Powder Technology最新文献

英文中文

Study on dust suppression performance and field application of microbial dust suppressant based on microbial bacterial powder

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-02-08 DOI: 10.1016/j.powtec.2025.120710

Yongxiang Guo , Yanyun Zhao , Xiangming Hu , Xiao Li , Yue Feng , Mingyue Wu , Xiaoniu Yu , Ningjun Jiang , Suning Li

Microbial dust suppressant is a new hotspot in the research of mine dust control technology, but the development of its engineering application is slow due to the high cost and strict operating conditions. In this paper, the commercial microbial bacterial powder directly using tap water to formulate microbial dust suppressant, to determine the application effect in the coal mine drainage field, the results obtained are as follows: After spraying microbial dust suppressant, 1.4 cm of consolidation layer was formed on the surface of the drainage field, and the surface hardness of the soil layer reached 71 HA. The resistance to penetration was improved, and the loss of wind erosion quality was reduced to 1.2 ‰. The resistance to water erosion was increased by more than 7 times, which has a good solidification dust suppression effect. The microbial bacterial liquid played an important role in dust suppression in the first stage. The calcium carbonate was produced by microbial mineralization in the later stage, which greatly improved the water erosion resistance of the surface soil of the discharge field. The surface hardness of the consolidated layer of the discharge field could be used to characterize the resistance to water erosion in practical applications. However, due to the complex environment of discharge field, this study find that precipitation affect the dust suppression effect to a certain extent, while the matching problem between microbial powder and soil particles' pore space still needs to be studied in depth.

{"title":"Study on dust suppression performance and field application of microbial dust suppressant based on microbial bacterial powder","authors":"Yongxiang Guo , Yanyun Zhao , Xiangming Hu , Xiao Li , Yue Feng , Mingyue Wu , Xiaoniu Yu , Ningjun Jiang , Suning Li","doi":"10.1016/j.powtec.2025.120710","DOIUrl":"10.1016/j.powtec.2025.120710","url":null,"abstract":"<div><div>Microbial dust suppressant is a new hotspot in the research of mine dust control technology, but the development of its engineering application is slow due to the high cost and strict operating conditions. In this paper, the commercial microbial bacterial powder directly using tap water to formulate microbial dust suppressant, to determine the application effect in the coal mine drainage field, the results obtained are as follows: After spraying microbial dust suppressant, 1.4 cm of consolidation layer was formed on the surface of the drainage field, and the surface hardness of the soil layer reached 71 HA. The resistance to penetration was improved, and the loss of wind erosion quality was reduced to 1.2 ‰. The resistance to water erosion was increased by more than 7 times, which has a good solidification dust suppression effect. The microbial bacterial liquid played an important role in dust suppression in the first stage. The calcium carbonate was produced by microbial mineralization in the later stage, which greatly improved the water erosion resistance of the surface soil of the discharge field. The surface hardness of the consolidated layer of the discharge field could be used to characterize the resistance to water erosion in practical applications. However, due to the complex environment of discharge field, this study find that precipitation affect the dust suppression effect to a certain extent, while the matching problem between microbial powder and soil particles' pore space still needs to be studied in depth.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120710"},"PeriodicalIF":4.5,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143386594","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

Current status, challenges, and development trends in the synthesis of high-quality titanium nitride powders

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-02-08 DOI: 10.1016/j.powtec.2025.120766

Maoqiao Xiang , Wenjun Ding , Fen Yue , Qinghua Dong , Qingshan Zhu

Titanium nitride (TiN) is a typical transition metal nitride known for its excellent physical and chemical properties, attracting extensive interest in mechanical, electronic, biological, and catalytic applications. The stoichiometry, particle size, and impurity content of TiN powders are critical factors influencing material performance. High-quality TiN powders typically require small particle sizes, low impurity levels, and near-stoichiometric compositions. Nevertheless, current synthesis methods often struggle with mismatched mass transfer and reaction processes, posing challenges to the production of high-quality TiN powders. Herein, the quality of TiN powders produced by solid-phase, liquid-phase, and gas-phase synthesis methods are reviewed from the perspective of the reaction system. We explore the critical obstacles to achieving high-quality TiN powders and outline recent strategies aimed at improving mass and heat transfer, alongside optimizing reaction pathways. Finally, insights into the developmental trends in TiN powder are presented.

