Stannous Chloride innefective at higher valences?

[NuggetHuntingFool]

I had a conversation today and was alluded to the fact that Stannous Chloride is or can be totally useless if the PM's are found in higher valences. I won't mention names but would love to hear more about this.

Does anybody have more information about this topic? It's really interesting to know that PM's can be completely overlooked because of these things.


Can somebody explain what this means from a recovery perspective and how to take precautions against it? Perhaps even adding some examples would be really helpful.

I'm no chemist so... :-/


Thanks!

 

[Lou]

Well...


We deal with gold in +3 valence.
Ex: HAuCl4, AuCl3, Au(CN)2-
We deal with platinum and palladium in +4 valence.
Ex: (NH4)2PtCl6 or H2PdCl6

Rhodium is almost (99%) always +3 as well in aqueous conditions.

http://webelements.com/gold/compounds.html

http://webelements.com/platinum/compounds.html

my point being here that unless you're doing really special things with it, you're not going to have Au(V) or Au(I), let alone Pt(V). I just wouldn't worry about it if I were you.

 

[NuggetHuntingFool]

Interesting Site.

Thanks.