Shipley have developed a process for this - the lead is electro-won and the tin is precipitated out as oxide (apparantly a very usefull polishing material!). In addition to PCB manufacture this provides a usefull route for tin/lead solder recycling during PCB dissasembly (or rework). David Whalley At 06:00 PM 4/17/99 +0800, you wrote: >Hello, technetters, > >Quite some of board shops sucessfully installed on line copper etchant >recycle. The technology is actually very mature. The next stop for on line >recycle is Tin stripper. > >Any ideas or do you run tin stripper recycle on line successfully? Please >share your experience with us. We are using nitric acid based stripper and >think how to take Tin out of the spent solution. We are using >precipitation tank treatment. Dialysis is one method but seems to be too >expensive for just recovering the inpensive nitric acid. > >Please share your case which is feasible and cost effective and good for >environment. > >################################################################ >TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c >################################################################ >To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: >To subscribe: SUBSCRIBE TechNet <your full name> >To unsubscribe: SIGNOFF TechNet >################################################################ >Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. >For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 >################################################################ > > > ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################