Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning

Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning

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Started by WildWestMining
Hello, I am an artisnal miner in northern Arizona and am having trouble fluxing a sulfide ore. The ore is composed mainly of arsenopyrite, pyrite, galena, and polybasite. There is minor barite present as well. The ore was crushed to 150 micron and ca...
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Last commented on by WildWestMining
I screen mine to -100# before roasting, I've had success using a cast iron skillet over an open fire. I stir frequently for about 2 hours and then let it sit on the coals overnight. Using this method ...
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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 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 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 aeolson
Having some issues with all of a sudden brittle dore bars from our ILR.    The bars used to run about 95% combined Au/g.   However this has dropped to to around 80% with the new actor being pb. Cu is about 4 ppm On a typical batch we use 6 to 7 ...
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Last replied to by Todd H
What is the source of the Pb?  It is best to try and remove this before the ILR. I would suggest increasing the oxidizer in the flux and perhaps the silica.  I would test this at a small scale firs...
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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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Started by Seeker
How to recover lead and tin separately from the solution containing chlorides of lead and tin through electrodeposition? Thanks!  
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Started by Teggry
Hi, Can anyone tell me why Magnsesium dioxide would be used in a flux mix for smelting gold?
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Started by Mineshaft
I am going to be conducting a test plot regarding phyromining this summer, and was curious if anyone knows what I should use as a lixiviant to make the gold water soluble in the ground for optimum plant uptake? I would love to stay clear of cyanide ...
Last replied to by SmartDog
As in any metallurgical process the issue is the rate at which the process works.  If a gold lixiviant is used (similar to the ones that Todd mentioned), the rate of metals uptake by the plant versus...
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Started by Tawaz
I am not a metallurgist, but a miner owning a small claim with high grade copper ores, 20%-40% with an average 35% iron content. I don't have the capital to buy expensive smelting equipment and would like to start by doing small 100kg batches in a  ...
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Started by pelo
currently i am experiencing low gold purity and high silver in my bullion an my flux ratio is borax 60%,niter 20%, silica 10% and soda ash 10% please help out
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Last replied to by Deano
I assume that you have previously had higher gold purity in your bars. What I need to know is the previous purity and what gold and silver levels are you now getting. Also I need to know what metals...
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Started by LANGY
am looking the best and effective continuous method  for drying fine magnetite concentrate from a plant that produces 6000tpm. the magnetite is being produced as a by-product from flotation of phosphate. the problem is that its taking long to dry a...
Last replied to by SmartDog
The two simplest methods would be either a rotary dryer (kiln) or a torus disk dryer.  The rotary dryer is the simplest to operate, but may require air emissions permitting.  The torus disk units re...
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Started by Wulvzy
Not a metallurgist, just a blacksmith who is somewhat familiar with steel from reading. so bear with me here because i have to explain in simpleton terms. Attemping to bypass conventional steel bloomery and smelting by loading pure ingrediants -325 ...
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Last replied to by Wulvzy
Should add: current estimate ratio is 30% charocoal powder 30% ironpowder, 30% 1084powder, 5% borax mixed evenly with other ingrediants, remaining 5% glass placed at top of canister pre sealing.
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Started by Moonglow
I'm trying to figure out which has greater yield of gold in general.
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Last replied to by Moonglow
But good answer SmartDog, I just really wanted to know the math!
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Started by Moonglow
I'm looking for a credible supplier that has good quality, preferably old CPU's, and has solid reputation.
Last replied to by SmartDog
Kind of depends where you are looking for them.  First thought would be to go to a local services directory and look up e-waste collectors and processors.
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Started by wageeh
hello all, how are you, if i have zirconia ( ZrO2 ) and yttria ( Y2O3 )  powders, what is the best cheapest method to produce yttria stabilized zirconia? 
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Started by Danihani
Which water is good for making your AAS standard, OR or UP water?
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Last replied to by StefanJov
Water with conductivity below 1 us/cm or better is fine.  Laboratory water affects the sensitivity and detection limits of the flame technique for some elements. 
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Started by Millza79
In bench tests for testing the amenability of a pyrite roaster, is the air continually added throughout the test, or is it just added at the start?
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Last replied to by Todd H
Air is supplied throughout the whole test.  The idea is to oxidize all the sulfide so the reaction requires an excess of air to make sure there is no oxygen limitations.
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Started by BUBKWEY
I have some tons of old Carbon that I keep in my store room after Elution.  Their grade isn't economical enough to take them all for other Elution processes.  May I please know the details of controlled burning, which kind of heat source is the b...
