Now all the gold should be drawn out of the solution and the acid should now be a clear amber color with a brown mud settled at the bottom.ġ1. If you see this color change then give the precipitant more time to work and/or add more precipitant.ġ0. If any gold is still dissolved in the acid, the wet spot will turn a purple-black or a purple-brown. Put a drop of gold detection liquid on the wet spot on the paper towel. Remove it and touch that end to a paper towel to make a wet spot. To test the solution for remaining gold, first immerse the end of the stirring rod in the acid. Allow precipitant ( sodium bisulfite ) to fully draw out all the gold out of the solution, test for gold in the remaining solution, if it tests positive for gold, you may have to add more precipitant ( sodium bisulfite ).ĩ. Occasionally agitate the solution with a glass stir rod, as the brown particles continue to form they will sink to the bottom of the container, this brown "mud" is, despite its appearance, pure gold.Ĩ. Add precipitant ( sodium bisulfite ) slowly in minute amounts to the acid solution containing the dissolved gold, immediately the acid solution containing the dissolved gold will change to a muddy brown appearance as brown particles of gold form in the solution. You've just raised the pH of the acid from 0.1 To 1.0, killing the nitric acid but not the hydrochloric.ħ. When the acid solution containing the dissolved gold stops reacting to the addition of water/urea (urine), stop adding the water/urea (urine). Do not add the water/urea (urine) so quickly that the acid foams out of its container. The acid solution containing the dissolved gold will foam with the addition of the water/urea (urine). Slowly, add the water/urea (urine ) to the acid solution containing the dissolved gold. If the acid solution containing the dissolved gold is murky, it may contain particles and should be re-filtered with a finer grade paper filter.Ħ. The acid containing the dissolved gold will be an amber to emerald green color depending on the purity of the gold and should be clear (not murky or cloudy). The remaining particles should not be discarded as these may contain other precious metals!ĥ. Once all gold is dissolved, filter out any particles out of the acid solution containing the liquified gold into another glass container using a fine stainless strainer. Allow impure gold to dissolve for an hour to overnight for complete dissolution.Ĥ. To the container, add 120 ml of hydrochloric or muriatic acid for every ounce of metal in the container.ģ. To the container, add 30 milliliter of nitric acid for every ounce of metal. Aqua regia - Mix one part nitric acid to 3 parts hydrochloric acid. Place impure gold to be dissolved into a glass or plastic container.Ģa. GOLD REFINING STEP BY STEP INSTRUCTIONSįor every ounce of scrap gold you are going to refine you will need a capacity of 300 milliliter container for the aqua regia solution.ġ. why am I still not seeing the cathode getting thicker after almost 4 weeks of total run time? Joshua WertĪ. any theories on what would cause this? 2. the solution also seems to have particles of corroded copper (dark green) floating on it. I am guessing this batch must have had a different metal in it somewhere but I am unsure what metal would cause such a reaction. Repeating the process with the already saturated mix resulted in the mix taking on more of a milky white appearance. I figured this was due to how little copper plated out prior to the gold flaking off. The first attempt seemed to follow this theory however, I did not notice any change in the thickness of my cathode. My theory was that the acetic acid with added sodium chloride would dissolve the copper and nickel allowing it to plate onto the copper sheet while the gold would sink to the bottom. My first attempt at recovering the gold was with vinegar and salt mix for my electrolyte. I am a little bit of a dumpster diver and have plenty of areas where I can get computer parts from, with a lot of gold left on them so I had to wait for about 8 months before finally I found some [adv: on About a year and a half ago I heard you could recover the gold out of computer parts.
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