Abstract
At present the calcining zone of rotary cement kilns in domestic plants is lined primarily with magnesia--spinelide refractories (magnesite-chromite, chrome-magnesite, and peric!asespinelide), which are characterized by relatively high heat resistance (not less than 8 according to GOST 21435-75 for magnesia--chromite cement parts) and temperature deformation under load (not less than 1540~ for periclase--spinelide cement parts). Their compressive strength is from 25 to 30 MPa. However, the service of a lining in rotary cement industry kilns has a number of specific features, one of which is the direct contact of the refractory with the material being calcined and their intense chemical interaction. Therefore, magnesia--spinelide refractories, in addition to good physicotechnical properties, must possess increased resistance to chemical reaction with the material being calcined.
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