The Key Technologies for Energy Efficient Al(OH) 3 Dilute Phase Fluidized Bed Roasting Furnaces

Research work on new types of castable refractory, pre-casted assembly parts and thermal insulation materials, with resistance to high wear, thermal shock and erosion and low thermal conductivity, were done to solve problems of high system energy consumption, cracking and spalling of partial lining and mismatch of furnace top material and hanging material and so on, caused by unreasonable design of domestic Al(OH)3 dilute phase fluidized bed roasting furnace lining. Several difficult problems such as the matching of different materials, preservation of dilatation joint between different zones and reasonable mechanical distribution of lining were solved. A full set of techniques including construction, furnace lining drying, lining maintenance and corresponding standards were developed according to the properties of lining materials and features of the furnace type. Using the ideas of furnace integration and new theory of furnace lining, we have solved the key technologies of high-efficiency and energy-saving for furnaces. The achievements have been applied to domestic Al(OH)3 dilute phase fluidized bed roasting furnaces to reduced energy consumption by one thousand MJ per ton of alumina, thus making a furnace lining with higher production, lower energy consumption and less exhaust gas emission.