廢鋼鐵經電弧爐高溫熔煉後所產生之鋼鐵還原碴(stainless steel reducing slag , SRS)，其蘊藏高比例游離氧化鈣，應用此特性為二氧化碳吸收劑，並將安定化之電爐爐還原碴拌混水泥製成混凝土，改善混凝土脹裂之問題，以達到資源再生與二氧化碳利用之目的。
本研究運用半批式及填充床反應器，試驗不同實廠電弧爐還原碴之碳酸化反應，研究此固-液-氣三相反應，探討於常壓二氧化碳氣氛下，溫度、含水量及反應時間的最佳碳酸化條件，並以熱重分析儀、非分散式紅外線二氧化碳濃度偵測儀、場發射掃描式電子顯微鏡-能量散射光譜儀等儀器確認其碳酸化效果。研究結果顯示，洗選電弧爐還原碴於小型半批式反應器能有效吸收二氧化碳量，可達0.1338 gCO2/gSRS。進一步建立填充床反應器，以模擬鋼鐵廠出廠料源之直接運用情形，使用0.5mm以下之電弧爐還原碴(DS及US)，調整其總含水量為20±3 wt%時，為最佳碳酸化條件， US與DS於常溫常壓下吸收量分別可達0.1與0.075 g CO2/g SRS，進一步依據CNS1258 及CNS 15286 規範進行試驗，混凝土熱壓膨脹實驗結果顯示未安定電弧爐還原碴以20wt%摻混製成混凝土會產生膨脹破裂狀況，安定化後能將大幅將膨脹率降低至11.1%，而28天抗壓強度試驗中，亦符合法規限制255 kgf/cm2。可確認此最適化參數適用於不同電弧爐還原碴，並依以設計20升半批式反應裝置，實驗結果顯示高度實用性。

The steel reducing slag (SRS) from electric arc furnace (EAF), byproduct of the steel industry, exhibits high potential for carbon dioxide absorption due to its plenty content of free-calcium oxide (f-CaO). The SRS will be stable after carbonization reaction, can be further applied as the additive of cement with low expansion ratio. The process is able to achieve the goal of resource recycle and CO2 utilization.
In this study, SRS of different electric arc furnaces in steel factory was evaluated in the gas-solid-liquid reaction in semi-batch and packed bed reactor, respectively. The SRS reacted with pure carbon dioxide stream continuously under ambient condition. The effects of water contents, temperature, and reaction time on the carbonation efficiency for this process were systematically investigated in detail, where the degree of carbonization was determined by thermogravimetric analyzer (TGA), nondispersive infrared CO2 detector, and Field-emission scanning electron microscope equipped with energy dispersive spectroscopy. (FE-SEM-EDS). The results indicated that the CO2-absorption capacity of the pre-washed SRS was 0.1338 gCO2/gSRS in the small semi-batch reactor. A packed bed reactor was further designed and established for SRS raw material to simulate the filed condition. The largest CO2-absorption capacity of different SRS (US and DS) was obtained with adjusting the water content to 20±3 wt%, where the slag diameter is about 0.5 mm and reaction time is 2 hours. The maximum CO2 adsorption was 0.1 g CO2/g SRS-US and 0.075 g CO2/g SRS-DS under room temperature. Moreover, the properties of autoclave expansion and compressive strength for blended cement with using 20 wt% SRS as additive was examined according to CNS standards (CNS1258 and CNS 15286). The expansion ratio of carbonated US sample was only 11.1 %, which was much less than that of the raw material. The test result of compressive strength also met the requirement of regulation. Finally, the system was magnified to 20 liters semi-batch reactor to ensure the practicability of utilization of SRS from different EAF for CO2 absorption and the economic potential of carbonated product.

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