本研究主要針對焚化飛灰做資源循環及加值化，材料來源為來自新北市某焚化爐之一般廢棄物焚化飛灰。本實驗流程分成三大部分。第一部分為化學組成分析、水洗及酸洗比較：將焚化飛灰以XRD、XRF、TCLP、三成分分析及ICP-OES半定量、ICP-OES全定量分析、硫酸鹽-濁度劑、鹼度-滴定法等方法對焚化飛灰進行全方面分析得到焚化飛灰的化學組成，接著以固液比1:10分別以鹽酸及去離子水溶解後通過酸洗及水洗並以500rpm攪拌，待攪拌完成後，以抽氣過濾漏斗過濾並取其過濾後溶液，使用ICP定量分析，以此基礎比較溶出離子種類多寡以決定後續處理方法。
本研究之第二部分為模擬焚化飛灰水洗溶液的Solvay Process實驗，因此研究非採用工業式連續生產製程，受到二氧化碳通入量、氯化鈉濃度、反應環境溫度三大因素影響，故需要找到二氧化碳通氣量、氯化鈉濃度、Solvay Process反應溫度三個最佳參數數據，氨水添加量均為氯化鈉莫爾數的3.3倍。
最後一部分為焚化飛灰水洗溶液的Solvay Process實驗，通過第二部分所取得之數據，將最佳參數套用至焚化飛灰水洗溶液的Solvay Process實驗，由於Solvay Process的特性，其產物為碳酸氫鈉居多，通過烘乾後得到產物固體。經過XRD分析及使用鹼度滴定法測定其成分組成，可得知使用焚化飛灰水洗溶液是否能當作Solvay Process 之原料並再次利用以得到高純度碳酸鈉與碳酸氫鈉混合物並達成廢棄物循環利用之目的。

This study investigates the resource recycling of sodium-based incineration fly ash by integrating the Solvay Process to synthesize sodium bicarbonate. The primary scope and objective are to develop a circular economy model that simultaneously addresses waste reduction, resource recovery, and carbon capture and utilization (CCU). The methodology involved comprehensive characterization of fly ash using XRD, XRF, and ICP-OES, followed by a pretreatment comparison between water washing and acid leaching. Process parameters, including carbon dioxide flow rate and reaction temperature, were optimized using simulated solutions before being applied to actual fly ash washing filtrate. Results indicated that water washing effectively dissolved sodium chloride while stabilizing heavy metals, whereas acid leaching released significant toxic elements. The optimal reaction conditions were identified as a carbon dioxide molar ratio of 1.25 relative to sodium chloride and a temperature of 25°C. Applying these parameters to actual fly ash filtrate yielded a sodium removal rate of 79.59%, surpassing typical industrial standards of 72-76%. The synthesized product was confirmed to be a mixture of sodium bicarbonate and Trona. The principal conclusion is that sodium-based fly ash is a viable raw material for the Solvay Process. This approach successfully converts hazardous waste into valuable carbonate products while sequestering carbon dioxide, offering a feasible solution for sustainable waste management and economic value creation.

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