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ID:33662181
大小:2.62 MB
页数:67页
时间:2019-02-28
《氟硫矿化剂对高clt3gts水泥熟料形成的影响》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、摘要本论文从研究利用氟硫矿化剂改善水泥生料易烧性入手,运用金相显微镜、x射线衍射、差热分析、高温显微镜、环境扫描电镜和能谱仪等测试手段,对氟硫在高C3S水泥熟料形成中的作用和对C3S结晶的影响进行了研究。研究表明,氟硫复合矿化剂对易烧性的改善效果十分明显,而氟化钙只在煅烧温度较低下效果良好,磷石膏作用不明显,而且熟料中的阿利特会受到中间过渡相分解而成的液相的熔蚀。矿化剂的加入能够促进碳酸盐分解,尤其是氟硫复合矿化剂能显著降低碳酸盐分解高峰44℃之多。矿化剂还可以改变液相性质,如降低液相出现温度,增加液相量,降低
2、液相粘度等,从而为C。S的生成创造良好条件。掺加氟硫复合矿化剂后液相开始出现温度比空白生料样提前140。C,液相大量出现的温度也提前。形成的中间过渡相如3C3S·CaF2在1178。C分解生成C3S具有晶核作用,从而使其晶体的生长提前。而3c2S-3CaS04"CaF2在1200。C~1300"C之间熔融产生液相,促进C3S的形成,能够使熟料在1300。C烧成。氟主要固溶在阿利特中,贝利特中次之,中间相中最低。高温下的挥发和硅酸盐相中的固溶,使得剩余的氟太少以至无法形成氟铝酸钙。氟硫的固溶不会改变阿利特晶型,主
3、要影响是形成固溶体。关键词高C3S水泥熟料;氟硫;矿化剂;氟铝酸钙北京工业大学工学硕士学位论文AbstractThispaperemphasizesonthestudyoftheusingoffluorideandsulphatemineraliserstoimprovethebumabilityofhighC3Scementrawmeal.MM,XRD,DTA,HTM,SEMandEDAXareusedtostudytheroleoffluorideandsulphateinhi曲C3Scementclink
4、erformationandtheeffectonC3Scrystallization.Theresultsshowthatfluoride—sulphatecompositeminerafiserimprovestheburnabilityobviously,andCaF2helpsburningonlyinlowertemperatureandphosphogysumshowsnoevidenteffectontheformationofclinkerinwhichaliteiserodedbyliquid
5、phasedecompoundedbytheintermediatecompound.AddingofmineralisersCan_acceleratecarbonatedecomposition,,and-especiallywhenfluoride—sulphatecompositemineraliseradded,44*(2isreducedfortheheightpeaktemperatureofcarbonatedecomposition.MineralisersCanchangetheproper
6、tyofliquidphase,suchthefallofliquidphaseappearance,theincreaseofliquidphaseamount,reductionofliquidphaseviscosity,andSOon,whichcreatesgoodconditionforCsSformation.Whenfluoride—sulphatecompositemineraliserisadded,thetemperatureofliquidphaseappearanceis140*Cea
7、rlierthanblankrawmeal,andthetemperatureofmassliquidphaseappearancealsobecomesearlier.ThedecompositionofintermediatecompoundcausesC3Sformation,whichhastheeffectofcrystalnucleusandmakesitsgrowthearly.Theeffectof3C2S‘3CaS04’CaF2isgreatlyobvious,whosefusinggener
8、atesliquidphase,promotesC3Sformation,andmakeclinkerburnedatabout1300℃.Fluoridemainlydissolvesinthealite,secondlyinbelite,andtheleastintheinterstitialphase.Volatilizationathightemperatureandsolid
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