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Influence of mineral filler characteristics on the filler–asphalt interfacial behavior 矿物填料特性对填料-沥青界面行为的影响
IF 4.2 2区 工程技术 Q2 ENGINEERING, CHEMICAL Pub Date : 2024-08-27 DOI: 10.1016/j.apt.2024.104636
Baodong Xing , Chen Fang , Xiaobo Lyu , Weiyu Fan , Yuchao Lyu

The knowledge of mineral filler characteristics and their impacts on filler–asphalt interfacial behavior is not systematic and completed yet. In this paper, eight mineral fillers prepared using the same milling procedure were investigated. The filler–asphalt interfacial behavior was analyzed by differential scanning calorimetric and dynamic shear rheometer tests. Results reveal that in contrast to form factor and specific surface area, particle porosity, particle density, aspect ratio, angularity index, fractal dimension and feature roughness decrease with decreasing particle size. Limestone filler exhibits more regular shape, less significant angularity and richer surface texture than basalt filler. Of all particle characteristics studied, form factor and specific surface area are suggested to be the determining factors affecting filler–asphalt interfacial behavior. Moreover, microscopic morphology analysis provides an insight to interpret the differences explored in mastic interfacial property. The results help employ applicable particle characteristics that fabricate mastic with a stable interface system.

有关矿物填料特性及其对填料-沥青界面行为影响的知识还不够系统和完整。本文研究了使用相同研磨程序制备的八种矿物填料。通过差示扫描量热和动态剪切流变仪测试分析了填料与沥青的界面行为。结果表明,与形状系数和比表面积相反,颗粒孔隙率、颗粒密度、长宽比、角度指数、分形维度和特征粗糙度随着颗粒尺寸的减小而减小。与玄武岩填料相比,石灰石填料的形状更规则,棱角更不明显,表面纹理更丰富。在研究的所有颗粒特征中,形状系数和比表面积被认为是影响填料-沥青界面行为的决定性因素。此外,显微形态分析还为解释胶泥界面特性的差异提供了一种见解。这些结果有助于采用适用的颗粒特性来制造具有稳定界面系统的胶泥。
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引用次数: 0
Simple and sustainable synthesis of loosely stacked nano-H-ZSM-5 aggregates from kaolin and catalytic studies 从高岭土中简单、可持续地合成松散堆积的纳米 H-ZSM-5 聚集体并进行催化研究
IF 4.2 2区 工程技术 Q2 ENGINEERING, CHEMICAL Pub Date : 2024-08-27 DOI: 10.1016/j.apt.2024.104635
Hu Wen , Yuxin Li , Haitao Yin , Wei Wang , Zhengchao Jin , Shunyu Han , Nanzhe Jiang

The conversion of natural clay to crystalline zeolites has been the subject of considerable interest from both academic and industrial circles. We present an effective strategy for converting kaolin to ZSM-5 zeolite, addressing the issue of reduced mesopore formation in conventional nano-ZSM-5 aggregates due to close-packing. This strategy utilizes kaolin as the sole source of silicon and aluminum, and by decoupling the nucleation and growth of ZSM-5 crystals, loosely stacked nano-H-ZSM-5 aggregates with high crystallinity crystals can be synthesized in a solid-like system by employing a tiny amount of TPAOH (TPAOH/SiO2 = 0.064). The resulting nano-H-ZSM-5 aggregates exhibited high specific surface area (405.66 m2/g), high mesopore volume (0.64 cm3/g), and superior catalytic activity. This strategy offers a novel approach to the cost-effective synthesis of nano-H-ZSM-5 aggregates suitable for industrial applications.

