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Selective depression of copper-activated pyrite by oxalic acid: Implications for enhanced chalcopyrite–pyrite separation

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-01-22 DOI: 10.1016/j.powtec.2025.120681

Gde Pandhe Wisnu Suyantara , Akbarshokh Ulmaszoda , Hajime Miki , Doaa Ashraf Eladl , Keiko Sasaki , Naoko Okibe

The selective separation of pyrite (FeS₂) and chalcopyrite (CuFeS₂) in flotation processes poses significant challenges due to the activation of the pyrite surfaces by copper ions dissolved from associated copper sulfide minerals. This study proposes oxalic acid as an environment-friendly reagent to inhibit the copper-induced activation of pyrite. Chalcopyrite was used as a model mineral to evaluate the selectivity of oxalic acid treatment. The flotation experiments demonstrated that oxalic acid reduced the flotation recovery of copper-activated pyrite from 58 % to 16 % at pH 9 while exerting no discernible effect on chalcopyrite flotation. Further tests using artificial mixtures of chalcopyrite and pyrite confirmed the ability of oxalic acid to selectively separate chalcopyrite from copper-activated pyrite under mildly alkaline conditions, improving the separation efficiency from 30 % to 78 % with the addition of 15 kg/t (0.55 mM) oxalic acid at pH 9. The mechanism underlying this selectivity was investigated using infrared spectroscopy, X-ray photoelectron spectroscopy, and atomic force microscopy. The results revealed that oxalic acid reacts with copper ions to form copper oxalate, which effectively prevents copper deposition on the pyrite surface. This reaction inhibits pyrite activation and suppresses the adsorption of xanthate collectors. These findings highlight the potential of oxalic acid as a sustainable reagent for enhancing the selectivity and efficiency of chalcopyrite–pyrite separation in flotation processes.

{"title":"Selective depression of copper-activated pyrite by oxalic acid: Implications for enhanced chalcopyrite–pyrite separation","authors":"Gde Pandhe Wisnu Suyantara , Akbarshokh Ulmaszoda , Hajime Miki , Doaa Ashraf Eladl , Keiko Sasaki , Naoko Okibe","doi":"10.1016/j.powtec.2025.120681","DOIUrl":"10.1016/j.powtec.2025.120681","url":null,"abstract":"<div><div>The selective separation of pyrite (FeS<sub>2</sub>) and chalcopyrite (CuFeS<sub>2</sub>) in flotation processes poses significant challenges due to the activation of the pyrite surfaces by copper ions dissolved from associated copper sulfide minerals. This study proposes oxalic acid as an environment-friendly reagent to inhibit the copper-induced activation of pyrite. Chalcopyrite was used as a model mineral to evaluate the selectivity of oxalic acid treatment. The flotation experiments demonstrated that oxalic acid reduced the flotation recovery of copper-activated pyrite from 58 % to 16 % at pH 9 while exerting no discernible effect on chalcopyrite flotation. Further tests using artificial mixtures of chalcopyrite and pyrite confirmed the ability of oxalic acid to selectively separate chalcopyrite from copper-activated pyrite under mildly alkaline conditions, improving the separation efficiency from 30 % to 78 % with the addition of 15 kg/t (0.55 mM) oxalic acid at pH 9. The mechanism underlying this selectivity was investigated using infrared spectroscopy, X-ray photoelectron spectroscopy, and atomic force microscopy. The results revealed that oxalic acid reacts with copper ions to form copper oxalate, which effectively prevents copper deposition on the pyrite surface. This reaction inhibits pyrite activation and suppresses the adsorption of xanthate collectors. These findings highlight the potential of oxalic acid as a sustainable reagent for enhancing the selectivity and efficiency of chalcopyrite–pyrite separation in flotation processes.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"454 ","pages":"Article 120681"},"PeriodicalIF":4.5,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104243","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

Effect of abrasive mass flow rate on energy efficiency in low-pressure supersonic abrasive air jet rock-slitting

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-01-21 DOI: 10.1016/j.powtec.2025.120672

