Feasibility study of the new rutile extraction process from natural ilmenite ore based on the oxidation reaction |
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| Authors: | Satoshi Itoh Shogo Sato Junji Ono Hidehiko Okada Tetsuya Nagasaka |
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| Affiliation: | (1) the Department of Environmental Studies Graduate School of Environmental Studies, Tohoku University, 980-8579 Sendai, Japan;(2) the Department of Metallurgy, Graduate School of Engineering, Tohoku University, Japan;(3) with Dowa Mining Co. Ltd., 1-3-1 Kaigan-dori, Okayama, Japan;(4) Tohoku University, Japan;(5) with NSK Ltd., 1-5-50 Kugenuma-Shinmei, Fujisawa, Japan;(6) the National Institute for Materials Science, 3-13 Sakura, Tsukuba, Japan;(7) the Graduate School of Environmental Studies, Tohoku University, Japan |
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| Abstract: | ![]()
Phase relations in the Fe2O3-FeTiO3-TiO2 system were investigated by equilibrating synthetic samples in evacuated sealed quartz tubes at a temperature of 1373 K. The equilibrium partial pressure of oxygen was measured by the electromotive force (EMF) method in the temperature range of 1273 to 1373 K. The phase diagram and oxygen partial pressure diagram in the titanium-iron-oxygen ternary system were then constructed at 1373 K. Rutile extraction from natural ilmenite ore was discussed from the thermodynamic viewpoint. It is found that rutile can be produced from common natural ilmenite ores not only by the reduction as the conventional titanium-rich slag process but also by an oxidation. Then, the oxidation experiment was conducted in air using Australian ilmenite ore to obtain rutile as one of the coexistent phases. Magnetic separation and leaching experiments for synthesized pseudobrookite and reagent rutile were conducted to confirm the possibility of separation of rutile from pseudobrookite. A new rutile extraction process was then proposed. |
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