著者

嘉村 平八

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.25, no.7, pp.535-543, 1939-07-25

---

In this paper, the recent development of acid smelting of the blast furnace is discussed. The working results with acid slag at the Corby Works in England and the Gutehof-fnungshutte in Germany are briefly described. In the Corby works, it has been previously very difficult to smelt Northamptonshire ore for the manufacture of basic pig iron for steel making purposes, on account of the high proportion of alumina to silica. The difficulties encountered with high alumina slag has been successfully overcome with the basicity ratio of about 0.93 in the slag, which is the ratio of lime to silica for obtaining a minimum melting point and a minimum viscosity. In the Gutehoffnungshutte, the idea is to reduce the amount of slag produced and the quantity of coke consumed in the smelting of low grade German ore for the production of basic bessemer pig iron with acid slag which has the basicity ratio 0.8. It is an unsuitable and inefficient method for the elimination of sulphur, and no attention is paid to the sulphur content of the pig iron. The sulphur is removed by subsequent treatment with soda.