- To participate in the 911Metallurgist Forums, be sure to JOIN & LOGIN
- Use Add New Topic to ask a New Question/Discussion about Pyrometallurgy and Electrometallurgy.
- 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.
2
REPLIES
9340
VIEWS
Started by Reidy
Hi, has anybody melted gold concentrate and poured it without using any flux's? Our goal isn't to refine the gold as the mint does that anyway and the cost will be the same. We have low iron and lead levels and I was just curious of anybody having ...
Hi, has anybody melted gold concentrate and poured it without using any flux's? Our goal isn't to refine the gold as the mint does that anyway and the cost will be the same. We have low iron and lead levels and I was just curious of anybody having ...
6
REPLIES
5498
VIEWS
Started by Colin
Can someone explain the process of extracting gold once you have obtained a concentrate after putting your alluvial material through a gravity machine. We put about 200kg of soil through a gravity machine and ended up with about 2kg of concentrate. W...
Can someone explain the process of extracting gold once you have obtained a concentrate after putting your alluvial material through a gravity machine. We put about 200kg of soil through a gravity machine and ended up with about 2kg of concentrate. W...
Last replied to by solarsmith
if you want to get every thing out of it look up tcb in AZ for a concentrate refiner. and then make lots more. I am thinking of starting a gold ore concentrate coop here in Colorado to help all...
if you want to get every thing out of it look up tcb in AZ for a concentrate refiner. and then make lots more. I am thinking of starting a gold ore concentrate coop here in Colorado to help all...
3
REPLIES
4354
VIEWS
Started by Roselyn Yeboah
Please can someone help me with ways to ash gold activated carbon followed by smelting! . I tried ashing 300g using a pot on a gas cooker but we couldn't get the carbon to burn so we tried smelting the granule with borax and salt peter as flux. The s...
Please can someone help me with ways to ash gold activated carbon followed by smelting! . I tried ashing 300g using a pot on a gas cooker but we couldn't get the carbon to burn so we tried smelting the granule with borax and salt peter as flux. The s...
Last commented on by Roselyn Yeboah
Thanks
Thanks
7
REPLIES
2195
VIEWS
Started by jovanifirebird
hi guys. my question is a small scale process. we desorb gold-cyanide (AuCN)) from a carbon. i am currently trying to decompose gold from cyanide in a 1M of NaOH solution. i use stainless steel as a cathode. battery as a power supply. however the pro...
hi guys. my question is a small scale process. we desorb gold-cyanide (AuCN)) from a carbon. i am currently trying to decompose gold from cyanide in a 1M of NaOH solution. i use stainless steel as a cathode. battery as a power supply. however the pro...
4
REPLIES
4777
VIEWS
Started by Ahmed Zaky
Hello i want to ask about the efficiency of gold recovery from ash of activated carbon by aqua regia (active carbon loaded with gold from cyanide leaching ) where this ash contains average gold 15 gram per kilo ash thank you
Hello i want to ask about the efficiency of gold recovery from ash of activated carbon by aqua regia (active carbon loaded with gold from cyanide leaching ) where this ash contains average gold 15 gram per kilo ash thank you
1
REPLY
1213
VIEWS
Started by Rudi
Good day fellow mets, Our group is in the process of building a pilot circuit to optimize methods of upgrading a tropical nickel laterite ore using mechanical means (combination of crushing/scrubbing/screening/classification/attritioning) similar to...
Good day fellow mets, Our group is in the process of building a pilot circuit to optimize methods of upgrading a tropical nickel laterite ore using mechanical means (combination of crushing/scrubbing/screening/classification/attritioning) similar to...
Last replied to by Sandeep Bisht
You mean like this? https://www.911metallurgist.com/blog/crushing-grinding-wet-ores
You mean like this? https://www.911metallurgist.com/blog/crushing-grinding-wet-ores
3
REPLIES
1416
VIEWS
Started by max skinner
I am running some test using a lab size EMEW cell. I am told to use a certain current density, how do I calculate that? The cathode is 1.5 " diameter by 16" long stainless steel and the anode is 5/8 " diameter by 16 " long titanium.
