Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction

Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction

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2013
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Started by kahonde
hello i have been trying to vat leach a sulfidic gold ore using cyanide at 0.2% and a pH of 10.5-11 but gold of about 3g/t is still reporting in tails after 40 hours of leaching from a head of 5.88 g/t. HELP...vat leaching is the only method i can us...
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Last commented on by Joeram
Max, Hello. I hope you can help. Ok assay's and lab yes gold arsenic and gold locked in sulfides with micro. I have tried roast and smelt, nope a matte. Lab said a assay flux with lead, it worked but ...
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2810
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Started by evakahwili
Hello friends, Can someone please help me with the reason why leach solution turned blue in a vat leach tank and the possible solutions to it.
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Last replied to by Launcher27
This deep blue was coming from my tank with a heavy blue foam weakening the cynide.
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919
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Started by Louise
I just want to ask on how to calculate the harvest time of carbon in cyanide leaching. Its the time that the carbon will reach 1500 grams/tonne? The carbon loading is linear. Thank you for answering 🙂
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Last replied to by Goldman
Hi Louise, did you end up finding an answer to your question, because I'm looking for the same thing. Our set up is 2 Leach tanks and 6 adsorption tanks, will contain approx 3T of carbon in each ads t...
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2848
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Started by biteyaboy
Is there any method to check either sodium cyanide is expired or still OK? If yes what is the procedures?
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Last commented on by biteyaboy
Hi Badhuri, I have questions regarding above explaination 1) Why are we adding Naoh Pellet to NaCN solution? you did mention how many grams should be added ready to prepare the solution? How many gram...
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1683
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Started by ramine
hello i working in Crud Recovery in copper SX (solvent extraction) i separate the organic phase by bentonite clay then organic phase separated from crud ... i can load this organic to system ?
Last replied to by Farhad Baghery
Hi Kevin, Could you please explain your calculation? how many clays for how much organic?
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1191
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Started by Irene Ibz
hello, I have been given a project on carbon inventory and carbon activity improvement. Currently in our plant we are getting a huge change in carbon inventory in CIL circuit during opening and closing stock. Also the activity of carbon is lowering....
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Last commented on by Irene Ibz
Thank you so much wayne, but i also wanted to know how to minimize these losses on carbon. The history is that the open stock as per September 2016 was 100t, added carbon was 15t therefore required c...
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1226
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Started by Jaime Jacob
Hi my name is Jaime I'm trying to Learn modelling. I would like to model the moving the solution leach in heap leaching and may be the metal extraction. I have seen many of this studies of modelling in differente journals but only show some equatio...
Last commented on by David
READ https://www.911metallurgist.com/blog/heap-leaching and its +200 pages of PDF. 
3
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2040
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Started by girishchandra
Need help for recovery of copper from copper nitrate solution   
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Last replied to by mishaka
In order to recover copper from you just raise PH of your solution to 6 there you will have almost 90% of copper precipitated
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790
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Started by kahonde
hello i'm using vat leaching but im having a problem with the carbon absorptivity, usually we would get 1 kg recovery but these days we are only achieving atleast 500g. i have tried to use surf in hope to get some improvement, i'm yet to check the r...
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Last commented on by Wadzanayi
Surf (soap) contains sulfonic acid which is a an organic carbon foulant thus lowering carbon activity or absorptivity. The only best way to overcome organic fouling is to regenerate the carbon so t...
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1742
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Started by Dan88
Good day, I am trying to figure out the optimal flow rate for a large tank. I am used to 30 ton VAT tanks but have since started using a 150 ton VAT tank. I know that with a 30 ton tank the flow rate is around 5 l/min but if i use the same flow rat...
Last replied to by kahonde
0.1% is the ideal but if you leaching high grade ores you might need to use 0.18-0.2%  
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831
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Started by Biglizer
Hello everyone Is vat leaching the best method to extract high grade gold with coarser particle, if not why? What is the best method of extraction besides mercury amalgamation Thanks 
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Last replied to by max skinner
You will need to get the course gold out first, like anything larger than about 100 mesh. Course gold just doe's not leach well, very slow. As ace says above you can use Knelson or Falcon concentrator...
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899
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Started by Adelnini
Clay from ROM is 10%, and it contains 0.05% copper.. What should we do to clay before feeding to SABC? Can we still recover Cu from clay?
Last replied to by
0.05% copper = What does it matter THAT IS NOT ORE. On an industrial scale, clay is there to stay. 10% is bad news. What are you doing: Leaching gold or floating copper/copper-gold? Can you clarify......
