Enhancing flotation removal of unburned carbon from fly ash by coal tar-based collector: Experiment and simulation

Zheng, Kanghao; Zhang, Wenjun; Li, Yijiang; An, Ping; Wu, Feng; Xie, Guangyuan; Xia, Wencheng

doi:10.1016/j.fuel.2022.126023

Cited by 15 publications

(3 citation statements)

References 44 publications

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“…This innovative and sustainable utilization of fly ash reduces environmental burdens and opens up new opportunities for the beneficial reuse of waste materials. Numerous studies have established the promising potential of ash as an effective adsorbent for removing various contaminants (Zheng et al, 2023). By undergoing chemical and physical activation, the adsorption capacity of fly ash can be significantly enhanced.…”

Section: Introductionmentioning

confidence: 99%

Studies on Adsorption of Petroleum Products in Static Conditions

Sabadash,

Lysko

2023

J. Ecol. Eng.

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This paper provides an overview of the adsorption of petroleum products, focusing on various aspects such as adsorbent types, mechanisms of adsorption, factors influencing efficiency, kinetics, equilibrium, practical applications, and environmental implications. It explores the properties and characteristics of adsorbents, including activated carbon, zeolites, clay minerals, silica gel, and others, highlighting their interaction with petroleum products. The article delves into the theories and mechanisms governing the adsorption process, discussing physical and chemical adsorption as well as the role of forces like van der Waals, hydrogen bonding, and electrostatic interactions. The results of experimental investigations were conducted to evaluate the adsorption capacities of various adsorbents for petroleum products. The adsorption performance, kinetics, and equilibrium behavior of different adsorbents were analyzed, providing insights into their effectiveness in removing petroleum contaminants from aqueous solutions. The adsorption kinetics and equilibrium studies were explored through mathematical models like Langmuir and Freundlich isotherms. The practical applications of adsorption in the petroleum industry were discussed, including removing pollutants from wastewater, gas and diesel purification, and desulfurization. The environmental implications of adsorption technology in mitigating oil spills and reducing petroleum-related pollution were addressed. The conclusion emphasizes the significance of these studies in enhancing understanding, developing efficient solutions, and addressing environmental challenges associated with the petroleum industry. Ongoing research in this field aims to further improve adsorption processes for a more effective and sustainable approach.

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Section: Introductionmentioning

confidence: 99%

Studies on Adsorption of Petroleum Products in Static Conditions

Sabadash,

Lysko

2023

J. Ecol. Eng.

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“…Unburned carbon can be segregated from CFA for beneficial reuse by sieving, 7 gravity separation, 8 electrostatic separation, 9 froth flotation, 10 acid digestion, and sink-float technique (density separation). 11 At present, froth flotation is commonly used as a separation technique in the concentrating and coal beneficiation industries, relying on the capability of the bubbles to cling to the surface of specific particles in a selective manner.…”

Section: Introductionmentioning

confidence: 99%

Effect of Prestirring Time on Carbon Removal from Coal Fly Ash in the Flotation Technology

et al. 2023

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Coal fly ash (CFA) is one of the industrial byproducts of burning coal for energy production and has unburned carbon, which negatively affects its full potential use. The flotation technology can be effective in separating unburned carbon from CFA, and the prestirring time is crucial for the ideal initial conditions during the flotation process. To find the suitable prestirring time, eight prestirring times, including 0, 1, 2, 3, 4, 5, 6, and 7 min, were selected in this paper, followed by flotation of CFA after prestirring. Parameters such as loss on ignition (LOI), the removal rate of unburned carbon (RUC), contact angle, and particle size volume fraction were used to assess the effect of prestirring time on flotation results. The results showed that the prestirring time significantly affects the CFA flotation performance. As the prestirring time increased, the LOI of CFA first decreased and then increased, and the contact angle showed the opposite trend. Besides, the prestirring time of over 2 min positively affected the fineness of the tailings. Overall, the prestirring time of 3 min had the most significant carbon removal effect, obtaining an LOI of tailings of 0.96%, a yield of 74.56%, an RUC of 72.70%, and a volume fraction less than 45 μm of 36.65%. This study provides theoretical support for improving stirring efficiency and saving flotation costs in industrial applications and is conducive to the recycling of CFA resources.

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“…This causes difficulty for kerosene and diesel collectors to adsorb on the LRC surface during flotation, therefore, resulting in the large consumption of collectors. Improving collectors' adsorption degree on the LRC surface and dispersion degree in water [8,9] are of great significance to improve the flotation performance of LRC [10].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Multi-Collector on Long-Flame Coal Surface via Density Functional Theory Calculation and Molecular Dynamics Simulation

Cheng,

Peng,

et al. 2023

Processes

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The quantum chemical properties of long-flame coal (LFC) and collectors (kerosene, diesel, diethyl phthalate (DEP), biodiesel (BDC), and emulsified biodiesel (EBDC)) were analyzed via the density functional theory (DFT). The molecular dynamics (MD) of the coal–collector–water system and the adsorption of collectors on LFC were conducted based on the first principles. The results showed that the frontier molecular orbitals of kerosene, diesel, DEP, and BDC were 0.38 eV, 0.28 eV, 0.27 eV, and 0.20 eV, respectively. The chemical reactivity order of the abovementioned collectors was BDC > DEP > diesel > kerosene. Kerosene, diesel, and DEP adsorbed with carbonyl, hydroxyl, and carboxyl groups in LFC, respectively. Carboxyl groups in BDC and carboxyl groups in LFC bilaterally adsorbed, while BDC repelled water molecules via hydrogen bonds on the LFC surface. In the systems of BDC and EBDC, the diffusion coefficients of a water molecule were 2.83 × 10−4 cm2/s and 3.73 × 10−4 cm2/s. The emulsifier that adsorbed onto the oil–water interface of the coal–BDC–water system improved the dispersion of BDC during flotation, while at the same time increasing the number of hydrogen bonds between BDC and LFC, which accelerated the migration of water molecules from the LFC surface.

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Enhancing flotation removal of unburned carbon from fly ash by coal tar-based collector: Experiment and simulation

Cited by 15 publications

References 44 publications

Studies on Adsorption of Petroleum Products in Static Conditions

Studies on Adsorption of Petroleum Products in Static Conditions

Effect of Prestirring Time on Carbon Removal from Coal Fly Ash in the Flotation Technology

Adsorption of Multi-Collector on Long-Flame Coal Surface via Density Functional Theory Calculation and Molecular Dynamics Simulation

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