Kinetics studies on the dissolution of nitrogen in the CaOAl2O3-SiO2 and CaO-Al2O3-TiOx melts

The rate of nitrogen dissolution in CaO-Al2O3-SiO2 and CaO-Al2O3-TiOx melts was measured by N-14-N-15 isotope exchange reaction. The rate constant for the CaO-Al2O3-SiO2 melts at the ratio of mass pet CaO/mass pct Al2O3 = 1 i ncreases as SiO2 content increases, whereas the rate constant for the same melts at the ratio of mass pet CaO/mass pet SiO2 = 1 increases as Al2O3 con tent increases. The rate constant for the CaO-Al2O3-TiO(x)melts at the rati o of mass pet CaO/mass pet Al2O3 = 1 decreases as the TiOx content increase s. The activation energies of nitrogen dissolution in CaO-Al2O3-SiO2 melts are about 1.5 to 3 times larger than that of molten pure iron. Moreover, th e rate constant of nitrogen dissolution is independent of the ratio of Ti3/Ti4+.