Preparation method of gunning mix for kiln repair

Abstract

The invention discloses a preparation method of a gunning mix for kiln repair. The preparation method comprises the following steps in sequence: breaking dead burnt magnesia into large dead burnt magnesia particles; grinding the large dead burnt magnesia particles into small dead burnt magnesia particles; grinding part of the small dead burnt magnesia particles into dead burnt magnesia fine powder with a particle size of 0.088mm; breaking forsterite into large forsterite particles; grinding the large forsterite particles into small forsterite particles with particle sizes of 0.1-3mm; weighting borax, inorganic salt, sodium tripolyphosphate and sodium hexametaphosphate, premixing the materials and conveying the materials to a mixing system after premixing; screening the materials according to the difference of particle sizes; filling the small particles and the micro powder into a mixing system tank and conveying the materials to the mixing system after the materials are mixed; stirring dead burnt magnesia, forsterite, borax, inorganic salt, sodium tripolyphosphate and sodium hexametaphosphate in the mixing system simultaneously and then subpackaging the product, thus obtaining a finished product of the gunning mix. The preparation method has the beneficial effects that the formula is simple, thus reducing the inventory costs of the raw materials; the prepared product has a high adhesive rate, thus lowering the production cost.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to the improvement of a method for preparing 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...

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