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Experimental investigate the influences of particle shape on density-induced segregation and dynamic properties in binary granular mixture in a rotating drum

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-01-25 DOI: 10.1016/j.powtec.2025.120696

Chun-Chung Liao, Zhe-Hao Zhang

In this study, the effect of particle shape on dynamic characteristics and density-induced segregation behaviors was investigated in quasi-two-dimensional rotating drums. The experimental results indicate that, as the rotation speed increases, the final steady-state segregation index decreases, while the average velocity, average granular temperature, and dynamic repose angle increase. Furthermore, when the filling level decreases, the granular flowing layer becomes thinner, resulting in a decrease in the final steady-state segregation index. The results demonstrate that particle shape has significant influences on density-induced granular segregation behavior and dynamic properties. When the granular system combines the effects of shape and density, the final steady-state segregation intensity no longer increases monotonically with the density ratio. The dynamic repose angle increases as cube-shaped particles are added to the granular mixture. Additionally, cube-shaped particles sink easily due to poor flowability, which influences the granular temperature in the binary granular mixture.

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引用次数: 0

Surface to bulk synergistic restructuring of ultrahigh nickel-rich LiNi0.96Co0.02Mn0.02O2 cathode for high-performance sulfide-based all-solid-state batteries

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-01-25 DOI: 10.1016/j.powtec.2025.120691

Kaiyuan Deng , Wenjin Li , Puxi An, Cheng Liu, Jiatao Wu, Rui Wang, Lei Yao, Guangliang Gary Liu

The all-solid-state lithium batteries (ASSLBs) based on sulfide solid electrolytes (SSE) and ultrahigh nickel-rich cathode (LiNi_xCo_yMn_1-x-yO₂, where x > 0.9) encounter challenges at the electrolyte-cathode interface, such as oxygen escape and side reactions in a highly delithiated state, resulting in significant structural deterioration and rapid capacity decay. In this study, a novel surface modification strategy that serves multiple functions is proposed to achieve in-situ formation of a Li₂MoO₄ coating layer and bulk doping with Mo element for enhancing the interface compatibility between LiNi_0.96Co_0.02Mn_0.02O₂ (NCM96) and Li₆PS₅Cl (LPSCl) electrolyte. Using thermodynamic/density functional theory calculations, X-ray photoelectron spectroscopy, and in-situ distribution of relaxation times analysis, it is revealed that the incorporated strong MoO bonds in NCM96 and the surficial fast-ionic conductor layer help to stabilize lattice oxygen, and preventing further electrochemical oxidation of the sulfide electrolyte and the formation of oxygenated sulfur and phosphorus species. It is demonstrated that ASSLBs with Mo modified NCM96 as the cathode and LPSCl as the solid electrolyte (SE) exhibit a high discharge capacity of 174.4 mAh g⁻¹ and an excellent cycle retention of 78 % after 200 charge/discharge cycles. This surface-to-bulk synergistic modification strategy provides a new perspective for the design of high-performance sulfide-based ASSLBs.

{"title":"Surface to bulk synergistic restructuring of ultrahigh nickel-rich LiNi0.96Co0.02Mn0.02O2 cathode for high-performance sulfide-based all-solid-state batteries","authors":"Kaiyuan Deng , Wenjin Li , Puxi An, Cheng Liu, Jiatao Wu, Rui Wang, Lei Yao, Guangliang Gary Liu","doi":"10.1016/j.powtec.2025.120691","DOIUrl":"10.1016/j.powtec.2025.120691","url":null,"abstract":"<div><div>The all-solid-state lithium batteries (ASSLBs) based on sulfide solid electrolytes (SSE) and ultrahigh nickel-rich cathode (LiNi<sub>x</sub>Co<sub>y</sub>Mn<sub>1-x-y</sub>O<sub>2</sub>, where x > 0.9) encounter challenges at the electrolyte-cathode interface, such as oxygen escape and side reactions in a highly delithiated state, resulting in significant structural deterioration and rapid capacity decay. In this study, a novel surface modification strategy that serves multiple functions is proposed to achieve in-situ formation of a Li<sub>2</sub>MoO<sub>4</sub> coating layer and bulk doping with Mo element for enhancing the interface compatibility between LiNi<sub>0.96</sub>Co<sub>0.02</sub>Mn<sub>0.02</sub>O<sub>2</sub> (NCM96) and Li<sub>6</sub>PS<sub>5</sub>Cl (LPSCl) electrolyte. Using thermodynamic/density functional theory calculations, X-ray photoelectron spectroscopy, and in-situ distribution of relaxation times analysis, it is revealed that the incorporated strong Mo<img>O bonds in NCM96 and the surficial fast-ionic conductor layer help to stabilize lattice oxygen, and preventing further electrochemical oxidation of the sulfide electrolyte and the formation of oxygenated sulfur and phosphorus species. It is demonstrated that ASSLBs with Mo modified NCM96 as the cathode and LPSCl as the solid electrolyte (SE) exhibit a high discharge capacity of 174.4 mAh g<sup>−1</sup> and an excellent cycle retention of 78 % after 200 charge/discharge cycles. This surface-to-bulk synergistic modification strategy provides a new perspective for the design of high-performance sulfide-based ASSLBs.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"454 ","pages":"Article 120691"},"PeriodicalIF":4.5,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application of computational fluid dynamics for calculating the solid circulation rate in a spout-fluid bed apparatus for dry coating

