mlgdave said:
Ok, now you have me scared, Hoke is where I got the idea to begin with (or so i think?) Page 135 she talks about if you have gold with silver up to 12% to melt UP with another metal to get silver to less than 10%.........I did that, it digested in AR beautifully, its nice red color and I will treat with sulphuric to get rid of Pb and then dilute and precip............or do you still say I need to read Hoke?
<<chuckle!>>
Ok, I see where you're going with this one. There's two approaches, and inquartation tends to apply to the one I had in mind (quartering, or lowering gold content to 25%) by adding other metals, then digesting in nitric *
before* dissolving the values. That's the procedure I used (always) and preferred, for more than one reason. One of the good ones is that you remove base metals as well as most platinum and palladium in the process, leaving behind primarily high quality gold with just traces of silver, copper, zinc and pt. metals (assuming they are present).
I'm a little surprised at the resulting color of your solution (although I suspect the picture, above, is not from this lot of refining)----which should have a green tint, assuming you didn't do the preliminary nitric process. Is there something I missed? That was my concern at the outset--that you talked about melting, shotting and going straight to AR.
Harold
he added way more Au than necessary so going to AR worked quite well. He said Pt may have been present in the scrap so a copper pipe or buss bar is in order.
