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

Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction 2017-04-04T06:57:36+00:00
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Started by mashudu
our final gold bullion contains about 19% of copper whist gold fines is 65%. i would like to ask as to what flux composition can we use to reduce such high copper in the final bullion .
Last replied to by Paul Morrow
https://www.911metallurgist.com/effect-base-metals-gold-bullion-assaying/#How_does_Copper_Affect_Gold_Assays
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Started by Alex Loutou
Dear Mets Expert, What is the optimum pH in MC process, is the ratio of gold-silver affect in the MC process? Thak you.
Last commented on by Alex Loutou
Thanks for your explanation Richard, its helpful. The pH even up to 11.6 because using lime to improve clarity in CCD beside lime in hpper clarifier. Rather hard to maintain pH at level 11.2 as long a...
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Started by Tesaygo
I have a lot of source of copper-gold ore, but my problem is am only knowledgeable on mercury process to get the gold and simple cyanidation technique. Ive already try to leach copper-gold ore, but it seems that the consumption of NaCN is too much th...
Last replied to by David
Yes, copper will consume cyanide. What is your question? Do you have any data to provide us?
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101
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Started by martie
Hi there I need help with a laboratory procedure for gold leaching with cyanide please
Last commented on by martie
Thank you
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72
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Started by cleo
we currently run a pressure zadra elution circuit. our GIC stocks (tanks stocks only) have been steadily increasing as a function of increased head grade. if I were to install a second parallel elution circuit, I would be able to maintain a lower GIC...
Last replied to by Jorge Ganoza
Technically, you can add a second elution circuit to operate in parallel with the first one. I think, it is necessary to make an economical evaluation to know the impact of the investment on the opera...
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Started by hulk
hello ,what procedure can i use to test quicklime/hydrated lime quality from the manufacturer?thanks.
Last commented on by hulk
thanks David
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49
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Started by johncramos
Please I´m working in copper leaching project in a laboratory from Peru, and need some information about determination of free acid in the presence of hydrolysable cations by titration. In the test I use Fe(III) ions like catalyzador. please i wait ...
Last replied to by David
Free Acid Titration ProcedureFill burette with NaOH (0.20 N) * Place 50ml distilled H2O in beaker While stirring add 5ml sample to be tested Add KI until solution turns clear red Add 200g/l Na...
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Started by COPM Kisadag
It has long been known that using galvanized metal in cyanide circuits should be avoided due to the tendency of the zinc to dissolve and precipitate gold. I am looking for links to articles on the subject that can be used to educate tradespersons an...
Last commented on by COPM Kisadag
Thanks Jorge.
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Started by ely.thar
When leaching coal fly ash using sulfuric acid, is it possible to leach iron instead of REE elements, if so how can we selectively leach the REE instead of the iron elements?  
Last commented on by ely.thar
yes we maintained the ph of the samples to 2.4 but were not sure if we really leached REE's in the CFA
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Started by pk_plus
I would like to know the effects leaching time can have on recovery of gold?
Last replied to by Pabloski
This is the best I could do
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83
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Started by biteyaboy
I want to leach concentrate that has been upgraded by shacking table and mercury has been used to extract gold in the same Conc. I have this concentrate now i want to leach them in Acacia plant with Leach Aid, NaCN and maintain PH of 12. Then after s...
Last replied to by David
Hi, see https://www.911metallurgist.com/hydrometallurgy/leaching-of-gold-ore-containing-mercury/ https://www.911metallurgist.com/hydrometallurgy/cyanide-leaching-of-mercury/ https://www.911metallur...
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Started by omer.canieren
I'm a Phd student at mineral processing department. And I'm trying to find a new topic on encountered problems in gold extraction process. Did anyone of you advice me?  What is the biggest problem in this regard? Thank you for your interest. Rega...
Last replied to by Pabloski
Carbonaceous minerals in the leaching feed, more commonly known as natural activated carbon can carry low recoveries during the gold exctraction. Two phenomena can happen when having natural activat...
