反浮选法生产过程中氯化钠对钾收率的影响

Effect of sodium chloride content on recovery rate of potassium in process of reverse floatation-cold crystallization

反浮选-冷结晶法制取氯化钾是世界上较为先进的一种新工艺。运用相图知识对反浮选-冷结晶法生产氯化钾的过程从两个方面进行了较为详细的分析,并通过计算得出不同含量的氯化钠与氯化钾收率变化关系,其结果是随着光卤石矿中氯化钠含量的增高,氯化钾回收率呈线性减少的关系;盐田滩晒的光卤石矿,用反浮选-冷结晶法制取氯化钾的收率一般在50%左右,因此,控制盐田滩晒光卤石矿中氯化钠含量,可提高氯化钾收率,还可节约大量用水,以便在生产过程中对提高氯化钾的产量及质量起指导作用。

Method of reverse floatation-cold crystallization for preparation of potassium chloride is a relatively advanced technology.A detailed analysis on the production of potassium chloride by reverse floatation-cold crystallization process was made by using the phase diagram knowledge,from two aspects and the relationship of recovery rate of potassium chloride with the contents of sodium chloride was worked out.Results showed that with the increase of sodium chloride content in carnallite the recovery rate of potassium chloride will be decreased linearly;the recovery rate of potassium chloride which extracted from carnallite mine in the saltpan using the reverse-floatation cold crystallization method was generally about 50%.Therefore,the recovery rate of potassium chloride can be increased by controlling the sodium chloride content of carnallite mine in the saltpan,and furthermore,a mass of water can be saved.The study can be a guide for increasing the output and quality of potassium chloride during the production.