Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning

Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning

  • To participate in the 911Metallurgist Forums, be sure to JOINLOGIN
  • 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.

6
REPLIES
1214
VIEWS
Started by Teggry
Hi, Why is Lead Nitrate put into the Electrowinning cell before the electrowinning starts. What is its purpose? The Met said it was just to make the operators job easier but did not need to be done.
C
Last replied to by CharMet
We are conquering a plating issue with our gravity circuit EW and told about adding Lead Nitrate. However, this is the only place online I have found it mentioned. Does anyone have any sources for thi...
1
REPLY
868
VIEWS
Started by Mista
I have a pregnant solution with grade 4 ppm. we send big amount of pregnant solution to activated carbon ,when we burn carbon and melt the ash we didn’t get gold ? can I get some help to solve this problem?
B
Last commented on by BUBKWEY
May you please explain more on the ion exchange method that could be used in this task?
3
REPLIES
882
VIEWS
Started by jovanifirebird
hello metallurgists. we have had an issue of importing HCL to our gold processing plant. delivery date is getting delayed. however, we do have stocks of 55% H2O2 in our site. do you think it is possible to replace HCl with 55% H2O2 for carbon washing...
G
Last commented on by Teggry
Good answer Mark
2
REPLIES
877
VIEWS
Started by FranLaraMonge
I am Francisco Lara Monge, peruvian chemical engineer working in a flotation plant in Ecuador. Few days ago, for second time, we have a bigbag, with low grade concéntrate, which have violent reaction producing SO2, high temperature 250°C, and with ...
R
Last replied to by Richard S
My first best guess is that you have pyrrhotite in your concentrate.  It is known for spontaneously combusting at ambient temperatures particularly if there is moisture present in the concentrate.  ...
3
REPLIES
2690
VIEWS
Started by zwivhuya
i would like assist on how i can remove silver metal from an ionic insoluble silver chloride.
M
Last replied to by inOr
Cyanide leaching extracts silver from sulfide ores.  I don't know how well it works on silver chloride, though. If it works, then there are several methods for recovering metallic silver from the cy...
4
REPLIES
1064
VIEWS
Started by oro
For batch leach samples - instead of stripping the AC I was wondering if it can be smelted, maybe with a bit of litharge as a collector and some borax to slag off contaminants.  I understand the carbon can be “ashed” in an electric muffle furnac...
J
Last replied to by oro
Rob, So...ash / smelt in the same vessel and furnace, an elegant solution.  thank you!            
1
REPLY
799
VIEWS
Started by chemgla68
I have been using a traditional muffle style furnace for years and am looking to speed up the process by switching over to an induction furnace. My question is this - does an induction furnace lower the overall hi temp needed to process ores containi...
N
Last replied to by Nije
I run five different sized induction furnaces starting at 2 kgs and working their way up to 500 kgs and the one thing I know is that its almost impossible to hold the temperature steady. It is possibl...
2
REPLIES
3441
VIEWS
Started by
Have been told there are ways to use certain chemicals to help break down black sands, then cook it and kiln it to make a Dore bead. Have sands with gold, silver and platinum but is very fine and is attached in the sand unless it is ground up.  Any ...
6
Last commented on by
What chemical do you use for the bio leaching process? You can give a call or text if you don't want to post to the world 307-272-9814. Have another guy says Clorox and table salt will pop open and ...
1
REPLY
761
VIEWS
Started by H.OK
Hi, I am currently doing a study on the reuse of concrete (to avoid landfill) and I am looking for applications within the mining industry. Smelting is one option, as the heat would allow for any contaminants within the concrete to be destroyed in t...
Last replied to by bernhards
https://www.slimbreker.nl/smartcrusher.html Something like this? A dutch company recycles on site, and so on.
2
REPLIES
918
VIEWS
Started by paulbwalya
We will be producing an alloy with the following specs Cu 76% Ni 0.42% Pb 12% Ag 1.53% Au 10% I am looking at electro refining of this alloy and treating the slimes for gold recovery. any though of the idea and suppliers for small scale El...
