萃取法回收电镀废水中的Cr_梁儒
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2020-01-02 22:20:07
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萃取法回收电镀废水中的Cr(Ⅵ)梁儒,刘国光,吕文英,孙斌(广东工业大学环境科学与工程学院,广东广州510006)[摘要]用四丁基氯化铵(TBAC)对Cr(Ⅵ)进行萃取,考察了稀释剂、水相pH、萃取剂浓度、水相体积、萃取振荡时间等因素对萃取效果的影响,得到最佳萃取条件,确定了萃取物中TBAC与Cr(Ⅵ)的物质的量比为1∶2。用5mol/L的氢氧化钠溶液对负载Cr(Ⅵ)的有机相进行反萃取,反萃取率达97%,浓缩结晶后以重铬酸钠的形式回收利用。[关键词]Cr(Ⅵ);四丁基氯化铵;电镀废水[中图分类号]X703[文献标识码]A[文章编号]1005-829X(2011)09-0019-03Recoveryofchromium(Ⅵ)fromelectroplatingwastewaterbysolventextractionLiangRu,LiuGuoguang,LüWenying,SunBin(FacultyofEnvironmentalScienceandEngineering,GuangdongUniversityofTechnology,Guanzhou510006,China)Abstract:Tetrabutylammoniumchlorine(TBAC)hasbeenusedforextractingCr(Ⅵ).Theeffectsoffactors,suchasdiluent,aqueousphasepH,extractingagentconcentration,aqueousphasevolume,durationofextractionoscilla-tion,etc.ontheextractionresultsareinvestigated.Theoptimumextractionconditionsareobtained.ThemoleratioofTBACtotheextractedchromium(Ⅵ)intheextractanthasbeenfoundtobe1to2.Theorganicphaseofchromium(Ⅵ)loadedisstrippedasCrO42-byusing5mol/LNaOHsolution.Therateofback-extractionis97%.Afteritisconcentratedandcrystal
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