Light-weight refractory material and preparation method thereof

Abstract

The invention provides a light-weight refractory material which is spherical particles and prepared from the materials in weight percentage: 2 to 10% of 0.001 to 0.0074mm starch, 70 to 80% of 0.1 to 1.5mm sawdust, 5 to 10% of 50 to 100 nanoscale aluminum oxide powder and 5 to 10% of 50 to 100 nanoscale electric smelted spinel powder.

Description

technical field [0001] The invention relates to a refractory material, in particular to a lightweight refractory material used in the production of castables for ladle permanent layers. Background technique [0002] The ladle permanent layer castables in the ladle must not only withstand high temperature, but also have a good heat preservation effect. Therefore, it is necessary to add lightweight refractory materials in the production process of the ladle permanent layer castables, thereby reducing the volume of the ladle permanent layer castables Density, so as to play a good role in heat preservation. [0003] In the prior art, alumina hollow spheres are mainly added to achieve the above functions. Since the alumina hollow spheres have a hollow structure, when they are added to the ladle castable and vibrated during construction, the hollow spheres are easy to float to the upper part of the castable, resulting in pouring The distribution of the hollow ball particles in th...

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Problems solved by technology

[0003] In the prior art, alumina hollow spheres are mainly added to achieve the above functions. Since the alumina hollow spheres have a hollow structure, when they are added to the ladle castable and vibrated during construction, the hollow spheres are easy to float to the upper part of the castable, causing pouring The distribution of the hollow ball particles on the upper and lower parts of the material is uneven, which leads to the difference in the thermal insulation performance of the ladle at different heights (the height of the ladle is 4-6m), which affects the thermal insulation effect; It is easy to break the wall during the mixing process of the castable, once the wall is broken, it will affect the thermal insulation performance of the castable

[0004] In the prior art, foamed plastic particles are often added to the castable material of the ladle permanent layer to replace the aluminum oxide hollow sphere particles. However, the foamed plastic particles will form a large amount of toxic gas at high temperature, which has caused great harm to the human body and the environment. big pollution

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