将天然粘土转化为结晶沸石一直是学术界和工业界相当感兴趣的课题。我们提出了一种将高岭土转化为 ZSM-5 沸石的有效策略,解决了传统纳米 ZSM-5 聚合物因紧密堆积而导致中孔形成减少的问题。该策略利用高岭土作为硅和铝的唯一来源,通过将 ZSM-5 晶体的成核和生长分离开来,只需使用极少量的 TPAOH(TPAOH/SiO2 = 0.064),就能在类固体体系中合成具有高结晶度晶体的松散堆积纳米 H-ZSM-5 聚集体。所得到的纳米 H-ZSM-5 聚合物具有高比表面积(405.66 m2/g)、高介孔体积(0.64 cm3/g)和卓越的催化活性。该策略为经济高效地合成适合工业应用的纳米 H-ZSM-5 聚合物提供了一种新方法。
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引用次数: 0
Exploring the disintegration mechanism of dissolved natural plant products tablets based on pore structure control 基于孔隙结构控制的天然植物溶解片剂崩解机理探索
IF 4.2 2区 工程技术 Q2 ENGINEERING, CHEMICAL Pub Date : 2024-08-23 DOI: 10.1016/j.apt.2024.104586
Zhenda Liu , Xiao Lin , Yanlong Hong , Lijie Zhao , Lan Shen

Porosity variations have an impact on the disintegration behavior of tablets whereas the influence on the disintegration characteristics of natural plant product (NPP) tablets has not been extensively studied. Revealing the pore structure of NPP tablets provides a new and important clue to elucidate the phenomenal behavior and underlying mechanisms of tablet disintegration. In this study, the effect of porosity variation on disintegration of NPP tablets was evaluated for the first time. The disintegration performance of NPP tablets was evaluated using tablet attributes, disintegration kinetics, and the wicking process. Mercury intrusion porosimetry (MIP) and X-ray computed microtomography (XμCT) were used to characterize the microstructure of the tablets. Curcuma Longa Linn. extractions were compacted into tablets with different solid fractions. Tablet qualities changed significantly with increasing porosity. An increase in the wicking rate with porosity changed by visualizing the wicking process. The disintegration kinetics of tablets showed a sensitive variation after an increase in porosity. The pore structure of tablets including parameters such as pore size distribution, tortuosity, and connectivity were identified as direct drivers of wicking and disintegration. The current study provides new insights into the disintegration mechanism of dissolved NPP tablets by exploring the evolution of the pore microstructure.

孔隙率变化对片剂的崩解行为有影响,但对天然植物产品(NPP)片剂崩解特性的影响还没有广泛的研究。揭示 NPP 片剂的孔隙结构为阐明片剂崩解的现象行为和内在机制提供了新的重要线索。本研究首次评估了孔隙率变化对 NPP 片剂崩解的影响。通过片剂属性、崩解动力学和吸水过程对 NPP 片剂的崩解性能进行了评估。汞侵入孔测定法(MIP)和 X 射线计算机显微层析技术(XμCT)用于表征片剂的微观结构。将莪术提取物压制成不同固体组分的片剂。随着孔隙率的增加,片剂的质量发生了明显变化。通过目测吸水过程,吸水率随孔隙率的增加而变化。片剂的崩解动力学在孔隙率增加后出现了敏感变化。片剂的孔隙结构(包括孔径分布、迂回度和连通性等参数)被确定为舔噬和崩解的直接驱动因素。本研究通过探索孔隙微观结构的演变,对溶解的 NPP 片剂的崩解机制提供了新的见解。
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引用次数: 0
Microstructural evolution and mechanical behavior of WC–4wt.%TiC–3wt.%TaC–12wt.%Co refractory cermet consolidated by spark plasma sintering of mechanically activated powder mixtures 机械活化粉末混合物经火花等离子烧结固结成的 WC-4wt.%TiC-3wt.%TaC-12wt.%Co 耐火金属陶瓷的微观结构演变和机械性能
IF 4.2 2区 工程技术 Q2 ENGINEERING, CHEMICAL Pub Date : 2024-08-21 DOI: 10.1016/j.apt.2024.104625
I.Yu. Buravlev , O.O. Shichalin , A.A. Belov , P.A. Marmaza , E.S. Kolodeznikov , M.I. Dvornik , A.N. Sakhnevich , A.A. Buravleva , S.V. Chuklinov , E.K. Papynov

