摘要
以西藏高原结则茶卡湖水为研究对象,探索了不同温度下卤水冷冻析盐规律.实验结果表明,随冷冻温度的降低液相中不同离子的浓度变化不同:低密度卤水中除24SO-外的离子都被富集;而高密度卤水冷冻后24SO-、23CO-、B2O3浓度降低明显.密度低于1.228,g/cm3的卤水冷冻后,芒硝(Na2SO4·10H2O)析出,但泡碱(Na2CO3·10H2O)没有析出;密度高于1.228,g/cm3的卤水冷冻后芒硝、泡碱都析出.因此,可以用冷冻方法使芒硝、泡碱分开析出获取富锂卤水,即选取密度在1.228,g/cm3左右的卤水冷冻去除芒硝,去除芒硝后卤水进一步浓缩,再次冷冻后去除泡碱,则余卤可以作为提锂原料.冷冻实验结果对碳酸盐型盐湖卤水浓缩过程控制具有一定的参考价值.
The aim of this research is to find out the salt forming law of brine from Jezechaka Salt Lake in Tibet by a freez- ing process at different temperatures. The experimental results show that with the descent of freezing temperature, the con- centration of different ions changed differently in the liquid phase. All the ions were enriched except SO4^2- in low-density brine, while the concentrations of SO4^2- , CO3^2-, B2O3 decreased significantly in high-density brine. After the brine was fro- zen with the density lower than 1.228 g/cm^3, mirabilite（Na2SO4·10H2O）was precipitated obviously without na- tron （Na2CO3· 10H2O）, but mirabilite and natron were precipitated when the density was higher than 1.228 g/cm3 under the same condition. Therefore, the method to precipitate mirabilite and natron step by step through freezing can be used to obtain lithium-rich brine. When the density was about 1.228 g/cm^3, the brine was frozen to eliminate mirabilite. After that, the sepa- rated liquid was further concentrated, which can be used to get rid of natron by the refreezing process. The residual brine could be raw material for extracting lithium. The freezing experimental results have some reference for the concentration process of carbonate-type salt lake brine.
出处
《天津科技大学学报》
CAS
北大核心
2015年第5期37-41,77,共6页
Journal of Tianjin University of Science & Technology
关键词
卤水
冷冻
液相组成
结则茶卡
brine
freeze
liquid phase composition
Jiezechaka
