電弧爐精煉副產物之高值化再利用技術研究

Research on High-Value Recycling Technologies for By-products from Refining of Electric Arc Furnace

還原碴為電弧爐(Electric Arc Furnace, EAF)精煉脫硫後的副產物，以世界鋼鐵協會所統計之2015~2022年的台灣平均EAF製程產鋼量8.51百萬噸/年為基準，則預估每年將產出約17萬公噸的還原碴，因富含活性氧化鈣而限制其再利用價值。本研究設計3種方案的環保脫硫技術來針對還原碴進行活化再利用，並進行脫硫率、減渣量與組成相等特性評估，來探究其可商業化的潛力。結果顯示方案一之100%還原碴回爐技術(83%還原碴+17%改質副原料配方)，可以達到27.5%的減渣量與66.4%的脫硫性能;方案二40%還原碴回爐技術(53%還原碴+47%改質副原料配方)，且脫硫劑成份為58%CaO-25%Al2O3-12SiO2-5MgO，可以達到20%的減渣量與65.6%的脫硫性能;方案三40%還原碴回爐技術(53%還原碴+47%改質副原料配方)，且脫硫劑成份為52.2%CaO-22.5%Al2O3-10.8SiO2-10CaF2-4.5MgO，可以達到20%的減渣量與80%的脫硫性能，而脫硫率的增加起因於C2S相改質為C12A7相的結果。

Reduced slag is a by-product from refining desulfurization of electric arc furnace (EAF). Based on the statistics of the World Steel Association for Taiwan's average annual EAF steel production of 8.51 million tons from 2015 to 2022, it is estimated that approximately 170,000 tons of reduced slag are generated annually. However, its reutilization value is limited due to the high content of active calcium oxide. This study designs three environmentally friendly