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

Guo Chen; Qi Jiang; Kangqiang Li; Aoxi He; Jinhui Peng; Mamdouh Omran; Jin Chen

doi: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

J Hazard Mater. 2020 Apr 15:388:122039. doi: 10.1016/j.jhazmat.2020.122039. Epub 2020 Jan 10.

Authors

Guo Chen¹, Qi Jiang², Kangqiang Li¹, Aoxi He³, Jinhui Peng¹, Mamdouh Omran⁴, Jin Chen⁵

Affiliations

¹ Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, Kunming Key Laboratory of Energy Materials Chemistry, Yunnan Minzu University, Kunming 650500, PR China; Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming University of Science and Technology, Kunming 650093, PR China.
² Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming University of Science and Technology, Kunming 650093, PR China.
³ Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, Kunming Key Laboratory of Energy Materials Chemistry, Yunnan Minzu University, Kunming 650500, PR China; Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming University of Science and Technology, Kunming 650093, PR China. Electronic address: yan9249@vip.qq.com.
⁴ Process Metallurgy Research Group, Faculty of Technology, University of Oulu, Finland.
⁵ Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, Kunming Key Laboratory of Energy Materials Chemistry, Yunnan Minzu University, Kunming 650500, PR China; Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming University of Science and Technology, Kunming 650093, PR China; State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Pangang Group Research Institute Co., Ltd., Panzhihua 617000, PR China. Electronic address: realchenguo@aliyun.com.

PMID: 31954310
DOI: 10.1016/j.jhazmat.2020.122039

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.

Keywords: Chromium; Rutile TiO(2); Sodium carbonate decomposition; Titanium slag; Vanadium.