I am running some test using a lab size EMEW cell. I am told to use a certain current density, how do I calculate that? The cathode is 1.5 " diameter by 16" long stainless steel and the anode is 5/8 " diameter by 16 " long titanium.
3
REPLIES
1558
VIEWS
Started by FTM89
Hi, I`m working on a gold plant as a consultant. I find out that they are using caustic after the elution. For what purpose will they use caustic after the elution? What was explained to me was that it`s for conductivity. What will be a good number i...
Hi, I`m working on a gold plant as a consultant. I find out that they are using caustic after the elution. For what purpose will they use caustic after the elution? What was explained to me was that it`s for conductivity. What will be a good number i...
Last replied to by David
My friend says his references indicate that cells are operated with electrolyte conductivity in the order of 2 S/m. This is critical if gold is to be deposited efficiently
My friend says his references indicate that cells are operated with electrolyte conductivity in the order of 2 S/m. This is critical if gold is to be deposited efficiently
2
REPLIES
2000
VIEWS
Started by geff
why to load carbon with gold and after strip off gold from carbon by electrolysis. is there any research to bypass the carbon loading and directly use the pregnant water as an electrolyte to recover gold ?
why to load carbon with gold and after strip off gold from carbon by electrolysis. is there any research to bypass the carbon loading and directly use the pregnant water as an electrolyte to recover gold ?
Last replied to by Mikhail
In order to send a solution with gold for electrolysis, the concentration of gold should be at least 20 mg / l. Otherwise, the electrolysis process is not justified.This method is implemented in insta...
In order to send a solution with gold for electrolysis, the concentration of gold should be at least 20 mg / l. Otherwise, the electrolysis process is not justified.This method is implemented in insta...
1
REPLY
1600
VIEWS
Started by biteyaboy
I have cathode mesh which i am going to wash by pressure water and filter solid residues for smelting, also to wash remaining in Wire mesh by nitric acid dry them ready for smelting. During smelting what required reagents are needed and in what quan...
I have cathode mesh which i am going to wash by pressure water and filter solid residues for smelting, also to wash remaining in Wire mesh by nitric acid dry them ready for smelting. During smelting what required reagents are needed and in what quan...
Last replied to by David
Hi Biteyaboy, Be sure to review https://www.911metallurgist.com/blog/gold-smelting-refining-process
Hi Biteyaboy, Be sure to review https://www.911metallurgist.com/blog/gold-smelting-refining-process
Gold Refinery Procedureshttps://www.911metallurgist.com/gold-silver-refine...
11
REPLIES
1589
VIEWS
Started by Alex Loutou
Currently our Merril Crowe running with 2.5 ppm Au, 5 ppm Ag, zinc consumption 5kg/hrs (more than 20x stoichiometry) and 100 ppm PbNO3. So the base metal content in dore consist of 17% zn, 8% Pb and less Cu, Fe. Smelting ratio 1:1 cake: flux (15% sil...
Currently our Merril Crowe running with 2.5 ppm Au, 5 ppm Ag, zinc consumption 5kg/hrs (more than 20x stoichiometry) and 100 ppm PbNO3. So the base metal content in dore consist of 17% zn, 8% Pb and less Cu, Fe. Smelting ratio 1:1 cake: flux (15% sil...
Last replied to by David
I just uploaded this long and extensive history paper. I think it would help you. It reviews an example goldroom refining practices https://www.911metallurgist.com/gold-refinery/ https://www.911metal...
I just uploaded this long and extensive history paper. I think it would help you. It reviews an example goldroom refining practices https://www.911metallurgist.com/gold-refinery/ https://www.911metal...
2
REPLIES
1323
VIEWS
Started by hulk
I need to use my eluate after elution more than once, currently I drain this solution because I think that it is dirty and I prepare another one for the next elution;what parameters of this eluate should i check before use it for a second or third e...
