On the Desulfurization Rate of Hot Metal by Magnesium Injection

Abstract

Cold and hot model experiments have been made to investigate the kinetics of desulfurization of hot metal by magnesium granules injected with carrier gas. The followings are the major remarks obtained:
(1) The desulfurization rate is remarkably enhanced when the bath surface is covered with inert gas.
(2) It is theoretically predicted that a magnesium particle of 2 mm in diam. detatches from the gas jet of 200 m/sec in linear velocity and penetrates into molten iron.
(3) By assuming the mass transfer of S as a rate controlling step, a theoretical prediction is made for the rates of desulfurization. The immersion depth of a lance significantly influences the rate of desulfurization ; it is preferable to release magnesium bubbles from the bottom of the bath.
(4) The validity of the present model is shown by the plant scale experiments of 60 t in heat size.