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Romix
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This black mud of the walls turning yellow so not gold...
[Edited on 27-6-2021 by Romix]
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Romix
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Iron(II) sulfate best precipitant from dirty solutions, all gold dropped out in seconds!!
[Edited on 28-10-2021 by Romix]
 
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Romix
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Dirty, because I didn't filter Iron(II) sulfate before the precipitation.
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Romix
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ALSO toxic gases not coming off.
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Romix
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Had an accident, lucky 5 liter PET bottle was standing in a bath, and all concentrated slightly basic KNO3 escaped in to the drain.
KNO3 crystalized out nicely out of it. Had a go crystalizing it before I went to bed and situation above happened.
Very very very diluted KOH ate a crack at the button of the PET bottle. Now I'll use HDPE canister instead.
That shows that KOH is a much stronger base then NaOH. Was boiling PET in NaOH for hours and only yielded 1 gram of terephthalic acid at the end.
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Romix
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Also bases like NaOH and KOH eats glass too... Once had a jar standing with galvanized with zinc steel bits...
And it ate a crack in that too and leaked out. It's ok to filter something quickly in a borosilicate, but not boiling it in it.
What for? I think I was recovering zinc with aluminium from basic complex.
Unfortunately not tried melting this zinc because of the accident.
Might melt might not. For example tin recovered from chloride salt not melting.
[Edited on 30-10-2021 by Romix]
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Romix
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Ammonia solution much weaker base, stood in PET bottle with a nickel coin in for years with out any cracks.
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Romix
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What about recovering Tin with electrolysis, is Chlorine coming off? You'll need to make a set up to use it some where else in a different reaction.
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Romix
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Lucky, found two good lenses!! Usually you get short and thin 16 bonding wires on a lenses. Here you get that much only on one side of lens. And
there's 3 more sides like that. And wires are longer and thicker.
 
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Romix
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Romix
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Bought few canisters of MAPP+ gas and a torch that goes on it.
Yes. it's definitely Gold with some rust!
FeSO4 is the best precipitant of Gold from dirty solutions, copper and nickel stays behind in solution and not preventing the precipitation of Gold.
Maybe other Cations too. But solder needs to be removed first before you go removing the gold flake.
Copper Nitrate is a good remover of solder, last time I've done it, made it slightly acidic, all tin from solder left solution as Stannic acid and I
didn't see any copper metal displacing on tin. So I think Copper Nitrate can be used over and over again.
When I've finished, dropped mostly everything out of solution with KOH, but then I got bored watching basic KNO3 solution filtering and I went to bed,
When I woke up I found a fat crack at the bottom of 5L PET bottle eaten by one tablespoon past neutral PH of base. All my precious solution of KNO3
escaped in to the drain, lucky I've left it standing in a bath, Next time I'll do that will use HDPE canister instead of PET.
[Edited on 23-8-2023 by Romix]
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Romix
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I think that SMB is cut with oxygen NaSO3, to make the weight of the molecule heavier.
Them two reagents are good for precipitation of pure gold, clean gold flake of the PCBs, natural nuggets, low carat jewelry with the base metal
removed, pure bars. But when solution is contaminated with half of the Periodic Table, better to use FeSO4. Other cations in the solution preventing
SO2 to precipitate gold, instead a lot of blood red substance precipitates.
[Edited on 23-8-2023 by Romix]
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