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4
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2801
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Started by kahonde
hello i have been trying to vat leach a sulfidic gold ore using cyanide at 0.2% and a pH of 10.5-11 but gold of about 3g/t is still reporting in tails after 40 hours of leaching from a head of 5.88 g/t. HELP...vat leaching is the only method i can us...
hello i have been trying to vat leach a sulfidic gold ore using cyanide at 0.2% and a pH of 10.5-11 but gold of about 3g/t is still reporting in tails after 40 hours of leaching from a head of 5.88 g/t. HELP...vat leaching is the only method i can us...
6
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3965
VIEWS
Started by evakahwili
Hello friends, Can someone please help me with the reason why leach solution turned blue in a vat leach tank and the possible solutions to it.
Hello friends, Can someone please help me with the reason why leach solution turned blue in a vat leach tank and the possible solutions to it.
Last replied to by Launcher27
This deep blue was coming from my tank with a heavy blue foam weakening the cynide.
This deep blue was coming from my tank with a heavy blue foam weakening the cynide.
7
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2508
VIEWS
Started by mashudu
our final gold bullion contains about 19% of copper whist gold fines is 65%. i would like to ask as to what flux composition can we use to reduce such high copper in the final bullion .
our final gold bullion contains about 19% of copper whist gold fines is 65%. i would like to ask as to what flux composition can we use to reduce such high copper in the final bullion .
Last replied to by Paul Morrow
https://www.911metallurgist.com/effect-base-metals-gold-bullion-assaying/#How_does_Copper_Affect_Gold_Assays
https://www.911metallurgist.com/effect-base-metals-gold-bullion-assaying/#How_does_Copper_Affect_Gold_Assays
2
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1464
VIEWS
Started by Louise
I just want to ask on how to calculate the harvest time of carbon in cyanide leaching. Its the time that the carbon will reach 1500 grams/tonne? The carbon loading is linear. Thank you for answering 🙂
I just want to ask on how to calculate the harvest time of carbon in cyanide leaching. Its the time that the carbon will reach 1500 grams/tonne? The carbon loading is linear. Thank you for answering 🙂
3
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3582
VIEWS
Started by Mahmoud Abdelmonem
Hello I have never work in gold processing. I'm trying to understand how the circuit of the CIL process goes and the flow of ore and cyanide and carbon in it , but still somethings confused in tank design. Suppose there are 4 tanks . The ore ent...
Hello I have never work in gold processing. I'm trying to understand how the circuit of the CIL process goes and the flow of ore and cyanide and carbon in it , but still somethings confused in tank design. Suppose there are 4 tanks . The ore ent...
Last replied to by Ashraf Ali
Dear mr Mohamed I have same project and I face some problem , can we discus this issue if you want can chat WhatsApp 00966535646526
Dear mr Mohamed I have same project and I face some problem , can we discus this issue if you want can chat WhatsApp 00966535646526
1
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2050
VIEWS
Started by Mikhail
Hello colleagues!Anyone can suggest a method of laboratory research of ores before heap leaching? I am interested in the method of determining the height of the heap. I saw a device that allows you to simulate a column of ore height of 9-12 meters. S...
Hello colleagues!Anyone can suggest a method of laboratory research of ores before heap leaching? I am interested in the method of determining the height of the heap. I saw a device that allows you to simulate a column of ore height of 9-12 meters. S...
4
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2330
VIEWS
Started by ramine
hello i working in Crud Recovery in copper SX (solvent extraction) i separate the organic phase by bentonite clay then organic phase separated from crud ... i can load this organic to system ?
hello i working in Crud Recovery in copper SX (solvent extraction) i separate the organic phase by bentonite clay then organic phase separated from crud ... i can load this organic to system ?
Last replied to by Farhad Baghery
Hi Kevin, Could you please explain your calculation? how many clays for how much organic?
Hi Kevin, Could you please explain your calculation? how many clays for how much organic?
0
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2
VIEWS
Started by Charlie
We have a heap that we are planning to leach. The heap contains silver bearing ore. The pH of the heap is at pH 3. we want to raise the pH to 11 before we start to add cyanide to leach the silver. What is the best possible chemical to use?
We have a heap that we are planning to leach. The heap contains silver bearing ore. The pH of the heap is at pH 3. we want to raise the pH to 11 before we start to add cyanide to leach the silver. What is the best possible chemical to use?
2
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3299
VIEWS
Started by Irene Ibz
Hello, apart from arranging regular screen maintenance, how can I check for interstage screen leakage manually during the shift?
Hello, apart from arranging regular screen maintenance, how can I check for interstage screen leakage manually during the shift?
