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890
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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...
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...
1
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855
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...
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...
4
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1179
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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
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...
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...
3
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899
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?
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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860
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1
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946
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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...
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...
Last replied to by rob riggir
Best to talk to Mixtec in Perth. They have done good work for me in the past. Cheers
Best to talk to Mixtec in Perth. They have done good work for me in the past. Cheers
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916
VIEWS
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...
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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1091
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2
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1605
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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...
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...
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
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
6
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1501
VIEWS
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 ...
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 ...
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 ...
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 ...
2
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1072
VIEWS
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...
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...
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.
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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1399
VIEWS
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...
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...
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1202
VIEWS
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...
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...
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...
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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1267
VIEWS
Started by Dossa
How can i recover gold from refractory gold ore having high content of sulfur by chemical treatment?
How can i recover gold from refractory gold ore having high content of sulfur by chemical treatment?
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...
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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1234
VIEWS
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.
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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1073
VIEWS
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...
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...
3
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1293
VIEWS
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...
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 Mike
Sodium hydroxide and or lime
Sodium hydroxide and or lime
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1527
VIEWS
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...
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...
1
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1076
VIEWS
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
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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1153
VIEWS
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 ...
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 ...
4
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1426
VIEWS
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.
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.
Last replied to by Ninontrans
Thanks a lot I will check it out
Thanks a lot I will check it out
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1314
VIEWS
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...
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 Mike
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...
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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1326
VIEWS
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...
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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1453
VIEWS
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.
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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1039
VIEWS
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.
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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1264
VIEWS
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...
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...
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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1401
VIEWS
Started by Wadzanayi
Hello Process Engineers In a CIL circuit, does pre-aration to increase DO levels, always result in the benefits of reduced cyanide consumption improved gold recovery
Hello Process Engineers In a CIL circuit, does pre-aration to increase DO levels, always result in the benefits of reduced cyanide consumption improved gold recovery
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1213
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Started by Wadzanayi
I hope that I find you well. I would like to know the differences in performance if any, between Norit and Coconut based hydrocarb activated carbon for adsorption in a CIL circuit. The major issue is the difference in the cost between the t...
I hope that I find you well. I would like to know the differences in performance if any, between Norit and Coconut based hydrocarb activated carbon for adsorption in a CIL circuit. The major issue is the difference in the cost between the t...
Last replied to by Mike
Every operation is different and no general answer will be always correct. The only way to know for sure is to do lab testing or even pilot testing.
Every operation is different and no general answer will be always correct. The only way to know for sure is to do lab testing or even pilot testing.
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1390
VIEWS
Started by JPExit
Would there be a significant difference in Carbon Activity results if I use a Hot Plate rather than an Oven to dry carbon samples prior to Carbon Activity Determination Test?
Would there be a significant difference in Carbon Activity results if I use a Hot Plate rather than an Oven to dry carbon samples prior to Carbon Activity Determination Test?
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1289
VIEWS
Started by CA
Hello. We operate a small scale leach plant in a region where it is difficult to find hydrated lime for us in pH control. We tend to only have access to a milled lime ore (artisinal) that comes from local sources. We are dealing with a very acidi...
Hello. We operate a small scale leach plant in a region where it is difficult to find hydrated lime for us in pH control. We tend to only have access to a milled lime ore (artisinal) that comes from local sources. We are dealing with a very acidi...
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1220
VIEWS
Started by Praymore
What is the best mesh size of activated carbon to use for gold adsorption in a CIL/CIP circuit comparing 6*12 and 8*16 Carbon? Does the mesh size affect the desorption rate of gold?
What is the best mesh size of activated carbon to use for gold adsorption in a CIL/CIP circuit comparing 6*12 and 8*16 Carbon? Does the mesh size affect the desorption rate of gold?
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Would getting all metals into solution and then selectively recovering the PGMs and Au and leave the REEs in the solution be an option?