lukers Posted May 10, 2011 Share Posted May 10, 2011 (edited) after the agua regia has eating the gold how do you get yhe gold back out???? Edited May 10, 2011 by lukers Link to comment Share on other sites More sharing options...
mississippichem Posted May 10, 2011 Share Posted May 10, 2011 after the agua regia has eating the gold how do you get yhe gold back out???? By dissolving gold in aqua-regia, you've oxidized the gold to chloroauric acid: [ce] HAuCl_{4} [/ce], proper name hydrogentetrachloroaurate{III}. So you need some reducing agent to reduce it back to gold{0}. Or I'm sure it can be done electrolytically somehow. Wikipedia says it can be done by heating dry chloroauric acid to give gold(III) chloride, which can then be reduced by dimethyl sulfide. Link to comment Share on other sites More sharing options...
lukers Posted May 12, 2011 Author Share Posted May 12, 2011 what does(heating dry chloroauric) mean exactly. also do I need to bring the Ph up to 7 in order for it to work?? and thank you so very much.. lukers Link to comment Share on other sites More sharing options...
Fuzzwood Posted May 12, 2011 Share Posted May 12, 2011 Simple: get a flask, dump HAuCl4 in (which is a salt), then heat it. HCl will come off of it Link to comment Share on other sites More sharing options...
911Metal Posted February 19, 2016 Share Posted February 19, 2016 Here is more about Agua Regia & Gold https://www.911metallurgist.com/blog/extraction-recovering-gold-silver-jewelry-electronics-escrap + https://www.911metallurgist.com/blog/how-to-use-aqua-regia-to-purify-gold BE CAREFUL! The Dangers Of Aqua Regia: Aqua regia cannot be boiled or simmered in the house or where it is not well ventilated. This can cause serious illness or KILL YOU! Use a vent hood with an exhaust fan or simmer in the open. Hydrochloric acid is very dangerous. It CAN BURN TO THE BONE and is extremely painful. In most cases, it has burned you before you know it. Nitric acid can be absorbed through the skin, causing nitric acid poisoning, which makes you very ill. WEAR RUBBER GLOVES! Aqua regia, nitric acid and hydrochloric acid CAN KILL IF SWALLOWED. Always wear rubber gloves, plastic safety glasses and a plastic or rubber apron. Aqua regia can ruin your clothes and shoes. Link to comment Share on other sites More sharing options...
John Cuthber Posted February 19, 2016 Share Posted February 19, 2016 It can ruin your lungs; replacing shoes and clothes is easy... Link to comment Share on other sites More sharing options...
Strange Posted February 19, 2016 Share Posted February 19, 2016 Another popular use of aqua regia is to redirect traffic to one's blog. Link to comment Share on other sites More sharing options...
Sensei Posted February 19, 2016 Share Posted February 19, 2016 Another popular use of aqua regia is to redirect traffic to one's blog. Better keyword is "liquid sodium".. (more traffic 110m vs 1m for "aqua regia") Link to comment Share on other sites More sharing options...
911Metal Posted February 20, 2016 Share Posted February 20, 2016 Did you even see the footer article on Gold that was recovered from scrap electronic 60-40 (tin-lead) solders by drossing with aluminum or zinc at elevated temperatures? The gold, together with other metallic impurities, collected in the dross phase which could then be separated from the molten solder by skimming or filtering. Drossing upgraded the gold concentration by a factor of 10, Further upgrading was achieved by a combination of steps including an oxidation roast and either a combined cyanidation-amalgamation treatment or an aqua regia leach. The gold was then recovered in highly concentrated form from the aqua regia or cyanide solutions by cementation and from the amalgam by volatilization or dissolution of the mercury. Link to comment Share on other sites More sharing options...
Phi for All Posted February 20, 2016 Share Posted February 20, 2016 Did you even see the footer article on Gold that was recovered from scrap electronic 60-40 (tin-lead) solders by drossing with aluminum or zinc at elevated temperatures? The gold, together with other metallic impurities, collected in the dross phase which could then be separated from the molten solder by skimming or filtering. Drossing upgraded the gold concentration by a factor of 10, Further upgrading was achieved by a combination of steps including an oxidation roast and either a combined cyanidation-amalgamation treatment or an aqua regia leach. The gold was then recovered in highly concentrated form from the aqua regia or cyanide solutions by cementation and from the amalgam by volatilization or dissolution of the mercury. ! Moderator Note Please cite sources when you copy/paste, otherwise it looks like plagiarism. http://www.cdc.gov/niosh/nioshtic-2/10007808.html Link to comment Share on other sites More sharing options...
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