物理化学学报2018，Vol.34Issue(2)：168-176,9.DOI:10.3866/PKU.WHXB201707111
富钾正长岩水热分解生成沸石反应热力学
Thermodynamics of the Hydrothermal Decomposition Reaction of Potassic Syenite with Zeolite Formation
摘要
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°C. 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.关键词
富钾正长岩/水热碱法/沸石/化学平衡/热力学Key words
Potassic syenite/Alkali-hydrothermal method/Zeolite/Chemical equilibrium/Thermodynamics分类
化学化工引用本文复制引用
刘昶江,马鸿文,张盼..富钾正长岩水热分解生成沸石反应热力学[J].物理化学学报,2018,34(2):168-176,9.基金项目
中央高校基本科研业务项目(2652015371)和中国地质调查项目(12120113087700)资助 （2652015371）
The project was supported by the Fundamental Research Funds for the Central Universities(2652015371)and China Geological Survey Project(12120113087700). （2652015371）
