Material for maintaining molten iron pretreatment tools online, preparation method and applications thereof

Abstract

The invention discloses a repairing material for maintaining molten iron pretreatment tools online, a preparation method and applications thereof. The repairing material comprises the following raw materials in parts by weight: 75 to 85 parts of Al2O3 containing used fireproof reclaimed material, 10 to 20 parts of fireproof clay, 0 to 5 parts of silicon carbide, 0 to 5 parts of dry quenching furnace dust-free coke powder, 3 to 6 parts of kyanite, 1 to 10 parts of binder, and 0.85 to 3.7 parts of additive. The weighed raw materials mentioned above are dry-mixed and evenly stirring in a stirring machine, and the mixture is directly packaged to obtain a finished product, namely the repairing <{EN0}>mMmaterial for maintaining molten iron pretreatment tools online. The cost of raw materials is low, the source of regenerated resources is wide, the repairing material is user-friendly, the repairing is convenient to carry out, the interface bonding strength of the repaired layers is strong, the anti-peeling performance is strong, and the repairing and maintaining effect is excellent.

Description

technical field [0001] The invention relates to the field of refractory materials for molten iron pretreatment before converter steelmaking, in particular to an on-line maintenance and repair material for molten iron pretreatment equipment and its preparation method and application. Background technique [0002] In order to meet the market's requirements for the quality of iron and steel products, continuously reduce the production cost of iron and steel products, and improve the market competitiveness of iron and steel enterprises, many iron and steel enterprises at home and abroad have carried out desulfurization or "three desulfurization" pretreatments on molten iron for steelmaking to optimize smelting. process, reduce production costs, and improve the quality of steel products. Even for the production of ordinary carbon steel, the sulfur content of molten iron in the furnace is required to be <0.020% to improve the final quality of steel products. It has been develop...

AI Technical Summary

Problems solved by technology

This patent not only failed to solve the problem of fast hardening speed of the binder itself under high temperature conditions, but further added magnesia, which further shortened the hardening time and could not guarantee the normal repair construction time

According to relevant reports at home and abroad, the repair material for online maintenance of hot metal pretreatment equipment is supplied in the form of mixed and rolled mud for on-site use. Due to the high ambient temperature of the hot metal pretreatment production site, the storage time of the repair material is greatly shortened. , at the same time, the amount of single repair fluctuates greatly, often the first generation of repair material is more rich in a single repair, and it will dry out when it is used again. The preparation of the binder aqueous solution brings difficulties to the actual production and application

[0004] Based on the above, it can be seen that domestic iron and steel enterprises all use refractory plastics for online repair of molten iron pretreatment equipment, and have achieved a certain effect in prolonging the service life of pretreatment equipment in actual production, but the related repair material technologies currently disclosed generally have interface bonding. Low strength, easy peeling of the repair layer, high price, difficult maintenance and repair construction, etc.