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Author: Subject: Few questions about Gold recovery
Romix
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[*] posted on 17-6-2021 at 12:08
Few questions about Gold recovery


Here is gold after washing it with 20 litters of water.

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Romix
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[*] posted on 17-6-2021 at 12:09


No matter how much I wash it, solution still dirty. Why ?

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Romix
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[*] posted on 17-6-2021 at 12:11


And after dropping the Gold with Sodium Sulfite, I added KOH to the solution that's what precipitated. Any ideas what is it?
Solution still were lightly greenish after filtering it.
I've checked PH, basic.

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[Edited on 17-6-2021 by Romix]

[Edited on 17-6-2021 by Romix]

[Edited on 18-6-2021 by Romix]

[Edited on 18-6-2021 by Romix]
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paulll
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[*] posted on 17-6-2021 at 13:17


Any chance there's a bunch of iron in there?
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Romix
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[*] posted on 17-6-2021 at 13:38


Could be, I dissolved 8 ceramic processors + a lot of other gold containing scrap. Here's just 200ml tester.
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Romix
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[*] posted on 17-6-2021 at 13:39


That's how pure gold looks like, dropped it from dissolved Alaskan nuggets.


[Edited on 17-6-2021 by Romix]

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draculic acid69
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[*] posted on 17-6-2021 at 17:25


Did U just aqua regia the straight processors without first dissolving tramp metals?
Could you just wash the red goo with nitric acid to remove some of the crap?
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paulll
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[*] posted on 17-6-2021 at 17:31


Ooh that looks like it'd be satisfying to melt down.

I think you're carrying a lot of Iron and Nickel; I'd decant that off and treat the precipitate with successive HCl washes 'til it comes up clear, and take it from there.
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Romix
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[*] posted on 17-6-2021 at 17:33


I tried boiling it in 3% nitric first... but after an hour nothing happened.
So chucked in very diluted AR.
Yes, that's what I thought about doing. Just waiting for the wash solutions to settle down. And they still dirty after whole day standing.
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[*] posted on 17-6-2021 at 18:00


Quote: Originally posted by Romix  
I tried boiling it in 3% nitric first... but after an hour nothing happened.
So chucked in very diluted AR.
Yes, that's what I thought about doing. Just waiting for the wash solutions to settle down. And they still dirty after whole day standing.

It'll probably take a few goes-around but I'd put aside the nitric (Actually if I suspected there was any there I'd wash it out like a lipstick stain) and AR, and focus on dissolving everything that *isn't* Gold.
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Romix
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[*] posted on 17-6-2021 at 22:38


After boiling it in water, solution became clearer!
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[*] posted on 18-6-2021 at 00:56


Added nitric all dissolved!!!!!! No gold left!!!!

[Edited on 18-6-2021 by Romix]
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[*] posted on 18-6-2021 at 01:05


Solution is green.
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[*] posted on 18-6-2021 at 01:10


200ml lost, what to do with the rest of gold containing solution?
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Romix
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[*] posted on 18-6-2021 at 03:28


It took few seconds for all of it to dissolve, reaction was exothermic.
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[*] posted on 20-6-2021 at 13:55


Google saying that this yellow - orange precipitate is CuOH.


[Edited on 20-6-2021 by Romix]

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[*] posted on 20-6-2021 at 13:57


Could be, decomposed it to black oxide and flame test is green.


[Edited on 20-6-2021 by Romix]

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[*] posted on 21-6-2021 at 06:05


Cu(OH)2

[Edited on 21-6-2021 by Romix]

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