Good Day my name is James Walker. I have seen several messages on the
internet where you have given good advice concerning gold recovery an I
wanted to ask for a little help for myself.  I am attempting to reclaim gold
from semiconductor manufacturing equipment spare parts.  I have constructed
a polypro tank that is heated ~123F and it also has a recirculation pump.  I
have mounted a electro winning cell in the above tank.  I recirculate a
cyanide solution (Technistrip-Au) through the winning cell (SS plates serve
as cathode and anode) that has a voltage set at about 5.6v @90 amps.  The
technistrip solution strips the gold OK, however when I attempt to reclaim
the gold thru the winning cell, I don't seem to get any deposition.  At the
start of the winning process the technistrip solution is yellowish, but
after running the winning cell the solution has turned a dark red (prune
juice).  I am assuming that the color change is due to cyanide destruction
via the winning cell.

Technistrip is a solution of potassium cyanide and oxidizers)

James Walker
Project Manager
Semicon Precision
214-951-0175
[email protected]