電弧爐還原碴（EAF ladle slag）的化學組成富含Ca、Si元素，與水泥、高爐石相似，然而因含有f-CaO、f-MgO，若將還原碴作為工程材料應用時，存在健性不穩定的問題，其中又以f-MgO所造成的膨脹問題較為嚴重，因此解決f-MgO的膨脹為爐碴再利用的首要目標。僅管許多研究已開發各種不同的還原碴安定化程序，但是這些技術往往伴隨著高耗能、高成本、效率低、工作性差等的問題，因此尋找一個綠色的安定化程序，使還原碴能被再利用是個重要課題。本研究首先以不同煅燒程度的MgO進行反應速率與膨脹行為的探討，接著依配比設計調質劑的添加以評估調質效果，同時利用熱壓膨脹試驗評估其抑制膨脹的效果，最後將調質技術與配比應用於還原碴中，以驗證對還原碴之調質成效，並進行工程應用與環境相容性之試驗，以評估調質還原碴作為卜作嵐材料之潛力及其環境相容性。
研究結果顯示，氧化鎂的晶粒大小會受到煅燒的條件影響而有所差異，其中輕燒氧化鎂（Light-burnt Magnesia）、重燒氧化鎂（Hard-burnt Magnesia）、僵燒氧化鎂（Dead-burnt Magnesia）的晶粒大小分別約為24 nm、116.64 nm、132.91 nm。氧化鎂的晶粒與粒徑會影響其反應性與反應速率，其中以晶粒大小的影響較為明顯，晶粒愈大，反應速率愈小，其差異達數百倍，而粒徑大其反應速率較小；其差異約1~3倍。實驗結果得知，LMgO反應速率快不會對水泥漿體產生健性不穩定的問題，HMgO與DMgO分別添加至5%與2.5%便會造成水泥漿體出現健性不穩定的現象。透過熱重熱流分析不同煅燒MgO之水泥漿體得知造成健性不穩定的氫氧化鎂變化量約為6%，可以此作為評估調質成效之依據。
反應性低的HMgO、DMgO與調質劑依MgO與SiO2設計適當的比例，得以生成不具膨脹性的鎂矽水合物（Magnesium Silicate Hydrate，MSH）。重燒氧化鎂與調質劑若以2：8的比例所製水泥漿體則可以符合健性評估的標準，僵燒氧化鎂由於反應性更差，因此僵燒氧化鎂與調質劑需要以1：9的比例所製水泥漿體才可達到健性評估的標準。還原碴中氧化鎂的晶粒接近僵燒氧化鎂約為128 nm，以氧化鎂與調質劑1：9的比例進行調質其熱壓膨脹的長度變化量為0.04%可符合品質標準（<0.8%），亦即此調質技術得以達到安定化還原碴之效果。同時調質還原碴之活性指數皆符合品質標準所訂定之75%以上，而環境相容性方面也沒有重金屬溶出的疑慮，因此本研究開發的調質技術可將還原碴轉化為優良的卜作嵐摻料。

The chemical composition of EAF ladle slag is rich in Ca and Si elements, which is similar to cement and ground granulated blast furnace slag. However, if ladle slag is used as an engineering material, the soundness can’t confirm the standard due to free CaO (f-CaO) and free MgO (f-MgO) in ladle slag. Between f-CaO and f-MgO, the soundness problem caused by f-MgO is more serious, so solving the expansion of f-MgO is the primary goal. Although many researches have developed a variety of different EAF ladle slag stable technology, but these technologies are often accompanied by high energy consumption, high cost, low efficiency, and poor workability. To reuse EAF ladle slag, it is an important issue to find a green stabilization program. In this study, the reaction rate and expansion behavior of MgO with different calcination levels were discussed, and then evaluate the modify effect with addition different ratio of modifiers. At the same time, the autoclave expansion test is used to evaluate the modify effect. Finally, the modify technology and ratio are applied to EAF ladle slag to verify the modify effect on EAF ladle slag, and the engineering application and environmental compatibility test are carried out to evaluate the potential of the modify ladle slag as a Portland material and its environment compatibility.

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