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 Seeker
What would be the best way to recover gold from gold bearing gold stripper solution?
Last replied to by Reactor
Do you have a detailed assay on your "typical" stripper solution? Also, what GPM volume of solution are you dealing with?
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Started by shastry
Hello, Our leaching plant is  manually operated and we want to go for complete Automation ours is 2000 tonnes per day capacity plant. Hence please give me the inputs where to start from and what all the equipments  required. 
Last replied to by DwoodFLS
If you still need help with this please let us know.  https://www.flsmidth.com/en-gb/products/process-control-and-optimisation We have designed recovery plants all over the world. 
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Started by martie
Hello has anyone done any work on the stripping of gold from carbon fines with virgin carbon (or regenerated carbon) in a cyanide solution? Or any literature?
Last replied to by DwoodFLS
If you fill your elution vessel with course carbon to create a "filter bed" you should be able to put your carbon fines on top of that bed and then strip it normally.  This would all be dependent on ...
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Started by Millza79
Hi all,   has anyone got typical costs for North American Cu heap leach operations (in US$/t) with a breakdown of: SX EW Crushing Leaching Materials handling Labour Power     Also Capex and working capital costs would be good.   Hap...
Last replied to by Jorge
Follow the link below to get some information, https://www.tasekomines.com/assets/docs/2017-01-16%20NI%2043-101%20Florence%20Technical%20Report.pdf
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Started by Jose Doneiber
Greetings to all. For a little over a year, I am working with cyanidation by agitation method. At the moment I am working on 2 tanks with the following measures: 1. 90m diameter and 2m high. I filter rich solution with sand filter, I precipitate ric...
Last replied to by Jorge
Hi Jose, Follow the link below to get more information on cyanidation, https://www.911metallurgist.com/blog/gold-cil-process-explained
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Started by RIO23
when on a paper I see concentration of H2SO4 in g/L of H2SO4 is the same as concentration of H+ in g/L?
Last replied to by Jorge
If there is not any special indication,  g/L of H2SO4 is related to the acid concentration. 
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Started by Millza79
Does anyone have an opinion on what is better for sampling slurries - poppet or cross-cut samplers?   Particularly, on gold cyanide leach feed samples.
Last replied to by SmartDog
An old adage for sampling was that in decreasing accuracy you have: All the stream all of the time All of the stream part of the time Part of the stream all of the time Part of the stream part o...
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Started by oro
I want to test a leach tank for concentrates using just a blower for agitation.  Keeping it simple I’ll use two 55 gal drums welded together (vertically), the tank will have a cone shaped bottom and be supported on legs.   A 3/4” pvc tube is p...
Last replied to by oro
I'll check it out.  Thank you Todd!
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Started by redcastle
I have a small ball mill ( 1 to 2 tph ) and plenty of oxide ore and I was looking at the feasibility of building a test small scale leaching circuit that could be run in a batch style to keep it as simple as possible. My current idea is once the ore...
Last replied to by redcastle
Hi Todd thanks for the reply, I didn't think of filtering the slurry and that seems like a good idea, washing the tailings will probably help with enviromental approval as well. I don't know much abo...
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Started by alimrtdha
how to know the ideal number of stage required to remove gold in CIP process
Last replied to by Todd H
The number of stages is a tradeoff between capital cost and gold losses.  Typically more tanks are better than less to reduce short-circuiting and potential gold losses. More tanks = more cost in eq...
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Started by Henley Munn
Hello In a gold heap leach is there a relationship between the ILS Au ppm, the dissolution rate of gold from ore, the ore grade and amount of free cyanide. If there is still free cyanide in solution will gold in ore still be soluble or is the disso...
Last commented on by Henley Munn
Consumption is around 0.39kg/t Ore is agglomerated with the agglo water at a ppm of 1000. off flow from the heap typically has a cyanide ppm of 10, although the first two cells can range up to 40ppm...
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Started by Alex Loutou
Hi all, Could someone help me why gold dissolution lower than silver as we know silver is slower than gold and during my work in this site gold always above silver recovery. Note: leach agitate method oxyde ore gold:silver ratio 1:10 Cyanide ...
