A red mud based anti-adhesive for metallurgical vessels and its preparation method and application

Abstract

The present application relates to the technical field of steel metallurgical auxiliary materials, in particular to a red mud-based anti-adhesive for metallurgical vessels and a preparation method and application thereof. The anti-adhesive comprises 75-85 parts of Bayer red mud, 5-15 parts of silicon nitride and 5-15 parts of borax. The red mud is pretreated by drying, grinding and sieving to a particle size of 200-250 mesh and a water content of less than or equal to 3 wt%; the purity of the silicon nitride is greater than or equal to 95%, and the alpha-Si3N4 is greater than or equal to 90%; the borax is industrial borax decahydrate. During preparation, the components are uniformly mixed according to the proportions, and water is added to adjust the viscosity of the slurry to 5-8 Pa·s. During construction, the inner wall of the vessel is cleaned and preheated to 80-100 DEG C, and the slurry is coated to a thickness of 1-3 mm, and a protective layer is formed after drying and curing. Through the synergistic effect of "skeleton support-glass phase filling-chemical bonding", the amount of slag adhesion is reduced by more than 72%, and the cleaning cycle is extended to 30-40 heats. The present application has low cost, can consume 0.8 tons of red mud per ton, and has no secondary solid waste discharge.