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Topic: extracting gold, silver and platinum with aqua regia  (Read 14449 times)

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Offline marika

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extracting gold, silver and platinum with aqua regia
« on: November 13, 2009, 11:04:43 AM »
once these metals are disolved in aqua regia, how do i get the various metals back?

Offline Borek

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Re: extracting gold, silver and platinum with aqua regia
« Reply #1 on: November 13, 2009, 11:32:17 AM »
They were dissolved by oxidation, they can be precipitated by reduction.
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Offline marika

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Re: extracting gold, silver and platinum with aqua regia
« Reply #2 on: November 13, 2009, 01:08:15 PM »
Ok. All I know about chemistry is what I have read about the subject. I need to have a more specific answer. thank you.

Offline Borek

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Re: extracting gold, silver and platinum with aqua regia
« Reply #3 on: November 13, 2009, 02:00:46 PM »
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.
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info

Offline marika

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Re: extracting gold, silver and platinum with aqua regia
« Reply #4 on: November 15, 2009, 11:01:51 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  ???

Offline marc

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Re: extracting gold, silver and platinum with aqua regia
« Reply #5 on: November 20, 2009, 05:10:05 PM »
Are you actually doing this?

Offline kore

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Re: extracting gold, silver and platinum with aqua regia
« Reply #6 on: January 19, 2010, 01:09:24 PM »
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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