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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3257
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Started by Oberstorm
Any idea to maintain pH on leaching tank that is relatively high (chemical reagent added will not give negative effect on leaching performance)?Our plant is having problem with high pH of leaching. Based on our lab test, optimum pH is on range 10.3-1...
Last replied to by Amaila Tahir
why pH increased during leaching of copper take place from waste materials? why redox potential decreased when pH of the reaction medium increased during leaching of copper ?
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Started by emanus
hello metallurgist; please, what is the function of iron (Fe) in gold leaching process with thiocyanate as a Gold Dressing Agent composition?  
Last replied to by Unterstarm
Thiocyanate as a leaching agent for gold has been studied by many. The overall reaction for gold dissolution by thiocyanate can be written as: Au + 2SCN- + Fe+3 ⇔ Au(SCN)2- + Fe+2....................
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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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2020
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Started by Mikhail
Who knows about the cyanide reagent substitute Flotent Gold SC 570? I have a substitute cyanide. Flotent gold SC 570. Anyone doing research on leaching with its use? I have a problem with the definition of its solution. The technique is said that he...
Last commented on by Mikhail
Вы можете связаться со мной по электронной почте pinyasov.estageo@mail.ru
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2019
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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 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 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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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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1302
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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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667
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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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838
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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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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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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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733
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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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2545
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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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541
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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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1494
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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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851
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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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1940
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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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Started by Seeker
For gold dissolution in Sodium Thiosulfate solution, I have to add FeEDTA at a concentration of 0.002 mole/L. I have with me Ferric sulfate and EDTA (Ethylenediaminetetraacetic acid) separately. Please advise me how many grams of ferric sulfate and E...
Last commented on by Seeker
Thanks a lot for your advice. Could you please suggest a simpler way for this?
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Started by Nyasha Jawanda
Hi What are the metallurgical issues considered when planning the construction of a heap leach for gold in oxide ores.
Last replied to by David
Hi Nyasha and Welcome, to complement to Jorge's comment, please see: http://technology.infomine.com/reviews/heapleachpads/welcome.asp?view=full and https://www.911metallurgist.com/blog/heap-leach...
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656
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Started by max skinner
What cubic foot per minute vacuum pump is needed to deaerate a 10 cubic foot tank to 20 inches of Hg with a flow rate of 50 gallons per minute.  
Last commented on by max skinner
Thank you, I will try 30-35 cfm
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Started by Seeker
Kindly explain following points about gold leaching with thiosulphate from gold plated processors What is the ratio of acid to acidify the solution for gold leaching with sodium thiosulphate? Which acid is best to acidify the solution? What compound...
Last replied to by
Hi Seeker and welcome, have you seen https://www.911metallurgist.com/blog/sodium-thiosulphate-gold-leaching
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Started by tihisha sabur
Our plant is gold processing plant contains a ball mill and knelson gravity concentrator , pre-leach thickener .CIL, CCD. For time being our gravity concentrator is not working. . 1. which is more precise the ball mill feed or leach feed (pre-leach ...
Last replied to by Jorge
About your questions, I can say that the ball mill fresh feed should be considered to determine gold feed grade to the leaching process. If you want to evaluate the CCD circuit, you should take sample...
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Started by New Era
my problem is we don't have tailing and concentrate at same time , we feed solid gold to the leach tank , i can calculate how much gold i have leached , this does not include the amount of gold lose in solution form . now i am using this formula ...
Last replied to by Bhaduri
Sometimes it is easier to explain concepts thru' a worked problem...let me know if the appended example makes sense in attempting to answer your query.
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Started by Mikhail
What do you think is necessary to conduct tests CIP / CIL process ? What information would be most useful for the results of laboratory experiments? As in the laboratory to simulate a continuous process of CIP?
Last replied to by David
Hello and welcome Mikhail. Thanks for your great input Jorge. Mikhail, you may want to also review: Cyanide Bottle Roll Leach Test – Leaching Procedures Cyanide Gold Extraction Process ...
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Started by Maya Rothman
I was wondering if anyone has had experience in heap leaching of gold ores with sulfur content ( 0.1 to 1 percent)Some suggestions for pretreatment or treatment of such ores by heap leaching process.
Last replied to by
The best recommended method is CIL/CIP to recovery gold in a sulphide ore and you must design condition tanks for per treatment of sulfur, in this condition tanks you must dose lime of at least 12 pH,...
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Started by Rahil Khan
What effect do flotation reagents have on activated carbon during gold adsorption? Do they have an effect or not? If yes, then what effect do they have?
Last replied to by Sturmbann
Search for work done in the mid to late 80's by AMIRA in Australia, they did a mountain of work on all the different types of fouling agents for carbon, including all types of flotation collector, fro...

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