6
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2045
VIEWS
Started by Rob.Earth.20
Can I make a Copper Sulfate solution with this unknown copper ore and sulfuric acid without using a burner or roasting? How? Can I just using a crushing and just directly dissolving the copper using the sulfuric acid? Thanks
Can I make a Copper Sulfate solution with this unknown copper ore and sulfuric acid without using a burner or roasting? How? Can I just using a crushing and just directly dissolving the copper using the sulfuric acid? Thanks
5
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1797
VIEWS
Started by Wadzanayi
I would like to know how I can modify the cyanidation process to leach a gold ore which has got the following characteristics: Au grade 3-4 g/t Hg grade 1-2.5 g/t Cu, As,Sb grades: trace FeS: trace The ore has produced unsatisfactory r...
I would like to know how I can modify the cyanidation process to leach a gold ore which has got the following characteristics: Au grade 3-4 g/t Hg grade 1-2.5 g/t Cu, As,Sb grades: trace FeS: trace The ore has produced unsatisfactory r...
Last replied to by Auexplorer
I am curious, Please excuse my question, Why the amalgamation circuit when grinding to 75 micron, seems like an extra circuit. Any free_mill material would be caught in the grinding and classification...
I am curious, Please excuse my question, Why the amalgamation circuit when grinding to 75 micron, seems like an extra circuit. Any free_mill material would be caught in the grinding and classification...
1
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1891
VIEWS
Started by Colin
We are in the process of building a VAT Leaching plant and I have just received the 32 element test from SGS with a breakdown of the elements. The As and S content look a little high so I was wondering if I need to pre treat the tailings before loadi...
We are in the process of building a VAT Leaching plant and I have just received the 32 element test from SGS with a breakdown of the elements. The As and S content look a little high so I was wondering if I need to pre treat the tailings before loadi...
Last replied to by David
Colin, the 0.7% Arsenic you have may be enough of a leachability roadblock but it does not confirm it 'the problem'. The Influence of Arsenic in the Cyanidation of Gold Ores is explained by W. B. B...
Colin, the 0.7% Arsenic you have may be enough of a leachability roadblock but it does not confirm it 'the problem'. The Influence of Arsenic in the Cyanidation of Gold Ores is explained by W. B. B...
3
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2355
VIEWS
Started by Parmanand
I want to recover gold and iridium from element with below combination. CU - 63% Ir - 17.61% Ag - 16.20% Au - 3.04% Nickel - 0.13% Mercury (Hg) - 0.002%
I want to recover gold and iridium from element with below combination. CU - 63% Ir - 17.61% Ag - 16.20% Au - 3.04% Nickel - 0.13% Mercury (Hg) - 0.002%
1
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2122
VIEWS
Started by Ozgun
In HPAL (High Pressure Acid Leaching) of nickel, pressure leaching is used to be done in pachuka tanks but it has become obsolete and instead of pachuka tanks, titanium lined autoclaves are being used. From a technical point of view how can tit...
In HPAL (High Pressure Acid Leaching) of nickel, pressure leaching is used to be done in pachuka tanks but it has become obsolete and instead of pachuka tanks, titanium lined autoclaves are being used. From a technical point of view how can tit...
1
REPLY
1537
VIEWS
Started by vekian
I have years of hands-on experience on various CIL/CIP plants but the one I am currently at have an almost manual process of when a carbon pull has finished from the 1st carbon tank (usually about midnight), to straight away transfer carbon from the ...
I have years of hands-on experience on various CIL/CIP plants but the one I am currently at have an almost manual process of when a carbon pull has finished from the 1st carbon tank (usually about midnight), to straight away transfer carbon from the ...
4
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1758
VIEWS
Started by Irene Ibz
hello, In our plant there are carbon which were dumped back then, they are known as reject carbon. These reject carbon consist of grits. In order to save the cost we have decided to reuse these carbon in which their activity is about 12% and they ha...
hello, In our plant there are carbon which were dumped back then, they are known as reject carbon. These reject carbon consist of grits. In order to save the cost we have decided to reuse these carbon in which their activity is about 12% and they ha...
Last replied to by Vault Dweller
Another option for separation could be; if you already have a Gemini or Wilfley table set up, or access to one, you could possibly split the carbon out. Or if you could rig an old cyclone up with the...
Another option for separation could be; if you already have a Gemini or Wilfley table set up, or access to one, you could possibly split the carbon out. Or if you could rig an old cyclone up with the...