{"title":"Current status, challenges, and development trends in the synthesis of high-quality titanium nitride powders","authors":"Maoqiao Xiang , Wenjun Ding , Fen Yue , Qinghua Dong , Qingshan Zhu","doi":"10.1016/j.powtec.2025.120766","DOIUrl":"10.1016/j.powtec.2025.120766","url":null,"abstract":"<div><div>Titanium nitride (TiN) is a typical transition metal nitride known for its excellent physical and chemical properties, attracting extensive interest in mechanical, electronic, biological, and catalytic applications. The stoichiometry, particle size, and impurity content of TiN powders are critical factors influencing material performance. High-quality TiN powders typically require small particle sizes, low impurity levels, and near-stoichiometric compositions. Nevertheless, current synthesis methods often struggle with mismatched mass transfer and reaction processes, posing challenges to the production of high-quality TiN powders. Herein, the quality of TiN powders produced by solid-phase, liquid-phase, and gas-phase synthesis methods are reviewed from the perspective of the reaction system. We explore the critical obstacles to achieving high-quality TiN powders and outline recent strategies aimed at improving mass and heat transfer, alongside optimizing reaction pathways. Finally, insights into the developmental trends in TiN powder are presented.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120766"},"PeriodicalIF":4.5,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143386587","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

Comprehensive study on cluster characteristics with different particle properties in the diameter-varying fluidized bed reactor 直径变化流化床反应器中不同颗粒特性的团聚特征综合研究

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-02-08 DOI: 10.1016/j.powtec.2025.120754

Wu Gongpeng, Li Yanna, Sun Liangzhao, He Yan

Particle property plays an important role in cluster motion for gas-solid two-phase flow. However, the relationship between particle property and cluster motion in the diameter-varying riser is unclear. Thus, the complicated influence mechanisms of particle density and diameter on cluster motion in the diameter-varying riser are studied experimentally. Four types of solid particles serve as bed material and solid concentration data recorded by optical fiber probe are used to analyze cluster motion characteristics. The results show that cluster motion characteristics intensify in the enlarged segment with increasing particle density and diameter. The effects of solid flux and gas velocity on particle cluster tend to increase when particle density and diameter increase. Additionally, particle property exerts significant impacts on cluster motion in the enlarged segment compared to the straight segment. At the same solid concentration, cluster holdup depends more on particle density rather than particle diameter.

引用次数: 0

Effects and mechanisms of clay coating removal from coal surface by hydrodynamic cavitation nanobubbles

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-02-08 DOI: 10.1016/j.powtec.2025.120748

Bo Qiao , Zhongxian Wu , Ling Zhang , Shuo Yang , Dongping Tao

The clay coating on coal particle surface is one of the main reasons for poor coal flotation performance. It hinders the adsorption of flotation collector on coal particles and their subsequent attachment to air bubbles, leading to deteriorated flotation. This study was aimed to explore the effects and mechanisms of clay coating removal in coal flotation by hydrodynamic cavitation nanobubbles. The main characterization and analysis techniques employed included micro-flotation tests, spectrophotometer, focused beam reflectance measurement (FBRM), scanning electron microscopy (SEM), nanoparticle tracking analyzer (NTA). The flotation tests showed that nanobubbles enhanced the flotation recovery by up to 86.6 %. Nanobubbles significantly reduced the adverse effects of clay coating and thus produced a cleaner coal product. The kerosene adsorption capacity was almost doubled at a cavitation flow rate of 1000 mL/min. The in-situ FBRM characterization of particle sizes showed that the number of kaolinite particles increased dramatically in solution following the cavitation treatment of coal slurry. Meanwhile, a significant correlation was identified between nanobubble concentration and particle number in the solution. These results showed that the combined effect of hydrodynamic cavitation and nanobubbles effectively removed the clay coating from coal surface.

