Das, Aditi and Bhardowaz, Aarya and Dana, Kaushik and Sinhamahapatra, Somnath (2025) A Sustainable Strategy to Maximize the Utilisation of Spent MgO-C Refractory. In: International Conference on Research Advancements and Industrial Challenges in Glass and Ceramics (RACGC 2025), November 27-29, 2025, IIT Bombay, Mumbai. (Submitted)

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Abstract

With the global generation of spent refractory materials reaching approximately 28 million tons annually, the development of sustainable recycling methods has become crucial. This study proposes a strategic approach for the maximum utilization of waste MgO-C refractories into high-value refractory blocks promoting circularity in refractory applications. Spent MgO-C bricks were first characterized via Chemical Composition,XRD,CHNS analysis to understand phase distribution and elemental composition. Optical microscopy and XRD revealed that coarser aggregates (1–5 mm) predominantly consist of periclase, while finer fractions contain phases such as periclase, forsterite, monticellite, spinel, and quartz, along with increased carbon content. After size-based separation and recycling, recycled aggregates were incorporated into MgO-C block formulations by gradual replacement of fresh magnesia aggregates(0–50 wt%).For physiochemical and mechanical properties, Apparent porosity, Bulk density, Cold compressive strength (CCS) has been evaluated of the recycled MgO-C blocks and results showed that 40% replacement gave the most favorable result compare to the reference sample. So, mechanical and thermal properties were further investigated for the 40% replacement batch. Although CMOR performance decreased slightly compared to the reference, HMOR performance improved. SEM analysis of CMOR-fractured samples revealed crack propagation along grain boundaries in the recycled sample. The 40% recycled blocks also retained comparable residual strength after five thermal shock cycles. Additionally, slag corrosion tests indicated slightly higher surface interaction for the recycled sample, but no severe degradation was observed. This comprehensive study demonstrates that recycled MgO-C aggregates can be effectively reused in refractory production without significant compromise in functional properties and without any thermal treatment.

Item Type:	Conference or Workshop Item (Poster)
Uncontrolled Keywords:	Recycling, Spent Refractory, periclase, MgO-C aggregates
Subjects:	Refractories
Divisions:	Refractory
Depositing User:	Ms Upasana Sahu
Date Deposited:	12 May 2026 17:02
Last Modified:	12 May 2026 17:02
URI:	https://cgcri.csircentral.net/id/eprint/5807

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