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Started by omer.canieren
Hello everyone, Did anyone of you use the chloride as solvent in order to extract gold from the oxide and sulphide bearing gold minerals? Thanks for your intrest. Regards.
Last replied to by Deano
When leaching ores the variation in chlorine requirements between batches is always the great unknown. To allow for possible component ranges an excess of chlorine is used. In small scale operations...
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290
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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 🙂
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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Started by kudzisa
Which ion exchange resin is the best for processing gold rich solution from a heap leaching process of oxide rich Banded Iron Formation.
Last replied to by Billy
Hi Kudzisa.....I have use Minix and Purogold before....both are working good and has their own advantages.....Minix more selective to copper and less attrition rate while Purogold has bigger loading c...
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Started by Rob.Earth.20
Hello,I tried to make thermite reaction with crushed manganese oxide ore, so the manganese oxide could become a pure manganese without oxide. I want to ask if I could separate the pure manganese from the aluminium? Can I dissolving the aluminium oxid...
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Started by Irene Ibz
Hello, I work in a plant where there are a lot of carbon losses of about 7 to 9 tonnes per month.. Now I have been given a project to minimize the carbon losses and of course I know carbon is lost due to attrition losses in the agitators, kiln, due ...
Last replied to by SIMetallurgist
Hi Irene, Some more things to try, attach a 20 mesh screen to a sampler and dip it in the launder of your last CIP or CIL discharge going to tails. This will show if you have carbon losses coming out...
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Started by nyala89
I hope somebody on the group can help me. I'm looking for learning material in carbon management. I'm developing a course in carbon especially carbon in pulp and carbon in leach. i'm in need for  assessments as well as learner guides. Please if so...
Last commented on by nyala89
Thank you much appreciated
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56
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Started by peyman
what is the hydrolyses role in carbonization process ?
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132
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Started by nicolas
hello, i operate a gravity vat leach plant, i treat tailings from artisanal workers after recovery of free gold. I got twelve 30 tons tanks. As tails are argillaceous, i melt 15kg/ton cement to pelletize the tails . What flow rate do i need in tank ...
Last replied to by Jorge Ganoza
If you don't perform a testing program to evaluate operating parameters, the gold extraction would not be as high as you want. It is important to evaluate the pellets too. You can try 30 l/h/m2, you c...
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Started by Fabian Rebolledo
i would like to know if someone knows about technologies that can measure the organic entrainment in copper solvent extraction without lab tests.
Last replied to by David
Typically two ways, most common is a dairy centrifuge tester see link of typical unit; https://www.indiamart.com/dairy-instruments/# Also used in a Horiba IR tester that uses infrared and special so...
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198
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Started by Mahmoud Abdelmonem
Hello I have never work in gold processing. I'm trying to understand how the circuit of the CIL process goes and the flow of ore and cyanide and carbon in it , but still somethings confused in tank design. Suppose there are 4  tanks . The ore ent...
Last replied to by Ashraf Ali
Dear mr Mohamed I have same project and I face some problem , can we discus this issue if you want can chat WhatsApp 00966535646526 
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Started by Sandeep Bisht
Over a week and a half, the dissolved oxygen content of my flotation concentrate carbon-in-leach tank drops by 80% to around 5 ppm. My gold recovery is still OK at almost 90%. This is a batch/Vat setup.   What could explain the oxygen being consu...
Last replied to by Charlie
Hi Sandeep, I saw something similar discussed elsewhere and here is what they say: Susan (Sue) Ritz This sounds like a mechanical problem to me. Do you inject directly into the tank or do you have a...
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Started by SDHILLBILLY
I have been experimenting with direct smelting and sulfuric acid leaching/electrowinning of oxide copper/silver ores on my property. My great grand father used direct smelt 150 tons per day. I Would like to setup a pilot process of 4 to 8 tons per da...
Last replied to by David
Some processing ideas: https://www.911metallurgist.com/blog/heap-leaching see the last 3 PDFs at bottom https://www.911metallurgist.com/blog/agitated-copper-leaching-ore https://www.911metallurgist...
