TY - JOUR
T1 - A New Approach to Processing Rutile from Ilmenite Ore Utilizing the Instability of Pseudobrookite
AU - Kumagai, Naoki
AU - Hiraki, Takehito
AU - Pal, Uday B.
AU - Kasai, Eiki
AU - Nagasaka, Tetsuya
N1 - Funding Information:
Financial supports as the Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS) in 2014 and 2015 (Contract Number 26630374), and Interdepartmental Doctoral Degree Program for Multi-dimensional Materials Science Leaders, Tohoku University Program for Leading Graduate School are gratefully acknowledged. The authors also wish to thank Ms. Jonah Longaquit-Gamutan, of the Graduate School of Engineering, Tohoku University, and the Interdepartmental Doctoral Degree Program for Multi-dimensional Materials Science Leaders, Tohoku University Program for Leading Graduate Schools, for their help and support. Manuscript submitted June 26, 2017.
Funding Information:
Financial supports as the Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS) in 2014 and 2015 (Contract Number 26630374), and Interdepartmental Doctoral Degree Program for Multi-dimensional Materials Science Leaders, Tohoku University Program for Leading Graduate School are gratefully acknowledged. The authors also wish to thank Ms. Jonah Longaquit-Gamu-tan, of the Graduate School of Engineering, Tohoku University, and the Interdepartmental Doctoral Degree Program for Multi-dimensional Materials Science Leaders, Tohoku University Program for Leading Graduate Schools, for their help and support.
Publisher Copyright:
© 2018, The Minerals, Metals & Materials Society and ASM International.
PY - 2018/10/1
Y1 - 2018/10/1
N2 - Rutile (TiO2) is a vital industrial material used in pigments and in many other valuable chemicals. A new production process to synthesize rutile from natural ilmenite ore and therefore overcome the environmental problems associated with conventional rutile extraction processes was developed. Because the simple phase separation of ilmenite (FeTiO3) into Fe2O3 and TiO2 occurs due to air oxidation, extracting TiO2 by removing Fe2O3 may be possible if pseudobrookite (Fe2TiO5), known as a stable compound in the Fe2O3-TiO2 system at higher temperatures, is of unstable phase in the lower-temperature range. In order to clarify the potential of this new approach, the phase stability of pseudobrookite in the lower-temperature range is discussed. The free energy of formation of pseudobrookite from the respective pure oxides was measured at temperatures ranging from 1073 K to 1473 K by the chemical equilibrium technique using Al2O3 as the reference oxide. The observed free energy is given as a function of temperature: ∆G0 = 7715 − 7.7T (J/mol). The results indicate that pseudobrookite has an unstable phase below 929 K. This has important industrial implications as a new approach to producing synthetic rutile from ilmenite ore by oxidation at low temperatures and acid leaching.
AB - Rutile (TiO2) is a vital industrial material used in pigments and in many other valuable chemicals. A new production process to synthesize rutile from natural ilmenite ore and therefore overcome the environmental problems associated with conventional rutile extraction processes was developed. Because the simple phase separation of ilmenite (FeTiO3) into Fe2O3 and TiO2 occurs due to air oxidation, extracting TiO2 by removing Fe2O3 may be possible if pseudobrookite (Fe2TiO5), known as a stable compound in the Fe2O3-TiO2 system at higher temperatures, is of unstable phase in the lower-temperature range. In order to clarify the potential of this new approach, the phase stability of pseudobrookite in the lower-temperature range is discussed. The free energy of formation of pseudobrookite from the respective pure oxides was measured at temperatures ranging from 1073 K to 1473 K by the chemical equilibrium technique using Al2O3 as the reference oxide. The observed free energy is given as a function of temperature: ∆G0 = 7715 − 7.7T (J/mol). The results indicate that pseudobrookite has an unstable phase below 929 K. This has important industrial implications as a new approach to producing synthetic rutile from ilmenite ore by oxidation at low temperatures and acid leaching.
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U2 - 10.1007/s11663-018-1348-y
DO - 10.1007/s11663-018-1348-y
M3 - Article
AN - SCOPUS:85050663641
SN - 1073-5615
VL - 49
SP - 2278
EP - 2284
JO - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
JF - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
IS - 5
ER -