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 Philibert
I have been leaching gold ore which have also copper and Silver by using carbon in leach (CIC) leaching method. when i take pregnant carbon to elution at the end i found large amount of copper and silver, this means cyanide also dissolved silver and ...
Last replied to by Todd H
See this post on a similar issue: https://www.911metallurgist.com/hydrometallurgy/electrowinning-of-gold-copper-ores/ The adsorption of copper cyanide complexes on carbon is highly pH dependent. ...
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Started by Philibert
I would like to thanks for all members for technical support that they give to every question I want to start a new Vant leaching plant with one leaching tank and have a barren tank of 2000 liter, i would like to to operate the process at 900ppm of ...
Last commented on by Philibert
Thank you , very helpful
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130
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Started by kbob
I have a leach solution generated from a sulphide ore that is rich in iron with some copper (about 2%) and cobalt (bout 0.2%).  What is the best way to isolate and form a cobalt product from this solution.
Last commented on by kbob
I have now done this and now ahvea dark brown sludge at about ph5. had some issues with the pH adjustment as the reaction seems slow. I now have to get hold of some IX resin beads to test adsorption...
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Started by Aliarsen
I've been working on steel slag and sometimes the solution of leaching get gelated and crystalized?
Last replied to by kevinextraction
The analysis of this kind gel will help you to find the reason. Commonly, like Siddingquf said, the sillica gel may be one key factor. Looking forward to hearing more updates.
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Started by jtval
Hi About POX for treatment of refractory gold ore, considering that using only one autoclave can decrease the availability of the process plant, how many autoclaves should be used in POX process? Thanks for the help.
Last commented on by jtval
Thanks Todd.your experience was very useful.
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Started by mokhtaraazami
Hi as you know one of the method for treatment of refractory gold ore is POX. could you please explain about the limitation of S content in the concentrate? because I found in a Chinese text that the maximum content of S in the sulfide concentrate...
Last replied to by Todd H
The limitation on sulfur is due to several variables - 1) oxygen demand - how much oxygen can you deliver to the autoclave and 2) how much heat is generated.  In order to oxidize the sulfides you mus...
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Started by CigdemC
We are not sure the stability of the heap if we use agglomerated ore as overliner.
Last replied to by Yves
You said "use agglomerated ore as overliner"? Do you mean agglomerated heap leach over HDPE liners? This can be achieved by mixing 5 to 10Kg/t cement with moisture added to form small pellets; these ...
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Started by Devon2017
I have many kg of high grade pyrite/freegold concentrate, under microscope the sample looks amazing, I took 1 cup of nitric acid and a teaspoon of roasted concentrate and the pyrite has only half dissolved and no chemical reaction is happening anymor...
Last replied to by Yves
Yes nitric acid if concentrated at 25% will breakdown pyrite at room temperature with release of red nitrous oxide. You will have to keep adding the acid until there is no more reaction visible. Pleas...
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Started by Laurian Henry
Hi metallurgists, I want to model a cyanide gold leaching plant, please help me to understand the key components to consider when modelling leaching plant (it 's going to be my first model). Thank you all in advance
Last commented on by Laurian Henry
No Sir, I don't
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Started by tiuganda
Hi. Ive attached sample gold ore sample results. I would like to know whether its leachable with cyanide.
Last commented on by mtztaj
Mr Todd where is your location
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179
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Started by Metals Guy
Hie guys. I am having problems with the amount of copper associated with our ore. The copper content is not high enough for economic recovery but its high enough to cause problems in our CIP circuit and electrowinning. A typical elution would produc...
Last commented on by Metals Guy
Thanks Mohammed
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130
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Started by Hamid2017
Hi guys In a gold plant, the EW circuit efficiency is low, it is suspected that it is due to higher concentration of chlorine in the solution. any article or plant experience addressing this issue and suggesting any solution? your help will be highl...
Last replied to by Deano
Are you getting high values in the strip liquor so that the problem is only related to the actual EW section. It is often the case that these types of problems are caused by poor values in the strip l...
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187
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Started by tesaygo1
Our country has alot of source of gold-copper ore. But no one attempt to try new technique to process to recover gold on a high gold+copper ore. Most people in my country only know how to recover gold using MERCURY, AND FEW our CYANIDING. I only know...
