Lithium demand has risen significantly with the dominance of lithium-ion batteries in renewable energy technology. Spodumene is a primary lithium-bearing mineral of lithium extraction interest, due to its comparatively high grade and simple composition. However, lithium extraction processes from spodumene remain complex. In this study, phosphoric acid was investigated as a lithium leaching agent. Preliminary leach experiments were performed on 1 g of pure β-spodumene, with varying phosphoric acid concentration, temperature, residence time, and liquid-to-solid ratio. Chemical composition of the leach filtrates and residues by inductively coupled plasma optical emission spectroscopy (ICP-OES) revealed that > 40 % lithium leaching efficiency was achieved at an 8 M acid concentration, 100 °C, an 8 h residence time, and a liquid-to-solid ratio of 10 mL/g. With further optimization and understanding of the leaching mechanism, phosphoric acid could prove to be a suitable alternative for selective lithium extraction from spodumene.

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锂辉石磷酸浸出提锂初步研究

随着锂离子电池在可再生能源技术中占据主导地位，锂需求大幅增长。锂辉石由于品位相对较高且成分简单，是一种具有提取锂价值的主要含锂矿物。然而，从锂辉石中提取锂的过程仍然很复杂。在本研究中，研究了磷酸作为锂浸出剂。对 1 g 纯 β-锂辉石进行了初步浸出实验，采用不同的磷酸浓度、温度、停留时间和液固比。通过电感耦合等离子体发射光谱 (ICP-OES) 分析浸出滤液和残留物的化学成分表明，在 8 M 酸浓度、100 °C、8 小时停留时间和液体条件下，锂浸出效率达到 > 40%与固体的比例为 10 mL/g。随着对浸出机理的进一步优化和了解，磷酸可能被证明是从锂辉石中选择性提取锂的合适替代方案。