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Started by Mikhail
Hello colleagues!Anyone can suggest a method of laboratory research of ores before heap leaching? I am interested in the method of determining the height of the heap. I saw a device that allows you to simulate a column of ore height of 9-12 meters. S...
Last replied to by Rheomet
Hi Mikhail, I suspect that you are rather looking for percolation response, as heap leaching specifically precludes the need for filtration, that being its key benefit. Complete Heap leach testing  ...
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Started by Irene Ibz
Hello, apart from arranging regular screen maintenance, how can I check for interstage screen leakage manually during the shift?
Last commented on by mashudu
no carbon is suppose to be visible when you do the check on the discharge sample, if any carbon is visible it will mean : 1. if its finer than the screen appeture it will mean you are creating fines i...
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Started by Rob.Earth.20
Can I make a Copper Sulfate solution with this unknown copper ore and sulfuric acid without using a burner or roasting? How?  Can I just using a crushing and just directly dissolving the copper using the sulfuric acid? Thanks
Last commented on by inOr
Rob. I don't know the answer to this question. The only chromium ore I know of is chromite, Fe Cr2 04. The chromium in chromite is trivalent (in the +3 oxidation state.) and not terribly toxic. Ho...
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Started by Wadzanayi
I would like to know how I can modify the cyanidation process to leach a gold ore which has got the following characteristics:  Au grade 3-4 g/t   Hg grade  1-2.5 g/t  Cu, As,Sb grades: trace FeS: trace The ore has produced unsatisfactory r...
Last replied to by Auexplorer
I am curious, Please excuse my question, Why the amalgamation circuit when grinding to 75 micron, seems like an extra circuit. Any free_mill material would be caught in the grinding and classification...
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Started by Colin
We are in the process of building a VAT Leaching plant and I have just received the 32 element test from SGS with a breakdown of the elements. The As and S content look a little high so I was wondering if I need to pre treat the tailings before loadi...
Last replied to by David
Colin, the 0.7% Arsenic you have may be enough of a leachability roadblock but it does not confirm it 'the problem'. The Influence of Arsenic in the Cyanidation of Gold Ores is explained by W. B. B...
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Started by Parmanand
I want to recover gold and iridium from element with below combination. CU - 63% Ir - 17.61% Ag - 16.20% Au - 3.04% Nickel - 0.13% Mercury (Hg) - 0.002%
Last commented on by inOr
From what I read, it looks like the cyanide waste is deliberately acidified to drive off HCN gas. Like they say, do not try this at home. I can see why doing so safely requires a substantial investm...
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Started by Ozgun
    In HPAL (High Pressure Acid Leaching) of nickel, pressure leaching is used to be done in pachuka tanks but it has become obsolete and instead of pachuka tanks, titanium lined autoclaves are being used. From a technical point of view how can tit...
Last replied to by Rheomet
If you are referring to laterite Ni-Co leaching, HPAL is a well established process (Moa Bay, Murrin Murrin, Coral Bay, Ambatovy, etc.). It is essentially an acid digestion, but recovery is increased ...
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Started by vekian
I have years of hands-on experience on various CIL/CIP plants but the one I am currently at have an almost manual process of when a carbon pull has finished from the 1st carbon tank (usually about midnight), to straight away transfer carbon from the ...
Last replied to by Jorge Ganoza
I think the first tank collects more gold because it receives fresh slurry from the grinding or leaching circuit. In one operation, when we started up the operation, carbon was added in the first tank...
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Started by Irene Ibz
hello, In our plant there are carbon which were dumped back then, they are known as reject carbon. These reject carbon consist of grits. In order to save the cost we have decided to reuse these carbon in which their activity is about 12% and they ha...
Last replied to by Vault Dweller
Another option for separation could be; if you already have a Gemini or Wilfley table set up, or access to one, you could possibly split the carbon out. Or if you could rig an old cyclone up with the...
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Started by kahonde
hie, can caustic soda at pH 12 affect carbon adsorption of gold ?
Last commented on by kahonde
we sometimes reach pHs of around 12,let me read the pdfs thank you.
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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...
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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