As Master Nater says, you need to test with Stannous.Hello Every one i hope you doing great i have Gold residue from the polishing process i dissolve it in AR and precipitate it with smb but i don't know if need to add more smb to the solution what i should do in this case
i have tried the stannous test but i don't know exactly the gold amount in the solution my question is if i add more SMB then needed what will happen when i put the gold for melting ? this is my first time doing this process. does the smb effect the gold ?have you tried a stannous test? it will let you know if you still have PMs in solution, or if they have all been precipitated out.
i have about 2.5kg of gold dust from polishing machine the gold is 18k i dissolve the gold with aqua regia immediately and add SMB for recover the gold i get the gold back but i don't now how much i need to add more SMB because when i tried stannous test i still get a postive indcation of gold in solution my question how i can get the right amount of smb to add and if i dissolve the 18k gold immidatly with aqua regia is this right or i need to dissolve the copper first with nitric then i put the gold in solution with aqua regia.As Master Nater says, you need to test with Stannous.
But first describe your process in more detail.
You need to be sure you have no free nitric acid in solution before you add metabisulfite. You can kill off the free nitric with sulfamic acid or a small amount of copper. If you choose copper stop adding when the solution stops making red fumes and take out the copper.i have about 2.5kg of gold dust from polishing machine the gold is 18k i dissolve the gold with aqua regia immediately and add SMB for recover the gold
pH is the acidity of the solution.no my solution did not produce red fumes when i add metabisulfite i talked with chemist he told me to check the ph of the solution but i didn't got what he exactly want me to check is he refer to check if my soultion have no excess nitric and what is the pH i should get in this case?
There is no specific pH but is should not get higher than 4.i know what is pH my question if you dissolve gold in aqua regia and precipitat with smb what is the the normal ph before and after this process?
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