Abstract
Ultra-fine tailings cemented paste backfill (UCPB) exhibits special rheological characteristics with the effect of an ultrasonic sound field. In this study, in order to explore the thickening effect of slurry under ultrasonic wave action, we examined the rheological properties with ultrasonic wave tests of UCPB and the rheological properties after ultrasonic wave tests of UCPB. We found that the rheological curve of the slurry changed; the Herschel–Bulkley (HB) model in the initial state transformed into the Bingham model under the action of ultrasound. Ultrasonic waves have a positive effect on reducing slurry viscosity and yield stress. The rheological test of the slurry with ultrasonic wave action had a positive effect on significantly reducing the apparent viscosity and initial yield stress of slurry with a 62% mass concentration. The rheological test of slurry with ultrasonic wave action and the rheological test after ultrasonic wave action both have positive effects on reducing the viscosity and yield stress of the slurry with a 64% to 68% mass concentration; the overall effect of reducing the viscosity and yield stress of UCPB is greater after ultrasonic wave action of UCPB.
Highlights
The rheological characteristics of mortar in the process of conveying slurry is one of the important parameters for judging fluidity, which directly affects the stability of the tailing silo, pipe conveying, and other links [1,2,3]
Testing and Monitoring of Samples To obtain the rheological parameters of Ultra-fine tailings cemented paste backfill (UCPB), the rheological tests, rheological properties under ultrasonic wave action, and rheological properties after ultrasonic wave ac
The experimental studies showed that the rheological behavior of UCPB mixtures may be sufficiently described by the Hershel–Bulkley equation as follows: τ =τ 0 + μγ n where τ (Pa) is the shear stress; γ (1/s) is the shear rate, n is the Hershel–Bulkley (H-B)
Summary
The rheological characteristics of mortar in the process of conveying slurry is one of the important parameters for judging fluidity, which directly affects the stability of the tailing silo, pipe conveying, and other links [1,2,3]. Xue et al found that a high temperature environment and the addition of fly ash reduced the yield stress of slurry and enhanced the rheological properties of slurry [16]. Relevant studies have used ultrasonic wave action to improve the rheological properties of slurry such as sludge, coal water slurry, and cement tailing mortar, and have achieved good effects [26,27,28,29]. Zhu et al found that ultrasonic wave action could significantly improve the rheological properties of filling slurry and reduce the plastic viscosity and yield stress of total tailings slurry [33,34]. We analyzed the effect of ultrasonic wave action on the rheological properties of slurry in order to provide a reference for its application in the mine filling process
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