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Last commented on by BUBKWEY
Thanks Jorge.. The info in the link was a great mind opener to me..
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Started by mikewj
Anyone have a rule of thumb on how often the activated carbon inventory should be turned over through elution/regen in a gold CIL/P plant? I've heard 7 days. 
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Started by johnywhy
This question concerns the making of alloys for casting. I need a low-toxicity, low-melting point metal, to cast hardware parts. The parts must not crack under torque or impact, and should remain hard up to 100 deg C. My plan is to make a Tin/Bism...
Last replied to by johnywhy
I'm not committed to tin, bismuth, or silver. But need to keep things relatively low-toxic and low-temp. (home, indoor fab). Need to minimize shrinkage/expansion of cast part. 
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Started by oro
I’m wondering if I’m in the ballpark with this and how scaleable it might be. 2.5 L of solution1% cyanide1% sodium hydroxide2% alcohol - 700g of activated carbon w/ aprox 2-3 g of gold- carbon is wrapped in mosquito netting- anode is a carbon /...
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Last replied to by oro
Next day update...unfortunately the whole thing evaporated overnight! ...but seems like it worked, nice gold wool. I assume a single vessel to heat and electrowin can only be done using non conductive...
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Started by Rashid
Hello Guys, How can I increase Gold Purity during smelting by using ratio of fluxes, Currently I'm experiencing high silver in dore with low Gold purity. Fluxes Ratio used; Borax - 38% Silica - 10% Soda - 3% Nitre - 6% 
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Last replied to by rushcard1
Rashid:  I don't believe you are going to achieve what you want by adjusting the fluxes, although I am not an expert on them.  I do know you can spin your wheels with numerous experiments that deal ...
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Started by Eagle788
Hello guys, I have absolutely no knowledge of the fascinating science of metallurgy. I do however am a student in history. Im more particularily trying to establish the authenticity of an ancient story in which there is mention of a large wall made ...
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Last replied to by BATALEUR
This seems very crude of course but I don't see too many metallurgical issues with it although the strength of the wall and it's stability might be an issue. Assuming they were making cast iron it wou...
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Started by MrTMBjewelry
Hello, My wife and I have been in the jewelry industry for several years, from manufacturing, personalizing, packaging, website, branding, and marketing of our own company and line of jewelry. The ups and downs of our retail business have led me to...
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Last replied to by Dave Tahija
Manhattan Gold & Silver Buys a lot of jewelers sweeps and scrap: https://www.mgsrefining.com/gold-refining-process/    
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Started by vaheedghassemy
Hello all I want to add guar to electrolyte of copper and sulfuric acide then start to electrowinning but i dont knew how much add guar to electrolyte please help me. thanks
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Last replied to by rbtmiller0@gmail.com
Below link takes you to an article that indicates 240 g/t of cathode. It is a place to start. https://books.google.cl/books?id=qp0hWKleKwcC&pg=PA182&lpg=PA182&dq=goma+guar+electrowinning&source=bl&o...
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Started by vaheedghassemy
hello friends  I want to measure the concentration of copper in the electrolyte and PLS but i dont know how i can do that .please help me  thanks a lot
Last replied to by SmartDog
Your question can be answered several ways, depending on what you are actually looking for.  The basic topic is covered by metallurgical accounting, where generally recognized formula are used to mea...
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Started by ToddLaw
I've got a mine with sulfides in my ore. For reasons unrelated I haven't been running my ore for 22 years. I used to burn my ore with a Beckett oil burner in a contained environment and extract the output with water. The sulfides would ignite in the ...
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Last replied to by Siddiquf
ToddLaw, if your sulphide ore has been exposed to elements for 22 years, the sulphides may have been oxidized, at least on surface of each grain, and therefore may not be combustible any more irrespec...
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Started by DieselDave
I'm a micro miner and have zinc / silver ore, also has gold in arsenopyrite. I'm wondering how to micro scale extract the silver without froth flotation, arsenic?
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Last replied to by Jose Doneiber
Hello my dear friend. In Colombia there are argentiferous minerals and I have observed that the most indicated method is to first float the ore then leach it with cyanide, you can do it on a small sc...
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Started by sajjadaghazadeh
can someone help me with chunks problems in iron ore pellets in rotary kilns? thanks so much.
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Last replied to by RayMartin
What do you require to know?  Why they form? How to remove? I would need some ifnrmation about your process or plant.  
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Started by Cl.BrINHOF
While electrorefining in a CuSO4 electrolyte (Cu anode to SS blank) what are the roles of additives (thiourea, glue, salt) in relation to bubble formation? More specifically, is there any evidence to support the claim that the potential to create mor...
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Last commented on by Cl.BrINHOF
Thank you. I appreciate your response.
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Started by leonard
  how do you seperate fine gold loaded activated carbon from pulp?    
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Last replied to by rob riggir
Try coal flotation techniques as filtration will not work as both the pulp and carbon particle sizes will likely be similar. Cheers

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