以大直径管道输送超细全尾砂胶结充填料浆技术为研究对象,构建大直径输送管道三维模型,基于三维单精度解算器Fluent-3D中Reliable k-epsilon模型,研究大直径管道内浓度对超细全尾砂胶结充填料浆输送特性的影响。结果表明,在充填倍线为3的条件下,灰砂比为1∶6的超细全尾砂胶结充填料浆在200 mm直径管道中输送时,在弯管下部内侧管壁位置出现空蚀区,随着浓度的增大,空蚀区范围先增大,后趋于稳定；随料浆浓度的增大,浓度小于64%时,管内料浆平均流速线性增长,料浆浓度大于64%时,管内料浆平均流速先增大后减小；随着料浆浓度的增大,浓度小于68%时,料浆在管内流动的压力损失以较大速率增长,浓度大于68%时,料浆流动的压力损失增长缓慢。研究认为,66%浓度为200 mm直径管道输送超细全尾砂胶结充填料浆的最佳输送浓度。%Taking the transportation technology of ultrafine tailings cemented backfilling slurry with large diameter pipe as object,three dimensional model of large diameter transportation pipe was constructed. Based on reliable k-epsilon model of fluent-3D,the effects of slurry concentration within pipe on the transport properties of ultrafine tailings cemented backfilling slurry of were studied. The results showed that under the conditions that stowing ratio was 3 and the cement-sand ratio was 1 ∶6,the cavitation zone appeared at the inner pipe turning when cement backfilling slurry of ultrafine full-tailings was transported in 200 mm pipe. Along with the increase of concentration,the scale of cavitation enlarged at first and kept steady then;Along with the increase of concentration,the average velocity of slurry at inner pipe grew linearly if the concentration was less than 64%,and the trend of average velocity was increasing at first and decreasing then if the slurry concentration was greater than 64%;Along with the increase of concentration,the pressure loss increased with high speed if slurry concentration was less than 68%,and the pressure loss grew slowly if slurry concentration was greater than 68%. It is pointed out that the best transporta-tion concentration with ϕ200 mm pipe for cemented backfilling slurry of ultrafine full-tailings was 66%.
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