沸石基地聚合物固化核素sr2的性能及机制分析

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1、电引力和电荷中和能力较弱，其终凝时间比直接添加锂进行固化的体系更长。关键词：4A沸石地聚合物模拟核素總固化机制ABSTRACTThevigorousdevelopmentofNuclearpowerhasproducedasignificantamountoflowandmediumradioactivewasteliquid.Disposingthenuclearwastesafelyandeffectivelyhasbecomethekeyfactorrestrictingthedevelopmentofnuclearen

2、ergy.Thispaperputforwardanewtechnologythatrealizetheadsorption-solidifiedintegrationoflowandintermediatelevelradioactiveliquidwaste.The4Azeoliteloadedstrontiumafteradsorptionwaspreparedintogeopolymerinsuittorealizethecuringofstrontium,shortentheprocessflowandprocess

3、ingtime,reducethesolidifiedbodythantheircapacities.Contrastexperimentwasusedtostudythecuringperformanceoftraditionalcementsolidifiedbodyandgeopolymersolidifiedundernewtechnology.ForthehysteresiseffectbroughtbytheadditionofSr2+,preliminaryexperimentswerecarriedoutbyt

4、hemeasurementofresistivityandfinalsettingtime.Researchshowsthatoptimalparametersforthepreparationthezeolite-basedgeopolymerwere:themodulusofsodiumsilicatebetween0.8and01.5,theactivatorratio2:3and5:6,wh订ethemetakaolinadmixture20%〜80%.Theadsorptiomechanismof4Azeolitef

5、orSlwasionexchange.Amongthezeolite-basedgeopolymer,metakaolin-basedgeopolymer,zeolite-basedcemen—andcement,theoverallperformanceofzeolite-basedgeopolymerwasbestincuringSr2+asfollowingreasons:Ithashighcompressivestrengthwithoutincreasingitsvolume.lthasalmostthelowest

6、leachingrateandcumulativeleachingfractioninfourdifferentleachingagent,whicharedeionizedwater,sulfuricacid,Aceticacidsodiumacetatebuffer,Magnesiumsulfate.Itshightemperatureresistantperformanceisbest,andlostminimumstrengthafterfreezing-thawingcirculation.TheXRDJRandXP

7、SanalysisshowedthattheSr2^tookpartlyplaceofNa十oftherawmaterials,andSrwasalsophysicallysealedbygeopolymergelandthatsimulatednuclidestrontiummaybecuredthroughgoingintothethree-dimensionalnetworkstructureaschemicalbonds•Inthereactionofgeopolymerization,theadditionofstr

8、ontiumcausedthehysteresiseffectandwecanpredictfinalsettingtimebymeasuringresistivity.Highercontentofstrontium(3.58%)hadshorterfinalsetting