Advanced Powder Technology最新文献_第5页

Crack suppression during debinding of photocured green bodies comprising interparticle polymer cross-links with silane oligomers 用硅烷低聚物进行颗粒间聚合物交联的光固化绿色体在脱胶过程中抑制裂纹的产生

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2024-09-26 DOI: 10.1016/j.apt.2024.104663

Sayaka Yamada , Naonori Sakamoto , Junichi Tatami , Motoyuki Iijima

Interparticle photo-cross-linkable suspension, which is a suspension photocurable via polymer cross-linking reaction among ceramic particles stabilized by a reactive polymer dispersant, is one of the promising materials to realize three-dimensional structuring of ceramic components through hybridized approaches of photocuring and green machining. Reactive silane oligomers functionalized with acryloyl groups (A-Si) have been reported to copolymerize in the interparticle cross-links, effectively inhibiting cracking during rapid debinding of green bodies. However, the role of A-Si in crack suppression during debinding remains poorly understood. Herein, the impact of A-Si copolymerization on the crack prevention of photo-cured bodies during rapid debinding is systematically investigated by high-temperature in situ three-point bending tests of photo-cured bodies and characterization of the microstructures and chemical structures of interparticle photo-crosslinks. Co-polymerization of A-Si in the cross-links improved the three-point bending strength of debinded bodies at 500–600 °C, where the green bodies without A-Si cracked. The prevention of cracking during debinding in samples containing A-Si was attributed to the generation of inorganic siloxane cross-links. This study provides a perspective on crafting machinable photo-cured green compacts, enabling their processing through time- and cost-effective rapid debinding methods.

颗粒间光交联悬浮液是一种通过反应性聚合物分散剂稳定的陶瓷颗粒间的聚合物交联反应实现光固化的悬浮液，是通过光固化和绿色加工的混合方法实现陶瓷部件三维结构化的有前途的材料之一。据报道，丙烯酰基官能化的反应性硅烷低聚物（A-Si）可在颗粒间的交联中发生共聚，从而有效抑制生坯快速脱模过程中的开裂。然而，人们对 A-Si 在排胶过程中抑制裂纹的作用仍知之甚少。在此，通过对光固化体进行高温原位三点弯曲试验，并对粒子间光交联的微观结构和化学结构进行表征，系统地研究了 A-Si 共聚对光固化体在快速脱胶过程中防止开裂的影响。交联中的 A-Si 共聚提高了脱胶体在 500-600 °C 下的三点弯曲强度，而不含 A-Si 的绿色脱胶体则会开裂。含有 A-Si 的样品在排胶过程中防止了开裂，这要归功于无机硅氧烷交联的产生。这项研究为制作可加工的光固化绿色密实材料提供了一个视角，使其能够通过省时、经济的快速排胶方法进行加工。

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引用次数: 0

Depressing molybdenite using calcium lignosulfonate in Cu-Mo flotation separation: Interaction and desorption insights 在铜钼浮选分离中使用木质素磺酸钙抑制辉钼矿：相互作用和解吸的启示

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2024-09-25 DOI: 10.1016/j.apt.2024.104665

Guanyu Liang, Song Zhang, Yongjun Xian, Luzheng Chen

This study investigated the potential mechanisms by which lignosulfonate selectively depresses the flotation of fine molybdenite during Cu–Mo flotation separation using ethyl potassium xanthate as a collector. The flotation tests confirmed that molybdenite was significantly depressed by calcium lignosulfonate, whereas chalcopyrite flotation was only slightly affected. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy were employed to explore the distinct interaction of lignosulfonates with the mineral surfaces: chelation/complexation occurred between the deprotonated oxygen-contained groups in calcium lignosulfonate with the exposed metal sites on the surface of chalcopyrite, whereas the hydrophobic interaction between calcium lignosulfonate and molybdenite was the main driving force of adsorption. Additionally, the adsorption experiments suggested that the calcium lignosulfonate previously adsorbed on chalcopyrite could be removed by treatment with ethyl potassium xanthate while there was a relatively small effect on the calcium lignosulfonate previously adsorbed on the surface of molybdenite. Therefore, depressing molybdenite and floating chalcopyrite achieved by using calcium lignosulfonate as the depressant and ethyl potassium xanthate as the collector.

