A clean and efficient leaching process for chromite ore
文献类型：期刊论文
| 作者 | Chen, Gang1,2; Wang, Xiaohui1; Du, Hao1; Zhang, Ying1; Wang, Jiajun3; Zheng, Shili1; Zhang, Yi1 |
| 刊名 | MINERALS ENGINEERING
 |
| 出版日期 | 2014-06-01 |
| 卷号 | 60期号:1页码:60-68 |
| 关键词 | Chromite ore COPR Pollution-free residue Pressure leaching Kinetics |
| ISSN号 | 0892-6875 |
| 其他题名 | Miner. Eng. |
| 中文摘要 | In order to improve the chromate salts cleaner production technology, a pressure leaching process for chromite ore in 50 wt% KOH solution was studied for the first time and the results were presented in this manuscript. It was found out that the chromium extraction rate increased significantly with the increase of temperature and oxygen partial pressure, and the kinetics study confirmed that the leaching process was controlled by the surface chemical reaction. The iron in chromite ore was oxidized to form crystalline Fe2O3 particles with compact surface which was different from the conventional amorphous residue. The effect of the KOH solution concentration on the leach residue was investigated, and the characteristics of the leach residues were determined and compared. When the concentration of KOH solution was 60 wt% or less, the leach residues mainly consisted of crystalline particles, and the residual chromium (VI) contents met the disposal standard for chromium-containing waste. The reaction conditions of the pressure leaching process were investigated, and the preferred reaction parameters in 50 wt% KOH solution were determined. In summary, this leaching process exhibited significant advantages over the traditional roasting and other hydrometallurgical methods with respect to both environmental protection and process economy, providing an attractive alternative to upgrade the current chromate salts production processes. (C) 2014 Published by Elsevier Ltd. |
| 英文摘要 | In order to improve the chromate salts cleaner production technology, a pressure leaching process for chromite ore in 50 wt% KOH solution was studied for the first time and the results were presented in this manuscript. It was found out that the chromium extraction rate increased significantly with the increase of temperature and oxygen partial pressure, and the kinetics study confirmed that the leaching process was controlled by the surface chemical reaction. The iron in chromite ore was oxidized to form crystalline Fe2O3 particles with compact surface which was different from the conventional amorphous residue. The effect of the KOH solution concentration on the leach residue was investigated, and the characteristics of the leach residues were determined and compared. When the concentration of KOH solution was 60 wt% or less, the leach residues mainly consisted of crystalline particles, and the residual chromium (VI) contents met the disposal standard for chromium-containing waste. The reaction conditions of the pressure leaching process were investigated, and the preferred reaction parameters in 50 wt% KOH solution were determined. In summary, this leaching process exhibited significant advantages over the traditional roasting and other hydrometallurgical methods with respect to both environmental protection and process economy, providing an attractive alternative to upgrade the current chromate salts production processes. (C) 2014 Published by Elsevier Ltd. |
| WOS标题词 | Science & Technology ; Technology ; Physical Sciences |
| 类目[WOS] | Engineering, Chemical ; Mineralogy ; Mining & Mineral Processing |
| 研究领域[WOS] | Engineering ; Mineralogy ; Mining & Mineral Processing |
| 关键词[WOS] | POTASSIUM HYDROXIDE SOLUTIONS ; HEXAVALENT CHROMIUM ; CHROMATE PRODUCTION ; RESIDUE ; REMEDIATION ; KINETICS ; SYSTEM ; OXYGEN |
| 收录类别 | SCI |
| 原文出处 | |
| 语种 | 英语 |
| WOS记录号 | WOS:000335290300009 |
| 公开日期 | 2014-08-28 |
| 版本 | 出版稿 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/10883]  |
| 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, Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.China Univ Min & Technol Beijing, Sch Chem & Environm Engn, Beijing 100083, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, Gang,Wang, Xiaohui,Du, Hao,et al. A clean and efficient leaching process for chromite ore[J]. MINERALS ENGINEERING,2014,60(1):60-68. |
| APA | Chen, Gang.,Wang, Xiaohui.,Du, Hao.,Zhang, Ying.,Wang, Jiajun.,...&Zhang, Yi.(2014).A clean and efficient leaching process for chromite ore.MINERALS ENGINEERING,60(1),60-68. |
| MLA | Chen, Gang,et al."A clean and efficient leaching process for chromite ore".MINERALS ENGINEERING 60.1(2014):60-68. |
入库方式： OAI收割
来源：过程工程研究所
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