from your cell I would have rinsed the powders well hot water wash's, then heated them on high heat (>700 deg) to drive off any remaining acids, then disolved powders in nitric acid 50/50 solution, this should dissolve the silver copper brass basically the base metals and pallladium can also disolve in nitric, this will not disolve the gold or other PGM's, letting this powder settle well and remove liquid (if silver and pallidium can be recovered from this liquid, of coarse not every bit of base metals will magically disapear but most will be removed with nitric, now you can use aqua regia, all metals must be disolved, but do not use more acid than it takes to disolve them, once disolved let settle decant solution of values, could use urea ( no fizz when warm PH>1), but if you haven't got practice with urea it can be tricky, boiling off nitric is usually better in my opinion, and if you didn't use more nitric than you needed would be simple, boil down solution to concentrate almost syrup, but not till crystals form, wet solution with a small amount of HCl, boil down again, wet Hcl, boil down again this last time add a few drops of sulfuric acid and boil little , add water till solution is three time its volume or more, let sit at least over night, if nitric did not get all of the silver or lead you will see them form in this solution(lead and silver chloride can be seperated in boiling water later), decant or pour off liguid filter, now that you have gotton rid of nitric you can precipitate the gold, you can make ferrous sulfate or buy sodium metabisulfite SMB, or use one of other chemicals to bring your gold out of this solution as a brown powder, this gold powder will need a good washing (see Harolds technique), and reprocessed again in aqua regia for a very fine gold. if you had platinum in solution solution would need concentrated ,then you can use ammonium chloride to precipitate PT. if palladium use sodium chlorate to precipitate the Pd.
since your solution is green you have copper and or nickel in it now, if mainly gold is a yellow solution.
hope this helps you and i didnt leave out some thing here,
edited: sodium chlorate to precipitate palladium (not table salt NaCl), mitake caught by sharp eye of platdigger thanks.
since your solution is green you have copper and or nickel in it now, if mainly gold is a yellow solution.
hope this helps you and i didnt leave out some thing here,
edited: sodium chlorate to precipitate palladium (not table salt NaCl), mitake caught by sharp eye of platdigger thanks.
