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Towards a sustainable technology for production of extra-pure Ti metal:Electrolysis of sulfurized Ti(C,N)in molten CaCl_(2)

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International Journal of Minerals,Metallurgy and Materials 2020年第12期27卷 1635-1643页

作者： eltefat ahmadi Ryosuke O.Suzuki Tatsuya Kikuchi Takumi Kaneko Yuta Yashima Division of Materials Science and Engineering Faculty of EngineeringHokkaido UniversitySapporo 060-8628Japan Japan Society for the Promotion of Science(JSPS) Tokyo 102-0083Japan

A new concept for producing highly pure Ti metal powder from ilmenite(FeTiO)_(3))is proposed in this *** nitride(TiN)or titanium oxycarbonitride(TiO_(x)C_(y)N_(z))could be synthesized in the first step via the simultaneous carbothermal reduction and nitridation(CTRN)of FeTiO3 to remove oxygen *** separate oxygen completely,high-quality TiS2 samples were then synthesized from TiN and TiC using S2 gas,and the clean sulfides were finally reduced toα-Ti powders with spherical morphology using electrolysis in molten CaCl_(2).Xray diffraction(XRD),scanning electron microscopy(SEM)in conjunction with energy-dispersive X-ray spectroscopy(EDS),and elemental LECO analysis were used to study the phases and microstructures of the sulfides and the electrochemically reduced *** Ti powder showed no carbon contamination and consisted of high-purity foil-like Ti sheets with very low oxygen,carbon,and nitrogen contents of less than 0.15 wt%O,0.02 wt%C,and 0.003 wt%N,*** quality of the Ti powder was much higher than that of the powder obtained using the conventional OS process(proposed by *** and ***)starting directly from the oxides.

关键词： titanium molten salt electrolysis sulfidation titanium oxycarbonitride ilmenite

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Synthesis of titanium oxycarbonitride by carbothermal reduction and nitridation of ilmenite with recycling of polyethylene terephthalate (PET)

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International Journal of Minerals,Metallurgy and Materials 2017年第4期24卷 444-454页

作者： eltefat ahmadi Ahmad Fauzi Hashim Hussin Norlia Baharun Kamar Shah Ariffin Sheikh Abdul Rezan School of Materials & Mineral Resources Engineering Universiti Sains Malaysia Engineering Campus 14300 Nibong Tebal Penang Malaysia

An innovative and sustainable carbothermal reduction and nitridation(CTRN) process of ilmenite(FeTiO_3) using a mixture of polyethylene terephthalate(PET) and coal as the primary reductant under an H_2–N_2 atmosphere was proposed. The use of PET as an alternative source of carbon not only enhances the porosity of the pellets but also results in the separation of Fe from titanium oxycarbonitride(TiOxCyNz) particles because of the differences in surface tension. The experiments were carried out at 1250°C for 3 h using four different PET contents ranging from 25wt% to 100wt% in the reductant. X-ray diffraction(XRD),scanning electron microscopy(SEM) in conjunction with energy-dispersive X-ray spectroscopy(EDX),and LECO elemental analysis were used to study the phases and microstructures of the reduced samples. In the case of 75wt% PET,iron distinctly separated from the synthesized Ti OxCyNz phase. With increasing PET content in the sample,the reduction and nitridation rates substantially increased. The synthesis of an oxycarbonitride with stoichiometry of TiO_(0.02)C_(0.13)N_(0.85) with minimal intermediate titanium sub-oxides was achieved. The results also showed that the iron particles formed from CTRN of FeTiO_3 exhibited a spherical morphology,which is conducive for Fe removal via the Becher process.

关键词： carbothermal reduction nitridation polyethylene terephthalate titanium oxycarbonitride ilmenite

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Nanostructured MnO_2 synthesized via methane gas reduction of manganese ore and hydrothermal precipitation methods

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Transactions of Nonferrous Metals Society of China 2013年第1期23卷 134-139页

作者： Davood MORADKHANI Mahdieh M ALEKZADEH eltefat ahmadi Faculty of Engineering Islamic Azad UniversityZanjan BranchP.O.Box 45156-58145ZanjanIran Research and Engineering Company for Non-ferrous M etals(RECo) P.O.Box 45195-1445ZanjanIran

A three-stage methane gas （CH4） reduction of manganese ore, dissolution, and precipitation from solution procedure was conducted to synthesize MnO2 nanorods. Methane gas reduction was carried out at 850, 875, 900, 925, and 950℃ for 120 min. Precipitation of the a-MnO2 nanorods was performed in the temperature range of 25-90℃with a constant reaction time of 90 min. The morphology and particle size of the products were determined from scanning electron microscope （SEM） images and X-ray diffraction （XRD） patterns. The BET and BJH of the products were found out by the surface area analyzer. Reduction results indicated that MnO-rich phase is significantly formed at 950℃ as MnO2 phase disappears. Precipitation results also showed an average diameter size of - 50 nm for the embedding a-MnO2 nanorods with BET surface area of 174 m^2/g.

关键词： manganese dioxide nanorods methane gas reduction precipitation

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