中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
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://WOS:000335290300009
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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