| 摘要 |
<P>PROBLEM TO BE SOLVED: To effectively recycle desulfurization slag as a CaO source in a pig iron making step or a steelmaking step, without any effect of sulfur contained therein, by efficiently removing sulfur contained in the desulfurization slag produced by a desulfurization treatment of molten iron. <P>SOLUTION: The method for removing sulfur from the desulfurization slag comprises: a first step of exposing the sulfur-containing desulfurization slag produced by the desulfurization treatment of the molten iron to an atmosphere in which the temperature is within the range of 1,100-1,400°C and the CO/CO<SB POS="POST">2</SB>ratio is adjusted according to the form of a sulfur compound in the desulfurization slag, thereby transferring the sulfur as SO<SB POS="POST">x</SB>from the desulfurization slag into a gas phase; a second step of carrying out a desulfurization treatment of exhaust gas containing SO<SB POS="POST">x</SB>transferred into the gas phase in the first step; and a third step of recycling the desulfurization slag in which the sulfur content is reduced by the first step as the CaO source in the pig iron making step or a steelmaking step. <P>COPYRIGHT: (C)2013,JPO&INPIT |
