【摘要】 以草酸钠、D401螯合树脂为除杂材料，采用化学沉淀-离子交换工艺去除粗制磷酸锂溶液中的钙、镁杂质。结果表明，在草酸钠使用量为理论用量的17.6倍、pH值6.5、反应温度25℃、搅拌速率300 r/min、反应时间60 min、过滤后锂溶液以8 BV/h的流速通过树脂柱条件下，钙、镁杂质去除率分别达到98.21%、83.36%,锂损失率为5.34%;除杂后的锂溶液经再结晶并纯化后，得到形貌规整、分散均匀、纯度大于99.5%的磷酸锂粉体。更多还原

【Abstract】 With sodium oxalate and D401 chelating resin as impurity removal materials, impurities of calcium and magnesium in crude lithium solution were removed by adopting a process consisting of chemical precipitation and ion exchange. In an experiment, reaction was firstly run at 25 ℃ for 60 min by adding sodium oxalate at an amount of 17.6 times the theoretical value, with pH of 6.5 and stirring rate of 300 r/min. And then, the lithium solution after filtration flowed through a resin column at a rate of 8 BV/h. As a result, the removal rates of calcium and magnesium reached 98.21% and 83.36%, respectively, and the lithium loss rate was 5.34%. The purified lithium solution was then recrystallized and purified, and the obtained lithium phosphate powder, with regular morphology and uniform dispersion, has its purity higher than 99.5%.更多还原