Inorganic intercalated vermiculite insulation refractory material and preparation method thereof

Abstract

The invention relates to an inorganic intercalated vermiculite insulation refractory material and a preparation method thereof. In the technical scheme, the preparation method comprises the following steps: calcinating and activating raw vermiculite ore for 2-8 hours at the temperature of 500-650 DEG C, modifying for 2-10 hours in acid solution of 0.1-1.0mol / l, eluting and drying; preparing 2-5 weight percent of suspension with the eluted and dried vermiculite and poly-hydroxy-aluminum cation precursor solution, stirring for 4-8 hours at the temperature of 80-100 DEG C, eluting and drying, thereby obtaining poly-hydroxy-aluminum cation precursor intercalated vermiculite; calcinating the poly-hydroxy-aluminum cation precursor intercalated vermiculite for 4-6 hours at the temperature of 500-650 DEG C, thereby obtaining inorganic intercalated vermiculite; and finally mixing 40-80 weight percent of inorganic intercalated vermiculite and 20-60 weight percent of forsterite, adding 10-20 weight percent of aluminium dihydrogen phosphate, forming through stirring and pressing, and carrying out heat treatment at the temperature of 500-650 DEG C, thereby obtaining the inorganic intercalated vermiculite insulation refractory material. The invention has the advantages of low heat conduction coefficient at high temperature, high strength and wide application scope.

Description

technical field [0001] The invention belongs to the technical field of heat-insulating refractory materials, and in particular relates to an inorganic intercalated vermiculite heat-insulating refractory material and a preparation method thereof. Background technique [0002] It is an effective way to save energy by researching and developing high-quality heat-insulating refractory materials and using them reasonably in industrial kilns. It can not only increase the life of the kiln, but also improve the quality of products, reduce heat loss, improve heat energy utilization efficiency and reduce energy waste, so as to achieve the purpose of saving energy and reducing product costs. Therefore, the demand for effective high-temperature insulation materials is becoming more and more urgent. [0003] Vermiculite is a dioctahedral or trioctahedral aluminosilicate mineral with a 2:1 structural unit layer and exchangeable cations and water molecules between the layers. The interlay...

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Problems solved by technology

[0005] However, due to the large high-temperature expansion rate of the expanded vermiculite obtained through thermal modification, the interlayer spacing increases, and the through-holes between the layers lead to a decrease in the compressive strength of the heat insulation material, and the strength decreases with the decrease of the bulk density. And as the temperature rises, its thermal conductivity increases rapidly, so that it is difficult to increase the use temperature of the heat insulation material, especially the thermal conductivity is still high or the vermiculite product occupies a large volume, which limits the application range