胶结剂种类及掺量对尾砂胶结膏体充填材料性能的影响  

The influence of types and content of binders on the properties of cemented paste backfill

作　　者：郑娟荣[1] 谷迪 赵雪飞[1] 

机构地区：[1]郑州大学土木工程学院,郑州450002

出　　处：《有色金属（矿山部分）》2015年第6期83-88,共6页NONFERROUS METALS(Mining Section）

基　　金：国家自然科学基金资助项目(51274174)

摘　　要：对三种胶结剂的不同掺量对粗、细尾砂胶结膏体充填材料性能的影响规律进行了试验研究,并对部分硬化体进行了扫描电镜分析。试验结果表明,无论尾砂是粗或细,均随胶结剂外掺量增加,硬化体7d和28d抗压强度增加,但对料浆析水率影响不大;对于细尾砂,在5%胶结剂掺量下,矿渣基复合胶结剂的胶结强度比纯硅酸盐水泥(包括复合硅酸盐水泥)强;对于粗尾砂,在30%胶结剂掺量下,矿渣基复合胶结剂的胶结强度比硅酸盐水泥弱。扫描电镜分析表明,在胶结膏体充填材料中矿渣基复合胶结剂水化产物比纯硅酸盐水泥水化产物分布均匀,前者比后者显微结构更密实。对胶结膏体充填材料的增强机理分析表明,增加充填集料之间的胶结连结、晶体连结能有效提高充填硬化体强度。结论是要制备低胶结剂掺量的胶结膏体充填材料,分散胶结剂水化产物是有效措施。An experimental study on the influence of the different contents of three types of binders on the properties of Cemented Paste Backfill （CPB） with coarse or fine tailings is carried out. The test results show that the 7 d and 28 d compressive strengths of CPB increase and the dewatering percentage of CPB is little affected when the content of binder increased, regardless of railings type. The cementing strength of Complex Binder CB is higher than that of Portland Cement PC （including composite Portland Cement）in CPB with fine tailings and 5 ~/~0 binder content, while the cementing strength of Complex Binder CB is lower than that of Portland Cement PC in CPB with coarse railings and 30% binder content. Scanning Electron Microscope （SEM） show that the hydration products of Complex Binder CB are more well-distributed than that of Portland Cement PC in CPB, the microstructure of the former is more compact than that of the latter. The analysis of the strengthening mechanism of CPB show that to increase the cement connection and crystal connection between aggregate and aggregate in CPB can validly enhance the compressive strengths of CPB. It is a conclusion that to disperse the hydration products of binder in CPB is a valid measure to prepare CPB with low binder content.

关 键 词：胶结膏体充填材料 胶结剂种类和掺量 性质 扫描电镜 增强机理 

分 类 号：TD926.4[矿业工程—选矿]