Jianping Wei , Yi Huang , Changjiang Chen , Dayang Yu , Dezhong Kong , Junhao Zhu , Yong Liu

The low-pressure supersonic abrasive air jet (AAJ) effectively addresses high containment pressures and hard rock. The energy distribution of the AAJ during travel rock-slitting is primarily influenced by the abrasive mass flow rate, which significantly impacts cutting efficiency. A CFD-DEM model was used to analyze the effects of nozzle travel speed and abrasive mass flow rate on particle velocity and energy distribution. Results indicate that under a constant nozzle travel speed, the impact kinetic energy varies with changes in the abrasive mass flow rate. The increase in abrasive mass flow rate enhances the energy of rock, but an upper limit exists. As nozzle travel speed increases, the optimal mass flow rate also rises. However, higher nozzle speeds reduce cutting efficiency due to shorter jet-rock contact time. Thus, selecting the optimal mass flow rate at lower nozzle speeds is an economical strategy for maximizing rock-breaking performance.

引用次数: 0

Investigation of the effective diffusion coefficient of nitrogen gas using high-resolution 3D X-ray computed tomography images of nuclear-grade graphite IG-110

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-01-18 DOI: 10.1016/j.powtec.2025.120664

Lei Peng , Yixiong Lin , Huang Zhang , Wei Zheng , Bin Du , Penghui Xiao , Huaqiang Yin , Xuedong He , Tao Ma

Nuclear-grade graphite IG-110, an isotropic fine-grained solid material, is widely studied for its applications in high-temperature gas-cooled reactors (HTGRs). Gas diffusion is a crucial parameter in understanding mass transport phenomena in nuclear graphite during the dehumidification and operational processes of HTGRs. Despite the importance of gas diffusion modeling, limited numerical frameworks have been developed to predict diffusion coefficients within the microstructure of nuclear-grade graphite. In this study, geometric models of nuclear graphite were obtained using X-ray computed tomography, and the dimensionless diffusivity of nitrogen was calculated using the lattice Boltzmann method (LBM) and electrical conduction simulations. The computational model was validated against experimental data, showing a close alignment between the numerical approach and the experimental results. Additionally, the experiment found that gas diffusion within nuclear graphite logically decreases with increasing gas pressure and remains unaffected by confining pressure. These theoretical findings are useful for understanding water transport in nuclear graphite during the dehumidification process.

{"title":"Investigation of the effective diffusion coefficient of nitrogen gas using high-resolution 3D X-ray computed tomography images of nuclear-grade graphite IG-110","authors":"Lei Peng , Yixiong Lin , Huang Zhang , Wei Zheng , Bin Du , Penghui Xiao , Huaqiang Yin , Xuedong He , Tao Ma","doi":"10.1016/j.powtec.2025.120664","DOIUrl":"10.1016/j.powtec.2025.120664","url":null,"abstract":"<div><div>Nuclear-grade graphite IG-110, an isotropic fine-grained solid material, is widely studied for its applications in high-temperature gas-cooled reactors (HTGRs). Gas diffusion is a crucial parameter in understanding mass transport phenomena in nuclear graphite during the dehumidification and operational processes of HTGRs. Despite the importance of gas diffusion modeling, limited numerical frameworks have been developed to predict diffusion coefficients within the microstructure of nuclear-grade graphite. In this study, geometric models of nuclear graphite were obtained using X-ray computed tomography, and the dimensionless diffusivity of nitrogen was calculated using the lattice Boltzmann method (LBM) and electrical conduction simulations. The computational model was validated against experimental data, showing a close alignment between the numerical approach and the experimental results. Additionally, the experiment found that gas diffusion within nuclear graphite logically decreases with increasing gas pressure and remains unaffected by confining pressure. These theoretical findings are useful for understanding water transport in nuclear graphite during the dehumidification process.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"454 ","pages":"Article 120664"},"PeriodicalIF":4.5,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104245","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

Enhanced effect of nanobubbles on surface hydrophobicity and particle agglomeration for ultraclean coal preparation

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-01-16 DOI: 10.1016/j.powtec.2025.120655

