INNOVATIVE TECHNOLOGY FOR THE PRODUCTION OF PERICLASE-SPINEL MATERIALS

The paper considers the features of the development and production of periclase spinel refractory materials for lining rotary cement kilns operating under conditions of intensive thermal, mechanical and chemical loads. The lining of rotary kilns, especially in the zone of maximum temperatures, is subjected to intense influence from a number of destructive factors: high-temperature loading, mechanical abrasion due to clinker movement, chemical interaction with melts, and stresses associated with structural changes in the material. The feasibility of replacing periclase chromite refractories with periclase spinel refractories is substantiated in connection with environmental restrictions associated with the formation of toxic hexavalent chromium. The influence of the composition of the multicomponent system MgO–Al2O3–FeO–TiO2 on the formation of the structure and properties of materials is investigated. Particular attention is paid to the role of the spinel phase in ensuring heat resistance, strength and the ability to form a protective armor layer. It has been established that the introduction of modifying additives into the charge composition increases the material's resistance to the thermomechanical and corrosive effects of the operating envir-?nment. This is achieved through the formation of a specific dissipative microstructure and a complex of interacting phases that partially compensate for the excess energy effect, ultimately preserving the integrity of the refractory structure. It has been established that the introduction of ilmenite concentrate into the composition of the modifier contributes to the densification of the material after firing and increasing its corrosion resistance. According to the results of the studies, it was established that the materials' physical and technical characteristics meet the requirements for periclase spinel materials intended for lining the high-temperature zones of rotary cement kilns.