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22
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28919
VIEWS
Started by JohnnyD
Muriatic Acid + Clorox Bleach is dissolving my gold, but Sodium Metabisulfate (stump out) is not dropping the gold back out in pure form it's only changing colors of my solution. no precipitation.
Muriatic Acid + Clorox Bleach is dissolving my gold, but Sodium Metabisulfate (stump out) is not dropping the gold back out in pure form it's only changing colors of my solution. no precipitation.
9
REPLIES
3510
VIEWS
Started by Marshal Meru
I would like to start a new discussion on the treatment of E-waste. The production/consumption of EEEs is ever increasing with the concurrent decrease in their lifespan. How do you see the current status and future of treatment/recovery/recycling of ...
I would like to start a new discussion on the treatment of E-waste. The production/consumption of EEEs is ever increasing with the concurrent decrease in their lifespan. How do you see the current status and future of treatment/recovery/recycling of ...
12
REPLIES
1921
VIEWS
Started by
Hi my zinc sulphate manufacturing process, I am having Zinc dross containing 4% Iron. To make pure Zinc sulphate solution we have to remove Iron. Is there any solvent available to separate Iron from Zinc?
Hi my zinc sulphate manufacturing process, I am having Zinc dross containing 4% Iron. To make pure Zinc sulphate solution we have to remove Iron. Is there any solvent available to separate Iron from Zinc?
7
REPLIES
4291
VIEWS
Started by
Disposal of Spent Activated Carbon: How can I safely dispose spent carbon which has long been used in the elution process and how can I verify if the carbon contains any residual gold?
Disposal of Spent Activated Carbon: How can I safely dispose spent carbon which has long been used in the elution process and how can I verify if the carbon contains any residual gold?
Last replied to by James Nkali
hi,need help please, i have more than 30 tonnes of eluted activated carbon with 50ppm of Gold and 90 ppm of copper, i dont want to use Elution machine because its more expensive, am looking forw...
hi,need help please, i have more than 30 tonnes of eluted activated carbon with 50ppm of Gold and 90 ppm of copper, i dont want to use Elution machine because its more expensive, am looking forw...
11
REPLIES
1792
VIEWS
Started by Paul Morrow
I am looking for this extractant (for the recovery of gallium from sulphuric acid), does anyone know a supplier?I contacted several suppliers, Exxon Mobil Chemicals, Cytec, Daihachi and Solvay-Rhodia, but none seems to have this product in their port...
I am looking for this extractant (for the recovery of gallium from sulphuric acid), does anyone know a supplier?I contacted several suppliers, Exxon Mobil Chemicals, Cytec, Daihachi and Solvay-Rhodia, but none seems to have this product in their port...
Last replied to by David
Try chemnet.com at http://bit.ly/1MFi7kW?
Try chemnet.com at http://bit.ly/1MFi7kW?
7
REPLIES
4105
VIEWS
Started by Bob Mathias
Please advice how can I increase the gold purity during smelting from sulphide ore, fluxes used are Borax (dehydrated), Silica, Soda ash and Potassium Nitrate. It is for smelting of EW sludge and I want to reduce the amount of silver and base metal t...
Please advice how can I increase the gold purity during smelting from sulphide ore, fluxes used are Borax (dehydrated), Silica, Soda ash and Potassium Nitrate. It is for smelting of EW sludge and I want to reduce the amount of silver and base metal t...
14
REPLIES
1686
VIEWS
Started by Subhash-Kumar-Roy
We produce gold and silver bar with Merrill Crowe process. The bar has some lead but we remove this metal with oxy-blower in the refinery. I want to learn, have a different process or idea?
We produce gold and silver bar with Merrill Crowe process. The bar has some lead but we remove this metal with oxy-blower in the refinery. I want to learn, have a different process or idea?
Last replied to by Hauptsturm
Lead is in PLS is unusual as Pb(CN)2 is insoluble, nevertheless you’re not the first in my limited experience.Again the metallurgist has several options; one is to removal prior to the MC Zinc cemen...
Lead is in PLS is unusual as Pb(CN)2 is insoluble, nevertheless you’re not the first in my limited experience.Again the metallurgist has several options; one is to removal prior to the MC Zinc cemen...
