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 Jean Rasczak
What are main problems in copper SX that cause to crud forming? Apart from the solid content in the PLS solution. I know a little bit of crud in not dangerous 4- 5 centimetres in the settler. I hear italso helps coalescence phenomena, but over 10 cm ...
Last commented on by Masterkap
Agreeing with Maya, I add that by our experience as industry in Brazil (Masterkap.com.br) we have seen many of our customers in the Americas testifying the benefits of the vinyl/PVC mats to the prospe...
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1078
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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 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...
6
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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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569
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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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690
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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.
2
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1476
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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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571
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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...
6
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787
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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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633
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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
1
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589
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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...
4
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644
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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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649
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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...
5
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575
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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...
4
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700
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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...
5
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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.
4
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526
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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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Started by Victor Bergman
I'd like to know if there is a methodology to measure organic entrainment in aqueous phase. I've found a methodology with UV-visible, but I was wondering if there is another way.
Last replied to by Victor Bergman
Thank you so much for your responses. The UV method is made with a calibration curve, with different concentrations of loaded organic dissolved in ciclohexane (as found in a Phd. thesis of the USACH, ...
4
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Started by Helena Russell
Does anyone have any experience of the addition of a fuel industry tracer to a diluent - particularly on the physical performance of copper SX systems? The tracer, going under the trade name of Authentix A1, is added only to change the colour of the ...
Last replied to by Marshal Meru
The effect of Authentix A1 was the basis of a great deal of SX compatibility testing in the Shell lab back in 2008 when the South African government insisted on its addition to all hydrocarbons locall...
3
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727
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Started by
I was doing some phase separation tests in the lab today and we saw that separation is faster when adding organic to the aqueous at a slower rate (while stirring the aqueous). Any way i can relate this back to the plant? Our A: O ration is 1.2:1, but...
Last replied to by
The choice of continuity is complicate question, where many factors have to be considered - mass transfer, separation rate, which phase should be cleaner after separation etc. Regarding organic in aq...
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Started by
I am looking for recommendations and/or shared experiences on successfully proven in operating SX plants technologies, and currently active technology vendors, for removing entrained aqueous droplets from a circuit organic stream - e.g. materials and...
Last replied to by
To remove aqueous micro emulsion from organic phase one should choose granulated hydrophilic media. Granulated form allows cleaning the media from entrapped suspended solids by backwash operation with...
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Started by Marshal Meru
I need information about the SX extraction of arsenic. Actual Operations: Location, reagents, configuration, production, performance, old operations, why stop working.
Last replied to by Maya Rothman
http://www.mining-solutions.basf.com/ev/internet/mining-solutions/en/function/conversions:/publish/content/mining-solutions/download-center/redbook/Preview_BASF-Redbook.pdf
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Started by
I just want to know how to increase leaching efficiency of copper concentrate. Or to have after leaching high grade copper PLS?
Last replied to by
Look particularly oxide and sulphide or soluble and insoluble copper and cobalt proportion in the feed. What is the residual sulphide content of the roaster calcine? Has your plant still have residual...
4
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596
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Started by
Using clarifier to remove solid particles from PLS before feeding to SX process needs flocculent or not? Isn't flocculent harmful for extracting in extraction stage?
Last replied to by Helena Russell
Non-ionic floc's are fairly commonly used during crud events such as a significant rain event; however, use of a clarifier is quite uncommon (you can't afford it at the low percent solids in the feed)...
14
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Started by
May be increasing gold recovery from refractory gold ore (with grade 2-3 g/t) to 90-95%?Actual data of top refractory gold ore mines show, that gold recovery is 70% and less. What is reason? It is a problem in minerals processing or it is a global sc...
Last replied to by Zander Barcalow
I had worked on bioleaching of arsenopyrite ores, concentrates and tailing in which case it was observed that bacterial leaching helped in a big way in improving the extractability of gold. In ores an...
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Started by
For a copper ore which contains Chalcocite, its copper grade is around 0.5 %, pyrite content is very low and acid consumption is around 150 kg/t, how copper bioleaching process?
Last replied to by
At 150 kg/t acid consumption, if that is a properly conducted test, you will not be able to economically process this ore using the acid leaching route, biological or not, if you have to purchase the ...
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2004
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Started by
What will be the best method of recovering fine carbon in CIL gold processing?At the moment fine carbon is sent to the tails hopper to be sent to the TSF. Knowing that these carbon has an amount of gold, I would like to develop an alternative way of ...
Last replied to by
I would like to ask if any chemical has more affinity to adsorb on activated carbon then it can replace NaAu(CN)2 at the binding point and thus forcing NaAu(CN)2 back to the solution which can be once...
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Started by Jean Rasczak
I use 5 leaching tanks, 4 adsorption tanks and Pressure Zadra system. Gold accounting is my challenge. I need to balance and account for gold in my circuit.
Last replied to by Marshal Meru
The answer to your question would fill a (large) book. There are so many ingenious ways people take gold all the way along the mining chain from the mine (underground and open pit) through to the proc...

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