轉爐石作為載氧體的應用探討

Utilization of Basic Oxygen Furnace (BOF) Slag in the Production of Oxygen Carriers for Chemical Looping Combustion

李秀霞(H.H. Lee) ； 王厚傳(H.C. Wang) ； 陳瑞燕(J.Y. Cheng) ； 張名惠(M.H. Chang)

《鑛冶：中國鑛冶工程學會會刊》 64卷2期 (2020/06) Pp. 9-19

https://doi.org/10.30069/MM.202006_64(2).01

摘要

轉爐石是一貫作業煉鋼製程所產生的副產物，主要成分含有氧化鈣、氧化鐵、氧化矽及氧化鋁等，其中，氧化鐵成分可作為化學迴路程序之載氧體的活性原料，氧化鋁可為惰性原料，而氧化鈣可以提升載氧體的攜氧能力。本研究以不同粒徑未經處理的轉爐石進行氧化還原迴圈（redox cycle）測試，發現粒徑較小的轉爐石之轉化速率最快，且不同粒徑的轉爐石在經過50次氧化還原迴圈測試後， 其轉化率均可達85%以上。但因轉爐石中的氧化鐵供氧量略顯不足，故再以未經處理之轉爐石作為部分替代原料添加於載氧體（Fe_2O_3/Al_2O_3）組成中，探討其轉化率及機械強度。結果顯示，添加轉爐石的載氧體SB-BOF（0.6-1.4）之轉化率高於未添加轉爐石的載氧體SB-BOF（0）（57.15%），在經過50次氧化還原迴圈測試後，其轉化率仍可達58.7-81.51%。但載氧體SB-BOF（0）之機械強度表現卻是優於SB-BOF（0.6-1.4），SB-BOF（0）的磨耗率僅1.05%，而SB-BOF（0.6-1.4）的磨耗率則高達5.35-11.76%。

關鍵字

轉爐石 ； 載氧體 ； 氧化鐵

並列摘要

Basic Oxygen Furnace (BOF) slag is a major by-product generated from the integrated steelmaking process. The main components of the slags were CaO, Fe_2O_3, SiO_2, Al_2O_3, etc. Among these components, the Fe_2O_3 can be used as an active element of the oxygen carriers (OCs) in the chemical looping combustion process (CLP), and the Al_2O_3 as an inert support, respectively. In addition, the present of CaO in the slag can also improve the oxygen carrying capacity of the OCs. In this study, the BOF slags with different particle sizes were tested through the cyclic redox reactions to investigate the size effect on the redox efficiency. The result shows that the redox conversion higher than 85% can be reached in all samples of BOF slags with different sizes, and among them the BOF slag with the smallest particle size has the highest reaction rate. However, the oxygen carrying capacity of BOF slag is not high enough, thus it can be only supplied to replace part of the raw materials of Fe_2O_3 and Al_2O_3 for preparing the artificial oxygen carriers. The results has shown that the conversion of the OCs contains BOF slag (SB-BOF (0.6-1.4)), 58.7-81.5% after 50 redox cycles, is higher than that of the OCs without containing BOF slag (SB-BOF (0)), 57.15%. For the mechanical strength, the SB-BOF (0) is higher than that of the SB-BOF (0.6-1.4). The attrition rate of SB-BOF (0) was 1.05 wt. %, and 5.35-11.76 wt. % of SB-BOF (0.6-1.4), respectively.

並列關鍵字

Basic Oxygen Furnace (BOF) slag ； oxygen carriers ； Fe_2O_3