富钾正长岩水热分解生成沸石反应热力学

doi:10.3866/PKU.WHXB201707111

Abstract

Abstract:

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.

Key words: Potassic syenite, Alkali-hydrothermal method, Zeolite, Chemical equilibrium, Thermodynamics

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

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

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