H
Last replied to by hjkim
leaching Copper for elctrowinning washing residue TBOC BBOC elctrorefining Ag Electrorefining Au
3
REPLIES
1307
VIEWS
Started by Gold Fox
What would be the ideal process to recover Gold from sulphides once I have concentrates, I have read that roasting first and second smelting it directly with Chapman flux? it is a non leaching process. I am looking also for best way to get free gold...
C
Last commented on by Gold Fox
Thanks Renatomerino for your comments, it is very helpful..!
8
REPLIES
1237
VIEWS
Started by CA
We built and operate a 100kg zadra/zadra with alchohol stripping system that we have used successfully for a a while now. We recently began (trying) to strip carbon from a non-cyanide leach pilot plant and are unable to elute the gold from the carbo...
H
Last commented on by CA
Deano, Well, all of a sudden the gold is coming off of the carbon and we are getting excellent stripping results. We are not doing a pre-hydrochloric wash and are using a 10% ethanol, 12g/l NaOH, an...
1
REPLY
1637
VIEWS
Started by doum
I need a way to extract the gold from those rock....i need it simple because it is for pleasure...THANKS! I've try to crush it, roast it,and melt it whit Chapman flux (2 part of flux for 1 of materiel) for 1hrs in my propane furnace but the only thi...
Last replied to by David
What you are hoping to do, directly on rock, is not something the heavy mining industry normally does. It's nothing I know much about for sure. Try this maybe. https://www.youtube.com/watch?v=YGaCQY...
1
REPLY
1120
VIEWS
Started by Scotman
I have a supply of high grade (+50gm/t) wood chip ash, as well as a supply of loaded carbon fines. What would the process be to recover the gold from these products?  Is there a pyromet process that one could undertake, and then leach the gold? 
Last replied to by David
Did you see https://www.911metallurgist.com/pyrometallurgy/ashing-of-gold-activated-carbon-and-its-recovery/
4
REPLIES
1333
VIEWS
Started by hulk
HI; In our plant we noticed a massive corrosion   of electrolysis cells anodes ; however, we comply with all Operations instructions: pH> 12; 1-2% NaOH.We suspect the presence of chlorides from the acid wash.Is there any process that would allo...
S
Last commented on by Cadia Systems
Be aware the pH requirement is to maintain above pH > 12.6 and this should always be measured by titration and not the use of a pH probe. Chlorides will attack the grain boundaries of your anodes ...
3
REPLIES
1800
VIEWS
Started by mohammed_tawfik
And could i use a zadra cells for one tone of active carbon ? Which pregnant solution does it work on ? does it work  after the active carbon or don't  require active carbon stage ? What is the recovery rate of the cell ? o...
m
Last replied to by mohammed_tawfik
Procedures. Inorganic Concentration: Lead - AcidReagentsC Granulated lead: + 10 mesh - (screened test lead may be used)C Concentrated HClC Lead Foil (7.5 cm x 7.5 cm)C Ag for inquartation (AgNO3, soli...
1
REPLY
1093
VIEWS
Started by mohammed_tawfik
i ask about gold pairing carbon  if i want to get the gold  from the carbon by smelting , do i smelt the carbon directly or their is another method ?  
m
Last commented on by mohammed_tawfik
so i need a muffled furnace , the carbon column is about one tone you suggest ashing every batch then smelt it
3
REPLIES
1070
VIEWS
Started by Vishnu patel
i would like to know the process and some technical details to process copper metal with recovering of gold by electrowinning, could any please suggest how to start with....is it possible to recover gold from electrowinning of copper metal (dross or ...
Y
Last replied to by Yves
I would Prepare an electrolyte made of copper sulphate and sulphuric acid then contact the ingot on the + side with a graphite rod and the - on a stainless steel plate using a high DC current. The cop...
4
REPLIES
979
VIEWS
Started by clyde
Hello,I'm a junior geologist and I have a few questions concerning the fire assay fusion that labs use to determine Au concentration.If I have a gold ore associated with Quartz SiO2, since quartz's melting point is around 1700°C and the fire-a...
F
Last commented on by Siddiquf
If gold is trapped inside sulphides, for example pyrite, roasting the ore sample.at +600 degrees C, followed by Fire Assay can give a correct result.
