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 martie
Hi there I need help with a laboratory procedure for gold leaching with cyanide please
Last commented on by Joeram
Jorge, Hi I am new to all this. I have tried smelts and acids. i have assay's. Ok I read this above. I have arsenic and sulfides with micro. If I add to much cyanide then more zinc is needed to precip...
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Started by Mshindo jr
I am currently working as a graduate metallurgist at Anglo-gold Ashanti - Geita Gold Mine in Tanzania. Regarding the sulphide nature of the ore we treat at the plant, we normally add Lead Nitrate so as to suppress the Sulphide minerals from been leac...
Last commented on by APATITE
Am interested with topic, am Tanzanian student and I need your support if you don't mind
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Started by NOBRAINER
I had gold ore tailing which had been mercury amalgamated assay at 2-5g. I had do a leaching test and in the first 2 hours the recovery reach 90% and 12hrs at 75% and 24hrs at 64% and finally 52% @ 48hrs. The FCN is maintain at 1000ppm. The carbon co...
Last commented on by benmuntean
Try to wash the ore and after that make again RollingBottle test
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Started by mebrahtu
could you please offer me any idea,suggestion or any exprence with the similar problem before. as usual operation  we take 2 samples, one from cil tank3 and the other from harvested loaded carbon from cil3 at at the same time but the result is diff...
Last commented on by benmuntean
Hi all, You have good point of view. But question is, which type transfer pumps are used? Mebrathu, try to take a sample with airlift pumps, scale manufacture. in different points of the tanks.and dif...
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796
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Started by alaz
hello everyone i am an operator in gold plant and i would like to ask some question and i hope i will find the answers for it: our CIL tanks are  3000 m3  1- what is exactly the O2 does in CIL circuit 2- why is the total cyanide available ...
Last commented on by benmuntean
Hi Alaz and Richard, My experience, best recovery of gold and silver have when level of oxygen is over 8 ppm. In standard operation with out any interference. Very clearly you can see in lab when you...
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Started by kahonde
i have a heap and i want to cyanide leach it for gold, i want to ask how long do you irrigate the heap before you send the pregnant solution for adsorption.
Last replied to by Samuel Trindade
The heap leaching works irrigating it with cianide solution. The solution flows through the heap and feed a pregnant solution tank than goes to adsoption on activate carbon. The solution after adsorpt...
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Started by priya
what can be the possible methods for removing sulfur from molybdenum trioxide? if its content is higher than the desired value for producing ferro-molybdenum.
Last replied to by priya
can you please elaborate  more on Brenda Mines? 
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572
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Started by mehr
Dear friends I use D2EHPA/Kerosene for zinc/nickel separation and using caustic soda solution for pH adjustment, unfortunately after 10 cycle extraction/stripping organic phase became dark and loading capacity decreased. Also phase separation need mo...
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486
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Started by BBM01720
Hello. My plan; Dilute sulphuric acid bath Hot Sulphuric acid bath Silver refining nitric acid Lead removal with acid/H2O2 Gold refining aqua regia Does this sound usable for ore containing; copper, gold, silver, pyrite, iron, lead, zinc a...
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768
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Started by priya
to produce vanadium pentoxide from sludge by ammonia leaching method, can anyone please make this process more clear in respect of metallurgy and certain methods for increasing yield of vanadium pentoxide, removing unwanted trace elements like sulphu...
Last replied to by priya
THANK YOU MIKE.CAN YOU PLEASE GIVE A CLUE FOR REDUCING PHOSPHOROUS CONTENT FROM VANADIUM PENTOXIDE PRODUCE VIA ABOVE MENTION METHOD? Or more particularly from methods for reducing phosphorus content ...
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800
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Started by Ahmed Zaky
Hello i want to use zinc for gold recovery from leaching solution where i use vat leach method  , what is zinc shavings and how can i use it ( picture of zinc shaving if it is available)
Last commented on by Ahmed Zaky
thanks for reply but how i can remove DO from solution and please show me how zinc powder is used either by passing solution on zinc as active carbon in cells or by stirring zinc powder directly wit...
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519
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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 Mikhail
In order to help you, you need to know how much copper and gold in the original ore? How do you process the ore? Agitation or heap leaching? Phase analysis for copper and gold. Based on this data, I c...
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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 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
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
1
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642
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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 Procedure Fill 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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478
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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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405
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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...
2
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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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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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401
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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...
5
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784
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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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Started by peyman
what is the hydrolyses role in carbonization process ?
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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
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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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 Charlie
We have a heap that we are planning to leach. The heap contains silver bearing ore. The pH of the heap is at pH 3. we want to raise the pH to 11 before we start to add cyanide to leach the silver. What is the best possible chemical to use?

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