{"title":"Effects and mechanisms of clay coating removal from coal surface by hydrodynamic cavitation nanobubbles","authors":"Bo Qiao , Zhongxian Wu , Ling Zhang , Shuo Yang , Dongping Tao","doi":"10.1016/j.powtec.2025.120748","DOIUrl":"10.1016/j.powtec.2025.120748","url":null,"abstract":"<div><div>The clay coating on coal particle surface is one of the main reasons for poor coal flotation performance. It hinders the adsorption of flotation collector on coal particles and their subsequent attachment to air bubbles, leading to deteriorated flotation. This study was aimed to explore the effects and mechanisms of clay coating removal in coal flotation by hydrodynamic cavitation nanobubbles. The main characterization and analysis techniques employed included micro-flotation tests, spectrophotometer, focused beam reflectance measurement (FBRM), scanning electron microscopy (SEM), nanoparticle tracking analyzer (NTA). The flotation tests showed that nanobubbles enhanced the flotation recovery by up to 86.6 %. Nanobubbles significantly reduced the adverse effects of clay coating and thus produced a cleaner coal product. The kerosene adsorption capacity was almost doubled at a cavitation flow rate of 1000 mL/min. The in-situ FBRM characterization of particle sizes showed that the number of kaolinite particles increased dramatically in solution following the cavitation treatment of coal slurry. Meanwhile, a significant correlation was identified between nanobubble concentration and particle number in the solution. These results showed that the combined effect of hydrodynamic cavitation and nanobubbles effectively removed the clay coating from coal surface.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120748"},"PeriodicalIF":4.5,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378715","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

Process difference and mechanism study between silica fume and chemical reagents in the preparation of DDR zeolite

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-02-08 DOI: 10.1016/j.powtec.2025.120749

Zhonghao Peng, Dongru Liu, Ze Liu, Qiuwen Zhang, Dongmin Wang, Hongying Liu

The preparation of DDR zeolite using solid waste silica fume without seed can significantly reduce costs. However, there are significant differences between the processes of preparing DDR zeolite from silica fume and traditional silica sources. In this study, DDR zeolite was synthesized from solid waste silica fume and traditional chemical reagents (HS-40 and TMOS) without seed. The differences in phase composition, micromorphology, and the Si dissolution process between silica fume and chemical reagents were investigated to explore the differences in DDR zeolite synthesis processes. The product synthesized from silica fume, despite having the slowest reaction rate, exhibited the highest purity of DDR zeolite and the highest CO₂ adsorption capacity. To investigate the mechanism of DDR zeolite synthesis from silica fume, silica fume was added to chemical reagents at ranging from 1 to 20 wt%. It was found that silica fume not only acted like a seed to promote the growth of DDR zeolite but also facilitated the dissolution of small crystal impurities through the mechanism of Ostwald ripening, providing nutrients for the growth of DDR zeolite. This led to increases in DDR zeolite content by 5–19 % and 8–50 % in the products of HS-40 and TMOS, respectively.

{"title":"Process difference and mechanism study between silica fume and chemical reagents in the preparation of DDR zeolite","authors":"Zhonghao Peng, Dongru Liu, Ze Liu, Qiuwen Zhang, Dongmin Wang, Hongying Liu","doi":"10.1016/j.powtec.2025.120749","DOIUrl":"10.1016/j.powtec.2025.120749","url":null,"abstract":"<div><div>The preparation of DDR zeolite using solid waste silica fume without seed can significantly reduce costs. However, there are significant differences between the processes of preparing DDR zeolite from silica fume and traditional silica sources. In this study, DDR zeolite was synthesized from solid waste silica fume and traditional chemical reagents (HS-40 and TMOS) without seed. The differences in phase composition, micromorphology, and the Si dissolution process between silica fume and chemical reagents were investigated to explore the differences in DDR zeolite synthesis processes. The product synthesized from silica fume, despite having the slowest reaction rate, exhibited the highest purity of DDR zeolite and the highest CO<sub>2</sub> adsorption capacity. To investigate the mechanism of DDR zeolite synthesis from silica fume, silica fume was added to chemical reagents at ranging from 1 to 20 wt%. It was found that silica fume not only acted like a seed to promote the growth of DDR zeolite but also facilitated the dissolution of small crystal impurities through the mechanism of Ostwald ripening, providing nutrients for the growth of DDR zeolite. This led to increases in DDR zeolite content by 5–19 % and 8–50 % in the products of HS-40 and TMOS, respectively.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120749"},"PeriodicalIF":4.5,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402648","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

Investigation on the effects of dwell time and loading strain rate on powder compaction and tablet properties: A compaction simulator study

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-02-08 DOI: 10.1016/j.powtec.2025.120759

