Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning

Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning

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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...
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Started by plorenzi
Hydropore is a start-up company that has spun out of the University of Pennsylvania Materials Science and Engineering labs (www.hydropore.com). Our product is nano-porous aluminum which is made using an electrochemical de alloying process. The closes...
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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...
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Last replied to by Jorge
It is important to eliminate the mercury by distillation. The product containing silver should be ground, approx. 80-90% passing 200 mesh. Then, dry the material to evaluate the effect of hot nitric a...
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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?
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Last replied to by Jorge
During the electrolytic process some metals are in competition in the reduction process. They are the arsenic, antimony, bismuth, nickel, cobalt and iron, which can be accumulated in the anode dissolu...
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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. 
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...
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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...
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Last replied to by Jorge
I think you should contact Outotec. They have good experience on roasting processes to treat different ores
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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...
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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...
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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...
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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 ...
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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...
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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?
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Started by Jkleinhenz
 
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Last replied to by Jorge
If you are talking about assaying, it is possible to use citric acid to determine the presence and content of copper oxide minerals. Some labs in Chile use citric acid to perform sequential copper ana...
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Started by BentFunky
I’m pretty new to pyrometallurgy, so apologies if this is a noob question. Asking for help understanding the appearance of metal retrieved after smelting gold ore. I was testing/tuning a new furnace by smelting a small amount low quality gold ore...
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Last replied to by Wieslaw Wodecki
Ten stop wygląda rewelacyjnie .Kolor perłowy stopu z małym dodatkiem Cu wyglądałby jeszcze lepiej.  Wyroby jubilerskie z takiego stopu i takim wyglądzie mogą być dużo warte -nikt takich nie ...
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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
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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...
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Last commented on by Jorge Quintanilla
Thank You very much. You clarified the idea for me.
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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...
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Last replied to by Todd H
There are a number of ways to do this.  You can convert the silver to metallic form with dilute sulfuric acid and iron fillings.  You can test this in the lab, you add an equal weight of iron (steel...
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Started by elie
Hello all, this may be a bit of an unusual question. I would please like to seek expertise on estimating the melt value of Lebanese Pounds coins, the 500 LBP and 250 LBP denominations. I can potentially send samples if needed.References to the coins ...
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Last replied to by Todd H
These coins are worth more as currency than as metal - according to the site they are steel plated with nickel and would be worth something of the order of 4 to 5 US cents per pound as scrap.
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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?
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Last replied to by rob riggir
Best to use anhydrous borax at 1200C You may need other fluxes depending on impurities. Cheers
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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.
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Last replied to by Todd H
You will need to know the desired current density and the overvoltage required for your system.  You will need to use you cathode size to compute how much current you need based on you density and th...
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Started by Adimulu
Hello, We have silver chloride precipitate , we want to smelt it. Is there anyone who have smelted.   Regards,
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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...
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Started by Adimulu
Dear All We run CIL plant , at this time we have large amount of fine carbon collected with grade 100-150 g/t, with current high gold price we are thinking a way to get the gold. Is there any proved method to recover gold from fine carbon.   Reg...
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Last replied to by SIMetallurgist
Speaking for the US - Just Refiners Inc. in Nevada. Also if you want to purchase a unit. https://www.kcareno.com/kca-carbon-converter  
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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
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...
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Started by Vincent Cherico
