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RISS 인기검색어
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- 저자 : ( Akihito Nakamine ) (검색결과 1 건)
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( Akihito Nakamine ),( Toshihiko Matsuto ),( Takayuki Matsuo ) 한국폐기물자원순환학회(구 한국폐기물학회) 2018 한국폐기물자원순환학회 심포지움 Vol.2018 No.1
In Japan, there are many ash melting process and gasification melting system are working. Because of high transfer rate of precious metal such as Au, molten metals can be considered as metal resources. In this study, potential as metal resources of molten metals from various types of gasification melting and ash melting facilities was investigated. The questionnaire survey was conducted to all ash melting system and so-called shaft-type gasification system, which produce metals, and sampling was requested. Because precious and rare metal are used in home appliances, collection activity of small electric appliances were investigated. As a result, metal and slag samples were provided from 28 facilities (27.7%). Sample for analysis were taken by c one -quartering method, and it was crushed with a hammer. After digested in HF and aqua regia. Au, Pt, Pd were analyzed by ICP mass spectrometry. Cu was analyzed by ICP emission spectrometry. Si, Ca, Fe were analyzed by XRF. Metal resource potential was evaluated by Total material requirement (TMR), which is the total weight of mass which are moved when the material is mined. The rarer the metal is, the higher TMR per unit weight. Concentration in metal of Au, Pt, Pd is shown in Fig 1, in which Group 1 is electric ash melting furnaces, Group2 is fuel type ash melting furnaces and a DC electric resistance type ash melting furnace, Group3 is coke bed type gasification melting furnaces, and Group4 is oxygen type gasification melting furnaces. Figl shows that concentrations of metals in Group 3 are smaller than in other groups. The different level of concentration could be explained by dilution effect of major constituents shown in Fig.2, which is estimated by multiplying Si, Ca, Fe concentration in metal with weight percentage of metal among all outputs. The transfer rate Si and Ca in Group3 is the highest, and Group 2 show high Fe transfer rate to metal. Ca is derived from slaked lime supplied in the furnace in Group 3, but source of Si is not known yet. Fig.3 shows the estimated TMR which is almost the same tendency as in Fig. 1. Group2 shows the highest TMR, which followed by Group 1 and Group3. There are large variations in Group4. Total amount of metals in all outputs was not correlated with recycling activity of small home appliance. In conclusion, type of furnace influences potential as metal resources of molten metals. The reason is that the amount of transferring Si, Ca and Fe is different by type of furnace.
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