Pub Date : 2025-10-31DOI: 10.1016/j.apt.2025.105097
Yuanyuan Tao , Junwei Huang , Jie Liu , Wencheng Ge , Tianjiao Chang , Kai Jiang , Liang Lv
Barite and fluorite commonly occur together in nature, posing a challenge for efficient separation. To overcome this, a novel anionic modified collector, α-fatty acid, was employed to enhance floatability differences. Using this collector, a barite concentrate with a BaSO4 grade of 79.76% and recovery of 86.38% was achieved from barite-fluorite mixed ore, confirming its selective separation potential. The adsorption mechanism was investigated through XRD, micro-flotation, zeta potential, FTIR, XPS, and DFT analyses. Results showed that α-fatty acid molecules chemisorb onto barite surfaces. The halogen atom at the α-position exerts an electron-withdrawing effect, forming a p-π conjugated system with the carboxyl group, which enhances polarity and strengthens adsorption selectivity toward barite. Moreover, the halogen increases steric hindrance, improving the collector’s solubility and dispersion in flotation systems.
{"title":"Study on flotation performance and selective adsorption mechanism of new α-fatty acid on associated barite","authors":"Yuanyuan Tao , Junwei Huang , Jie Liu , Wencheng Ge , Tianjiao Chang , Kai Jiang , Liang Lv","doi":"10.1016/j.apt.2025.105097","DOIUrl":"10.1016/j.apt.2025.105097","url":null,"abstract":"<div><div>Barite and fluorite commonly occur together in nature, posing a challenge for efficient separation. To overcome this, a novel anionic modified collector, α-fatty acid, was employed to enhance floatability differences. Using this collector, a barite concentrate with a BaSO<sub>4</sub> grade of 79.76% and recovery of 86.38% was achieved from barite-fluorite mixed ore, confirming its selective separation potential. The adsorption mechanism was investigated through XRD, micro-flotation, zeta potential, FTIR, XPS, and DFT analyses. Results showed that α-fatty acid molecules chemisorb onto barite surfaces. The halogen atom at the α-position exerts an electron-withdrawing effect, forming a p-π conjugated system with the carboxyl group, which enhances polarity and strengthens adsorption selectivity toward barite. Moreover, the halogen increases steric hindrance, improving the collector’s solubility and dispersion in flotation systems.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 12","pages":"Article 105097"},"PeriodicalIF":4.2,"publicationDate":"2025-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145415014","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}
Pub Date : 2025-10-30DOI: 10.1016/j.apt.2025.105091
Tian Qiu , Tingye Qi , Guorui Feng , Hongtao Xu , Haochen Wang , Linfei Wang , Siyuan Cheng , Lubin Li , Kexin Xu
Improper management of biomass power plant ash (BPPA), a byproduct of power generation, can lead to significant environmental issues. This study investigates the development of a novel cementitious material (NCM) via the alkali-thermal activation of BPPA, leveraging its pozzolanic properties. The effects of alkali activator concentration (0 %–4%), CaO content (25 %–65 %), and calcination temperature (850–1250 °C) on phase composition, microstructure, conductivity, and cementing performance were systematically evaluated. Using the Krstulovic–Dabic hydration model, the hydration mechanism and kinetics of NCM were analyzed. Results show that the alkali activator (Na2SiO3 + NaOH) promotes the formation of silicon-oxygen tetrahedra, increases pH, and facilitates C-S-H gel production via hydrothermal reactions. Higher CaO content reduces low-activity N-A-S-H phases and favors the formation of high-activity C-S-H phases. The main active phases after alkali-thermal activation are C12A7 and C2S. Optimal NCM preparation conditions—2 % alkali activator, 45 % CaO, and a calcination temperature of 950 °C—achieve compressive strengths of 12.18 MPa at 7 d and 24.66 MPa at 28 d. The production of NCM not only reduces cement demand but also enables the reuse of waste resources, supporting green and sustainable development.
