铜尾矿流变特性与管道输送阻力计算

流变参数是管道输送系统设计的基础,采用RST-SST型软固体流变仪进行尾矿浆体流变特性试验,确定了不同固相质量分数下尾矿浆体的屈服应力、黏度系数.当浆体固相质量分数大于70%后,屈服应力会随着固相含量的增加而显著上升.对矿浆进行剪切变稀试验发现,屈服应力可下降40.9%.针对不同尾矿浆体开展标准坍落度试验,当固相质量分数小于74%时,尾矿浆具有良好的流动性及较大的坍落度.利用得到的尾矿浆体的流变特性参数,进行了临界流速、摩阻损失的计算,为尾矿管道输送系统设计提供参考.

Study of the rheological characteristics of copper tailings and calculation of resistance in pipeline transportation

Rheological characteristics are fundamental to pipeline system design. Rheological tests were conducted to obtain the yield stress and viscosity index at different mass fractions. Slump tests were conducted to investigate the mobility of tailings slurry. Results show that the yield stress increases with the increase of mass fraction, especially when mass fraction is greater than 70%. After stirring in a high-speed activation stirrer, the yield stress in 70% mass fraction is decreased by 40. 9%. When the mass fractions are lower than 74%, high slump values are obtained. Based on the basic parameters obtained in the rheological tests, the key parameters of the pipeline system were calculated, including the critical flow rate and frictional resistance loss. These analyses results could serve as references for pipeline system design.