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 saeidar
Hi everyone. I want to remove Strontium from barite ore. I would appreciate if you help me in this regard.
W
Last replied to by Wieslaw Wodecki
Dzień dobry. Jaki minerał tworzy Sr w tym barycie i ile go tam jest. Pozdrawiam Wiesław 
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Started by pz
Hi everyone. I wonder how is oxidizing gas (O2/air) flow rate is calculated for the atmospheric cyanide leach. I have experience with pressure oxidation of sulfides. The calculation method is very straightforward. First – calculate stoichiometric ...
J
Last replied to by Jorge
Dissolved Oxygen
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Started by WTandC
I have read the leach emitters can be subject to clogging from recirculating suspended solids. Would removing all suspended solids >1 micron be a significant improvement for the leaching circuit?
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Started by simon@p
I would like to ask about the state of gold in eluant and it's chemical formula if any
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Last replied to by Jorge
Basically, the elution or stripping of activated carbon is performed to get a high-grade gold cyanide solution (eluate), which is treated by electrowinning or some cases by cementation. During the elu...
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Started by idahalen
I am currently researching Nickel hydrometallurgy and I am looking to understand the hazards on a HPAL circuit, specifically the Fleaters and Autoclaves.  I understand that under certain conditions autoclaves can explode but I do not see how this ca...
Last replied to by SmartDog
An autoclave operates at elevated temperature and pressure.  Basically it is an industrial pressure cooker, so yes heat is invloved often by use of steam.  Like any pressure vessel, if the sealing m...
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Started by Eng. Cosmas Wambura
Hello Friends, some one help me the way to obtain the tonnage of round vat tank; As i know; Vol. = (pi*D²*Height)/4 To obtain mass , i use Density = mass/volume Now; if this formula is correct, what is the density of raw ore? Else; if it`s not...
s
Last replied to by simon@p
The Formula is correct  From there find the bulk density of your ore by filling in a known volume the ore without compaction then measure the weight of the ore 
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Started by graeme23miller
i am looking for anyone with experience in selecting materials of construction in high concentration chloride brine.  we are doing a class 5 feasibility study without any corrosion test work. as a result the selection of materials are generally non-...
Last replied to by SmartDog
Some of it comes around to the volume of material you will be handling on a hourly and daily basis.  There are some ootb thoughts that can be used if proper care and thought is used.  First though j...
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Started by ManUtd67
What are the best options to prevent build up of sticky material in a drum agglomerator.  This is an acid agglomerator.  Build-up of a ring of material occurs part way down the agglomerator between the acid spray pipe and the water spray pipe. (See...
G
Last replied to by graeme23miller
from the look of your agglomerator the water addition is too high=> very sticky materials and build up. this is due to the moisture addition being at or even slightly above the material max stickin...
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Started by ecublens
Hi guys, what is the difference between activated carbon adsorption and zinc cementation (merrill crowe)? How are these methods selected in a newly established gold enrichment facility? Thank you  
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Last replied to by Jorge
Follow the links below to get information on activated carbon and zinc cementation, https://www.911metallurgist.com/blog/gold-cil-process-explained https://www.911metallurgist.com/equipment/...
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Started by Austin Muvimi
Hi guys. May you please school me on how to culculate the optimum mechanical agitator rotation speed in gold CIP plants taking into consideration the tank size and pulp density   Thanks in advance
Last replied to by SmartDog
The normal process is to use the coarsest particle size expected and then determining the minimal settling velocity for that size given the pulp specific gravity and partical specifc gravity.  This g...
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Started by Eng. Cosmas Wambura
Controlling Copper is a big problem at my site, so I need help on which reagent can I use in the cyanidation of gold. Which reagent can I apply to control Copper in old vat leaching?
C
Last commented on by Eng. Cosmas Wambura
Chalcocite, malachite and/ azurite
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316
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Started by CharlieAlAfensh
There is a solution that contains sodium chloride and potassium chloride, and we want to dissolve the largest possible amount of potassium chloride in the solution
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Last replied to by Jorge
If you try to smelt the concentrate, the dore bar would content gold and base metals. The gold grade has an impact on the dore bar quality. You should study carefullly the content of base metals in th...
