Warning! This video is intended for demonstration purposes only! Trying to
duplicate the shown procedures may result in serious injury or even death!
HI! In this video I will recover the gold from 2.6 kilograms ELSAG memory boards
the boards are placed in large stainless steel vessel
adding about 200 grams citric acid
enough water is added to cover the boards
dilute nitric acid is added
on the next day...
the solder is removed
the solution is replaced with fresh diluted nitric acid
on the next day the base metals were dissolved and the gold foils detached
the solution is filtered
the foils are collected in a beaker and washed with water five times
foils are washed with hydrochloric acid
after the washes I added fresh hydrochloric acid followed by nitric
acid addition
adding nitric acid
solution is de-NOxed using sulphamic acid
filtration
Gold precipitation with SMB
the gold is moved to a small beaker and boiled with concentrated hydrochloric
acid couple of times followed by water washes
the gold powder is moved to a melting dish and melted
I'm very pleased with the result 6.1 grams pure gold from 2.6 kilograms
boards
Thanks for watching!
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