Hello,
So I process 1Kg of DDR2/3 RAM sticks (ICs + trimmed fingers) using AR & I melted the acquired gold dust into this small 1.25g button. I had done AR twice, once to drop gold and once to refine/purify it.
However this button is not pure gold since its color makes it obvious (very dull and not golden like pure gold);
I wanted to purify this, so I did AR on this button (not premix, added nitric drop by drop) with small applied heat in a beaker, to my surprise, the button dissolves just a bit and then a black layer envelopes it, preventing further reaction. This black layer can be peeled off easily, it is very flaky and weighs nothing. here is an image of that layer;
Now I am unable to dissolve it fully without stopping reaction every 10 minutes and taking it out, peeling off layer and placing back in.
I need some help here to purify it, whats going on? TIA
So I process 1Kg of DDR2/3 RAM sticks (ICs + trimmed fingers) using AR & I melted the acquired gold dust into this small 1.25g button. I had done AR twice, once to drop gold and once to refine/purify it.
However this button is not pure gold since its color makes it obvious (very dull and not golden like pure gold);
I wanted to purify this, so I did AR on this button (not premix, added nitric drop by drop) with small applied heat in a beaker, to my surprise, the button dissolves just a bit and then a black layer envelopes it, preventing further reaction. This black layer can be peeled off easily, it is very flaky and weighs nothing. here is an image of that layer;
Now I am unable to dissolve it fully without stopping reaction every 10 minutes and taking it out, peeling off layer and placing back in.
I need some help here to purify it, whats going on? TIA