alexmaywood
Member
Last summer I tried to refine some pounds of ceramic processors, fingers and pins. It was something like 80 F. I made AR by adding of 1 Part of 31% Nitric Acid to 3 parts of 40% HCl. After I added the procs it started to fizz actively, so actively, that soon it was boiling over the top. Lot of brown fumes. The gold on procs was all "eaten". So I decided it was in the AR which stopped finally to boil and turned green. I added urea till it fizzed no more, then plenty of SMB. There was too decent amount of mood if any on the filter. Looked like gold was diappeared.
I made it once more with 2 lbs of pins. The same.
It was sadly enough, because earlier I made the same process under the same conditions. Adding Sodium Nitrate instead, all was perfectly. I ended up with 1 oz of gold.
I did not heat the solution. The first time it was active enough, so I did not see any need for heating. The second time it looked more like I needed to cool the whole process down.
Amazingly, because I read again and again the guys are using hotplate.
But what did I wrong on the second time?
I made it once more with 2 lbs of pins. The same.
It was sadly enough, because earlier I made the same process under the same conditions. Adding Sodium Nitrate instead, all was perfectly. I ended up with 1 oz of gold.
I did not heat the solution. The first time it was active enough, so I did not see any need for heating. The second time it looked more like I needed to cool the whole process down.
Amazingly, because I read again and again the guys are using hotplate.
But what did I wrong on the second time?