利用钾混盐制备光卤石的研究

Study on preparation of carnallite from mixed potassium salt

通过对Na+、K+、Mg2+//Cl-、SO42--H2O五元体系相图理论和数据的分析,提出了一种处理软钾镁矾和钾盐镁矾这2种钾复盐的新方法。在高温条件下(100℃)对软钾镁矾和钾盐镁矾进行转化,在低温条件下(15℃)析出光卤石,光卤石再分解可以生产氯化钾。在高温转化和低温冷却分别为75℃和25℃的条件下,结合查波错盐湖(硫酸钠亚型)秋季卤水钾混盐进行实验研究。结果表明,整个转化过程中钾的转化率可达80%左右,该工艺的可行性得到证实。

After the analysis about the theory and data of Na^＋, K^＋, Mg^2＋//Cl^, SO42^--H2O quinary system phase diagram, a new method to deal with picromerite and kainite,the two potassium double salts was put forward.Picromerite and kainite were treated under high temperature condition （100 ℃ ）, then earnallite can be separated out by cooling under low temperature（15 ℃ ）, and by the way of decomposing, potassium chloride can be obtained from carnallite.Under 75 ℃ of high temperature transformation and 25 ℃ of low temperature cooling, the mixed potassium salt in autumn brine from Chabocuo salt lake （sodium sulfate subtype） was studied.Results showed that the potassium conversion rate of the whole transformation process can reach about 80%, which proves the feasibility of the process route.