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Precipitate gold free#
I have a further 30kgs of RAM boards to process but I want to get it right before stripping everything down.Whatever method of gold precipitation be used it is of great importance that the solution should be absolutely clear and free from suspended matter, and in practice it is almost impossible to obtain solution from slime treatment, either by decantation or by means of the various types of slime filter, that is sufficiently clean to give the best results.
Precipitate gold how to#
Could I follow the same process I have for the fingers to process the chips? If not could you recommend how to process these please? Also do you know how much gold I should expect to recover from 2.2 lbs of RAM chips? I also have about 2.2 lbs of RAM chips to process which I have burnt, crushed, sieved and removed all of the metallic parts using a magnet. Thank you for the clarification regarding what I should expect from the 1 pound of fingers. the sludge?īelow is a photo of the stannous test results, it was definitely dark purple/black as opposed to a brown. The instructions I used as listed above stated that I needed to use 6% sodium hypochlorite but I used 14-15%, would this also have caused an issue I.e. If this is what caused the sludge then I will have to spend more time cutting them closer to the fingers and washing the boards off before proceeding to ensure they are clean. I processed RAM fingers only, but they were not as clean cut as they should have been so quite a few of the individual finger cuts included a small portion of the board with components still on them. The powder I was left with was a light brown colour at the start of the melting process. The photo I sent with my final results were a bit misleading as it contained little fragments of the graphite crucible as I had difficulty in removing the so called resultant gold, when I removed it parts of the crucible broke off.
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Chlorine is very toxic, one accidental whiff could leave you disabled for life with pulmonary problems and "dissolved" lung tissue. As Dave said, if you do not know what is happening with your experiment, and you do not know for sure what addition of this and that will cause, DO NOT DO IT. And if you are able to cautiously smell it, there is enough in the solution.
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SO2 is clearly evident when present, it is unmistakeable. Do not inhale much, just to the "tip of your nose". Fan the fumes with your hand towards your nose SLOWLY, be sure you do not stand closer than half meter from the beaker. Learn how to properly sniff chemicals as chemist. Very pungent smell, sulfurous, unbearable. Just be sure you do not stick your nose to the beaker, or it will knock you down pretty certainly. "Nose testing" for SO2 is very easy, but SO2 is not healthy at all. If you cannot get some sort of sulfite, use ferrous sulfate for precipitation. Sulfur dioxide gas will also work perfectly. You can use sodium metabisulfite (SMB), sodium sulfite or sodium bisulfite. For that reason I think this isn't your problem.Ĭlick to expand.Yes, you can filter the crystals, rinse them with some water.Īs Stibnut mentioned, it is relatively up to you which form of sulfite you use. However, bisulfite is good at reducing chlorine to chloride so you likely reduced it when you added a large amount of it to your solution. A similar thing happens with excess nitric acid in aqua regia. If you have too much chlorine remaining in solution, gold will tend not to drop because it is re-oxidized and put back into solution by the chlorine. The other thing I noticed about the Instructables post is that they never heat their bleach + HCl solution or do anything else to drive off the excess chlorine after the gold is dissolved. If you can't smell any sulfur odor, this would be a good indication that you had bisulfate instead. It's the release of sulfur dioxide in solution that does the work of reducing gold salts to the metal. Since you put a whole lot of the bisulfite in your solution, does it smell pungent, like burnt matches, burning sulfur, or volcanoes? This is sulfur dioxide and would indicate that you had the right compound. So that's one possibility - make sure you have bisulfite rather than bisulfate. However if you used bisulfate, which the post you linked to seems to confuse with bisulfite, nothing would happen - that contains sulfur in the +6 oxidation state rather than the needed +4. Bisulfite and metabisulfite exist in an equilibrium with each other in solution, so it does not make a difference whether you use bisulfite or metabisulfite to precipitate gold.