The future direction of the development of refractory materials

Refractory products are mainly good or bad to see how the raw materials? Want to improve the performance of the current refractory products, we have to start from the raw materials. 2, efficient continuous casting and rolling system with refractory materials; 3, the use of refractory materials, 6, high-performance unshaped refractories; 5, to adapt to the new construction methods of refractory material; 6, cement, nonferrous metals, petrochemical and ceramics and other key industries and key parts with refractory materials; 7, there are Conducive to environmental protection and ecological resistance and so on.

    The future of refractory raw materials will be the main high-purity, natural selection and synthetic and use. Development and utilization of "three stone" raw materials, that is, andalusite, sillimanite, kyanite raw materials, can improve the aluminum-silicon refractory microstructure and thermodynamic properties. As the "three stone" at high temperature phase change to mullite, and mullite expansion coefficient is small, is conducive to improving the thermal shock resistance of the material. The addition of orarsalite to the material can form a number of fine voids in the thermal stress diffusion, so that the stress in the refractory material is released, thereby improving the thermal shock resistance. And the sillimanite completely mullitized the temperature is higher, is conducive to improve the high temperature creep resistance. In addition, the volume expansion effect associated with mulliteization is also favorable for high temperature creep resistance. The development of high-quality synthetic refractory raw materials, the use of natural raw materials in developed countries is declining, and the amount of high-purity synthetic raw materials is increasing, the reason is a large number of synthetic raw materials, the proportion of unshaped refractories is increasing, and extensive use of natural raw materials Brick, high alumina brick, zircon brick production is decreasing.

    In addition, due to the extension of the refractory service life has a higher demand, it should be used in large quantities to meet the requirements of high purity synthetic raw materials. Representative of several synthetic raw materials are as follows: 1, mullite-based clinker. With kaolin and industrial alumina as raw materials, the wet grinding, vacuum extrusion molding, and then made at high temperature, with good thermal mechanical properties, in the kiln and unshaped refractories has a good application prospects ; 2, Dong Qingshi clinker. With kaolin and magnesia as raw material, the wet grinding, vacuum extrusion molding, and then high temperature calcination, in the kiln has a good application prospects; 3, magnesium calcium clinker. As the development of clean steel, low carbon steel, high oxygen steel and stainless steel, making free calcium oxide containing alkaline refractories are being taken seriously; 4, eutectic composite fusible material. Alumina-based fused corundum, alumina-based fused mullite, alumina-based fused mullite - zirconia, fused corundum - zirconia, fused magnesia - zirconia and other synthetic raw materials have also been rapid development; 5, spherical dense hollow synthesis of mullite aggregate. The hollow shell wall thickness 0.2-5mm, diameter 1.5-40mm, the surface can be smooth and smooth, can also be uneven, spherical shell can be a single layer, it can be double, the surface of the prominent parts can be dense, it can be hollow Of its use in the castable, not only to improve the material insulation performance, reduce the bulk density, without breaking its strength. The challenges of the survival and development of the refractory industry are multifaceted and grim, mainly: 1, the user industry as a result of scientific and technological progress (such as iron and steel industry directly to iron technology, out of the furnace, to reduce molding, converter slag splashing, etc. 3, the user of the product quality and cost of the demanding requirements; 4, the user's risk to pass, the requirements of refractory suppliers to provide the design, production and sales of refractory materials, 6, due to the downturn in the industry, the decline and lack of refractory education in some countries, resulting in the lack of young professionals, the lack of quality and talent in the country, ; 7, the depletion of raw materials and so on.