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1、ThecrectionmethodsfthelossonignitioninslagcementWangruihai1,Wangwei,YanweizhiChinesebuildingmaterialscertificationcrectionsulfurtrioxidesulfide;iodometry1Crespondingauth:wrh@ctc.Tel8601051167407Fax8601065471658tocrectthe
2、increaseofqualityduetooxidationofsulfidesusuallypresentinsuchcement.ItgivesessentiallythesameresultasthecrectionbasedontheincreaseinSO3contentduringignition.(2)DeterminationWeighto00001g100gofcementintoaplatinumcruciblet
3、hathasbeenpreviouslyignitedtared.Placethecoveredcrucibleintheelectricfurnacecontrolledat(95025)CAllowthecrucibletocooltoroomtemperatureinthedesiccat.Determinetheconstantmasswithoutanexaminationconstant.Thesampleafterigni
4、tiontransfertothe100mlbottlecarefully.Crushthesamplewiththeflattenedendofaglassstirringrod.Determinethesulfidesulfurcontent(Sf)ofthesampleigniteddeterminethesulfidesulfurcontent(Si)oftheiginalcementsamplebyiodometry.Accd
5、ingtotheactualdeterminationofthelossonignitionthechangeofsulfidesulfurcontentbefeafterignitioncrectcalculation:Thesulfidesulfurcontentisdeterminedbyiodometry:Thecementisdecomposedbyhydrochlicacidunderreducingconditions.T
6、hesulfidesaretransfmedintohydrogensulfidewhichiscarriedoverbyagaseousstreamintoanammoniacalsolutionofzincsulfate.Theamountofprecipitatedzincsulfideisdeterminedbyiodometry.1blowingairpump2rotameter3washingcylinder250mL100
7、mlinsidecoppersulfatesolution(50gL)4pingfunnel20mL5reactionflask100mL6electricfurnace600w1kva~2kvaregulatingtransfmerconnected7beaker400mlinside20mLammoniumzincsulfatesolution300mLwater.FigureTypicalapparatusfthedetermin
8、ationofsulfideThedeterminationofsulfidesulfuranalysissteps:Place20mLoftheammoniacalzincsulfatesolution(100gL)300mLwaterinabeaker.Accdingtotheinstrumentinstallationdrawingglassairwayintothebeaker.Weighto00001g100gofcement
9、.Placeina100mlstopperedroundbottomflaskwithagroundglassjoint.Addabout20goftin(II)chlide10mLwater.Gentlyshaketoscatterthesamplecompletelyaccdingtotheinstrumentinstallationdrawingconnectionpartsimmediately.Release20mlhydro
10、chlicacid(11)fromthepingfunneltotheflaskquicklyclosethepistons.Switchontheairpumpadjusttheflowtoabout100mlminto150mlmin(4~5bubblespersecond).Heatthecontentsoftheflasktoboilingboilf4minto5min.Cutofftheheatcontinuethepassa
11、geofairf4min~5min.Closeairpump.Disconnectthedeliverytubeleaveitinthesolutionfuseasastirrer.Add10mLgelatinsolution(5gL)5.00mLpotassiumiodate(0.03molL)add40mlhydrochlicacid(11)underthefullstirring.Titratewithsodiumthiosulf
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