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1、doi:10.3969/j.issn.1007-7545.2017.08.006磁性鋰離子篩的制備及提鋰性能研究李志勇1,李亦然1,張衛(wèi)民1,項(xiàng)軍2,廉歡1,陳程3(1.東華理工大學(xué)水資源與環(huán)境工程學(xué)院,南昌330013;2.天津科技大學(xué)化工與材料學(xué)院,天津300457;3.東華理工大學(xué)地球科學(xué)學(xué)院,南昌330013)摘要:在Stober法的基礎(chǔ)上采用二氧化硅對(duì)Fe3O4包覆鈍化,使鋰錳氧化物在二氧化硅界面生長(zhǎng),陳化、過濾、烘干、煅燒后生成Li1.6Mn1.6O4@SiO2@Fe3O4納米鋰離子
2、篩前驅(qū)體。酸浸抽鋰后得到磁性鋰離子篩。SEM結(jié)合EDX測(cè)試表明,鋰錳尖晶石相對(duì)均勻地包覆在鈍化后的磁核表面,磁性離子篩的平均粒徑為18.6nm。在配制的模擬鹵水中,H1.6Mn1.6O4對(duì)鋰的平衡吸附量是8.78mg/g,本文制備的H1.6Mn1.6O4@SiO2@Fe3O4對(duì)鋰平衡吸附量可達(dá)6.01mg/g,除了Mg2+平衡吸附量達(dá)到5.213mg/g以外,其它離子的吸附量都在1.756mg/g以下,說明材料對(duì)Li+的吸附有較好的選擇性。用磁性鋰離子篩開展反復(fù)吸附、脫附試驗(yàn)10次后,其對(duì)Li+
3、仍有良好的吸附效果,平衡吸附量穩(wěn)定在5.1mg/g,鋰解吸率在95%左右。磁性鋰離子篩的飽和磁化強(qiáng)度為15.14emu/g,矯頑力為63.02G,可在外加磁場(chǎng)作用下實(shí)現(xiàn)與鹵水的磁分離。關(guān)鍵詞:包覆;鈍化;磁性鋰離子篩;吸附;磁分離中圖分類號(hào):TQ131.1文獻(xiàn)標(biāo)志碼:A文章編號(hào):1007-7545(2017)08-0000-00PreparationofMagneticLithiumIon-sieveandItsLithiumUptakingLIZhi-yong1,LIYi-ran1,ZHANG
4、Wei-min1,XIANGJun2,LIANHuan1,CHENCheng3(1.SchoolofWaterResourcesandEnvironmentalEngineering,EastChinaUniversityofTechnology,Nanchang330013,China;2.TianjinUniversityofScienceandTechnology,Tianjin300457,China;3.SchoolofEarthSciences,EastChinaUniversity
5、ofTechnology,Nanchang330013,China)Abstract:Fe3O4waspassivatedbysilicabasedonStobermethod.Lithiummanganeseoxidegrewatsilicainterface.Li1.6Mn1.6O4@SiO2@Fe3O4nanometerlithiumion-sieveprecursorswereproducedafteraging,filtration,drying,andcalcining.SEMand
6、EDXtestsshowthatlithiummanganesespinelisrelativelyuniformlycoatedonsurfaceofpassivatedmagneticcore.Averageparticlesizeofmagneticion-sieveis18.6nm.EquilibriumadsorptioncapacityoflithiumH1.6Mn1.6O4is8.78mg/g,andadsorptioncapacityofH1.6Mn1.6O4@SiO2@Fe3O
7、4preparedforthisresearchis6.01mg/ginsimulatedbrine.InadditiontoMg2+equilibriumadsorptioncapacityof5.213mg/g,adsorptionofotherionsis1.756mg/gbelow,indicatingthatadsorptionofLi+tomaterialhasgoodselectivity.Afterrepeatedexperimentswithmagneticlithiumion
8、sievesfor10times,equilibriumadsorptioncapacityofLi+is5.1mg/gwithdesorptionrateoflithiumofabout95%.Magneticlithiumionsievehasgoodmagneticpropertieswithsaturationmagnetizationof15.14emu/gandcoercivityof63.02G,whichcanbeseparatedfrombrinebymagnetismsepa