Abstract: On the basis of onedimension nonsteady heat transfer theory， a numerical model of the dynamic behavior of oxide pellet in molten slag was established and solved with finite difference method. The melting time under different conditions was calculated with the model， and the results showed good agreement with the experimental data. The melting time of pellet at 1450， 1500， 1550℃ in molten slag bath is 56， 36， 25s， and the maximum thickness of slag shell is 0211， 0149， 0109cm， respectively. The melting rate increases with the increase of slag bath temperature and pellet preheating temperature. The melting time is almost the same when the slag basicity is in the range of 08~12， but the melting time increases obviously when the basicity is below 08. The maximum thickness of slag shell increases with the increase of pellet metallization ratio and diameter， but the former has less effect on melting time than the latter.

Key words: oxide pellet, molten slag, slag shell, melting rate, numerical simulation