Recovery of titanium from undissolved residue (tionite) in titanium oxide industry via NaOH hydrothermal conversion and H2SO4 leaching

doi:10.1016/S1003-6326(16)64247-4

Transactions of Nonferrous Metals Society of China

Volume 26, Issue 6, June 2016, Pages 1696-1705

https://doi.org/10.1016/S1003-6326(16)64247-4 Get rights and content

Abstract

To recover titanium from tionite, a new process consisting of NaOH hydrothermal conversion, water washing, and H₂SO₄ leaching for TiO₂ preparation was developed. The experimental results show that under the optimum hydrothermal conversion conditions, i.e., 50% NaOH (mass fraction) solution, NaOH/tionite mass ratio of 4:1, reaction temperature of 240 °C, reaction time of 1 h and oxygen partial pressure of 0.25 MPa, the titanium was mainly converted into Na₂TiO₃, and the conversion was 97.2%. The unwanted product Na₂TiSiO₅ remained stable in water washing, and its formation was prevented by improving NaOH concentration. In water washing process, about 97.6% of Na⁺ could be recycled by washing the hydrothermal product. The NaOH solutions could be reused after concentration. 96.7% of titanium in the washed product was easily leached in H₂SO₄ solution at low temperatures, forming titanyl sulfate solution to further prepare TiO₂.

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: Foundation item: Project (51090380) supported by the National Natural Science Foundation of China; Projects (2013CB632604, 2013CB632601) supported by the National Basic Research Program of China; Project (51125018) supported by the National Science Foundation for Distinguished Young Scholars of China; Project (KGZD-EW-201-2) supported by the Key Research Program of the Chinese Academy of Sciences; Projects (51374191, 51402303) supported by the Natural Science Foundation for the Youth, China

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Recovery of titanium from undissolved residue (tionite) in titanium oxide industry via NaOH hydrothermal conversion and H2SO4 leaching

Abstract

Transactions of Nonferrous Metals Society of China

Dyes and Pigments

Transactions of Nonferrous Metals Society of China

Hydrometallurgy

Transactions of Nonferrous Metals Society of China

Journal of Hazardous Materials

Journal of Hazardous Materials

Ceramics International

Journal of the European Ceramic Society

Journal of Environmental Management

International Journal of Mineral Processing

Transactions of Nonferrous Metals Society of China

Transactions of Nonferrous Metals Society of China

Hydrometallurgy

Hydrometallurgy

Hydrometallurgy

Fluid Phase Equilibria

Recovery of titanium from undissolved residue (tionite) in titanium oxide industry via NaOH hydrothermal conversion and H₂SO₄ leaching