How do you not understand? If FeSO4 is used as a reductant in an attempt to reduce gold from a metal solution, will it also pull into the powder the base metals in addition to the precious metals or only the gold or only the precious metals? What can FeSO4 reduce from a metal solution?
Recovering gold with Zinc
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Ferrous sulphate is fairly selective but it can precipitate some platinum if there’s a lot in the solution and with dirty solutions you can have some drag down of other metals which can be removed by boiling the precipitate in HCl until it’s colourless followed by boiling in water.
Reread your question, it did not say so. Ferrous Sulfate is relatively specific for Gold.
Please, now you explain to me what means -Ferrous Sulfate is relatively specific for Gold.
I had problems with this procedure since I work with chlorine. I guess I should boil first, but how much in the water to completely clean the chlorine or in some other way and only then add HCl because the mixture of chlorine and HCL dissolves all precious metals. More precisely, only a strong concentration of chlorine at higher temperatures dissolves them. It happened to me that when cleaning the powder, everything turned back into a liquid state.
And thank you for your reply.
That means that it is relatively selective to Gold.
It will not drop much base metals under normal circumstances.
Though I prefer SMB
Great, thank you.
Ayham Hafez
Well-known member
I make google search about zinc anode from zinc carbon batteries, got no information about how its made, is it zinc alloy or pure zinc, anyone have experience with it with precipitation PM's from acidic and alkaline solutions?
In my country I have no resource for pure zinc sheets, and the zinc powder that usually I got from gold market (Chinese origin) its make a very fine powder when precipitating PM's that make them take long time to settle down, and I noticed that the zinc powder is not pure zinc, it has some components that prevent it from getting fire as I read, as I also noticed that HCl not dissolve all the zinc powder some zinc powder elements not dissolved at all even with aqua regia and most of them float at the top of the solution and settle down very slowly, I think its an organic components but at the end they have weight and make issues when trying to make proper solution quantity for recovering Platinum group metals.
In my country I have no resource for pure zinc sheets, and the zinc powder that usually I got from gold market (Chinese origin) its make a very fine powder when precipitating PM's that make them take long time to settle down, and I noticed that the zinc powder is not pure zinc, it has some components that prevent it from getting fire as I read, as I also noticed that HCl not dissolve all the zinc powder some zinc powder elements not dissolved at all even with aqua regia and most of them float at the top of the solution and settle down very slowly, I think its an organic components but at the end they have weight and make issues when trying to make proper solution quantity for recovering Platinum group metals.
Zinc used in Batteries need to pretty pure to not pollute the reaction.
It may or may not have stabilizers in it.
Do you have access to a shipyard?
They use pure Zinc anodes to protect the hull from rusting too fast.
Anyway the best option is Copper as always, since Zinc drops most every thing.
Or if it is pure PGM solution, use Aluminum strips from sheet or foil.
Ayham Hafez
Well-known member
It's pur PGM solution,copper take long time, I was thinking in Aluminum buy read an article here talking about Aluminum cons in precipitation
Zinc is good for pure solutions, but it may be hard to get.
Aluminum is equally good, but need a bit more attention with respect to amount added and maybe retention time.
Of course it can not be used in Nitrate solutions.
Even pure Iron can be used if the solution is Copper free.
Ayham Hafez
Well-known member
You as usual inspired me again, I think iron sheet used in copper transformers are very pure, isn't it? One more question, is iron precipitation is fast and gave large PGM's sediments like zinc sheets?
*Edited for spelling
Last edited:
I have never used it, but it will be imperative that it is pure.
I didn't make it as I promised, but I didn't give up... when I do as Yggdrasil said, I'll contact you
You may be able to get these at your local hardware store. I've had good luck with these cementing out PGM's. Just remember to remove the steel parts. I get the 25 count container which is usually cheaper than buying them individually.
https://www.lowes.com/pd/Sigma-Elec...ce-Entrance-Connector-Conduit-Fitting/1087351
Or...your local boating store may have zinc anodes. But I can't say whether they are pure zinc or an alloy.
Ayham Hafez
Well-known member
Access denied to the shared link
Sorry, I must have done something wrong.
Google:
Sigma ProConnex 1-in Die Cast Zinc Clamp-on Type Service Entrance Connector Conduit Fittings
The link worked for me. I suspect it may be an accessibility issue in your part of the world. I occasionally have issues accessing North American websites when in some countries in Europe.
Bongo-ognob
Member
You can source pure zinc from Pennie’s after 1983 by heating with a torch and flicking the insides into a dish. From
There if you’re motivated collect enough to put into a casserole heat it till you can crush it into a Powder. If you use big pieces it will but might take a few hours
There if you’re motivated collect enough to put into a casserole heat it till you can crush it into a Powder. If you use big pieces it will but might take a few hours
Bongo-ognob
Member
I personally can’t drop gold with zinc atm but at least it’s kinda fun to do
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