A cleaner method for preparation of chromium oxide from chromite

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Qing Zhao, Chengjun Liu, Dapeng Yang, Peiyang Shi, Maofa Jiang, Baokuan Li, Henrik Saxén, Ron Zevenhoven
Publisher: Elsevier
Publication year: 2017
Journal: Process Safety and Environmental Protection
Journal acronym: PSEP
Volume number: 105
Start page: 91
End page: 100
eISSN: 1876-4800


Abstract

A new leaching process for preparing chromium oxide from chromite was studied in this paper, using Cr(VI) extracted from the remediation treatment of chromite ore processing residue (COPR) as an oxidant. Thus, the “detoxification” of deposited COPR could be achieved and no new Cr(VI)-bearing substances would be generated in preparation process of chromium oxide. Thermodynamic analysis was applied and several tests were conducted. It was found that a chromite with higher Fe(II) content showed lower stability in an oxidizing solution. A general decomposition mechanism of chromite is proposed and suggests that the oxidation of ions in spinel plays a significant role in decomposing chromite. Furthermore, the extraction process of chromium from leachate was investigated. Results demonstrated that iron, magnesium and aluminum could be effectively removed via oxalic acid treatment and subsequent pH adjustment, with chromium oxide as the final product.


Keywords

chromite, ore processing

Last updated on 2019-18-06 at 04:54