Red-mud treatment using oxalic acid by UV irradiation assistance

Autor:	Zhi-xia Shi, Yinjian Niu, Zhang-long Yu, Yongmei Chen, Yong-xia Wang, Pingyu Wan
Rok vydání:	2012
Předmět:	Precipitation (chemistry) Chemistry Inorganic chemistry Oxalic acid Metals and Alloys Geotechnical Engineering and Engineering Geology Condensed Matter Physics Bayer process Oxalate Red mud chemistry.chemical_compound Materials Chemistry Photocatalysis Crystallite Irradiation
Zdroj:	Transactions of Nonferrous Metals Society of China. 22:456-460
ISSN:	1003-6326
DOI:	10.1016/s1003-6326(11)61198-9
Popis:	Red-mud is the residue from the Bayer process, in which the iron minerals should be removed before red-mud is used to produce refractory materials. The iron minerals in red-mud were extracted by oxalic acid solution. The content of Fe (calculated in Fe2O3) in red-mud was reduced from 17.6% to less than 1% after being treated by 1 mol/L oxalic acid solution at 75 °C for 2 h. The Fe(III) oxalate solution obtained was then irradiated by UV light, resulting in the precipitation of Fe(II) oxalate. Under UV photocatalysis, more than 90% of Fe(III) oxalate in the extracted solution was transformed into the precipitation of Fe(II) oxalate crystallite (β-FeC2O4·2H2O). The filtrate from the Fe(II) oxalate precipitate filtration could be reused in the next cycle. The mechanism of UV photocatalysis precipitation was also discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b01c62b8bd56f629b1caf77feaec0aa7 https://doi.org/10.1016/s1003-6326(11)61198-9 Zobrazit plný text záznamu Full Text from ScienceDirect