Recovering values from borax slags
Dec 01, 2017· I use anhydrous borax as the flux when I melt, then remove the slag (frozen, dirty borax) from the bar. ... Being how it's silver it's a little different. How much slag are we talking? It takes a lot of silver to justify what processing it would take verses gold. With mine (gold) i just grind it in a pestle and run it through nitric acid to ...