基于三元体系相图对两种钾肥的分离研究  

Study on separation of two kinds of potash fertilizer based on ternary system phase diagram

作　　者：龚力 邱东平 邓翔 姚旭松 GONG Li;QIU Dong-ping;DENG Xiang;YAO Xu-song(Keyuan Engineering Technology Testing Center of Sichuan Province,Chengdu 610091,China;Sichuan Province Key Laboratory of Shale Gas Evaluation and Exploitation,Chengdu 610091,China)

机构地区：[1]四川省科源工程技术测试中心,四川成都610091 [2]页岩气评价与开采四川省重点实验室,四川成都610091

出　　处：《应用化工》2021年第S02期91-93,共3页Applied Chemical Industry

基　　金：四川省科技厅省院省校重大项目(2018JZ0003)。

摘　　要：描述了市面上主要的两种钾肥效果和应用,采用等温溶解平衡法研究了三元体系KCl-K_(2)SO_(4)-H_(2)O在298 K的介稳平衡关系,绘制了相应平衡关系图及物化性质组成图。结果表明,298 K时该三元体系为简单共饱和型,无复盐及固溶体形成,相图中有1个共饱点(E),2条单变曲线,2个平衡固相结晶区分别为氯化钾和硫酸钾;简要阐述了三元体系的密度变化规律;得出结论,氯化钾对硫酸钾有较明显的盐析作用。The application of two kinds of potash fertilizer was compared,the solid-liquid equilibria in ternary system KCl-K_(2)SO_(4)-H_(2)O at 298 K were studied,and the solubilities and densities of solution in the ternary system were determined.Research showed that the ternary system was of simple eutectic type and nodouble salt or solid solution was found;the solubility diagram of the ternary system had one invariant point,two univariant curves,and two fields of crystallization(KCl and K_(2)SO_(4)).The solubilities of KCl-K_(2)SO_(4)-H_(2)O at different temperatures were compared and analyzed.Results showed that potassium bromide had a strong salting-out function on potassium sulfate obviously.The density changing rule of the KCl-K_(2)SO_(4)-H_(2)O was also discussed simply.

关 键 词：钾肥 相图 水盐体系 平衡 

分 类 号：O642.42[理学—物理化学]