A Silica Sol Combined Mullite Casting Material Suitable for Quick Repair of Industrial Furnaces

Abstract

The invention discloses a silica sol-combined mullite perfusion material adapted to rapid repair of an industrial furnace, which belongs to the refractory material technical field. The perfusion material comprises the following raw materials by weight: 50-60% of mullite granules, 10-20 % of mullite powder, 5-10% of white alundum powder, 4-15% of alpha-active alumina micro powder, 0.6-1.0% of magnesium oxide powder, 0.5-0.7% of dextrin, 10-16% of silica sol and 1-2% of dispersing alumina. The silica sol-combined mullite perfusion material is characterized in that the silica sol is individually packaged; other components are weighted according to ratio and mixed through mechanical stirring to uniform aggregates in a dry state; on construction site, the individually packaged silica sol and uniform aggregates in the dry state are weighted according to ratio, and uniformly mixed and stirred and pumped for construction. The perfusion material has the advantages of excellent physical and chemical property and good application property, pumping for construction can be used, manpower and material resources can be saved, rapid repair requirement for various industrial furnaces can be satisfied, and the perfusion material is the excellent repair refractory material with strong adaptability.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to an aluminum-silicon system that has special requirements for volume stability and thermal shock stability and is suitable for rapid repair of industrial furnaces, with good volume stability and good thermal shock stability. Fast curing, fast baking, high strength and excellent construction performance silica sol combined mullite castable. Background technique [0002] In the prior art, there is an annular gap between the blast furnace shell and the stave, and the design distance is generally 40-80mm. The height of a section of the stave is about 2m, and there are 4 water inlet and outlet pipes, as well as a galvanic protection pipe and a stave. Set bolts pass through. The narrow gap in this part needs to be filled with refractory materials with good air tightness, stable volume, fast curing speed and excellent construction performance. If the blast furn...

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Problems solved by technology

[0006] In the metallurgical industry, there are many thermal equipment similar to the above. In the prior art, the working linings are all made of aluminum-silicon refractory materials (resin-bonded cement-free press-in materials, low-cement castables, etc.), and the applicant believes that they are The damage mechanism is: due to the poor volume stability of the working lining refractory material, it cannot be quickly solidified with a grid structure (so it cannot be used for emergency repair projects), resulting in the volatilization of the binder in the working lining refractory material during the maintenance or operation of the equipment. Cracks appear, or cannot resist the damage of excessive temperature change internal stress and crack and peel off (due to the poor thermal shock resistance of the material), the equipment cannot operate normally, or the growth of strength depends on the curing time to complete (cement made binder), and after curing and curing, due to cement hydration, grain growth leads to increased body density, poor drainage channels, prolonging construction demoulding time and oven time, which is not suitable for rapid repair conditions

At present, there is no available technical solution that successfully solves the above technical problems and is suitable for the above conditions. It has good volume stability and thermal shock stability. It can be quickly solidified and baked quickly with a grid structure, with high strength and excellent construction performance ( pumpable construction) refractory products

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