the gold-bearing residue was leached in dilute aqua regia to solubilize the gold. high-purity gold was precipitated from the aqua regia solution with oxalic acid sulfurous acid sodium bisulfite and gaseous sulfur dioxide. the leaching-precipitation experiments recovered 99.9 pct of the gold. the gold precipitates […]
i am doing the gold recovery from sweep dust that we collected from our gold workshop using aqua regia. i wanted to know which would be better option to use for gold recovery after it has dissolved into aqua regia and turned to auric chloride. options are hydrogen hydride or sodium metabisulphite.
gold from aqua regia with sodium sulfite. separate gold from palladium and platinum solution using sodium bisulfite as reducer. recovery refining gold percent lower scrap jewelry ore
hi all great forum i have learned a lot. i have a question about precipitation of gold chloride from aqua regia. it seem that people on this forum use sodium metabisulfite (na2s2o5) whereas other sources on the internet (see links below) say to use sodium bisulfite (nahso3).
we can use sodium sulfite na2so3 to precipitate gold from a gold chloride solution aucl3. here is an equation of hydrochloric acid hcl and sodium sulfite na2so3 the products from this reaction is sodium chloride salt nacl and sulfur dioxide gas so2 (g) in a solution of water h2o. na2so3 + 2hcl --> 2nacl + so2 (g) + h2o