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 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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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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139
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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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227
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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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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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483
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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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162
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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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236
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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?
E
Last replied to by Erik
You can also investigate switching your grinding balls from forged to high chrome.
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200
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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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206
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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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227
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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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264
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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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415
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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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333
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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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705
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Started by redcastle
I've posted here before about a project I've got that has problems with high clay content requiring large cement addition for percolation. Part of the testwork looked at simply crushing it and agitating in a vessel and it got decent recovery. I was ...
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Last replied to by rob riggir
Vat leach is really only good for high grade, low throughput -  1 man and a dog type operation.  For the grade and clay you have you should just go for standard agitated leach and activated carbon ...
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326
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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...
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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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627
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Started by oro
I recently built and started up a small CIP plant and came across this simple titration calculation recommended by A K Williams.  The math is simple and I assume the formula is accurate - but would like to confirm.   As follows: 1. make up 1 liter...
L
Last replied to 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
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433
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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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515
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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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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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431
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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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439
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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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383
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Started by Paulo V
Hi, I have been doing cyanide leaching test for samples obtained from piles of a material that has been weathered for months.  The recovery achived was from 60-80% for direct leaching of the head and 90-95% for gravimetric concentrates obtained fro...
Last replied to by SmartDog
Sodium hydroxide and or lime
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844
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Started by JdmJeremy
I came across an old operation on government property that appears open to claim (I will verify before removing any minerals). Background: I know nearly nothing about cyanide leach. Here are a few details that I found in mining reports and other do...
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Last replied to by JdmJeremy
Update: I collected some samples from the mining area. There is no visible gold in the ore. However I tossed a few chunks into a fire pit and the next morning there were significant gold color specs. ...
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383
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Started by Graeme
I am looking to conduct a brine leach on a Pb-Zn-minor Ag ore, could someone please give advice/pointers (for eg: what acid to use?).   Thanks
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Last replied to by Jorge
It is possible to perform acid brine leaching tests to evaluate the metallurgical response. The key reagents are sulphuric acid and sodium chloride. For example, the acid sulphuric strength can be 5 g...
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651
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Started by Dossa
how can the ore described below be pre treated in order to achieve high gold recovery using VAT leaching plant? arsenic 9382ppm,sulfur 42679.67ppm and gold 6.26ppm
Last replied to by Miya
find some lab to run the leaching test
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551
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Started by oro
I need to setup an alkaline drip for a 1 t/hr solids feed to a small CIP plant.   What is the most practical method to do this considering the low solubility of hydrated lime?  I was wanting to use a 55 gal plastic drum but realize 400-500 grams ...
J
Last replied to by Jorge
Many small scale gold operations in South America are used to add NaOH in the CIL or CIP circuit. You can prepare a solution and add it in different points. 
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Started by Ninontrans
pleasei have a gold ore that has a high copper content 1.52%, Sulphur of 0.12percent, silver of around 102grams per ton, how do I go about recovering the gold in the ore. I tried panning but it was not effective. 
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Last replied to by Ninontrans
Thanks a lot I will check it out 
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Started by WYOMing Prospector
Have read several studies where it is known that citric acid will dissolve 15 of the rare earths into solution.  Question I have is what liquid can I use with the citric acid for solution and then to precipitate them back out what is the best method...
Last replied to by SmartDog
The normal (if there is such a thing with rare earths) is to use gravity and flotation to produce a concentrate, then use a multi stage leaching process to separate the RE's.  The leaching stage is t...
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Started by ManUtd67
Hi, I am looking for operating experiences for controlling and minimizing copper loading on activated carbon in a gold CIP circuit. The project under consideration is still in design phase.  The ore has some copper associated with chalcopyrite whi...
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Last replied to by Reactor
Hello, If you are still in design mode we may be able to help. We have many years of success with in-solution metals and cyanide recovery using membranes. Regards, Bill
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Started by AJ
Good Morning all, Using a Zadra elution circuit at what temperature does a cold strip become a hot strip and what are the essential differences between the two.
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Last replied to by Todd H
130 degrees C is typical for normal stripping - anything below boiling would be considered a cold strip per se.  This comes down to atmospheric stripping vs pressure stripping really not temperature....
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Started by graeme23miller
I am trying to source data on the conductivity of copper electrowinning electrolytes: Cu 30 - 50 g/L, H2SO4 150 - 180 g/L & 50 Celsius.
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Last replied to by Todd H
Why?  The baseline EW parameters apply to almost all copper solutions unless there is significant iron or other impurities in it. https://pubs.acs.org/doi/pdf/10.1021/je8001255 https://www.nrcresea...
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Started by ManUtd67
Considering a gold processing plant that is processing ore that contains some copper (chalcopyrite).  Copper in the ore is around 300-1000ppm. The flowsheet includes a gravity circuit and so expect the gravity concentrate to also contain elevated c...
Last replied to by Gene Cheeseman
Luckily, chalcopyrite is not very soluble in cyanide and its relatively low SG means it won't be in very high concentrations in the gravity concentrate.   It's the other copper minerals you need to...

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