Application of fly ash in light insulation refractories
Physical characteristics of fly ash Fly ash is a kind of volcanic ash active material, the color is related to impurities, generally grayish white, grayish black, and specific. The density of fly ash varies depending on the shape and size of the particles. Usually 1.9 to 2.4 g/cm2.2 The chemical composition of fly ash floating beads The homologous material of fly ash. The hollow drift beads have excellent heat resistance, heat insulation, Insulation and other properties, is a raw material and filler material with many uses. Drift beads are filled with 41%, and their physical and chemical properties vary depending on the type of coal used in the power plant, the state of coal combustion, and the mode of combustion.
The composition of the chemical composition of fly ash floating beads at home and abroad is composed of 80-85% of silicate glass phase, 10-15% of mullite, and 5% of other minerals (including quartz variants). ); Refractoriness of float beads varies with Al content, Al content is 25% 2.3 Thermal change of float beads According to relevant data, from room temperature to 1000°C, float ball changes and its chemical composition does not change; from 1000°C Cristobalite crystals began to appear, the sphere began to shrink; crystallization at 1200°C was evident; during the period from 1200 to 1250°C, the mullite content formed by Al in the material was trending towards 4/2002 fly ash stabilized, and the cristobalite content also reached a high value. Drift ball sphere deformation is significant, and the spheres are bonded to each other; when the temperature reaches 1300° C. or more, the degree of fusion of the silicate glass phase in the float beads is intensified and the blank is burnt.
The physicochemical properties of the raw materials of lightweight high-strength insulating bricks fluctuate greatly depending on the type of coal and the operation method, and can be classified according to the production conditions of the factory to facilitate the use of beads.
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