Hi all,
I am new to refining. Would be glad someone could enlighten me. My project is gold pins from various motherboards, ide pins, etc..
I encountered problems during first step of removing the base metals using technical grade nitric acid 68%.
I do not know whats the problem, it seems taking me quite a long time to removing all base metals using boiling methods.
I suspect i mis calculate the 50/50 rule, and end up using more nitric then water. Nevertheless i experience myself to just continue boiling method, till the solution is quite thick. But after stiring, i see that those pins has became brownish without gold anymore. But it just couldnt eat away those metals. I gave up. I put it aside and filter away the pins and gold sands. After filtering by keep adding water till the gold sand settles. I found that quite a large sum of whitish/greyish powder or salt mixing togethe with the gold sands.
Now my question is, is it the problem of excess nitric? Or...? I missing a step?
Please kindly advise! Thanks alot!
I am new to refining. Would be glad someone could enlighten me. My project is gold pins from various motherboards, ide pins, etc..
I encountered problems during first step of removing the base metals using technical grade nitric acid 68%.
I do not know whats the problem, it seems taking me quite a long time to removing all base metals using boiling methods.
I suspect i mis calculate the 50/50 rule, and end up using more nitric then water. Nevertheless i experience myself to just continue boiling method, till the solution is quite thick. But after stiring, i see that those pins has became brownish without gold anymore. But it just couldnt eat away those metals. I gave up. I put it aside and filter away the pins and gold sands. After filtering by keep adding water till the gold sand settles. I found that quite a large sum of whitish/greyish powder or salt mixing togethe with the gold sands.
Now my question is, is it the problem of excess nitric? Or...? I missing a step?
Please kindly advise! Thanks alot!