| 摘要 |
PURPOSE:To collect a platinum metal with a high yield by dissolving and extracting a waste catalyst using the platinum metal, by a strong acid, adding an excessive iron powder to said catalyst, executing simultaneously hydrogen reduction and cementation, precipitating the platinum metal, and thereafter, adsorbing and removing the excessive iron powder by a magnetic separating machine. CONSTITUTION:A used waste catalyst of a Pt precious metal catalyst of Pt, Pd, etc. carried by a carrier of alumina, silica, etc. is treated by a strong acid water solution of >=60 deg.C of HCl=1.0N, HNO3>0.2N, in a state that it remains uncrashed, and Pt, Pd, etc. are dissolved and extracted. An excessive iron powder is added to an extracted liquid separated from the carrier, a reducing reaction of an H2 gas and a cementation are executed simultaneously within a range of -50mV-250mV of the reducing potential, and Pt and Pd dissolved in the acid liquid are precipitated with a yield of >=95% in a short time. The excessive iron powder mixed to Pt and Pd precipitated in the end is adsorbed and separated by a magnetic separating machine, and Pt and Pd are collected with a high yield.
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