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Citation: LIU Changjiang, MA Hongwen, ZHANG Pan. Thermodynamics of the Hydrothermal Decomposition Reaction of Potassic Syenite with Zeolite Formation[J]. Acta Physico-Chimica Sinica, ;2018, 34(2): 168-176. doi: 10.3866/PKU.WHXB201707111 shu

Thermodynamics of the Hydrothermal Decomposition Reaction of Potassic Syenite with Zeolite Formation

1.
School of Materials Science and Technology, China University of Geosciences, Beijing 100083, P. R. China;
2.
Blue Sky Technology Corporation, Beijing 100083, P. R. China

Received Date: 5 June 2017
Revised Date: 26 June 2017

Fund Project: The project was supported by the Fundamental Research Funds for the Central Universities (2652015371) and China Geological Survey Project (12120113087700).

The thermodynamics of hydrothermal decomposition reaction of potassic syenite,collected from Anhui province,China,with the formation of zeolites was studied in this work.The phase equilibrium model of the potassic syenite-NaOH-H₂O hydrothermal system was constructed by the combination of "mixed solvent electrolyte model" and thermodynamic data of mineral end-members,as well as zeolites species,which was calculated from the"polymer model".According to the Gibbs free energy of reaction,the decomposition of potassic syenite into hydroxycancrinite,analcime,zeolite P,and zeolite A occurs spontaneously within the temperature range of 160-300℃.The formation conditions of hydroxycancrinite and analcime were predicted from the simulation of phase equilibrium by OLI Analyzer 9.3 software.After experimental verification,analcime (regular tetragonal trisoctahedron,~50 μm) and hydroxycancrinite (columnar crystals,~20 μm in length,500 nm-1 μm in diameters) were respectively obtained with >97% K₂O leaching.
- Potassic syenite,
- Alkali-hydrothermal method,
- Zeolite,
- Chemical equilibrium,
- Thermodynamics
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