Xiaowei Deng , Le Chen , Jinwen Wu , Guolong Zhong , Yao Zhang , Yunlai Chen , Chaojun Fang , Gen Huang , Hongxiang Xu

Coal plays a pivotal role in global energy consumption, with ultraclean coal preparation representing a key strategy for enhancing coal utilization. Currently, traditional flotation processes used for ultraclean coal preparation face certain limitations. This study explores the preparation of ultraclean coal by leveraging nanobubbles to enhance surface hydrophobicity and particle agglomeration. Using nanobubbles, ultraclean coal with an ash content of 2.58 % and a yield of 16.60 % was prepared, accompanied by a 40 % reduction in collector dosage. X-ray photoelectron spectroscopy and contact angle analyses reveal that nanobubbles improve coal surface hydrophobicity, facilitating the separation of coal and minerals. Particle size analysis, microscopy, and zeta potential measurements reveal that nanobubbles promote particle agglomeration, enhance collision frequency between coal and bubbles, and minimize chemical reagent consumption. Particle-pubble collision and adhesion studies indicate that nanobubbles reduce the hydration shell thickness on the coal surface and shorten the induction time, promoting bubble mineralization. Flotation kinetics and Fuerstenau curves confirm the enhanced effects of nanobubbles on combustible recovery, flotation rates, and separation efficiency. These findings offer valuable insights into ultraclean coal preparation while achieving cost reductions.

{"title":"Enhanced effect of nanobubbles on surface hydrophobicity and particle agglomeration for ultraclean coal preparation","authors":"Xiaowei Deng , Le Chen , Jinwen Wu , Guolong Zhong , Yao Zhang , Yunlai Chen , Chaojun Fang , Gen Huang , Hongxiang Xu","doi":"10.1016/j.powtec.2025.120655","DOIUrl":"10.1016/j.powtec.2025.120655","url":null,"abstract":"<div><div>Coal plays a pivotal role in global energy consumption, with ultraclean coal preparation representing a key strategy for enhancing coal utilization. Currently, traditional flotation processes used for ultraclean coal preparation face certain limitations. This study explores the preparation of ultraclean coal by leveraging nanobubbles to enhance surface hydrophobicity and particle agglomeration. Using nanobubbles, ultraclean coal with an ash content of 2.58 % and a yield of 16.60 % was prepared, accompanied by a 40 % reduction in collector dosage. X-ray photoelectron spectroscopy and contact angle analyses reveal that nanobubbles improve coal surface hydrophobicity, facilitating the separation of coal and minerals. Particle size analysis, microscopy, and zeta potential measurements reveal that nanobubbles promote particle agglomeration, enhance collision frequency between coal and bubbles, and minimize chemical reagent consumption. Particle-pubble collision and adhesion studies indicate that nanobubbles reduce the hydration shell thickness on the coal surface and shorten the induction time, promoting bubble mineralization. Flotation kinetics and Fuerstenau curves confirm the enhanced effects of nanobubbles on combustible recovery, flotation rates, and separation efficiency. These findings offer valuable insights into ultraclean coal preparation while achieving cost reductions.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120655"},"PeriodicalIF":4.5,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100458","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

Fragment tracking for microparticle breakage resulting from high-speed impacts

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-01-16 DOI: 10.1016/j.powtec.2025.120657

Brandon J. Weindorf , Matthew Morrison , K. Todd Lowe , Wing Ng , Jim Loebig

Particle breakage is of great interest within multiple engineering disciplines, as applications exist in powder production, industrial pipe flow, and aircraft engines. While important, not many measurement techniques exist to directly measure particle breakage. This work introduces an image-based measurement technique and algorithm that detects breakage and tracks resulting fragments for high-speed particles. This allows for the breakage probability (or selection function) to be measured directly by comparing the number of particles that bounce to the number of particles that break for a given impact condition. The presented algorithm is also shown to have an uncertainty of no more than

\pm 6 %

. Moreover, resulting fragment velocities and angles are related to initial impact conditions and compared with corresponding particle bounce results. The breakage algorithm is demonstrated on experimental data consisting of

150 μm - 250 μm

sieved quartz incident on Grade 4 (commercially pure) titanium with speeds between

60 m / s

and

100 m / s

and a nominal angle of incidence of

30^{°}

. It is demonstrated that the technique yields good results as groups of fragments resulting from particle breakage are shown to have the same average rebounding angle and a lower average rebounding velocity compared to particles that bounce. These findings underscore the improved particle breakage measurements that this new technique achieves.