{"title":"Preparation and mechanism of novel cementitious materials made from biomass power plant ash based on alkaline-thermal composite activation","authors":"Tian Qiu , Tingye Qi , Guorui Feng , Hongtao Xu , Haochen Wang , Linfei Wang , Siyuan Cheng , Lubin Li , Kexin Xu","doi":"10.1016/j.apt.2025.105091","DOIUrl":"10.1016/j.apt.2025.105091","url":null,"abstract":"<div><div>Improper management of biomass power plant ash (BPPA), a byproduct of power generation, can lead to significant environmental issues. This study investigates the development of a novel cementitious material (NCM) via the alkali-thermal activation of BPPA, leveraging its pozzolanic properties. The effects of alkali activator concentration (0 %–4%), CaO content (25 %–65 %), and calcination temperature (850–1250 °C) on phase composition, microstructure, conductivity, and cementing performance were systematically evaluated. Using the Krstulovic–Dabic hydration model, the hydration mechanism and kinetics of NCM were analyzed. Results show that the alkali activator (Na<sub>2</sub>SiO<sub>3</sub> + NaOH) promotes the formation of silicon-oxygen tetrahedra, increases pH, and facilitates C-S-H gel production via hydrothermal reactions. Higher CaO content reduces low-activity N-A-S-H phases and favors the formation of high-activity C-S-H phases. The main active phases after alkali-thermal activation are C<sub>12</sub>A<sub>7</sub> and C<sub>2</sub>S. Optimal NCM preparation conditions—2 % alkali activator, 45 % CaO, and a calcination temperature of 950 °C—achieve compressive strengths of 12.18 MPa at 7 d and 24.66 MPa at 28 d. The production of NCM not only reduces cement demand but also enables the reuse of waste resources, supporting green and sustainable development.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 12","pages":"Article 105091"},"PeriodicalIF":4.2,"publicationDate":"2025-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145415012","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}
The effects of media diameter ratio and agitation shaft geometry on grinding performance when using small and large media in a media stirred mill were experimentally investigated, and the mechanism and optimal configuration were elucidated through discrete element method simulations to reduce energy consumption by minimizing grinding time. The number ratio of large to small media was fixed at 1:1, the diameter of large media was fixed at 10 mm, and the diameter of small media was varied, namely 2, 3, and 5 mm. The highest grinding rate was experimentally obtained using 3 mm small media, consistent with the simulations. The simulations also showed that 2 mm small media passed through the gaps between the large media more easily and segregated at the ends of the mill, reducing both the collision energy and the grinding rate. Moreover, different agitator shaft geometries were evaluated, and the inclined agitator shaft facilitated the highest grinding rate by increasing the axial movement of the small media and the rate of high-energy collisions. Overall, the improve ratio of large to small media and an inclined agitator shaft can prevent small media segregation at both ends of the mill and thereby achieve the higher grinding rate.
{"title":"DEM analysis of the media size ratio and agitator shaft geometry effects on grinding performance in a mixed-media stirred mill","authors":"Ryo Miyazawa , Hidehiro Kamiya , Kenichi Momota , Satoshi Shiina , Kyouko Okuyama , Yuma Hatakeyama , Chiharu Tokoro","doi":"10.1016/j.apt.2025.105090","DOIUrl":"10.1016/j.apt.2025.105090","url":null,"abstract":"<div><div>The effects of media diameter ratio and agitation shaft geometry on grinding performance when using small and large media in a media stirred mill were experimentally investigated, and the mechanism and optimal configuration were elucidated through discrete element method simulations to reduce energy consumption by minimizing grinding time. The number ratio of large to small media was fixed at 1:1, the diameter of large media was fixed at 10 mm, and the diameter of small media was varied, namely 2, 3, and 5 mm. The highest grinding rate was experimentally obtained using 3 mm small media, consistent with the simulations. The simulations also showed that 2 mm small media passed through the gaps between the large media more easily and segregated at the ends of the mill, reducing both the collision energy and the grinding rate. Moreover, different agitator shaft geometries were evaluated, and the inclined agitator shaft facilitated the highest grinding rate by increasing the axial movement of the small media and the rate of high-energy collisions. Overall, the improve ratio of large to small media and an inclined agitator shaft can prevent small media segregation at both ends of the mill and thereby achieve the higher grinding rate.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 12","pages":"Article 105090"},"PeriodicalIF":4.2,"publicationDate":"2025-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145415013","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}
Pub Date : 2025-10-30DOI: 10.1016/j.apt.2025.105092
Fenqiang Li , Jiawei Shu , Qianting Wang , Xin Xu , Xinyu Chen , Jun Zhao
