CaCO_3 系脱硫剤による極低硫溶銑の製造と脱硫反応機構

概要

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Hot metal desulfurization by injecting CaCO_3 base flux into a torpedo car has been studied. The desulfurization efficiency for CaCO_3 base flux has been found to be higher than that for CaO base flux. This is attributed to the increase of the reaction interface area due to the thermal decomposition of the injected CaCO_3 particles. The rate determining step of the desulfurization reaction in this process is liquid-phase mass transfer when the sulfur content is less than 0.013%, and mass transfer in solid particles when the sulfur content is more than 0.013%. It has also been revealed that the endothermic effect of the thermal decomposition of CaCO_3 is compensated by the exothermic effect of the desiliconization reaction by CO_2 gas, a product of CaCO_3 decomposition, and therefore does not result in larger temperature decrease of the hot metal compared with CaO base flux.
社団法人日本鉄鋼協会の論文
1986-01-01