... 9001-2008 3.high density Fused Magnesite Aluminia Spinel Refractory Material Fused magnesium aluminum spinel is produced by mixing the ... uniform structure, and there fore is the high-grade raw material for producing refractory products with high in density and good ... melting, cement rotary kiln and glass furnace, as the ideal material for manufacturing cast sliding plate, nozzle bricks, ladle bricks ...