- 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.
1
REPLY
235
VIEWS
Started by Markhb
Hello. I have approx 20oz of gold that I have inquarted with copper and digested with nitric acid, 2/3 water, 1/3 nitric. I have washed, dried and analyzed it using an Olympus XRF.My problem is the presence of tin which I have read cannot be removed ...
Hello. I have approx 20oz of gold that I have inquarted with copper and digested with nitric acid, 2/3 water, 1/3 nitric. I have washed, dried and analyzed it using an Olympus XRF.My problem is the presence of tin which I have read cannot be removed ...
1
REPLY
172
VIEWS
Started by PhilN
I am a bullet caster and am being told by the very experienced smelters/casters that if I don't flux and stir the melt that as I scrape off the dross I am actually removing the tin and antimony possibly to the point of ending up with pure lead. Bei...
I am a bullet caster and am being told by the very experienced smelters/casters that if I don't flux and stir the melt that as I scrape off the dross I am actually removing the tin and antimony possibly to the point of ending up with pure lead. Bei...
1
REPLY
236
VIEWS
Started by metallurgyfan
Here in the UK, borax does not seem to be available, I have read online that it's banned due to potential health hazards. The youtube videos i've seen all use borax when melting down gold powder. Is there an alternative to borax that I can use in the...
Here in the UK, borax does not seem to be available, I have read online that it's banned due to potential health hazards. The youtube videos i've seen all use borax when melting down gold powder. Is there an alternative to borax that I can use in the...
1
REPLY
207
VIEWS
Started by gbrideau
Hi forum members, I can't seem to be able to find much information about cupelling karat gold, as in 10k rings, for example. At what temperature should I cupel a 10k gold ring? I've noticed a few posts mentioning that gold should be cupelled at ...
Hi forum members, I can't seem to be able to find much information about cupelling karat gold, as in 10k rings, for example. At what temperature should I cupel a 10k gold ring? I've noticed a few posts mentioning that gold should be cupelled at ...
2
REPLIES
541
VIEWS
Started by Reejay
Hello, I need help on the ways to improve the quality of the ash produced after incinerating fine carbon. We have introduced drier to reduce moisture but still the ash contains so much fine carbon that is not completely combusted. Please can anyo...
Hello, I need help on the ways to improve the quality of the ash produced after incinerating fine carbon. We have introduced drier to reduce moisture but still the ash contains so much fine carbon that is not completely combusted. Please can anyo...
Last commented on by SmartDog
You combust the carbon to release any trapped metals.
You combust the carbon to release any trapped metals.
2
REPLIES
580
VIEWS
Started by Woody
Hi All i have built a small drum to try and Ash Carbon which seems to work alright but needs to be tweaked. But was wondering if someone could help in the best way to get Au out of the Ash. Any help would be greatly appreciated
Hi All i have built a small drum to try and Ash Carbon which seems to work alright but needs to be tweaked. But was wondering if someone could help in the best way to get Au out of the Ash. Any help would be greatly appreciated
0
REPLIES
308
VIEWS
Started by Usmodlover
Hello. I work as a patent examiner and am working on an application for an ironmaking sinter that specifies a certain reducibility index calculated from ISO 4695:2015 and ISO7215:2015 (format of #.##). I've noticed a lot of existing information exist...
Hello. I work as a patent examiner and am working on an application for an ironmaking sinter that specifies a certain reducibility index calculated from ISO 4695:2015 and ISO7215:2015 (format of #.##). I've noticed a lot of existing information exist...
1
REPLY
371
VIEWS
Started by Soar2cLLC
I seem to be losing half of my lead collector metal during my smelt. My smelt consitentcy usually needs several reapplications of borax after already adding in 2x the sample weight of borax and 1x the sample weight of champman Flux. Its usually a v...
I seem to be losing half of my lead collector metal during my smelt. My smelt consitentcy usually needs several reapplications of borax after already adding in 2x the sample weight of borax and 1x the sample weight of champman Flux. Its usually a v...
1
REPLY
529
VIEWS
Started by morin2001
Hi I’ve got a concentrate I have made with flotation, most free gold is already out by gravity. Now I have a concentrate of pyrite gold and a trace of copper but not much. There is no arsenic. I was looking for some advice on what would be the best...
Hi I’ve got a concentrate I have made with flotation, most free gold is already out by gravity. Now I have a concentrate of pyrite gold and a trace of copper but not much. There is no arsenic. I was looking for some advice on what would be the best...
