Research on impact of water reducing agent for cemented tailing fill slurry conveying property
Fu Xiaolong
Peng Yanghao
Li Duo
Cheng Kun
Abstract：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.
Keywords：water reducing agentpipeline transportationrheological characteristicsflow characteristics
Publication Date：2017-01-01
Pages：6( 55-60 )