Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning

Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning2017-04-21T02:33:06-04:00
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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?
Last commented on by BUBKWEY
May you please explain more on the ion exchange method that could be used in this task?
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396
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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...
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...
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645
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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.
Last commented on by fletartelavoie
I would still like to understand the reason why this would work, but we might give it a try.
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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 ...
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 ...
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343
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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.
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511
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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...
Last replied to by hjkim
leaching Copper for elctrowinning washing residue TBOC BBOC elctrorefining Ag Electrorefining Au
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684
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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...
Last commented on by Gold Fox
Thanks Renatomerino for your comments, it is very helpful..!
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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...
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...
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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...
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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/
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701
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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...
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 ...
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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...
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...
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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 ?  
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
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674
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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 ...
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...
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551
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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...
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.
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519
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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 ...
Last replied to by wassink
OK, thanks very much.
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751
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Started by johnobioma
how to smelt pure copper from the concentrate
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...
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466
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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?
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 ...
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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...
Last replied to by 2012hegga
helloo gents anyone has electrowinning cell diagram i need it
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1009
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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
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/...
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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 ...
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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 ...
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614
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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?
Last commented on by 2012hegga
Thanx david and about current
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585
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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
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762
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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.
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.
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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
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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...
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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 https://www.911metallurgist.com/gold-refinery/ https://www.911metallurgist.com/gold-silver-refine...
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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...
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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...
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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...
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 ...
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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?
Last replied to by czambrano
I remember to complete with a final step of passivation in order to recover a protective film, but this was for boiler water in calenders, not sure if suitable for Hulk´s application.
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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 ...
Last replied to by David
Wash the carbon before elution tower or recirculate elution circuit solution clean screens then start strip.
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Started by hulk
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. 
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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
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...

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