Not sure if this is the right area to post this or not- feel free to move it where it belongs if this is not correct
I started with a 20-22kt yellow gold bangle bracelet - I melted it and rolled it out thin -
in my hood , I put it in a beaker with HCL and added Nitric acid slowly bit by bit - according to the formula for AR to drop the assumed amount of pure Au I needed 128 ml of HCL and about 25ml and change of Nitric
I didnt use the full above amounts- the gold went into solution and was golden color. But at the bottom of the flask there was fine white granules, I had not seen this before - I then later added a few drops of Sulfuric .
Here is where I made mistakes -
I added ice and then filtered the solution in a buchner filter-
After the filtering- I added sulfamic and since the solution was cold the sulfamic did not react- no fizzing
I added SMB and there was fizzing - there was no end to the fizzing so I stopped - then I decided to add sulfamic again and there was more fizzing and after a while strong sulphur smell.
To make a long story short Im sure I over added SMB and Sulfamic and did not expell the notric like I had thought I had. -
I have the mix in a beaker with added water and tested the solution near the top with stannous and no indication of gold in it-
Here is what I am thinking about doing-
1. Siphon off the solution , check it again with stannous
2. Once siphoned off and no gold in solution then add HCL to it and small amounts of Nitric to put the gold back into solution
3. add a pure gold button known weight and then leave to ensure all the free nitric is used up
4. filter it with the buchner set up
5. if solution is crystal clear then add smb while stirring
Doe this make sense as I want to put the dropped gold back into solution and drop again but I want to leave the sulfamic and extra SMB behind
I want to avoid another mix up on my part- so please advise -
Normally I do inquarte but this time I decided to go AR and do a drop - I hurried and this is what happens when you do
;(
I have the white granules on the filter paper- what could they be if they were left in the beaker after the AR put the gold into solution but not these ?
Thanks in advance
GOG
I started with a 20-22kt yellow gold bangle bracelet - I melted it and rolled it out thin -
in my hood , I put it in a beaker with HCL and added Nitric acid slowly bit by bit - according to the formula for AR to drop the assumed amount of pure Au I needed 128 ml of HCL and about 25ml and change of Nitric
I didnt use the full above amounts- the gold went into solution and was golden color. But at the bottom of the flask there was fine white granules, I had not seen this before - I then later added a few drops of Sulfuric .
Here is where I made mistakes -
I added ice and then filtered the solution in a buchner filter-
After the filtering- I added sulfamic and since the solution was cold the sulfamic did not react- no fizzing
I added SMB and there was fizzing - there was no end to the fizzing so I stopped - then I decided to add sulfamic again and there was more fizzing and after a while strong sulphur smell.
To make a long story short Im sure I over added SMB and Sulfamic and did not expell the notric like I had thought I had. -
I have the mix in a beaker with added water and tested the solution near the top with stannous and no indication of gold in it-
Here is what I am thinking about doing-
1. Siphon off the solution , check it again with stannous
2. Once siphoned off and no gold in solution then add HCL to it and small amounts of Nitric to put the gold back into solution
3. add a pure gold button known weight and then leave to ensure all the free nitric is used up
4. filter it with the buchner set up
5. if solution is crystal clear then add smb while stirring
Doe this make sense as I want to put the dropped gold back into solution and drop again but I want to leave the sulfamic and extra SMB behind
I want to avoid another mix up on my part- so please advise -
Normally I do inquarte but this time I decided to go AR and do a drop - I hurried and this is what happens when you do
;(
I have the white granules on the filter paper- what could they be if they were left in the beaker after the AR put the gold into solution but not these ?
Thanks in advance
GOG