{"title":"Fragment tracking for microparticle breakage resulting from high-speed impacts","authors":"Brandon J. Weindorf , Matthew Morrison , K. Todd Lowe , Wing Ng , Jim Loebig","doi":"10.1016/j.powtec.2025.120657","DOIUrl":"10.1016/j.powtec.2025.120657","url":null,"abstract":"<div><div>Particle breakage is of great interest within multiple engineering disciplines, as applications exist in powder production, industrial pipe flow, and aircraft engines. While important, not many measurement techniques exist to directly measure particle breakage. This work introduces an image-based measurement technique and algorithm that detects breakage and tracks resulting fragments for high-speed particles. This allows for the breakage probability (or selection function) to be measured directly by comparing the number of particles that bounce to the number of particles that break for a given impact condition. The presented algorithm is also shown to have an uncertainty of no more than <span><math><mo>±</mo><mn>6</mn><mo>%</mo></math></span>. Moreover, resulting fragment velocities and angles are related to initial impact conditions and compared with corresponding particle bounce results. The breakage algorithm is demonstrated on experimental data consisting of <span><math><mn>150</mn><mspace></mspace><mi>μm</mi><mo>−</mo><mn>250</mn><mspace></mspace><mi>μm</mi></math></span> sieved quartz incident on Grade 4 (commercially pure) titanium with speeds between <span><math><mn>60</mn><mspace></mspace><mi>m</mi><mo>/</mo><mi>s</mi></math></span> and <span><math><mn>100</mn><mspace></mspace><mi>m</mi><mo>/</mo><mi>s</mi></math></span> and a nominal angle of incidence of <span><math><msup><mn>30</mn><mo>°</mo></msup></math></span>. It is demonstrated that the technique yields good results as groups of fragments resulting from particle breakage are shown to have the same average rebounding angle and a lower average rebounding velocity compared to particles that bounce. These findings underscore the improved particle breakage measurements that this new technique achieves.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120657"},"PeriodicalIF":4.5,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100798","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

Discharge electrode shape optimization for the performance improvement of electrostatic precipitator with six-branched spike discharge electrode and hexagonal collecting plate

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-01-15 DOI: 10.1016/j.powtec.2025.120662

Seok-Ju Hwang , Gi-Hyuk Lee , Hak-Joon Kim , Se-Jin Yook

Although various studies have explored improving electrostatic precipitator efficiency and discharge electrode shapes, optimization considering multiple shape variables simultaneously has not yet been extensively performed. In this study, a hexagonal collecting plate was used in a honeycomb-type electrostatic precipitator, and the effects of shape variables of a six-branched spike discharge electrode on collection efficiency were examined. A total of 42 discharge electrode shapes were selected based on the range of shape variables, and the optimal discharge electrode shape was determined by analyzing the collection efficiency of the electrostatic precipitator based on discharge electrode shape variables through numerical analysis. The collection efficiency increased with an increase in the length of the discharge electrode wires and a decrease in the interval between the wires in the flow direction. Further, the collection efficiency decreased with an increase in the flow rate of the aerosol because the particle residence time decreased. Experiments were conducted by preparing the discharge electrode shapes before and after optimization; the collection efficiency obtained through the numerical analysis was in good agreement with that of the experiment. Although the collection efficiency of the electrostatic precipitator was increased by approximately 20 % by optimizing the discharge electrode shape, the amount of power consumption and ozone generated were almost identical before and after optimization. The results of this study indicate that the optimization of various discharge electrode shapes is beneficial for significantly improving the performance of electrostatic precipitators while maintaining power consumption and ozone generation, potentially improving energy efficiency and reducing operational costs.

