减水剂对煤矿胶结充填料浆输送性能影响研究  

Research on impact of water reducing agent for cemented tailing fill slurry conveying property

作　　者：傅小龙[1] 彭杨皓 李多[3] 程坤[3] 

机构地区：[1]中国黄金集团资源有限公司,北京100011 [2]中国矿业大学(北京)力学与建筑工程学院,北京100083 [3]中国矿业大学(北京)资源与安全工程学院,北京100083

出　　处：《煤炭科学技术》2017年第7期55-60,共6页Coal Science and Technology

基　　金："十一五"国家科技支撑计划资助项目(2009BAB48B02)

摘　　要：为了有效改善煤矿高浓度胶结充填料浆的输送性能,选用萘系和聚羧酸系2种高效减水剂,采用实验室试验的方法,借助流变仪对改性浆体的屈服应力、剪切应力等流变特性进行测试分析,并通过坍落度、扩展度和泌水率等因素对浆体的流动特性进行探究。结果表明:在充填料浆中添加掺量为1.5%萘系和0.4%聚羧酸系减水剂,浆体剪切屈服应力由634.4 Pa分别降低到301.6、314.7 Pa,塑性黏度由7.9 Pa·s分别提高到12.1、8.5 Pa·s;充填材料泌水率随减水剂掺量的增加不断增大,但聚羧酸减水剂泌水率更小,0.3%以下掺量时不泌水;结合环保要求考虑,建议优选聚羧酸系减水剂。In order to effectively improve the transport performance of high concentration cementing slurry in coal mine,naphthalene series and polycarboxylic acid type water reducing agents were used in experimental tests.The rheological properties,such as the yield stress and shear stress,etc,were analyzed under the help of rheometer. Considering the factors such as slump,slump flow,bleeding rate,etc,the flow characteristics of slurry were explored,and the impacts of water reducing agent to the transportation performance of coalmine cemented backfill slurry were researched. It turned out that when 1. 5% of naphthalene and 0. 4% of polycarboxylic acid type water-reducer were added,shear yield stress of slurry was reduced from 634.4 Pa to 301.6 Pa and 314.7 Pa. Plastic viscosity increased from 7.9 Pa·s to 12.1 Pa·s and 8.5 Pa·s respectively. Filling materials＇ bleeding rate increased with the increasing of the dosage of water reducing agent,but the polycarboxylate-bleeding rate was smaller. No bleeding under 0.3%. Taking environmental protection into account,polycarboxylate-based will be a better choice.

关 键 词：减水剂 管道输送 流变特性 流动特性 

分 类 号：TD823.7[矿业工程—煤矿开采]