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-01-25 DOI: 10.1016/j.powtec.2025.120699

Wojciech Ludwig , Viraj Santosh Pawar

Computational fluid dynamics was applied to determine the solid circulation rate in a modified Wurster apparatus. Simulations were performed for various particle volumes and spouting gas flowrates. To check the influence of different geometrical parameters such as the diameter of the lower draft tube, entrainment length and deflectors distance to the upper draft tube, solid circulation rates were calculated for the same. In the last stage of the simulations, novel modifications were made to the modelled apparatus wherein a particular new deflector was conceptualized in order to intensify the solid circulation rate within the apparatus. The simulations help to calculate the solid circulation rate and to visualize particle movement for different conditions and in different regions of the apparatus. This model can further help to evaluate and implement modern design changes in devices with a fast circulating dilute spouted bed.

引用次数: 0

Spherical agglomeration for local control of electrode microstructure: Generation of structured agglomerates

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-01-24 DOI: 10.1016/j.powtec.2025.120688

Kunal Pardikar , Jediah Capindale , Kate Pitt , Igyaar Abdi-Rahman , Denis Cumming , Rachel Smith

In this work, the particle engineering technique Spherical Agglomeration is applied to Li-ion battery materials for the first time. This method involves the generation of structured agglomerates with great potential to act as building blocks of the electrode microstructure, providing control of electrode microstructure and homogeneity of component within the electrode. Process-property relationships are investigated by assessing the impact of varying operating parameters and material properties on agglomerate attributes. The ability to generate a variety of structured agglomerates is demonstrated for both carbon black agglomerates and co-agglomerates of active material and carbon black. These findings reveal that an optimal range of process parameters exists for obtaining spherical co−/agglomerates with good yield. Predictions of co−/agglomerate size are made using a previously published mathematical model, and good qualitative agreement between model and experiment is found, however the model consistently under-predicts co−/agglomerate size.

{"title":"Spherical agglomeration for local control of electrode microstructure: Generation of structured agglomerates","authors":"Kunal Pardikar , Jediah Capindale , Kate Pitt , Igyaar Abdi-Rahman , Denis Cumming , Rachel Smith","doi":"10.1016/j.powtec.2025.120688","DOIUrl":"10.1016/j.powtec.2025.120688","url":null,"abstract":"<div><div>In this work, the particle engineering technique Spherical Agglomeration is applied to Li-ion battery materials for the first time. This method involves the generation of structured agglomerates with great potential to act as building blocks of the electrode microstructure, providing control of electrode microstructure and homogeneity of component within the electrode. Process-property relationships are investigated by assessing the impact of varying operating parameters and material properties on agglomerate attributes. The ability to generate a variety of structured agglomerates is demonstrated for both carbon black agglomerates and co-agglomerates of active material and carbon black. These findings reveal that an optimal range of process parameters exists for obtaining spherical co−/agglomerates with good yield. Predictions of co−/agglomerate size are made using a previously published mathematical model, and good qualitative agreement between model and experiment is found, however the model consistently under-predicts co−/agglomerate size.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"454 ","pages":"Article 120688"},"PeriodicalIF":4.5,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Explosion mechanism of azobisisobutyronitrile doping with sodium bicarbonate modified dry water

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-01-23 DOI: 10.1016/j.powtec.2025.120692

Qinglun Bai, Wei Gao, Zhangqiang Dong, Ke Wang, Chenlu Xue, Zongling Zhang, Haipeng Jiang

