IMPROVING PROPERTIES OF MAGNESIA-SPINEL BRICKS FOR CEMENT ROTARY KILNS BY USING MICRO-FINE MgO PARTICLES

摘要

Micro-fine MgO particles were added to a standard magnesiaspinelrefractory brick formulation with the aim to improve thephysical properties of the fired bricks. The addition ofmicronized MgO particles lead to a higher bulk density, highercold crushing strength, lower apparent porosity and lower gaspermeability compared to reference magnesia-spinel bricks.Moreover, the hot physical properties refractoriness-under-load,creep-in-compression as well as the cold and hot modulus ofrupture were enhanced. A field trial was carried out in a cementplant to assess the performance of the improved bricks inservice.