爐渣中之不穩定鈣系物質應具有吸附二氧化碳之潛力，本研究以固相及液相碳酸化程序分別討論底渣、轉爐石及脫硫渣成分中，液固比、反應溫度、反應氣氛和反應時間等差異所產生的影響，透過計算底渣及煉鋼爐渣中總鈣轉換為碳酸鈣之比率，表示碳酸化之程度，最後利用動力及反應模式對固相及液相碳酸化進行分析。
固相碳酸化程序以氧化鈣為主要反應物種，隨著溫度上升而使鈣轉化率上升，而添加水氣具有增加反應速率及提升鈣轉化率之效果，於溫度600℃、水氣含量30%、二氧化碳分壓10%下反應30分鐘，底渣、轉爐石及脫硫渣鈣轉化率分別達3、7及22%，其影響因子主要為溫度及水氣。液相碳酸化程序則氧化鈣、矽酸鈣及其他鈣化合物皆具有碳酸化能力，於反應溫度100℃、底渣液固比為0.5、轉爐石液固比為0.8、脫硫渣液固比為0.8、二氧化碳分壓10%下反應30分鐘鈣轉化率分別可達19、12及42%。
固相碳酸化透過模式模擬說明轉爐石及脫硫渣符合表面覆蓋模式，且水氣含量增加可降底碳酸化反應之活化能，使反應速率提升。液相碳酸化透過模式模擬，說明底渣、轉爐石及脫硫渣皆符合一階之化學反應模式。

Based on previous studies, the calcium-based ashes and slags have the potential to absorb CO2. Different compositions of various types of ashes and slags would have different effect on the carbonation. This research mainly discusses the effect of different components of MSWI bottom ash, basic oxygen furnace slag and desulfur slag on direct and aqueous carbonation process. This is achieved by determination of calcite conversion ratio of bottom ash, basic oxygen furnace slag and desulfur slag, followed by analysis of kinetic and reaction model of direct and aqueous carbonation process.
The main reactant of direct carbonation process is calcium oxide, the calcite conversion ratio increases as temperature rises, and addition of water vapor could increase the reaction rate and calcite conversion ratio. Moreover, under the condition with temperature at 600℃, water partial pressure of 30%, carbon dioxide partial pressure of 10% and reaction time of 30 minutes, the calcite conversion ratio of bottom ash, basic oxygen furnace slag and desulfur slag is 3, 7 and 22%, respectively. On the other hand, calcium oxide, silicate calcium and other calcium compounds possess carbonation ability in the aqueous carbonation process. Moreover, when bottom ash, basic oxygen furnace slag and desulfur slag each with respective liquid/solid ratio of 0.5, 0.8 and 0.8 carried out aqueous carbonation for 30 minutes with carbon dioxide partial pressure of 10% at 100℃, the calcite conversion ratio for bottom ash, basic oxygen furnace slag and desulfur slag is 19, 12 and 42%, respectively.
The simulation of direct carbonation demonstrated that basic oxygen furnace slag and desulfur slag fit the surface coverage model, and increase the level of vapor lowered the activation energy needed for carbonation thus increased the rate of reaction process. Furthermore, the results from simulation of aqueous carbonation showed that bottom ash, basic oxygen furnace slag and desulfur slag followed the first order chemical reaction model.

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