Abstract
After the desulphurizing reactions between the liquid pig iron of Fe-C-S system and the solid lime and calcium carbide were discussed in accordance with the phase rule, the relation between the equilibrium values of the carbon and sulphur contents of the iron and temperature was calculated with thermodynamical data. The limit of desulphurization with the solid lime was very low and it decreased with the increase of the carbon content of the iron when temperature and the partial pressure of carbon monoxide in gaseous phase were constant. The limit of desulphurization with solid calcium carbide was also considerably low and it decreased as t content of the iron decreased at a given temperature.
According to the equilibrium data of the reaction CaO(s)+3C=CaC2(s)+CO(g) desulphurization of the pig iron with solid lime was generally larger than with carbide and its minimum value was equal to the limit of desulphurization with carbide.