{"title":"Discharge electrode shape optimization for the performance improvement of electrostatic precipitator with six-branched spike discharge electrode and hexagonal collecting plate","authors":"Seok-Ju Hwang , Gi-Hyuk Lee , Hak-Joon Kim , Se-Jin Yook","doi":"10.1016/j.powtec.2025.120662","DOIUrl":"10.1016/j.powtec.2025.120662","url":null,"abstract":"<div><div>Although various studies have explored improving electrostatic precipitator efficiency and discharge electrode shapes, optimization considering multiple shape variables simultaneously has not yet been extensively performed. In this study, a hexagonal collecting plate was used in a honeycomb-type electrostatic precipitator, and the effects of shape variables of a six-branched spike discharge electrode on collection efficiency were examined. A total of 42 discharge electrode shapes were selected based on the range of shape variables, and the optimal discharge electrode shape was determined by analyzing the collection efficiency of the electrostatic precipitator based on discharge electrode shape variables through numerical analysis. The collection efficiency increased with an increase in the length of the discharge electrode wires and a decrease in the interval between the wires in the flow direction. Further, the collection efficiency decreased with an increase in the flow rate of the aerosol because the particle residence time decreased. Experiments were conducted by preparing the discharge electrode shapes before and after optimization; the collection efficiency obtained through the numerical analysis was in good agreement with that of the experiment. Although the collection efficiency of the electrostatic precipitator was increased by approximately 20 % by optimizing the discharge electrode shape, the amount of power consumption and ozone generated were almost identical before and after optimization. The results of this study indicate that the optimization of various discharge electrode shapes is beneficial for significantly improving the performance of electrostatic precipitators while maintaining power consumption and ozone generation, potentially improving energy efficiency and reducing operational costs.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120662"},"PeriodicalIF":4.5,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100457","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

Spherical agglomerates of alpha lipoic acid: The preparation process, formation mechanism and properties optimization

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-01-15 DOI: 10.1016/j.powtec.2025.120666

Yizhen Bian, Qinglin Wang, Xueya Zhang, Ming-Hui Qi, Bin Zhu, Guo-Bin Ren, Minghuang Hong

As one of the most commonly used natural compounds, Alpha lipoic acid (ALA) faces challenges in pharmaceutical process due to its poor bulk density and flowability. In this work, ALA was prepared into spherical agglomerates by quasi-emulsion solvent diffusion method and showed improved micromeritic properties. Through in-situ monitoring and molecular dynamic simulation, the formation of ALA spherical agglomerates was proved to be driven by the outward diffusion of the internal organic phase, which belongs to the “solid sphere” model. It was found that the particle size of the spherical agglomerates could be reduced by the addition of polyvinylpyrrolidone K30 (PVP K30) to stabilize the emulsion, while the increasing concentration (from 0.25 % to 10.00 %) increased the particle size (from 164 to 350 nm) by reducing interfacial tension. The spherical agglomeration of ALA met the requirements for direct compression, and the study of the formation mechanism and process control will be beneficial for the design of other spherical agglomerates.

{"title":"Spherical agglomerates of alpha lipoic acid: The preparation process, formation mechanism and properties optimization","authors":"Yizhen Bian, Qinglin Wang, Xueya Zhang, Ming-Hui Qi, Bin Zhu, Guo-Bin Ren, Minghuang Hong","doi":"10.1016/j.powtec.2025.120666","DOIUrl":"10.1016/j.powtec.2025.120666","url":null,"abstract":"<div><div>As one of the most commonly used natural compounds, Alpha lipoic acid (ALA) faces challenges in pharmaceutical process due to its poor bulk density and flowability. In this work, ALA was prepared into spherical agglomerates by quasi-emulsion solvent diffusion method and showed improved micromeritic properties. Through in-situ monitoring and molecular dynamic simulation, the formation of ALA spherical agglomerates was proved to be driven by the outward diffusion of the internal organic phase, which belongs to the “solid sphere” model. It was found that the particle size of the spherical agglomerates could be reduced by the addition of polyvinylpyrrolidone K30 (PVP K30) to stabilize the emulsion, while the increasing concentration (from 0.25 % to 10.00 %) increased the particle size (from 164 to 350 nm) by reducing interfacial tension. The spherical agglomeration of ALA met the requirements for direct compression, and the study of the formation mechanism and process control will be beneficial for the design of other spherical agglomerates.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120666"},"PeriodicalIF":4.5,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100460","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