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Started by OGUZTURE
Hello dear friends, Proffessors We have a factory that recovers precious metals from electronic waste. Here we first shred the motherboards of electronic scraps. And we separate the parts. We throw the precious metals in a furnace and melt them. We ...
J
Last replied to by Jorge
I think, you could try this process. After crushing the electronic scrap, it is important to separate the iron parts using a magnetic separator. The non-magnetic material is treated with nitric acid. ...
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Started by awunderl
Looking for any resources or research on chalcopyrite leaching for recovery vs particle size.  Looking to see the effect of different particle size distributions on a copper recovery curve for run of mine material.  Focusing on larger size fraction...
J
Last replied to by Jorge
The application of chalcopyrite leaching has been studied for a long time, but the economy and metallurgy performance are complex. For example, the effect of particle size on copper extraction in sulp...
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Started by Fahmy
Hi guys, I’d like to know what does the blue color indicate in the barren solution from VAT leaching, plus excessive dropping of cyanide concentration, I understand this occurs from the presence of higher amounts of other metals in the ore, but I d...
H
Last replied to by Zimbo
herewith a photo  
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Started by Crisady
Can you tank gold amalgamation tailings straight to the regrind and the to cip without passing through vat leach and still achieve the same recovery.Iam just brainstorming on ways to cut costs without losing my gold.Can someone assist from experience...
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Last replied to by Jorge
You can repulp and leach the tailings from amalgamation process. Artisanal miners are used to use mercury to recovery free. Tailings from this process are sold to cyanidation plants designed to operat...
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Started by ca1
Hello, We operate a small carbon in pulp plant without thermal reactivation abilities.  We would like to find solutions to recover our process solution after it has been discharged to the tailings.  Are anionic flocculants considered to be pore b...
Last replied to by SmartDog
As operations move to closed water circuits, matching the right flocculent to the leach circuit is an important issue. The chemistry of the whole process can become rather complex. While the flocculen...
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258
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Started by DY
Hello, All I can't find optimal solid / liquid ratio for processes intensive gold cyanidation at Consep Acacia unit, Gekko Inline Leach Reactor and Sepro Leach Reactor. Where I can find this information? May be somebody know this information.
D
Last commented on by DY
Thank you! It is very useful.
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Started by AJ
In adding lime for cation bonds in an agglomeration barrel (as well as portland cement), what type of lime is this - ag lime (fine crushed limestone), quicklime or hydrated lime? Thanks Andrew J
A
Last replied to by AJ
Thanks for that guys, it was very helpful AJ
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280
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Started by Seeker
I want to recover ruthenium metal from ruthenium hydroxide. Ruthenium hydroxide reaction with nitric acid gives ruthenium crystals and some part of it is dissolved in nitric acid. Would it be correct if I first completely dissolve ruthenium hydroxide...
S
Last replied to by Seeker
Thanks for your help! I read somewhere that during the separation process (in certain chemical reactions) ruthenium tends to explode if not handled properly. So, please guide me if the following rut...
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Started by Millza7979
Are coarse bottle roll tests a good way of simulating column leach tests? Do they tend to get the same gold recoveries?
Last replied to by David
Because column tests a lengthy and costly, you minimize your risk/cost before jumping in. The coarse bottle roll test is just a leach response test. If you get nothing with a coarse bottle roll test,...
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Started by Seeker
Please help! I want to know the method for recovering precious metals such as platinum, palladium rhodium from catalytic converters. Thanks in advance!
S
Last commented on by Seeker
Thanks for the help!
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Started by jmambsu
In CIL/CIP, what is the minimum density difference (carbon vs. pulp density) where the carbon will start to settle? And the limits of agitation on carbon settling?
J
Last replied to by Jorge
The design of CIL and CIP usually comprises six or more leaching tanks to perform the required gold dissolution and adsorption using activated carbon, which should be distributed properly through the ...
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Started by Seeker
Somebody, please help me!  I want to know about the recovery of precious metals from the spent catalyst  used in the manufacturing of lubricants. Thanks in advance!
S
Last replied to by Seeker
Thanks for your quick reply. This catalyst was used by the company that manufactures engine oils. So, can its hazardous gasses be burnt inside the furnace that I am supposed to use? Thanks!
