Methods for the Recovery of Platinum, Iridium, Palladium, Gold, and Silver from Jewelers' Waste
U.S. Government Printing Office, 1924 - Gold - 14 pages
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action added addition alloy alloys containing amalgam ammonium chloride apply aqua regia base metals beaker become boiling borax glass bottle cent CHEMICAL complete concentrated contain platinum containing copper covered decantation depending dilute nitric acid dirt dish dissolved distilled water dryness evaporated extracted filter filter paper filtrate free or alloyed fresh gold granulated heated hot water hydrochloric acid lead liquid material mercury method METHOD CHEMICAL method g mixed mixture moistened nitric acid obtained palladium particles placed plati platinum and iridium platinum metals pound poured precipitate present pure quantity ratio of silver recovered removed repeated residue retort salt sample sand bath separation settle shown in method silver chloride silver to gold sodium solution stirred stream sulphuric acid Table temperature tested tion treated treated by methods treatment turns valuable metals volume warmed washed water bath weight zinc