Abstract
In order to realize the gravity-flowed convey of high concentration backfill slurry of aeolian sand at 15 times line, the industrial test on convey by high concentration slurry backfill pipeline is carried out based on the calculation and analysis of backfill pipeline with respect to the design of the backfill pipeline and the critical velocity of slurry in Yuyang Coal Mine. The calculation and test results show that the high concentration aeolian sand backfill slurry has good fluidity, which drops markedly when the slurry concentration exceeds 72%. In order to achieve gravity-flowed convey of backfill slurry, it must be subject to an upper limit of concentration of 75%; The critical velocity of backfill slurry convey in Yuyang Coal Mine is 1.19m/s, with an operating velocity of 4.19m/s, which is 3.5 times of the critical velocity. With a maximum conveying capacity of backfill pipeline of 396m3/h, and high reliability in the pipeline convey of slurry, the great times line gravity-flowed convey of high concentration backfill slurry with aeolian sand as aggregate is achieved.
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