Experimental Study on Ratio Optimization of Large Particle Size Gangue Slurry and Full-scale Ring Pipe Conveying Resistance
In order to determine the optimal ratio of gangue slurry with different particle size ranges,the basis for dividing the particle size of large-sized gangue slurry was provided,and the optimization principle of gangue slurry transportation performance was proposed.The transportation performance testing indicators and screening criteria were designed,and the variation laws of the transportation performance of gangue slurry with concentration and particle size grading in two particle size ranges of 0-2 mm and 0-5 mm were revealed.The variation mechanism of the transportation performance indicators of large-sized gangue slurry was analyzed,and finally,the optimal ratio of large-sized gangue slurry was determined based on the transportation performance screening criteria.The feasibility of the optimal ratio of slurry was verified through full-scale ring pipe conveying testing.The research results indicate that the small particle size gangue with a diameter of 0-0.15 mm in the gangue slurry has strong water retention and suspension ability,which significantly improves the transportation performance of the gangue slurry;The settling rate of the slurry decreases with increasing concentration and increases with increasing proportion of coarse-grained gangue;the viscosity of the slurry increases with increasing concentration and gradually decreases with increasing proportion of coarse-grained gangue.The pressure loss of gangue slurry in the straight pipe section is affected by concentration and particle size distribution,and in the bent pipe section,it is also affected by the curvature radius of the pipeline.
large particle sized gangue slurrywater retention and suspensiontransportation performanceratio optimizationfull-scale ring pipe conveying
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