Indonesia customer order 300 tons refractory castable.
Based on the application and development of traditional high-aluminum and high-strength castables, the formula system of kiln mouth castables has changed greatly. It is a high-performance low-cement castable with the main features of adding high-efficiency water-reducing agent and ultra-fine powder. On the basis of the traditional high-aluminum castable formula, corundum-silicon carbide castables, andalusite-based low-expansion castables, and corundum-mullite high-strength low-cement castables using composite aggregates were gradually evolved. The reduction in the expansion coefficient of the castable can effectively suppress the internal stress of the material in high temperature environments, thereby improving its volume stability and thermal shock resistance; after adding ultrafine powder and additives to the new formula, its overall performance can be improved Significant improvement, thereby extending its service life from the previous 4 to 6 months to 10 months or even more than 1 year.
For a long time, the use of coal injection pipe castables has been difficult to achieve expected results due to harsh operating conditions, which to some extent has restricted the normal operation of cement kilns. At present, the castables for coal injection pipes are mainly aluminum-silicon carbide castables and corundum-spinel castables. The former adds ultrafine powder and silicon carbide to high-aluminum raw materials. The addition of silicon carbide improves the thermal shock resistance of the material. , and forms a liquid phase layer on the surface of the material at high temperature, which improves the alkali resistance of the material and greatly increases the service life of the material; corundum-spinel castable is made by adding Al2O3 powder and aluminum-rich spinel fines to the material. Powder has high high-temperature flexural strength. Spinel itself has certain alkali resistance, and has also achieved certain results in coal injection pipes. The development and application of these new products and new technologies have increased the service life of coal injection pipes from the previous 3 to 4 months to the current 6 to 8 months.
Progress in prefabrication of refractory castables
Prefabrication is another main direction for the development of amorphous refractory materials. Various special-shaped parts are poured and dried in the production workshop and then transported to the site for installation. This method is prone to problems during the baking process when low-cement castables are poured on site. Burst diseases can be effectively avoided, quality problems caused by irregular construction are greatly reduced, the service life of refractory materials is improved, and the construction cycle is effectively shortened. At present, some cement plants choose prefabricated parts to replace traditional castables in grate cooler throats, tertiary air duct gate valves, grate cooler low walls, etc., and have achieved ideal results. Based on the analysis of the advantages of prefabricated parts such as easy maintenance, no need for baking, and good use effects, it is bound to be widely promoted and applied as a unique solution in future development.
Development of construction technology of unshaped refractory materials
Compared with traditional techniques, spraying construction (including wet spraying and dry spraying) has significantly improved construction efficiency due to its high degree of mechanization, thereby improving economic and social benefits for cement production companies by compressing the production cycle. Benefits have been significantly improved. Using spraying technology for construction, the process can effectively avoid the impact of human factors on construction quality, and the product quality is stable, which improves the service life of refractory materials.