The low thermal conductivity magnesia alumina spinel brick is produced with synthetic low thermal conductivity magnesia alumina spinel as the main material. Compared with the traditional magnesia alumina spinel brick, it contains closed pores inside, which reduces the thermal conductivity and bulk density, and realizes the energy saving effect. However, the corrosion resistance and wear resistance of the product have not decreased
The low thermal conductivity magnesia alumina spinel bricks supplied by our company have replaced the traditional magnesia alumina spinel bricks and silica fume bricks, and have been applied in the transition zone of the cement rotary kiln, which has achieved good energy saving effect. Taking the rotary kiln with a diameter of 4.8m * 70m as an example, the calculation shows that 6.164 tons of refractory bricks can be reduced every 10m, and the kiln load can be reduced by 6.164 tons, saving electric energy. At 700 ℃, the thermal conductivity of low thermal conductivity magnesia alumina spinel brick is 3.64w/m.k, and that of traditional magnesia alumina spinel brick is 4.62w/m k. The heat loss is effectively reduced. The application shows that the temperature of the rotary kiln shell is reduced by 30-50 ℃ after the use of low heat conduction magnesia alumina spinel brick, and the energy saving effect is obvious.