2
REPLIES
930
VIEWS
Started by wassink
I'm looking for information (data or literature) on water evaporation rates in copper EW. There are lots of factors that will affect this - electrolyte composition and temperature, ventilation, foam mist suppression or not, etc. But, I presume there ...
B
Last replied to by wassink
OK, thanks very much.
1
REPLY
1347
VIEWS
Started by johnobioma
how to smelt pure copper from the concentrate
M
Last replied to by mkasebake
Consider the following.. Type of concentrate (e,g. Chalcopyrite, chalcocite, Bonite, etc.) You will need to know the quality of the concentrate, specifically the oxides present and their melting poi...
3
REPLIES
843
VIEWS
Started by biteyaboy
I am looking possibility of smelting concentrate to copper bar with 102 ppm of Au and 23% of Cu. Is that possible to do this job by furnance with 3000 degree? I want copper and gold to be on the same bar. How can i do this?
C
Last replied to by Colette
Are you calcining or otherwise oxidizing the concentrate before the smelt? If you actually want to recover copper then you are probably going to struggle to get a decent bar, as the oxidation process ...
7
REPLIES
1909
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...
S
Last replied to by 2012hegga
helloo gents anyone has electrowinning cell diagram i need it
2
REPLIES
2525
VIEWS
Started by biteyaboy
Is there any difference if i use glass bottle and grind it as silica poweder and using silica powder already made in factory? Let me know your thought
b
Last replied to by Robert
Glass is not silica. If you need silica as opposed to a mixture of oxides, you must buy silica (SiO2). Take a look at 'chemistry of glass' from Corning Museum of Glass: https://www.cmog.org/article/...
2
REPLIES
863
VIEWS
Started by RenniePet
And now for something completely different ...I'm an aspiring author and am writing a thriller based on "the Polish gold train". https://en.wikipedia.org/wiki/Nazi_gold_trainThe heroes (?) of my book have found the train and the gold. They wish to co...
Last replied to by RenniePet
For what it's worth, here is what it says in the current draft copy of my book:"Mariusz then purchased an induction melting furnace capable of melting a gold bar (12.5 kg), and 30 graphite molds into ...
2
REPLIES
985
VIEWS
Started by Ahmed Zaky
I have ( gold - lead - silver)  and i ask if it is suitable to make parting for alloy to separate gold from lead and silver by nitric acid instead of cupellation by using bone ash       Thank you
Last commented on by .999
Yes! Lead will dissolve fairly readily in hot weak nitric - 7 parts distilled water and 1 part concentrated nitric acid ( 67-69% ). You can't use strong nitric because lead nitrate crystals will form ...
1
REPLY
997
VIEWS
Started by 2012hegga
Hi. i have a small question i want to know, how many voltage in high pressure elution and current suppose to be?
S
Last commented on by 2012hegga
Thanx david and about current
1
REPLY
974
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...
Last replied to by Sandeep Bisht
You mean like this? https://www.911metallurgist.com/blog/crushing-grinding-wet-ores
3
REPLIES
1174
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.
S
Last commented on by sarchery
Ibrahima If you don't have a lot of sulphides and have calcined your ore- you can leave out the soda ash. Try as % of concentrate mass: 80% borax, 25% silica and 25% potassium nitrate.
3
REPLIES
1293
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...
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
2
REPLIES
1633
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 ?
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...
1
REPLY
1333
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...
Last replied to by David
Hi Biteyaboy, Be sure to review https://www.911metallurgist.com/blog/gold-smelting-refining-process
Gold Refinery Procedures
https://www.911metallurgist.com/gold-silver-refine...
11
REPLIES
1348
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...
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...
0
REPLIES
945
VIEWS
Started by soheil8
Hello dearsWe have an iron sintering plant. capacity of the plant is 800000 ton per year. Unfortunately, blast furnaces project because of Doing not allow the government exchange and I don't sell the product. Do you have a solution for the profitabil...
2
REPLIES
1091
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...
D
Last replied to by Deano
The only way to find out what effect re-use of your eluate has is to actually re-use it several times and see what effect it has on stripping times and final gold on carbon level. Make sure that the ...

Please join and login to participate and leave a comment.