Fariborz Razban
New member
- Joined
- Jun 17, 2023
- Messages
- 3
So here is the issue, I washed the dust like powder I was given by a friend, sth like 60g(the gold is of ore source, probably river, he got it as a payment from somebody and I think the dude has even worked on it with cyanide). first with water, then nitric acid, then added the AR(I went slowly, first HCl then nitric, not much nitric was needed cause as soon as I poured in the HCL it started turning yellow then red was observed and when heat was applied and strong steering(65 C) for 16 hours dark red, I believe it to be super pure since without nitric it was going but I added in total maybe sth less than 30ml(65%) but a lot of HCl was used, sth like 250ml(30%) and 1.5ml of concentrated sulfuric acid(98%) was also added to deal with lead, the entire thing was 320ml on my beaker at the end I applied 120C heat and strong steering with magnetic steerfish for and hour then I let it cool before vacuum filtering it a couple of times over the same filter and washing the filter with distilled water) the damn thing was filtered(I got only silver in my filter paper) and the dark red solution was boiled down to almost half of its original amount, it was blackish red, then I diluted it with distilled water to twice its size(400 ml), which turned it to gold yellow and cooled it to about room temp. then SMB was directly added, first some red foam was observed so I assume my denox wasn't that good, anyway, I kept adding SMB till no brown fume was observed, some dust formed and disappeared before it settles, then the solution turned green, a pale greenish really cloudy solution and no gold, not even a microgram.
I doubled the amount of water, applied heat and kept steering to dissolved the undissolved SMB at the bottom and not much is happening and I'm clue less as to what to do next.
P.S. I added a milliliter of H2O2 and I can see the gold is still there + Stanious test is super positive
P.P.S: despite addition of More water to almost full my 1Lit beaker, there is a lot of SMB at the bottom and some sort of Crystals are forming on top of the solution(very tine and shallow for now).
I was thinking of adding more Hcl to kill the excess SMB maybe and turn it back to yellow then work my way from there again maybe take the NaOH route but I really am scared since in theory I didn't go side track from what I was supposed to get but if I go side track what could I get!!!!
anyway help is urgently required if anyone is kind enough to assist me, I really am clue less, I was thinking of adding some a dilute NaOH solution then H2O2 to let the gold oxide precipitate out and heat it till its pure but I Think I would ruin the whole thing and I know the reaction to be extremely delicate as it can foam like crazy and blow all over the fume hood.
I really would love to know where did I go wrong!!!!! I went by the book for this
update: the solution was neutral, I poured in some HCl and dissolved the remaining SMB in the vessel, the cloud is gone, but the green is still present and no gold still.
I doubled the amount of water, applied heat and kept steering to dissolved the undissolved SMB at the bottom and not much is happening and I'm clue less as to what to do next.
P.S. I added a milliliter of H2O2 and I can see the gold is still there + Stanious test is super positive
P.P.S: despite addition of More water to almost full my 1Lit beaker, there is a lot of SMB at the bottom and some sort of Crystals are forming on top of the solution(very tine and shallow for now).
I was thinking of adding more Hcl to kill the excess SMB maybe and turn it back to yellow then work my way from there again maybe take the NaOH route but I really am scared since in theory I didn't go side track from what I was supposed to get but if I go side track what could I get!!!!
anyway help is urgently required if anyone is kind enough to assist me, I really am clue less, I was thinking of adding some a dilute NaOH solution then H2O2 to let the gold oxide precipitate out and heat it till its pure but I Think I would ruin the whole thing and I know the reaction to be extremely delicate as it can foam like crazy and blow all over the fume hood.
I really would love to know where did I go wrong!!!!! I went by the book for this
update: the solution was neutral, I poured in some HCl and dissolved the remaining SMB in the vessel, the cloud is gone, but the green is still present and no gold still.
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