Key Technologies for Energy Efficient Al(OH)_3 Dilute Phase Fluidized Bed Roasting Furnaces

摘要

Research on new types of castables, pre-cast assembly parts and thermal insulation materials with good resistance to wear, thermal shock and erosion, and low thermal conductivity, was 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 China's Al(OH)3 dilute phase fluidized bed roasting furnace lining. Several difficult problems such as the matching of different materials, preservation of expansion joints among different zones and reasonable mechanical distribution of lining were solved. "Integrated furnace" concept was established including refractories R & D, lining structure design, construction optimization, furnace warming technology, initial operation and lining maintenance technology. The key technologies of high-efficiency and energy-saving for furnaces were developed. These achievements have been applied to China's Al(OH)3 dilute phase fluidized bed roasting furnaces to reduce energy consumption by 1 000 MJ per ton alumina, enhance the capacity and reduce the exhaust gas emission.