Lithium extraction from the mineral zinnwaldite: Part II: Lithium carbonate recovery by direct carbonation of sintered zinnwaldite concentrate
Lithium extraction from the mineral zinnwaldite: Part II: Lithium carbonate recovery by direct carbonation of sintered zinnwaldite concentrate
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DOI：
10.1016/j.mineng.2017.04.009
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发表时间：
2017-08
影响因子：
4.8
通讯作者：
Gunther Martin;A. Schneider;W. Voigt;M. Bertau
中科院分区：
文献类型：
--
作者：
Gunther Martin;A. Schneider;W. Voigt;M. Bertau
基于在第一部分中锌锰矿的分解研究，开发并优化了通过超临界二氧化碳（sc-CO2）处理生产碳酸锂的工艺以获得高锂产率。在升高的压力（100巴）和适度加热（230 °C）下，对烧结和研磨的锌钨石精矿进行CO2/水处理。动员率达到70%以上。通过电渗析将过滤的含碳酸氢锂的溶液浓缩至锂含量为8.5g/L。碳酸锂的沉淀通过在90-95 °C下消除CO2来实现。CO2处理对碱金属（特别是锂）的高选择性使碳酸锂产品纯度≥99.0%而无需额外冲洗。
Based on decomposition studies of zinnwaldite in Part I, a process for lithium carbonate production by supercritical carbon dioxide (sc-CO2) treatment was developed and optimised to high lithium yields. Sintered and ground zinnwaldite concentrate was subjected to CO2/water treatment at elevated pressure (100 bar) and moderate heating (230 °C). Mobilisation rates of over 70% were attained. The filtered lithium bicarbonate containing solution was concentrated by electrodialysis up to a lithium content of 8.5 g/L. Precipitation of lithium carbonate was achieved by CO2elimination at 90–95 °C. A high selectivity of CO2treatment for alkali metals, specifically for lithium, enables lithium carbonate product purities of ≥99.0% without additional rinsing.