George,
If KSCN won't strip gold then why the abstract below and why does ECI has a KSCN process for use with the SERA tester?
Bev
RIM
O.N. Kononovaa, , , A.G. Kholmogorovb, N.V. Danilenkoa, S.V. Kachina, Y.S. Kononovb and Zh.V. Dmitrievaa
aDepartment of Chemistry, Krasnoyarsk State University, Svobodny Pr. 79, 660041 Krasnoyarsk, Russia
bInstitute of Chemistry and Chemical Technology, Siberian Department of Russian Academy of Science, Karl Marx Pr. 42, 660049 Krasnoyarsk, Russia
Received 27 November 2003; accepted 16 August 2004. Available online 5 October 2004.
Abstract
Sorption recovery of thiocyanate gold and silver complexes on different carbon adsorbents has been studied using model solutions with concentrations 0.08-0.82 mmol/l and 0.16-1.06 mmol/l for gold and silver, respectively. The potassium thiocyanate concentration in these solutions was 0.25 mol/l and the pH of the contacting solution was 2. The degree of recovery exceeded 90% for gold and 80% for silver. The separate step-by-step desorption of thiocyanate gold and silver complexes was carried out by varying the initial concentration of thiocarbamide (desorption agent). The degree of recovery of noble metals can be increased up to 95% using basic thiocarbamide solutions (in 0.1-0.2 M NaOH) at the higher temperature of the process (up to 150 °C).
Keywords: A. Activated Carbon; B. Chemical treatment; C. Adsorption; D. Adsorption properties
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of George Milad
Sent: Friday, June 29, 2007 2:20 PM
To: [log in to unmask]
Subject: [TN]
I agree with Bev's first statement..
If you are going to destruct the part anyway, then stripping the gold and
examining the nickel surface would be the easiest and most effective way to make
your determination.
Potassium Thiocyanate will not strip gold, for that you will need potassium
cyanide.
There are specific formulations to do this safely.
Regards
George Milad
George Milad
National Accounts Manager for Technology
Uyemura International Corp (UIC)
249 Town Line Rd
Southington CT 06489
[log in to unmask]
Cell: (516) 901 3874
************************************** See what's free at http://www.aol.com.
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
---------------------------------------------------------------------
This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful.
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