2
REPLIES
374
VIEWS
Started by Doeba0ermo
Hello everyone!I was working on a side project and while working on it, I found I needed to think of a strong gold coloured alloy that isn't too dense but still quite durable. I am in no way a metallurgist, so I'm sorry if I use wrong terms or misund...
Hello everyone!I was working on a side project and while working on it, I found I needed to think of a strong gold coloured alloy that isn't too dense but still quite durable. I am in no way a metallurgist, so I'm sorry if I use wrong terms or misund...
Last replied to by SmartDog
There are several metallic alloys that have a golden color some contain no gold (see pinchbeck), the main issue being what physical properties are you interested in as this makes a big difference.
There are several metallic alloys that have a golden color some contain no gold (see pinchbeck), the main issue being what physical properties are you interested in as this makes a big difference.
1
REPLY
513
VIEWS
Started by benport
I put a handful of buttons in a 6" cupel and placed it in the furnace. When I checked it the cupel had cracked and the melt gone inside the cupel. What is the best way to recover it?
I put a handful of buttons in a 6" cupel and placed it in the furnace. When I checked it the cupel had cracked and the melt gone inside the cupel. What is the best way to recover it?
1
REPLY
779
VIEWS
Started by randy N
can anyone tell me how to refine the titanium disks in cpu i have 4 disks and am wanting to try
can anyone tell me how to refine the titanium disks in cpu i have 4 disks and am wanting to try
1
REPLY
517
VIEWS
Started by Bhaduri
I need some input on design-engineering & ultimately EPCM US (overseas will work) based entities who have experience building up-to 50,000-mtpy spent catalyst recycling plants...both base (Mo, W, Ni, Co, V) & precious metal (Pt, Pd) spent catalyst ex...
I need some input on design-engineering & ultimately EPCM US (overseas will work) based entities who have experience building up-to 50,000-mtpy spent catalyst recycling plants...both base (Mo, W, Ni, Co, V) & precious metal (Pt, Pd) spent catalyst ex...
Last replied to by SmartDog
Are you still looking for a consultant/EPCM for spent catalyst?
Are you still looking for a consultant/EPCM for spent catalyst?
7
REPLIES
659
VIEWS
Started by randy N
i now have about 10 gallons of muriatic acid peroxide and water in 2, 5 gal. buckets and im sure my gold disolved with the tap water i need help to recover my gold from the 10 gal of mixed liquids and need to know what to buy and how to recover f...
i now have about 10 gallons of muriatic acid peroxide and water in 2, 5 gal. buckets and im sure my gold disolved with the tap water i need help to recover my gold from the 10 gal of mixed liquids and need to know what to buy and how to recover f...
1
REPLY
513
VIEWS
Started by TENET
Hello Friends, I am very glad to have found this forum. I hope the expertise here can shed some light on something I've been trying to research. In Japan, I found several old silver/ copper/ gold refineries. They were abandoned sometime in the late ...
Hello Friends, I am very glad to have found this forum. I hope the expertise here can shed some light on something I've been trying to research. In Japan, I found several old silver/ copper/ gold refineries. They were abandoned sometime in the late ...
3
REPLIES
691
VIEWS
Started by Ashir hashmi
Hi everyone I have a sulphide ore concentrated by flotation, contains au, PD, rh, ir (according to fire assay) I am looking to smelt the concentrates, any one can help?
Hi everyone I have a sulphide ore concentrated by flotation, contains au, PD, rh, ir (according to fire assay) I am looking to smelt the concentrates, any one can help?
Last replied to by Wieslaw Wodecki
Jeżeli to jeszcze aktualne ... Jakoś ten temat wcześniej przeoczyłem... 1. Stężony HNO3. Gotowanie do zaniku NO2. Przefiltrować i odstawić do redukcji Pd Redukcja Pd : kwas mrówkowy + s...
Jeżeli to jeszcze aktualne ... Jakoś ten temat wcześniej przeoczyłem... 1. Stężony HNO3. Gotowanie do zaniku NO2. Przefiltrować i odstawić do redukcji Pd Redukcja Pd : kwas mrówkowy + s...
2
REPLIES
590
VIEWS
Started by 7CHEESE8
I have refined gold with ar with success. I have gold silver amalgam that I'm not sure what the steps are to separate the metals. Gold and silver amalgam come from where I'm working. I started by retorting the amalgam. I'm guessing a nitric bath. T...
I have refined gold with ar with success. I have gold silver amalgam that I'm not sure what the steps are to separate the metals. Gold and silver amalgam come from where I'm working. I started by retorting the amalgam. I'm guessing a nitric bath. T...
