以轉爐石間接碳酸化程序進行二氧化碳再利用

Implementation of BOF Slag Indirect Carbonation Process for Carbon Dioxide Utilization

郭于寧(Yu-Ning Kuo) ； 張名惠(Ming-Hui Chang) ； 張書懷(Shu-Huai Chang) ； 徐恆文(Heng-Wen Hsu) ； 萬皓鵬(Hou-Peng Wan)

《燃燒季刊》 107期 (2019/11) Pp. 27-36

https://doi.org/10.30041/CQ.201911_(107).0003

摘要

本研究使用中鋼轉爐石原料和氯化銨萃取溶劑，透過間接碳酸化程序再利用二氧化碳合成輕質碳酸鈣。根據實驗結果顯示，轉爐石萃取反應於60分鐘達平衡，隨萃取溶液濃提高可增加轉爐石中鈣萃取量，並保持萃取溶液之高選擇性，反應後轉爐石穩定且可合成高純度方形和球型碳酸鈣產物。平均單位原料產量約每100克轉爐石生成10克碳酸鈣並消耗4.4克二氧化碳。若將我國年產量80萬噸轉爐石細粉料（粒徑＜5μm）應用於生產輕質碳酸鈣，估計可生產8萬噸／年高價輕質碳酸鈣，並可再利用3.5萬噸／年二氧化碳，達到轉爐石資源化並兼顧減碳與環境效益。

關鍵字

轉爐石 ； 間接碳酸化反應 ； 二氧化碳 ； 輕質碳酸鈣

並列摘要

The present study used CSC basic oxygen furnace (BOF) slags and NH_4Cl_((aq)) to extract calcium, and then utilized CO_2 to synthesize light calcium carbonate through indirect carbonation process. The results showed that the extraction reaction reached equilibrium at 60 minutes, and the amount of extracted calcium was increased in 2 M NH_4Cl_((aq)) with high extraction selectivity. After the reaction, BOF slags became stable and calcite and vaterite calcium carbonates were then derived. On average, 100 g BOF was able to form 10 g calcium carbonate and consume 4.4 g CO_2 during the reactions. Considering the annual production of BOF slag (diameter＜5 μm) is 800,000 tons in Taiwan, the present approach could potentially produce 80,000 tons calcium carbonate and reduce 35,000 tons CO_2.

並列關鍵字

basic oxygen furnace slag ； indirect carbonation reaction ； CO_2 ； light calcium carbonate