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

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

  • 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.

1
REPLY
56
VIEWS
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
If you know the slurry flowrate, you can determine the DO transported in the slurry. Usually, cyanidation is performed at a pH higher than 10.5 and DO higher than 6 ppm. Essentially, the rate of gold ...
1
REPLY
48
VIEWS
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...
3
REPLIES
98
VIEWS
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...
1
REPLY
71
VIEWS
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  
J
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/...
1
REPLY
107
VIEWS
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...
1
REPLY
117
VIEWS
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...
Last replied to by SmartDog
This is dpendent on the ore yoou have.  Also you need to factor in the effect of mining and crushing.  A good place to start is:   Introduction to Earthmoving  https://www.smartdogmining.com/note...
4
REPLIES
292
VIEWS
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
3
REPLIES
288
VIEWS
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
J
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...
1
REPLY
104
VIEWS
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. ...
1
REPLY
99
VIEWS
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...
4
REPLIES
312
VIEWS
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  
1
REPLY
151
VIEWS
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...
J
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...
2
REPLIES
129
VIEWS
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...
2
REPLIES
227
VIEWS
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.
3
REPLIES
166
VIEWS
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
2
REPLIES
196
VIEWS
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...
1
REPLY
167
VIEWS
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,...
3
REPLIES
175
VIEWS
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!
1
REPLY
163
VIEWS
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 ...
7
REPLIES
224
VIEWS
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!
1
REPLY
173
VIEWS
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
1
REPLY
166
VIEWS
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...
1
REPLY
273
VIEWS
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...
1
REPLY
182
VIEWS
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...
2
REPLIES
316
VIEWS
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
1
REPLY
355
VIEWS
Started by peter-colo
I have a non-magnetic concentrate consisting of monazite, xenotime and euxenite  rich in REE. This concentrate has locked and free values containing both PGMs and Au. I am investigating ways on how I could potentially leach the concentrate selective...
B
Last replied to by WTandC
Would getting all metals into solution and then selectively recovering the PGMs and Au and leave the REEs in the solution be an option?
1
REPLY
274
VIEWS
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? 
B
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...
1
REPLY
311
VIEWS
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
1
REPLY
213
VIEWS
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).
1
REPLY
340
VIEWS
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?
16
REPLIES
508
VIEWS
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...
r
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...
1
REPLY
274
VIEWS
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...
3
REPLIES
370
VIEWS
Started by Buurman
We have a shortage of O2 currently and air is not sufficient, we can't get H2O2 also. Will NaClO have any negative downstream effects if I use it on the gold extraction plant?
E
Last replied to by Erik
You can also investigate switching your grinding balls from forged to high chrome.
1
REPLY
323
VIEWS
Started by Adimulu
Hi all, We are operating gold plant , we use NaCN to treat gold bearing ore. Is it safe to burn the wooden container and plastic bag after use. Regards,
A
Last commented on by Adimulu
Dear Todd, Thank you so much it helps a lot. Regards,
2
REPLIES
331
VIEWS
Started by Nasrani
We are looking for expertise in the best grade of steel to use for pipeline a sulfuric acid with the following charactheristic : H2SO4 - 90% Operating Press. 1 Bar Diameter of pipe 1/2 Inch Normal operating temp. Any ad...
N
Last replied to by Nasrani
Thanks for your advice

Please join and login to participate and leave a comment.