a lot Robert .... I think this the very cost effective solution for the same ,
3
REPLIES
871
VIEWS
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...
D
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...
4
REPLIES
1092
VIEWS
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!
1
REPLY
737
VIEWS
Started by GhanaBob
Is 1/8" thickness aluminum acceptable and sturdy enough  for my 1" x 5/8" riffles? Or should I use the  heavier steel gauge?  Thanks to all who can offer insights?
Last replied to by David
Hi Bod, i think an aluminium riffle @ 1/8" thick is enough to not blend or break. 
1
REPLY
932
VIEWS
Started by Blackbird
We're looking for a small feeder system to move ore onto our shaker table. Have seen a small (maybe 2' long) auger before at the Candelaria mine that was used to add lime to a slurry. Can't seem to find a source for them. Any ideas?
Last replied to by David
Capacity? Tonnage? Shaker table size?
4
REPLIES
1212
VIEWS
Started by Treve Mildren
What is the realistic feed capacity of a large shaking table ? I know the stated tonnages on the sales data sheets are rather exaggerated so does anyone have any real world numbers? What is the factor which decides that scale up? Logic would sugges...
F
Last replied to by Firon Woo
I know Chinese Shaking capacity ranges from 0.1-1.8mt/h of pulp. They never gave a solid capacity though.
2
REPLIES
927
VIEWS
Started by fotros
hello to everyone.I'm reasearching for the best tool for generation of manganese. which methods of gravity separation is better for the mine that have 12-18 grade manganese ore & it' Pyrolosite(MnO2).And after this method we reach to what grade?Than...
Last replied to by Treve Mildren
Hi Fotros. I am far from an expert in this field but I am conducting Enhanced Gravity testwork on another mineral at the moment. The Mets are using the Mn as an indication of the upgrade . The Mn is...
3
REPLIES
836
VIEWS
Started by huntonia
The gangue is dolomite and ore is malachite, chrysocolla and heterogenite.  
K
Last replied to by KRISHNADAS
Hi I am working in a HMS plant recovering malachite. Chrysocolla is difficult to recover, but not impossible. Heterogenite cannot be recovered as it is fragile. We have operated a 350 tph plant and...
3
REPLIES
1822
VIEWS
Started by Rob.Earth.20
Hello, I want to ask about the design of ore washing plant. Did anyone have a reference about manganese or ore washing plant. Thank you.
Last commented on by Rob.Earth.20
Halo Bang, saya di NTT bang. We have manganese oxide. The minerals formed in ofiolite complex. The other mineral are limonite, some scaly clay and flint. Yes we did some gravity separation, but the ta...
1
REPLY
1233
VIEWS
Started by Tererai
What do i have to consider when i want to optimize my scrubber? I'm have issues on tyres bursting and constantly changing gearboxes.  I know it has to do with the weight of the loaded scrubber but what else should i take into consideration in tryin...
B
Last commented on by Tererai
Thank you AJNeale so so much for the info. Will get back to you with pics
2
REPLIES
1562
VIEWS
Started by Michael Z. Papadopoulos
What is the minimum size of Chrome ore which is currently concentrated with Fine DMS?  
M
Last replied to by Michael Z. Papadopoulos
Size as in particle size please.

Please join and login to participate and leave a comment.