Precipitating gold out of Aqua Regia

[Owltech]

Hello . What is the best way to precipitate gold from aqua regia when palladium is also soluble in aqua regia?

Oxalic acid, sodium nitrite to name a few

 

[goldsilverpro]

In my experience, Ferrous sulfate, Copperas, is about the best to avoid much co-precipitation of PGMs. Follow the very complete instructions in the Hoke book.

 

[g_axelsson]

Some links for copperas... at the bottom of the page.
http://goldrefiningwiki.com/mediawiki/index.php/Copperas

Göran