Azobisisobutyronitrile (AIBN) plays a key role as a typical initiator or a foaming agent in the industries of plastics, pharmaceuticals and semiconductors. The autocatalytic property and high instability of AIBN make it risky to explode when subjected to heat. In this paper, the explosion characteristics and mechanism of AIBN dust were thoroughly investigated. During the explosion process, two carbon‑hydrogen bonds are broken and release N₂ leading to a rapid increase in explosion pressure. The optimum concentration of AIBN is 600 g/m³, at which time the P_max is 735.51 kPa and the (K_st)_max is 173.02 bar·m/s. In order to effectively inhibit the explosion of AIBN, SiO₂ and NaHCO₃ were selected as coating materials to develop a novel inhibitor modified sodium bicarbonate dry water powder (SBDW). When the concentration reached 400 g/m³, it was able to completely inhibit the explosion of AIBN. The kinetic model of AIBN/SBDW/air explosion reaction was constructed to reveal the key free radical mechanism of NaHCO₃ capturing AIBN combustion and explosion process. Considering the chemistry, inhibitors can hinder the combustion and explosion reaction of AIBN by despoiling H, O and OH. A novel insight into the characteristics and inhibition of AIBN dust explosion was provided, and is of great value for the safe application of azo compounds.

{"title":"Explosion mechanism of azobisisobutyronitrile doping with sodium bicarbonate modified dry water","authors":"Qinglun Bai, Wei Gao, Zhangqiang Dong, Ke Wang, Chenlu Xue, Zongling Zhang, Haipeng Jiang","doi":"10.1016/j.powtec.2025.120692","DOIUrl":"10.1016/j.powtec.2025.120692","url":null,"abstract":"<div><div>Azobisisobutyronitrile (AIBN) plays a key role as a typical initiator or a foaming agent in the industries of plastics, pharmaceuticals and semiconductors. The autocatalytic property and high instability of AIBN make it risky to explode when subjected to heat. In this paper, the explosion characteristics and mechanism of AIBN dust were thoroughly investigated. During the explosion process, two carbon‑hydrogen bonds are broken and release N<sub>2</sub> leading to a rapid increase in explosion pressure. The optimum concentration of AIBN is 600 g/m<sup>3</sup>, at which time the <em>P</em><sub>max</sub> is 735.51 kPa and the (<em>K</em><sub>st</sub>)<sub>max</sub> is 173.02 bar·m/s. In order to effectively inhibit the explosion of AIBN, SiO<sub>2</sub> and NaHCO<sub>3</sub> were selected as coating materials to develop a novel inhibitor modified sodium bicarbonate dry water powder (SBDW). When the concentration reached 400 g/m<sup>3</sup>, it was able to completely inhibit the explosion of AIBN. The kinetic model of AIBN/SBDW/air explosion reaction was constructed to reveal the key free radical mechanism of NaHCO<sub>3</sub> capturing AIBN combustion and explosion process. Considering the chemistry, inhibitors can hinder the combustion and explosion reaction of AIBN by despoiling H, O and OH. A novel insight into the characteristics and inhibition of AIBN dust explosion was provided, and is of great value for the safe application of azo compounds.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"454 ","pages":"Article 120692"},"PeriodicalIF":4.5,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Probing oscillatory pressure sintering mechanisms and mechanical properties of Ti6Al4V alloys via MD simulation

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-01-23 DOI: 10.1016/j.powtec.2025.120695

Pengfei Wu , Tie Wei , Wei Zhang , Jiarui Wei , Qihang Zhou , Zedong Lin , Mabao Liu

This study investigates the coalescence kinetics of Ti6Al4V alloy under oscillatory pressure using a multi-particle model based on molecular dynamics. The results indicate that oscillatory pressure promotes a more uniform distribution of force on particles, resulting in Ti6Al4V samples with smaller grain sizes and more uniform phase distribution. The oscillatory pressure facilitates relative rotation and displacement between particles, aiding surface diffusion and particle bonding, thus accelerating the sintering process and enhancing the densification of Ti6Al4V alloy. Ti6Al4V samples processed with oscillatory pressure exhibit finer and more uniform microstructures, leading to an increased density of stronger grain boundaries and higher dislocation densities, thereby improving strength by impeding dislocation movement. Furthermore, the stronger grain boundaries and the presence of a greater amount of β-phase, distributed more uniformly in the Ti6Al4V samples processed with oscillatory pressure, enhance the alloy's plasticity. Overall, oscillatory pressure sintering significantly influences the mechanical properties of Ti6Al4V, suggesting the potential of the oscillatory pressure sintering method over conventional hot pressing in enhancing material performance.

