I don't think much of the process you used, and there's good reason. Please understand that I refined for manufacturing jewelers almost exclusively, so I have considerable experience, in particular with processing polishing wastes and floor sweeps.asustin said:Hi everybody! thanks for yours comments. Let me tell you what I did since yesterday. first I burn one pound of jewelry dust that reduced the pound to 260 grams, then I added nitric acid, then I take out the acid to recover the silver later. today I added aqua regia and I'm waiting for tomorrow. What do you think about that?
Sounds like you had good fortune in filtering, so you did just fine.asustin said:Hi, thanks for your valuable information, will apply for the next occasion. Let me tell you the procedure I am carrying out. Today in the morning I filtered the aqua regia solution and I know there's a bit of platinum, so I added ammonium chloride to precipitate it. In the afternoon I filtered again and I recovered de sediments that I guess is platinum, and just now I'm going to add ferrous sulfate to precipitate the gold. Thanks for yours comments I really appreciate it.
That's part of the reason I suggested the preliminary wash in HCl instead of nitric. I used that method for years and NEVER had any issues with purity or with filtration. If the resulting dirt (from polishing wastes) is given a hard, prolonged boil, the resulting gold chloride solution is a very nice yellow color, without signs of copper or other base metals. I fully expect that's because of the incineration and finely divided nature of the material, where most of the base metal is oxidized and readily dissolved in HCl. As I said previously, the only real negative aspect is that silver is not recovered, although it's also not lost---it's still in the material, now as silver chloride.butcher said:Cementing on copper at this point, rinse and incinerate powders, a good boil in HCl and rinses, dilute hydroxide wash heated, rinse and then re-incinerate and start over, would be my choice, I think you have something in this that is just going to keep giving you trouble till you clean it up,
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