Periclase-spinel refractories from beneficiated materials

Abstract

Magnesite and magnesite-chromite powders obtained on the basis of beneficiated Satkinsk magnesite using the flotation method can be employed for making periclase-spinel refractories similar in quality to products of grade PShSO and PShSP. For such refractories there is typically an increased refractoriness under load of 2 kg/cm2, which on average equals 1640–1670°C. The periclase-spinel products made from beneficiated materials contain 4–5% silicates instead of 8–12% in the refractories obtained from ordinary powders. In the high-temperature fired periclase-spinel refractories made from beneficiated materials we note the formation of high-quality structures containing about 50% direct intergranular bonds between the highly refractory minerals. In the structural elements of such refractories there is a predominance of intergranular bond of the type periclase-secondary spinel-periclase.