{"title":"Probing oscillatory pressure sintering mechanisms and mechanical properties of Ti6Al4V alloys via MD simulation","authors":"Pengfei Wu , Tie Wei , Wei Zhang , Jiarui Wei , Qihang Zhou , Zedong Lin , Mabao Liu","doi":"10.1016/j.powtec.2025.120695","DOIUrl":"10.1016/j.powtec.2025.120695","url":null,"abstract":"<div><div>This study investigates the coalescence kinetics of Ti6Al4V alloy under oscillatory pressure using a multi-particle model based on molecular dynamics. The results indicate that oscillatory pressure promotes a more uniform distribution of force on particles, resulting in Ti6Al4V samples with smaller grain sizes and more uniform phase distribution. The oscillatory pressure facilitates relative rotation and displacement between particles, aiding surface diffusion and particle bonding, thus accelerating the sintering process and enhancing the densification of Ti6Al4V alloy. Ti6Al4V samples processed with oscillatory pressure exhibit finer and more uniform microstructures, leading to an increased density of stronger grain boundaries and higher dislocation densities, thereby improving strength by impeding dislocation movement. Furthermore, the stronger grain boundaries and the presence of a greater amount of β-phase, distributed more uniformly in the Ti6Al4V samples processed with oscillatory pressure, enhance the alloy's plasticity. Overall, oscillatory pressure sintering significantly influences the mechanical properties of Ti6Al4V, suggesting the potential of the oscillatory pressure sintering method over conventional hot pressing in enhancing material performance.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"454 ","pages":"Article 120695"},"PeriodicalIF":4.5,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Advancements in 2D nanomaterial-enhanced nanofluids: Stability, thermophysical properties, and industrial applications

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-01-22 DOI: 10.1016/j.powtec.2025.120687

Behzad Heidarshenas , Yanjie Yuan , A.S. El-Shafay

The incorporation of two-dimensional nanomaterials into nanofluids has attracted considerable interest because of their great potential to improve the thermal properties of different applications. This review briefly looks at the progress made in the incorporation of 2D nanomaterials into nanofluids based on preparation, stability, thermophysical properties, and utility. The review also discusses the better thermal characteristics of 2D nanomaterial, enhanced thermal conductivity, viscosity, and heat transfer coefficient of nanofluid compared to baseline fluid. The applications of 2D nanomaterial-based nanofluids are found in heat exchangers, solar energy systems, automotive cooling, and the cooling of electronic devices, all of which contribute to enhanced efficiency and environmental sustainability. Furthermore, the topic of the present review also includes the comparison of the performance of nanofluids incorporated with 2D nanomaterials. The review looks into the economic and environmental valuations arguing that there could be some form of cost reduction and environmental gains.

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引用次数: 0

Investigation of multi-field coupling performance in a binary-mixture fluidized bed reactor for FCC-PDH coupling process: Effects of key process parameters

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-01-22 DOI: 10.1016/j.powtec.2025.120671

Chen Song , Jiayu Dong , Xiufeng Gao , Simin Wang , Jian Wen , Yun Li

The multi-field coupling performance of a binary-mixture fluidized bed reactor was investigated for the novel FCC-PDH coupling process, focusing on key process parameters. A validated numerical model demonstrated deviations within ±10 % for flow and reaction simulations. Results revealed favorable temperature profiles and reaction equilibrium, with a 113.15 K reduction in catalyst circulation temperature under an initial packing temperature of 773 K and a regeneration temperature of 873 K. This reduction optimized FCC reaction conditions by lowering the oil-catalyst contact temperature. Propane conversion exceeded 70 %, with a distinct “secondary plateau period” observed in axial reaction intensity, highlighting the interplay between heat transfer and reaction kinetics. Increasing the catalyst packing temperature from 773 K to 873 K reduced the thermal equilibrium height from 3200 mm to 2500 mm and boosted propane conversion from 80.11 % to 99.51 %, despite a decrease in the temperature drop of the circulating catalyst from 195.1 K to 89.9 K. Lower regeneration temperatures improved temperature uniformity and reduced catalyst temperature drops. At a flotsam packing ratio of 0.28, the optimal conversion of 81.63 % was achieved, ensuring efficient mixing and continuous endothermic dehydrogenation. These findings provide valuable insights for optimizing FCC-PDH industrial designs, emphasizing the importance of parameter tuning to enhance process performance and energy efficiency.

