Comparative Studies on Synthesis and Characterization of Titania and Iron Oxide Doped Magnesia from Indian Salem Magnesite

Sukriti Manna,Tamoghna Chakrabarti

doi:10.4236/msce.2016.47010

Sukriti Manna, Tamoghna Chakrabarti

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https://doi.org/10.4236/msce.2016.47010

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Abstract

Sintering, densification, and characterization of Salem Magnesite with Titania (TiO2) and Iron Oxide (Fe2O3) addition have been carried out in this work. Salem Magnesite samples with 2 wt.% TiO2 and Fe2O3 addition have been sintered in the temperature range of 1550?C - 1650?C. The sintered sample has been characterized in terms of physico-chemical properties like bulk density, apparent porosity, specific gravity and structural properties by X-ray diffraction and scanning electron microscope (SEM). Salem magnesite samples with 2 wt.% TiO2 and Fe2O3 addition have been densified to the specific gravity of 3.75 and 3.41 g/cc respectively after sintering at 1650?C and 2 h. The presence of Calcium Titanate (CaTiO3) phase at the grain boundary has been observed in the case of TiO2 addition. For Iron Oxide addition, precipitation of “Y” shaped magnesium ferrite spinel has been observed inside the grains. Finally, TiO2 addition in Salem Magnesite shows better densification compared to both as received Salem Magnesite and Salem Magnesite with Fe2O3 addition.

Highlights

Magnesia (MgO) based refractories have been a subject of continuing interest because of its high melting pointHow to cite this paper: Manna, S. and Chakrabarti, T. (2016) Comparative Studies on Synthesis and Characterization of Titania and Iron Oxide Doped Magnesia from Indian Salem Magnesite
Salem Magnesite contains a significant amount of impurities
With TiO2 Addition In Magnesite with titania addition, asmall increase in specific gravity with an increase in sintering temperature is observed whereas bulk density remains similar

Summary

Introduction

Magnesia (MgO) based refractories have been a subject of continuing interest because of its high melting pointHow to cite this paper: Manna, S. and Chakrabarti, T. (2016) Comparative Studies on Synthesis and Characterization of Titania and Iron Oxide Doped Magnesia from Indian Salem Magnesite. Chakrabarti (2858 ̊C), high chemical inertness against both acidic and basic slags, low thermal expansion (CTE) values at elevated temperatures and benign ecological characteristics [1]-[3]. It is widely used in various applications such as steel ladles, cement rotary kilns, vacuum induction furnaces, continuous casting tundishes, degasser snorkels and lances and glass industries [4]. Though a very high melting point of the refractory material is essential for high-temperature applications, lower temperature processing is always preferable to reduce processing expenses. Several authors have reported that the small additions (often less than 2 wt.%) of another material can have a very marked effect on the densification, grain growth and other characteristics of Magnesia refractory [6]-[9]

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