Beginner lee
Member
- Joined
- Dec 28, 2016
- Messages
- 11
HI,
I do have some high grade gold coated screw where the nitric acid cannot attack the base metal.
My first sample was done by direct dissolve in AR, where the AR mix only little HCL for the gold coated to dissolve and expose the base metal, next, I keep adding nitric to dissolve base, when the nitric is saturated, the base metal dissolve will push the gold where dissolve early to come out, so , I filter off the gold foil and the gold particle and refining it again.
The AR which more in nitric believe is saturated, and I add SMB to try precipitate any gold left in it.
Is this produce prefect? Is there any better work flow to deal with this high grade screw / pin where nitric acid cannot attack the base metal behind the gold coating.
Appreciate any comment and ideal.
Thanks
I do have some high grade gold coated screw where the nitric acid cannot attack the base metal.
My first sample was done by direct dissolve in AR, where the AR mix only little HCL for the gold coated to dissolve and expose the base metal, next, I keep adding nitric to dissolve base, when the nitric is saturated, the base metal dissolve will push the gold where dissolve early to come out, so , I filter off the gold foil and the gold particle and refining it again.
The AR which more in nitric believe is saturated, and I add SMB to try precipitate any gold left in it.
Is this produce prefect? Is there any better work flow to deal with this high grade screw / pin where nitric acid cannot attack the base metal behind the gold coating.
Appreciate any comment and ideal.
Thanks