中温分解钾长石的热力学分析与实验(英文)  

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

作　　者：冯武威[1] 马鸿文[1] 

机构地区：[1]中国地质大学材料科学与工程学院,北京100083

出　　处：《硅酸盐学报》2004年第7期789-799,共11页Journal of The Chinese Ceramic Society

基　　金：教育部博士学科点基金项目(1999049114)

摘　　要：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。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°C 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°C.

关 键 词：钾长石 分解率 碳酸钠 碳酸钾 助剂 

分 类 号：P578.968[天文地球—矿物学] TQ443.5[天文地球—地质学]