I need to use my eluate after elution more than once, currently I drain this solution because I think that it is dirty and I prepare another one for the next elution;what parameters of this eluate should i check before use it for a second or third e...
4
REPLIES
1159
VIEWS
Started by hulk
During gold elution, a calcium deposit is formed on the plate exchanger surfaces, we perform shutdowns to clean them, can we clean effectively without Disassemble the plates, which cleaner should i use and at which concentration and which depth?
During gold elution, a calcium deposit is formed on the plate exchanger surfaces, we perform shutdowns to clean them, can we clean effectively without Disassemble the plates, which cleaner should i use and at which concentration and which depth?
2
REPLIES
1679
VIEWS
Started by Japhet
Hi Team, I getting trouble to improve fineness on Dore' as most of the time i am getting more 50%+ Ag, Is there a specific flux recipe or extra additive that has been tested to improve the fineness of the gold bars?
Hi Team, I getting trouble to improve fineness on Dore' as most of the time i am getting more 50%+ Ag, Is there a specific flux recipe or extra additive that has been tested to improve the fineness of the gold bars?
Last commented on by .999
The process David is referring to is called " inquarting " or " quartering." It's when refiners lower the percentage of gold to 25% by the addition of silver or a base metal such as copper. 3 parts si...
The process David is referring to is called " inquarting " or " quartering." It's when refiners lower the percentage of gold to 25% by the addition of silver or a base metal such as copper. 3 parts si...
1
REPLY
1264
VIEWS
Started by hulk
Hello ! In our gold processing plant we pratice the elution of pregnant carbon by the zadra process, We use two columns: one for acid washing and the other for elution, but the filters in the elution column are clogged very often (probably due to ...
Hello ! In our gold processing plant we pratice the elution of pregnant carbon by the zadra process, We use two columns: one for acid washing and the other for elution, but the filters in the elution column are clogged very often (probably due to ...
Last replied to by David
Wash the carbon before elution tower or recirculate elution circuit solution clean screens then start strip.
Wash the carbon before elution tower or recirculate elution circuit solution clean screens then start strip.
1
REPLY
1585
VIEWS
Started by hulk
hi! how to estimate the required amperage for electrowinning cell for gold(zadra elution process).
hi! how to estimate the required amperage for electrowinning cell for gold(zadra elution process).
Last replied to by Mike Rockandel
Current efficiency is very low, maybe 10%. 700 A will plate about 1 kg/h gold.
Current efficiency is very low, maybe 10%. 700 A will plate about 1 kg/h gold.
2
REPLIES
1201
VIEWS
Started by ely.thar
we conducted a bacisity test on the coal fly ash sample resulting to a ph of 12.01, how can we calculate the volume of our lixiviant needed to add in the sample to reach a ph of 0.8? thank you for your replies
we conducted a bacisity test on the coal fly ash sample resulting to a ph of 12.01, how can we calculate the volume of our lixiviant needed to add in the sample to reach a ph of 0.8? thank you for your replies
Last commented on by mikerockandel
Not sure 2stage helps you. But does depend on your objective. Imagine flyash moving left to right and acid solution opposite. 2stage would possibly give you a near neutral aqueous effluent with the f...
Not sure 2stage helps you. But does depend on your objective. Imagine flyash moving left to right and acid solution opposite. 2stage would possibly give you a near neutral aqueous effluent with the f...
3
REPLIES
1319
VIEWS
Started by CA
We've been successfully running a small scale alcohol (isopropyl) zadra stripping process for a while now. We've begun a carbon stripping service for clients and today ran into something we have never seen. During the electrowinning process, a...
We've been successfully running a small scale alcohol (isopropyl) zadra stripping process for a while now. We've begun a carbon stripping service for clients and today ran into something we have never seen. During the electrowinning process, a...
7
REPLIES
3327
VIEWS
Started by Mikhail
I need a method of burning carbon and smelting to extract the gold. Can anyone suggest a method? What are the potential losses of metal can be?
I need a method of burning carbon and smelting to extract the gold. Can anyone suggest a method? What are the potential losses of metal can be?
