| 摘要: |
| 目的 为绿色高效地回收气田采出水中的锂资源，采用锰系吸附剂开展Li+吸附研究。方法 考查了锰系吸附剂（主要成分为Li1.361 Mn1.639 O4）在气田采出水（ρ（Mg2+）∶ρ（Li+）=2.46）中不同实验条件（固液比、初始质量浓度、温度）下的吸附性能，并通过SEM、XRD、XPS、FT-IR等表征手段研究吸附材料在吸附前后物化性质的变化。结果 经过5次循环吸脱附后，吸附剂吸附容量维持在9.5~10.5 mg/g，锰溶损失率始终小于2%；吸附过程符合准二级动力学模型，吸附速率主要由化学吸附控制；且吸附行为契合Langmuir吸附等温模型，存在一个饱和吸附容量。结论 在气田采出水的锂资源回收中，锰系吸附剂具有极好的应用前景。未来可对吸附材料进行改性以降低其锰溶损率，并通过调控水化学环境进一步提升其吸附容量，以期在气田水中表现出更高的提锂效率。 |
| 关键词: 气田采出水 锂资源回收 吸附 锰氧化物 |
| DOI：10.3969/j.issn.1007-3426.2024.05.012 |
| 分类号: |
| 基金项目:中国石油?西南石油大学创新联合体研究专题“低成本压裂返排液重复利用与无害化处理技术研究”（2020CX020300） |
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| Study on the adsorption performance of manganese-based adsorbent in lithium extraction from produced water in gas fields |
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Xiaofan CHANG1, Jianhua GONG2, Ying XIONG3, Lin HE4, Wenshi LIU1
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1.School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan, China;2.PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan, China;3.Research Institute of Natural Gas Technology, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan, China;4.Sichuan Environment and Engineering Appraisal Center, Chengdu, Sichuan, China
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| Abstract: |
| Objective In this study, manganese-based adsorbents were used to recover lithium resources from the gas field produced water in an environmentally friendly and efficient manner. Methods The study investigated the adsorption performance of a manganese-based lithium adsorbent (mainly composed of Li1.361Mn1.639O4) under various experimental conditions, including solid-liquid ratio, initial concentration, and temperature, in gas field producted water (ρ(Mg2+):ρ(Li+)= 2.46). The physical and chemical properties of the adsorbent material before and after adsorption were analyzed using scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and fourier transform infrared (FTIR) spectrometer. Results After undergoing five adsorption and desorption cycles, the adsorbent maintained an adsorption capacity of 9.5-10.5 mg/g, while the manganese dissolution and loss rate remained below 2%. The adsorption process followed the quasi-secondary kinetic model, with chemical adsorption being the main controlling factor for the adsorption rate. The adsorption behaviours were consistent with the Langmuir adsorption isothermal model, indicating the presence of a saturated adsorption capacity. Conclusions Manganese-based adsorbents show promise for lithium resource recovery in gas field produced water. The adsorbent material could be modified to reduce manganese solubility loss and improve adsorption capacity by introducing buffer ions, so as to improve the lithium extraction efficiency in gas field produced water. |
| Key words: gas field produced water lithium resource recovery adsorption manganese oxide |
