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Author Topic: extracting gold, silver and platinum with aqua regia  (Read 9863 times)

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marika

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extracting gold, silver and platinum with aqua regia
« on: November 13, 2009, 05:04:43 AM »

once these metals are disolved in aqua regia, how do i get the various metals back?
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Borek

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Re: extracting gold, silver and platinum with aqua regia
« Reply #1 on: November 13, 2009, 05:32:17 AM »

They were dissolved by oxidation, they can be precipitated by reduction.
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marika

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Re: extracting gold, silver and platinum with aqua regia
« Reply #2 on: November 13, 2009, 07:08:15 AM »

Ok. All I know about chemistry is what I have read about the subject. I need to have a more specific answer. thank you.
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Borek

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Re: extracting gold, silver and platinum with aqua regia
« Reply #3 on: November 13, 2009, 08:00:46 AM »

That will require more specific question, as there are many possible ways of dealing with the problem. Adding almost any reducing agent to the solution should preciptate noble metals.
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marika

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Re: extracting gold, silver and platinum with aqua regia
« Reply #4 on: November 15, 2009, 05:01:51 AM »

 :)ok. lets say i want to get the platinum out of the mixture. how do i do that.

and the silver. i have heard that the liquid should be dried out over low heat, then the silver forms a "crystal"? is that so?

thank you very much  ???
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marc

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Re: extracting gold, silver and platinum with aqua regia
« Reply #5 on: November 20, 2009, 11:10:05 AM »

Are you actually doing this?
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kore

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Re: extracting gold, silver and platinum with aqua regia
« Reply #6 on: January 19, 2010, 07:09:24 AM »

As far as Gold....

Once you have used the aqua regia on the gold and the process is complete.

The excess nitric acid must be neutralized with urea to  PH 1 +/- 0.4 then drop the gold with SMB.

* SMB - Sodium Meta Bisulfite plus water = 28.3 grams sodium meta bisulfite, 240 ml H20.

William
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