Last replied to by Nonoy Celera
Retort the amalgam to removed the hazardous mercury. The mercury-free sludge can be melted in an appropriate flux to slag-out base metals in the sludge. You will produce a silver-gold dore'. If you ne...
Retort the amalgam to removed the hazardous mercury. The mercury-free sludge can be melted in an appropriate flux to slag-out base metals in the sludge. You will produce a silver-gold dore'. If you ne...
0
REPLIES
697
VIEWS
Started by shaurytheseth
Currently we are refining raw god(old jewelry) using silver and nitric acid, and are able to achieve purity of 99.50%, but are not able to remove trace amounts of iridium, ruthenium and osmium. Fire assay method gives purity of approx. 99.50%, but XR...
Currently we are refining raw god(old jewelry) using silver and nitric acid, and are able to achieve purity of 99.50%, but are not able to remove trace amounts of iridium, ruthenium and osmium. Fire assay method gives purity of approx. 99.50%, but XR...
1
REPLY
544
VIEWS
Started by nshiva20
I would like to know in which form, the impurities used to present inside ETP copper and its effects on electrical conductivity.If its affects electrical conductivity,either impurity in solution affects more or in complex mixture affects more?
I would like to know in which form, the impurities used to present inside ETP copper and its effects on electrical conductivity.If its affects electrical conductivity,either impurity in solution affects more or in complex mixture affects more?
1
REPLY
579
VIEWS
Started by rachit
Hi all, Does anyone know what can be done to avoid freezing issues or ore in silos in temperature as below as -40degrees celsius. We are using calcium chloride solution but it doesnt seem to be helping alot.
Hi all, Does anyone know what can be done to avoid freezing issues or ore in silos in temperature as below as -40degrees celsius. We are using calcium chloride solution but it doesnt seem to be helping alot.
Last replied to by SmartDog
The only thing that seems to work reliably is using heat tracing, but this can be expensive depending on the silo size. Also at -40 degrees you do not need to specify Celsius or Fahrenheit as they ar...
The only thing that seems to work reliably is using heat tracing, but this can be expensive depending on the silo size. Also at -40 degrees you do not need to specify Celsius or Fahrenheit as they ar...
1
REPLY
528
VIEWS
Started by Gabriel
Hello everyone, could someone tell me a company that sells a complete solution for roasting + gas treatment? It's for gold ore. My need is to process 200,000t at a rate of 20 to 30 t / h, depending on the roasting capacity. I will use a maximum temp...
Hello everyone, could someone tell me a company that sells a complete solution for roasting + gas treatment? It's for gold ore. My need is to process 200,000t at a rate of 20 to 30 t / h, depending on the roasting capacity. I will use a maximum temp...
2
REPLIES
832
VIEWS
Started by platinum01786
I Currently have an aqua regia refining plant from italy which refines 15kg Gold at a time.after our refining process we notice that the gold we refine is normally between 999.6-999.9however the final surface of the gold has rough edges and has a dul...
I Currently have an aqua regia refining plant from italy which refines 15kg Gold at a time.after our refining process we notice that the gold we refine is normally between 999.6-999.9however the final surface of the gold has rough edges and has a dul...
Last replied to by Wieslaw Wodecki
Au powder after reduction and digestion with HCl, rinsing with water, pour 5 - 10% NH4OH. Then rinse thoroughly with water before granulating. Probably the fogging can be due to AgCl which is dissolv...
Au powder after reduction and digestion with HCl, rinsing with water, pour 5 - 10% NH4OH. Then rinse thoroughly with water before granulating. Probably the fogging can be due to AgCl which is dissolv...
1
REPLY
580
VIEWS
Started by Silverhair
I have 26 kg of pure silver nitrate I am going to make to metal using aluminum, copper or zinc metal. Which solution is easiest to dispose of safely? I want to refine the silver sludge using electrolysis. Will I have to dry it and melt it into an ele...
I have 26 kg of pure silver nitrate I am going to make to metal using aluminum, copper or zinc metal. Which solution is easiest to dispose of safely? I want to refine the silver sludge using electrolysis. Will I have to dry it and melt it into an ele...
Last replied to by Wieslaw Wodecki
Pure AgNO3 is already suitable for electrolysis without reducing silver with Zn, Cu, Al. 1H18N9T steel electrodes or similar. Voltage below 5V, preferably 0.5-2V.AgNO3 solution must be acidified with ...
Pure AgNO3 is already suitable for electrolysis without reducing silver with Zn, Cu, Al. 1H18N9T steel electrodes or similar. Voltage below 5V, preferably 0.5-2V.AgNO3 solution must be acidified with ...
