THE EVALUATION OF GAS-LIQUID REACTION-RAT E AT BATH SURFACE BY THE GAS-ADSORPTION AND DESORPTION TESTS

The separated estimation of the reaction rate at bath surface (surface reaction) and at Ar bubble interface flotating in the bath (bubble re action) was achieved by the measurements of gas adsorption and desorpt ion rate. The influence of various factors on the surface reaction rat e of gas and liquid reaction under the gas stirring condition was inve stigated for water and molten steel systems. The following points were clarified: 1)The ratio of surface reaction rate to the bubble reactio n rate for N-2-molten steel system is much larger than that. for O-2-w ater system. 2)Most of the surface reaction occurs at the flotating ar ea of Ar gas bubbles at the bath surface (activated surface area). 3)T he surface reaction rate increases in propotion to one-second power of Ar gas flow rate and in inverse propotion to two-third power of the p ressure. In addition, it is strongly influenced by the gas injection d epth. 4)The surface reaction rate well corresponds to the newly introd uced parameter for the N-2-molten steel and O-2-water system, consider ing the activated surface area, gas flow rate, pressure and gas inject ion depth.