Last replied to by Mikhail
Hello dear colleagues, thank you for the comments to my question.I'm working on a project to extract gold from the dumps of amalgamation. The technology of heap leaching. Gold-bearing solutions are fe...
Hello dear colleagues, thank you for the comments to my question.I'm working on a project to extract gold from the dumps of amalgamation. The technology of heap leaching. Gold-bearing solutions are fe...
1
REPLY
2264
VIEWS
Started by Amir
I recycle metal (gold. Silver and palladium) from pcb by hydrometallurgy process. Before i dismantled component from pcb with air hummer. But now i decided chemically by organic solution like alkane sulfonic acid and glycol ether sel...
I recycle metal (gold. Silver and palladium) from pcb by hydrometallurgy process. Before i dismantled component from pcb with air hummer. But now i decided chemically by organic solution like alkane sulfonic acid and glycol ether sel...
Last replied to by David
Amir, this may help (not perfectly) ...but have a read to https://www.911metallurgist.com/blog/electrolytic-method-recovery-lead-scrap-batteries page 14 talks on Tin separation of Lead. Fortunately,...
Amir, this may help (not perfectly) ...but have a read to https://www.911metallurgist.com/blog/electrolytic-method-recovery-lead-scrap-batteries page 14 talks on Tin separation of Lead. Fortunately,...
2
REPLIES
1248
VIEWS
Started by ameer
Hi, I faced problem in our pressurise zadra cell. High voltage appeared 12 volt during gold stripping, ampere was set to 660A, flow rate is 11.5 Temperature is 150 C, anyone can help me to solve this problem
Hi, I faced problem in our pressurise zadra cell. High voltage appeared 12 volt during gold stripping, ampere was set to 660A, flow rate is 11.5 Temperature is 150 C, anyone can help me to solve this problem
1
REPLY
1519
VIEWS
6
REPLIES
4495
VIEWS
Started by Charlie
I am having a problem of gold not coming off from the steel knitted mesh in the cathodes in the electro-winning cell. I tried putting the steel knitted mesh in nitric acid before washing it off with a high pressure wap machine but still doesn't co...
I am having a problem of gold not coming off from the steel knitted mesh in the cathodes in the electro-winning cell. I tried putting the steel knitted mesh in nitric acid before washing it off with a high pressure wap machine but still doesn't co...
Last commented on by Subhash-Kumar-Roy
very inexpensive steel wool=mild steel
very inexpensive steel wool=mild steel
11
REPLIES
2738
VIEWS
Started by goldinvestor
Hi, I have been invited to invest in a new gold mine (in Scotland) which has just announced preliminary results from a tailings bulk processing trial and I'm trying to get a rough idea of revenues. The Au grade of the tailings is 8g/t (the mine when ...
Hi, I have been invited to invest in a new gold mine (in Scotland) which has just announced preliminary results from a tailings bulk processing trial and I'm trying to get a rough idea of revenues. The Au grade of the tailings is 8g/t (the mine when ...
Last replied to by max skinner
My suggestion, you need a 34 or 64 element ICP to see what is in the concentrates so you know where you stand. The lead concentrates will be the most difficult to get rid of, there are smelters in Mex...
My suggestion, you need a 34 or 64 element ICP to see what is in the concentrates so you know where you stand. The lead concentrates will be the most difficult to get rid of, there are smelters in Mex...
2
REPLIES
2141
VIEWS
Started by Madungo
Hello, I need help to releasing gold lock up from my CIL circuit's carbon. I want to run more frequent elution in order to get more gold out but we seem to only recover what we're putting in only. My gold locks up in the tanks and it increases each...
Hello, I need help to releasing gold lock up from my CIL circuit's carbon. I want to run more frequent elution in order to get more gold out but we seem to only recover what we're putting in only. My gold locks up in the tanks and it increases each...
4
REPLIES
3325
VIEWS
Started by Panashe
My Company is involved in toll elution using the pressurized Zadra (350-400kg carbon load), we are now considering using an AARL elution for toll carbon desorption as an upgrade from the pressurized Zadra and the Peter Goossen plants are there any po...