2
REPLIES
1333
VIEWS
Started by Paul Morrow
We used to analyse Gold by fire assay finished by AAS or gravimetric but as you know the cost in such techniques is very high and the selection of flux may leads to errors specially in low grade (0,2ppm) analysis in my project I’m working on someth...
We used to analyse Gold by fire assay finished by AAS or gravimetric but as you know the cost in such techniques is very high and the selection of flux may leads to errors specially in low grade (0,2ppm) analysis in my project I’m working on someth...
Last replied to by Paul Morrow
I will contact you but the procedures are they using AA or? Do you understand that the aim is to do it by electrochemical method using one the electrode mentioned earlier, and understand what's beyond...
I will contact you but the procedures are they using AA or? Do you understand that the aim is to do it by electrochemical method using one the electrode mentioned earlier, and understand what's beyond...
5
REPLIES
3255
VIEWS
Started by Zander Barcalow
What’s the difference between organic continuous and aqueous continuous mixing in solvent extraction? And which of them is better?
What’s the difference between organic continuous and aqueous continuous mixing in solvent extraction? And which of them is better?
Last replied to by
Excellent description. I have had very little to do with SX so this was an interesting read. I particularly liked the beer analogy - giving a real world 'visual' example that a lay person can identify...
Excellent description. I have had very little to do with SX so this was an interesting read. I particularly liked the beer analogy - giving a real world 'visual' example that a lay person can identify...
10
REPLIES
1373
VIEWS
Started by
Does anyone know of SX applications in the plating industry? I doubt if it can be used directly on production baths because contamination by organic compounds adversely affects plating.
Does anyone know of SX applications in the plating industry? I doubt if it can be used directly on production baths because contamination by organic compounds adversely affects plating.
Last replied to by
The MECER process recycles 95 % of the etch liquor back to the etching machine. However, I agree that most applications are treating plating solutions without recycle.
The MECER process recycles 95 % of the etch liquor back to the etching machine. However, I agree that most applications are treating plating solutions without recycle.
4
REPLIES
1372
VIEWS
Started by
How do you improve the plant mixer efficiency both in organic and aqueous phase apart from flows, turbine speed? Lab test is more of batch than continuous process and equilibrium is reached/assumed.
How do you improve the plant mixer efficiency both in organic and aqueous phase apart from flows, turbine speed? Lab test is more of batch than continuous process and equilibrium is reached/assumed.
Last replied to by Maya Rothman
I think everyone has given you a good direction. I suggest you also make sure that you are mixing the phases at A/O close to 1 and that you have a residence time of 2-3 minutes in each mixer tank base...
I think everyone has given you a good direction. I suggest you also make sure that you are mixing the phases at A/O close to 1 and that you have a residence time of 2-3 minutes in each mixer tank base...
9
REPLIES
2365
VIEWS
Started by
I would like to have experts’ suggestion about an application of SX in small scale copper elector-refinery (3-5 Kt/Y) and if it is tangible, are there any successful references. Main concept is to refine 97-98% grade copper Anodes to 99.999 pur...
I would like to have experts’ suggestion about an application of SX in small scale copper elector-refinery (3-5 Kt/Y) and if it is tangible, are there any successful references. Main concept is to refine 97-98% grade copper Anodes to 99.999 pur...
Last replied to by
In my opinion there is option of combining electro refining circuit (large) with a small SX-EW as releasing impurities. Everything depends on the level of impurities.I like to solve the technical prob...
In my opinion there is option of combining electro refining circuit (large) with a small SX-EW as releasing impurities. Everything depends on the level of impurities.I like to solve the technical prob...
8
REPLIES
2123
VIEWS
Started by Victor Bergman
The use of microwaves for carbon activation was invented in the 1980's and it earned my privilege to study metallurgy. The issue is that it is cost prohibitive and the name MICRO exactly spells out the problem.It worked fantastic in small laboratory ...
The use of microwaves for carbon activation was invented in the 1980's and it earned my privilege to study metallurgy. The issue is that it is cost prohibitive and the name MICRO exactly spells out the problem.It worked fantastic in small laboratory ...