本研究调查了木质素磺酸钙在使用黄原酸乙酯钾作为捕收剂进行铜-钼浮选分离时选择性抑制细粒辉钼矿浮选的潜在机制。浮选试验证实，木质素磺酸钙会明显抑制辉钼矿的浮选，而黄铜矿的浮选只受到轻微影响。傅立叶变换红外光谱和 X 射线光电子能谱被用来探索木质素磺酸盐与矿物表面的不同相互作用：木质素磺酸钙中的去质子化含氧基团与黄铜矿表面暴露的金属位点之间发生了螯合/络合作用，而木质素磺酸钙与辉钼矿之间的疏水作用则是吸附的主要动力。此外，吸附实验表明，用黄原酸乙酯钾处理可以去除黄铜矿上吸附的木质素磺酸钙，而对辉钼矿表面吸附的木质素磺酸钙的影响相对较小。因此，使用木质素磺酸钙作为抑制剂，黄原酸乙酯钾作为捕集剂，可以达到抑制辉钼矿和浮选黄铜矿的目的。

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引用次数: 0

High-temperature thermochemical conversion of iron ore tailings into diopside and akermanite-based composite materials 将铁矿尾矿高温热化学转化为透辉石和赤铁矿基复合材料

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2024-09-24 DOI: 10.1016/j.apt.2024.104670

Xu Zou, Liangliang Fu, Jia Song, Guangwen Xu, Dingrong Bai

Iron ore tailings (IOTs), the residue materials generated during iron ore processing, pose environmental challenges due to their massive volume and potential impact on ecosystems. This study proposes a sustainable approach to manage and utilize this solid waste by converting it into value-added composite materials through high-temperature thermochemical reactions. Experiments are conducted in a tubular reactor at various reaction temperatures and times, and the resulting product samples are comprehensively characterized to elucidate their chemical compositional, physical, microstructural, thermal, and electrical properties. The results reveal that at optimal reaction temperatures (1230–1260 °C) and reaction times (20–120 min), the synthesized product is predominantly composed of diopside (CaMgSi₂O₆) and akermanite (Ca₂MgSi₂O₇). Additionally, we demonstrate that the product can be diopside-rich or akermanite-rich when blending silica and MgO powders into the IOTs to control the starting material composition, opening a promising avenue for large-scale sustainable utilization of industrial solid waste.

铁矿石尾矿（IOTs）是铁矿石加工过程中产生的残留物，由于其数量巨大且对生态系统有潜在影响，因此给环境带来了挑战。本研究提出了一种可持续的方法来管理和利用这种固体废弃物，通过高温热化学反应将其转化为高附加值的复合材料。实验在管式反应器中以不同的反应温度和时间进行，并对所得产品样品进行全面表征，以阐明其化学成分、物理、微结构、热和电特性。结果表明，在最佳反应温度（1230-1260 °C）和反应时间（20-120 分钟）下，合成产物主要由透辉石（CaMgSi2O6）和赤铁矿（Ca2MgSi2O7）组成。此外，我们还证明了在 IOT 中掺入二氧化硅和氧化镁粉末以控制起始材料成分时，产物可以是富含透辉石的，也可以是富含赤铁矿的，这为大规模可持续利用工业固体废弃物开辟了一条前景广阔的途径。

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引用次数: 0

Regulation of self-assembled microsphere structure and performance through binder synergy 通过粘合剂协同作用调节自组装微球的结构和性能

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2024-09-23 DOI: 10.1016/j.apt.2024.104677

Shanghao Du, Fan Wang, Jiahui Yang, Zhihua Xue, Yu Lei, Renqi Gao, Chongwei An, Jingyu Wang, Bidong Wu

Composite energetic material structure plays a critical role in combustion and detonation performance. In this study, boron (B)/copper oxide (CuO) composite microspheres with regular morphology, uniform elemental distribution, high circularity, and good charging performance were prepared using droplet microfluidic technology (DMT) with nitrocellulose (NC) and fluorine rubber (F₂₆₀₄) as binder solutions. The effects of binder synergy on the structure, thermal properties, mechanical sensitivity, and combustion performance of the microspheres were systematically investigated. The results show that the apparent and internal structures, as well as the dimensions of the microspheres, can be modulated by adjusting the binder ratio and the concentration of fluorine rubber. This adjustment allowed for the transformation of the microspheres from bowl-like to spherical forms, improving their charging performance. Additionally, the exothermic peak and output flame temperature of the samples exhibited regular changes after adjusting the binder, enabling controlled regulation of burning speed. This study provides insights into how binder synergy affects the structure and performance of energetic microspheres, offering valuable reference points for the preparation of other composite energetic materials.

