LiCl·2Al(OH)3·nH2O/PVDF杂化膜的制备 及提锂性能
作者:程鹏高,李园园,龚经款,唐 娜,项 军
单位: 天津科技大学 化工与材料学院,天津 300457
关键词: LiCl·2Al(OH)3·nH2O;聚偏氟乙烯;杂化膜;提锂
出版年,卷(期):页码: 2021,41(1):73-79

摘要:
以氯化锂、氯化铝为原料,采用“一步法”制备LiCl·2Al(OH)3·nH2O型铝基锂吸附剂。将LiCl·2Al(OH)3·nH2O与聚偏氟乙烯(PVDF)混合采用相转化法成功制备了具有锂吸附性能的杂化膜。探究了吸附剂负载量、膜厚对杂化膜特性以及吸附性能的影响,并探究了杂化膜的循环使用性能。实验结果表明:当LiCl·2Al(OH)3·nH2O含量12 wt%时,膜孔中出现团聚现象,同时吸附剂的增多提升了杂化膜的亲水性,加强了水膜阻力,使杂化膜通量降低;当杂化膜组成为16 wt% PVDF-10 wt% LiCl·2Al(OH)3·nH2O时,杂化膜在动态循环吸附2 h后,吸附容量基本达到饱和,吸附容量达291 mg/m2,当脱附时长为120 min时,溶液中锂脱附量达最大吸附量的92.8%;同时,增加刮膜厚度有利于提高铝基锂吸附剂杂化膜吸附/脱附容量;铝基锂吸附剂杂化膜10次连续吸附解吸后,其吸附容量仍能保持第一次的85.3%,说明制备的杂化膜有一定的循环耐用性。
 Aluminum-based lithium adsorbent (LiCl·2Al(OH)3·nH2O) was synthesized with LiCl and AlCl3 by one-step method. The hybrid membrane with lithium adsorption property was successfully prepared by the phase conversion method of LiCl·2Al (OH)3·nH2O and PVDF. The effects of the loading amount of the adsorbent and membrane thickness on the characteristics and the adsorption performance of the hybrid membrane were investigated. The results show that when the content of LiCl·2Al(OH)3·nH2O is 12wt%, there is agglomeration in the membrane pore structure, and the increase of adsorbents improves the hydrophilicity of hybrid membrane, strengthens the resistance of water membrane, and reduces the flux of hybrid membrane; When the composition of hybrid membrane is 16wt% pvdf-10wt% LiCl·2Al(OH)3·nH2O, the adsorption capacity of hybrid membrane basically reaches saturation after dynamic cycle adsorption for 2h, and the adsorption capacity is basically saturated when the desorption time is 120 min, reaching 92.8% of the maximum adsorption capacity; Increasing the thickness of the scraped membrane is conducive to improving the adsorption/desorption capacity; Hybrid membrane, after 10 consecutive adsorption/desorption, the adsorption capacity can still maintain 85.3% of the first time, indicating that it has certain cycle durability.
程鹏高(1982-),男,湖北咸宁人,工程师,工学硕士,从事水处理技术与应用,分离膜的制备与应用。

参考文献:
[1] 李杰.铝盐锂吸附剂制备工艺及吸附性能研究[D].成都:成都理工大学,2011.
[2] Jeon Woong An,Dong Jun Kang,Khuyen Thi Tran,et al.Recovery of lithium from Uyuni salar brine[J].Hydrometallurgy,2012,117:64-70.
[3] 陈延成,钱作华,李博昀.中瑞合作利用“许氏法”开发盐湖卤水中锂资源[J].化工矿产地质,1998,1:49-54.
[4] Yanhong Li,Zhongwei Zhao,Xuheng Liu,et al.Extraction of lithium from salt lake brine by aluminum-based alloys [J].Transactions of Nonferrous Metals Society of China,2015,25(10):3484-3489.
[5] 何争珍.氢氧化铝沉淀法提锂工艺研究[D].成都:成都理工大学,2012.
[6] 李建康,刘喜方,王登红.中国锂矿成矿规律概要[J].地质学报,2014,88(12): 2269-2283.
[7] 任世中,曾英,李陇岗,彭时利.盐湖卤水提锂方法研究进展[J].广州化工,2013,41(1):35-37.
[8] 高峰,郑绵平,乜贞,等.盐湖卤水锂资源及其开发进展[J].地球学报,2011,32(4):483-492.
[9] 王卫东,曹茜.国内盐湖卤水提取碳酸锂生产工艺及现状[J].盐湖研究,2010,18(4):52-61.
[10] 彭正顺,严玉顺,姜长印,等.盐湖卤水提锂的研究进展[J].化学通报,1997(12):11-13.
[11] Symons E A.Lithium isotope separation:A Review of Possible Techniques [J].SeparationScience and Technology,1985,20(9):633-651.
[12] Tsuruta T.Removal and recovery of lithium using various microorganisms [J].Journal of Bioscience and Bioengineering,2005,100(5):562-566.
[13] 陈小绵.提锂杂化膜制备及提锂性能研究[D].天津:天津大学,2013.
[14] Umeno A,Miyai Y,Takagi N,et al.Preparation and adsorptive properties of membrane-type adsorbents for lithium recovery from seawater[J].Industry& Engineering Chemistry Research,2002,41(17):4281-4287.
[15] Chung K S,Lee J C,Kim W K,et al.Inorganic adsorbent containing polymeric membrane reservoir for the recovery of lithium from seawater[J].Journal of Membrane Science,2008,325(2):503-508.
[16] 王俊.PAN基锂离子筛膜的制备及在盐湖卤水应用性能研究[D].石河子:石河子大学,2016.

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