The paper studied the structural features and physicomechanical properties of the WC–4wt.%TiC–3wt.%TaC–12wt.%Co composite refractory hard alloy system obtained by spark plasma sintering (SPS) from a preliminarily mechanically activated powder. It has been shown that preliminary mechanical activation in a planetary mill contributed to the comminution of agglomerates and the formation of a monomodal particle size distribution with a predominance of the submicron fraction, which intensifies the densification processes during subsequent consolidation by the SPS method. Kinetic analysis of the SPS process showed a two-stage sintering pattern with intense densification at temperatures above 790 °C due to rearrangement of WC, TiC, TaC particles and melting of the cobalt binder. It has been found that the SPS method does not lead to the formation of undesirable secondary phases in the entire sintering temperature range. A sintering temperature of 1200 °C is optimal for achieving the best structural homogeneity, density and mechanical properties, providing optimal distribution of carbide phases and the cobalt binder. The microstructure of the sample obtained at 1200 °C represents a refractory skeleton of WC grains with TiC and TaC carbide particles uniformly distributed throughout the volume. Improved fluidity of the melted cobalt binder and its mobile redistribution contribute to increased compactness of the structure and reduced porosity of the material. Samples sintered at 1200 °C possess high physicomechanical characteristics: relative density 99.99 %, hardness HV30 1623.2, bending strength 1125.1 MPa, fracture toughness 10.5 MN⋅m1/2. The abrasive wear resistance of a newly synthesized hard material was evaluated through a turning operation. Results showed durability, indicating promise for cutting tool applications and the need for further research to fully characterize the performance of this novel material.

本文研究了从初步机械活化粉末中通过火花等离子烧结(SPS)获得的 WC-4wt.%TiC-3wt.%TaC-12wt.%Co 复合难熔硬质合金体系的结构特征和物理机械性能。研究表明,行星磨中的初步机械活化有助于团聚体的粉碎,并形成以亚微米部分为主的单模态粒度分布,从而在随后的 SPS 方法固结过程中强化了致密化过程。对 SPS 过程的动力学分析表明,由于 WC、TiC、TaC 颗粒的重新排列和钴粘结剂的熔化,烧结模式分为两个阶段,在温度高于 790 ℃ 时会产生强烈的致密化。研究发现,在整个烧结温度范围内,SPS 方法都不会导致不良次生相的形成。1200 °C 的烧结温度最适合实现最佳的结构均匀性、密度和机械性能,并提供碳化物相和钴粘结剂的最佳分布。在 1200 °C 下获得的样品微观结构是由 WC 晶粒组成的耐火骨架,TiC 和 TaC 碳化物颗粒在整个体积中均匀分布。熔融钴粘结剂流动性的改善及其移动性的重新分布有助于提高结构的致密性和降低材料的孔隙率。在 1200 °C 下烧结的样品具有很高的物理机械特性:相对密度 99.99 %、硬度 HV30 1623.2、抗弯强度 1125.1 MPa、断裂韧性 10.5 MN-m1/2。通过车削操作评估了新合成硬质材料的耐磨性。结果表明,这种材料具有耐磨性,有望应用于切削工具,同时也表明有必要开展进一步研究,以全面鉴定这种新型材料的性能。
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引用次数: 0
Investigation of pullulan polysaccharide as a sphalerite depressant for chalcopyrite separation: Flotation behavior and interfacial adsorption mechanism 研究作为闪锌矿抑制剂用于黄铜矿分离的乌拉坦多糖:浮选行为和界面吸附机制
IF 4.2 2区 工程技术 Q2 ENGINEERING, CHEMICAL Pub Date : 2024-08-21 DOI: 10.1016/j.apt.2024.104621
Qilin Zhai, Yuwei Hu, Runqing Liu, Wei Sun