复合高能材料结构对燃烧和爆轰性能起着至关重要的作用。本研究采用液滴微流体技术（DMT），以硝化纤维素（NC）和氟橡胶（F2604）为粘结剂溶液，制备了形态规整、元素分布均匀、圆度高、装药性能良好的硼（B）/氧化铜（CuO）复合微球。系统研究了粘合剂协同作用对微球结构、热性能、机械敏感性和燃烧性能的影响。结果表明，微球的表观和内部结构以及尺寸可通过调整粘合剂比例和氟橡胶浓度来调节。这种调整可使微球从碗状转变为球状，从而改善其充电性能。此外，在调整粘合剂后，样品的放热峰值和输出火焰温度呈现出规律性变化，从而实现了燃烧速度的可控调节。这项研究深入揭示了粘合剂协同作用如何影响高能微球的结构和性能，为制备其他复合高能材料提供了有价值的参考。

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引用次数: 0

Improving the roller screen efficiency to classify green iron pellets using DEM simulation, novel roll design and implementing banana configuration 利用 DEM 仿真、新颖的辊子设计和香蕉配置提高辊筛分级绿色铁球团的效率

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2024-09-21 DOI: 10.1016/j.apt.2024.104675

Mehrshad Asghari , Mohammad Noaparast , Mohammad Jahani Chegeni

Roller screens play a decisive character in the efficiency of pelletizing circuits and induration furnaces. Unlike vibrating screens, there have been no studies on roller screens to determine their capacity and dimensions. Most studies have utilized the discrete element method (DEM) simulation to assess roller screen performance by employing a spherical shape and the Hertz-Mindlin elastic model. However, this approach is unsuitable due to green pellets’ non-spherical shape and elastic–plastic properties. This study introduces the incorporation of the actual shape of green pellets and a hysteretic spring elastoplastic contact model. In this research work, a novel design of rolls with a grooved surface was recommended for the first time, resulting in a Total Screening Efficiency (TSE) of 96.4% compared to 87.1% for rolls with a smooth surface. Additionally, while exploring the impact of the decks number on the roller screen, a new design, known as the banana roller screen, was introduced. Under similar conditions, the TSE increased by 1.22% compared to the general roller screen type. It was also found that the roller screen’s capacity is directly related to the diameter, speed of rotation, and the number of rolls, while it has a reverse relationship with TSE and deck angle.

辊筛对造粒回路和硬化炉的效率起着决定性作用。与振动筛不同，目前还没有关于滚筒筛的研究来确定其能力和尺寸。大多数研究采用离散元素法 (DEM) 模拟，通过球形和赫兹-明德林弹性模型来评估滚筒筛的性能。然而，由于绿色颗粒的非球形形状和弹塑性特性，这种方法并不适用。本研究引入了绿颗粒的实际形状和滞后弹簧弹塑性接触模型。在这项研究工作中，首次推荐了一种带有凹槽表面的新型轧辊设计，其总筛分效率（TSE）为 96.4%，而光滑表面轧辊的总筛分效率为 87.1%。此外，在探索甲板数对滚筒筛的影响时，还引入了一种新设计，即香蕉滚筒筛。在类似条件下，TSE 比普通辊筛增加了 1.22%。研究还发现，滚筒筛的处理能力与直径、旋转速度和辊数直接相关，而与 TSE 和甲板角度的关系则相反。

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引用次数: 0

Anticorrosive pigment for smart and green protective coatings: An alkyd resin coating incorporating lanthanum-loaded hydroxyapatite, derived from a phosphate mining industry by-product 用于智能绿色防护涂料的防腐颜料：掺入了从磷矿开采业副产品中提取的羟基磷灰石镧的醇酸树脂涂料

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2024-09-21 DOI: 10.1016/j.apt.2024.104666

Mohammad Elmourabit , Youssef Zarki , Brahim Arfoy , Ibrahim Allaoui , Ahmed AitAghzzaf , Abdelmonaim Azzouz , Dounia Bouchta , Faiza Chaouket , Khalid Draoui

Intelligent anti-corrosive coatings have gained considerable interest as a method to protect metals. This approach offers an effective strategy for mitigating corrosion by providing advanced control over the process. In this research, lanthanum-loaded hydroxyapatite pigment (La-HAp) was successfully synthesized using phosphate sludge (PS) waste. The pigment was incorporated into an alkyd resin coating to provide smart corrosion protection for mild steel exposed to a saline solution. The synthesized pigments were characterized using various analytical techniques, including FTIR, XRD, and SEM−EDS. The inhibitory performance of La-HAp on mild steel submerged in a 3% NaCl solution was evaluated using linear polarization and EIS techniques. The findings demonstrated substantial inhibitory effectiveness, achieving 82% inhibition efficiency. Further investigation compared the protective capabilities of modified (C-La-HAp) and reference (C-Ref) alkyd coatings on carbon steel using EIS. The results indicated significant corrosion protection enhancement with 5% La-HAp, showing a polarization resistance of 19.7 MΩ·cm² after four weeks of immersion in the aggressive solution. This corrosion resistance is primarily attributed to the formation of a barrier against the corrosive environment and the trapping of Cl^- ions by the HAp, accompanied by the release of La, phosphate, and calcium ions. La ions react with OH^- ions produced in the cathodic zones to form a uniform protective layer of Lahydroxides, while iron orthophosphates provide additional protection at anodic sites. This synergistic blend of mechanisms imparts intelligent corrosion-inhibiting properties to the alkyd resin, effectively guarding against the damaging effects of corrosive agents.

