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
I need to know more about silica’s impact on copper SX and best practices for dissolved silica for its removal.
Last commented on by musongpll
Mi M. Bill Can you explain please, how you are clearly separate 50% of silica from the PLS
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Started by Gruppen
I'm working with carbonaceous gold ore at laboratory scale, now I’m doing at pilot test in two stage: gravimetric (shake tables) where I get concentrate (almost clean without carbonaceous material ready to cyanidation), the tail of shake table has ...
Last commented on by Handerson
I would love to get the articles you have with Raman spectroscopy. Thanks! handerson.asilva@hotmail.com
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Started by
Anyone could help me by giving advices to determine free cyanide CN- in CIL solution if the solution contains sulphide?We are titrating the solution by Silva nitric using CN indicator, but experiencing some difficulties because of the presence of hea...
Last replied to by AJNeale
The web-site says it is "semi quantitative" so I'm not sure of it's value in the gold processing sector.
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Started by Amar
Does anyone know the actual free cyanide concentration in GOLDIX 567 OR 570 and where do I find GOLDIX for sale?
Last replied to by David
Hi Mikhail, Best contact Florrea (Goldix): Yang ZhiyongPresidentMobile: + 86.136.0982.1616Tel: +86.24.3151.5191Fax: +86.24.3151.3277Email: yang.zhiyong@florrea.comSkype: yang.zhiyongMSN: yang_zhiyon...
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Started by
We use the Zadra strip/EW process to produce gold sludge, which is then sent to our furnace, after drying, to be refined. I was curious to know how one would determine the best flux recipe (constituents/amounts) for primary refining. Additionally, wh...
Last replied to by Marshal Meru
When gold slimes contain much lead ( up to 23%). They were treated in various ways, but the best results were obtained by dissolving in sulphuric acid and melting the residues in clay-lined pots (to p...
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1915
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Started by Sudhirkumar
Normally what is the optimum carbon concentration at the gold CIL process? I need some advice to maintain 7 CIL tanks.Currently we have 3 leach tanks in the front and then followed by 7 stages of CIL.
Last replied to by Philip Stewart
The amount of carbon in a tank and hence its concentration are important to ensure that the amount carbon and its residence time are sufficient to ensure that the solution concentration and the loadin...
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Started by Kumar Choudhry
Would you please help give information how is the correlation of density (%solid) to gold and silver recovery in gold Cyanidation (CIP) leach process. Is there any typical optimum value? And what is the explanation?
Last commented on by nurdyme
aiming at 50-55% solids, would the dissolution be high. on the part 55% percent part, i thought carbon would float and the residence time increases
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Started by Kumar Choudhry
I need to know the best and most efficient way to add hydrogen peroxide into the CIL gold leaching circuit
Last replied to by Marshal Meru
The effect of hydrogen peroxide on gold leaching rates in alkaline cyanide solution is a matter of controversy and debate. Early studies indicated that the reduction of hydrogen peroxide on gold sur...
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Started by
I am currently in a pilot phase here in Costa Rica to determine the viability of using mechanical means (centrifugal concentration) for primary recovery from whole ores and lixiviation as the secondary / final recovery, but a cyanide alternative. I h...
Last replied to by David
http://is.gd/4VGbdK and this PDF. https://www.911metallurgist.com/blog/millers-gold-refining-process-equipment-supplies https://www.911metallurgist.com/blog/gold-ore-chlorination-laboratory-tes...
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Started by Zander Barcalow
Does anyone have an idea on whether or not it is useful and helpful to does NaCN via stage addition in cyanide leaching?
Last replied to by
Another good reason for staged addition of cyanide is that maintaining low concentrations of cyanide reduces dissolving copper minerals hence saving cyanide and yielding dore with less copper for less...
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Started by Sandeep Bisht
Is it possible to avoid the adsorption of copper from cyanide solutions on the activated carbon in CIC operations?
Last replied to by
I think you are on to something here. It will however; be important not to look at the total copper in isolation. In other words it will be important to look at the actual cyanide soluble copper conte...
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2045
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Started by Raje Singh
What possible laboratory tests can be done to determine extent of calcium fouling on activated carbon?
Last replied to by
Is the fouling of the carbon by calcium a hypothesis as a plausible explanation for the current circuit performance or a demonstrated fact?A very simple comparison testing of the absorption (or remova...
