EurekaNach
Member
- Joined
- Aug 11, 2019
- Messages
- 9
Hello guys I wanted to show you guys the gold I recovered from a batch of fingers and ask your opinion about the method I used and any tips on going from gold powder to a gold pebble.
I took a batch of 29 g of closely trimmed fingers from various sources and put them in some diluted nitric for a couple of days and then scraped off all of the gold with some tweezers, I then filtered it and let it soak in some clean diluted nitric overnight. After pouring the nitric it soaked in into the stock pot I prepared 200 ml of AR and dissolved the gold flakes in it, when it was done dissolving I heated it to around 50 °C and let it simmer for an hour.
https://imgur.com/Fp2OBKj
https://imgur.com/TlwuvVV
I then tried 3 things. 1) cementing with zinc , 2) adding Sodium Bisulfate, 3) Both. Zinc seemed to work best and Im not really sure what happened with option 3, I think i made some kind of zinc salt, so I cemented the rest with zinc and cleaned the precipitate with hot water, nitric, and water again.
https://imgur.com/m5Mvx5U
So I would like your opinions, I have learned a lot here in the forum and reading the recommended books but since its my first time I would love to hear you comments about what I might have done wrong.
PS:Im a Chemical Engineer and am pretty decent in the lab safety wise, all of this was done in a ventilated area (not my living space) with protective equipment. The images were too big, ill resize them tomorrow and attatch them as images
I took a batch of 29 g of closely trimmed fingers from various sources and put them in some diluted nitric for a couple of days and then scraped off all of the gold with some tweezers, I then filtered it and let it soak in some clean diluted nitric overnight. After pouring the nitric it soaked in into the stock pot I prepared 200 ml of AR and dissolved the gold flakes in it, when it was done dissolving I heated it to around 50 °C and let it simmer for an hour.
https://imgur.com/Fp2OBKj
https://imgur.com/TlwuvVV
I then tried 3 things. 1) cementing with zinc , 2) adding Sodium Bisulfate, 3) Both. Zinc seemed to work best and Im not really sure what happened with option 3, I think i made some kind of zinc salt, so I cemented the rest with zinc and cleaned the precipitate with hot water, nitric, and water again.
https://imgur.com/m5Mvx5U
So I would like your opinions, I have learned a lot here in the forum and reading the recommended books but since its my first time I would love to hear you comments about what I might have done wrong.
PS:Im a Chemical Engineer and am pretty decent in the lab safety wise, all of this was done in a ventilated area (not my living space) with protective equipment. The images were too big, ill resize them tomorrow and attatch them as images