高等学校化学学报 ›› 1998, Vol. 19 ›› Issue (3): 345.

• 论文 • 上一篇    下一篇

钾长石矿热分解过程的研究

邱龙会, 王励生, 金作美   

  1. 四川联合大学应用化学系, 成都, 610065
  • 收稿日期:1997-04-14 出版日期:1998-03-24 发布日期:1998-03-24
  • 通讯作者: 邱龙会,男,27岁,博士研究生.
  • 作者简介:邱龙会,男,27岁,博士研究生.
  • 基金资助:

    国家自然科学基金(批准号;29777018)资助课题.

Studies on the Thermal Dissociative Process of Microcline

QIU Long-Hui, WANG Li-Sheng, JIN Zuo-Mei   

  1. Applied Chemistry Department, Sichuan Union University, Chengdu, 610065
  • Received:1997-04-14 Online:1998-03-24 Published:1998-03-24

摘要: 研究了钾长石矿热分解过程的反应行为和动力学.对6种钾长石体系进行了热力学分析,计算了各反应在800~1600K的△GT0,并以此指导实验.研究了焙烧温度、停留时间和助剂配比对钾长石体系热分解为水溶性钾的影响,得出最佳操作条件.添加0.9%添加剂Ⅰ能使适宜焙烧温度由1323K降至1223K,钾分解率可达84%.不加与加入添加剂Ⅰ的2种钾长石体系热分解过程皆符合克-金-布动力学方程,均受固膜扩散控制,表观活化能分别为184.84kJ/mol和158.9kJ/mol,并给出相应的动力学方程.

关键词: 钾长石, 热分解, 热力学, 动力学

Abstract: The microcline CaSO4-CaO system was determined to be used to obtain K2SO4 by thermodynamical analysing and computing lots of possible reactions of 6 microcline systems. The effects of roasting temperature, time and ratios of reactants on the potassium recovery of the microcline CaSO4-CaCO3 were studied and the favorable conditions were determined as follow: 1323 K, 3.0 h, m (microcline)∶ m (CaSO4·2H2O)∶ m (CaCO3)=1∶1∶3. In the presence of 0.9% additive I, the roasting temperature decreased from 1323 Kto 1223 Kand the potassium recovery was 84%. Kinetic experimental data of the two systems with or without additive I both fitted a diffusion-through-product-layer-reaction-controlmodel, and their kinetic equations were presented with apparent activation energies 184.4 kJ·mol-1 and 158.9 kJ·mol-1 respectively.

Key words: Microcline, Thermal dissociation, Thermodynamics, Kinetics

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