Synthesis of Al-Substituted 11Å Tobermorite from Aegirine-Augite Syenite Potash Ores by Hydrothermal Reaction at 300°C

Yu Qin Liu; Hong Tu Xia; Hong Wen Ma

doi:10.4028/www.scientific.net/MSF.694.788

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HomeMaterials Science ForumMaterials Science Forum Vol. 694Synthesis of Al-Substituted 11Å Tobermorite from...

Synthesis of Al-Substituted 11Å Tobermorite from Aegirine-Augite Syenite Potash Ores by Hydrothermal Reaction at 300°C

Abstract:

The Al-substituted 11Å tobermorite was synthesized from aegirine-augite syenite potash ores by alkaline hydrothermal reaction at 300°C. The obtained tobermorite was characterized by chemical analysis, X-ray diffraction and scanning electron microscopy. The effect of reaction time on the tobermorite formation and the dissolution ratio of the K2O in the potash ores were investigated. It was revealed that the dislocation ratio of K₂O increases with increasing reaction time. The main rock constituents were converted into a well-crystallized Al-substituted 11Å tobermorite after 3 hours hydrothermal reaction at 300°C. The obtained Al-substituted tobermorite forms hollow spherical aggregates with the diameter of 40µm-80µm by the crossing of fibrous tobermorite crystal together. The Al³⁺ may substitute isomorphously up to 15 at % of Si ⁴⁺ in the obtained tobermorite.

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Periodical:

Materials Science Forum (Volume 694)

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788-793

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.694.788

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Online since:

July 2011

Authors:

Yu Qin Liu, Hong Tu Xia, Hong Wen Ma

Keywords:

Aegirine-Augite Syenite, Al-Substituted Tobermorite, Hydrothermal Reaction

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