Gunning mix for kiln repair

Abstract

The invention discloses a gunning mix for kiln repair. The gunning mix is characterized by comprising the following components by mass percent: 37-41% of dead burnt magnesia, 56-61% of forsterite, 1.0-1.4% of borax, 0.4-0.6% of inorganic salt, 0.2-0.4% of sodium tripolyphosphate and 0.4-0.6% of sodium hexametaphosphate. The gunning mix has the beneficial effects that forsterite and dead burnt magnesia are adopted as main raw materials; the gunning mix prepared with the formula has the advantages of high adhesive rate, good antistrip performance, high sintering speed, erosion resistance, anti-scouring performance and low high-temperature expansibility when applied to kilns and thermal equipment, and has more than 95% of adhesive rate; the mineral resources of the raw materials including magnesia and forsterite are abundant and the auxiliary raw materials can be obtained everywhere, so that the formula is simple and the inventory costs of the raw materials are reduced; the high adhesive rate of the product is favorable for not only achieving reduction of the production cost but also reducing the adverse effects of residues on molten steel.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a gunning material for repairing kilns. Background technique [0002] Metallurgical industrial kilns, thermal equipment and structures, due to long-term work in high-temperature environments, have serious wear and tear. Therefore, gunning materials must be used to repair them after a period of use to meet the needs of normal use. [0003] At present, there are various types of gunning materials. Although they all have a certain repairing effect, there are many deficiencies in their adhesion, cohesiveness, strength and sintering properties, as follows: [0004] 1. High material consumption: The gunning material used in the current steelmaking has a low adhesion rate, and the adhesion rate is less than 80%. In the consumption of refractory materials per ton of steel, the consumption of sprayed lining material accounts for about 25%, causing a lot of waste , increased production costs; ...

AI Technical Summary

Problems solved by technology

[0006] 3. Immature technology: product adhesion, cohesiveness, strength and sintering are more or less the same, there is no mature product that can fully meet the technical requirements, and there are many products, but the adaptability and applicability are not strong due to the influence of the environment and construction technology