리튬 슬래그를 친환경 건설재료로 활용하기 위한 특성 분석: 문헌 검토

초록

This paper investigated the potential of lithium slag, a major by-product of the spodumene ore refining process, as a sustainable cement substitute. The chemical composition of lithium slag was found to be similar to that of fly ash, containing SiO₂, Al₂O₃, and CaO. Furthermore, it was found to contain a significant amount of amorphous aluminosilicate phase. It is anticipated that its use as a cement substitute in construction could provide environmental and economic benefits by reducing landfill waste and cement consumption. Analysis of previous studies suggests that the addition of lithium slag significantly reduces the heat of hydration, which could be beneficial for controlling thermal cracking in mass concrete structures. However, the irregular and porous nature of lithium slag particles tends to reduce the fluidity of the new mixture. The optimal replacement ratio for compressive strength is approximately 20%, and at this ratio, the compressive strength becomes similar to or slightly higher than that of conventional concrete as the curing age increases. When this ratio is exceeded, the strength tends to decrease due to the dilution effect, and the pozzolanic reaction of lithium slag is slower than the cement hydration reaction, so the initial strength development is delayed, but it can be confirmed that it contributes to the increase in strength and microstructural improvement in the long term.

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