Mudi, Priyanka and Kundu, Madhurima and Tripathi, H. S. (2025) Sintered Magnesia from Sea Bittern-Derived Magnesium Hydroxide for Refractory Applications. In: National Seminar on Ceramic and Glass Technology in the Modern Era: Challenges, Opportunities and Sustainability (CGTME-2025), 8-9 August 2025, CGCRI Kolkata. (Submitted)

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Abstract

Magnesia is a crucial basic material for the refractory industry. Its high melting point, excellent corrosion resistance under basic environment, and good thermal conductivity make it an ideal choice for high-temperature applications in steel, cement, and glass industries etc. Sea bittern, a concentrated byproduct generated during the extraction of common salt from seawater, is rich in magnesium salts. Magnesium hydroxide derived from sea bittern presents a promising alternative raw material for high-purity magnesia production, particularly for refractory applications In this study, magnesium hydroxide samples extracted from sea bittern by CSIR-CSMCRI were used as starting materials. Sintered magnesia was developed using these hydroxides in the presence of TiO₂ as a sintering aid. The green compacted samples were sintered at temperatures ranging from 1600 °C to 1700 °C, with a 2-hour soaking time at peak temperature. The fired samples were evaluated for apparent porosity, bulk density, refractoriness under load (RUL), creep resistance, phase development, and microstructure. X-ray diffraction (XRD) analysis confirmed periclase as the major phase, with very small amount of secondary phases. Both the sintering temperature and TiO₂ content significantly influenced magnesia grain growth, with a marked increase in grain size observed as TiO₂ content increased. Sintered sample exhibits a well-developed microstructure with uniform grain size. Refractoriness under load of the refractory shapes developed from sintered magnesia is >1700 °C

Item Type:	Conference or Workshop Item (Lecture)
Uncontrolled Keywords:	Refractory, grain growth, magnesia, additives, densification, sintering
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/5810

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