Last replied to by
I looked at that for floating activated carbon fines (for regeneration) out of filter-cake, without much success. The concept was that activated carbon would absorb the MW energy preferentially over o...
I looked at that for floating activated carbon fines (for regeneration) out of filter-cake, without much success. The concept was that activated carbon would absorb the MW energy preferentially over o...
9
REPLIES
2120
VIEWS
Started by
I need to know what chemical reaction takes place when pyrrhotite is heated in presence of air. It is evident that Fe3O4 and SO2 will be produced but unable to figure out the exact equation.
I need to know what chemical reaction takes place when pyrrhotite is heated in presence of air. It is evident that Fe3O4 and SO2 will be produced but unable to figure out the exact equation.
Last replied to by
Fe (1-x) S as fine powder could react with SO2 gas over 150 centigrade in aerated environment at 0.6 atm. Try on dryer plate
Fe (1-x) S as fine powder could react with SO2 gas over 150 centigrade in aerated environment at 0.6 atm. Try on dryer plate
1
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1351
VIEWS
Started by Jean Rasczak
In Sizing a CoSO4 mixing system for a Cu EW plant. This system must be sufficiently robust to source CoSO4 from different suppliers so anhydrous to heptahydrate products and up to very coarse particle size
In Sizing a CoSO4 mixing system for a Cu EW plant. This system must be sufficiently robust to source CoSO4 from different suppliers so anhydrous to heptahydrate products and up to very coarse particle size
Last replied to by Zander Barcalow
http://www.trentu.ca/chemistry/chem321h/labmanual.pdfhttps://www.ec.gc.ca/ese-ees/8E18277B-457E-4073-8F27-EF5878648820/batch10_4substances(1)_en.pdf
http://www.trentu.ca/chemistry/chem321h/labmanual.pdfhttps://www.ec.gc.ca/ese-ees/8E18277B-457E-4073-8F27-EF5878648820/batch10_4substances(1)_en.pdf
5
REPLIES
2648
VIEWS
Started by mine master
Hi, everybodyI want to separate an alloy of gold and silver with gold content between 25% and 92% Au.As you know, in the alloy of gold and silver with gold content of less than 25%, Ag can be dissolved with sulfuric Acid or Nitric Acid.In the alloy o...
Hi, everybodyI want to separate an alloy of gold and silver with gold content between 25% and 92% Au.As you know, in the alloy of gold and silver with gold content of less than 25%, Ag can be dissolved with sulfuric Acid or Nitric Acid.In the alloy o...
Last replied to by David
The Miller process consists of injecting chlorine into the charge through a clay tube connected to silver tubing that is connected to the chlorine source. About 0.2 kg (0.5 Ib) of borax glass is sp...
The Miller process consists of injecting chlorine into the charge through a clay tube connected to silver tubing that is connected to the chlorine source. About 0.2 kg (0.5 Ib) of borax glass is sp...
8
REPLIES
1480
VIEWS
Started by Zander Barcalow
I am doing a project and I need to quantify the change in reaction rate of iron reduction to the change in surface area of iron ore lump. What is the effect and impact of surface area of iron ore lumps on the kinetics of blast furnace? Is there any m...
I am doing a project and I need to quantify the change in reaction rate of iron reduction to the change in surface area of iron ore lump. What is the effect and impact of surface area of iron ore lumps on the kinetics of blast furnace? Is there any m...
Last replied to by
Have you looked at any of the shrinking core models? There's different equations based on the rate controlling steps: diffusion, ash layer and chemically rate control. You might find this article usef...
Have you looked at any of the shrinking core models? There's different equations based on the rate controlling steps: diffusion, ash layer and chemically rate control. You might find this article usef...
0
REPLIES
7733
VIEWS
Started by David
Here are a few PDFs on Electronic Scrap Recycling I found for you.http://911Metallurgist.com/C/ElectronicScrapRecycling/Refining-Precious-Metal-Wastes-C-M-Hoke.pdfhttp://911Metallurgist.com/C/ElectronicScrapRecycling/Metal-Recovery.pdfhttp://911Meta...
