Corundum (mullite) wear-resistant refractory castable is made of corundum and mullite as the main material, plus a special matrix and binder. The product has high strength wear resistance, erosion resistance, erosion resistance, good high-temperature volume stability, and thermal shock resistance. Mainly used for the wear-resistant lining of large CFB boilers with special requirements and lining of other high-temperature furnaces.
Mullite castable is made of porous mullite aggregate as raw material, plus fine powder and additives. The critical particle size of mullite aggregate is 12mm, and the long-term use temperature is 1350 degrees.
Product features of mullite castables
The mullite castable has a high temperature and can be used as a working lining in direct contact with the flame to achieve high temperature and energy saving. The unit density is light, the structural weight is reduced by 40-60%, and the hidden danger of broken bricks is eliminated. Low thermal conductivity, porous mullite aggregate ingredients, low thermal conductivity, and good thermal insulation performance. The oven can be quickly baked, shortening the oven construction period, and the economic benefit is high.
Product application of mullite-corundum castables
Mullite castables are used in the petrochemical industry in tubular heating furnaces, light diesel oil, ethane cracking furnace linings, atmospheric and vacuum furnaces, and sulfur recovery devices. Steam boilers, tortoiseshell mesh insulation layer, two-piece cylinder and pipeline insulation single layer, other industrial furnace doors, fire holes, observation hole door linings, etc.
The aggregate of the mullite-corundum castable is high-purity fused mullite produced by our castable manufacturer, and the fused white corundum fine powder produced by our factory is used as the main matrix material. And introduced a small amount of active silica fume (SiO2 micro powder recovered from the ferroalloy factory), kyanite powder, and additions such as sodium tripolyphosphate or sodium hexametaphosphate. Based on initial success in use in steel company pellet furnaces. We also prepared mullite-corundum low-cement castable precast blocks for a large-scale pellet furnace of a steel company. It was built in the hot spot of the combustion chamber of the pellet furnace and the corresponding combustion chamber built with high alumina bricks was used for a comparative use test. After three months of ignition operation, the masonry of the combustion chamber built with high-alumina bricks peeled off seriously, and local fires occurred. The mullite-corundum prefabricated block masonry of the corresponding combustion chamber is intact, and there is no peeling phenomenon. The combustion chamber built with high alumina bricks was re-ignited and operated for 6 months after cold repair and was observed after being forced to shut down for maintenance due to mechanical failure. The high-alumina brick masonry has been peeled off in a large area and is seriously damaged. The corresponding mullite-corundum castable precast block masonry has not found obvious signs of spalling.
Rongsheng Unshaped Refractory Castable Manufacturer
Compared with pure corundum castables and high alumina bricks, mullite-corundum castables and prefabricated blocks have better thermal shock resistance and spalling resistance. It is a new type of refractory castable and prefabricated block worthy of promotion when used at high temperatures with severe thermal shock, and it can be expected to obtain better results. Rongsheng refractory manufacturer provides high-quality monolithic refractory lining solutions for industrial furnace linings. Our environmentally friendly advanced monolithic refractory castable production line has an annual output of 6W tons. Contact us for free refractory castable configurations, quotes, and samples. The quality of our products never disappoints customers.
