Pressure oxidative leaching of Indian chromite ore in concentrated NaOH solution
文献类型：期刊论文
| 作者 | Zhang, Hai1,2,3; Xu, Hong-bin1,2; Zhang, Xiaofei1,2; Zhang, Yang1,2; Zhang, Yi1,2 |
| 刊名 | HYDROMETALLURGY
 |
| 出版日期 | 2014-02-01 |
| 卷号 | 142期号:1页码:47-55 |
| 关键词 | Chromite ore Pressure leaching Sodium hydroxide Kinetics Oxygen |
| ISSN号 | 0304-386X |
| 其他题名 | Hydrometallurgy |
| 中文摘要 | A novel process for leaching chromite ore has been proposed. Compared to the traditional alkaline roasting process, the new hydrometallurgical process lowers effectively the reaction temperature and enhances the leaching efficiency through pressure oxidative leaching with pure oxygen (O-2) in concentrated sodium hydroxide (NaOH) aqueous solution. The chromium (Cr) leaching efficiency reaches 99% with ore particle size of 40 to 50 pm, Na0H-to-ore mass ratio of 4:1, NaOH concentration of 60 wt.%, O-2 partial pressure of 3.2 MPa, and reaction temperature of 250 degrees C. By investigating the dependence of the Cr leaching efficiency on NaOH concentration, O-2 partial pressure, and reaction temperature, the macrokinetics can be described by the shrinking core model under control diffusion through the solid product layer with apparent activation energy of 54.6 kj/mol. It was also found that during the leaching process, the alkaline insoluble iron (Fe) and magnesium (Mg) in the chromite ore remain in the residue in the form of magnesium hydroxide (Mg(OH)(2)) and magnesium ferrite (MgFe2O4) while the divalent Fe is oxidized to trivalent Fe. Furthermore, in the initial stage of the leaching process, silicon (Si) is leached faster than aluminum (Al) and their concentrations in the aqueous solution increase rapidly with reaction time. However, as the leaching proceeds further, the Si concentration in the aqueous solution drops a little and then stays constant. (C) 2013 Elsevier B.V. All rights reserved. |
| 英文摘要 | A novel process for leaching chromite ore has been proposed. Compared to the traditional alkaline roasting process, the new hydrometallurgical process lowers effectively the reaction temperature and enhances the leaching efficiency through pressure oxidative leaching with pure oxygen (O-2) in concentrated sodium hydroxide (NaOH) aqueous solution. The chromium (Cr) leaching efficiency reaches 99% with ore particle size of 40 to 50 pm, Na0H-to-ore mass ratio of 4:1, NaOH concentration of 60 wt.%, O-2 partial pressure of 3.2 MPa, and reaction temperature of 250 degrees C. By investigating the dependence of the Cr leaching efficiency on NaOH concentration, O-2 partial pressure, and reaction temperature, the macrokinetics can be described by the shrinking core model under control diffusion through the solid product layer with apparent activation energy of 54.6 kj/mol. It was also found that during the leaching process, the alkaline insoluble iron (Fe) and magnesium (Mg) in the chromite ore remain in the residue in the form of magnesium hydroxide (Mg(OH)(2)) and magnesium ferrite (MgFe2O4) while the divalent Fe is oxidized to trivalent Fe. Furthermore, in the initial stage of the leaching process, silicon (Si) is leached faster than aluminum (Al) and their concentrations in the aqueous solution increase rapidly with reaction time. However, as the leaching proceeds further, the Si concentration in the aqueous solution drops a little and then stays constant. (C) 2013 Elsevier B.V. All rights reserved. |
| WOS标题词 | Science & Technology ; Technology |
| 类目[WOS] | Metallurgy & Metallurgical Engineering |
| 研究领域[WOS] | Metallurgy & Metallurgical Engineering |
| 关键词[WOS] | CHROMATE |
| 收录类别 | SCI |
| 原文出处 | |
| 语种 | 英语 |
| WOS记录号 | WOS:000331688200005 |
| 公开日期 | 2014-05-06 |
| 版本 | 出版稿 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/8177]  |
| 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, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Hai,Xu, Hong-bin,Zhang, Xiaofei,et al. Pressure oxidative leaching of Indian chromite ore in concentrated NaOH solution[J]. HYDROMETALLURGY,2014,142(1):47-55. |
| APA | Zhang, Hai,Xu, Hong-bin,Zhang, Xiaofei,Zhang, Yang,&Zhang, Yi.(2014).Pressure oxidative leaching of Indian chromite ore in concentrated NaOH solution.HYDROMETALLURGY,142(1),47-55. |
| MLA | Zhang, Hai,et al."Pressure oxidative leaching of Indian chromite ore in concentrated NaOH solution".HYDROMETALLURGY 142.1(2014):47-55. |
入库方式： OAI收割
来源：过程工程研究所
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