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ID:36632459
大小:1.43 MB
页数:54页
时间:2019-05-13
《焚烧飞灰中重金属的浸出特性及水泥固化的实验研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、西南交通大学硕士学位论文焚烧飞灰中重金属的浸出特性及水泥固化的实验研究姓名:徐黎黎申请学位级别:硕士专业:环境工程指导教师:刘丹20070501西南交通大学硕士研究生学位论文第1I页AbstractThepropertyofflyashinamedicalwasteincinerationandsolidificationeffectofcementarestudiedinthispaper.Leachingcharacteristicsofallofparticlesizeofheavymetalanddifferentpart
2、iclesizeofheavymetalarcstudied.Andinfluenceofheavymetalleachingisstudiedatdifferentfactorssuchasleachingtime,L/Sratio,pHvalueandadditives.Theresultsshowsthatthecontentofheavymetalsinflyashcanincreasewithdecreaseoftheparticlesize,butsmallsizeparticles(<100pm、accountfor
3、littleamongtotalamountofflyashsothecontentofheavymetalsinflyashisrelativelylow.Heavymetalsintheflyashareveryeasytoleachinacidcondition,whilehardlyleachinalkalinecondition.Solidificationcharacteristicsofflyasharestudiedbyusingcement425assolidificationafters01idificatiO
4、neffectofcement325andcement425iscompared.Influenceofheavymetalsleachingisanalyzedindifferentmixedproportionsofflyashandcementandsolidifiedtimesothatappropriateparameteronsolidificationofflyashwithcementisdetermined.Theresultsshowthatleachingratioofheavymetalscanincrea
5、sewithincreaseofthecontentofflyashandcanreducewiththeincreaseofsolidifiedtime.50%cementratioinmixedproportionsshouldbeappropriatebecauseofsolidificationeffectandleachingcharacteristicsofheavymetal.ItisconsideredthatadditivessuchasNaOH、Na2Sandsoonareaddedinthemixtureso
6、fflyashandcementbecauseleachingratioofheavymetalssuchasZn、PbandCdinflyashandsolidifiedproductsismuchmorethantheotherheavymetals.Stabilizationeffectintheadditivesofsameaddingamountandinfluenceofheavymetalsleachingindifferentaddingamountofseveralkindsofadditivesaftersol
7、idificationofflyashwithcementareresearched.TheresultsshowthatthebeststabilizationeffectofheavymetalsinsolidifiedproductsisNa2Sandleachingratioofheavymetalsislowerthan4%.Leachingconsistence西南交通大学硕士研究生学位论文第1Il页ofheavymetalsinsolidifiedproductscanreducewiththeincreaseofa
8、ddingamount.Theaddingamountoftheadditiveshouldbeappropriate,generallyaboat5%becauseofstabilizationeffectandeconomicbanefjts.
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