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时间:2020-03-25
《尾砂级配对充填体强度的影响及优化.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第66卷第4期有色金属(矿山部分)2014年7月doi:10.3969/j.issn.1671-4172.2014.04.008尾砂级配对充填体强度的影响及优化汪海萍。,谭玉叶~,昊姗一,周家祥。,王雨s(1.北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083;2.北京科技大学土木与环境工程学院,北京100083;3.武汉钢铁集团矿业有限责任公司大冶铁矿,武汉430080)摘要:尾砂级配是影响充填体力学性质的重要参数,研究级配对充填体强度的影响具有重大现实意义。以A、B和C三种全尾砂为试验材料,通过激光粒度分析仪测得三种全尾砂粒径级配组成,结合全尾砂
2、充填体强度,得到级配与充填体强度之间的关系:C全尾砂级配优于B,A全尾砂级配较差;级配越好,充填体强度越高。借助XRD能谱分析和SEM电镜分析可得,A试块和C试块由于级配不同,导致水化反应初期(3d)A试块钙矾石(针状)明显少于后者,28d报告时C试块团絮状胶凝物黏结更紧密,从而影响了试块的充填体强度,使得级配较优的c试块充填体强度明显高于A试块。通过优化级配的方法对级配较差的全尾砂A进行优化分级,提高了充填体强度。关键词:级配;充填体强度;XRD能谱分析;SEM;优化级配中图分类号:TD853.34文献标志码:A文章编号:1671—4172(2014)04—0026
3、—05Efectsandoptimizationoftailingsgradationonthebackfil1strengthWANGHaiping~,TANYuye~,WUShan~,ZHOUJiaxiang。。WANGYu。(1.StatekeyLaboratoryofHigh—EfficientMiningandSafetyofMetalMinesofMinistryofEducation.UniversityofScienceandTechnologyBeijing,Beijing100083,China;2.SchoolofCivilandEnvironm
4、entalEngineering,UniversityofScienceandTechnologyBeijing,Beijing100083,China;3.DayeIronMineofMiningLimitedCompanyofWuhanIronGroup,Wuhan430080,China)Abstract:Tailingsgradationisanimportantparameteraffectingthephysicalpropertiesofthebackfill,SOtheresearchingontheeffectsofgradationonthebac
5、kfillstrengthisofgreatpracticalsignificance.UsingA,B,Cthreedifferentunclassifiedtailingsasexperimentalrawmaterials,thegradationcompositionofthreedifferentunclassifiedtailingswasanalyzedbylaserparticlesizeanalyzer.Combinedwiththebackfillstrengthofunclassifiedtailings,therelationshipbetwe
6、engradationandbackfillstrengthwasprovided:thegradationofCunclassifiedtailingsisbetterthanB,andAistheworstofall;thebettergradationis,thehigherbackfillstrengthis.BecauseofthedifferentgradationbetweenAandC,theettringite(needle-shaped)ofAissignificantlylessthanCduringthebeginningpe—riod(3da
7、ys)ofhydratingreactionbythemeansofXRDandSEM.In28days,thecementingmaterialofCcementscloserSOthatthebackfillstrengthofCishigherthanA.Atlast,thebackfillstrengthofAisimprovedbythemethodofoptimizingthegradation.Keywords:gradation;backfillstrength;XRDspectrumanalysis;SEM;gradationopt
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