氯化钙熔浸钾长石提钾过程的研究  

Study on the Extracting Potassium from Potash Feldspar Ores with Calcium Chloride

作　　者：彭清静[1] 彭良斌[1] 邹晓勇[1] 黄诚[1] 

机构地区：[1]吉首大学化工研究所,湖南吉首416000

出　　处：《高校化学工程学报》2003年第2期185-189,共5页Journal of Chemical Engineering of Chinese Universities

摘　　要：对熔融氯化钙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:反应温度为870～960℃;氯化钙与钾长石的配比(质量比)为1;钾长石的粒径小于0.208mm.动力学分析显示,过程由Ca2+ 在钾长石内部的离子扩散所控制,其扩散系数与反应温度之间的关系与Arrhenius公式具有相同的形式,即Deff = D0exp(-Ea / RT).其中,Ea = 126.938kJ·mol-1,D0 = 21.802mm2·h-1.Extracting potassium from soluble sylvite mine is currently the main source of potassium. But soluble sylvite mine distributes mainly in a few countries. However, potash feldspar is found in many parts of the world. Therefore, it is very significant to study extracting potassium from potash feldspar. The studied extracting process was following, the calcium chloride was used as leaching agent, and melted under high temperature, then made potash feldspar be leached so as to extract potassium. Experiment results showed that the best reaction conditions were the reaction temperature of 870-960°C, size of potash feldspar ores below 0.208 mm, and the mass ratio of calcium chloride to potash feldspar ores being 1. The kinetic study showed that the leaching process was controlled by the internal ionic diffusion of Ca2+ in potash feldspar. The relations between diffusion coefficient and reaction temperature was expressed by the Arrhenius formula: Deff=D0exp(-Ea/RT). In this formula, Ea=126.94 kJ&middotmol-1, D0=21.80 mm2&middoth-1. The leaching rate of potassium can be over 65% under the best reaction condition mentioned above and the feldspar ore can be utilized sufficiently.

关 键 词：钾长石 提钾 氯化钙 动力学 溶盐浸取 

分 类 号：TQ443.5[化学工程—化学肥料工业] TQ013.2