Last edited by CyberNerd; 24th October 2011 at 04:05 PM.
After filtering the solids, the glassware was washed in aqua regia - I used about 100ml - but now think this was way too much, probably about 25ml would be better as i don't want the gold too dilute.
Then added a few grams of Urea
until it stopped fizzing:
Then added Sodium Metabisulphite - might have overdone it a bit, smell of sulphur dioxide was quite evident.
Anyway the solution turned black and there is a precipitate, grey/brown - this should be the gold. I scratched the bottom of the flask with a glass rod to promote nucleation on the glass and put it in the fridge next to the hydrogen peroxide and orange juice.
I'll leave it there for a bit then filter it.
Last edited by CyberNerd; 24th October 2011 at 04:06 PM.
You have to love Science fridges, one potentially dangerous liquid next to the orange juice or the utterly butterly.
My latest update: Not good news.
I think I may have added too much sodium metabisulphite. I collected the precipitate and it was a bit on the black side.
It should look like this:
File:Golddust.jpg - Wikipedia, the free encyclopedia
but I got this:
I'm guessing the excess metabisulphite caused other stuff (particularly copper) to precipitate with the gold.
I did a quick flame test and it went bright green, a sign for copper
I think I'll need to re-crystalise my mess from aqua regia again.
back to the drawing board, and won't have time to do it this week. Will post back if I come up with anything.
@CyberNerd Did you have any luck refining the extraction process?
Very interesting thread, and even despite the results I still think I'd rather send any actual gold to CyberNerd than Cash4Gold!
And I found it a bit funny (not to the detriment of the experiment) that as soon as Dos_Box said about purest green, lo and behold, we got green!
(Easily my favourite series of Blackadder - well, probably equal to 4)
Very interested to see how it goes. I used to work for a company that had the countries largest warehouse for automatically stripping down parts for the gold and copper contents. Never got to see that part of it work, but we usually kept the copper heatsinks for ourselves, flogged it to the scrappies (via electricians we knew) and used to get around £50 a month which kept us in decent tools and biscuits.
Did you know the mayans smelted copper with gold and even by Todays machinery it registers as pure gold!! Lol. The method got documented on how they did it. Look it up, might make it stretch further.
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