三山岛金矿高质量浓度充填料浆流动特性及管道阻力研究

Study on the Flow Characteristics and Pipeline Transport Resistance of Filling Slurry with High Mass Concentration in Sanshandao Gold Mine

三山岛金矿西岭矿区由于充填倍线高及料浆质量浓度高,导致料浆输送困难,通过开展流变、L管自流及半工业加压环管试验,对该矿高质量浓度充填料浆流动特性及管道输送阻力进行相关研究。研究结果表明:充填料浆在质量浓度为74%~76%,灰砂比为1∶4的条件下达到膏体状态;由L管自流试验可知,随着料浆质量浓度的增加,料浆屈服应力、塑性黏度及流动阻力明显增加,输送倍线减小,而随着灰砂比的降低,料浆屈服应力降低、塑性黏度增加,但流动阻力降低,导致料浆流速增加,输送倍线增加;充填料浆沿管道的输送阻力与充填料浆屈服应力、塑性黏度、输送流速及输送管道直径有关;通过半工业加压环管试验,管道压力损失与灰砂比、质量浓度和泵送流速均呈正相关,在灰砂比为1∶4、料浆质量浓度为76%且流速最大(1.5 m/s左右)时管道压力损失最大,直管压力损失为4.324 Pa/m。

The Xiling mining area of Sanshandao gold mine existed the filling problems that the slurry was difficult to be transported according to the high times line of transmission and large mass concentration.Therefore,by rheological tests,L-pipe self-flow tests and semi-industrial pressurized looping pipe tests,the flow characteristics and the pipeline transportation resistance of filling slurry with high mass concentration were studied.The results show that the filling slurry reaches the paste state at a mass concentration of 74%~76%and the cement-sand ratio of 1∶4.L-pipe self-flow tests show that as the slurry concentration increases,the yield stress,plastic viscosity and flow resistance of the slurry increase significantly and the times line of transmission decreases,while as the cement-sand ratio decreases,the yield stress of the slurry decreases and the plastic viscosity increases,but the flow resistance decreases,resulting in the increase of the slurry flow rate and the times line of transmission.The transportation resistance of the filling slurry along the pipeline is related to the yield stress,plastic viscosity,transportation velocity and diameter of transportation pipeline.Through semi-industrial pressurized looping pipe tests,the pressure loss of the pipe is positively related to the cement-sand ratio,concentration and pumping flow velocity,and the pressure loss of the pipeline is the highest at the cement-sand ratio of 1∶4,the mass concentration of 76%and the maximum flow rate(around 1.5 m/s),with a straight pipeline pressure loss of 4.324 Pa/m.