7 Questions You MUST Ask Your Precious Metals RefinerOct 6, 2014 . The refining process for precious metals can take anywhere from several days . After final sampling, assay determination, and settlement, your.metals refinery for final processing,Refining of Metals: Distillation, Zone Refining, Chromatographic .In metallurgy refining of metals is the final process. Once the extraction process is complete we must ensure that the metal is free of any impurities.
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