Effect of Ultrasonic on Rheological Properties of Unclassified Tailings Slurry
ZHU Liyi1, LYU Wensheng1, YANG Peng2, WANG Zhikai3, WANG Zhijun2
1 School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2 Beijing Key Laboratory of Information Service Engineering, Beijing Union University, Beijing 100101, China; 3 China Enfi Engineering Corporation, Beijing 100038, China
Abstract: In order to improve the rheological properties of slurry in backfilling silo, sound field was innovatively introduced. Based on the transmission characteristics of ultrasonic sound field, the non-contact sound field was applied to the unclassified tailings slurry medium, and the effects of ultrasonic on rheological properties of the unclassified tailings slurry in backfilling silo were studied. The rheological parameters of unclassified tai-lings slurry with different concentrations were tested using the Brookfield soft-solid rheological rheometer (R/S-SST) and combined with the ultrasonic mechanism to analyze the effects and reasons. The results show that the ultrasonic waves of 36 W, 62 W, 85 W and 100 W at 20 kHz and 40 kHz frequency were applied to the five kinds of unclassified tailings slurry with the concentrations of 70%, 72%, 74%, 76% and 78% respectively, and the plastic viscosity can be reduced from 6.421% to 23.504%, and the yield stress can be reduced from 7.773% to 33.125%. There is a significant linear relationship between plastic viscosity and power, and there are obvious linear, quadratic, Boltzmann and Logistic distributions between yield stress and power. Simultaneously, 40 kHz ultrasonic effects are better than 20 kHz and high power ultrasound is superior to low power, other things being equal in test. Ultrasound can make the tailings slurry particles produce mechanical vibration, and produce significant cavitation and thermal effects. The ultrasound is capable of reducing the plastic viscosity and yield stress, and improving the fluidity of the tailings slurry and discharged sand in the sand silo.
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2020, Vol. 34 
