Guimo brick for cement rotary kiln and preparation method of Guimo brick

Abstract

The invention relates to a Guimo brick for a cement rotary kiln and a preparation method of the Guimo brick. A casting material is prepared from alumina, white corundum, silicon oxynitride, alpha-Al2O3, metal silicon powder, an antioxidant, an additive and a binder. When the Guimo brick is used, the joint is more tightly built, and the bricks are firmly connected with each other and are integrallystressed, so that bearing capacity is high; each Guimo brick is internally provided with a cavity, so that self weight is small, and the practical service life is ensured. According to a heat-resistant material of a first temperature-resistant layer and a second temperature-resistant layer on two sides of the transition zone brick of the cement rotary kiln, the characteristics that silicon oxynitride has good thermal shock stability and good erosion resistance on cement materials and salts are utilized, and simultaneously the principle that molten SiO2 and silicate and molten non-ferrous metals such as Al, Cu and the like do not infiltrate silicon oxynitride ceramic is utilized, so that a transition zone brick, made of the brick, of the cement rotary kiln does not generate kiln coatings easily. A heat insulation layer with a heat insulation cavity is adopted between the first temperature-resistant layer and the second temperature-resistant layer, so that heat insulation capacity is high, the heat conductivity coefficient is small, the temperature of a kiln cylinder is prevented from being high, energy consumption is low, and cost of the cement kiln is reduced.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a silica brick for a cement rotary kiln and a preparation method thereof. Background technique [0002] In the early days, superphosphate bricks, anti-flaking and wear-resistant bricks were used for the working lining of the cement kiln transition zone until the current silica bricks. The current silica bricks mainly use high-alumina bauxite clinker, high-quality silicon carbide as raw materials, and syrup as a binder. The thermal shock performance is unstable, and the oxide layer is deep after firing. The auxiliary kiln skin in the transition zone of the cement kiln falls off frequently, the temperature changes greatly, and the chemical erosion is severe. The refractory bricks are easily cracked, peeled off and damaged by ablation. [0003] Therefore, the thermal shock stability of silica bricks is extremely important. With the advancement of cement rotary kiln te...

AI Technical Summary

Problems solved by technology

With the advancement of cement rotary kiln technology, it is developing in the direction of large-scale, high wind and high pressure, the kiln speed is accelerated, the material flow rate is increased, and the temperature rises, which has seriously affected the service life of the silica molybdenum bricks used in the cement rotary kiln.

[0004] The existing silica molybdenum bricks used in cement rotary kilns have poor stability. When they are used in the later stage, their self-heavy weight will easily cause insufficient load-bearing capacity of the kiln body and affect the practical life; and their thermal stability is poor, and their ability to resist cement materials and salt erosion is insufficient; The bricks in the transition zone of the rotary kiln are easy to hang on the kiln skin, and the frequent shedding of the kiln skin will cause damage to the bricks caused by temperature changes, reducing the life of the cement kiln

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