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Started by Adimulu
Hello , Is mineral processing industry ready for industry 4.0 , smart plants that can respond in real time or close to real time and use machine learning. It could be more productive ,fun and fascinating to see this in mineral processing. 😉  
A
Last commented on by Adimulu
Thanks SmartDog
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193
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Started by Austin Muvimi
Can someone please help me on how to calculate leach residence time, adsorption residence time and pulp retention time in CIP
Last replied to by SmartDog
Is this for an existing operation where you want to know what is going on or for a new operation? If it is an existing operation an approximation can be made by knowing the flow rates and the volumes...
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290
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Started by Han
First of all,for the processing of gold and tellurium ores,how exactly does the pos-roasting(calsine ores contain % 60- 62 Fe ) process work,what is the way to obtain tellurium. Second,which do you prefer for chemical analysis,aquea regea or fire ass...
J
Last replied to by Jorge
There are two main gold-telluride minerals, calaverite and sylvanite. Regarding the calaverite, if the ore is heated to around 510 oC, then, the gold and tellurium are separated producing tellurium di...
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Started by Ceverett
Has anybody tried using a peristaltic pump to transport carbon using little to no water? Our concern is that the carbon will grind against itself and fracture into smaller pieces that make be lost to the undersize of our tailing screen. 
Last replied to by SmartDog
The issue of carbon degrading due to pumping at high solids concentrations is an issue regardless of the type of pump.  Centrifugal pumps can exacerbate this with the impellor and additional grinding...
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Started by WTandC
In a review of an existing gold operation the PFD shows their SART circuit after the CIP and cyanide thickening circuits. As CNCu complexes are an issue can the SART circuit be placed after the leach circuit and before the CIP circuit?
Last commented on by SmartDog
CIP = carbon in PULP
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Started by martie
Hello! Can anyone please explain to me why the presence of titanium is a challenge during the separation of rare earth elements by SX? 
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Last replied to by WTandC
Is there more than one vendor/SX solutions provider saying titanium is an issue? Is it impacting recovery of all REEs or just some of them? I have not come across any literature saying this is a chall...
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Started by Austin Muvimi
Hi guys. I want to start Vat leaching. Bottle roll results are Au 2.6g/t and Cu 15.2g/t. Is there a method of calculating the amount of cyanide to be mixed in the make-up tank according to the required cyanide strength in relation to the amount of wa...
Last replied to by David
https://www.911metallurgist.com/blog/bottle-roll-leach-test-leaching-procedures
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Started by alonso771
Hi everyone, I'm looking for a paper that is mentioned on this website,
Hydrochloric Acid Copper Leaching
The paper is: Harvey, W. W. and Dudas, F. O., “Hydrochloric Acid Leach Processes for Copper Concentrates,...
Last replied to by SmartDog
The link you posted IS the preprint.  Alternatively you can download it form https://www.onemine.org (charges an access fee).
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Started by Mining Mogul
Hello im leaching my sands with a grade of 2.25. Head has been reporting above 2.83g/t for more than 7 days without without reducing, the tail is 0.02 and 0.00 in some days. Cyanide strength is at 0.2%. What do I do to reduce the number of days leac...
Last replied to by SmartDog
What does your test work show?  Compare how you are operating against the lab & pilot testing.  You did do lab & pilot testing didn't you?
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Started by Philipo
Hello Guys;I work at a CIP Gold processing plant. Currently the CIP tank has a problem with the slurry flow. There are 9 tanks, 2 leaching and 7 adsorption. Slurry from some tanks donot flow to the next tank, like from tank#7 to tank#8. Besides the d...
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Last replied to by rob riggir
Hi Philipo, Just a further comment on tank agitators; Tank agitators should be designed to fully suspend the slurry in the tank by themselves and also to re-suspend settled solids after a power supp...
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Started by martie
Hello, I am undertaking a study on the dry digestion of high silica slags from the electric arc furnace. Does anyone have any knowledge on the impact of having a major amorphous component in the slag on the performance of dry digestion/ leaching? Or ...
J
Last replied to by Jorge
There is a typical problem when you try to leach slags using a hot process. I mean, the formation of silica gel, which increases the slurry viscosity, promotes the presence of colloidal particles, mak...

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