Magnetic pulse radial compaction (MPRC) is a high-speed powder consolidation technique capable of producing high-density green compacts. In this study, the MPRC process of W-Cu mixed powder was systematically investigated using a three-dimensional multi-particle finite element method. The influence of key process parameters — including discharge voltage, copper content and interfacial friction — on the densification behavior was quantitatively analyzed. The particle deformation mechanisms and pore closure behavior were also thoroughly examined. The results indicate that the MPRC densification process occurs in three distinct stages. In the initial stage, intense impact forces induce simultaneous particle rearrangement and elastoplastic deformation. This is followed by a second stage characterized by dominant large-scale plastic deformation with minimal further rearrangement. In the final stage, local vibrations and magnetic-induced expansions result in a slight reduction in relative density. It was found that both the uniformity of powder mixing and the evolution of force chain networks significantly affect densification. The rigid structure of tungsten particles tends to retain porosity, whereas the highly deformable copper particles promote densification through effective pore filling. Additionally, the radial density distribution of the compact is governed by the interaction between the incident stress wave from the outer shell and the reflected wave from the inner mandrel. Increasing the discharge voltage and Cu content leads to higher relative density, while higher friction coefficients impede densification. These findings provide theoretical insights into the design and optimization of MPRC processes for fabricating high-performance W-Cu composite components.
{"title":"Process analysis and densification for magnetic pulse radial compaction of w-cu mixed powder using multi-particle finite element method","authors":"Fenqiang Li , Jiawei Shu , Qianting Wang , Xin Xu , Xinyu Chen , Jun Zhao","doi":"10.1016/j.apt.2025.105092","DOIUrl":"10.1016/j.apt.2025.105092","url":null,"abstract":"<div><div>Magnetic pulse radial compaction (MPRC) is a high-speed powder consolidation technique capable of producing high-density green compacts. In this study, the MPRC process of W-Cu mixed powder was systematically investigated using a three-dimensional multi-particle finite element method. The influence of key process parameters — including discharge voltage, copper content and interfacial friction — on the densification behavior was quantitatively analyzed. The particle deformation mechanisms and pore closure behavior were also thoroughly examined. The results indicate that the MPRC densification process occurs in three distinct stages. In the initial stage, intense impact forces induce simultaneous particle rearrangement and elastoplastic deformation. This is followed by a second stage characterized by dominant large-scale plastic deformation with minimal further rearrangement. In the final stage, local vibrations and magnetic-induced expansions result in a slight reduction in relative density. It was found that both the uniformity of powder mixing and the evolution of force chain networks significantly affect densification. The rigid structure of tungsten particles tends to retain porosity, whereas the highly deformable copper particles promote densification through effective pore filling. Additionally, the radial density distribution of the compact is governed by the interaction between the incident stress wave from the outer shell and the reflected wave from the inner mandrel. Increasing the discharge voltage and Cu content leads to higher relative density, while higher friction coefficients impede densification. These findings provide theoretical insights into the design and optimization of MPRC processes for fabricating high-performance W-Cu composite components.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 12","pages":"Article 105092"},"PeriodicalIF":4.2,"publicationDate":"2025-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145415011","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}
This paper presents a coupled VOSET-IBM-DEM method on a hybrid Eulerian-Lagrangian framework to simulate particle-laden pool boiling. Combination of an interface capturing method (VOSET) and Lee mass transfer model is implemented to track the vapor–liquid interface during phase change in the Eulerian frame. An immersed boundary method is adopted to describe the interactions between fluids and particles. A discrete element method is coupled to solve the motion of the dispersed particle in the Lagrangian frame. An “extension” equation is incorporated into VOSET to achieve the contact-angle boundary condition. To ensure that the heat flux at the fluid–solid interface satisfies the thermal relation, an interfacial heat conduction model is incorporated into the energy equation. Several validation tests were conducted, demonstrating good agreement with theoretical, prior simulation, and experimental results. The model was then applied to simulate particle-laden pool boiling, investigating the effect of particle deposition. When the density ratio kρ ≥ 2, particle deposition leads to a reduction in nucleation sites and a decrease in boiling intensity. The heat conduction effect induced by particle deposition is greater than the evaporation effect caused by liquid–vapor phase change. As particle density increases, the particle deposition effect becomes more pronounced, resulting in a decrease in the average temperature of the heated surface and an increase in the average heat flux during the steady stage.
