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›› 2002, Vol. 2 ›› Issue (2): 0-0.

• 2 •    

氯化钠熔浸钾长石提钾过程

彭清静，邹晓勇，黄诚   

  1. 吉首大学化工研究所, 湖南 吉首 416000
  • 出版日期:2002-04-20 发布日期:2002-04-20

Preparation of Monodisperse Silica Ultramicrons

WANG Ling-lingl，FANG Xiao-longl，TANG Fang-qiong2，YANG Chuan-fangl， LIU Hui-Zhoul   

  1. Research Institute of Chemical Engineering , Jishou University, Jishou, Hunan 416000, China
  • Online:2002-04-20 Published:2002-04-20

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摘要： 对熔融氯化钠浸取钾长石的提钾过程进行了研究. 结果显示，最佳反应条件是：反应温度890~950℃；氯化钠与钾长石的质量配比为1；钾长石的粒径为0.208 mm以下. 动力学分析显示，过程由Na+和K+在钾长石内部的离子扩散控制，扩散系数与反应温度之间的关系服从Arrhenius公式，即Deff=D0exp(–Ea/RT)，其中，Ea=81.42 kJ/mol，D0=0.324 mm2/h.

关键词: 钾长石, 提钾, 氯化钠, 动力学, 熔盐浸取

Abstract: The main factors that affect the leaching rate of potassium in potash feldspar were studied. It is shown that the best reaction conditions are reaction temperature of 890~950oC, size of potash feldspar ores below 0.208 mm, and the weight ratio of sodium chloride to potash feldspar ores being 1. The study showed that the leaching process is controlled by the internal ionic diffusion of Na+ and K+ in potash feldspar. The relations between diffusion coefficient and reaction temperature is expressed by the Arrhenius formula: Deff=D0exp(-–Ea/RT), with Ea = 81.42 kJ/mol, D0=0.324 mm2/h.

Key words: silica, reverse micelles, ultramicron, TEOS(tetraethylorthosilicate), Stober method, monodisperseparticles

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