My Company is involved in toll elution using the pressurized Zadra (350-400kg carbon load), we are now considering using an AARL elution for toll carbon desorption as an upgrade from the pressurized Zadra and the Peter Goossen plants are there any po...
Last replied to by ThabisoKwenane
For water treatment, you can use cat-ionic resins in columns to soften your water. Use brine (NaCL solution) for flushing into your water softener plant. The ultimatum goal is to reduce as much calciu...
For water treatment, you can use cat-ionic resins in columns to soften your water. Use brine (NaCL solution) for flushing into your water softener plant. The ultimatum goal is to reduce as much calciu...
1
REPLY
2112
VIEWS
Started by Omurvama
Hi all! I want to smelt an ore with 4 kg/Ton of silver. I have been reading about the process and there are several kind of fluxes can be used. What could you tell me about it? is enough the silver in ore to think in smelting? is the flux selection ...
Hi all! I want to smelt an ore with 4 kg/Ton of silver. I have been reading about the process and there are several kind of fluxes can be used. What could you tell me about it? is enough the silver in ore to think in smelting? is the flux selection ...
Last replied to by grant.k.harding
Dear Omar, The ore has silver worth about $2,500 per ton, so its not worth direct smelting at that concentration, unless you already have the facilities to smelt it. If that’s the case I would ne...
Dear Omar, The ore has silver worth about $2,500 per ton, so its not worth direct smelting at that concentration, unless you already have the facilities to smelt it. If that’s the case I would ne...
2
REPLIES
1847
VIEWS
Started by girishchandra
I want to know about electrorefining of gold to get higher purity of gold metal. Input of gold would be up to 98% or above . Please help me.
I want to know about electrorefining of gold to get higher purity of gold metal. Input of gold would be up to 98% or above . Please help me.
Last replied to by girishchandra
I am trying to achieve purity of gold about 99.99% Using chlorauric acid for electrorefining.
I am trying to achieve purity of gold about 99.99% Using chlorauric acid for electrorefining.
1
REPLY
1161
VIEWS
Started by CA
We are using the alcohol Zadra method to treat our carbon. However, due to the origin of the ore we are treating, we wind up with leaves, roots, etc. that catch on the carbon screen i.e. Trash in elution column. Separating these plant products f...
We are using the alcohol Zadra method to treat our carbon. However, due to the origin of the ore we are treating, we wind up with leaves, roots, etc. that catch on the carbon screen i.e. Trash in elution column. Separating these plant products f...
Last replied to by
I think you should screen it out from the grinding circuit cyclone overflow. It really is not that hard/complicated. It might cost you $200 to build a trash screen with 1 cm holes in it. https://www....
I think you should screen it out from the grinding circuit cyclone overflow. It really is not that hard/complicated. It might cost you $200 to build a trash screen with 1 cm holes in it. https://www....
1
REPLY
1870
VIEWS
Started by kannan
We are currently trying to remove only iron,zinc and indium in the alloy gold in the melting stage itself , other than copper and silver with gold. The reason for this trials is direct usage of the resulted alloy gold to the further process by adding...
We are currently trying to remove only iron,zinc and indium in the alloy gold in the melting stage itself , other than copper and silver with gold. The reason for this trials is direct usage of the resulted alloy gold to the further process by adding...
Last replied to by Marshal Meru
The metals slag out in the following order, as oxides: zinc, iron, antimony, arsenic, lead, bismuth, nickel, tellurium, copper. In doesn't mention indium, but I would guess it would oxidize, too. Ther...
The metals slag out in the following order, as oxides: zinc, iron, antimony, arsenic, lead, bismuth, nickel, tellurium, copper. In doesn't mention indium, but I would guess it would oxidize, too. Ther...
chapmans flux thinner contains 50/50 Lime/flourspar. Chapmans black flux (not recommended for silver) Borax, soda ash, silica, manganese Chapmans white recommended if silver recovery is desired...