钾肥生产浮选尾盐钠镁分离试验研究

Research on separation of sodium and magnesium from flotation salt in potassium fertilizer production

某硫酸钾镁肥厂在生产钾镁肥过程中产生大量浮选尾盐,其主要成分是硫酸镁和氯化钠,而且钠含量高镁含量低。针对钾镁肥浮选尾盐高钠低镁的情况,以某硫酸钾厂浮选尾盐为原料,采用分步溶解的方法分离钠而富集镁。经分步溶解,钠的收率(存在于固相中)为47.2%,而镁有98.3%进入液相,经冷却结晶得到镁产品,镁的收率为56%,钠镁得到较好的分离。

A great deal of flotation salt was produced in a potash magnesium sulphate fertilizer manufacturing process, whose basic components were magnesium sulfate and sodium chloride. The content of magnesium was lower and the content of sodium was higher in the flotation salt. Aiming at lower magnesium and higher sodium of the flotation salt in potassium fertilizer production, a method for separation of sodium and enrichment of magnesium was used by means of step dissolution. After step dissolution, the yield of sodium （in solid phase/ was 47.2% ,and 98.3% of magnesium went into liquid phase. Magnesium product could be got by cooling crystallization. Magnesium yield was 56%. So sodium and magnesium were well separated under this condition.