The remarkable differences in the metallurgical processes of copper and zinc require their host minerals to be separated as far as possible during beneficiation. For chalcopyrite and sphalerite, the primary host minerals of copper and zinc, their green and efficient separation in the beneficiation stage remains a great challenge. This work is the first to employ environmentally friendly pullulan polysaccharide (PP) as a sphalerite depressant to assist in the concentration of chalcopyrite. Flotation experiments have revealed that PP possesses a selective depression action on sphalerite without having a large influence on the recovery of chalcopyrite. Characterization analysis has revealed that PP can be adsorbed onto chalcopyrite and sphalerite surfaces, but with a different response to subsequent sorption collectors. PP adsorbs to the Zn atoms on sphalerite surfaces via its O atoms in the C−O−H group and thus prevents the adsorption of sodium butyl xanthate (BX). The Fe sites on the chalcopyrite surface can adsorb PP, but this process does not affect the BX adsorption as the Cu sites remain exposed. Hence, PP can enhance the hydrophilicity of sphalerite without interfering with the hydrophobicity of chalcopyrite, resulting in a desirable separation effect. Overall, this work offers a promising scheme for the concentration of chalcopyrite from sphalerite during beneficiation, thereby contributing to the efficient exploitation of copper and zinc resources.

铜和锌在冶金过程中的显著差异要求在选矿过程中尽可能分离它们的主矿物。对于铜和锌的主要主矿物黄铜矿和闪锌矿来说,在选矿阶段对它们进行绿色、高效的分离仍然是一个巨大的挑战。这项研究首次采用环境友好型拉氏多糖(PP)作为闪锌矿抑制剂,以帮助黄铜矿的选矿。浮选实验表明,PP 对闪锌矿具有选择性抑制作用,但对黄铜矿的回收率影响不大。特征分析表明,聚丙烯可以吸附在黄铜矿和闪锌矿表面,但对后续吸附收集器的反应不同。聚丙烯通过其 C-O-H 基团中的 O 原子吸附到闪锌矿表面的 Zn 原子上,从而阻止了黄原酸丁酯钠(BX)的吸附。黄铜矿表面的铁位点可以吸附 PP,但这一过程不会影响对 BX 的吸附,因为铜位点仍然暴露在外。因此,PP 可以增强闪锌矿的亲水性,而不会影响黄铜矿的疏水性,从而产生理想的分离效果。总之,这项工作为在选矿过程中从闪锌矿中浓缩黄铜矿提供了一个前景广阔的方案,从而有助于铜锌资源的有效开发。
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引用次数: 0
High-performance FeSiAl/(Al2O3-Ni) soft magnetic composites prepared by in situ synthesis method 原位合成法制备的高性能 FeSiAl/(Al2O3-Ni)软磁复合材料
IF 4.2 2区 工程技术 Q2 ENGINEERING, CHEMICAL Pub Date : 2024-08-19 DOI: 10.1016/j.apt.2024.104624
Zigui Luo , Qi Jin , Rui Wang , Zhenjia Yang , Zhaoyang Wu , Guangqiang Li , Xi’an Fan

FeSiAl/(Al2O3-Ni) soft magnetic composites (SMCs) were prepared by sintering FeSiAl/NiO composite powders, and the formation mechanism of the Al2O3-Ni composite coating and performance of the FeSiAl SMCs with different NiO coating content were studied. During sintering, high temperature promoted a reaction between Al and NiO at the FeSiAl/NiO interface, resulting in the in-situ formation of a composite coating comprising Al2O3 coating with high integrity and ferromagnetic Ni coating. The interdiffusion of Al and O2– toward the interface ensured the continuation of the reaction and growth of the composite coating. The composite coating thickened with the increasing NiO coating content, thus showing reduced real part of permeability. Saturation magnetization considerably increased until the NiO coating content exceeded 12.5 wt% owing to residual NiO. Excessive NiO coating content led to the generation of a large amount of Ni, which was not conducive to the integrity of the Al2O3 coating and increased magnetic loss. The FeSiAl SMCs with 5.0 wt% NiO coating content exhibited exceptional performance with high saturation magnetization (135.3 emu/g), good frequency stability of permeability, and low magnetic loss (63.7 W/kg at 0.05 T/20 kHz).

