一种磷酸铁中硫酸钠盐的去除方法

A Method for Removing Sodium Sulfate from Iron Phosphate

摘要: 在当前阶段，磷酸铁锂材料对新能源电池的重要性显而易见，其成本低、性能稳定、有较好的循环使用性且可控性高，使其成为锂电池正极材料的首选。而磷酸铁是合成磷酸铁锂的重要原料，磷酸铁锂的制备离不开磷酸铁这一前驱体，因此，去除磷酸铁中杂质的工作显得必不可少，本文就提出了一种除去磷酸铁中硫酸钠的方法，该工艺利用磷酸铁和硫酸钠溶解性的差异实现分离，整个过程清洁环保，操作简单，效率较高，且最终得到的磷酸铁有较好的铁磷比。

Abstract: At this stage, the importance of lithium iron phosphate material to new energy battery is obvious. It’s the preferred option to be positive an electrode for lithium batteries for its low cost, stable performance, good recyclability and high controllability. Iron phosphate is the core raw material for the synthesis of lithium iron phosphate, the preparation of lithium iron phosphate is inseparable from the precursor of iron phosphate. Therefore, it is essential to remove impurities in the iron phosphate. A method for removing sodium sulfate from iron phosphate is proposed in this paper, the difference of solubility between ferric phosphate and sodium sulfate is proposed to achieve separation. The whole process is clean, environmentally friendly, with simple operation and high efficiency, and the finally obtained iron phosphate has a better iron to phosphorus ratio.