超声波对全尾砂砂浆流变特性的影响

doi:10.11896/cldb.18060024

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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.

Key words： ultrasound wave backfilling silo unclassified tailings slurry rheology properties

Published: 12 March 2020

CLC number:	TD853
	TU521.1

Fund:This work was financially supported by the National Natural Science Foundation of China (51641401).

About author:: Liyi Zhureceived his M.S. degree in January 2019 from the University of Science and Technology Beijing (USTB). Currently he studying for a Ph.D. in mining engineering from USTB. He is currently a M.E. degree in School of Civil and Resource Engineering, University of Science and Technology Beijing under the supervision of Vice.Prof. Wensheng Lv and Prof. Peng Yang. His research has focused on thickness and rheological process of filling slurry under the action of acoustic wave and ultrasonic wave; Wensheng LYUreceived his B.E. degree in Mining Engineering from the University of Science and Techno-logy Beijing (USTB) in 1990. After received M.E. degree, he served in School of Civil and Resource Engineering, USTB till now. He is currently an associate professor and deputy director, Mining Engineering Department. He performed collaborative research in 2015—2016 in UA (The University of Adelaide). He has published more than 50 journal papers, authorized 3 national invention patents and published 2 monographs. His research inte-rests are mining methods for underground hard rock deposits, tailings disposal and comprehensive utilization technologies, etc.

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Cite this article:

ZHU Liyi,LYU Wensheng,YANG Peng, et al. Effect of Ultrasonic on Rheological Properties of Unclassified Tailings Slurry[J]. Materials Reports, 2020, 34(6): 6088-6094.

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http://www.mater-rep.com/EN/10.11896/cldb.18060024 OR http://www.mater-rep.com/EN/Y2020/V34/I6/6088

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