MayLin T. Howard , Gerard R. Klinzing

This study aims to decouple the effect of dwell time and strain rate on tablet strength and cracking behavior. Using a hydraulic compaction simulator, dwell time and strain rate were isolated from other parameters in the compaction cycle so that their independent contributions to tabletability could be studied. Dwell time was ranged from 10 ms – 100 s and strain rates were ranged from 1 s⁻¹ to 100 s⁻¹. Common excipients with a range of material attributes were used: microcrystalline cellulose (MCC), dibasic anhydrous calcium phosphate (DCP), and pregelatinized starch. It was found that the impact of dwell time is material-dependent and that dwell time can improve tensile strength of compacts, but only at time scales beyond what is achievable on any rotary tablet press. Moreover, only MCC tablets were observed to form cracks at high strain rates where only at extreme dwell times cracking was partially improved. When contextualized by dwell time attainable on a rotary press (10–100 ms), the effects of dwell time were found to be marginal to non-existent depending on the material. For strain rate, the effect was also material-dependent, but had a clear impact on tablet strength development and cracking behavior for MCC. Overall, it was found that for the materials tested, dwell time and strain rate can impact tabletability; however, only strain rate influences on timescales relevant for the rotary press.

{"title":"Investigation on the effects of dwell time and loading strain rate on powder compaction and tablet properties: A compaction simulator study","authors":"MayLin T. Howard , Gerard R. Klinzing","doi":"10.1016/j.powtec.2025.120759","DOIUrl":"10.1016/j.powtec.2025.120759","url":null,"abstract":"<div><div>This study aims to decouple the effect of dwell time and strain rate on tablet strength and cracking behavior. Using a hydraulic compaction simulator, dwell time and strain rate were isolated from other parameters in the compaction cycle so that their independent contributions to tabletability could be studied. Dwell time was ranged from 10 ms – 100 s and strain rates were ranged from 1 s<sup>−1</sup> to 100 s<sup>−1</sup>. Common excipients with a range of material attributes were used: microcrystalline cellulose (MCC), dibasic anhydrous calcium phosphate (DCP), and pregelatinized starch. It was found that the impact of dwell time is material-dependent and that dwell time can improve tensile strength of compacts, but only at time scales beyond what is achievable on any rotary tablet press. Moreover, only MCC tablets were observed to form cracks at high strain rates where only at extreme dwell times cracking was partially improved. When contextualized by dwell time attainable on a rotary press (10–100 ms), the effects of dwell time were found to be marginal to non-existent depending on the material. For strain rate, the effect was also material-dependent, but had a clear impact on tablet strength development and cracking behavior for MCC. Overall, it was found that for the materials tested, dwell time and strain rate can impact tabletability; however, only strain rate influences on timescales relevant for the rotary press.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120759"},"PeriodicalIF":4.5,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402640","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

Generating realistic DEM shape using improved spherical harmonic reconstruction considering form, roundness, and roughness 考虑形状、圆度和粗糙度，利用改进的球谐波重构技术生成逼真的 DEM 形状

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-02-08 DOI: 10.1016/j.powtec.2025.120755

Songling Han , Changming Wang , Xiaoyang Liu , Mingmin Zhang

The shape of particles significantly influences their mechanical properties, making accurate shape modeling crucial in numerical simulations. This paper proposes a framework for generating particles by applying improved spherical harmonic reconstructions to convex hull surfaces. The framework integrates mesh refinement techniques to enhance mesh resolution, enabling the generation of finer surface details than 3D laser scanning. Three parameters are introduced:

∆ K_{1}

, which controls roundness;

∆ K_{2}

, which governs roughness; and

R_{d}

, which represents the boundary between roundness and roughness in spherical harmonic reconstructions. Introducing these parameters not only allows independent control over the three levels of shape (form, roundness, and roughness) but also enhances the flexibility of the method, enabling the generation of various particle shapes. Granular assemblies with varying roundness and roughness distributions are generated and applied in discrete element method (DEM) simulations of triaxial shear. The results show that roundness is negatively correlated with the peak friction angle, while roughness is positively correlated. The proposed method enhances the ability to generate complex particle shapes, offering a practical tool for modeling and simulating granular materials.

