熔融轉爐슬래그와 C3A(3CaOAl2O3)펠렛사이의 界面反應
The Interface Reaction Between Molten Converter Slag and C3A(3CaOAl2O3) Pellet
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초록
용융전로슬래그를 일반 포틀랜드 시멘트로 활용하기 위하여, 용융슬래그와 C3A(3CaO•Al2O3)가 반응하여 시멘트의 구성상인 C4AF가 생성되는 기구와 생성속도를 조사하고자 한다. 전로슬래그에 소정의 SiO2를 첨가하여 MgO도가니에 넣고 1300oC~1350oC에서 30분간 가열•용해하여 균질화 한 후, 같은 온도로 가열해 둔 소결 C3A펠렛을 투입하여 10~30분간 반응시켰다. 반응 후, 급냉한 시편을 도가니의 직경방향으로 절단해서 펠렛 단면의 C3A직경 변화를 측정하여 C3A의 용해속도를 조사하고, 계면반응 생성상을 SEM/EDX로 관찰하였다. 그 결과 C3A 펠렛의 슬래그로의 용해속도는 1300oC에서 0.75×10-4(cm/sec)으로부터 1350oC에서 1.67×10-4(cm/sec)으로 증가하였으며, 슬래그와 C3A 펠렛 사이에 C4AF와 C12A7의 혼합층이 생성됨을 알 수 있었다.
Abstract
As a basic study for recycling molten converter slag as an ordinary portland cement (OPC) by a conversion process, the reaction mechanism and the rate of the formation of C4AF which is one of the main components of OPC were investigated. Theconverter slag whose basicity was controlled by adding reagent grade SiO2 was melted and hold for 30 minutes in MgO crucibleat 1300oC~1350oC. Then, the sintered CaO pellet heated at the same temperature was dipped into the molten slag and hold for10~30minutes. After the reaction, the crucible was cooled in air and the specimen was cut off to the horizontal direction of thecrucible. The disolution rate of C3A pellet was measured by the change of radius of the sintered C3A pellet, and the formedphase of C4AF was observed by SEM/EDX. As a result, the dissolution rate of C3A pellet into molten slag was increased from0.75×10-4(cm/sec) at 1300oC to 1.67×10-4(cm/sec) at 1350oC, and the mixed layer of C4AF and C12A7 was found between slagand C3A pellet.
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