Abstract
A two-stage aluminothermic reduction process for preparing Ti powder under vacuum conditions using Na2TiF6 was investigated. An Al-Ti master alloy and a clean cryolite were simultaneously obtained as co-products. The first-stage reduction was an exothermic process that occurred at approximately 660°C. The Al and O contents of the Ti powder product were 0.18 wt.% and 0.35 wt.%, respectively, with an average particle size <74 μm. Ti(IV), Ti(III), and metallic Ti were present in the Ti-containing cryolite produced by the first-stage reduction, at a total content of approximately 3.13 wt.%. After second-stage reduction, the Ti elemental contents of the clean cryolite were reduced to 0.002 wt.%. The Al-Ti master alloy obtained by second-stage reduction was composed of Al and TiAl3. The mechanisms involved in these reduction processes were also examined.
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Acknowledgements
This work was supported in part by the National Natural Science Foundation of China (Grant No. 51674076) and the State Key Development Program for Basic Research of China (973 Program, Grant No. 2013CB632606-1).
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Zhao, K., Wang, Y. & Feng, N. Cleaner Production of Ti Powder by a Two-Stage Aluminothermic Reduction Process. JOM 69, 1795–1800 (2017). https://doi.org/10.1007/s11837-017-2337-3
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DOI: https://doi.org/10.1007/s11837-017-2337-3