Non-Chemical Ammonia rinse question

[Rag and Bone]

I'm finishing a batch of Pentium Pros in AP. I encountered some silver chloride. Will the standard 1 rinse with ammonia remove it?

I normally do 1 ammonia rinse even when no silver is present. This is the first time I have seen silver chloride.

 

[lazersteve]

Rags,

To be 100% sure it's not copper I chloride your are seeing add some full strength HCl and see if the white sludge dissolves into a green/ brown solution. If so its not silver chloride, but copper chloride.

If it is silver chloride you can simply dissolve the gold foils with HCl-Cl and it should leave the silver chloride behind.

Diluting the resulting auric chloride solution with a little water should remove any silver chloride that was carried over with the strong acid in the HCl-Cl.

Finish up with by evaporating the added water and then add SMB as usual.

Steve

 

[Lino1406]

May make 99.5% gold instead of 99%
even if you don't see the silver chloride

 

[Rag and Bone]

I dissolved twice in HCl-CL and did the full wash routine. The yield looks like less than I expected but that's what I get for trying to rush the process.