I have some fingers that I know are higher yield. I wanted to determine yield per card.
I dissolved base metals with nitric acid. Removed and washed fingers. Decanted off excess liquid.
Added hcl, knowing I still had a small amount of active nitric. Started stirring with magnetic bar. Nothing. Added 1 ml of nitric. Nothing.
Knowing my hcl was old, I figured it had lost a bit of chlorine. I added more. Some gold went in to solution then stopped.
No problem...I can pick up more hcl Monday. I added more of the weak junk. Some more went in to solution.
Well, after a while I had more than 200 ml total solution for just some foils. I said the hell with it. Turned off the stir bar.
Immediately upon solution coming to a rest all the remaining gold went in to solution.
So why does stirring the solution keep it from dissolving?
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I dissolved base metals with nitric acid. Removed and washed fingers. Decanted off excess liquid.
Added hcl, knowing I still had a small amount of active nitric. Started stirring with magnetic bar. Nothing. Added 1 ml of nitric. Nothing.
Knowing my hcl was old, I figured it had lost a bit of chlorine. I added more. Some gold went in to solution then stopped.
No problem...I can pick up more hcl Monday. I added more of the weak junk. Some more went in to solution.
Well, after a while I had more than 200 ml total solution for just some foils. I said the hell with it. Turned off the stir bar.
Immediately upon solution coming to a rest all the remaining gold went in to solution.
So why does stirring the solution keep it from dissolving?
Sent from my iPhone using Tapatalk