Last commented on by Alex Loutou
Thank you Tesaygo, yeap, I still investigate on it include diagnostic leach test, XRD and mineralogi test. I just confuse because there are no different type of ore (source pit)
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Started by AJ
Last replied to by AJ
Thanks Mike Its good to get an empirical answer Regards Andrew J
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Started by Adimulu
We are running CIL circuit , 2 leaching thanks and 7 leaching&adsorption tanks.gold deposit is a greenschist facies lode gold deposit in which mostof the gold is hosted as free gold by quartz-sulphide vein in alteredmicrogranite, with minor gold asso...
Last replied to by TonyE
Your concentration of cyanide in your last tank is low. It should be at least 150 ppm. The Low pH in the last tanks is the reason. HCN is being produced in the process due to lime (or other pH modifie...
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Started by Robbo
Is there a formula for the percentage of carbon added to the process?
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Started by ZAKOR METALS
Hey everyone any one who can help me with cost of a leaching system of making 300  tons per month of copper cathodes.  
Last replied to by SmartDog
somewhere between 600,000 and 60,000,000+ depending on the ore grade, mineralogy, location, and many other factors.  Besides that is a very small operation about 1 to 2 t/hr.  More like a pilot [...
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Started by Joeram
I tried every acid combination. I tried roast and smelt with different fluxes. I have 2 assay's and a Lab report on my ore.I sent cons not rock, so they could only give me the amount per what I sent not on per ton. Au,lr,pd,pt&rh. It takes 1 -5 gallo...
Last replied to by Jose Doneiber
Hello, Joeram.Nice to meet you.Can you please give me a copy of your manual cyanide pdf ?.I am very attentive.Thank you
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Started by PRefiner
Hello,     My name is Cameron and I'm a Merrill Crow refiner. The mine I currently work at is brand new and I'm having troubles finding the correct flux recipe for this precip. I do not have a analysis to reference off of and it pretty much Is tr...
Last replied to by Jose Doneiber
Hello my dear friend. Nice to meet you, my name is José Montoya from Colombia. I would like very much to be able to guide you a little about your process, for this I ask you please give me a more i...
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Started by Paulo Mrewa
I need help with design and schematics of 40tonne vat leach tanks, the old ones have had an unusually low flowrate, i need to build new ones
Last commented on by SmartDog
I generally as long as your floor is sloped at least by at least 1% you should have flow, unless everything is plugged up as Paulo said.
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Started by Millza79
Hi All,   Just hoping I can ask some technical questions. In any gold or silver plants you have run: ·         Did you add lead nitrate, and if so, where was it added (in ball mill, separate tank etc), how much (g/t), and what was the co...
Last replied to by Bhaduri
Pb(NO3)2 is added to the Ball mill for soluble sulfide removal as Shastry commented...attempt no more than 2-lb/st for starters...Pb(NO3)2 + S2- = PbS + 2NO3- increasing reagent amounts based on effic...
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Started by LLandwehr
I am looking for methods to predict the recovery of a single ore source from historical data, namely a blend of multiple ores in different ratios and overall recovery for each day. It's a CIL plant and the ore types are all similiar in composition an...
Last replied to by Dave Tahija
As noted by Colette, the synergies between different ores in a blend are really important and make it impossible to precisely determine a specific recovery from a particular ore. If you have good data...
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400
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Started by Seeker
I want to recover gold from gold cyanide solution. This solution contains hydrogen peroxide also. I have tried metal displacement method. It does not  give complete gold recovery. Please suggest me some chemical method through which I can recover al...
Last replied to by Joeram
Ron G,   I read the link you provided[cya-che-gold- extr] I dont understand most of it. I have no knowledge of chem. or smelt or acids. I am new to this. I do have 3 mines willed to me. I do...
