Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction

Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction

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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...
T
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...
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637
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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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716
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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...
K
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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586
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Started by Nogard
Is there a cost effective method/way to process gold tailings that contain mercury?   Thankyou
R
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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715
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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?...
S
Last commented on by Seeker
Thanks!
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631
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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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950
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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...
S
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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866
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Started by 14500477mada
Discuss the Procedures of; 1.Carbon-in-Pulp Extraction 2. Carbon screening and washing 3. Stripping
J
Last replied to by Jorge
Follow the links below, https://www.911metallurgist.com/blog/gold-cil-process-explained
Carbon-In-Pulp Process Examples
https://www.911metallurgist.com/carbon-pulp-...
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633
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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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576
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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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634
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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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593
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Started by omer.canieren
Ö
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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704
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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...
T
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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984
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Started by Samuel Osei Annor
Please what can cause a depletion of dissolved oxygen in the leaching tanks
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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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786
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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...
K
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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685
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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...
J
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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1348
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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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734
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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  
D
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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543
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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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691
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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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847
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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!
J
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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588
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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.
J
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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719
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Started by shastry
Hi, Please suggest  how best we can separate fine carbon and trash from slurry, as we are having old methodology like wedge wire screen.
D
Last replied to by DwoodFLS
Do you have more details on the fine carbon?  Do you have p80 on the carbon?  this would be useful to determine if it can be recovered effectively by the Wedgewire screens. Density Separation migh...
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880
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Started by Millza79
For treating refractory gold ore, what is the minimum sulphur/sulphide grade required for a BIOX circuit? Thanks
J
Last replied to by Jorge
It can be mentioned that the sulfide sulfur content of the material is a key factor in the design of the leaching system. If there is low-sulfur material,
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841
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Started by Raghuveer
Hi, is there any handbook available online, which I can download for basic ball mill sizing for mineral processing application?
Last replied to by David
https://www.911metallurgist.com/blog/eq https://www.911metallurgist.com/blog/ball-mill-design-power-example-calculation
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632
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Started by m_aazami
Greeting recently we started the design of a iron ore pelletizing plant using rotary kiln method (alis chalmerz technology). the S content  of iron concentrate is about 0.2% and we want to reach to less than 0.008% in the pellet product. but the ...
Last replied to by SmartDog
Without seeing the process flow diagram the first thought would be the basic temperature differences in the process.  The Allis Chalmers process using a rotary kiln is used to sinter the pellets, par...
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980
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Started by Raghuveer
Hi , This is Raghuveer from DRC congo. I work for Copper processing plant, we are installing Co/Cu processing plant. I have a query on the rubber lining of stainless steel tank. Need tp select the rubber lining material on stainless steel tank of HBF...
J
Last replied to by Jorge
I think a good choice is ebonite hard rubber because of its good chemical and abrasion resistance. Also good ageing stability
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673
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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...
J
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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908
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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...
J
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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607
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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?
J
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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579
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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...
J
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...
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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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719
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Started by alimrtdha
how to know the ideal number of stage required to remove gold in CIP process
T
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...
H
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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