{"title":"A thermal-fluid model coupling VOSET-IBM-DEM method for simulating nucleate boiling in particle-laden fluids","authors":"Xin Chen, Bifeng Yin, Xiaoxiang Li, Ying Zhang, Sheng Xu, Fei Dong","doi":"10.1016/j.apt.2025.105086","DOIUrl":"10.1016/j.apt.2025.105086","url":null,"abstract":"<div><div>This paper presents a coupled VOSET-IBM-DEM method on a hybrid Eulerian-Lagrangian framework to simulate particle-laden pool boiling. Combination of an interface capturing method (VOSET) and Lee mass transfer model is implemented to track the vapor–liquid interface during phase change in the Eulerian frame. An immersed boundary method is adopted to describe the interactions between fluids and particles. A discrete element method is coupled to solve the motion of the dispersed particle in the Lagrangian frame. An “extension” equation is incorporated into VOSET to achieve the contact-angle boundary condition. To ensure that the heat flux at the fluid–solid interface satisfies the thermal relation, an interfacial heat conduction model is incorporated into the energy equation. Several validation tests were conducted, demonstrating good agreement with theoretical, prior simulation, and experimental results. The model was then applied to simulate particle-laden pool boiling, investigating the effect of particle deposition. When the density ratio <em>k<sub>ρ</sub></em> ≥ 2, particle deposition leads to a reduction in nucleation sites and a decrease in boiling intensity. The heat conduction effect induced by particle deposition is greater than the evaporation effect caused by liquid–vapor phase change. As particle density increases, the particle deposition effect becomes more pronounced, resulting in a decrease in the average temperature of the heated surface and an increase in the average heat flux during the steady stage.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 12","pages":"Article 105086"},"PeriodicalIF":4.2,"publicationDate":"2025-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145374613","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}
Pub Date : 2025-10-24DOI: 10.1016/j.apt.2025.105084
Seyed Ali Hosseini, Mohammad Kazemeini, Alireza Mohammadi
A novel layered double hydroxide (LDH) catalyst was synthesized using a metal–organic framework (MIL) as a precursor. It was used to remove Meropenem (MER) drug from a contaminated pharmaceutical waste through synergistic adsorption–photocatalytic degradation. The catalyst achieved a maximum degradation efficiency of 96.05 % using 50 mg of catalyst under UV light irradiation (30 min in the dark, followed by 150 min of illumination). The catalyst was thoroughly characterized, and its removal efficiency was evaluated under varying conditions, including catalyst dosage, MER concentration, pH, and temperature. Adsorption kinetics followed a pseudo-second-order model, indicating a chemisorption mechanism, while the photocatalytic degradation of MER fit well with a pseudo-first-order kinetic model. Thermodynamic analysis revealed the endothermic nature of the process. The adsorption equilibrium was best described by the Temkin isotherm. A detailed degradation mechanism was proposed based upon HPLC–MS/MS analysis, providing a structured and comprehensive interpretation of the degradation pathway. Scavenging experiments identified singlet oxygen (1O2) as the dominant reactive species, followed by •O2−, whereas •OH and h+ had minor effects. The catalyst exhibited excellent reusability, with only a 5.5 % decline in removal efficiency (from 96.05 % to 90.59 %) over five successive cycles. Post-reaction analyses confirmed its structural stability and recyclability.