1
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1761
VIEWS
Started by Irene Ibz
hello, I have been given a project on carbon inventory and carbon activity improvement. Currently in our plant we are getting a huge change in carbon inventory in CIL circuit during opening and closing stock. Also the activity of carbon is lowering....
hello, I have been given a project on carbon inventory and carbon activity improvement. Currently in our plant we are getting a huge change in carbon inventory in CIL circuit during opening and closing stock. Also the activity of carbon is lowering....
2
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1810
VIEWS
Started by Jaime Jacob
Hi my name is Jaime I'm trying to Learn modelling. I would like to model the moving the solution leach in heap leaching and may be the metal extraction. I have seen many of this studies of modelling in differente journals but only show some equatio...
Hi my name is Jaime I'm trying to Learn modelling. I would like to model the moving the solution leach in heap leaching and may be the metal extraction. I have seen many of this studies of modelling in differente journals but only show some equatio...
Last commented on by David
READ https://www.911metallurgist.com/blog/heap-leaching and its +200 pages of PDF.
READ https://www.911metallurgist.com/blog/heap-leaching and its +200 pages of PDF.
3
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2596
VIEWS
Started by girishchandra
Need help for recovery of copper from copper nitrate solution
Need help for recovery of copper from copper nitrate solution
1
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1313
VIEWS
Started by kahonde
hello i'm using vat leaching but im having a problem with the carbon absorptivity, usually we would get 1 kg recovery but these days we are only achieving atleast 500g. i have tried to use surf in hope to get some improvement, i'm yet to check the r...
hello i'm using vat leaching but im having a problem with the carbon absorptivity, usually we would get 1 kg recovery but these days we are only achieving atleast 500g. i have tried to use surf in hope to get some improvement, i'm yet to check the r...
3
REPLIES
2400
VIEWS
Started by Dan88
Good day, I am trying to figure out the optimal flow rate for a large tank. I am used to 30 ton VAT tanks but have since started using a 150 ton VAT tank. I know that with a 30 ton tank the flow rate is around 5 l/min but if i use the same flow rat...
Good day, I am trying to figure out the optimal flow rate for a large tank. I am used to 30 ton VAT tanks but have since started using a 150 ton VAT tank. I know that with a 30 ton tank the flow rate is around 5 l/min but if i use the same flow rat...
Last replied to by kahonde
0.1% is the ideal but if you leaching high grade ores you might need to use 0.18-0.2%
0.1% is the ideal but if you leaching high grade ores you might need to use 0.18-0.2%
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1397
VIEWS
Started by Biglizer
Hello everyone Is vat leaching the best method to extract high grade gold with coarser particle, if not why? What is the best method of extraction besides mercury amalgamation Thanks
Hello everyone Is vat leaching the best method to extract high grade gold with coarser particle, if not why? What is the best method of extraction besides mercury amalgamation Thanks
Last replied to by max skinner
You will need to get the course gold out first, like anything larger than about 100 mesh. Course gold just doe's not leach well, very slow. As ace says above you can use Knelson or Falcon concentrator...
You will need to get the course gold out first, like anything larger than about 100 mesh. Course gold just doe's not leach well, very slow. As ace says above you can use Knelson or Falcon concentrator...
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1465
VIEWS
Started by Adelnini
Clay from ROM is 10%, and it contains 0.05% copper.. What should we do to clay before feeding to SABC? Can we still recover Cu from clay?
Clay from ROM is 10%, and it contains 0.05% copper.. What should we do to clay before feeding to SABC? Can we still recover Cu from clay?
Last replied to by
0.05% copper = What does it matter THAT IS NOT ORE. On an industrial scale, clay is there to stay. 10% is bad news. What are you doing: Leaching gold or floating copper/copper-gold? Can you clarify......
0.05% copper = What does it matter THAT IS NOT ORE. On an industrial scale, clay is there to stay. 10% is bad news. What are you doing: Leaching gold or floating copper/copper-gold? Can you clarify......
1
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1772
VIEWS
Started by kenyaAurefiner
USING ACTIVATED CARBON: Hello there... Could someone help me with info about using activated carbon in heap leaching method. We have acquired goldix 570 and realized the recommended method by using activated carbon. Considering we have never used it ...
USING ACTIVATED CARBON: Hello there... Could someone help me with info about using activated carbon in heap leaching method. We have acquired goldix 570 and realized the recommended method by using activated carbon. Considering we have never used it ...
3
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5153
VIEWS
Started by Handerson
Gold Dressing Agent (GDA) product that has Chinese origin, meets environmental requirements and reduces the leaching time and energy costs and effluent treatment.Do you know any application on a large scale? I'm the product for testing, I know some s...