智能防腐蚀涂层作为一种保护金属的方法，已经引起了人们的极大兴趣。这种方法通过提供对腐蚀过程的先进控制，为减轻腐蚀提供了一种有效的策略。在这项研究中，利用磷酸盐污泥（PS）废料成功合成了负载镧的羟基磷灰石颜料（La-HAp）。该颜料被加入醇酸树脂涂层中，为暴露在盐溶液中的低碳钢提供智能腐蚀保护。利用傅立叶变换红外光谱、XRD 和 SEM-EDS 等多种分析技术对合成的颜料进行了表征。使用线性极化和 EIS 技术评估了 La-HAp 对浸没在 3% NaCl 溶液中的低碳钢的抑制性能。研究结果表明，La-HAp 具有显著的抑制效果，抑制效率达到 82%。进一步的研究使用 EIS 比较了改性（C-La-HAp）和参考（C-Ref）醇酸树脂涂层对碳钢的保护能力。结果表明，5% La-HAp 的腐蚀保护能力明显增强，在侵蚀性溶液中浸泡四周后，极化电阻为 19.7 MΩ-cm2。这种耐腐蚀性主要归因于对腐蚀性环境形成的屏障和 HAp 对 Cl- 离子的捕获，以及 La、磷酸盐和钙离子的释放。La 离子与阴极区产生的 OH 离子反应，形成一层均匀的氢氧化铝保护层，而正磷酸盐铁则在阳极部位提供额外的保护。这种协同作用机制使醇酸树脂具有智能缓蚀特性，可有效抵御腐蚀介质的破坏作用。

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引用次数: 0

Computational fluid dynamics (CFD) simulation of CO2 methanation in a shell-and-tube reactor with boiling water cooling 沸水冷却壳管式反应器中的二氧化碳甲烷化计算流体动力学（CFD）模拟

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2024-09-21 DOI: 10.1016/j.apt.2024.104671

Yonghui Li, Jinxuan An, Sheng Wang, Zhongfeng Geng, He Dong

CO₂ methanation plays a crucial role in carbon cycling and CCU technologies. However, this reaction is highly exothermic, thus requiring significant thermal management. In this investigation, the DEM method was employed to construct a realistic packed bed structure, allowing for the quantification of the radial particle distribution and radial activity ratio. The influence of internal diffusion on the methanation process was simulated using a single-particle model. Building on this, a single shell-and-tube reactor model with a three-dimensional geometric structure was developed. Boiling water was used as the coolant to simulate the reaction and heat transfer processes within the CO₂ methanation reactor. The effects of inert particles, feed flow rate, H₂/CO₂ feed ratio, and operating pressure on the reaction and heat transfer processes were investigated. This study provides important theoretical and technical support for the design optimization and industrial application of CO₂ methanation reactors.

二氧化碳甲烷化在碳循环和 CCU 技术中起着至关重要的作用。然而，这种反应具有高放热性，因此需要大量的热管理。在这项研究中，采用 DEM 方法构建了一个逼真的填料床结构，从而可以量化径向颗粒分布和径向活性比。使用单颗粒模型模拟了内部扩散对甲烷化过程的影响。在此基础上，开发了具有三维几何结构的单壳管反应器模型。用沸水作为冷却剂来模拟二氧化碳甲烷化反应器内的反应和传热过程。研究了惰性颗粒、进料流速、H2/CO2 进料比和操作压力对反应和传热过程的影响。该研究为二氧化碳甲烷化反应器的设计优化和工业应用提供了重要的理论和技术支持。

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引用次数: 0

Investigating the microstructure of chickpea and navy bean flour blends produced by roller milling: Insights from Fourier transform mid-infrared spectroscopy, scanning electron microscopy and synchrotron X-ray techniques 研究辊碾法生产的鹰嘴豆和海军豆混合粉的微观结构：傅立叶变换中红外光谱、扫描电子显微镜和同步辐射 X 射线技术的启示

