It settled as a brownish powder, but the acid is still a little cloudy. Tested with stannous and it showed a little color, so i think i will let it settle a little longer (it sat overnight) and try the smb again. I didn't have too much foils, maybe a teaspoon full when i started. I was expecting more of a reaction like in lazersteve's video and the gold as a black precipitant.
Curious though, i read that raising the ph of an acid solution causes all metals to precipitate out, couldnt you just add backing soda to the acid chlorine and cause the gold to come out instead of using smb?
The whole point of dissoving the gold was to further purify the impurities left from the acid peroxide stripping method, but i always seem to have problems with smb.
I mixed up a batch of aqua regia and dissolved some mother boards and memory chips down to bare plastic, which was per the instructions i recieved with the batch of chemicals i received from everyones favorite supplier, and ended up with a bright emerald green solution. Neutralized it with urea, ran it through a strainer to get all the trash out of it, then added storm to it and made a 5 gallon bucket of brownish black fluid. Tests possitve with stannous. After much reading on this forum i can see the error of my ways, as most of you selectively pick off the pieces with gold and discard the rest. I threw some scrap copper pipe into my bucket and i'm waiting to reclaim my gold as black powder.
Would it be quicker to just neutralize the whole thing with baking soda, or throw a chunk of aluminum in it and collect all the powder after it settles, then use either nitric acid or acid chlorine to clean the by products out of gold precipitant?
So far i like the acid peroxide method for fingers and terminals, but i will probably have to use AR for the chip sets and everything else.