Here are a few PDFs on Electronic Scrap Recycling I found for you.http://911Metallurgist.com/C/ElectronicScrapRecycling/Refining-Precious-Metal-Wastes-C-M-Hoke.pdfhttp://911Metallurgist.com/C/ElectronicScrapRecycling/Metal-Recovery.pdfhttp://911Meta...
6
REPLIES
2028
VIEWS
Started by Maya Rothman
I need to know the correct dosage addition of zinc (Kg Zn / ppm Ag) to have a better precipitation of silver?
I need to know the correct dosage addition of zinc (Kg Zn / ppm Ag) to have a better precipitation of silver?
Last replied to by Helena Russell
Please, do not forget mercury , because is another element that precipitates with zinc addition.Another issue , higher grade Au and Ag lower ratio Zn / (Au + Ag). Keep in mind Pourbaix's diagram and t...
Please, do not forget mercury , because is another element that precipitates with zinc addition.Another issue , higher grade Au and Ag lower ratio Zn / (Au + Ag). Keep in mind Pourbaix's diagram and t...
5
REPLIES
2349
VIEWS
Started by
I need your help finding another Gold Smelting Method is known to melt gold concentrate, I use caustic soda and borax.
I need your help finding another Gold Smelting Method is known to melt gold concentrate, I use caustic soda and borax.
Last replied to by
It`s really helpful, got it and for me now is like a boy with a new toy, appreciate it!
It`s really helpful, got it and for me now is like a boy with a new toy, appreciate it!
2
REPLIES
2013
VIEWS
Started by JohnnyD
I am interested in finding some anecdotal evidence of electrowinning cell fires and what caused it.Has anybody come across some and where did it occur?
I am interested in finding some anecdotal evidence of electrowinning cell fires and what caused it.Has anybody come across some and where did it occur?
Last commented on by Victor Bergman
Not directly, no.
Not directly, no.
8
REPLIES
6108
VIEWS
Started by Helena Russell
I am currently separating and extracting gold from margin ore dump (Mod) using the following processes: leaching, carbon in pulp, elution (zadra process) and electro winning. My final product (sludge gold) is contaminated with excessive copper. What...
I am currently separating and extracting gold from margin ore dump (Mod) using the following processes: leaching, carbon in pulp, elution (zadra process) and electro winning. My final product (sludge gold) is contaminated with excessive copper. What...
Last replied to by Maya Rothman
and:
and:
4
REPLIES
2008
VIEWS
Started by Bob Mathias
A copper ore containing sulfite and oxide copper.Does anyone know what is the most efficient way to refine this copper concentrate?
A copper ore containing sulfite and oxide copper.Does anyone know what is the most efficient way to refine this copper concentrate?
Last replied to by JohnnyD
Yes we used a number of SX reagents and the Mextral products from Halochem performed very well. Bob has been really helpful to provide the reagents in a short time. We'll publish more detailed results...
Yes we used a number of SX reagents and the Mextral products from Halochem performed very well. Bob has been really helpful to provide the reagents in a short time. We'll publish more detailed results...
8
REPLIES
1539
VIEWS
Started by
With regards to the disposal of billet brushes' aluminum dust, what is the best way to dispose the aluminum dust produced from billet brushes in extrusion lines? Is remelting in melting furnaces safe?I am aware that the dust is highly explosive a...
With regards to the disposal of billet brushes' aluminum dust, what is the best way to dispose the aluminum dust produced from billet brushes in extrusion lines? Is remelting in melting furnaces safe?I am aware that the dust is highly explosive a...
Last replied to by JohnnyD
David, you pose an interesting point. The quantity of dust generated by rolling mill or extrusion brushes are quite low on a weight/time scale basis. Well below the expected Minimum Explosive Concentr...
David, you pose an interesting point. The quantity of dust generated by rolling mill or extrusion brushes are quite low on a weight/time scale basis. Well below the expected Minimum Explosive Concentr...
so when cleaning the gold dirt with clean muriatic acid which is the gold and which is the other metals,,. i added fresh muriatic started turning dark with a light colored sedement in bottom this is m...