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mixed, the zinc separates and floats to the top with ~2% lead. However, silver dissolves more easily in zinc, so the upper layer of zinc carries a significant portion of the silver. The melt is then cooled until the zinc solidifies and the dross is skimmed off. The silver is then recovered by volatilizing the zinc. The Parkes process largely replaced the Pattinson process, except where the lead contained insufficient silver. In such a case, the Pattinson process

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