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 Millza79
Hi All,   for determining heap leach recoveries, is this the formula: [(Total PLS flow (m3) * PLS Au (ppm) * Solution SG) - (Total barren liquor flow (m3) * barren liquor Au (ppm) * Solution SG)] / (Total tonnes on heap leach * Head Au gr...
Last replied to by David
Hi, i had to ask a friend and he says generally, yes. To calculate recovery of a heap you subtract the metal applied in the leach solution from the PLS and can calculate this as a percentage of the m...
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Started by mashafaei
We have a copper mine, which combines copper sulfur and copper oxide, that copper oxide extracted   using "HEAP LEACH" process . It is now the copper sulfur was remained in the "HEAP LEACH" with a concentration about 1-5%. My questions are:   Is...
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Started by Millza79
Does anyone have any papers or links on the metallurgical accounting for heap leach operations? I.e., where are sampling points (each solution flow, each lift etc), how are recoveries determined etc?
Last replied to by David
Normally heap leach operations develop their own mass/met balance in house (Excel) with the metallurgist or purchase proprietary software such as Metsim, Goldsim, etc.. The key is keeping good record ...
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Started by Edson aman
In most cases leaching process is done using sodium cyanide due to its high activity while in adsorption the activated carbons work well when there are many  calcium ions in the pulp therefore in other words it seems like not necessary using sodium ...
Last replied to by SmartDog
Cyanide is the general descriptive term applied usually to sodium cyanide (NaCN). However, the early work in cyanidation was based on the use of potassium cyanide and strengths of solution as well as ...
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Started by simon@p
hellow, I have gold ore which contains high amount of copper.  I have heard that apart from flotation I could use ammonia pre-treatment to reduce the amount of copper in the ore I have bottle rolling test so I'm asking for the procedures to do th...
Last replied to by tesaygo1
Hello guys, Last year i also tried this process buy haven't get a good result due to insuffiecent equipment, but somehow give me a idea how things suppose to be working.   Since you guys are worki...
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Started by simon@p
can ammonia be used as an alternative to remove copper from gold loaded carbon instead of cold cyanide wash
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Started by Reactor
This is the only reference I can find on the benefits of crystallization in mining processes. Are there other mined ores that have crystallization as a part of their process (either to improve recovery or to separate elements)?
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Started by jonas chihoyi
gentlemen assist me with initial cn and lime additions in a heap leach operation
Last replied to by Jorge
The first step is to perform cyanidation tests to evaluate the effect of different parameters on gold extraction. For example, NaCN strength, you can study three levels, 0.5, 1.0 and 2.0 g/l. The pH a...
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Started by Jaime Jacob
Hello I need to modell a copper column leaching, the movement of solutions inside and the extracction of copper. Any could help me Thanks a lot
Last replied to by SmartDog
Your main title was about heap leaching, while your actual words described column modelling.  These are different things.  That said, to model either one you will need to study Computation Fluid dyn...
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Started by vaheedghassemy
help please.I need fundamental information  about solvent extraction of copper . i want to design a factory to produce 1000 kg/day copper cathode . cu in PLS is 2.5 gr/lit. please help me. thanks 
Last commented on by vaheedghassemy
thanks dear for your help.
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Started by Rahel John
CIL leaching...to know the amount of cyanide that can be consumed during leaching an ore contain 16% sulfur and less than 5000ppm copper  
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Started by Millza79
Is there a particle size where agglomeration is NOT required prior to heap leaching? I am reading a testwork report, where the fine fraction (half inch) was  agglomerated, but the coarse size fraction 92 inch) wasn't agglomerated.
Last replied to by SmartDog
A simple answer is that particle size and shape are two important parameters in optimizing heap permeability. Without agglomeration, fines clog spaces between larger ore particles in the ore bed, prev...
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Started by viyana
hi we have hot filter cake (from zinc plant residuals) and it contains 1-2% Co and 12% manganese, i am going to recover cobalt by solvent extraction with D2EHPA, now, I need some references about design of solvent extraction plant, Is there anyone t...
Last replied to by viyana
thanks dear Todd i have done tests in lab, we select reduction leaching of cake for Co liberate with acid and H2O2, now i need some information about industrial design of circuits and relation calcul...
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Started by Seeker
Please help! What chemical reaction takes place when gold bearing iodine solution ( iodine+potassium iodide+gold ) is treated first with sodium hydroxide and then ascorbic acid? Thanks!
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Started by ksherren
I am looking for information from anyone who is using thiourea in conjunction with NaCN and NaOH in their Au/Ag elution circuits. We are experiencing problems with eluting Ag and I am wondering if Thiourea could be the problem? If not, any thoughts o...
Last commented on by ksherren
Thanks Jorge. We perform an atmospheric strip at approximately 98 C. Higher temperatures would undoubtedly increase performance however not possible with the present infrastructure. There is thinking ...
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Started by Nogard
Is there a cost effective method/way to process gold tailings that contain mercury?   Thankyou
Last replied to by RtPG2019
What is the grade of your tailings? You may need to do a highlevel study to assess the economics.
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Started by Seeker
What is the best chemical way to recover tin and lead separately from the solution containing chlorides of lead and tin? How to recover lead and tin separately from the solution containing chlorides of lead and tin through electrodeposition? Thanks...