{"title":"Investigation of multi-field coupling performance in a binary-mixture fluidized bed reactor for FCC-PDH coupling process: Effects of key process parameters","authors":"Chen Song , Jiayu Dong , Xiufeng Gao , Simin Wang , Jian Wen , Yun Li","doi":"10.1016/j.powtec.2025.120671","DOIUrl":"10.1016/j.powtec.2025.120671","url":null,"abstract":"<div><div>The multi-field coupling performance of a binary-mixture fluidized bed reactor was investigated for the novel FCC-PDH coupling process, focusing on key process parameters. A validated numerical model demonstrated deviations within ±10 % for flow and reaction simulations. Results revealed favorable temperature profiles and reaction equilibrium, with a 113.15 K reduction in catalyst circulation temperature under an initial packing temperature of 773 K and a regeneration temperature of 873 K. This reduction optimized FCC reaction conditions by lowering the oil-catalyst contact temperature. Propane conversion exceeded 70 %, with a distinct “secondary plateau period” observed in axial reaction intensity, highlighting the interplay between heat transfer and reaction kinetics. Increasing the catalyst packing temperature from 773 K to 873 K reduced the thermal equilibrium height from 3200 mm to 2500 mm and boosted propane conversion from 80.11 % to 99.51 %, despite a decrease in the temperature drop of the circulating catalyst from 195.1 K to 89.9 K. Lower regeneration temperatures improved temperature uniformity and reduced catalyst temperature drops. At a flotsam packing ratio of 0.28, the optimal conversion of 81.63 % was achieved, ensuring efficient mixing and continuous endothermic dehydrogenation. These findings provide valuable insights for optimizing FCC-PDH industrial designs, emphasizing the importance of parameter tuning to enhance process performance and energy efficiency.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"454 ","pages":"Article 120671"},"PeriodicalIF":4.5,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental investigation and prediction model development for the minimum explosion concentration of tungsten dust in hydrogen environments

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-01-22 DOI: 10.1016/j.powtec.2025.120685

Xi Chen , Xiaozhe Yu , Zhenhua Zhang , Xingqing Yan , Lei Chen , Jianliang Yu

The minimum explosion concentrations (MEC) of micrometer-size tungsten dust were measured in hydrogen environments with variable initial ignition energies. The results show that tungsten dust below the MEC will still explode mixed with hydrogen below the lower explosion limit (LEL) when the ignition energy is high enough, suggesting an interaction between the ignition energy and the concentration of the gaseous fuel. There is a discontinuity between the MEC curve of tungsten dust in hydrogen and the LEL point of hydrogen, which can not be explained by the ignition theory of volatile dust. On the basis of these phenomena, the ignition mechanism for the hybrid mixture of low-volatile dust/gaseous fuels was established, and a prediction model for the MEC of low-volatile dust in gaseous fuel environments was constructed. The work can provide essential parameters for explosion protection and theoretical support for dust process safety.

引用次数: 0

Carbon removal performance and economic analysis of waste fried oil for coal fly ash flotation

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-01-22 DOI: 10.1016/j.powtec.2025.120658

Ke Liu , Ying Zhang , Jinming Jiang , Koji Takasu , Weijun Gao

Petrochemical-based collectors are costly and non-renewable, so it is crucial to find a new kind of environmentally friendly and efficient collector. In this paper, waste fried oil (WFO) and kerosene were selected as collectors, and their flotation performances for high‑carbon content fly ash (HCFA) and low-carbon content fly ash (LCFA) were compared. The results revealed that the main compounds in WFO had carbon chain lengths ranging from C₁₈-C₃₀, which had stronger hydrophobicity. The numerous oxygen-containing groups in WFO could bond with the hydrophilic sites on unburned carbon, facilitating WFO adsorption and increasing the surface hydrophobicity of the unburned carbon. By increasing the WFO dosage from 0 to 3.25 kg/t, the contact angles of HCFA and LCFA increased by 153 % and 86 %, respectively. When the WFO dosage was 3.25 kg/t, the floatation of HCFA and LCFA produced tailings with loss on ignition of 5.37 % and 0.75 %, meeting GB Class II and GB Class I fly ash standards, respectively. Additionally, the recovery of unburned carbon improved by 21.42 % and 15.15 %. Furthermore, compared to kerosene, using WFO for the flotation of 1 t of HCFA and LCFA generated an extra profit of 10.29 USD and 4.61 USD. WFO demonstrated greater flotation efficiency and economic advantages over kerosene in the treatment of HCFA and LCFA, suggesting significant potential for industrial applications.

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