焚烧飞灰中重金属的浸出特性及水泥固化的实验研究

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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．