{"title":"A Dual-Functional Ni-MCr LDH nanostructure utilized for degradation of Meropenem antibiotic pollutant: Synthesis and physiochemical Characterizations toward development of a novel chemical mechanism","authors":"Seyed Ali Hosseini, Mohammad Kazemeini, Alireza Mohammadi","doi":"10.1016/j.apt.2025.105084","DOIUrl":"10.1016/j.apt.2025.105084","url":null,"abstract":"<div><div>A novel layered double hydroxide (LDH) catalyst was synthesized using a metal–organic framework (MIL) as a precursor. It was used to remove Meropenem (MER) drug from a contaminated pharmaceutical waste through synergistic adsorption–photocatalytic degradation. The catalyst achieved a maximum degradation efficiency of 96.05 % using 50 mg of catalyst under UV light irradiation (30 min in the dark, followed by 150 min of illumination). The catalyst was thoroughly characterized, and its removal efficiency was evaluated under varying conditions, including catalyst dosage, MER concentration, pH, and temperature. Adsorption kinetics followed a pseudo-second-order model, indicating a chemisorption mechanism, while the photocatalytic degradation of MER fit well with a pseudo-first-order kinetic model. Thermodynamic analysis revealed the endothermic nature of the process. The adsorption equilibrium was best described by the Temkin isotherm. A detailed degradation mechanism was proposed based upon HPLC–MS/MS analysis, providing a structured and comprehensive interpretation of the degradation pathway. Scavenging experiments identified singlet oxygen (<sup>1</sup>O<sub>2</sub>) as the dominant reactive species, followed by •O<sub>2</sub><sup>−</sup>, whereas •OH and h<sup>+</sup> had minor effects. The catalyst exhibited excellent reusability, with only a 5.5 % decline in removal efficiency (from 96.05 % to 90.59 %) over five successive cycles. Post-reaction analyses confirmed its structural stability and recyclability.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 11","pages":"Article 105084"},"PeriodicalIF":4.2,"publicationDate":"2025-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145358348","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}
Pub Date : 2025-10-24DOI: 10.1016/j.apt.2025.105087
Jiahuan Rao, Jiazhan Wei, Jiawei Wen, Yao Tian
Superhydrophobic materials have demonstrated significant practical applications, inorganic whiskers have emerged as a preferred material for superhydrophobic applications, owing to their exceptional physicochemical properties. This paper reports a simple method for modifying the surface of hydrophilic calcium sulfate hemihydrate whiskers (CSHWs). The CSHWs were surface-modified with tetraethyl orthosilicate (TEOS) and hexadecyltrimethoxysilane (HDTMS) to achieve non-fluorinated superhydrophobic properties. The SiO2 generated by TEOS hydrolysis grows on the CSHWs surface in situ to form micro- and nano-structures, increasing the number of active sites. Combined with HDTMS low-surface-energy modification, superhydrophobicity is achieved. After modification, the static contact angle of the CSHWs increased from 0° to 162.22°. The whiskers’ morphology and phase composition remained unchanged before and after modification. TEOS and HDTMS chemically bonded to the surface through Ca-O-Si and Si-O-Si bonds. The modified CSHWs exhibit excellent thermal stability, hydrophobic stability, self-cleaning properties, and chemical stability. Even after calcination at 250 °C for one hour, ultrasonication in an aqueous solution for three hours, or immersion in 12 pH NaOH solution or 3.5 wt% NaCl solution for six hours, 2 pH HCl solution for two hours, the CSHWs still exhibit stable superhydrophobicity and oil–water separation performance.
