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 Rutendo Praise
I have a few tons of china clay, and a sample showed good results, but then the clay is fine and may give me problems processing it. Is heap leaching the best way to have the highest recovery?
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Last commented on by Rutendo Praise
Thank you
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Started by Ajouhi
We operate a CIL plant (8000 t/d), we recover fine carbon after elution and regeneration. I am concerned that the fine carbon recovered after screening the regenerated carbon has a higher grade (1000 ppm) compared to the eluted sterile carbon (100 pp...
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Last replied to by Jorge
It is well known that most of the gold absorbed by activated carbon can be removed during elution. But it is also possible that the carbon has the Ca(Au(CN)2)2 complex present, which can be partially ...
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Started by Anudari
Hello all, I am working as a metallurgist first time after graduation in Gold processing company. But I have learned that this processing plant has many issues that needs to be solved immediately. Because the plant does not have waste pond or someth...
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Last commented on by Anudari
Thank you for your advice.
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Started by koki
when harvesting silver from silver cell it looks like semi muddy not solid crystals, what might be possible reasons for this
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Started by Metallurgystudent
Good day to all! Please provide a hand.   What is the most secure way to separate iridium from osmium metal?
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Last commented on by Metallurgystudent
Thanks a lot for your help.
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Started by ecublens
Hello, there is some arsenic in an oxidized gold ore analysis. It is not in the form of arsenopyrite. I thought it was acting with antimony, but the Sb content is also very low. Could you give an idea what the arsenic here might be acting with?
J
Last replied to by Jorge
Other possible arsenic minerals could be Orpiment (As2S3) and Realgar (As4S4). If the ore contents silver, proustite (Ag3AsS3)
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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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Last replied to by Jorge
Trying to remove the fine particles is useful partially. Traditionally, emitters need an intense use of Antiscalant, and they require the use of in-line filters to minimize the clogging problems. For ...
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Started by simon@p
Hello. There is a batch agitation tank that we are operating as a pilot for our ore. The  problem is that we have been getting a problem of inconsistence in carbon results as they may reach example 380 Au ppm then later on with a good recovery fro...
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Last replied to by Jorge
It is important to know the gold extraction from bottle roll tests. Sometimes, tests are not performed correctly and some factors such as the presence of small contents of pre-robbers is not evaluated...
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Started by canerdogan
Hi, How to i know the ore is calcined or not at the roasting stage before heap leach process. 
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Last replied to by Jorge
Roasting is considered a pre-treatment before Carbon-in-Leach Process to treat a refractory gold ore. It is necessary to perform a testing program to determine the effect of particle size (e.g. 70, 50...
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Started by Timey
I would like to recover Barium, Scandium, Strontium, Lanthanum, Yttrium, Vanadium from the same ore heap. Please advise on the best process, or help with flowsheet diagrams and materials. Thanks
Last replied to by SmartDog
You are generally looking at a multi-stage process.  The first, and easiest, is using trommels, crushers, clasiufying scrubbers and flotation to concentrate the desired minerals.  This is followed b...
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Started by ecublens
Hello, How can we calculate the amount of cyanide (g) that needs to be added after titration in the bottle roll test? 
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Last replied to by Jorge
As you know the volume of leaching solution, you can know the NaCN added initially. For example, NaCN addition 1 g/L, and the volume was 500 mL. In this case you added 0.5 g of NaCN. The titration pr...
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Started by ecublens
Hello, I need a procedure that explains how to do the cyanide column leach test in detail. I would appreciate it if you could share it with me.
Last replied to by SmartDog
A quick search of this site (outside the forum area) will provide most of the test procedures you are looking for, such as https://www.911metallurgist.com/blog/column-leaching-procedure
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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 ...
Last commented on by SmartDog
Depends on tank size, particle size, solids concentration, agitator size, agitator blad configuration, and agitator transmission/belting. Also wether you are trying for high shear or low shear mixing...
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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 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...
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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...
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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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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 ...
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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...
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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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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
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Last replied to by AJ
Thanks for that guys, it was very helpful AJ
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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!
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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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