中温分解钾长石的热力学分析与实验

综合介绍了利用助剂分解钾长石的研究现状。通过热力学计算预测以碳酸钠、碳酸钾为助剂分解钾长石的分解反应温度在800～890℃之间。分解反应机理的分析表明：随着焙烧温度的升高。钾长石由单一的焙烧分解状态进入分解和烧结同时进行的状态，实验表明：钾长石矿的分解率达98％以上。以碳酸钠、碳酸钾为助剂在820～850℃即可使钾长石分解。

THERMODYNAMIC ANALYSIS AND EXPERIMENTS OF THERMAL DECOMPOSITION FOR POTASSIUM FELDSPAR AT INTERMEDIATE TEMPERATURES

Advances on thermal decomposition of potassium feldspar with flux agents are reviewed.Thermodynamic calculation shows that the temperature range of the thermal decomposition of potassium feldspar is 800-890 ℃ with stoichiometric additive of sodium carbonate or potassium carbonate.Analysis on the mechanism of thermal decomposition reaction shows that with increasing the calcination temperature,potassium feldspar passes through a stage predominated by single decomposition entering that predominated by decomposition and sinter simultaneously.Decomposition proportions of various potassium feldspar powder materials determined are over 98%.This shows that with stoichiometric additive of sodium carbonate or potassium carbonate,the potassium feldspar can be decomposed at 820-850 ℃.