Scale-Up Study of Deoxidation of Off-Grade Titanium Sponge Using Magnesium Metal Under Argon and Hydrogen Mixed Gas Atmosphere

To develop an efficient and cost-effective process for recycling off-grade titanium (Ti) sponge, the scale-up study of deoxidation of off-grade Ti sponge using magnesium (Mg) metal under argon (Ar) and hydrogen (H 2 ) mixed gas was conducted. In the experiments, titanium hydride (TiH 2 ) produced by...

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Bibliographic Details
Published in:Journal of sustainable metallurgy 2023-06, Vol.9 (2), p.497-510
Main Authors: Park, Sung-Hun, Lim, Kyung-Hwan, Na, Hyunjin, Lee, Tae-Hyuk, Sohn, Ho-Sang, Kang, Jungshin
Format: Article
Language:English
Subjects:
Argon
Deoxidizing
Earth and Environmental Science
Environment
Magnesium
Magnesium chloride
Metallic Materials
Mixtures
Molten salts
Potassium chloride
Raw materials
Research Article
Sustainable Development
Titanium
Titanium compounds
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Summary:To develop an efficient and cost-effective process for recycling off-grade titanium (Ti) sponge, the scale-up study of deoxidation of off-grade Ti sponge using magnesium (Mg) metal under argon (Ar) and hydrogen (H 2 ) mixed gas was conducted. In the experiments, titanium hydride (TiH 2 ) produced by the hydrogenation of an off-grade Ti sponge was used as the feedstock. The deoxidation of TiH 2 was performed at 933 K for 12 h using Mg metal in magnesium chloride and potassium chloride molten salt under Ar and 10% H 2 mixed gas atmosphere. The influence of production scale on the concentration of oxygen (O) in the obtained residues was investigated by increasing the amount of TiH 2 feedstock up to 2500 g/batch. After the deoxidation process, a mixture of Ti and TiH 2 was obtained, and the O concentration in the mixture decreased from 11750 to 1480 ppm under certain conditions. The results demonstrate that the deoxidation of TiH 2 using Mg metal under Ar and H 2 mixed gas can decrease the O concentration in an off-grade Ti sponge below 1800 ppm, even though the production scale increased under optimal conditions. Graphical Abstract
ISSN:2199-3823
2199-3831
DOI:10.1007/s40831-023-00662-9