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Leaching of Valuable Elements from the Waste Chromite Ore Processing Residue: A Kinetic Analysis

[Image: see text] The efficacious treatment and resource utilization of the chromite ore processing residue (COPR) is important for chromate salt production. In this study, the leaching of valuable elements from the waste COPR was investigated. X-ray diffraction (XRD) analysis showed that the COPR m...

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Autores principales: Zhang, Xingran, Li, Gang, Wu, Jun, Xiong, Neng, Quan, Xuejun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2020
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7424728/
https://www.ncbi.nlm.nih.gov/pubmed/32803058
http://dx.doi.org/10.1021/acsomega.0c02194
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author Zhang, Xingran
Li, Gang
Wu, Jun
Xiong, Neng
Quan, Xuejun
author_facet Zhang, Xingran
Li, Gang
Wu, Jun
Xiong, Neng
Quan, Xuejun
author_sort Zhang, Xingran
collection PubMed
description [Image: see text] The efficacious treatment and resource utilization of the chromite ore processing residue (COPR) is important for chromate salt production. In this study, the leaching of valuable elements from the waste COPR was investigated. X-ray diffraction (XRD) analysis showed that the COPR mainly contained periclase (MgCr(2)O(4)), magnesiochromite ((Fe, Mg) (Cr, Fe)(2)O(4)), Fe (Cr, Al)(2)O(4), and MgFeAlO(4). The optimum parameters for COPR leaching were as follows: mechanical ball-milling time of 120 min, sulfuric acid concentration (w/w % H(2)SO(4)) of 60%, reaction temperature (T) of 403 K, liquid–solid ratio (L/S) of 8 mL/g, and reaction time (t) of 6 h. Under these conditions, the valuable components such as Fe, Al, and Cr were extracted with an ideal leaching efficiency of 94.8, 75.1, and 76%, respectively. The results of the leaching kinetics analysis indicated that the leaching of Fe and Cr from the COPR was controlled by a surface chemical reaction, and the leaching of Al was controlled by diffusion through a product layer. The apparent activation energy of the leaching of Fe, Cr, and Al was calculated to be 23.03, 44.15, and 17.54 kJ/mol, respectively. It is believed that this approach has potential applications for the chromate salt industry because of its advantage of ideal leaching efficiency.
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spelling pubmed-74247282020-08-14 Leaching of Valuable Elements from the Waste Chromite Ore Processing Residue: A Kinetic Analysis Zhang, Xingran Li, Gang Wu, Jun Xiong, Neng Quan, Xuejun ACS Omega [Image: see text] The efficacious treatment and resource utilization of the chromite ore processing residue (COPR) is important for chromate salt production. In this study, the leaching of valuable elements from the waste COPR was investigated. X-ray diffraction (XRD) analysis showed that the COPR mainly contained periclase (MgCr(2)O(4)), magnesiochromite ((Fe, Mg) (Cr, Fe)(2)O(4)), Fe (Cr, Al)(2)O(4), and MgFeAlO(4). The optimum parameters for COPR leaching were as follows: mechanical ball-milling time of 120 min, sulfuric acid concentration (w/w % H(2)SO(4)) of 60%, reaction temperature (T) of 403 K, liquid–solid ratio (L/S) of 8 mL/g, and reaction time (t) of 6 h. Under these conditions, the valuable components such as Fe, Al, and Cr were extracted with an ideal leaching efficiency of 94.8, 75.1, and 76%, respectively. The results of the leaching kinetics analysis indicated that the leaching of Fe and Cr from the COPR was controlled by a surface chemical reaction, and the leaching of Al was controlled by diffusion through a product layer. The apparent activation energy of the leaching of Fe, Cr, and Al was calculated to be 23.03, 44.15, and 17.54 kJ/mol, respectively. It is believed that this approach has potential applications for the chromate salt industry because of its advantage of ideal leaching efficiency. American Chemical Society 2020-07-27 /pmc/articles/PMC7424728/ /pubmed/32803058 http://dx.doi.org/10.1021/acsomega.0c02194 Text en Copyright © 2020 American Chemical Society This is an open access article published under a Creative Commons Non-Commercial No Derivative Works (CC-BY-NC-ND) Attribution License (http://pubs.acs.org/page/policy/authorchoice_ccbyncnd_termsofuse.html) , which permits copying and redistribution of the article, and creation of adaptations, all for non-commercial purposes.
spellingShingle Zhang, Xingran
Li, Gang
Wu, Jun
Xiong, Neng
Quan, Xuejun
Leaching of Valuable Elements from the Waste Chromite Ore Processing Residue: A Kinetic Analysis
title Leaching of Valuable Elements from the Waste Chromite Ore Processing Residue: A Kinetic Analysis
title_full Leaching of Valuable Elements from the Waste Chromite Ore Processing Residue: A Kinetic Analysis
title_fullStr Leaching of Valuable Elements from the Waste Chromite Ore Processing Residue: A Kinetic Analysis
title_full_unstemmed Leaching of Valuable Elements from the Waste Chromite Ore Processing Residue: A Kinetic Analysis
title_short Leaching of Valuable Elements from the Waste Chromite Ore Processing Residue: A Kinetic Analysis
title_sort leaching of valuable elements from the waste chromite ore processing residue: a kinetic analysis
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7424728/
https://www.ncbi.nlm.nih.gov/pubmed/32803058
http://dx.doi.org/10.1021/acsomega.0c02194
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