{"title":"Generating realistic DEM shape using improved spherical harmonic reconstruction considering form, roundness, and roughness","authors":"Songling Han , Changming Wang , Xiaoyang Liu , Mingmin Zhang","doi":"10.1016/j.powtec.2025.120755","DOIUrl":"10.1016/j.powtec.2025.120755","url":null,"abstract":"<div><div>The shape of particles significantly influences their mechanical properties, making accurate shape modeling crucial in numerical simulations. This paper proposes a framework for generating particles by applying improved spherical harmonic reconstructions to convex hull surfaces. The framework integrates mesh refinement techniques to enhance mesh resolution, enabling the generation of finer surface details than 3D laser scanning. Three parameters are introduced: <span><math><mo>∆</mo><msub><mi>K</mi><mn>1</mn></msub></math></span>, which controls roundness; <span><math><mo>∆</mo><msub><mi>K</mi><mn>2</mn></msub></math></span>, which governs roughness; and <span><math><msub><mi>R</mi><mi>d</mi></msub></math></span>, which represents the boundary between roundness and roughness in spherical harmonic reconstructions. Introducing these parameters not only allows independent control over the three levels of shape (form, roundness, and roughness) but also enhances the flexibility of the method, enabling the generation of various particle shapes. Granular assemblies with varying roundness and roughness distributions are generated and applied in discrete element method (DEM) simulations of triaxial shear. The results show that roundness is negatively correlated with the peak friction angle, while roughness is positively correlated. The proposed method enhances the ability to generate complex particle shapes, offering a practical tool for modeling and simulating granular materials.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120755"},"PeriodicalIF":4.5,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422211","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

An overlappable coarsening strategy for discrete element method simulations of bi-disperse granular flows

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-02-08 DOI: 10.1016/j.powtec.2025.120765

Yaxiong Yu , Fan Duan , Lingxue Wang , Qiang Zhou

The coarsening strategy provides a promising avenue for industrial applications of the discrete element method by profoundly reducing computational costs. However, its application in multi-particle-size systems often results in underestimations of the packing solid volume fraction when employing different coarsening ratios. To address this issue, we propose a novel overlappable coarse-grained model specifically designed for bi-disperse systems. In this model, particles are allowed to overlap to a certain extent without experiencing collision forces, with the degree of overlapping described by an overlapping coefficient. This coefficient is determined through fitting discrete element method simulation of bi-disperse packings. Posterior analyses reveal that the traditional coarse-grained discrete element method significantly underpredicts the packing solid volume fraction and consequently the segregation behavior. In contrast, our proposed overlappable coarsening strategy accurately predicts both the packing solid volume fraction and segregation behavior when employing the fitted overlapping coefficient.

{"title":"An overlappable coarsening strategy for discrete element method simulations of bi-disperse granular flows","authors":"Yaxiong Yu , Fan Duan , Lingxue Wang , Qiang Zhou","doi":"10.1016/j.powtec.2025.120765","DOIUrl":"10.1016/j.powtec.2025.120765","url":null,"abstract":"<div><div>The coarsening strategy provides a promising avenue for industrial applications of the discrete element method by profoundly reducing computational costs. However, its application in multi-particle-size systems often results in underestimations of the packing solid volume fraction when employing different coarsening ratios. To address this issue, we propose a novel overlappable coarse-grained model specifically designed for bi-disperse systems. In this model, particles are allowed to overlap to a certain extent without experiencing collision forces, with the degree of overlapping described by an overlapping coefficient. This coefficient is determined through fitting discrete element method simulation of bi-disperse packings. Posterior analyses reveal that the traditional coarse-grained discrete element method significantly underpredicts the packing solid volume fraction and consequently the segregation behavior. In contrast, our proposed overlappable coarsening strategy accurately predicts both the packing solid volume fraction and segregation behavior when employing the fitted overlapping coefficient.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120765"},"PeriodicalIF":4.5,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422432","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

Enhancement and mechanistic study of ilmenite aeration leaching for synthetic rutile production using a horizontal reactor

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-02-07 DOI: 10.1016/j.powtec.2025.120740

