中文摘要：

西藏扎布耶盐湖年平均气温-0.4℃,为了更好地了解该卤水在自然条件下的蒸发结晶规律,对冬季卤水-10℃冷冻后0℃等温蒸发实验进行了研究。实验结果表明：在低温0℃蒸发状态下,锂以碳酸锂形式在整个蒸发过程中分散沉淀,固相最高质量分数仅达0.094%,因此难以获得较高品位的富锂混盐;硼在全蒸发过程中都以硼砂形式自然沉淀,固相中硼砂的质量分数最高达到1.89%;钾在蒸发过程中则以氯化钾和钾芒硝析出。液相中K^＋的质量浓度最高达到29.38g/L;B2O3的质量浓度在蒸失率为95.95%时达到最大值18.69g/L,此时液相中硼B2O3的质量浓度为初卤中的16.7倍;液相中Li^＋浓度最大值为4.83g/L。

英文摘要：

The annual average temperature of the Zhabuye salt lake in Tibet is about-0.4℃.In order to better understand the evaporation sequence of the brine under natural conditions,the paper studies the isothermal evaporation of the brine at 0℃.The brine for experiments was taken from the lake in winter,then was frozen at-10℃ in advance and separated out precipitated salts.The experimental results can be used for the salt pond design and the technology of comprehensive utilization of the brine.The isothermal evaporation experimental results show that lithium is scatteredly precipitated as lithium carbonate in the whole evaporation process,and the highest mass fraction of lithium carbonate in solid phase is 0.094%,so it is difficult to get the mixed salt with high-grade lithium carbonate.Boron is precipitated as borax in the whole evaporation process,and borax is precipitated in large quantities with the highest mass fraction of 1.89%in solid phase.Potassium is precipitated as sylvite and glaserite in the whole evaporation process.The maximum potassium ion in the solution is 29.38 g/L,The maximum mass concentration of B2O3 in the solution is 18.69g/L with CWR≥97.9%,and at this time,the B2O3 mass concentration is 16.7 times of the initial brine.The maximum mass concentration of Li^＋in the solution is 4.83g/L.