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Started by Jaime Jacob
Hello I am working with column leaching test for copper ores and I need to model the net and raw acid consumption.Anyone could help me with this? Send me some scientific study? I hope that can help meThank you very much Jaime
Last replied to by Jaime Jacob
Hello David What I need to do is modelling the gross comsumption of acid from a column leaching test. For example, if we want to model a copper recovery, we use the expression:  R = Rmax *(1-exp(-...
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Started by Millza79
Could anyone please tell me what the K and n values (Fleming numbers) mean for this test?   What do high and low values off both values mean about the ore, and the design (in layman terms)?
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Started by ksherren
I am looking for companies who have expertise with designing/fabricating/operating vertical carbon adsorption columns in heap leach CIC circuits.
Last replied to by rob riggir
I have some drawings of columns including NIMCIX. Cheers  
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Started by BUBKWEY
Hi fellow metallurgists,    Before trying this new prosuct "Eco-Goldex O series " to replace Sodium Cyanide in my VAT leaching operations, I would like to get some firsthand proof from anyone in here about the following:   -Is "Eco-Goldex O se...
Last replied to by Deano
Always keep in mind that uv light is adsorbed by water so you are looking at a longer exposure in a stirred tank to ensure that all parts of the liquid spend some time at the exposure surface. You ar...
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Started by Seeker
We  have a gold cyanide solution of 30 liters. We removed gold from gold fingers. We used 500 grams of commercial grade sodium cyanide and 1.5 liters of hydrogen peroxide of 36%. This solution contains 100 grams of gold around 5 grams of iron and 5 ...
Last commented on by Seeker
Thanks for your suggestion. I will follow it next time. Now I need to recover the gold from the cyanide solution. I have written about the metals present in the gold cyanide solution in my question. I...
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Started by Njau
Hello, i need to know the effect of sodium ions as salt composition during leaching. if there is effect at which concentration. pls i need help
Last replied to by Ron G
I am guessing that sodium is purely a spectator but it would help for you to give approximations of the concentrations of known ions present. 
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Started by BUBKWEY
I have stockpiled several thousand tons of TAILINGS in my former Mining Site, which have Very much content of Copper (>10,000 ppm). Silver and Sulphur are there as well though not at an alarming quantity as that of Copper (Silver ~4000ppm, Sulphur...
Last commented on by tesaygo1
Oxide or sulfide can also be float. Froth floatation is also a option for this kind of ore. But it is necessary to do a pilot test for every kind of tailing you've process. You can also try to leach t...
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Started by Mpiga
I am operating a vat leaching, the problem is, when i load my tank and leach for 24 hrs, the first day color test will how black but second day shows grey, after unloading the tank and reload the same material, leaching again for 24 hrs, tests will h...
Last commented on by Mpiga
Thank you
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Started by Seeker
Will aqua regia change gold cyanide into gold chloride if it is mixed with gold cyanide(AuCN) solution, If not what will be the result?
Last commented on by simon@p
you should look also about the cost of having 100% recovery use carbon but its efficiency is not 100%
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Started by simon@p
i am facing a problem of high loss of carbon as fine carbon after every strip about 2tones per month. i need help on pump to use or easy system which can reduce production of fine carbons
Last commented on by simon@p
thanks
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Started by kahonde
Hello,can I use hydrogen peroxide to add oxygen during vat leaching of gold? if so, how much per liter.
Last commented on by AJ
Hi KahondeI cant find your email address on your profileIll be glad to help if I canMine is hereRegardsAndrew
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Started by simon@p
i need help on method to reduce amount of gold lost in tails. i am having a problem of low cyanide consumption(250ppm dosed while 190ppm in tails) but still losing gold in tails    
Last commented on by simon@p
Ok, thanks i will check on that
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Started by Alex Loutou
Dear Collega, How to manage Mercury in pregnant solution (0.02 ppm) which is became 400-500ppm in the filtered cake.It is problem with environtent. any suggestion will highly apreciated regards, Alex L
Last replied to by oro
We have a similar issue with high levels of Hg - but in the head feed (tailings) and need an effective method to remove the Hg as part of a cyanide process.  Head feed process is 10-15 tons x day.  

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