江陵地下卤水富集锂的变化规律研究

Study on variation law of enriching lithium in Jiangling underground brine

地下卤水、盐湖卤水及矿石中含有丰富的锂资源,锂的提取多从前两者中进行,所以需要对此进行合理的开发利用。主要对湖北江陵地下卤水蒸发浓缩过程中锂离子浓度的变化规律进行研究。首先对江陵地下卤水浓缩过程中的析盐规律和锂离子浓度变化规律分别进行研究。蒸发浓缩江陵地下卤水对其进行常量化学组成分析和锂离子浓度的测定。实验结果表明,氯化钠浓度随着蒸发率的增大先增大再减少,氯化钾浓度随着蒸发率的增大而增大。在蒸发率为34.80%时,氯化钠开始析出;在蒸发率为66.10%时,氯化钾开始析出。锂离子浓度随着蒸发率的增大而增大。确定析钾点并测出母液中各离子含量,继续蒸发母液研究浓缩过程中锂离子浓度的变化规律,为今后从江陵地下卤水中提取锂提供了基础数据。

Underground brine,salt lake brine and ore are rich in lithium resources. Lithium extraction is mainly carried out from the former two,so it needs to be rationally developed and utilized.The variation law of lithium ion concentration in the process of evaporation and concentration of underground brine in Jiangling,Hubei Province was studied.Firstly,the salt-dis- charging law and the variation law of lithium ion concentration in the process of Jiangling underground brine concentration were studied separately.Constant chemical composition analysis and lithium ion concentration determination of Jiangling underground brine by evaporation and concentration were carried out.The experimental results showed that the concentration of sodium chloride increased first and then decreased with the increase of evaporation rate,and the concentration of potassium chloride increased with the increase of evaporation rate.Sodium chloride began to precipitate when the evaporation rate was 34.80% and potassium chloride began to precipitate when the evaporation rate was 66.10%.The lithium ion concentration increased as the evaporation rate increased.By determining the potassium precipitation point and measuring the content of each ion in the mother liquor,the change rule of lithium ion concentration during the continuous evaporation of the mother liquor was studied,which provided basic data for extracting lithium from Jiangling underground brine in the future.