Last commented on by tesaygo1
Sorry i didnt send my ore into lab. But base for my testing the gold content of it is 16.5g/t and i think its a oxide, since the pyrite content was a little. But for copper content, i dont know how ma...
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Started by NathanT
I am wondering if anyone has done any residence time testing on any leach circuits or tanks and has any advice they could supply.  We are planning to do a residence time test on our leaching circuit shortly and have ordered Azorubine (basically powd...
Last replied to by Robert
Putting into solution prior to introducing the tracer is a good practice. The time to dissolve may result in loss of resolution of the tracer peaks. The time for tracer dissolution can be more proble...
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Started by SUPERSX
I need to design a mixer settler for 10m3/Hr emulsion flow rate pl. any body suggest the design calculations. regards, Vijay
Last replied to by BAUD
Please, have you any idea about the settling process of your product ( settling rate, targeted concentration ) ? Which elements of the system do you want to design ?
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Started by theo
I am fresh graduate from the university currently undergoing training as a metallurgist and i would like to know the factors that can cause multiple tank overflow at the CIL circuit. thanks
Last commented on by theo
thanks man
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Started by CA
We've recently encountered some problems with electrowinning from carbon that has high Hg loadings.  We are doing an alcohol Zadra strip with carbon loaded from a non-cyanide leach.  When using alcohol, we usually see high Au recoveries within 24h...
Last replied to by jfernando
          It would be possible to remove Hg from solution depending on your operating conditions.  
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108
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Started by Okay
Hello everyone, For the heap leaching of oxide abrasive ore without clay particles, I could not reach any information about crushed ore size estimation. So,what should be the crushed ore size to feed to the heap leaching ? Could you please also give...
Last replied to by Rheomet
Ditto Mutassim. Also, need to look at the porosity of the ore before and after the leaching. Specialized testwork needed for compete evaluation and overal (metallurgical / stability / enviornmental) r...
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Started by John R
I am compiling some data on Merrill Crowe circuits and are interested in how much zinc dissolves.   I would expect zinc to go into solution as gold and silver are precipitated stoichiometrically, but generally a large excess of zinc is added.  Ge...
Last replied to by Richard S
It has been my experience that there will be excess zinc in your precipitate.  While some zinc will dissolve and form a zinc cyanide complex and deplete free cyanide content in the barren leach solut...
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147
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Started by Samuel Trindade
Hello gents, If the increase in cyanide concentration causes the Au(CN)2 breaking equation to be shifted to the more cathodic side (increasing the cell voltage), why do I need an initial concentration of 1% NaCN in electrolyzing solution? I know th...
Last replied to by Sachin Prakash
ALCOHOL STRIPPING Further research at the USBM showed that the atmospheric pressure Zadra stripping cycle can be made to operate much faster by the addition of alcohol to the strip solution (6). Fi...
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Started by babygenius76
Has anyone looked into this issue? I have heard about adding sodium hydrosulphite is added to an acidic slurry of talc and diluted sulfuric acid. I am concerned about the safety of anything related to sodium hydosulphite. Any suggestions? 
Last replied to by Robert
Look at the following. As part of this searching the patent data bases for US and EU will provide details of process and processing conditions. Note that understanding whether the discoloration arise...
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208
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Started by Nikolay
Hello members, here is the tricky question. So I'm getting by gravity (shaking table etc) monazite concentrate with 20-30% TREO and 5-10 g/t Au. Particles size is about -0,5+0,05 mm. It is very convenient to get only one collective concentrate becaus...
Last replied to by Nikolay
Hi, thanks for response! My concentrate is from waste of alluvial gold placer. The goal is to produce individual REO and Dore bar. We crack monazite by sulphatisation with water leaching, gold remains...
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258
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Started by Austin Muvimi
Anyone with the knowledge of cold caustic cyanide carbon soak prior to elution for removing copper?What are the quantities for caustic soda, cyanide and water and how long should be the soak?I have 600kg carbon and copper load is 1.8%.I use zadra elu...
Last commented on by Richard S
You still need to be at a pH of 10.-11.0 for safe use of cyanide. The temperature should be less than 150F to avoid ellution of gold. You can adjust pH as needed to keep it in range with caustic sod...
