Turkey`s Magnesite for Production of Fused Magnesia, Properties and Uses in Refractory Applications

Cemalettin Yaman1, Nuri Sarioglu1, Asim Bilge2

1 Metallurgical and Materials Engineering Yıldız Technical University, Turkey
2 Kümas Manyezit Sanayi A.S, Kütahya, Turkey

Revision

Volume 10, Issue 1, Pages 72 - 76

Abstract

Magnesite (MgCO3) is natural source for production of caustic calcined, dead burned and fused mag­nesia. Turkey’s magnesite sources have a well­known reputation internationally with high purity, crypto­ crystalline structure and suitability for refractory applications. For high temperature processes, there is a great need for refractory raw materials that can withstand oxidative environment at elevated temperatures. Fused Magnesia (FM) is the most important material for these purposes with melting point 2800 °C and one of the key element of the refractory heat resistant materials especially for steelmaking refractory bricks. Fused magnesia is considered to be one of the best thermal and electrical insulators with high density, high purity and large crystals. FM is produced by electric arc melting of magnesite or CCM in a traditional Higgins furnace or in tilt­type furnace at >2800 °C. Quality of the electrically fused magnesia is determined by choosing magnesite source, benefciation processes, arc furnace electrical parameters and sorting. Final product were charac­ terized by using chemical analysis, scanning electron microscope and EDX. Samples from different process parameters were investigated according to their crystal size, bulk density and impurity formation.

Keywords

magnesite, fused magnesia

References

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