Abstract：Experiment was conducted in a self-prepared kg-scale high temperature fluidized bed for kinetics of 1 mm~3mm ore fine reduction with hydrogen. The utilization degree of gas decreases with reaction, which shows that the reaction is rapid during the beginning of deoxidation process, while slower with time. The higher the reaction temperature, the more the utilization degree of gas, but the difference of utilization degree at various temperatures shortens with time. The utilization degree of gas is 9%, and the metallization degree reaches 84% for 20min deoxidation process at 750℃，which shows the deoxidation reaction with hydrogen is very rapid. The almost linear increases of metallization degree with gas velocity, which shows the deoxidation reaction with hydrogen is very rapid further. So, much higher velocity of reducing gas can be allowed to improve the productivity of facility when hydrogen as reducing gas compares to CO gas. Metallization degree decrease s while utilization degree of gas increases gradually with the height of charge increasing. The reaction temperature can drop to 700~750℃ with hydrogen as reducing gas, which can avoid the sticking problems of fluidized bed.
2010, Vol. 45 
