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Metals 2019, 9(2), 169; https://doi.org/10.3390/met9020169

Removal of Mg and MgO By-Products through Magnesiothermic Reduction of Ti Powder in Self-Propagating High-Temperature Synthesis

1
Korea Institute for Rare Metals, Korea Institute of Industrial Technology, Incheon 21999, Korea
2
Department of Advanced Materials Engineering, In-Ha University, Incheon 22212, Korea
3
Department of Chemical Engineering, In-Ha University, Incheon 22212, Korea
*
Author to whom correspondence should be addressed.
Received: 2 January 2019 / Revised: 28 January 2019 / Accepted: 29 January 2019 / Published: 1 February 2019
(This article belongs to the Special Issue Metals Powders: Synthesis and Processing)
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Abstract

Commercial production of titanium involves chlorination using chlorine gas that can be converted to hydrochloric acid by atmospheric moisture and is hazardous to human health. In the titanium production process, self-propagating high-temperature synthesis is one of the process to directly reduce titanium dioxide. In this work, titanium powder was prepared by self-propagating high-temperature synthesis using titanium dioxide as the starting material and magnesium powder as a reducing agent. After the reaction, magnesium and magnesium oxide by-products were then removed by acid leaching under different leaching conditions, leaving behind pure Ti. During each leaching condition, the temperature of the leaching solution was carefully monitored. After leaching, the recovered titanium in the form of a powder was collected, washed with water and dried in a vacuum oven. Detailed compositional, structural, and morphological analyses were performed to determine the presence of residual reaction by-products. It was found that leaching in 0.4 M hydrochloric acid followed by second leaching in 7.5 M hydrochloric acid is the optimum leaching condition. Furthermore, it was also noticed that total volume of solution in 0.4 M hydrochloric acid leaching condition is advantageous to maintain uniform temperature during the process. View Full-Text
Keywords: titanium powder; self-propagating high-temperature synthesis; acid leaching; magnesium; magnesium oxide titanium powder; self-propagating high-temperature synthesis; acid leaching; magnesium; magnesium oxide
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Choi, S.H.; Sim, J.J.; Lim, J.H.; Seo, S.-J.; Kim, D.-W.; Hyun, S.-K.; Park, K.-T. Removal of Mg and MgO By-Products through Magnesiothermic Reduction of Ti Powder in Self-Propagating High-Temperature Synthesis. Metals 2019, 9, 169.

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