Hi, my name is Vin, and I am not a metallurgist. And have no idea what I am talking about. ? However I am writing an article which touches on the recovery of gold from jewelry scrap in the 18th and 19th centuries. Is there anyone out there that is ve...
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Last commented on by Vincent Cherico
Thank you so much for your input!
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Started by Millza79
What is the minimum Sulphur grade that you could sell a pyrite flotation concentrate to a pyrite roster? I would have thought it would have to be at least 45% Sulphur.
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Last replied to by afxdes
If the concentrate contains significant quantities of gold (and silver), it does not have to end up at a roaster. A smelter can take it. Payabilities on precious metals may also be higher.
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Started by nhngh
For the pyrometallurgical processing of Gibbsite using carbon as the reducing agent. The process uses ROM ore as the feed stream, and has Aluminium metal as the product, can I use Bayer process and Hall–Héroult process?
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Last replied to by Vincent Cherico
My apologies, I thought this was going into a general box and not a specific answer to you question. Sorry about that. Vin
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Started by cmrosso
Good day, We run a Zadra elution circuit and we usually use a carbon call (using loaded and barren carbon values) to determine what gold bar we might pour. However, we also keep track of our eluant call (using pregnant solution and barren solution v...
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Last commented on by Abena Yeboah
Hello Todd I am a recent graduate in metallurgist. Can you kindly thow more light on how poor flow can cause such divergence?
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Started by Explorer
Which tabletop electric furnace would be suitable for smelting gold ore 
Last commented on by SmartDog
Try this: https://www.instructables.com/id/microwave-smelter/
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Started by Millza79
For a magnetite concentrate that reports to a pelletising plant, what is the mass increase (say as a %, i.e. 105%) due to the pelletising reactions?
Last replied to by SmartDog
Since you are not changing the amount of material, just how they are combined the only change will be the driving off of any volatile material.  If you are ignoring the water (the bulk of the volatil...
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Started by indunil
hello friends . i need a little help here  I have mixed hcl and bleach with an ore i found near by and it went well in first steps came out nice yellow orange look and filtered out the existing grain out .  but nothing happens with sodium metabi...
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Last replied to by Todd H
I am not sure what chemistry you are using here.  Hypochlorite (bleach) will dissolve gold and this gold can be precipitates by the degradation of the gold chloride. This might help: https://www.91...
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Started by paigekru
Hi, I am new to working with metals, and was hoping someone could assist me with sizing electrowinning cells. I have a zinc battery and I am considering swapping out my charge reactor with electrowinning cells, but I have no experience with the topic...
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Last replied to by Todd H
If you provide more details i may be able to help.  What are you trying to electrowin?  It looks perhaps like you are trying to make a battery. Regards  
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Started by Tererai
Hi guys, can you assist me with info -: Gold smelting and Refinery  Silver smelting and Refinery
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Last commented on by Tererai
Thank you very much, very much useful.
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Started by Zhanbolat
Hi guys! Does anybody reccomend an effective way to grind the zinc calcine after roasting? Or how you reccomend control the particle size of calcines in and after roaster to avoid problems in further leaching.  Here we have air separation and then...
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Last replied to by zincmet
Hello   i just joined and saw this old thread. zinc roaster calcine is ground in dry or wet ball mills. The most common practice involves cooling the calcine with a rotary water-tube cooler or a f...
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Started by Jeffreybch
Hi, We normally reduce our loaded electrowinning Steel Wool with Sulphuric acid, then the acid is removed and the remaining materials are washed and dried. Later the dried materials are mixed with the following flux:60% Borax, 20 Niter, 5% Soda Ash...
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Last replied to by AJ
Hi Jeffrey We occasionally see this black material too... I would suggest that it is an excess of iron from your cathodes, a solution for this problem would be to allow more time (or acid) for your ...
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Started by Scotman
I have a slag dump that contains various grades of Zn, Pb as well as Ga and Ge. Is there a technology or process available that can economically extract these metals?  Thank you 
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Last commented on by Scotman
Hi Todd I have a complete CPR on the slag pile - it has been grid - drilled and assayed and which shows good grades of the above metals. What I am now looking for is a company that has experience i...
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Started by lerpollock
I work with non precious metals such as aluminum, brass, and steel for my jewelry. I have recently been working with an aluminum bronze alloy called C954. After doing some research online, I came across some information that said aluminum bronze has ...
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Last replied to by lerpollock
Thank you. I should be able to find what I'm looking for and get some answers too. Very helpful. Much appreciated.
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Started by metallurgyquest
The 6 metals in equal amounts. Through the melting method in a foundry. Not the powder method. Or will this end up not mixing and having cracks due to not adhering to the Hume-Rothery rules? And if not an alloy then what will happen once all 6 are ...

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