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2024-09-20 DOI: 10.1016/j.apt.2024.104674

Chitra Sivakumar , Jarvis A. Stobbs , Kaiyang Tu , Chithra Karunakaran , Jitendra Paliwal

Flour blending ratios influence the micro- and molecular properties of flour, which, in turn, determine the essential structure-function relationships crucial for shaping ingredient functionality and creating customized end-products. Conventional laboratory-scale X-ray instruments, constrained by limited brightness and measurement time, present obstacles in investigating porosity, starch lamellar structure, and crystallinity in pulse flours. To address these challenges, this study uses synchrotron X-rays, laser diffraction, mid-infrared spectroscopy, and scanning electron microscopy to non-invasively examine micro and molecular changes in roller-milled chickpea and navy bean flour, accounting for flour blending ratios. The results illustrate a multimodal particle size distribution curve, with each flour blend displaying a distinctive morphology. Chickpea blends showed greater overall porosity than navy bean blends, while navy bean flour blends displayed slightly higher absorbance ratios. The macromolecular changes in flour properties as a result of blending unravel novel information that will be of immense use to food manufacturers.

面粉的混合比例会影响面粉的微观和分子特性，而这些特性反过来又决定了基本的结构-功能关系，这对形成配料功能和创造定制的最终产品至关重要。传统实验室规模的 X 射线仪器受限于有限的亮度和测量时间，在研究脉冲面粉的孔隙率、淀粉层状结构和结晶度方面存在障碍。为了应对这些挑战，本研究使用同步辐射 X 射线、激光衍射、中红外光谱和扫描电子显微镜，在考虑面粉混合比例的情况下，对辊磨鹰嘴豆和海军豆面粉的微观和分子变化进行无损检测。结果显示了多模式粒度分布曲线，每种混合面粉都显示出独特的形态。蚕豆混合粉的整体孔隙率高于藏青豆混合粉，而藏青豆混合粉的吸水率略高。混合后面粉特性的大分子变化揭示了新的信息，对食品制造商大有裨益。

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引用次数: 0

Corrigendum to “Prediction of particle mixing time in a rotary drum by 2D DEM simulations and cross-correlation” [Adv. Powder Technol. 33(4) (2022) 103512] 通过二维 DEM 模拟和交叉相关性预测旋转滚筒中的颗粒混合时间"[Adv. Powder Technol.

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2024-09-20 DOI: 10.1016/j.apt.2024.104676

W. Wu, K. Chen, E. Tsotsas

引用次数: 0

Development of granular neutral amino acids with calcium hydroxide composition 开发含有氢氧化钙成分的颗粒状中性氨基酸

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2024-09-19 DOI: 10.1016/j.apt.2024.104645

Min Kyung Kwon , Jun-Woo Kim , In Sung Lee , DongHyun Lee

Amino acid granules for animal feed are typically produced by fermentation, evaporation and fluidized bed granulation with drying processes. Evaporation is one of the most energy-efficient processes to remove water. However, a fluidized bed granulation process with drying is a relatively energy-inefficient process to remove water. Improving solubility of amino acid is good strategy to increase the maximum achievable concentration in the evaporation process. An increase in the maximum achievable concentration can lead to energy saving by increasing the contribution of water removal by evaporation. In this study, a manufacturing method of neutral amino acid granule for feed additive using calcium hydroxide addition was developed. Since solubility of neutral amino acid is increased with increasing amount of calcium hydroxide, adding calcium hydroxide is a useful method to improve energy efficiency of the evaporation process. It was found that adding calcium hydroxide reduced steam consumption levels of tryptophan, threonine, valine and isoleucine by 8.0%, 28.0%, 26.3% and 15.6%, respectively.

动物饲料用氨基酸颗粒通常通过发酵、蒸发和流化床造粒加干燥工艺生产。蒸发是去除水分最节能的工艺之一。然而，带干燥的流化床造粒工艺是一种能效相对较低的除水工艺。提高氨基酸的溶解度是增加蒸发过程中可达到的最大浓度的好策略。提高最大可达到浓度可以通过增加蒸发脱水的贡献来实现节能。本研究开发了一种使用氢氧化钙添加剂生产饲料添加剂用中性氨基酸颗粒的方法。由于中性氨基酸的溶解度随氢氧化钙用量的增加而增加，因此添加氢氧化钙是提高蒸发过程能效的有效方法。研究发现，添加氢氧化钙可使色氨酸、苏氨酸、缬氨酸和异亮氨酸的蒸汽消耗量分别减少 8.0%、28.0%、26.3% 和 15.6%。

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引用次数: 0