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 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 po...
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58
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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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60
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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 replied to by Doubledeuce2020
Doubledeuce2020 I watched a you tube video using bleach and hydrochloric acid to liquify gold and stumpout to recover it well i lost all my gold and got gassed in the process
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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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84
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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...
Last replied to by SmartDog
As jore said, the color is probably due to copper.  Copper being soluble in cyanide can (usually) lead to excess cyanide consumption.  See: https://www.911metallurgist.com/blog/dissolution-of-precio...
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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!
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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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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. 😉  
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Last commented on by Adimulu
Thanks SmartDog
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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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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...
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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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223
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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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284
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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...
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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?
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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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239
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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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257
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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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426
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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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216
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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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558
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Started by Lazaro
Hello!! I want to know how can I determine if the leaching is complete or not during vat leaching  process of Gold, and if there is a method what are the chemistry behind that process.Thanks
Last replied to by Tich
Basic chemistry for color test is from the reactivity series,. in a gold solution if you add zinc,The gold will be displaced in the solution because Zinc is more reactive. Gold will deposit, the gold...
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303
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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?
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Last replied to by Erik
You can also investigate switching your grinding balls from forged to high chrome.
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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,
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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...
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Last replied to by Nasrani
Thanks for your advice
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323
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Started by Jeffreybch
Hello, I have several tanks where I leach (CIP) gold ore, the solid / liquid ratio is 40% solids.   The tanks are about 2 meters by 2 meters.  We have several air pipes adding air to aid the chemistry plus a central agitator. I’d really apprec...
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Last replied to by rob riggir
Best to talk to Mixtec in Perth. They have done good work for me in the past. Cheers
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325
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Started by Nand
Dear all,  I have a loaded D2EHPA phase with Cu, Co and Li and want to selectively strip them by controlling the equilibrium pH (with H2SO4 mainly). I have some selectivity but I want to increase it by using multiple counter current stages in a mix...
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Last commented on by Nand
Thank you very much Todd, I already contacted Cole, will do the same for Omega!
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491
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Started by Seeker
Do Rhodium, Palladium & Platinum make their hydroxides in the molten sodium hydroxide? Please help! Thanks in advance!
W
Last commented on by Wieslaw Wodecki
Dziękuję David za wyjaśnienie skąd wzięło się przekłamanie. Niestety translatory nie zawsze dobrze tłumaczą zwroty techniczne.
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411
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Started by Seeker
I have 10 grams of gold in 3 liters of sodium cyanide solution. I want to recover it with coconut shell based granular activated carbon-size 2.36 mm. How much carbon (by weight) do I need to recover this gold? I would be burning this carbon for go...
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Last replied to by rob riggir
Be careful burning the carbon as you can lose some of the gold in fly ash. Best to ash it slowly in a muffle furnace and then smelt with fluxes to remove impurities. Cheers
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Started by MatthieuPrivat
The main fluorochemical reagent for acid mist suppression will be discontinued next year after facing envirronmental issues. The alternative seems to be Mistop, a 20 years experienced solution, sustainable, currently used in several operations worldw...
M
Last replied to by MatthieuPrivat
Hi Todd, Mistop is for Cu and Zn EW. It is recommended to use Mistop in addition to mechanical barriers like floating balls. 3M FC-1100 solution is going to be discontinued soon. 
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504
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Started by Mondu Akura
I am looking for Hydrometallurgical options to extract gold from Calaverite or Gold-Telluride using conventional leaching techniques instead of sending concentrates (esp. of froth flotation) to further pyrometallurgical pretreatment prior to leaching...
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Last commented on by Mondu Akura
Gratitude with appreciations SmartDog. The link proves more than helpful, almost solved my problem. I will conduct leach tests basing on the options presented in the link, maybe altering leaching para...
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627
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Started by Dossa
How can i recover gold from refractory gold ore having high content of sulfur by chemical treatment?
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Last replied to by metallurge
The best (environmental friendly and efficient) method would be the roasting process. in the roasting process energy from oxidation can be recovered as steam / electrical power and the sulfur is conve...
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565
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Started by TEEKAY01
Anyone to assist with plan drawings or schematics for 10-30 tonne vat leaching tanks
Last replied to by David
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563
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Started by Gabriel
We will start a RIL operation and we will use kerosene to passivate carbonaceous matter. I would like to know if there is any method of kerosene analysis.
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Last replied to by Jorge
You will use kerosene and an ion-exchange resins to adsorb the gold. There are not many operations using a resin process (RIP, RIL or RIS). The advantages of the resin over activated carbon are the be...
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491
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Started by Samuel Trindade
Hello Gents! I've occasionally facing some recovery problems. I've done some diagnostic leaching tests and it seems to have encapsulated gold in sulphide. Crossing a lot of process data I've noticed a subtle relation between increasing in tailing gr...
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Last replied to by Jorge
It is important to know the gold grade reported in tailings. You did not provide that data. Now, considering the fact that you have a refractory gold ore, it is possible that the distribution and cont...

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