| Oxidization mechanism in CaO-FeOx-SiO2 slag with high iron content |
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| 作者姓名： | 张林楠 张力 王明玉 隋智通 |
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| 作者单位： | School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China |
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| 摘 要： | Oxidization mechanism in CaO-FeOx-SiO2 slag with high iron content was investigated by blowing oxygen into molten slag so as to oxidize Fe（ Ⅱ）. The relationship between Fe（ Ⅱ ） content and oxidizing time at different temperatures was obtained by chemical analysis. Microstructure of slag was observed by metallographic microscope and SEM. Phases compositions were ascertained by EDXS and XRD. Grain size and crystallizing quantity of magnetite（Fe3O4 ） were determined by image analyzer. The oxidizing kinetic equations were deduced. Confirmed by graphical construction method, Fe（ Ⅱ ） oxidizing reaction in CaO-FeOx-SiO2 slag system is of first order, and the reaction apparent energy Eo is 296. 67 kJ/mol in the pure oxygen and 340. 30 kJ/mol in air. The enrichment and crystal growth mechanism of magnetite（Fe3O4 ） phases were investigated. In oxidizing process, content of fayalite declines, while that of magnetite（Fe3O4 ） increases, and iron resources enrich into magnetite（Fe3O4 ） phase. All these provide a theoretical base for compressive utilizing of those slags.
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| 关 键 词： | CaO-FeOx-SiO2 成溶渣 氧化装置 铜 冶炼工艺 |
| 文章编号： | 1003-6326（2005）04-0938-06 |
| 收稿时间： | 2004-11-08 |
| 修稿时间： | 2005-01-25 |
Oxidization mechanism in CaO-FeOx-SiO2 slag with high iron content |
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| ZHANG Lin-nan,ZHANG Li,WANG Ming-yu,SUI Zhi-tong.Oxidization mechanism in CaO-FeOx-SiO2 slag with high iron content[J].Transactions of Nonferrous Metals Society of China,2005,15(4):938-943. |
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| Authors: | ZHANG Lin-nan ZHANG Li WANG Ming-yu SUI Zhi-tong |
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| Abstract: | Oxidization mechanism in CaO-FeOx-SiO2 slag with high iron content was investigated by blowing oxygen into molten slag so as to oxidize Fe( Ⅱ ). The relationship between Fe( Ⅱ ) content and oxidizing time at different temperatures was obtained by chemical analysis. Microstructure of slag was observed by metallographic microscope and SEM. Phases compositions were ascertained by EDXS and XRD. Grain size and crystallizing quantity of magnetite(Fe3O4) were determined by image analyzer. The oxidizing kinetic equations were deduced. Confirmed by graphical construction method, Fe( Ⅱ ) oxidizing reaction in CaO-FeOx-SiO2 slag system is of first order, and the reaction apparent energy Ea is 296.67 kJ/mol in the pure oxygen and 340. 30 kJ/mol in air. The enrichment and crystal growth mechanism of magnetite(Fe3O4) phases were investigated. In oxidizing process, content of fayalite declines,while that of magnetite(Fe3O4 ) increases, and iron resources enrich into magnetite(Fe3O4 ) phase. All these provide a theoretical base for compressive utilizing of those slags. |
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| Keywords: | oxidizing magnetite kinetics phase transformation CaO-FeOx-SiO2 slag |
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