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825
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Started by Helena Russell
My problem is with regards to precipitation of Au and Ag at minimum concentration of CN. I need to lower the cyanide concentration to a limit in the Merrill Crowe processto 20 ppm of free cyanide and 50 of WAD, but I have problems with the precipita...
Last replied to by Gruppen
Try cutting back on Zn addition, Au and Ag come down by reduction to metal on the Zn surface and the rest as a result of hydroxide precipitation, try reducing Zn and keep copper in solution, also can ...
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Started by Tarun Karakoti
Wondering if it is possible to test for CN- only as opposed to free cyanide (HCN and CN-) in conventional CIL leaching, as a way to justify maintaining high pH in the circuit?My understanding is that at a pH of 9.3, 50% of the free cyanide is HCN, wh...
Last replied to by Tarun Karakoti
Thanks for all your input, really appreciate you taking your time to help out. Will need to digest all that has been said and look into it a little further, and if I come up with a reproducible conclu...
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Started by Zander Barcalow
How to recover silver from silver sulphide concentrates. Our method cannot melt the silver to reduction. What could be the reason?
Last replied to by Victor Bergman
Are you fully aware of the mineralogical host(s) for Silver? Knowledge of this should guide you in ascertaining both thermodynamic and rational evaluation of how Ag should behave. For example, if you ...
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Started by
I have some questions about diagnostic leaching.Should we compare the diagnostic leaching results with Gold deportment information from mineralogical analysis? These two results should be interpreted separately or they should agree with each other so...
Last replied to by Unterstarm
Just sharing of previous experience, often a GRG centrifugal concentration such as Knelson or Falcon should need to be run as the first part of Diagnostic leach to catch the free Gold content. Followi...
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662
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Started by Obergruppenfuhrer
What are the reasons why high cyanide concentration does have a decelerating effect in gold dissolution? Our process is batch type, maintaining pH of 10.5-11, leached for 24 hours. The ore contains: Gold, silver, high in quartz, high with pyrite, and...
Last replied to by Sturmbann
I think it's because of other secondary reactions that consume CN.
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Started by Amar
Apart from generating HCN, what are the other effects if pH in cyanidation process is low?
Last replied to by Obergruppenfuhrer
CN- is required to leach gold and thus at decreasing pH's the quantity of CN- decreases due to the formation of HCN as pointed out above. Thus, the gold leach reaction can become cyanide limited if th...
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Started by Standartenfurer
How to effectively identify overdosing of lead nitrate [Pb(NO3)2] in gold cyanidation.I'm interested in optimizing the lead nitrate addition at a standard 4000 tpd gold mill using conventional cyanidation. We currently add -240g/t lead nitrat...
Last replied to by Marshal Meru
I recommend some bench scale tests to come up with the optimized conditions.
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616
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Started by Sandeep Bisht
Could somebody indicate me any Ag extracting method from Silver oxide batteries cells?
Last replied to by
The silver oxide should be soluble in either nitric acid or aqueous ammonia and the silver can be recovered by electro-winning. Do the batteries have gold plating on one or more or of the contacts? If...
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751
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Started by Amar
In gold ore cyanidation I want to know which form of mercury (native, cinnabar, metacinabbar) can be leached?
Last replied to by
The metallic mercury is leached by cyanidation, while as cinnabar can be leached with HCl - IK.
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Started by
How effective is oxygen Filblastas an improved technology for oxygen injection. Oxygen uptake rates were measured for each injection method. It was found that the oxygen dissolution efficiencies were approximately 26% and 4.4% for the Filblast unit a...
Last replied to by Obersturmbann
I used Filblast in a gold processing plant in Australia with some success using oxygen. The pump system used was simply a recycle pump in the first leach tank which recycled slurry from within the fir...
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613
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Started by Jean Rasczak
Norit procedure for Carbon Loading study mentioned KAuCN to be used as the Gold in adsorption solution, adding to a pre-prepared buffer solution.Anyone know the reason of using KAuCN specifically? 
Last replied to by
The processes are very different (regeneration versus re-activation or virgin material activation). Regeneration is essentially a pyrolysis of the non-volatile organics and a thermal desorption of the...
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871
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Started by Hauptsturm
Do you know if there is any cyanidation plant this using lead nitrate in the process? I am concerned that this increases the lead grade in my Dore. Someone knows how others have eliminated this problem?