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1097
VIEWS
Started by kenyaAurefiner
USING ACTIVATED CARBON: Hello there... Could someone help me with info about using activated carbon in heap leaching method. We have acquired goldix 570 and realized the recommended method by using activated carbon. Considering we have never used it ...
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Last replied to by Cyanide
Hello Adam, you handle Goldix just the same as if it were cyanide; from carbon loading to stripping.
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4444
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Started by Handerson
Gold Dressing Agent (GDA) product that has Chinese origin, meets environmental requirements and reduces the leaching time and energy costs and effluent treatment.Do you know any application on a large scale? I'm the product for testing, I know some s...
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Last commented on by McDeejs
your emai please
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2711
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Started by Mikhail
Dear colleagues Does anyone have any information on possible leaching of water amino acid solutions of gold, of peptides, proteins, nucleic acids
Last commented on by Mikhail
Thank you very much, I will be very grateful pinyasov.estageo@mail.ru
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2196
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Started by nurdyme
A mine is planning on increasing the leaching density from 40% solids to around 50% solids, with the aim of increasing the dissolution rates, although right now they are working at recoveries of 85%. what would be the effect on the kinetics of diss...
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Last replied to by nurdyme
FINISHED LAST WEEK  Leach test at different densities Methodology  Bulk samples of thickener underflow was used for the test work  All samples were done in triplicate  Pulp was made up...
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2062
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Started by ChemEngStudent
It will be much appreciated if i can get good articles or information about bioleaching of gold and how it differs from more traditional methods.     Thanks
Last replied to by
Gold extractability was measured by cyanide leaching in the same manner before and after biooxidation. Small samples of ground ore from shake flask experiments were leached by slurrying samples of t...
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1543
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Started by firebird
Hi everyone. I am now engaged in a CIL circuit. I tried to calculate my final gold bullion recovery after smelting but I cant. The problem is I had a total of 76kg gold fed to the grinding for 11 days.in the final circuit of the CIL a total of 4kg of...
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Last replied to by Greg Henderson
Reconciling feed gold with back-calculated gold based on change in inventory + dore gold + tails gold can be tricky as sampling of feed in a representatives manner is notoriously difficult, especiall...
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1292
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Started by New Era
Is there any test procedures to know the physical strength and adsorption ability of activated carbon for CIL application.
Last commented on by David
Wonderful Procedure & Method for Activated Carbon Testing Mr. Bhaduri. Thank you for this.
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1348
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Started by Wadzanayi
The unit operation consists of vat leaching of stamp mill dumps.The dump is created after artisanal miners surrounding the custom milling center have taken out their gravity gold. Sequence of events is as follows; Site began experiencing high sol...
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Last replied to by Mr_Weseni
Good day...  Mrs Wadzanayi please get in touch with me on +263717214189.... i am also facing that similar problem with our VAT leaching tanks.... Our head grade its 1.30g/t and our tailings are 1.10...
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1125
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Started by Nyasha Jawanda
hi guys what are factors that affect gold adsorption onto carbon in carbon in solution process.
Last replied to by
Activated carbon is used to recover gold from cyanide leach solutions, owing to its large surface area. There are 3 major mechanisms controlling the rate of gold adsorption onto activated carbon: 1...
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859
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Started by m16 mine
Is there anyway you can test presence of Gold in cyanide solution using handheld electronic instruments without the use of test tubes and chemicals.
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Last replied to by ThabisoKwenane
Yes. You can try using ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometry)  
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929
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Started by Dane Smith
I have a leach feed thickener with a serious over-flocculation issue. Has anyone seen any papers/ data on the effect of synthetic flocculants on cyanide/ gold leach reactions? I know enough about the flocculant/ particle bond to know there will alway...
Last replied to by David
Hi Dane, I looked in http://www.onemine.org/ and found nothing specific to the effect of flocculant on leaching rates. I just know that too much is bad... Here is what Marsden says.
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1646
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Started by makke
We are using steel tanks with of 3000mm diameter, 3600 height and a 2400mm cone at the bottom. Agitation through air at the bottom and 15 cbm of solution. we are looking for teh ideal slurry density (ideally 30 tons of solids) for an 18 hour agitatio...
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Last replied to by makke
I am sorry, I asked a question without giving all the information. we are not running a CIP or CIL. What we are trying to do is to retreat the tailings of artisanal miners without grinding. To date we...
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1369
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Started by Tumurchin
Does anyone have experience with leaching tin (cassiterite) from complex ores?  Any advise or referrals will be appreciated.
Last replied to by
Hello Tumurchin, I do not think leaching tin out of cassiterite or complex ores is possible. I think you can do Alkali leaching of tin slag but not cassiterite. Tin oxide does not get chlorinat...
