Production of Fe–Ti Alloys from Mixed Slag Containing Titanium and Fe2O3 via Direct Electrochemical Reduction in Molten Calcium Chloride
Autor: | Shi-yu Wang, Junqi Li, Chao-yi Chen, Yuan-Pei Lan, Lin-zhu Wang, Bo Wang |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
lcsh:TN1-997
Materials science FeTi4 Alloy 0211 other engineering and technologies Intermetallic chemistry.chemical_element 02 engineering and technology engineering.material law.invention FETI ferro-titanium alloy law General Materials Science Molten salt lcsh:Mining engineering. Metallurgy 021102 mining & metallurgy Keywords: waste slag containing titanium Electrolysis Metals and Alloys Slag 021001 nanoscience & nanotechnology chemistry Chemical engineering visual_art molten salt electrolysis visual_art.visual_art_medium engineering Atomic ratio 0210 nano-technology Titanium |
Zdroj: | Metals Volume 10 Issue 12 Metals, Vol 10, Iss 1611, p 1611 (2020) |
ISSN: | 2075-4701 |
DOI: | 10.3390/met10121611 |
Popis: | High-purity intermetallic &beta Ti (FeTi4) and FeTi alloys were prepared via molten salt electrolysis from a titanium-containing waste slag and Fe2O3 mixture using molten CaCl2 salt as the electrolyte. The mixed slag powders were pressed into a pellet that served as a cathode, while a graphite rod served as an anode. The electrochemical process was conducted at 900 ° C with a cell voltage of 3.1 V under an inert atmosphere. The formation process of the alloys and the influence of the Ti:Fe atomic ratio on the product were investigated. With an increased proportion of Ti, the phase of the product changed from FeTi/Fe2Ti to FeTi/FeTi4, and different structures were observed. At a Ti:Fe ratio of 1.2:1 in the raw slag, an alloy with a sponge-like morphology and a small amount of FeTi4 were obtained. During the initial stages of electrolysis, a large amount of intermediate product (CaTiO3) was formed, accompanied by an abrupt decrease in current and increase in particle size. The current then increased and Fe2Ti alloy was gradually formed. Finally, as the reaction process extended inside the pellet, the current remained stable and the product mainly contained FeTi and FeTi4 phases. The observed stages, i.e., CaTiO3(TiO2) &rarr Fe2Ti(Ti) &rarr FeTi(FeTi4), were consistent with the thermodynamic analysis. |
Databáze: | OpenAIRE |
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