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Started by Seeker
I need a reaction vessel to remove tin, lead and zinc impurities from copper powder using HCL purity 35%. The temp. can reach up to 100°C or even more during reaction. Kindly suggest what grade of steel or some other metal can I use for this vessel?...
Last commented on by Seeker
Thanks!
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Started by kahonde
what is the use of Aluminium sulphate and Sodium sulphate in vat leaching or leaching of ores.
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Started by redcastle
I've been given the opportunity to acquire a gold deposit that has had some testwork for heap leaching done with decent recovery. Digging through the historical papers though I've found that the only problem is that it contains a high amount of clay...
Last replied to by redcastle
Cheers for your help andrew, your comments are making me more optimistic about the project, have you got an email If you didn't mind I'd love to chat a bit more about your experiences.   With the c...
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333
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Started by 14500477mada
Discuss the Procedures of; 1.Carbon-in-Pulp Extraction 2. Carbon screening and washing 3. Stripping
Last replied to by Jorge
Follow the links below, https://www.911metallurgist.com/blog/gold-cil-process-explained https://www.911metallurgist.com/carbon-in-pulp-process-examples/ https://www.911metallurgist.com/carbon-pulp-...
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280
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Started by Seeker
I had a gold cyanide solution that contained around 20 grams of  gold. I had used around 40 grams of commercial grade sodium cyanide to remove that gold using hydrogen peroxide. It was left in an open plastic container for quite a long time and so i...
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Started by hjkim
I want to refine 99.9% of palladium ingot to make more than 99.95% palladium spoge. The main impurities are iron and silicon. What kind of leaching solution( i thick nitric acid) to create a sponge? What other solution (ammonia?)should I mixed? I wou...
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Started by kahonde
I have a total of 10 tanks which are 50t each doing vat leaching,what determines my flow rate ?
Last replied to by SmartDog
The required retention time based on lab testing.
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Started by omer.canieren
Last replied to by omer.canieren
Hi Todd, I have tried fine grinding many times below 10 um. We could not take a good results. I need another method. Our sample does not contain so much sulfide. The problems are silica lattice and B...
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Started by Tawaz
Hie guys, I own a small copper claim with ores of up to 40% ( xrf ). I can't sell it as it is and I don't have the capital to buy any fancy equipment to beneficiate it. I am not a metallurgist, don't have a reliable lab to consult with and desperatel...
Last replied to by Tawaz
Hie steve, its been suggested that smelting could be an easier and cheaper route to take so I'll post on the smelting platform as well. Are you familiar with smelting.
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Started by Samuel Osei Annor
Please what can cause a depletion of dissolved oxygen in the leaching tanks
Last replied to by Todd H
What kind of leaching and what metals? Cyanide, acid, gold, copper? In gold leaching the cyanide dissolution reaction consumes oxygen and impurities like sulfides consume oxygen. Regards
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Started by Pillai
Hi I'm doing a trial with lead nitrate at the plant but it is not very successful.  i have a question, where to add, at first leach tank or pre leach tank ? is it make any difference between adding lead nitrate before cyanide added and after cyanid...
Last replied to by Kaume
Couple the Lead Nitrate addition with a good D.O level about 2 ppm and above. That might improve your results as well.
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Started by owor laban
Hello Members,  I'm doing a wolfram  project with average low grade of 0.1% W in tailings  and ore average grade of 0.5%W  and I'm thinking of designing and implementing the followings; 1. Introducing sluice box method to recover small size ore...
Last replied to by Jorge
Its's variable, for instance 4 to 6 degrees can give you some idea about the metallurgical response. The water flow has an impact on the concentration efficiency. Some additional information can be fo...
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Started by Millza79
What is the purpose of bleed streams in hydromet circuit like leach, solvent extraction etc?
Last replied to by SmartDog
In any circuit where there is a large amount of recirculation material builds up, whether it is fines/slimes solids or breakdown products from the chemicals (flotation, lixivants, etc.).  These degra...
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Started by ronnieverceles
I am doing some research for the smelting of DORE, I need some basic information on the cost of raw cathode gold containing 75% Au and 20% Ag in the DORE. Thanks  
Last replied to by Deano
Commercial stripping plants charge around $2250 Aust Dollars per ton of carbon. This covers the initial acid wash of the carbon through to the production of the gold on the cathode prior to aciding o...
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Started by ksherren
I am trying to determine how common it is for operators to pre-attrition fresh carbon prior to use in their circuits.
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248
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Started by Kaume
Hi guys  I am a Junior Metallurgist at a Gold plant, we have been experiencing overflowing leach tanks. By blending our pyrrhotite ore with calcrete, the tank levels drop. We have a train of 10 leach tanks, with the first 3 being the most problemat...
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Started by Seeker
Will sodium sulfite drop gold from sodium gold cyanide solution? Please also explain the reaction between the two. Thanks in advance!
Last replied to by Jorge
In the refining process adding chlorine gas or aqua regia, the dissolution process forms HAuCl4. It is possible to precipitate gold adding some reducing agents such as sodium metabisulphite, ferrous s...
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Started by BBM01720
Hi.  If HCL + CL is used as a leach; SMB is used to precipitate from auric chloride; the salt is HAuCL4  correct? I see I disintegrates when heated and also produces gold metal when heated further? Thanks.
Last replied to by BBM01720
I am also interested in onther green teks for gold ore leach.  Has anyone had luck with podered substitutes for extraction and percipitation from ore?

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