University of Oulu

Guo Chen, Qi Jiang, Kangqiang Li, Aoxi He, Jinhui Peng, Mamdouh Omran, Jin Chen, Simultaneous removal of Cr(III) and V(V) and enhanced synthesis of high-grade rutile TiO2 based on sodium carbonate decomposition, Journal of Hazardous Materials, Volume 388, 2020, 122039, ISSN 0304-3894, https://doi.org/10.1016/j.jhazmat.2020.122039

Simultaneous removal of Cr(III) and V(V) and enhanced synthesis of high-grade rutile TiO₂ based on sodium carbonate decomposition

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Author: Chen, Guo1,2; Jiang, Qi2; Li, Kangqiang1,2;
Organizations: 1Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, Kunming Key Laboratory of Energy Materials Chemistry, Yunnan Minzu University, Kunming 650500, PR China
2Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming University of Science and Technology, Kunming 650093, PR China
3Process Metallurgy Research Group, Faculty of Technology, University of Oulu, Finland
4State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Pangang Group Research Institute Co., Ltd., Panzhihua 617000, PR China
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2020040710700
Language: English
Published: Elsevier, 2020
Publish Date: 2022-01-10
Description:

Abstract

Rutile TiO₂ is widely applied as the raw material to produce titanium dioxide and titanium sponge, whereas the Cr (III) and V (V) impurities in rutile TiO₂ significantly affect the performance of related products. In the present work, the sodium carbonate decomposition treatment on Panzhihua titanium slag was attempted, to improve the preparation process of rutile TiO₂ with high crystallinity and simultaneously reduce the chromium (Cr) and vanadium (V) content as hazardous elements. Effects of sodium carbonate decomposition treatment on the crystal composition, microstructure of rutile TiO₂ were determined using XRD, SEM and Raman characterization. The recovery of Cr(III) and V(V) was achieved through leaching the roasted titanium slag by dilute sulfuric acid, with the chromium and vanadium content in the residue decreasing up to 0.03 % and 0.04 %, respectively, followed by the final product rutile TiO₂ was produced by the leaching residue calcined at 1323.15 K with a duration time of 120 min, with 85.56 % of TiO₂ grade. The work highlights the feasibility of synchronously preparing rutile TiO₂ and removing hazardous Cr (III) and V (V) impurities from titanium slag using sodium carbonate decomposition.

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Series: Journal of hazardous materials
ISSN: 0304-3894
ISSN-E: 1873-3336
ISSN-L: 0304-3894
Volume: 388
Article number: 122039
DOI: 10.1016/j.jhazmat.2020.122039
OADOI: https://oadoi.org/10.1016/j.jhazmat.2020.122039
Type of Publication: A1 Journal article – refereed
Field of Science: 218 Environmental engineering
Subjects:
Funding: The authors acknowledge the financial supports from the National Natural Science Foundation of China (No: U1802255, 51504110 and 51424114), Yunnan Applied Basic Research Project of China (No: 2017FD117) and Innovative Research Team (in Science and Technology) in University of Yunnan Province were sincerely acknowledged.
Copyright information: © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
  https://creativecommons.org/licenses/by-nc-nd/4.0/