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
  • To participate in the 911Metallurgist Forums, be sure to JOINLOGIN
  • Use Add New Topic to ask a New Question/Discussion about Hydrometallurgy.
  • OR Select a Topic that Interests you.
  • Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent).
    Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.
  • Use Add Comment = to comment on someone else’s Reply in an already active Topic/Discussion.

2
REPLIES
125
VIEWS
Started by ManUtd67
Hi, I am looking for operating experiences for controlling and minimizing copper loading on activated carbon in a gold CIP circuit. The project under consideration is still in design phase.  The ore has some copper associated with chalcopyrite whi...
Last replied to by Reactor
Hello, If you are still in design mode we may be able to help. We have many years of success with in-solution metals and cyanide recovery using membranes. Regards, Bill
2
REPLIES
180
VIEWS
Started by Reactor [closed]
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)?
Last replied to by Reactor
Thanks Todd.
1
REPLY
411
VIEWS
Started by Rahel John [closed]
CIL leaching...to know the amount of cyanide that can be consumed during leaching an ore contain 16% sulfur and less than 5000ppm copper  
Last replied to by Todd H
Test work will reveal all!  Consumption depends on the mineralogy not the element grades. Regards Todd
1
REPLY
181
VIEWS
Started by simon@p [closed]
can ammonia be used as an alternative to remove copper from gold loaded carbon instead of cold cyanide wash
Last replied to by Todd H
Maybe but if you mix the chemcials you are going to have a hard time keeping them separate.  Acid washing prior to elution is the most common method.  Cold cyanide may cause the loss of some gold. ...
1
REPLY
181
VIEWS
Started by AJ [closed]
Good Morning all, Using a Zadra elution circuit at what temperature does a cold strip become a hot strip and what are the essential differences between the two.
Last replied to by Todd H
130 degrees C is typical for normal stripping - anything below boiling would be considered a cold strip per se.  This comes down to atmospheric stripping vs pressure stripping really not temperature....
1
REPLY
97
VIEWS
Started by WYOMing Prospector [closed]
Have read several studies where it is known that citric acid will dissolve 15 of the rare earths into solution.  Question I have is what liquid can I use with the citric acid for solution and then to precipitate them back out what is the best method...
Last commented on by WYOMing Prospector
I was looking at a study where they used D2Ehpa in solvent 70 and recovered 15 ree with 95 % efficiency. Granted they would all be conglomerated. But couldnt they then be sent to a refinery to furth...
1
REPLY
232
VIEWS
Started by JdmJeremy [closed]
I came across an old operation on government property that appears open to claim (I will verify before removing any minerals). Background: I know nearly nothing about cyanide leach. Here are a few details that I found in mining reports and other do...
Last replied to by Todd H
Yes it is safe to sample, and the gold would be still there because if it leached the rain would have washed it out years ago. Cyanide breaks down to carbon and nitrogen species and any gold complex ...
2
REPLIES
166
VIEWS
Started by Ninontrans [closed]
pleasei have a gold ore that has a high copper content 1.52%, Sulphur of 0.12percent, silver of around 102grams per ton, how do I go about recovering the gold in the ore. I tried panning but it was not effective. 
Last replied to by Todd H
What have you tried?  At that copper grade it is a copper ore and you could make a copper flotation concentrate to capture the majority of the copper and gold.  The copper concentrate can be sold di...
1
REPLY
68
VIEWS
Started by graeme23miller [closed]
I am trying to source data on the conductivity of copper electrowinning electrolytes: Cu 30 - 50 g/L, H2SO4 150 - 180 g/L & 50 Celsius.
Last replied to by Todd H
Why?  The baseline EW parameters apply to almost all copper solutions unless there is significant iron or other impurities in it. https://pubs.acs.org/doi/pdf/10.1021/je8001255 https://www.nrcresea...
2
REPLIES
99
VIEWS
Started by Dossa [closed]
how can the ore described below be pre treated in order to achieve high gold recovery using VAT leaching plant? arsenic 9382ppm,sulfur 42679.67ppm and gold 6.26ppm
Last replied to by Todd H
Step 1 is always lab testing!!!!  This ore may or may not need pretreatment but leach tests will tell you.  Pressure oxidation, biological oxidation etc will follow once you know the baseline leach ...
1
REPLY
263
VIEWS
Started by ManUtd67 [closed]
Considering a gold processing plant that is processing ore that contains some copper (chalcopyrite).  Copper in the ore is around 300-1000ppm. The flowsheet includes a gravity circuit and so expect the gravity concentrate to also contain elevated c...
Last replied to by Gene Cheeseman
Luckily, chalcopyrite is not very soluble in cyanide and its relatively low SG means it won't be in very high concentrations in the gravity concentrate.   It's the other copper minerals you need to...
1
REPLY
356
VIEWS
Started by Millza79 [closed]
For a resin-in-leach gold application, is there that if you overdose kerosene addition, you will blind the resin?
Last commented on by ManUtd67
Unlikely you will blind the resin.
1
REPLY
341
VIEWS
Started by Wadzanayi [closed]
