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A clean and efficient leaching process for chromite ore
Alternative TitleMiner. Eng.
Chen, Gang1,2; Wang, Xiaohui1; Du, Hao1; Zhang, Ying1; Wang, Jiajun3; Zheng, Shili1; Zhang, Yi1
2014-06-01
Source PublicationMINERALS ENGINEERING
ISSN0892-6875
Volume60Issue:1Pages:60-68
AbstractIn 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.; 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.
KeywordChromite Ore Copr Pollution-free Residue Pressure Leaching Kinetics
SubtypeArticle
WOS HeadingsScience & Technology ; Technology ; Physical Sciences
DOI10.1016/j.mineng.2014.01.025
URL查看原文
Indexed BySCI
Language英语
WOS KeywordPOTASSIUM HYDROXIDE SOLUTIONS ; HEXAVALENT CHROMIUM ; CHROMATE PRODUCTION ; RESIDUE ; REMEDIATION ; KINETICS ; SYSTEM ; OXYGEN
WOS Research AreaEngineering ; Mineralogy ; Mining & Mineral Processing
WOS SubjectEngineering, Chemical ; Mineralogy ; Mining & Mineral Processing
WOS IDWOS:000335290300009
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/10883
Collection研究所(批量导入)
Affiliation1.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
Recommended Citation
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.
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