Micro-porous mullite-silicon carbide multiphase fire resistant material and preparation method thereof

Abstract

The invention relates to a micro-porous mullite-silicon carbide multiphase fire resistant material and a preparation method thereof. The micro-porous mullite-silicon carbide multiphase fire resistant material comprises the following ingredients: 25-30 wt% of super-grade bauxite particles having a particle size of no less than 1 mm and less than 3 mm, 24-27 wt% of super-grade bauxite particles having a particle size of no less than 0.1 mm and less than 1 mm, 10-15 wt% of SiC particles having a particle size of no less than 0.1 mm and less than1 mm, 10-15 wt% of super-grade bauxite fine powder having a particle size of less than 0.074 mm, 5-10 wt% of andalusite fine powder having a particle size of less than 0.088 mm, 2-5 wt% of pyrophyllite fine powder having a particle size of less than 0.088 mm, 3-5 wt% of active alpha-Al2O3 micro powder, 3-5 wt% of SiO2 micro powder, 4-6 wt% of Guangxi white clay, 1-3 wt% of elemental Si powder, and 1-2 wt% of Al powder, 1-2 wt% of dextrin, 0.4-0.6 wt% of calcium lignosulphonate, and 2-4 wt% of water. The micro-porous mullite-silicon carbide multiphase fire resistant material is prepared by mixing the ingredients, aging the mixture, moulding, drying and sintering. The prepared material has a uniform structure, has the average aperture less than 5 mum, has the characteristics of high strength, wear resistance, good thermal insulation performance, and excellent anti-alkali, chlorine, and sulfur compound erosion performance, and can meet the requirement of novel dry method cement production.

Description

technical field [0001] The invention belongs to the field of refractory materials, and in particular relates to a microporous mullite-silicon carbide composite refractory material and a preparation method thereof. Background technique [0002] Mullite-silicon carbide composite refractories are widely used in the upper and lower transition zones and secondary firing zones of new dry-process cement rotary kilns. The new dry process cement production technology has greatly improved the thermal efficiency and output of the cement production system, and promoted the development of cement production in the direction of high quality, high efficiency, large-scale and automation, representing the trend of cement production in the world today. However, in the new dry process cement production technology, not only the rotary kiln diameter is large, the kiln speed is fast and the kiln temperature is high, the thermal stress and mechanical stress of the material are very large; Alternat...

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Problems solved by technology

[0003] "Simo red bricks for large cement kilns and its manufacturing method" (ZL 200610097276.1) patented technology, using super-grade bauxite aggregate, silicon carbide, fused white corundum powder and andalusite powder as main raw materials to make silico red bricks, Although the heat insulation effect is good, its firing temperature is high, and its resistance to gaseous alkali, chlorine, and sulfur compounds is still poor

"High-strength and dense silica molybdenum brick and its production method" (CN200910095683.2) patented technology and "special silica molybdenum brick" (CN201010288841.9) patented technology, the prepared silica molybdenum brick has high compressive strength and thermal shock stability Good, but its corrosion resistance to alkali, chlorine and sulfur compounds is also poor

"A Silica Brick" (CN201010143497.4) patent technology, although the prepared silica brick has high strength and good heat preservation effect, it also does not solve the problem of poor corrosion resistance of gaseous alkali, chlorine and sulfur compounds

The patented technology of "Simo Wear-resistant Composite Brick" (ZL 200610128393.X) and the patented technology of "A Simo Structure and Heat Insulation Integrated Composite Brick and Its Preparation Method" (CN201010192172.5) mainly solve the problem of reducing the heat dissipation of the cement rotary kiln. problem, but it also does not solve the problem of poor corrosion resistance of gaseous alkali, chlorine and sulfur compounds