Question for Lino1406.
After ashing the activated carbon filter used for the NaCn leach, was left with a grey powder, I then used a weak hot sulfuric acid to clean out any base metals. Then after rinsing and roasting the grey powder turned brown.
Now the brown powder is in an acid peroxide leach and the liquor has the color of palladium, tomorrow I'll make up some fresh stannous.
What I'm most curious about is why the gray powder turned brown after roasting.
After ashing the activated carbon filter used for the NaCn leach, was left with a grey powder, I then used a weak hot sulfuric acid to clean out any base metals. Then after rinsing and roasting the grey powder turned brown.
Now the brown powder is in an acid peroxide leach and the liquor has the color of palladium, tomorrow I'll make up some fresh stannous.
What I'm most curious about is why the gray powder turned brown after roasting.