乙醇萃取法制备低Na;K高纯氯化锂

基于碱金属氯化物在乙醇中的溶解度差异,首次提出了乙醇萃取法制备低Na,K高纯氯化锂的工艺方法·除Ca实验表明,当草酸锂的加入量为0·6%时,Ca质量分数可控制在10×10-6~15×10-6以下;除Na,K实验表明,当液固比为8·5,过滤次数为2次时,Na质量分数可降到40×10-6以下,K质量分数可降到5×10-6以下·说明乙醇萃取法很好地解决了氯化锂制备中很难深度除去Na,K的技术难题

Preparation of Low Na/K Highly Purified LiCl by Alcohol Extraction

Based on the different of solubilities of alkali metal chlorides in alcohol, the highly purified lithium chloride with low sodium/potassium contents was prepared for the first time by alcohol extraction process. The results showed that calcium content in mass fraction can be controlled lower than (10-15) × 10^-6 after decalcification by adding 0.6% lithium oxalate, meanwhile, the sodium and potassium contents can be lower than 40 × 10^-6 and 5 × 10^-6, respectively, when filtering the solution 2 times and the liquid to solid ratio 8.5. Such a result means that the alcohol extraction is an effective way to remove sodium and potassium in preparing highly purified lithium chloride.