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1393
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Started by Mikhail
Dear colleaguesBefore my company faced an interesting challenge to design a mobile unit for gold leaching. The set includes: car an agitator for leaching pulp, filter press, a container of water and carbon column. Also auxiliary equipment, pumps, hos...
Last replied to by Mikhail
Hello & thank you! Russia also welcomes all)) If we talk about the ore, the gold recovery in 10 hours leaching is 85-90%, the original content of about 3 g/t, this amalgamation tails. The reagent us...
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2931
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Started by Andrew Eden
Hello all, I have a 40% contained copper oxide with 7% tin contained in it. And about 20 ppm Hg. What is the best way to put the copper into sulfuric acid solution and leave the Tin behind as a solid. And what to do with the mercury?  
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Last commented on by Andrew Eden
It looks like its worth a shot. Cheers inOr.
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2474
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Started by biteyaboy
Currently we are processing our ore through knelson Concentrator to capture free gold, the remaining as tail we are keeping aside for froth flotation plant which is on commissioning stages. We’ve Acacia plant where our final concentrate treated as ...
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Last replied to by Jorge Quintanilla
Dear Papamet 26, could You describe your flowsheet please? 
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1679
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Started by New Era
Our plant is gold processing plant with 9 CIL tanks and 3 CCD thickeners and leaching hours are 36. I want your advice on we are calculating leaching and recovery based on leach feed and CIL tail of one day but practically the CIL tail represents ...
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Last replied to by New Era
Dear Colette Yes their aim was to wash the tail and reduce cyanide but due to water balance problem we are not using any wash water. Almost 10% of CIL tail water is returned back by the CCD everyday...
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1145
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Started by morgane
i would like to know what is the best way to leaching gold in hematite ores i have a microscopic gold  about 15g by tone of ores thanks
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Last replied to by Jorge
It is important to know if you performed any cyanidation tests to get some preliminary information.  Hematite is almost insoluble in a cyanide solution and the gold dissolution rate should not be aff...
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1219
VIEWS
Started by SaltwaterServr
First, hello from Phoenix, Arizona where we have all of the beach, but none of the water.  My real name is Jeff I've got several claims and about 6 more prospective areas near here that have promising looking gold ores on them, all refractory.  We...
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Last replied to by Bhaduri
A fine garlicky Italian dinner in the Pit reminds one of Arsenic & Old Lace...so be careful out there. Precious metals in their elemental state require an oxidizer...hence peroxide/HCl or Aqua Regia (...
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822
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Started by magwazasammy86
Hi everyone. We have a heap leach plant at our mine and we have oxide material from a mine dump.We are irrigating the using drip emitters sodium cyanide solution. The problem we are currently facing is that we are noticing the bluish-green colour at...
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Last replied to by Bhaduri
Likely prussian blue i.e. ferriferrocyanide or  Fe4[Fe(CN)6]3·xH2O - oxidation of Fe to ferrous in your dumps, reacting w/cyanide to initially form a color free compound ferrous ferrocyanide...
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1098
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Started by Steven Bigelow
Hi All, Do you have any thoughts on leaching an ore that runs high in both copper oxides and silver? We have about 100 tons of old mine stockpiles on our claim that assayed 4.0% copper and 8 ounces/ton silver. The copper minerals are almost a...
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Last replied to by inOr
The specific gravities of chrysocolla and malachite are ~2 and 4, respectively.  Cuprite (Cu2 O), which at a gravity of 6.1 is getting close to acanthite (a common silver ore)  @ ~7.2.  Native si...
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1705
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Started by Seeker
I have stripped the gold from gold plated pins of brass with a gold stripper with the following ingredients: Zinc tetracyanide Meta-nitrobenzene Sulphonic acid sodium salt Sodium Hydroxide Please suggest what would be the best chemical or che...
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Last replied to by Seeker
There was a little mistake in what I Posted. The gold stripper with which I stripped the gold from brass pins had following ingredients: Sodium zinc tetracyanide Potassium cyanide m-NBSS Sodium Hy...
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1620
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Started by Bob Mathias
What effect do flotation reagents have on activated carbon during gold adsorption?Do they have an effect or not? What effect do they have? Do these flotation reagents get adsorbed onto the pore of activated carbon or form a superficial layer on the ...
Last replied to by Paul Morrow
Hi Bob, It depends on the reagent. Carbon, being naturally hydrophobic, will float easily, with a frother and that could cause unwanted foam and floating of the carbon. Fuel oil based collectors will...

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