煉鋼轉爐石之無機聚合安定化技術開發

Development of Geopolymer Stabilization Technology for Steelmaking BOF Slag

鄭大偉(T.W. Cheng) ； 李韋皞(W.H. Lee) ； 林冠宇(K.Y. Lin) ； 蔡志達(C.T. Tsai) ； 吳佳正(C.C. Wu) ； 張祖恩(J.E. Chang) ； 林凱隆(K.L. Lin) ； 陳貞光(J.K. Chen)

《鑛冶：中國鑛冶工程學會會刊》 62卷4期 (2018/12) Pp. 52-69

https://doi.org/10.30069/MM.201812_62(4).0004

摘要

本研究針對煉鋼轉爐石，以全新的安定化技術—無機聚合技術（Geopolymer Technology），將轉爐石資源化成為綠色建材，並同時開發其循環製程。由於無機聚合技術製程中含有許多游離矽，游離矽可以將轉爐石中游離氧化鈣或氧化鎂反應成為穩定的矽酸鈣及矽酸鎂，因而安定化並抑制轉爐石的膨脹性。這不但可以有效協助每年所產生數量龐大的轉爐石去化問題，同時可將其資源化成為綠色建材。研究結果顯示，轉爐石為基材的無機聚合材料具有優良的性質，經實驗室及實廠廠拌試驗發現其抗壓強度可達30－40MPa以上。經熱壓膨脹試驗後其體積變化率小於0.5%；與傳統卜特蘭水泥比較，減碳效益達46－84%以上。無機聚合轉爐石產品體積穩定，可循環至原製程中，符合循環經濟的原則。若全面使用此技術開發建材產品，其每年經濟效益可達4.5億元以上。

並列摘要

In this study, geopolymer technology was developed to stabilize/reutilize BOF slags to form green building materials and improved its cycle process. Geopolymer processes containing large amount of free silicon that can react with free-lime or free-magnesium oxide in BOF slag to form a stable sodium silicate or magnesium silicate, thus, inhibit the BOF slag expansion. This technology will not only help to consume BOF slags, but also turn it into green building materials. The laboratory and ready-mixed plant test results show that BOF slag based geopolymer material has great engineering properties. The compressive strength was higher than 30-40MPa. After autoclave expansion test, the volume change rate was less than 0.5%. Compared with traditional Portland cement, the carbon dioxide emission rate can be reduced to 46-84%. The BOF slag based geopolymer material is a volume stable material and can be recycled to the original process. It fulfills the principles of circular economy. If geopolymer technology is employed to produce BOF slag-based building materials, the annual product value will reach over 450 million NT dollars.