Lei Zhou , Qiu-Yue Zhao , Guo-Zhi Lv , Zhi-He Dou , Ting-An Zhang

The Becher process is an eco-friendly technology that produces synthetic rutile by aeration leaching of metallic iron from reduced ilmenite. However, the method is highly time-consuming and requires enhanced efficiency. The study employed a horizontal reactor (HR) as an alternative to the conventional vertical reactor (VR), utilizing the response surface methodology (RSM) to optimize the process in both reactors. Results indicate that at 80 °C and an 8 mL/g liquid-solid ratio, the aeration efficiency of metallic iron in the HR reached 97.3 % in 6 h. In contrast, the VR yielded only 80.9 %, with HR significantly enhancing the reaction rate. The study also examined the apparent kinetics of the aeration leaching process and the electrochemical corrosion kinetics of metallic iron under aeration conditions, revealing that the reaction control steps in both HR and VR are surface chemical reactions. CFD simulation characterized the fluid flow behavior within the HR and VR, showing that the turbulence within the HR is more substantial and uniform, facilitating a superior mixing effect. And the HR generates smaller bubble sizes, allowing the solution to reach higher dissolved oxygen concentrations more quickly, thus improving efficiency. The obtained understanding and methodology shed light on the mechanism of HR and lay the groundwork for research on optimizing fluid mixing and mass transfer to enhance aeration efficiency.

{"title":"Enhancement and mechanistic study of ilmenite aeration leaching for synthetic rutile production using a horizontal reactor","authors":"Lei Zhou , Qiu-Yue Zhao , Guo-Zhi Lv , Zhi-He Dou , Ting-An Zhang","doi":"10.1016/j.powtec.2025.120740","DOIUrl":"10.1016/j.powtec.2025.120740","url":null,"abstract":"<div><div>The Becher process is an eco-friendly technology that produces synthetic rutile by aeration leaching of metallic iron from reduced ilmenite. However, the method is highly time-consuming and requires enhanced efficiency. The study employed a horizontal reactor (HR) as an alternative to the conventional vertical reactor (VR), utilizing the response surface methodology (RSM) to optimize the process in both reactors. Results indicate that at 80 °C and an 8 mL/g liquid-solid ratio, the aeration efficiency of metallic iron in the HR reached 97.3 % in 6 h. In contrast, the VR yielded only 80.9 %, with HR significantly enhancing the reaction rate. The study also examined the apparent kinetics of the aeration leaching process and the electrochemical corrosion kinetics of metallic iron under aeration conditions, revealing that the reaction control steps in both HR and VR are surface chemical reactions. CFD simulation characterized the fluid flow behavior within the HR and VR, showing that the turbulence within the HR is more substantial and uniform, facilitating a superior mixing effect. And the HR generates smaller bubble sizes, allowing the solution to reach higher dissolved oxygen concentrations more quickly, thus improving efficiency. The obtained understanding and methodology shed light on the mechanism of HR and lay the groundwork for research on optimizing fluid mixing and mass transfer to enhance aeration efficiency.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120740"},"PeriodicalIF":4.5,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402641","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

Characterization and microscopic mechanism analysis of urea-modified dry water powders for inhibiting dust explosion of aluminum‑magnesium alloys

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-02-07 DOI: 10.1016/j.powtec.2025.120760

Shizemin Song , Xiangbao Meng , Xunxian Shi , Yadi Li , Jihe Chen , Yujian Zhu , Zhao Qin , Xiaozhen Yu

Aluminum‑magnesium alloy has been widely used in electronics, automotive, aerospace and other fields due to its advantages of high strength, low density and good heat dissipation. The accompanying aluminum‑magnesium alloy dust explosion accidents have been increasing. In order to prevent the occurrence of this accident, a new type of urea-modified dry water (UMDW) powder was prepared by using urea solution as a core material, which was applied to the suppression of aluminum‑magnesium alloy dust explosion. Experiments on dust explosion pressure and flame propagation characteristics were carried out, and the explosion products were analyzed by XRD, XPS and other testing methods. The results showed that after the addition of 40 wt% UMDW, the maximum explosion pressure of aluminum‑magnesium alloy dust decreased from 0.621 MPa to 0.093 MPa, with a decrease of 85.02 %; (dp/dt)_max decreased from 11.6 MPa/s to 1.29 MPa/s, with a decrease of 88.88 %; the flame propagation height decreased from 600 mm to 269.54 mm. The flame propagation height decreased from 600 mm to 269.54 mm, and the flame propagation speed decreased from 5.51 m/s to 0.7 m/s. Chemkin pro was used to perform temperature sensitivity analysis to find out the key reaction steps of UMDW on the explosion suppression of aluminum and magnesium alloys dust, and to reveal its microscopic and efficient explosion suppression mechanism.

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