0
REPLIES
676
VIEWS
Started by keshab Meher
We want to do the calcination of Gypsum which is received in the form of Lumps and then crushed to the required size, which is in turn calcined and again grinded to get the desired particle size. The finished good is the Calcined Gypsum Powder of req...
We want to do the calcination of Gypsum which is received in the form of Lumps and then crushed to the required size, which is in turn calcined and again grinded to get the desired particle size. The finished good is the Calcined Gypsum Powder of req...
0
REPLIES
551
VIEWS
Started by Tom Cobett
We have extracted PGMs into an Fe matrix dore'. We would like to move the PGMs into a Cu dore'. What is an easy way to oxidize the Fe out of the furnace after we have melted Fe and Cu together? Will everything go into the Cu?
We have extracted PGMs into an Fe matrix dore'. We would like to move the PGMs into a Cu dore'. What is an easy way to oxidize the Fe out of the furnace after we have melted Fe and Cu together? Will everything go into the Cu?
0
REPLIES
1017
VIEWS
Started by sanwalzafar
Hello Guys. I am a researcher and I need to know what flux can we use to purify zinc dross 95% (containing 1-3% iron and 1-2% aluminum). Please suggest a flux that can be used to achieve 99% plus purity. Thanks
Hello Guys. I am a researcher and I need to know what flux can we use to purify zinc dross 95% (containing 1-3% iron and 1-2% aluminum). Please suggest a flux that can be used to achieve 99% plus purity. Thanks
1
REPLY
614
VIEWS
Started by Jorge Quintanilla
Good afternoon everyone. I hope none of you have had problems with covid, please take care. My query is about a rotary dryer for tin concentrate. I am working on an expansion project for the Colquiri mine in Bolivia. In a mine that has a technical au...
Good afternoon everyone. I hope none of you have had problems with covid, please take care. My query is about a rotary dryer for tin concentrate. I am working on an expansion project for the Colquiri mine in Bolivia. In a mine that has a technical au...
Last commented on by Jorge Quintanilla
Thank You very much. You clarified the idea for me.
Thank You very much. You clarified the idea for me.
1
REPLY
1062
VIEWS
Started by Adimulu
Dear All We ruining CIL plant , after stripping we wash the gold mud by nitric acid and then we add HCl to precipitate silver in the solution to form silver Chloride ,since the beginning We have collected about 6 tons silver chloride. We used to s...
Dear All We ruining CIL plant , after stripping we wash the gold mud by nitric acid and then we add HCl to precipitate silver in the solution to form silver Chloride ,since the beginning We have collected about 6 tons silver chloride. We used to s...
1
REPLY
771
VIEWS
Started by mehrdadtaheran
I am new to electrowinning and I want to start a setup in our center for working on zinc electrowinning. I do not know which type of potentiostat (the associated parameters)will be OK for a research project? If anyone can help, I appreciate that.
I am new to electrowinning and I want to start a setup in our center for working on zinc electrowinning. I do not know which type of potentiostat (the associated parameters)will be OK for a research project? If anyone can help, I appreciate that.
6
REPLIES
997
VIEWS
Started by Adimulu
Hello, We have silver chloride precipitate , we want to smelt it. Is there anyone who have smelted. Regards,
Hello, We have silver chloride precipitate , we want to smelt it. Is there anyone who have smelted. Regards,
Last replied to by Wieslaw Wodecki
Suspended (very fine) silver in gelatin should fall off when heated and added water. 2. After adding plenty of warm water and dissolving the gel (turning the gel into sol), add the anionic floccul...
Suspended (very fine) silver in gelatin should fall off when heated and added water. 2. After adding plenty of warm water and dissolving the gel (turning the gel into sol), add the anionic floccul...
1
REPLY
709
VIEWS
Started by Shiff
Just a quick question that will most likely make me look new which I am. But can I use an ingot mold for both molten copper and silver Or would they contaminate each other? And same question with the crucible Ben
Just a quick question that will most likely make me look new which I am. But can I use an ingot mold for both molten copper and silver Or would they contaminate each other? And same question with the crucible Ben
Last commented on by SmartDog
There are several people on this site who can provide consulting help. But you need to be more specific. What do you need help with, where do you need help at, and are you looking hire someone or lo...
There are several people on this site who can provide consulting help. But you need to be more specific. What do you need help with, where do you need help at, and are you looking hire someone or lo...
The most likely reason would be poor control during the smelting proces allowing for poor mixing in the cupela or a batch of material with the wrong percentages in the mix. Another possibility would ...