Hello Process Engineers In a CIL circuit, does pre-aration to increase DO levels, always result in  the benefits of  reduced cyanide consumption improved gold recovery  
Last replied to by Todd H
Preaeration does not always result in benefits but it will not hurt the process.  Typically it is used when you have high cyanide consumers such as sulfides and the preaeration oxidizes the surfaces ...
1
REPLY
224
VIEWS
Started by Wadzanayi [closed]
I hope that I find you well.    I would like to know the differences in performance if  any, between Norit and Coconut based hydrocarb activated carbon for adsorption in a CIL circuit. The major issue is the difference in the cost between the t...
Last replied to by SmartDog
Every operation is different and no general answer will be always correct.  The only way to know for sure is to do lab testing or even pilot testing.
1
REPLY
561
VIEWS
Started by Seeker [closed]
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...
Last replied to by Todd H
You may be able to change the chloride concentration and cause the lead to precipitate first.  Or - Lead contamination is especially bad for gold alloys, small amounts of lead gives alloys that easi...
1
REPLY
261
VIEWS
Started by mashafaei [closed]
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...
Last replied to by Todd H
If you google bioheap leaching for copper you will find a lot of articles on the subject.  Here is one link https://www.911metallurgist.com/blog/wp-content/uploads/2015/12/Thermophilic-Bioheap-Leach...
1
REPLY
239
VIEWS
Started by JPExit [closed]
Would there be a significant difference in Carbon Activity results if I use a Hot Plate  rather than an Oven to dry carbon samples prior to Carbon Activity Determination Test?
Last replied to by Todd H
It should be ok to do this but I would avoid direct heat - place a spacer like a  couple of glass rods between the beaker bottom and the hot plate.  Cover the beaker with a watch glass to allow even...
1
REPLY
182
VIEWS
Started by CA [closed]
Hello. We operate a small scale leach plant in a region where it is difficult to find hydrated lime for us in pH control.  We tend to only have access to a milled lime ore (artisinal) that comes from local sources. We are dealing with a very acidi...
Last replied to by Jorge
You can use sodium hydroxide instead of lime. Many CIL operations add NaOH to get an alkaline pH (10.5-11.0) in the cyanidation circuit.
1
REPLY
280
VIEWS
Started by Praymore [closed]
What is the best mesh size of activated carbon to use for gold adsorption in a CIL/CIP circuit comparing 6*12 and 8*16 Carbon? Does the mesh size affect the desorption rate of gold?
Last replied to by Jorge
There are some problems depending on the ore type. It is important to perform abrasion tests to evaluate the carbon. Follow the link below, https://www.911metallurgist.com/hydrometallurgy/carbon-loss...
1
REPLY
210
VIEWS
Started by Millza79 [closed]
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 commented on by Millza79
Thankyou.
1
REPLY
247
VIEWS
Started by Millza79 [closed]
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 ...
1
REPLY
279
VIEWS
Started by Edson aman [closed]
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 ...
4
REPLIES
352
VIEWS
Started by simon@p [closed]
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...
1
REPLY
349
VIEWS
Started by jonas chihoyi [closed]
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...
1
REPLY
384
VIEWS
Started by Jaime Jacob [closed]
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...
1
REPLY
350
VIEWS
Started by vaheedghassemy [closed]
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.
2
REPLIES
464
VIEWS
Started by Millza79 [closed]
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...
2
REPLIES
437
VIEWS
Started by viyana [closed]
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...
0
REPLIES
300
VIEWS
Started by Seeker [closed]
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!
1
REPLY
429
VIEWS
Started by ksherren [closed]
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 ...
2
REPLIES
412
VIEWS
Started by Seeker [closed]
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!
0
REPLIES
326
VIEWS
Started by kahonde [closed]
what is the use of Aluminium sulphate and Sodium sulphate in vat leaching or leaching of ores.
3
REPLIES
508
VIEWS
Started by redcastle [closed]
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...
1
REPLY
473
VIEWS
Started by 14500477mada [closed]
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-...
0
REPLIES
367
VIEWS
Started by Seeker [closed]
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...

Please join and login to participate and leave a comment.

BUY Laboratory & Small Plant Process Equipment

We have all the laboratory and plant equipment you need to test or build/operate your plant.

ENTER our Mining Equipment' Store

We Sell EQUIPMENT for all types of Mineral Treatment PROCESSES and Laboratory Testing needs

Do you need METALLURGICAL TESTING of your ORE?

View the Services we Provide

911Metallurgist Mineral Processing & Process Development Laboratory

We have a metallurgical test for every possible mineral type and treatment.

Need ENGINEERING Services or Plant TROUBLESHOOTING?

We can IMPROVE ALL PLANTS / Mineral Processing Engineering & LABORATORY Ore Testing

911Metallurgy Engineering

Contact us for process engineering, metallurgical investigations, plant optimization, plant troubleshooting, needs. WE “FIX” METALLURGY.

I Need Consulting Engineering Help