bigpagoda said:
In picture 1 I can see some black or dark powdery deposits on the side of the beaker and in some spots on the sponge and crystallized stuff in the bottom. I believe this is your gold. Picture 4 is that same beaker with some HCL added right?- if so that is what I expect to see. The other beaker#3 with the powder I think should be barren (don't throw it out.) I still do not see any floating foils in any picture.
neither of these solutions will test positive with smb because the gold (should be) already precipitated. I think in the beaker in picture 4 Have you made any progress with the stannous?
Not really sure how you got the neat crystal or why you made a sponge. I've re-read the process you followed and we are missing something it is almost like there is a hydroxide that has been formed.
The only chemicals you have used are:
Nitric acid
Hydrochloric acid
Sulfamic acid
SMB
Tap water
you have not added any lye or other bases- chlorine or anything else?
The reason I ask is back in the first set of pictures I do not recognize the blue crystals in the filter in figure 4. based on what you say they appeared after you added the tap water and mixed everything back together in figure5. They look like hydroxides to me.
the sulfamic acid should precipitate the lead as lead sulfate which you did not filter out. Have to think about this for a while.
have you heated the beaker with the hcl to see if the powder will dissolve any more (Don't boil or evaporate) also do you have any way to test the ph?
Hello, Thanks for your time.
Before i start, i attached some pictures of the SMB and Sulfamic that i'm using, because i would like to know if i'ts the same you use. SMB in my country is called Meta Bissulfito de Sódio, and Sulfamic Acid is Acido Sulfamico, i posted the back and front of the can of bothe chemicals.
I din't added any lye to the solution, in the end, i waited a few days, and yesterday i was with a black solution, and the crystals and sponge was dissolved because the HCL in previous pictures, just to clarify, Beaker3 and 4 on previous pictures i posted was the same beaker, the only beaker that is not the same it's the beaker on picture2, anyway, yesterday i took the beaker3 and pour off the hcl and in the bottom there was a white powder, than i dissolved it on nitric and distilled water and heat it a little, it became green liquid, after i took the beaker picture2 pour off the liquid and dissolved the the remaining white powder and gold foils in hcl, it became yellow but with a little color of green, i filtered it and in filter there was some black powder, i kept the filters of course, did the test with SMB (because i have no stannous yet) and it was positive for gold, mixed the green solutin and the yellow with little color of green together, used sulfamic acid, but nothing happened, i waited about 1 hour and filtered the sulfamic acid out the solution, i know its acid because everytime i used a paper to test if there was gold the solution started to react to the paper like its corroding the paper, so i heated some distilled water with SMB and poured in solution, but now, the solution stills black and acid and with no precipitation, just no powder, no nothing, just the black solution, like yesterday when i thrown the SMB in the solution, when i tested today, it was positive for gold, my question is, what should i have to do now? use the sulfamic acid in the solution (and if nothing happens keep pouring till i think its good), or should o do other thing? as add more SMB?
Again, thanks you all for your patience and time disposed on helping me.
I would like to say, that i'm reading the forum everyday, a lot of information of course, but i'm learning some tips, i'm enjoying a lot everything.
Thanks you all.