Synthesis of rutile TiO2 powder by microwave-enhanced roasting followed by hydrochloric acid leaching

Juanxue Kang, Lei Gao, Mingyuan Zhang, Jing Pu, Lin He, Rongsheng Ruan, Mamdouh Omran, Jinhui Peng, Guo Chen

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

In this paper, the preparation of rutile TiO2 powder from titanium slag by microwave-assisted activation roasting followed by hydrochloric acid leaching was investigated. The effects of the additive Na2CO3 on the crystal form, cell, crystallinity, phase transformation, surface functional groups and micro-surface structure of the calcined product were systematically studied using X-ray powder diffraction, Raman spectroscopy, Fourier-transform infrared spectroscopy, and scanning electron microscopy. The results confirmed that the strongest characteristic Raman bands of rutile TiO2 and the weakest FT-IR bands of (CO3)−2 were found when the Na2CO3 mass ratio was 0.4. Accordingly, the crystallinity for the product, namely short rod structure rutile TiO2 powder, reached its peak value of 99.21% with a corresponding average grain size of 43.5 nm. The excessive Na2CO3 was found to be disadvantageous for the crystallinity of the product, since it formed a coverage on the surface of titanium slag which prevented the oxidation reaction for the decomposition of anosovite.

Original languageEnglish (US)
Pages (from-to)1140-1147
Number of pages8
JournalAdvanced Powder Technology
Volume31
Issue number3
DOIs
StatePublished - Mar 2020

Keywords

  • Hydrochloric acid
  • Microwave roasting
  • NaCO
  • Phase transformation
  • Rutile TiO

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