The Production of Refractory Spinels from Magnesia and Alumina

Ceramurgia + Ceramica Acta
ISSN 1970-0393
(Publication ceased)

Formerly "Ceramurgia"
Volumes No. 1 - 32 - ISSN 0045-6152
E. Stamboliadis
Department of Mineral Resources Engineering, TUC, Chania, Grecia


Refractory MgAl204 is normally produced by pressing a mixture of MgO and Al2O3 powders to form green briquettes and making them react at elevated temperatures. The problems involved in the laboratory and industrial production of synthetic spinels to meet the requirements of the refractory industry are presented. The raw materials used, the stoichiometry, the impurities, the particle size and the production process influence the properties of the final product. The surface potential of alumina also affects the manufacturing process. The use of periclase as MgO source increases the density of spinel compared to natural magnesite (MgCO3). The packing density of the green magnesia and alumina mixture favors the production of a dense spinel. However the best product is obtained after regrinding the so formed spinel, making briquettes of spinel powder and firing again. The resistance of spinel to corrosion decreases as the alumina content increases.
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