{"title":"Non-fluorinated superhydrophobic modified calcium sulfate hemihydrate whiskers: Surface characterization and property analysis","authors":"Jiahuan Rao, Jiazhan Wei, Jiawei Wen, Yao Tian","doi":"10.1016/j.apt.2025.105087","DOIUrl":"10.1016/j.apt.2025.105087","url":null,"abstract":"<div><div>Superhydrophobic materials have demonstrated significant practical applications, inorganic whiskers have emerged as a preferred material for superhydrophobic applications, owing to their exceptional physicochemical properties. This paper reports a simple method for modifying the surface of hydrophilic calcium sulfate hemihydrate whiskers (CSHWs). The CSHWs were surface-modified with tetraethyl orthosilicate (TEOS) and hexadecyltrimethoxysilane (HDTMS) to achieve non-fluorinated superhydrophobic properties. The SiO<sub>2</sub> generated by TEOS hydrolysis grows on the CSHWs surface in situ to form micro- and nano-structures, increasing the number of active sites. Combined with HDTMS low-surface-energy modification, superhydrophobicity is achieved. After modification, the static contact angle of the CSHWs increased from 0° to 162.22°. The whiskers’ morphology and phase composition remained unchanged before and after modification. TEOS and HDTMS chemically bonded to the surface through Ca-O-Si and Si-O-Si bonds. The modified CSHWs exhibit excellent thermal stability, hydrophobic stability, self-cleaning properties, and chemical stability. Even after calcination at 250 °C for one hour, ultrasonication in an aqueous solution for three hours, or immersion in 12 pH NaOH solution or 3.5 wt% NaCl solution for six hours, 2 pH HCl solution for two hours, the CSHWs still exhibit stable superhydrophobicity and oil–water separation performance.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 11","pages":"Article 105087"},"PeriodicalIF":4.2,"publicationDate":"2025-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145358349","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}
Pub Date : 2025-10-24DOI: 10.1016/j.apt.2025.105089
Yingying Fu , Maolin Li , Jiaying Li , Kun Xia , Rui Cui , Ming Zhang , Wei Yao
Choosing appropriate calcite depressants is a major area of research for the flotation separation of scheelite and calcite, which remains a global challenge. This research explores how the Pb-tannic acid complex affects the flotation behavior of calcite and scheelite in a sodium oleate system. Flotation experiments indicate that tannic acid, when used alone, is not capable of effectively separating scheelite from calcite. However, the novel depressant Pb-tannic acid effectively depresses calcite while allowing scheelite flotation with a flotation recovery difference of 63.92 %. This depressant also exhibits excellent separation performance in artificial mixed ores. Mechanistic analysis demonstrates that Pb-tannic acid chemically adheres to calcite surfaces through interactions between its –OH groups and surface Ca2+ ions. The extensive adsorption of Pb-tannic acid on calcite hinders subsequent sodium oleate adsorption, thereby reducing its floatability. In contrast, minimal adsorption of Pb-tannic acid occurs on scheelite surfaces, allowing substantial sodium oleate adsorption and maintaining the high floatability of scheelite. As a novel depressant, Pb-tannic acid demonstrates excellent selectivity in the flotation separation of calcite and scheelite.
{"title":"Effects and mechanisms of Pb-tannic acid complexes on scheelite/calcite flotation","authors":"Yingying Fu , Maolin Li , Jiaying Li , Kun Xia , Rui Cui , Ming Zhang , Wei Yao","doi":"10.1016/j.apt.2025.105089","DOIUrl":"10.1016/j.apt.2025.105089","url":null,"abstract":"<div><div>Choosing appropriate calcite depressants is a major area of research for the flotation separation of scheelite and calcite, which remains a global challenge. This research explores how the Pb-tannic acid complex affects the flotation behavior of calcite and scheelite in a sodium oleate system. Flotation experiments indicate that tannic acid, when used alone, is not capable of effectively separating scheelite from calcite. However, the novel depressant Pb-tannic acid effectively depresses calcite while allowing scheelite flotation with a flotation recovery difference of 63.92 %. This depressant also exhibits excellent separation performance in artificial mixed ores. Mechanistic analysis demonstrates that Pb-tannic acid chemically adheres to calcite surfaces through interactions between its –OH groups and surface Ca<sup>2+</sup> ions. The extensive adsorption of Pb-tannic acid on calcite hinders subsequent sodium oleate adsorption, thereby reducing its floatability. In contrast, minimal adsorption of Pb-tannic acid occurs on scheelite surfaces, allowing substantial sodium oleate adsorption and maintaining the high floatability of scheelite. As a novel depressant, Pb-tannic acid demonstrates excellent selectivity in the flotation separation of calcite and scheelite.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 11","pages":"Article 105089"},"PeriodicalIF":4.2,"publicationDate":"2025-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145358234","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}
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