玲珑金矿胶结剂固结尾砂的微观实验

王炳文; 高利晶; 赵文华; 李亚楠; 丁伟; 李钊

玲珑金矿胶结剂固结尾砂的微观实验

Microscopic experiment of consolidating tailings by Linglong cementitious material

摘要

摘要: 为探究玲珑金矿胶结剂在不同条件下对尾砂固结过程的影响,参照普通硅酸盐水泥,设计了一系列不同灰砂比、料浆质量浓度和养护龄期的充填体试块,进行力学实验测定其单轴抗压强度,并借助XRD、SEM对尾砂充填体物相组成和微观形貌进行分析。结果表明:胶结剂水化反应会产生钙矾石和C—S—H凝胶,促使尾砂充填体固结硬化;养护龄期、灰砂比会影响水化产物中的钙矾石和C—S—H凝胶的含量及其形态的发展,养护龄期和灰砂比的增大,水化产物含量增加,彼此搭接形成致密的网状结构,宏观上表现为强度的提高;料浆质量浓度则会影响试块的孔隙结构,从而影响强度。

Abstract: InordertoinvestigatetheinfluenceofLinglongcementitiousmaterialontheconsolidationof tailingsunderdifferentconditions,aseriesofbackfillblocksatdifferentratios,differentdensitiesand differentcuringagesaredesignedwithordinaryPortlandcementcontrolandtheiruniaxialcompressive strengthismeasuredthroughstrengthtest.Thenthephasecompositionandthemicro-morphologyofthe tailingsbackfillarediscussedbysuchmeasuringandtestingtechniquesasXRDandSEM.Theresults showthatthehydrationreactionofthecementitiousmaterialproducesettringiteandC—S—Hgel,and promotestheconsolidationofthetailingsbackfill;theageandtheratioofcementitiousmaterialtotailingswillaffectthedevelopmentofthecontentandmorphologyofettringiteandC—S—Hgelinthehydrationproducts,andthecontentofhydrationproductswillincreasewiththeincreaseofageandthera
tioofcementitiousmaterialtotailings.Thecontent of the productsincreasesand overlapsto form a densenetworkstructure,whichismacroscopicallyexpressedasanincreaseinstrength;themassconcentrationaffectstheporesinthetestblock,therebyaffectingthestrength.

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