钾长石热分解热力学分析和ΔG°_T计算

Thermodynamic Analysis of Thermal Decomposition of Potash Feldspar and Calculation of ΔGT

利用热力学数据及ＣａＯ－Ａｌ２Ｏ３－ＳｉＯ２、Ｋ２Ｏ－Ａｌ２Ｏ３－ＳｉＯ２体系相图，对钾长石分别添加ＣａＯ、ＣａＳＯ４、ＣａＣｌ２、ＣａＯ＋ＣａＣｌ２和ＣａＯ＋ＣａＳＯ４下的热分解进行了热力学分析，并拟定了５２０个可能反应，在８００～１６００Ｋ范围内计算了各反应的ΔＧＴ，确定了添加ＣａＯ＋ＣａＳＯ４制取Ｋ２ＳＯ４的物料配比范围，并以此指导工艺实验。

A thermodynamic analysis is made of the thermal decomposition of potash feldspar with the addition of CaO, CaSO_4, CaCl_2, CaO+CaCl_2 or CaO+CaSO_4, making use of thermodynamic data and phase diagrams of CaO-Al_2O_3-SiO_2 and K_2O-Al_2O_3-SiO_2 systems, and 520 possible reactions are worked out. The ΔGT of each reaction is calculated in the range of 800～1 600K, and the material proportioning range for the addition of CaO+CaSO4 in the production of K2SO4 is established, which is used to guide process experiments.