Last replied to by Tarun Karakoti
If sulfide is a problem, pre-floating before cyanidation is the better option.
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698
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Started by Tarun Karakoti
Can Sodium Ferrocyanide replace Sodium Cyanide in mining?
Last replied to by Zander Barcalow
Ferrocyanide appears to be an attractive depressant for pre-activated pyrite. Some work of ours has shown that ferrocyanide can play a similar role to DETA, by attacking collector-Cu at the surface of...
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Started by Helena Russell
Over time I have seen two generations in the gold industry for non-refractory ore. The first began in the 70s of this past century. Its name - gravity technology and applied to ore with minimum grade 2-3 g/t. The second began at 0s 21century. It name...
Last replied to by Helena Russell
I’ve read about ERGO plant. ERGO technology is known as flotation with ultrafine grinding concentrate. But comparison will be incorrect, because both plants have different initial product (ore and t...
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Started by
I am developing some simple but elegant tools that will make data analysis of ABA Acid Base Accounting data quick and simple. Currently, I use Excel to load the data then use Excel VBA and formulas to output the data to several charts outside of Ex...
Last replied to by
It's posted on my website. Please look at the post I put up earlier today or follow the link to the packer testing paper here:packertest.com
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643
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Started by Oberstorm
My gold ore is contaminated with naturally occurring coal (namely graphite and anthracite).can naturally occurring coal (not activated carbon) have a negative impact on gold recovery if milled to -150 microns with an ore? Does naturally occurring coa...
Last replied to by Marshal Meru
Naturally occurring carbon (coal, graphite or just carbonaceous shale) is great (sic) for absorbing gold from leach solutions. This is with or without grinding, to 150 microns. Grinding gives more sur...
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Started by
Will decreasing PLS temperature to less than 10 centigrade affect on copper ion exchange between organic and aqueous phase and their phase separation? If yes, what is the solution?
Last replied to by
To warm PLS should be the best option but it can increase the costs. A cheaper but slower solution could be to avoid heat losses in PLS piping and trench flowing. In some high altitude projects I work...
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681
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Started by
Am looking for a procedure; may I ask if there is a publication of test methods and standards in the solvent extraction industrial?If not, may I ask how I can be sure of the reliability of my tests?
Last replied to by Jean Rasczak
The test methods and standards for SX reagents are different, Chelation extractants, Ion-Pair extractants, Organic Acid Extractants and so on. You need to figure out which kind of SX reagent can work ...
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692
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Started by
I am working with a DEHPA/Isodecanol/Kerosene system and I contact the organic phase multiple times with fresh aqueous solution. To build up the concentration of the element I am interested in. However, at the same time ferric is extracted as well as...
Last replied to by
With respect to my previous tests, if you had more ion concentrations than that of concentration corresponding to D2EHPA capacity, the D2EHPA structure would start to decompose like a waxy layer you m...
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Started by Bob Mathias
In our SX we are maintaining organic flow of 650 m3/hr with strength of 12% which is giving max. test of 6.5 gpl. Till 6 gpl copper I am getting extraction efficiency of 85 - 90%. But as soon as tenor goes further high even 6.2, extraction efficiency...
Last replied to by Bob Mathias
Thanks for information. I have contacted Cytec. They told it will take some time to send the equilibrium curves. We have split circuit with low PLS and High PLS. Organic flow as series parallel. First...
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755
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Started by
What is the rule of thumb for a how to on vertical position of a pumper mixer impeller within an SX mixer box? I am in the midst of finalizing the design of a very small 3L/h SX rig for some small scale trials but have been unable to find any reliabl...
Last replied to by
There is a great topic and answers! I think it's important to characterize the couple "agitator-mixer". Number of power and pumping, for example. The turbine must not have to be too big for having hig...
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Started by
Does anyone know if anyone has a commercially available small SX column? Or not, does anyone have an available design which can be made in a local workshop? A lab scale column would also be extremely useful if available. The A & O flow rates can be t...
Last replied to by
Mintek in South Africa has two small columns for pilot plant test work.
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Started by Maya Rothman
I need to analyze the real composition of an organic phase sample, which techniques would be necessary? (GC-MS, RMN?)
Last replied to by
It depends on your practice. If you want to analyze the chemical elements, you will use the MS or NMR. But if you only want to analyze the material composition, you just need to use HPLC, or GC, no ne...

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