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Recovery of Precious Metals from Waste PCB and Auto Catalyst Using Arc Furnace  

Ban Bong-Chan (순천대학교 금속공학과)
Kim Chang-Min (순천대학교 금속공학과)
Kim Young-Im (이화여자대학교 환경공학과)
Kim Dong-Sn (이화여자대학교 환경공학과)
Publication Information
Resources Recycling / v.11, no.6, 2002 , pp. 3-11 More about this Journal
Abstract
Recently, waste printed circuit board (PCB) has significantly increased in its amount due to the rapid development of electronic industries. Since several kinds of noxious materials and also valuable metals are contained in it, the waste PCB is in an urgent need of recycling for the dual purposes for the prevention of environmental pollution and recovery of valuable resources. Also, the catalyst which equipped in the exhaust pipes of automobiles to reduce emission of air pollutants contains precious met-als so that their recovery from the waste auto-catalysts is required. In this study, the recovery of valuable metals from waste PCB and auto-catalyst by arc furnace melting process has been investigated, which is known to be very stable and suitable f3r less production of pollutants due to its high operating temperature. The effect of the kind of flux on the recovery of precious metals was examined by using quicklime, converter slag, and copper slag as the flux. In addition, the influence of direct and alternating current and the applying direction of direct current has been investigated. It was observed that using converter or copper slag as a flux was more desirable for a higher efficiency in the precious metal recovery compared with quicklime. For the effect of current, application of direct current taking the bottom as a negative pole generally showed a better efficiency for the extraction of valuable metals from waste PCB, which was also observed for the case of waste auto-catalyst. The average recovery of precious metals from both wastes by arc furnace melting process was very high, which was up to in the range of 95～97%.
Keywords
precious metals; recovery; PCB; auto-catalyst; arc furnace;
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