A cleaner method for preparation of chromium oxide from chromite

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Qing Zhao, Chengjun Liu, Dapeng Yang, Peiyang Shi, Maofa Jiang, Baokuan Li, Henrik Saxén, Ron Zevenhoven
Förläggare: Elsevier
Publiceringsår: 2017
Tidskrift: Process Safety and Environmental Protection
Tidskriftsakronym: PSEP
Volym: 105
Artikelns första sida, sidnummer: 91
Artikelns sista sida, sidnummer: 100
eISSN: 1876-4800


Abstrakt

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.


Nyckelord

chromite, ore processing

Senast uppdaterad 2019-23-09 vid 02:58