| Project/Area Number |
11691142
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Metal making engineering
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| Research Institution | Tohoku university |
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Principal Investigator |
YAGI Jun-ichiro Tohoku university, Institute for Advanced Materials Processing, Professor, 素材工学研究所, 教授 (20006050)
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| Co-Investigator(Kenkyū-buntansha) |
AKIYAMA Tomohiro Osaka Prefecture University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (50175808)
NOGAMI Hiroshi Tohoku University, Institute for Advanced Materials Processing, Assistant, 素材工学研究所, 助手 (50241584)
TAKAHASHI Reijiro Tohoku University, Institute for Advanced Materials Processing, Associate Professor, 素材工学研究所, 助教授 (30006051)
張 興和 東北大学, 素材工学研究所, 助手 (40292271)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥12,200,000 (Direct Cost: ¥12,200,000)
Fiscal Year 2000: ¥5,800,000 (Direct Cost: ¥5,800,000)
Fiscal Year 1999: ¥6,400,000 (Direct Cost: ¥6,400,000)
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| Keywords | Steelmaking Process / Cold Pellet / Reduction Rate / Swelling / Zinc Separation / Electric Arc Furnace Dust / Sub micron Particle / Coke Filter |
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| Research Abstract |
Brazilian cooperative researchers studied physico-chemical properties of dusts generated in both BF ironmaking and EAF processes. For the former which does not contain zinc, cold bonded pellets having carbonaceous materials, produced from the dust are reported to have enough strength and reducibility as well as no swelling and broken out therefore being proved as sound raw materials for both gas reduction and smelting reduction processes.
For the EAF dust which contains considerable quantity of the complex spinel of (Zn, Fe, Mn)Fe_2O_4, strength and reducibility have been studied. As the results, abnormal swelling was found to occurs when it was heated to 1060C, 95%Zn was removed when it was heated over 1200C, and about 70% Zn was vaporized as ZnO and concentrated in dust when it was processed in smelting reduction. The crude zinc obtained can be used as raw materials for zinc smelting.
Cooperative researchers in Japanese side are developing a coke filter process for the separation of zi
… More
nc from iron. In this method, zinc contained in the EAF dust as complex spinel structure can be evaporated in coke moving bed heated over 1000 C and recovered as liquid zinc in a condenser. On the other hand iron is reduced in the coke bed in solid state and discharged together with coke and recovered in conventional or smelting reduction ironmaking processes.
Behavior of over micron particles has been studied in our lab. resulting in high efficiency separation by using a coke packed bed. However, EAF dust contains high quantity of sub micron particles. In this study, we investigated filtration of such sub micron particles by using a cold model of the coke filter process. However, complete result has not yet obtained.
In addition, a fundamental study has been made on the recovery of thermal energy from molten slag together with uniformly sized fine slag particles applying chemical reaction. Atomization of wax was studied by using a quasi-hot model of a rotating cup-atomizer and atomization of high temperature molten slag has also tested. Fine particles of considerably uniform size (about 0.7mm) were obtained for wax atomization and fine particles were also obtained for slag pulverization, which provided a positive basis for developing a practical process. Less
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