In House Dross Recovery- Do You Know What You Are Putting Back in Your Solder Bath?Authors: Mitch Holtzer and Jason Fullerton
Date Published: 9/27/2015 Conference: SMTA International
In this process, small ingots of solder are produced by using pressure to separate liquid metal from the oxide/metal mixture skimmed from the solder bath. After the entrapped metal is removed, the remaining oxides are returned to solder suppliers for further recovery. Analysis of these ingots show that there is a significant change in the ratio of tin/silver in SAC alloys, and the ratio of tin/lead in Sn63 alloys. This means that the ratio of tin to silver and tin to lead may be changing in the wave or selective soldering pots.
Analysis of the amount of dross included in the ingots produced using this method was compared to a number of commercially available brands of bar solder. Data indicates that the lack of post treatment of this recycled material results in an order of magnitude increase in the amount of included dross.
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