Instructables

Step 11: Recovering your gold.

Picture of Recovering your gold.
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Recovering your gold in solution is one of the Coolest steps.

Whats needed,  a plastic spoon, and the sodium Bisulfate or Stumpout.

Simply add very small amounts of stumpout,   Your Mixture should start to look like the pictures I have provided. This is caused by the SO2 Gas which acts to chemically displace the gold in solution.

When the reaction has finished you will have driven out a majority of the chlorine, and replaced it with Sulfur.  Any gold which was trapped in the solution has now be come a brown precipitate at the bottom of your beaker.

Retest with Stannous chloride, if your reaction still turns purple you need to add more stumpout.

It will take appox 10 hours for the gold to competely settle,  the solution should be clear at this point.
 
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Powersb1 year ago
Really interesting procedure (never seen anything like this). Can you use the same procedure for pins containing gold? Can I use potassium metabisulfite instead of sodium Bisulfite (i cant find any)?
num1bandit Powersb11 months ago
sodium bisulfite aka baking soda right?
Railes (author)  num1bandit11 months ago
no baking soda is calcium carbonate. and yes you can use pottassium metabisulfite.
num1bandit Railes11 months ago
aka ph down?
Railes (author)  Powersb1 year ago
That shouldnt be an issue. Instead of creating sodium chloride. You would create potassium chloride the resulting exchance. Should create so2 gas. Lol give it a try, just dont hold your face over the beaker if you added distilled water ..
i forgot to add if you left the gold bearing acid outside like overnight and didnt do anything with it would the gold clump together by itself.
i would stir it up and then add it watching and waiting and try again that is what i do, don/t give up
Railes (author)  num1bandit11 months ago
eventually, but would take days, and lots of sunlight
num1bandit Railes11 months ago


railes we followed you step bye step process and the got a gray looking powder on bottom can you tell why?
is there any chance that the gold would clump together with out adding the stumpout to the last bath?
Railes (author)  xxx_mox_xxx1 year ago
Copper will because the bond is simply ionic, where gold forms a covalent bond which is stronger, and why a selective displacement is used to recover it.