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1、第29卷第6期硅酸盐通报Vo.l29No.62010年12月BULLETINOFTHECHINESECERAMICSOCIETYDecember,2010温度制度对尾矿烧结砖性能及结构的影响1112陈永亮,张一敏,陈铁军,赵云良(1.武汉科技大学资源与环境工程学院,武汉430081;2.武汉理工大学资源与环境工程学院,武汉430070)摘要:以鄂西赤铁矿尾矿为主要原料制备烧结砖,研究了升温速率、烧成温度和保温时间对样品的性能、相组成以及显微结构的影响。结果表明:烧成温度和保温时间是影响样品性能和结构的主要因素,升温速率从2e/min到10e/min变化对砖体性能影响不大。XRD和S
2、EM分析表明:新的结晶相A-鳞石英、钙铝黄长石和钙长石在1000e左右开始形成,同尾矿中原有的A-石英和赤铁矿等晶相一起构成烧结砖的矿物骨架,赋予其强度;液相量随着烧成温度的提高不断增多,晶体颗粒被熔融的玻璃质所包裹胶结形成整体,有利于强度的提高和吸水率的降低。最适宜的温度制度为升温速率6e/min左右、烧成温度980~1030e、烧成保温时间2~3h,在此条件下烧制的尾矿烧结砖各项性能均达到5烧结普通砖6(GB/T5101-2003)中MU20的要求。关键词:赤铁矿尾矿;烧结砖;温度制度;性能;显微结构中图分类号:TQ175文献标识码:A文章编号:1001-1625(2010)0
3、6-1343-05EffectofTemperatureSystemonPropertiesandMicrostructureofFiredBricksPreparedwithTailings1112CHENYong-liang,ZHANGYi-min,CHENTie-jun,ZHAOYun-liang(1.SchoolofResourceandEnvironmentalEngineering,WuhanUniversityofScienceandTechnology,Wuhan430081,China;2.SchoolofResourceandEnvironmentalEngin
4、eering,WuhanUniversityofTechnology,Wuhan430070,China)Abstract:FiredbrickswerepreparedwiththehematitetailingsfromwesternHubeiprovinceofChinaasthemainrawmaterials.Theeffectsofheatingrate,firingtemperatureandholdingtimeonproperties,phasecompositionsandmicrostructureoffiredbrickswereinvestigated.T
5、heresultsshowedthatfiringtemperatureandholdingtimewerethemainfactorsthatinfluencingthepropertiesandmicrostructure,whileheatingraterangedfrom2to10e/minwaslittleeffectonthepropertiesofbricks.TheanalysisofphasecompositionsandmicrostructurebyXRDandSEMshowedthatnewcrystallinephasessuchasA-tridymite
6、,gehleniteandanorthiteformedwhenfiredat1000e,togetherwithA-quartzandhematiteexistinginrawmaterialsconstitutedthemainmineralframeworkofbricks,whichwereresponsibleforthemechanicalstrength.Theglassphasesincreasedwiththeincreaseoffiringtemperature,thecrystallinephaseswereembeddedinglassymatrixandf
7、ormedstrongentirety,whichcontributedtoincreasingthestrengthanddecreasingthewaterabsorptionofbricks.Theoptimumtemperaturesystemwerefoundtobethattheheatingratewasabout6e/min,thefiringtemperatureandholdingtimewereintherangeof980-1030eand2-
