Enhanced desulfurizing flotation of coal using sonoelectrochemical method

Zhang, Hongxi; Hou, Xiaoyang; Xu, Shi-Xun; Li, Zhi-Long; Yu, Haifeng; Shen, Xuehua

doi:10.1016/j.ultsonch.2013.02.007

Cited by 14 publications

(4 citation statements)

References 22 publications

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“…Zhang et al 25 reported the enhanced desulfurizing flotation of high sulfur coal by a sonoelectrochemical method. They found the optimal conditions (i.e., additive concentration, sonoelectrolytic time, current density, and ultrasound intensity) for the coal samples with different size fractions and reported a sulfur reduction of up to 75.4%.…”

Section: Introductionmentioning

confidence: 99%

Electrooxidative Desulfurization of a Thiophene-Containing Model Fuel Using a Square Wave Potentiometry Technique

et al. 2015

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A dynamic electrochemical technique was used for desulfurization of thiophene-containing solutions. First, adsorption of thiophene from an aqueous solution onto a platinum electrode surface and electrooxidative behavior of thiophene were studied using a cyclic voltammetry technique, and then, a square wave potentiometry method was utilized to electrochemically desulfurize the aqueous thiophene solution and a thiophene-containing model fuel. Results indicated that, for thiophene molecules, the best adsorption potential is 0.2 V and the maximum electrooxidation rate occurs at 1.1 V. Also, the optimal square wave frequency was found as 50 Hz. Ion chromatographic measurement of sulfate ion concentration revealed that reaction conversion was 100% in the electrooxidative desulfurization of aqueous thiophene solution. The high desulfurization efficiency can be attributed to excellent electrocatalytic activity of the platinum electrode and performing experiments at the best operating conditions. On the basis of gas chromatographically quantitated thiophene concentration in the hydrocarbon phase, desulfurization reactions reached a conversion of about 88% during electrooxidative desulfurization of a model fuel/aqueous electrolyte emulsion. The lower desulfurization efficiency can be attributed to addition of a mass transfer (from hydrocarbon to aqueous phase) resistance and lessening the overall thiophene concentration. Ion chromatographic analysis of the aqueous phase revealed that only 38% of thiophene molecules were completely oxidized to sulfate ions. Fourier transform infrared spectroscopy studies of the hydrocarbon and the aqueous phases showed that the remaining part of converted thiophene molecules were partially oxidized to a sulfone and an organic sulfate compound. Due to polarity of these components, which results in their aqueous phase solubility, no more steps were required to separate the products of desulfurization from the hydrocarbon phase. On the basis of the obtained results, electrochemical desulfurization can be proposed as an effective alternative for the commercial hydrodesulfurization processes.

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Section: Introductionmentioning

confidence: 99%

Electrooxidative Desulfurization of a Thiophene-Containing Model Fuel Using a Square Wave Potentiometry Technique

et al. 2015

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“…Significantly, however, the effect of ultrasonic treatment on the removal efficiency did not continue for more than 3 min. Zhang et al [121] investigated the enhancement of desulfurizing flotation using the sonoelectrochemical method. The sulfur reduction reached up to 69.4%.…”

Section: Desulfurationmentioning

confidence: 99%

A Review of Ultrasonic Treatment in Mineral Flotation: Mechanism and Recent Development

Zhang,

Du,

et al. 2024

Molecules

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Ultrasonic treatment has been widely used in the mineral flotation process due to its advantages in terms of operational simplicity, no secondary pollutant formation, and safety. Currently, many studies have reported the effect of ultrasonic treatment on mineral flotation and shown excellent flotation performance. In this review, the ultrasonic mechanisms are classified into three types: the transient cavitation effect, stable cavitation effect, and acoustic radiation force effect. The effect of the main ultrasonic parameters, including ultrasonic power and ultrasonic frequency, on mineral flotation are discussed. This review highlights the uses of the application of ultrasonic treatment in minerals (such as the cleaning effect, ultrasonic corrosion, and desulfuration), flotation agents (such as dispersion and emulsification and change in properties and microstructure of pharmaceutical solution), and slurry (such formation of microbubbles and coalescence). Additionally, this review discusses the challenges and prospects of using ultrasonic approaches for mineral flotation. The findings demonstrate that the application of the ultrasonic effect yields diverse impacts on flotation, thereby enabling the regulation of flotation behavior through various treatment methods to enhance flotation indices and achieve the desired objectives.

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“…32 Ultrasound also has a positive effect on the flotation desulfurization of high sulfur coal. 33,34 In addition, ultrasonic treatment has provided good results for flotation and ash removal from oil shale. 35 As ultrasonic treatment has both oscillation and cavitation effects, surface cleaning and treatment can be achieved to pretreat the minerals.…”

Section: Introductionmentioning

confidence: 99%

Effect of Gas Input Conditions and Ultrasound on the Dynamic Behavior of Flotation Bubbles

et al. 2022

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Ultrasonic flotation is useful for fine low-rank coal purification; however, the efficiency of ultrasonic flotation still needs to be improved. Because the dynamic behavior of flotation bubbles has significant effects on their flotation efficiency, it was investigated under different gas input conditions with and without ultrasound using the volume of fluid method and h-speed imaging. The results indicated that the gas input method can influence the final kinetic behavior of the flotation bubbles by changing the morphology of the initial bubble. With an increase in the size and aspect ratio of the bubble, the bubble deformation and velocity increased, and the range of motion of the bubble increased and then decreased. Meanwhile, the size of the bubble increased with an increase in the thickness of the vibrating plate of the ultrasonic transducer owing to the aggregation of the bubbles under the influence of ultrasound.

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Enhanced desulfurizing flotation of coal using sonoelectrochemical method

Cited by 14 publications

References 22 publications

Electrooxidative Desulfurization of a Thiophene-Containing Model Fuel Using a Square Wave Potentiometry Technique

Electrooxidative Desulfurization of a Thiophene-Containing Model Fuel Using a Square Wave Potentiometry Technique

A Review of Ultrasonic Treatment in Mineral Flotation: Mechanism and Recent Development

Effect of Gas Input Conditions and Ultrasound on the Dynamic Behavior of Flotation Bubbles

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