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136
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Started by Adrian Hall
Hi everyone, I have 200 tonnes of ore that is preg robbing.  The free gold is approx 30% and the preg robbed gold approx 60%.  The remaining 10% is slow leaching preg robbed and locked in either sulphides or silicates. I had diagnostic leaching t...
Last commented on by Adrian Hall
Hi Richard, This material came from cleanup from a mill. The grade is coming from loaded carbon. The oxide ore was probably a few g/t. However this goes 60 g/t. Several prospectors have tried to...
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Started by Charlie
What would be a good DO dissolved oxygen ppm level in the leach tanks? I am leaching a silver rich ore with 100 to 600 g/t in feed.
Last replied to by Charlie
Thank you everyone. This is great!
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120
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Started by Franky
Hi, i'm a student and in framework of my studies i have to plan a Proccesing Plant. My part is the CIL Plant, and as i'm not into the Hydrometallurgy i have some questions... I hope somebody here can help me. We have an sulfide pyrite mineral. So t...
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Started by Stibnut
Hi all, I am a student in atmospheric chemistry who has developed a side interest in chemistry overall. Then I ended up doing metallurgy and found it quite interesting. It's time for something ambitious. And dangerous, I know, but I hope to persuade...
Last commented on by Stibnut
Thanks! Looks like a promising setup.
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Started by
Which solution is used to sprinkle a fresh heap leach? Is it barren or intermediate. Please support your answer with reasons Thank you    
Last replied to by BAUD
Which minerals and grades have you in your ore and what is your target by heap leaching?
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149
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Started by bryan randolph
Hello all      I am an amature gold and rock hound, my buddy and I went in together and bought a gold dore bar and we are having problems trying to dissolve it out. I have been told to use nitric acid and I did some but I am scared because I dont...
Last replied to by GeoffC
Seems too good to be true! A dore bar for $200. If there is gold in it the easiest way to realize the value would be to send it to a commercial refiner or mint. I don't know how that works in the USA....
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Started by GuoHaiGHsolutions88
I am looking for some testing data on effect of blinding agents on gold leaching kinetics from gold ores containing carbonaceous materials. Any data or comments are highly appreciated. Many thanks.
Last replied to by GuoHaiGHsolutions88
They are my blinding agents, I would like to know if adding of these blinding agents will slow down the leaching kinetics of gold and to what extent
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Started by martie
Hello there. I know lead nitrate offers some benefits in gold leaching. However, is there a downside to dosing it in a CIP plant? Any impact on adsorption?
Last replied to by David
For your review: https://rsteyn.files.wordpress.com/2010/07/leaching-adsorption-basics-and-example.pdf https://www.911metallurgist.com/hydrometallurgy/effect-of-lead-nitrate-on-gold-leach-kinetics/ ...
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Started by Ahmed Zaky
hello ,  which is the best in gold stripping from active carbon heating active carbon directly with cyanide solution or passing solution through carbon with certain bed volume  or two ways give the same result        thank you
Last replied to by David
Ahmed, maybe you are not getting an answer because we can not understand your question.  Can you please clarify your situation.
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131
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Started by sherafat71
What are the methods for removing chlorine from zinc sulfate solution?Techniques such as high heat and water washing can help remove chlorine, but what other methods are available to remove chlorine from a zinc sulfate solution?Thank you
Last replied to by sherafat71
Thanks for your answer to produce  solution for electrolysis, we have a problem that is high-chlorine calcine .this problem is not solved by hot-water washing methods or addition of salts and even t...
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157
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Started by Siddiquf
Are there any companies who specialize in supplying equipment and flow sheet for sulfuric acid leach of oxide ore and copper cementation, both in batch and continuous operating modes? What kind of iron/steel scrap is best for copper cementation? What...
Last replied to by Siddiquf
We are thinking of starting at a pilot scale of 1 to 10 tonne of copper ore at an average grade of about 2-3% oxide copper. Scaling up to 100 tonne ore per day over a year is the current target.
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Started by Fachrifaa
Hello everyone, I was doing some lab testwork to reduce copper concentration at pregnant leach solution after cyanidation leaching using SART ( Sulphidization-Acidification-Recycling-Thickening) method, and found out that the gold also precipitated u...
Last commented on by Fachrifaa
I've done some calculation for this, and the recoveries of Cu, Zn, and other basemetals are make sense for the addition of Na2S 150% based on copper stoichiometry at the solution. maybe the recoveries...

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