Phase Transition of Ilmenite in the Environment of Concrete Pore Solution

BAI Long; FENG Xiaoxin; LIU Gang

doi:10.3969/j.issn.1000-6532.2024.05.024

2024 Vol. 45, No. 5

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Article navigation > Multipurpose Utilization of Mineral Resources > 2024 > 45(5): 168-175

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BAI Long, FENG Xiaoxin, LIU Gang. Phase Transition of Ilmenite in the Environment of Concrete Pore Solution[J]. Multipurpose Utilization of Mineral Resources, 2024, 45(5): 168-175. doi: 10.3969/j.issn.1000-6532.2024.05.024

Citation:

BAI Long, FENG Xiaoxin, LIU Gang. Phase Transition of Ilmenite in the Environment of Concrete Pore Solution[J]. Multipurpose Utilization of Mineral Resources, 2024, 45(5): 168-175. doi: 10.3969/j.issn.1000-6532.2024.05.024

Phase Transition of Ilmenite in the Environment of Concrete Pore Solution

College of Materials Science and Engineering, North China University of Science and Technology, Hebei Laboratory of Inorganic Non-metallic Materials, Hebei Province Technology Innovation Center for Comprehensive Utilization of Industrial Solid Wastes, Tangshan 063210, Hebei, China

More Information

Corresponding author: FENG Xiaoxin, fxx@ncst.edu.cn

Received Date: 15 January 2022

Publish Date: 25 October 2024

Abstract

Abstract

This is an article in the field of ceramics and composites. Taking ilmenite ore as the research object, the possible phase transformation of FeTiO₃ in concrete liquid phase environment was analyzed in order to provide a basis for the utilization of ilmenite tailings. The thermodynamic stability of ilmenite (FeTiO₃) was analyzed by thermodynamic calculation. Ilmenite ore powder was soaked in simulated concrete pore solution at 20 ℃ and 80 ℃ for 28 d and 270 d, XRD and SEM/EDS were used to detect mineral transformation. Using ilmenite ore to replace part of the gravel to prepare concrete, the influence on concrete strength at 20 ℃ and 80 ℃ was studied respectively. The results of thermodynamic calculations show that FeTiO₃ is unstable in the environment of O₂ and converts into Fe₃O₄ or Fe₂O₃ and TiO₂. The immersion experiment of ilmenite in the simulated concrete pore solution shows that ilmenite has no obvious changes. The concrete strength test shows that at 20 ℃ and 80 ℃, when ilmenite ore replaces 5% crushed stone, the compressive strength of concrete increases, and when the replacement is 15%, the compressive strength decreases, the reason is that the quartz in the ilmenite ore has undergone an alkali aggregate reaction.
- Ceramics and composites /
- Ilmenite /
- Concrete pore solution /
- Phase transformation /
- Concrete /
- Strength

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References

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