摘要
資源回收、精煉與再利用是目前全球先進國家積極投入的重點研究科技，也是人類永續發展的重要指標。本研究主要是針對回收自廢日光燈螢光粉的氧化釔進行精煉提純，最初原料含有95.02 wt.%的元素釔(base on metal)，以及鈣、鋁、鋅、鎂、鐵、銪、銦等雜質，利用高溫飽和溶解－低溫過飽和結晶、還原及熱處理進行純化。結果顯示以硝酸高溫飽和溶解氧化釔再進行低溫靜置，可有效的讓釔以硝酸釔的形態結晶產出，同時因為其他元素在溶液中的濃度甚低不易析出因此釔的純度能夠提高。此外，樣品經過還原後，鋅、銦、銪會以金屬相存在，再利用真空高溫熱處理可將其除去，進一步達到釔提純的目地，經過這一系列方法的處理，釔的純度可達到99.9 wt.%以上。
並列摘要
Recycling, purification and reuse of resources are currently important topics for the advanced countries. It is an essential indicator for sustainable development of the earth. In the present study, yttrium oxide obtained from waste fluorescent powders has been treated for purification. The raw material contains yttrium (95.02 wt.%, the main metal element), calcium, aluminum, zinc, magnesium, iron, europium and indium. The saturated solution of yttrium nitrate is prepared from dissolving yttrium oxide into nitric acid (8.25 N) at 60 ℃, 70 ℃, 80 ℃ and 90 ℃, and the recrystallization of yttrium nitrate takes place when the temperature decreases to 0 ℃. Experimental results show that recrystallization of yttrium nitrate under suppersaturation can increase the degree of purity of yttrium. On the other hand, thermal treatment, i.e. reduction of oxide followed with vaporization in vacuum, can efficiently remove europium oxide, zinc oxide and indium oxide away from yttrium oxide.
被引用紀錄
延伸閱讀
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