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Diffusion of Sulfur in Molten CaO-SiO_2-Al_2O_3 Slag

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As the first step in the study on the kinetics of desulfurization of iron by slag, the rate of diffusion of sulfur in molten CaO-SiO_2-Al_2O_3 slag was determined by the use of radioactive sulfur S^<35>. Iron sulfide powder made from barium sulfide containing S^<35> was mixed with powdered CaO-SiO_2-Al_2O_3 slag, and after melting, this radioactive sample was poured into a graphite tube, which was coupled with a graphite crucible containing a non-radioactive sample of nearly the same composition as the radioactive sample. Then, the couple was heated in a high frequency induction furnace in a nitrogen atmosphere for a definite time. After cooling in the furnace, thin slices were successively cut off from the top of the slag column, and the radioactive intensity of the polished surfaces of the remainder was measured by a Geiger-Muller counter. From these measurements, the diffusion coefficient D of sulfur in a molten basic slag was determined as follows : D=1.4e-49, 000/RT. The diffusion coefficient in an acid slag at 1, 440℃ was nearly the same as in the basic slag, but its values at higher temperatures could not be measured, owing to the evolution of gas by the reaction, SiO_2+2C→Si+2CO.

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