研究了吸附法从盐湖卤水中提取锂的工艺过程，不单独制备吸附剂，并用氢氧化钙代替传统的氢氧化钠作沉淀剂。研究了铝锂摩尔比、氢氧化钙加入量、反应时间等因素对锂吸附效果的影响，并用X射线衍射（XRD）、原子吸收光谱法（AAS）对各样品进行了表征。实验结果表明：所得沉淀产物为LiCl·2Al （OH）₃·xH₂O，铝锂摩尔比、氢氧化钙加入量、反应时间对锂吸附效果影响显著。在室温下，铝锂摩尔比为4，氢氧化钙加入量为9 g，反应时间为2 h时，锂吸附效果较佳，锂吸附率可达96.4%。吸附产物经脱附，镁锂分离情况较理想。

Lithium extraction from salt lake brine via adsorption process is studied.The formation of aluminum-containing adsorbent and the adsorption of lithium are carried out simultaneously,and calcium hydroxide is used as the precipitant instead of sodium hydroxide in traditional method.The effects of mole ratio of Al to Li,the dosage quantity of calcium hydroxide and reaction time on the adsorption rate of lithium are investigated.Then the prepared samples are characterized by X-ray diffraction analysis and atomic absorption spectroscopy.The results show that the precipitated product obtained is LiCl·2Al(OH)₃·xH₂O,and the Al/Li mole ratio,dosage of calcium hydroxide and reaction time have great influences on lithium extraction efficiency.Optimal extraction conditions in this system include mole ratio of Al/Li at 4,dosage of calcium hydroxide at 9 g,and reaction time of 2 hours.Under these conditions,the adsorption rate of lithium reaches 96.4%,which is more efficient than the conventional means.

李茹(1992-),女,硕士生,研究方向为化工冶金新技术新工艺开发,lirscu@qq.com