폐 MgO-C 내화재의 제강 Flux로서의 사용성 평가

다국어 초록 (Multilingual Abstract)

In steelmaking processes, MgO-based refractories are widely used. Over time, these refractories need to be discarded. However, most steelmaking companies find it challenging to separate the refractories from impurities and lack the necessary equipment for this task, resulting in landfilling. This practice incurs transportation and landfill costs and can lead to soil pollution. This study aims to recycle waste MgO-C refractories as a flux in steelmaking to reduce these costs and prevent soil contamination. To achieve this, we analyzed the composition of commercial EAF slag and
established a target EAF slag composition based on this data. We then calculated the mixing ratios required to use waste MgO-C refractories as flux.
We compared the composition, basicity, viscosity, and slag foam height of EAF slag made using only calcined dolomite and quicklime as flux with EAF slag made using waste MgO-C refractories. The study found that using waste MgO-C refractories as steelmaking flux was feasible, as it provided appropriate basicity, viscosity, and slag forming effects, making it applicable in actual steelmaking processes. Furthermore, using waste MgO-C refractories as flux could potentially reduce the costs of auxiliary materials like calcined dolomite and carbon additives.

목차 (Table of Contents)

• Ⅰ. 서론 1
• 1. 연구 배경 및 필요성 1
• Ⅱ. 이론적 배경 3
• 1. 내화물의 개념 및 종류 3
• 2. 전기로공정 및 슬래그 6
• 3. 슬래그 포밍 현상 8
• Ⅲ. 실험 재료 및 방법 10
• 1. 개요 10
• 1) 성분 분석 11
• 2) 상용 EAF slag 기반 pre-melting base slag 및 target EAF slag 조성 설정 16
• 3) 실험 장비 21
• 2. 실험 구성 23
• 1) Pre-melting base slag 제조 24
• 2) Target EAF slag 제조 26
• 3) 폐 MgO-C 내화물 첨가에 따른 EAF slag의 염기도 및 점도 비교 28
• 4) EAF slag foam 높이 측정 29
• Ⅳ. 실험 결과 및 고찰 31
• 1. Pre-melting base slag 제조 31
• 2. Target EAF slag 제조 33
• 3. 폐 MgO-C 내화물 첨가에 따른 EAF slag의 염기도 및 점도 비교 39
• 4. EAF slag foam 높이 측정 41
• Ⅴ. 결론 44
• 참고문헌 46