Influence of phase and microstructure on the rate of hydrochloric acid leaching in pretreated Panzhihua ilmenite
文献类型：期刊论文
| 作者 | Zhu, Qingshan1; Zhang, Jianbo1,2; Li, Hongzhong1 |
| 刊名 | PARTICUOLOGY
 |
| 出版日期 | 2014-06-01 |
| 卷号 | 14期号:3页码:83-90 |
| 关键词 | Ilmenite Oxidation Reduction Hydrochloric acid leaching |
| ISSN号 | 1674-2001 |
| 其他题名 | Particuology |
| 中文摘要 | The present study investigated the influence of high temperature oxidation and reduction pretreatments on the leaching rate of Panzhihua ilmenite. The as-pretreated ilmenite was leached with 20% HCl at 105 degrees C. The leaching process was controlled by the phases and microstructures that evolved during the pretreatment processes. The leaching kinetics of pure hematite, ilmenite and pseudobrookite were characterized to clarify the phase effect on the iron-leaching rate; the rate of iron leaching occurs in the following order in the HCl solution: hematite (ferric iron) > ilmenite (ferrous iron) >> pseudobrookite (ferric iron). Therefore, the often-cited notion that ferrous iron dissolves faster in HCl solutions than ferric iron when explaining the pretreatment effects is inaccurate. Moreover, the oxidation pretreatment (at 600-1000 degrees C for 4h) cannot destroy the dense structure of the Panzhihua ilmenite. Therefore, the influence exerted by the oxidation on the leaching process is primarily determined by the phase change; oxidation at 600 and 700 degrees C slightly increased the rate of iron leaching because the ilmenite was transformed into hematite, while the oxidation at 900-1000 degrees C significantly reduced the rate of iron leaching because a pseudobrookite phase formed. The reduction effect was subsequently investigated; the as-oxidized ilmenite was reduced under H-2 at 750 degrees C for 30 min. The reduction significantly accelerated the rate of subsequent iron leaching such that nearly all of the iron had dissolved after leaching for 2 h in 20% HCl at 105 degrees C. This enhanced iron-leaching rate is mainly attributed to the cracks and holes that formed during the reduction process. (C) 2013 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved. |
| 英文摘要 | The present study investigated the influence of high temperature oxidation and reduction pretreatments on the leaching rate of Panzhihua ilmenite. The as-pretreated ilmenite was leached with 20% HCl at 105 degrees C. The leaching process was controlled by the phases and microstructures that evolved during the pretreatment processes. The leaching kinetics of pure hematite, ilmenite and pseudobrookite were characterized to clarify the phase effect on the iron-leaching rate; the rate of iron leaching occurs in the following order in the HCl solution: hematite (ferric iron) > ilmenite (ferrous iron) >> pseudobrookite (ferric iron). Therefore, the often-cited notion that ferrous iron dissolves faster in HCl solutions than ferric iron when explaining the pretreatment effects is inaccurate. Moreover, the oxidation pretreatment (at 600-1000 degrees C for 4h) cannot destroy the dense structure of the Panzhihua ilmenite. Therefore, the influence exerted by the oxidation on the leaching process is primarily determined by the phase change; oxidation at 600 and 700 degrees C slightly increased the rate of iron leaching because the ilmenite was transformed into hematite, while the oxidation at 900-1000 degrees C significantly reduced the rate of iron leaching because a pseudobrookite phase formed. The reduction effect was subsequently investigated; the as-oxidized ilmenite was reduced under H-2 at 750 degrees C for 30 min. The reduction significantly accelerated the rate of subsequent iron leaching such that nearly all of the iron had dissolved after leaching for 2 h in 20% HCl at 105 degrees C. This enhanced iron-leaching rate is mainly attributed to the cracks and holes that formed during the reduction process. (C) 2013 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved. |
| WOS标题词 | Science & Technology ; Technology |
| 类目[WOS] | Engineering, Chemical ; Materials Science, Multidisciplinary |
| 研究领域[WOS] | Engineering ; Materials Science |
| 关键词[WOS] | ROSETTA ILMENITE ; SYNTHETIC RUTILE ; REDUCTION ; ORE ; KINETICS |
| 收录类别 | SCI |
| 原文出处 | |
| 语种 | 英语 |
| WOS记录号 | WOS:000338609600013 |
| 公开日期 | 2014-08-28 |
| 版本 | 出版稿 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/11061]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 作者单位 | 1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhu, Qingshan,Zhang, Jianbo,Li, Hongzhong. Influence of phase and microstructure on the rate of hydrochloric acid leaching in pretreated Panzhihua ilmenite[J]. PARTICUOLOGY,2014,14(3):83-90. |
| APA | Zhu, Qingshan,Zhang, Jianbo,&Li, Hongzhong.(2014).Influence of phase and microstructure on the rate of hydrochloric acid leaching in pretreated Panzhihua ilmenite.PARTICUOLOGY,14(3),83-90. |
| MLA | Zhu, Qingshan,et al."Influence of phase and microstructure on the rate of hydrochloric acid leaching in pretreated Panzhihua ilmenite".PARTICUOLOGY 14.3(2014):83-90. |
入库方式： OAI收割
来源：过程工程研究所
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