Gold Dressing Agent (GDA) product that has Chinese origin, meets environmental requirements and reduces the leaching time and energy costs and effluent treatment.Do you know any application on a large scale? I'm the product for testing, I know some s...
5
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3039
VIEWS
Started by nurdyme
A mine is planning on increasing the leaching density from 40% solids to around 50% solids, with the aim of increasing the dissolution rates, although right now they are working at recoveries of 85%. what would be the effect on the kinetics of diss...
A mine is planning on increasing the leaching density from 40% solids to around 50% solids, with the aim of increasing the dissolution rates, although right now they are working at recoveries of 85%. what would be the effect on the kinetics of diss...
1
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2750
VIEWS
Started by ChemEngStudent
It will be much appreciated if i can get good articles or information about bioleaching of gold and how it differs from more traditional methods. Thanks
It will be much appreciated if i can get good articles or information about bioleaching of gold and how it differs from more traditional methods. Thanks
Last replied to by
Gold extractability was measured by cyanide leaching in the same manner before and after biooxidation. Small samples of ground ore from shake flask experiments were leached by slurrying samples of t...
Gold extractability was measured by cyanide leaching in the same manner before and after biooxidation. Small samples of ground ore from shake flask experiments were leached by slurrying samples of t...
3
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2090
VIEWS
Started by firebird
Hi everyone. I am now engaged in a CIL circuit. I tried to calculate my final gold bullion recovery after smelting but I cant. The problem is I had a total of 76kg gold fed to the grinding for 11 days.in the final circuit of the CIL a total of 4kg of...
Hi everyone. I am now engaged in a CIL circuit. I tried to calculate my final gold bullion recovery after smelting but I cant. The problem is I had a total of 76kg gold fed to the grinding for 11 days.in the final circuit of the CIL a total of 4kg of...
Last replied to by Greg Henderson
Reconciling feed gold with back-calculated gold based on change in inventory + dore gold + tails gold can be tricky as sampling of feed in a representatives manner is notoriously difficult, especiall...
Reconciling feed gold with back-calculated gold based on change in inventory + dore gold + tails gold can be tricky as sampling of feed in a representatives manner is notoriously difficult, especiall...
4
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2091
VIEWS
Started by Wadzanayi
The unit operation consists of vat leaching of stamp mill dumps.The dump is created after artisanal miners surrounding the custom milling center have taken out their gravity gold. Sequence of events is as follows; Site began experiencing high sol...
The unit operation consists of vat leaching of stamp mill dumps.The dump is created after artisanal miners surrounding the custom milling center have taken out their gravity gold. Sequence of events is as follows; Site began experiencing high sol...
3
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1946
VIEWS
Started by Nyasha Jawanda
hi guys what are factors that affect gold adsorption onto carbon in carbon in solution process.
hi guys what are factors that affect gold adsorption onto carbon in carbon in solution process.
Last replied to by
Activated carbon is used to recover gold from cyanide leach solutions, owing to its large surface area. There are 3 major mechanisms controlling the rate of gold adsorption onto activated carbon: 1...
Activated carbon is used to recover gold from cyanide leach solutions, owing to its large surface area. There are 3 major mechanisms controlling the rate of gold adsorption onto activated carbon: 1...
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1394
VIEWS
Started by m16 mine
Is there anyway you can test presence of Gold in cyanide solution using handheld electronic instruments without the use of test tubes and chemicals.
Is there anyway you can test presence of Gold in cyanide solution using handheld electronic instruments without the use of test tubes and chemicals.
Last replied to by ThabisoKwenane
Yes. You can try using ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometry)
Yes. You can try using ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometry)
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1897
VIEWS
Started by Dane Smith
I have a leach feed thickener with a serious over-flocculation issue. Has anyone seen any papers/ data on the effect of synthetic flocculants on cyanide/ gold leach reactions? I know enough about the flocculant/ particle bond to know there will alway...
I have a leach feed thickener with a serious over-flocculation issue. Has anyone seen any papers/ data on the effect of synthetic flocculants on cyanide/ gold leach reactions? I know enough about the flocculant/ particle bond to know there will alway...
Last replied to by David
Hi Dane, I looked in http://www.onemine.org/ and found nothing specific to the effect of flocculant on leaching rates. I just know that too much is bad... Here is what Marsden says.
Hi Dane, I looked in http://www.onemine.org/ and found nothing specific to the effect of flocculant on leaching rates. I just know that too much is bad... Here is what Marsden says.
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Max, Hello. I hope you can help. Ok assay's and lab yes gold arsenic and gold locked in sulfides with micro. I have tried roast and smelt, nope a matte. Lab said a assay flux with lead, it worked but ...