Electrorefining of gold pdf editor

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the electrical properties of copper is the main reason for electrorefining. The second reason for electrorefining is the extraction of some noble impurities, normally present in non-refined copper (anodic metal), such as: gold, silver, platinum and palladium etc2. As stated previously, anodic copper contains between 0.5 and 2 % of The electrolyte solution you made will dissolve the gold from the scrap, and the positive charge in the gold will cause it to attract to the negatively charged steel. All of the gold in the electronics scrap will form onto the steel, where it can be peeled off and set aside until you have enough to refine. Copper from electrorefining, after melting and casting, contains less than 20 ppm impurities, plus oxygen which is controlled at 0.018-0.025%. Electrorefining entails electrochemically dissolving copper from impure copper anodes into an electrolyte containing CuSO 4 and H 2 SO 4 and then electrochemically depositing pure copper from the electrolyte onto stainless steel or copper cathodes. able by-products such as silver and gold. Electrorefining in a CuS04-H2S04 elec­ trolyte is universally used to produce the required high-purity copper from the impure anodes. Although some of the impurities dissolve during electrore­ fining and concentrate in the electrolyte, other elements are insoluble and accu­ Electrowinning has proved to be an effective and simple method for recovering gold from the eluate. Electrowinning is done simultaneously with the elution. The barren eluate is recycled to the eluant tank and is recycled for the next elution after the reagents have been made up to their relevant concentrations.