archeonist
Well-known member
- Joined
- Jun 27, 2012
- Messages
- 286
Hi guys, I would like to share a little experiment on extracting gold from 15000 telephone cards. I know some of this has been done already (not in this amount I guess), and yields are also out there, but it is just for fun and I want to create a bit of realtime evidence on how low these yields probably will be.
All telephone cards are from 1994-2004 and each one was peeled off by hand :mrgreen: Because of the age of the cards the glue has been deteriorated so the chips popped right off.
The gold will be extracted using AP, for the foils, and pyrolising/incinerating the black epoxy dots on the back of each card for the bonding wires. I believe there are 8 bonding wires in each card so that would make a total of 15000 x 8 = 120000 bonding wires.
First I dissolved the residual glue using acetone. This was nessesary to prevent foils to stick on the glue in the AP step
The total weight of the chips was 1676 g
All telephone cards are from 1994-2004 and each one was peeled off by hand :mrgreen: Because of the age of the cards the glue has been deteriorated so the chips popped right off.
The gold will be extracted using AP, for the foils, and pyrolising/incinerating the black epoxy dots on the back of each card for the bonding wires. I believe there are 8 bonding wires in each card so that would make a total of 15000 x 8 = 120000 bonding wires.
First I dissolved the residual glue using acetone. This was nessesary to prevent foils to stick on the glue in the AP step
The total weight of the chips was 1676 g