James,

On an semi-unrelated subject....my ESEM has EDS capability which can
point-map gold in the target.  If this is something that might be of
interest to you let me know.  I've coupled a video capture system to my ESEM
so that I can send the output to DVD, CD, or web accessible library file.
I'm now doing this as a service with delivery in as little as SAME DAY.
Darden

Darden Hood
MicroAnalytica, LLC
4989 SW 74 Court
Miami, Florida 33155
Tel: 305 479 1259
Fax: 305 675 2205
[email protected]
www.videoEM.com
----- Original Message -----
From: James Walker 
To: 
Sent: Thursday, February 06, 2003 7:31 AM
Subject: [mems-talk] Cyanide Gold Electro winning Recovery


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]


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