FIRE ASSAY TIN COLLECTION A PRACTICAL TOOL FOR ASSAYING COMPLEX REFINERY SWEEPS

摘要

Iridium, rhodium, and ruthenium melted with excess tin are soluble in HCl -H_2O_2 or HCl -HNO_3 and are conveniently determined by AA or ICP. The same is true for platinum, palladium, gold and silver. Methods of determining the precious metals after tin collection supplement traditional lead collection methods and allow the refinery assay laboratory to determine iridium, rhodium and ruthenium and to determine the other precious metals in their presence. Recoveries of .5 to 100 mg of each precious metal carried through tin collection, dissolution, and measurement are evaluated. Each step in the process is described.