高浓度混合骨料充填料浆管道输送特性试验研究

为研究高浓度混合骨料充填料浆管道自流输送规律,利用甘肃某镍矿充填管道输送系统进行工业试验.首先,通过工业试验获取不同条件下的料浆管输阻力,并分析了管输阻力与料浆流速、料浆浓度与石粉掺加量的关系;然后,基于变量相互独立的性质假设建立了管输阻力数学模型,同时探讨了管输阻力影响因素的交互作用大小;最后,通过流变试验及机理研究...

Experimental Study on Pipeline Transport Characteristics of High-Concentration Mixed Aggregate Filling Slurry

In order to study the pipeline gravity transport law of high-concentration mixed aggregate filling slurry, an industrial test was carried out using the filling pipeline transport system of a nickel mine in Gansu Province. Firstly, the pipeline resistance of slurry under different conditions was obtained through industrial test, and the relationships between pipeline resistance and slurry velocity, slurry concentration and content of stone powder were analyzed. Then, based on the assumed independent nature of variables, a mathematical model of pipeline resistance was established, and the interaction of influencing factors of pipeline resistance was discussed. Finally, the results of pipeline resistance were verified and analyzed by rheological test and mechanism research. The results show that the pipeline resistance increases linearly with the slurry velocity, increase as a power function with the slurry concentration, and decreases first and then increases, namely in parabolic fashion, with the addition of stone powder. When the stone powder content is 30%, the pipeline resistance is the minimum. Interacted influencing factor pairs of pipeline resistance, ranked by interaction from large to small, are slurry concentration and flow velocity, stone powder content and flow velocity, and stone powder content and slurry concentration, resulting in the pipeline resistance varies in range of 2070?6920, 2180?5970, and 3140?5530 Pa/m, respectively. In addition, the rheological parameters increase with the increased slurry concentration, and decrease first and then increase with the increase of stone powder content, which verifies the variation law of pipeline resistance. The reasons for the change of slurry rheological characteristics and pipeline resistance include the vibration effect of flow velocity, the viscous effect of concentration and the flocculation theory of stone powder.