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 Ching Chong
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?
Last replied to by David
Hi /dbouchard/ You say “we took over”. Did you actually pay for this before figuring out what to do with it? Really? No pre-purchase testing? Due diligence? You said "It was abandoned three ye...
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Started by KRISHNADAS
Hi We are planning a VAT leaching for HMS rejects of copper oxide ore. We are stuck at design and would value inputs. We are planning for a 5000 tons holding capacity for the VAT and feed grade is 1% copper. Size of feed 100% passing 20 mm. Would the...
Last commented on by KRISHNADAS
Thanks
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Started by MarsV
are these methods (https://www.911metallurgist.com/blog/procedure-method-activated-carbon-testing-program) still being used today as procedures for testing activated carbon?
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Started by hulk
Hi! How are you? I need to optimise my carbon concentration profile. How to estimate a optimum carbon transfer time in CIL circuit if i don't know my transfer pumps flow?  Thanks
Last replied to by David
Hulk, for now review: https://www.911metallurgist.com/hydrometallurgy/carbon-movement-study/ https://www.911metallurgist.com/blog/gold-circuit-carbon-sampling-inventory-movement https://www.911met...
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Started by Charlie
We are experiencing an unusual issue at our plant. Firstly the Merrill Crowe is still not recovering. The solid in the leach tank are very unusual. Leach tank 1-4 the grades are 1-1.5 g/t but in leach tank (the last) 5 it is 26 g/t. We believe that t...
Last replied to by Charlie
Sorry for the late reply. We have turned the plant off and have flushed out the entire plant. We believe it was carbon in the plant that have caused the issue. Only yesterday were we able to turn the ...
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Started by Adimulu
We had cyanide spill on the ground soil containing free cyanide of 10ppm. Could you help me what type of chemical do i have to use e.g hypochlorde..or any other chemical to kill the cyanide,excavation is impossible.  
Last replied to by Paul Morrow
If up were to "wash away" the spill with water, would you be able to recover the seepage water? Here are 2 papers you need to read to better understand your options. It offers cyanide treatment & des...
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Started by Plamen Georgiev
Dear colleagues, please give me any recommendation or suggestions about suitable laboratory filter press for processing of pregnant leach pulp generated during bacterial leaching of final copper slags in a bioreactor. We need to use this equipment...
Last replied to by Plamen Georgiev
David, thank you for the share link!
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Started by max skinner
I am looking for a ion exchange resin that will pull zinc out of a 15% sulfuric acid solution.
Last replied to by David
Hi Max, my SX expert friend says "Why use a resin, conventional SX for zinc should work…high acid content though". PDF attached.
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Started by McPaul
Hie l am a student in metallurgy and l want to do a project on agglomeration of vat leach ore using cement and lime. can l please have help with experimental procedures that l can use.
Last replied to by David
Here is a study a friend prepared (2 PDFs attached). It may be useful to you. Page 49 of the Thesis. Experimental Procedure: A plastic drum mixer (cement mixer) that rotates at 20 RPM and with 5 deg...
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Started by Cindy ccindie1994
hello  I am doing a project on the effectiveness of bottle rolling cyanidation method for low grade samples over the Fire Assaying method. So I would like to ask how well can I carry out the bottle rolling test works,the methodology and proportions...
Last replied to by Siddiquf
The name of this method is Bulk Leach Extractable Gold or BLEG. Search for it and you should get the information on the technique and it's limitations.j
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Started by M.H
Hello everybody. Does anyone have ideas about formation of lumps in the copper heap leaching?
Last replied to by M.H
These are two pictures of two copper heap leaching. All the circumstance in both heaps are the same but as can be seen in the right picture, They have been made agglomerations in the right heap while ...
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Started by GonDamm
In the topic labelled "Solvent Extraction Plants: Thiele Diagram & Theoretical Design Aspects" it is mentioned that a computer program (software) has been developed by I.C.I./Acorga to perform iterations for obtaining desired raffinate levels and st...
Last commented on by GonDamm
Ok. Got it. Thank you very much
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Started by Youssef ETTAAJ
which is the most expensive of those : zinc metal or the zinc oxide powder? when i searched on the net i found its price much close? if there price so close why we use the hydromettalurgic process after pyrometallurgy to extract zinc from zinc oxyd...
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Started by Alex Loutou
Dear Colleague, I work with CCD where tails with 50% solid with cyanide content dumping to detoxification. I plan to increase the % solid to 90-95%. The objective is re use solution cyanide mean reduce cyanide feed to detox. How I can get it with ...
Last commented on by Alex Loutou
Thanks for helping CAD,
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Started by Goldsing
I would like to understand the Cold Caustic Cyanide Pre Elution Wash methodology for assistance in removing excessive Copper when/if a problem? Is this a simple 'washing' process or is the process complexed i.e Different equipment and circuit require...
Last replied to by Richard S
You can remove copper with the same circuit as set up for elution of gold but you will need to have a separate solution that contains the removed copper and subsequent removal steps.  Copper removal ...
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Started by priya
HI, we are currently working with the project of processing fly ash (source Venezuela) and producing vanadium pentoxide from the same. We are fusing fly ash with sodium salt and then leaching the resultant to produce AMV and then vanadium pentoxide....
Last replied to by David
I am aware of an additive used to treat coal firing combustion chambers so that the Vanadium Pentoxide becomes friable and easily removed from the interior surfaces. It may be possible that this same ...
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245
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Started by Kent_725
Is it normal to have a value of  4 to 9 g/tons of Au in CIL Tails? The plant has BIOX process and the ore sample is mineralized as sulfur sulfides-molybdenum. Which part of the process has problem since CIL Tails is considered to have low Au.
Last commented on by Kent_725
To Richard, I think all you've mentioned is right specially with the feed sulfides. Feed lately was just 0.3%S and the requirement should >1.8%S. Theres a possibility that bacteria will die or cann...
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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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249
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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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206
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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 benmuntean
Hi Richard, Check system pumps. Which type of pumps do you use? I recommend peristaltic pumps with VSD and cheek diameter of pipes
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255
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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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274
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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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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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131
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Started by BBM01720
Hello. My plan; Dilute sulfuric acid bath Hot Sulfuric 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 and man...
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243
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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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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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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 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 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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123
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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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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 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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