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■■■■■■■■■■■■■■■■■■■ 川崎製鉄技報 KAWASAKI STEEL GIHO Vol.14 (1982) No.1 ■■■■■■■■■■■■■■■■■■■ |
| 溶銑用の生石灰系吹込みの脱硫剤の開発 Lime-based Powder Reagent for Hot Metal Desulfurization Torpedo Car 拝田 治(Osamu Haida) 江見 俊彦(Toshihiko Emi) 数土 文夫(Fumio Sudo) 山田 純夫(Sumio Yamada) 馬田 一(Hajime Bada) |
| 要旨 : 微紛で流動性の良い，溶銑用の生石灰系吹込み脱硫剤を開発した。生石灰粉の粒径と，脱硫剤中のC, CaF2, CaCO3含有量を最適化して，文献値に比べ非常に高い生石灰反応効率（ηcao）を得た。カーバイド脱硫に用いた混銑車に高炉で受銑すると復硫するが，生石灰脱硫ではこの復硫が無い。脱硫剤中のCaCO3含有量がηcaoに与える影響と、上記復硫の無い理由を、混銑車内の溶銑の均一混合時間と脱硫前後のスラグ組成を用いて，理論的に考察した。ηcaoが高いことと，復硫が無いことにより，生石灰脱硫剤原単位はカーバイド使用の場合に比べ半減し，またレンガの選択と混銑車回転率の向上により，耐火物コストも80％に低減した。千葉製鉄所第3製綱工場では，1979年8月に，生石灰系脱硫剤への移行を完了した。 |
| Synopsis : Lime-based mixing reagent with fine grain size and improved fluidity has been developed for hot metal desulfurization using the torpedo car (top) injection method. With the optimization of both the powder size and the C, CaF2, and CaCO3 contents in the reagent, lime reaction efficiency is improved far higher than the level reported in counterpart documents. This desulfurization method does not lead to resulfurzation which usually occurs during the hot metal teeming into torpedo cars into which calcium carbide has been injected for desulfurization purposes. The effect of CaCO3 content in the reagent on ηcao and the absence of resulfurization is theoretically explained on the basis of uniform mixing time of hot metal in torpedo cars and the analysis of torpedo slags taken before and after the desulfurization. The high value of ηcao and the absence of resulfurization have contributed to lowering the unit consumption cost of the lime-based reagent to roughy one-half of that of carbide. Also, the choice of suitable lining material for torpedo car utilization have reduced the lining cost for lime desulfurization to about 80% of that for the carbide desulfurization. The lime-based reagent replaced calcium carbide in August 1979 at No.3 Steelmaking Shop at Chiba Works. |
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