A cleaner method for preparation of chromium oxide from chromite

Qing Zhao, Chengjun Liu, Dapeng Yang, Peiyang Shi, Maofa Jiang, Li Baokuan, Henrik Saxén, Ron Zevenhoven

Research output: Contribution to journalArticleScientificpeer-review

20 Citations (Scopus)

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.
Original languageUndefined/Unknown
Pages (from-to)91–100
JournalProcess Safety and Environmental Protection
Volume105
DOIs
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • chromite
  • ore processing

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