著者

久保 裕也 丸岡 伸洋 佐藤 嘉将

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.105, no.9, pp.871-876, 2019 (Released:2019-08-31)

参考文献数

12

被引用文献数

3

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Fundamental experiments were conducted with the aim of crude separation of the phosphorus contained in high-P iron ore prior to the ironmaking process. By reducing high-P iron ore with lime and graphite at an appropriate blending ratio and temperature, a reduction product was obtained consisting of a P-concentrated phase, metallic Fe with low P, and an Fe oxide-containing phase. The reduction product was pulverized by electrical pulse disintegration, and a magnetic separation experiment was performed for each particle group. As a result, 57.5% of the P contained in the reduction product was removed by removing particles of 250 μm or less. Samples simulating the constituent phases of the reduction products were synthesized and subjected to magnetization measurement. It was assumed that the Fe oxide-containing phase was paramagnetic and the P-concentrated phase was diamagnetic. We calculated the magnetic and drag forces acting on the paramagnetic particles in wet magnetic separation. When the magnetic field gradient was low, the magnetic forces acting on the fine particles were low, and attraction was difficult due to the drag force of water.

著者

小川 雄司 丸岡 伸洋

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.100, no.4, pp.434-444, 2014 (Released:2014-03-31)

参考文献数

92

被引用文献数

8 15

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Progress of hot metal treatment technology in Japan and scientific researches which supported the technology are outlined.To meet the increasingly severe customer requirements for steel properties, integrated steelmakers developed technologies for purifying molten steel, centering on the divided refining process, consisting of hot metal treatment, BOF decarburization and secondary refining. The hot metal treatment processes were put into practice at almost all steelworks in the 1980 s.Since the 1990 s, all companies have improved and restructured the hot metal treatment facilities, aiming at not only improvement of refining efficiency so as to achieve a higher degree of purity steel with higher productivity at lower cost, but also reduction in slag volume with the environmental problems taken into consideration.The directions in which hot metal treatment technology is to be pursued in the future are also commented briefly.