本研究自行配置含鉻、銅兩種不同金屬之焚化飛灰及焚化飛灰混合添加劑，探討經500－1100℃熱處理後，所含兩種不同金屬離子之熱安定化效果，利用scanning electron microscope（SEM）、X-ray powder diffractometer（XRPD）、X-ray absorption spectroscopy（XAS）分析經熱處理後，含鉻、銅樣品之表面形態及物種變化。 研究結果顯示，熱安定化處理針對重金屬鉻而言，鉻金屬之Toxicity Characteristic Leaching Procedure（TCLP）溶出百分率有隨溫度升高而下降之趨勢，其中以飛灰混合kaolin樣品之熱安定化效果最佳，由XAS結果顯示，樣品經500－1100℃熱處理兩小時後，部份鉻物種由原先具移動性之六價鉻還原成穩定三價鉻；而銅重金屬之TCLP溶出百分率則有隨溫度上升而升高之現象，主要原因為經熱處理兩小時，所含銅化合物由原先不具溶解性之CuO轉變為可溶性之CuSO4，因而造成銅TCLP值的上升。 利用SEM觀察表面型態，由結果可發現，在1100℃熱處理後之樣品，其表面結構呈現平滑狀，推測有高溫熔融反應或燒結現象發生，藉由BET比表面積測定儀（BET Micrometer）分析其比表面積值，發現BET值隨溫度升高而降低，推論應是在高溫熱處理下熔融燒結反應發生，因而造成比表面積降低。 This study used Cr/Cu-containing mixture of fly ash and sorbents(α-Al2)O3, kaolin) as samples to illustrate thermal stabilization of Cr and Cu after heating at 500－1100℃ for two hours. We analyzed the difference in morphology and heavy metals species in Cr/Cu-containing samples heated at various temperatures by scanning electron microscope（SEM）, X-ray powder diffractometer（XRPD） and X-ray absorption spectroscopy（XAS）. The Toxicity Characteristic Leaching Procedure（TCLP） results of Cr show that the Cr leaching decreases with increasing temperature. The XAS results of Cr indicates that part of originally loaded Cr(VI) was reduced into Cr(III) after heating for two hours at 500－1100℃. But the TCLP results of Cu show that Cu leaching increases with increasing temperature. We suggest that the reason for Cu leaching increase was that stable CuO was transformed into mobile CuSO4 after heating for two hours. Both XANES and EXAFS fitting results show that probably 30－40％ CuSO4 formed at 900 and 1100℃. The SEM observation indicates that the morphology of Cr/Cu-containing samples became smooth after heating at 1100℃, we suggest that there was sintering phenomenon happened during the heating. The surface area of all Cr/Cu-containing samples was measured by BET micrometer. The results indicate that the surface area decreased after thermal treatment, we suggested that the phenomenon probably resulted from sintering reaction.
