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

Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction2017-04-04T06:57:36-04:00
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Started by PEKYEEPE
Am supervising a CIP circuit with 6 adsorption tanks. Due problems in the trash screen, the grits (coarse sand > 800 micron) are retained in the tanks. Our aim is to use knelson concentrator for the separation of grits and activated carbon. In th...
Last commented on by tgraham@minsep.com.au
Hi David - interesting comments above. We have both coarse carbon >1mm and fine carbon
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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...
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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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.
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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Started by Nyasha Jawanda
Hi, I would like to know ways in which i can increase gold leaching efficiency and percolation rate in heap leaching using cyanide?  
Last commented on by David
how to increase heap leaching efficiency
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2094
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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?
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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1214
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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...
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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1038
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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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Started by kenyaAurefiner
Hi everyone. Recently my friend and I came across some 30 year old tailings - about 1000 tons - which was analyzed to contain mainly 0.002% gold and 3.35% ferrous materials. I have no experience in gold processing, but my friend has some. He seems to...
Last commented on by labalkeny
hello all. What about the option of using hypo chloride or thiosulphate to leach what ever concentrate he would have come up with. can any body shed some light on the two suggested processes"
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Started by Charlie
What is the typical % solids you would generally run a CIL circuit at? Thicker will result in more retention time but does it leach gold or silver as effectively? Any negative impact on carbon? Thanks
Last commented on by Ahmed
I am working with an average of 42% solids, and we are facing a problem of carbon settlement in the bottom of the tanks. what are the other factors that can cause this problem
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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...
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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830
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Started by Nyasha Jawanda
hello guys...im a metallurgy student currently attached at a heap leach practicing company mining oxide ores(low grade ores).we use cyanide for the leaching process and carbon in the adsorption section..we are currently experiencing  low recoveries ...
Last replied to by ThabisoKwenane
Check if your cyanide distribution into the heap is even. Also check your particle size distribution. You don't want to have the same size of particles throughout your heap. A varying distribution wil...
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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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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.
Last replied to by ThabisoKwenane
Yes. You can try using ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometry)  
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655
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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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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...
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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1064
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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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860
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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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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?  
Last commented on by Andrew Eden
It looks like its worth a shot. Cheers inOr.
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1971
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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 ...
Last replied to by Jorge Quintanilla
Dear Papamet 26, could You describe your flowsheet please? 
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1376
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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 ...
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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763
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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
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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921
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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...
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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659
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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...
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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3164
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Started by Nathan
Hello All, I work in a CIL plant, processing oxide ore with more and more intrusion of sulphides (fresh ore body). The plant is designed for oxide ore but we noticed that at a certain blending, the transitional ore could be processed. It impacted on ...
Last commented on by Paul Lingei
Where is the best location to add oxygen (from hydrogen peroxide)? Can it be added at the head of leach tanks? Or into leach tanks?
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820
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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...
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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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...
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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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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Started by Arnmax
Currently in our gold plant we are getting a huge change in activated carbon in circuit inventory  during opening and closing stock from time to time. Now I have been given a project on carbon movement study in which I will investigate possible ways...
Last replied to by Jorge
It is well known that active carbon is lost by attrition and abrasion during the adsorption process, and also when is pumped, transported, screened, burned and regenerated. Abrasion tests involve sub...
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589
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Started by ramine
i am student and work in geometallurgical modelling in heap leaching of cu ... can you help me and give me your idea?
Last replied to by
Thanks Jorge. Hello ramine read and be sure to understand all of https://www.911metallurgist.com/blog/geometallurgy-course
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Started by Gombera
Dear Professionals, what are important steps should I follow when I want to design copper agitated leach tanks? Cheers, Heri
Last replied to by Marshal Meru
Also see https://www.911metallurgist.com/blog/metallurgical-testing-lpf-process  https://www.911metallurgist.com/blog/copper-lpf-leach-precipitation-flotation-process https://www.911metallurgist.c...
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Started by Helena Russell
Conditioning of an ore pulp is understood to mean its preparation for subsequent treatment by cyanidation or by flotation. Is it real an important step? How do you best go about it? How long?
Last replied to by CHIKWAMO
f your feed throughput to the leach agitation tanks is 2500 tpd (104 t/hr) and the ore feed is @ S.G of 2.6, how do you work out your required thickener volumes downstream?  
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Started by Greg OConnor
Hi all, I have a very simple question for which I am having trouble to find an answer. Can anyone direct me to studies which compare the leach rates of chalcopyrite with other copper minerals - particularly sulfides? There seems to be plenty on cy...
Last replied to by David
Hi  Greg, I am waiting on input from a friend on this. From now this may guide you a bit: https://www.911metallurgist.com/blog/acid-solubility-copper-mineral-species  
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Started by kahonde
kindly asking what are the factors affecting activated carbon adsorptivity? does cyanide strength affect  carbon adsorption and if so, what concentration?
Last replied to by Bob Mathias
The major physical factors affecting gold adsorption onto carbon are: Carbon type Carbon particle size Mixing efficiency Slurry density Temperature Gold concentration in solution Cyanide...
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Started by max skinner
I would like to separate zinc from manganese out of a 20%  sulfuric acid leach solution, any ideas? 
Last commented on by Bhaduri
Try 28% ammonia...sufficient to neutralize acid, precipitate Mn as an aqua hydrate & solubilize Zn as the tetraamine complex...
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Started by
Can you cyanide leach gold when oxide copper CuOx is contained to an approximative 0.3% Cu and Au is 10 g/t?
Last replied to by Colette
Bill Copper oxides normally leach pretty well in cyanide solutions - you can see how well here https://publications.csiro.au/rpr/download?pid=csiro:EP112080&dsid=DS2 You are definitely in the "it's...

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