学术论文

      粉煤灰全尾砂胶结充填料

      Whole-tailings backfilling materials with fly ash

      摘要:
      实验选取了Ⅰ级和Ⅱ级两种粉煤灰,以石灰和脱硫石膏为激发剂制备的胶凝材料完全取代传统的胶结剂水泥,以胶砂比为1∶4,水胶比为1∶1左右制备的粉煤灰全尾砂充填料在45±1℃下养护3 d,强度可达5.432 MPa,在20±1℃下养护28 d强度可达3~7 MPa,满足一般矿山对充填料的要求.根据料浆质量分数和坍落度关系曲线,得到了该材料制备成的可泵送膏体质量分数范围为80.5%~83.0%.通过X射线衍射和扫描电镜分析,胶凝材料的水化产物主要为凝胶类物质、钙矾石和方解石.
      Abstract:
      Grade Ⅰ and grade Ⅱ fly ashes were chosen to produce a cementitious material to replace traditional cement using lime and flue gas desulphurization gypsum(FGD) as stimulation agents.Whole-tailings backfilling samples were prepared with the ratio of the cementitious material to whole-tailings being 1∶4 and the ratio of water to the cementitious material being 1∶1.The compressive strengths of the whole-tailings backfilling samples cured under the conditions of 45±1 ℃ for 3d and 20±1 ℃ for 28d are 5.432 MPa and 3 to 7 MPa,respectively.This generally satisfies the requirement of cemented backfilling for underground mining.Besides,relationship curves between the mass fraction of slurries and the slump were obtained and the mass fraction of the pumpable paste backfilling with the cementitious material is from 80.5% to 83.0%.By the analyses of X-ray diffraction and scanning electron microscopy,hydration products of the cementitious material are mainly gel,ettringite and calcite.
      作者单位: 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
      刊 名: 北京科技大学学报 ISTICEIPKU
      年,卷(期): 2011, 33(10)
      分类号: TD853.3
      机标分类号: TD8 TD4
      在线出版日期: 2012年4月21日
      基金项目: 国家自然科学基金资助项目