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• 19:53, 2 December 2024 Admin talk contribs created page Producer gas (Created page with "The '''Parkes process''' is a pyrometallurgical industrial process for removing silver and gold from lead. It is an example of liquid-liquid extraction. ==Principles== The process takes advantage of several properties of zinc. # Zinc has low melting (420°C) and boiling (907°C) points # As liquids, zinc and lead are immiscible # Noble metals are much more soluble in zinc than in lead. ==Overview== Zinc is added to liquid lead that contains silver, then th...")