Influence of multiple factors on the atomization and dust reduction characteristics of internal mixing pneumatic atomization nozzles

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-01-11 DOI: 10.1016/j.powtec.2024.120591

Linquan Tong , Yuhao Guo , Xin Jia , Tian Zhang , Zhen Zhang , Jianguo Liu

To investigate the spray and dust reduction characteristics of internal mixing pneumatic atomizers, experiments were conducted using a self-developed atomization angle and droplet size testing platform, along with a dust-fog coupling experimental platform. The results showed that under pneumatic pressures of 0.2–0.4 MPa and water flow rates of 10-16 L/h, the volume median diameter (V₅₀) and Sauter mean diameter (SMD) of the internal mixing pneumatic atomization droplets decreased with increasing pneumatic pressure and increased with rising water flow rates, with pneumatic pressure having a greater effect. At dust movement speeds of 1–3 m/s and aerosol velocities of 2-5 m/s and 5-11 m/s, the highest dust reduction efficiency occurred at droplet sizes of 40-50 μm and 30-40 μm, respectively. Setting the aerosol velocity to 8-11 m/s and the dust velocity to 1 m/s, with the droplet size (SMD) evenly distributed between 20‐ and 40 μm, resulted in effective coupling and settling with dust particles ranging from 0 to 50 μm, achieving the highest dust reduction efficiency. This study offers theoretical and experimental support for the use of internal mixing pneumatic atomization in dust control.

{"title":"Influence of multiple factors on the atomization and dust reduction characteristics of internal mixing pneumatic atomization nozzles","authors":"Linquan Tong , Yuhao Guo , Xin Jia , Tian Zhang , Zhen Zhang , Jianguo Liu","doi":"10.1016/j.powtec.2024.120591","DOIUrl":"10.1016/j.powtec.2024.120591","url":null,"abstract":"<div><div>To investigate the spray and dust reduction characteristics of internal mixing pneumatic atomizers, experiments were conducted using a self-developed atomization angle and droplet size testing platform, along with a dust-fog coupling experimental platform. The results showed that under pneumatic pressures of 0.2–0.4 MPa and water flow rates of 10-16 L/h, the volume median diameter (<em>V</em><sub>50</sub>) and Sauter mean diameter (SMD) of the internal mixing pneumatic atomization droplets decreased with increasing pneumatic pressure and increased with rising water flow rates, with pneumatic pressure having a greater effect. At dust movement speeds of 1–3 m/s and aerosol velocities of 2-5 m/s and 5-11 m/s, the highest dust reduction efficiency occurred at droplet sizes of 40-50 μm and 30-40 μm, respectively. Setting the aerosol velocity to 8-11 m/s and the dust velocity to 1 m/s, with the droplet size (SMD) evenly distributed between 20‐ and 40 μm, resulted in effective coupling and settling with dust particles ranging from 0 to 50 μm, achieving the highest dust reduction efficiency. This study offers theoretical and experimental support for the use of internal mixing pneumatic atomization in dust control.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120591"},"PeriodicalIF":4.5,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100461","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

Light extinction and scattering to determine nanoparticle formation rates during droplet jetting in aluminum dust flames

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-01-11 DOI: 10.1016/j.powtec.2025.120633

