so basically,
I smelted (with Pb0) and cupeled some mixed PCB scrap
Then I did a nitric treatment on the dore, after that i did aqua regia on the residue left from the nitric treatment.
I tested the AR solution it was strongly positive for gold. so I precipitated the gold with smb
Then I left the gold powder to settle for a few hours.
After the gold settled down there was some white precipitate on top of it. I decanted the solution and took the gold into a melting dish but it won't melt instead it formed chunks like this.
I also checked one golden looking chunk with AR and stannous it was positive.
thnks.
Pardon my mistakes, English is not my first language
I smelted (with Pb0) and cupeled some mixed PCB scrap
Then I did a nitric treatment on the dore, after that i did aqua regia on the residue left from the nitric treatment.
I tested the AR solution it was strongly positive for gold. so I precipitated the gold with smb
Then I left the gold powder to settle for a few hours.
After the gold settled down there was some white precipitate on top of it. I decanted the solution and took the gold into a melting dish but it won't melt instead it formed chunks like this.
I also checked one golden looking chunk with AR and stannous it was positive.
thnks.
Pardon my mistakes, English is not my first language