Lightweight high temperature resistant heat insulation board for metallurgy and preparation method thereof

Abstract

The invention discloses a lightweight high-temperature-resistant heat-insulating board for metallurgy and a preparation method thereof. The board comprises the following raw materials by weight: 10 to70% of vitrified microbeads, 10 to 70% of floating beads, 0 to 30% of magnesia, 0 to 20% bauxite cement, 0 to 8% of Guangxi white clay, 0.02 to 5% of a binder, 0 to 10% silica micropowder, 0 to 15% of pyrophyllite powder and 0 to 3% of quicklime. The preparation method comprises the following steps: uniformly mixing the desired amounts of the raw materials with water in a mixer to obtain a mixture; placing the mixture in a mold for vibrating formation to obtain a molded product; storing the molded product with a mold at room temperature for 8 to 48 h; then putting the molded product with themold into an incubator with a temperature of 50 to 80 DEG C and maintaining the product at the temperature for 8 to 24 h; and then carrying out demolding, and drying the molded product in a drying boxwith a temperature of 120-200 DEG C for 8 to 48 h so as to obtain the lightweight high-temperature-resistant heat-insulating board. The board provided by the invention has the characteristics of light weight, high strength, excellent heat insulation performance and the like.

Description

technical field [0001] The invention relates to a refractory material in the field of metallurgy, in particular to a light-weight high-temperature-resistant heat insulation board used in metallurgy and a preparation method thereof. Background technique [0002] In the iron and steel metallurgy industry, the thermal insulation performance of molten iron and molten steel containers such as molten iron tanks, ladles, and tundishes has been valued by various steel mills. The refractory materials of the original storage and transportation containers include permanent layers and working layers. The thermal conductivity of refractory materials in the working layer It is generally high, and the insulation effect is limited. The permanent layer is generally made of high-alumina bricks, clay bricks, and high-alumina castables. When the temperature of the steel shell reaches 300°C, the loss of heat energy is relatively large. Therefore, it is necessary to enhance the thermal insulatio...

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Problems solved by technology

[0004] 1) A 5-15mm composite heat-insulating reflector is added between the permanent layer and the steel shell. Its thermal conductivity (600°C) ≤ 0.055W / mK has excellent thermal insulation performance, but its operating temperature does not exceed 1000°C. The phenomenon of melting affects the service life of refractory materials for storage and transportation equipment, and there are potential safety hazards;

[0005] 2) Using lightweight castable as the permanent layer, the thermal conductivity (600°C) ≤ 2.0W / mK improves the thermal insulation performance to a certain extent, but the strength of the lightweight castable is low and the high temperature shrinkage is large;

[0006] 3) Use fired wax stone bricks as the permanent layer, the thermal conductivity (600°C) ≤ 1.6W / mK, the thermal insulation performance is average, and its service life is higher than that of ordinary permanent layers, but its cost is high and the cost performance is low;

[0007] 4) Lightweight refractory bricks are used as the permanent layer, the thermal conductivity (600°C) ≤ 0.8W / mK, the thermal insulation performance is good, but its strength is low, the life is lower than the general permanent layer, the cost is high, and the refractory material is greatly increased consumption cost

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