1, the total amount of flux is high, especially Fe2O3, TiO2 content of SiO2 is high This is led to China's production of zirconia corundum brick poor quality of one of the main reasons, the impact of iron oxide on the crystallization of the characteristics of it to promote the formation of heterogeneous Of the coarse crystals, but also increase the glass content to reduce the glass phase precipitation temperature and thus reduce the corrosive properties of refractory glass. The role of TiO2 in the fused brick and Fe2O3 similar, it can also promote the crystal grow. The more the content of SiO2, the more glass-containing, the general requirements of 14% or less, to reduce the content of Fe2O3, TiO2 and SiO2 products, we must first improve the purity of raw materials, strengthen the mineral processing, vigorously build zircon sand Mine mine base, make ingredients melting process, annealing process, etc .... Reduce the glass content.

2. Mineral Ingredients: To improve the quality of fused refractories, add diamonds and corundum eutectoids to the mineral composition, increase the dendritic, bead-like oblique zircon, and reduce the isolated oblique zircon crystals. Mullite is best not, if any, should be less than 1%, the glass phase is best less than 20%.

3. Glass phase of the initial melting temperature: to improve the quality of domestic fused zirconia corundum brick, we must improve the domestic glass in the glass phase of the initial melting temperature, improve the glass phase of the initial melting temperature is to reduce the way of Fe2O3, TiO2 and carbon Content, increase the content of ZrO2 and Al2O3, to reduce the carbon content, it is recommended to use domestic oxidation brick melt oxidation method to produce fused zirconia corundum brick.

4. Microstructure; AZS brick particle size and distribution are not uniform, vertical oblique zircon single crystal more bead-like dendritic oblique zircon less, diamond-shaped discontinuous parallel distribution of oblique zircon and corundum More parallel distribution of oblique zircon and corundum eutectoid less, to improve the quality of domestic AZS brick, in terms of microstructure in addition to reducing the size of domestic brick mineral particles to improve the size of mineral particles and distribution of uniformity