掺固硫灰水泥胶结磷尾矿充填料浆流变性能

Rheological properties of filling slurries cemented phosphate tailings with cement and CFBC ash

采用跳桌流动度仪和旋转黏度计研究了掺固硫灰水泥胶结磷尾矿充填料浆的流变性能,分析了固硫灰掺量、胶砂比及质量浓度对流变性能的影响。研究表明,掺固硫灰水泥胶结磷尾矿充填料浆的流变曲线符合宾汉塑性流体特征,料浆的触变性很弱。料浆中固硫灰掺量增大时,流动度降低,塑性黏度增大。当胶砂比减小至1∶8或质量浓度高达76%时,固硫灰用量对流动度和塑性黏度的影响程度显著降低。料浆质量浓度为74%时,屈服应力与固硫灰掺量和胶砂比呈正相关。质量浓度高达76%时,固硫灰掺量对屈服应力无显著影响。当料浆胶砂比为1∶5~1∶6,质量浓度为76%时,为保证料浆的顺利泵送应控制固硫灰掺量在40%以内。

Rheological properties of filling slurries cemented phosphate tailings with cement and CFBC ash are researched by fluidity instrument and rotary viscosimeter.The results show that rheological properties of filling slurries with phosphate tailings-cement-CFBC ash conformed to Bingham plastic fluid characteristics,and thixotropy of the filling slurries is very small.Increasing the content of CFBC ash,the fluidity of slurry reduces and plastic viscosity increases.When the binder-sand ratio is reduced to 1∶8 or the mass concentration is as high as 76%,the influence of the amount of CFBC ash on the fluidity and apparent viscosity is significantly reduced.When the mass concentration of slurry is 74%,the yield stress is positively correlated with the content of CFBC ash and the binder-sand ratio.The content of CFBC ash has no significant effect on the yield stress for slurry with the mass concentration of 76%.When the binder-sand ratio is 1∶5-1∶6,to ensure the smooth pumping of slurry with mass concentration of 76%,the content of CFBC ash should be controlled within 40%.