碳酸化電弧爐渣應用於水泥取代之研究

Carbonation of Electric Arc Furnace Slag for Cement Replacement

陳劼立(Chieh-Li Chen)

指導教授 ： 蔣本基

國立臺灣大學/工學院/環境工程學研究所/碩士(2015年)

https://doi.org/10.6342/NTU.2015.02174

摘要

CO2對於溫室效應的影響是無法忽視的，如何減少更多的二氧化碳排放進入大氣中以及減緩全球暖化的發生，是個非常急迫性的課題。在日常生活中實行節能減碳雖能有效的降低能源的消耗，並減少CO2的排放，但是要有更顯著的效果，應該要針對CO2排放的最大來源─化石燃料業著手進行改善。鹼性固體廢棄物碳酸化程序係根據高鹼度的固體廢棄物溶出鈣、鎂等鹼土金屬離子做為吸附質，並且與CO2 氣體溶解於異體內的碳酸根離子結合形成固態碳酸鈣，同時達到CO2 的捕捉以及安定廢棄物的目的。影響碳酸化效率主要為反應時間(1-60分鐘)、溫度(20-70˚C)、旋轉床轉速(700-1200rpm)以及固液比(20-40)。本研究目標為：（一）以電弧爐還原碴作為吸附材料，利用超重力旋轉填充床進行CO2捕獲；（二）利用反應曲面法評估各種不同參數條件下捕獲CO2的效率；（三）利用碳酸化反應後的爐渣進行水泥取代試驗，以檢測碳酸化電弧爐碴作為水泥取代材料之可行性。

關鍵字

二氧化碳捕捉 ； 超重力旋轉填充床 ； 還原碴 ； 反應曲面法 ； 水泥取代

並列摘要

In this study, an integrated process of waste-to-resource technology was developed. Carbon dioxide (CO2) sequestration using the accelerated carbonation of electric arc furnace (EAF) slag under various operational conditions in a high-gravity rotating packed bed (RPB) was investigated. Moreover, wastewater neutralization and product utilization were investigated as well. The performance of CO2 capture by EAFS were evaluated under various levels of reaction time, reaction temperature, rotational speed and liquid-to-solid ratio. The samples of reacted slurry were analyzed quantitatively and qualitatively by using thermogravimetric analysis (TGA) and X-ray diffraction (XRD), respectively. Furthermore, the morphology and microstructure of samples were also examined using scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX).
Furthermore, utilization of electric arc furnace (EAF) slag as cement replacing materials for Portland cement has been examined. Both fresh and carbonated EAF slag were blended in the cement with the percentages of 5, 10, 15 and 20% replacements of Ordinary Portland Cement (OPC) were tested for compressive strength. According to ATSM C109 regulation, the cement mortars were tested at 3, 7 and 28 days of curing age with the 50 mm x 50 mm x50 mm molds. The physico-chemical characteristics and structure of the hardened cement mortars were studied. In addition, the performance of EAF slag as a filler in the OPC-EAF slag mortars was examined.

並列關鍵字

Carbon Capture ； Accelerated Carbonation ； Rotating Packed Bed ； Electric Arc Furnace Slag ； Cement Replacement

參考文獻

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