Effect of ultrasound on the flocculation-sedimentation and thickening of unclassified tailings

Zhu, Liyi; Lyu, Wensheng; Yang, Peng; Wang, Zhikai

doi:10.1016/j.ultsonch.2020.104984

Cited by 27 publications

(11 citation statements)

References 40 publications

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“…This trend did not change in the presence of flocculant. In several previous studies, it was also reported that ultrasound could be detrimental to the flocculation process related to the application conditions [44][45][46]. On the other hand, it is seen in Figure 7e-h that lower turbidity values were obtained with ultrasound in most experiments because of the formation of a more compact sediment bed in the presence of ultrasound.…”

Section: Resultsmentioning

confidence: 65%

Ultrasound supported flocculation of borate tailings with differently charged flocculants

Demir¹,

Güngören²,

Baktarhan³

et al. 2021

Journal of Boron

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Mining activities are followed by mineral processing and wet beneficiation methods which generate a significant amount of tailings. Slime fractions are discharged to the tailing ponds with associated process water and this causes storage and disposal difficulties and creates severe environmental problems. Therefore, dewatering these tailings is necessary for both economic and environmental aspects. In this study, the flocculation behaviors of the boron tailings from Ağıldere and Hisarcık (Turkey) were studied in the presence of anionic, cationic, and nonionic flocculants. The results showed that the free settling condition was optimum for the Ağıldere sample. On the contrary, the settling rate of the Hisarcık sample increased considerably by the use of flocculants with a significant decrease in the turbidity of the suspension. Flocculation experiments indicated that the effect of the flocculant type on the flocculation of the Hisarcık sample can be generally ordered as anionic>cationic>non-ionic>no-flocculant. Furthermore, ultrasound was used as a supporting application. The results indicated that although the ultrasound application decreased the settling rate of both samples, lower sediment bed heights were obtained for the Hisarcık sample with ultrasound because of the formation of a more compact sediment bed in the presence of ultrasound.

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Section: Resultsmentioning

confidence: 65%

Ultrasound supported flocculation of borate tailings with differently charged flocculants

Demir¹,

Güngören²,

Baktarhan³

et al. 2021

Journal of Boron

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show abstract

“…Another scenario is that ultrasound pretreatment effectively forms air flocs consisting of aggregates of graphite particles, air bubbles, and agents. These air flocs have been observed during the ultrasound process, and several studies have confirmed their formation. ,− Zhang et al (2022) reported that the application of ultrasound created air flocs that consisted of graphite particles, air bubbles, and reagents, which increased the floatability of graphite particles. The formation of air flocs is critical in the flotation process as it facilitates adhesion between graphite particles and air bubbles, promoting premineralization and direct up-floating of graphite particles into the concentrate.…”

Section: Resultsmentioning

confidence: 99%

Ultrasound Pretreatment for Enhancing Fine and Ultrafine Flake Graphite Flotation Beneficiation

Tong,

Lu,

et al. 2024

ACS Omega

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With the severe depletion of coarse flake graphite (a critical raw material) resources, developing and utilizing fine and ultrafine graphite resources have recently attracted attention. Froth flotation is a widely used technique for the initial enrichment of graphite; however, the flotation selectivity decreases significantly along with particle size reduction. Ultrasound pretreatment would be a promising method to improve the flotation of fine particles. As an innovative approach to understand better the flotation response of different flake graphite sizes, this study conducted a comparative analysis based on flotation concentrate yield and ash as well as ash removal rate between the flake graphite with various particle sizes after ultrasound pretreatment. Particle size, X-ray powder diffraction, and scanning electron microscopy and energy dispersive X-ray spectroscopy analyses were used to investigate the effect of ultrasound treatment on mineralogical properties of the flake graphite with varied particle sizes. Process outcomes indicated that the flotation performance of fine flake graphite (mean chord length: 62.63 μm) was significantly enhanced after ultrasound pretreatment. However, flotation of the ultrafine flake graphite (mean chord length: 24.97 μm) after ultrasound treatment was limited due to the difficulty of generating sufficient fragmentation and dissociation by microjets and shock waves formed by the cavitation effect. Compared with conventional flotation, the concentrate yield of ultrasound flotation increased from 88.95 to 94.98%, ash content decreased from 5.72 to 4.87%, and ash removal rate enhanced from 36.94 to 42.61%. Particle size and mineral property analyses confirmed that further crushing and dissociation of the larger flake graphite after ultrasound pretreatment would be the main factors contributing to improved flotation performance. Additionally, the formation of air flocs in the coarse flake graphite during the ultrasound pretreatment process facilitated the flotation recovery of the crushed graphite particles.

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“…The authors postulated several ultrasonic mechanisms for improved oil recovery, such as cavitation, heat production, capillary pressure, and interfacial tension reduction. Low equipment costs, a prolonged effect on oil recovery, and good safety are additional benefits of the ultrasonic approach [31,43,44]. A summary of the studies reviewed in this paper is shown in Table 1.…”

Section: Observationsmentioning

confidence: 99%

The Utilization of Ultrasound for Improving Oil Recovery and Formation Damage Remediation in Petroleum Reservoirs: Review of Most Recent Researches

et al. 2022

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The ultrasound method is a low-cost, environmentally safe technology that may be utilized in the petroleum industry to boost oil recovery from the underground reservoir via enhanced oil recovery or well stimulation campaigns. The method uses a downhole instrument to propagate waves into the formation, enhancing oil recovery and/or removing formation damage around the wellbore that has caused oil flow constraints. Ultrasonic technology has piqued the interest of the petroleum industry, and as a result, research efforts are ongoing to fill up the gaps in its application. This paper discusses the most recent research on the investigation of ultrasound’s applicability in underground petroleum reservoirs for improved oil recovery and formation damage remediation. New study areas and scopes were identified, and future investigations were proposed.

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Effect of ultrasound on the flocculation-sedimentation and thickening of unclassified tailings

Cited by 27 publications

References 40 publications

Ultrasound supported flocculation of borate tailings with differently charged flocculants

Ultrasound supported flocculation of borate tailings with differently charged flocculants

Ultrasound Pretreatment for Enhancing Fine and Ultrafine Flake Graphite Flotation Beneficiation

The Utilization of Ultrasound for Improving Oil Recovery and Formation Damage Remediation in Petroleum Reservoirs: Review of Most Recent Researches

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