Niklas Jüngst, Zhiyong Wu, Can Ruan, Marcus Aldén, Zhongshan Li

The combustion of aluminum powder enables a CO₂-free generation of heat and electricity. To understand the asymmetric combustion of burning aluminum particles, we imaged light extinction and scattering with high speed and magnification. In the flame, particles melt, ignite, and build up a spherical flame sheet of condensed-phase alumina around the droplet. Shortly thereafter, the asymmetric stage occurs where the flame locally extinguishes, the droplet accelerates, i.e., droplet jetting, and leaves behind a condensation trail of alumina particles. Two alternately pulsed LEDs were used to image light extinction and scattering in the condensation trail at 200000 frames per second. This yields quasi-simultaneous images of transmission and scattered light. The geometry of the light-scattering experiment and Mie theory yield the collection efficiency of scattered light as a function of the particle size. An iterative calculation of the collection efficiency and the single-scattering albedo, the ratio of scattering and extinction, converges and yields the particle diameter in the Rayleigh regime. The correction for total scattered-light in the extinction yields the absorbance from which the nanoparticle volume is derived. Nanoparticles appear at the onset of the trails near the droplet and grow along the trail from around 40 nm to 110 nm until they are outside the Rayleigh regime. The nanoparticle formation rate is 50 % of the total alumina formation rate during the symmetric phase. The large occurrence frequency of droplet jetting makes it an important contribution to nanoparticle formation and to the total heat release in aluminum combustion.

{"title":"Light extinction and scattering to determine nanoparticle formation rates during droplet jetting in aluminum dust flames","authors":"Niklas Jüngst, Zhiyong Wu, Can Ruan, Marcus Aldén, Zhongshan Li","doi":"10.1016/j.powtec.2025.120633","DOIUrl":"10.1016/j.powtec.2025.120633","url":null,"abstract":"<div><div>The combustion of aluminum powder enables a CO<sub>2</sub>-free generation of heat and electricity. To understand the asymmetric combustion of burning aluminum particles, we imaged light extinction and scattering with high speed and magnification. In the flame, particles melt, ignite, and build up a spherical flame sheet of condensed-phase alumina around the droplet. Shortly thereafter, the asymmetric stage occurs where the flame locally extinguishes, the droplet accelerates, i.e., droplet jetting, and leaves behind a condensation trail of alumina particles. Two alternately pulsed LEDs were used to image light extinction and scattering in the condensation trail at 200000 frames per second. This yields quasi-simultaneous images of transmission and scattered light. The geometry of the light-scattering experiment and Mie theory yield the collection efficiency of scattered light as a function of the particle size. An iterative calculation of the collection efficiency and the single-scattering albedo, the ratio of scattering and extinction, converges and yields the particle diameter in the Rayleigh regime. The correction for total scattered-light in the extinction yields the absorbance from which the nanoparticle volume is derived. Nanoparticles appear at the onset of the trails near the droplet and grow along the trail from around 40 nm to 110 nm until they are outside the Rayleigh regime. The nanoparticle formation rate is 50 % of the total alumina formation rate during the symmetric phase. The large occurrence frequency of droplet jetting makes it an important contribution to nanoparticle formation and to the total heat release in aluminum combustion.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120633"},"PeriodicalIF":4.5,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The performance research of airflow multistage spouted bed by experimental and simulative methods

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-01-10 DOI: 10.1016/j.powtec.2025.120631

Biao Sun , Xinxin Che , Feng Wu , Junhao Hao , Xiaolong Li

On the basis of the problem on high bed pressure drop caused by unsteady spouting during gas-solid two-phase flow in a conventional spouted bed (CSB)，a reinforced component-airflow classifier (AC) with three zones of airflow dynamics (strong airflow zone, medium airflow zone and weak airflow zone) and five channels of particle dynamic cycles is designed. By combining experiment and numerical simulation methods to analyze the dynamic characteristics of gas-solid two-phase flow, heat and mass-transfer mechanism, and desulfurization efficiency of AMSB on airflow multistage spouted bed (AMSB) combined AC with a spouted bed (CSB), the results show that the gas-solid two-phase flow of AMSB is more stable, the bed expansion rate, the particle mixing rate, and the heat and mass transfer rate of AMSB is severally 2.28 times, 3.2 times and 1.5 times that of CSB. The desulfurization efficiency is increased by 4.49 % compared with the CSB.

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