Abstract Shale gas produced water has a large number of inorganic compounds, originating from the shale layer and the fracturing fluid. Especially, the Marcellus shale gas produced water contains a relatively high concentration of lithium, one of the important metals in various industries; as a result, there have been several studies on recovering lithium from the produced water. However, the fluid also includes organic compounds, but their probable inhibitory effect on the recovery of profitable metal has not been thoroughly examined. In this study, solvent extraction was implemented to recover lithium from the produced water, containing different types and concentrations of alkanes in two consecutive stages. The first and second stage involved the removal of the divalent ions in the produced water, as well as the extraction of Li+ ions, respectively. During the extraction process, there was an inhibitory influence of organic compounds, with their effects on the Li recovery efficiency predominantly observed in the first stage vs. the second stage. Final lithium recovery efficiency after two extraction stages decreased with increasing alkane chain length and increasing concentrations of n-hexane.

中文翻译：

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从模拟页岩气采出水中通过溶剂萃取回收锂——有机化合物的影响

摘要 页岩气采出水中含有大量无机化合物，来源于页岩层和压裂液。尤其是马塞勒斯页岩气采出水含有较高浓度的锂，锂是各行业的重要金属之一；因此，有几项关于从采出水中回收锂的研究。然而，该流体还包括有机化合物，但尚未彻底研究它们对有利可图金属回收的可能抑制作用。在这项研究中，实施溶剂萃取以从产出水中回收锂，在两个连续阶段中含有不同类型和浓度的烷烃。第一和第二阶段涉及去除产出水中的二价离子，以及提取 Li+ 离子，分别。在萃取过程中，有机化合物存在抑制作用，它们对锂回收效率的影响主要在第一阶段和第二阶段观察到。两个提取阶段后的最终锂回收效率随着烷烃链长度的增加和正己烷浓度的增加而降低。