通过烧结 FeSiAl/NiO 复合粉末制备了 FeSiAl/(Al2O3-Ni)软磁复合材料(SMC),并研究了 Al2O3-Ni 复合涂层的形成机理以及不同 NiO 涂层含量的 FeSiAl SMC 的性能。在烧结过程中,高温促进了 Al 和 NiO 在 FeSiAl/NiO 界面的反应,从而在原位形成了由具有高完整性的 Al2O3 涂层和铁磁性 Ni 涂层组成的复合涂层。Al 和 O2- 向界面的相互扩散确保了反应的持续进行和复合涂层的生长。复合镀层随着氧化镍镀层含量的增加而增厚,从而显示出实际磁导率的降低。由于残余氧化镍的存在,饱和磁化率在氧化镍涂层含量超过 12.5 wt% 时显著增加。氧化镍涂层含量过高会产生大量的镍,不利于 Al2O3 涂层的完整性,并增加磁损。NiO 涂层含量为 5.0 wt% 的 FeSiAl SMC 具有优异的性能,饱和磁化率高(135.3 emu/g),磁导率频率稳定性好,磁损耗低(0.05 T/20 kHz 时为 63.7 W/kg)。
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引用次数: 0
An analytical scaling law model framework for short-time dust emission from belt conveyor 带式输送机短时粉尘排放的分析缩放规律模型框架
IF 4.2 2区 工程技术 Q2 ENGINEERING, CHEMICAL Pub Date : 2024-08-17 DOI: 10.1016/j.apt.2024.104613
C.Y. Wang , L. Fang

Aiming at explaining the short-time dust emission from belt conveyors, an analytical scaling law model framework is introduced, employing the same assumptions and wall models as traditional numerical simulations. Further, assuming a piecewise mean velocity profile, the Lagrangian mean velocity of dust particles can be written as a general expression. This expression is validated in various cases, including the 2D Belt, 3D Belt, 2D Tire, and 3D Tire cases. Numerical results show that the theoretical prediction, with key parameters fixed at us=5,κ=0.4187, and E=9.793, fits well with the simulated Lagrangian mean velocity profiles. For example, in the 2D Belt case, short-time agreement is achieved within t1 s, indicating the model’s effectiveness in predicting dust dispersion within this time frame.

为了解释带式输送机的短时粉尘排放,本文引入了一个分析缩放定律模型框架,采用了与传统数值模拟相同的假设和壁面模型。此外,假定存在片断平均速度剖面,粉尘颗粒的拉格朗日平均速度可以写成一般表达式。该表达式在各种情况下都得到了验证,包括二维带状、三维带状、二维轮胎和三维轮胎情况。数值结果表明,在关键参数固定为 us=5、κ=0.4187 和 E=9.793 的情况下,理论预测结果与模拟的拉格朗日平均速度曲线非常吻合。例如,在 2D Belt 案例中,在 t⩽1 秒内实现了短时吻合,这表明该模型能有效预测该时间范围内的尘埃弥散。
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引用次数: 0
Investigation on particle size and packing tortuosity by coupling image analysis and permeability tests 通过图像分析和渗透性测试耦合研究颗粒尺寸和填料迂回度
IF 4.2 2区 工程技术 Q2 ENGINEERING, CHEMICAL Pub Date : 2024-08-16 DOI: 10.1016/j.apt.2024.104622
Silvia Volpato, Andrea C. Santomaso

This experimental study aims to enhance the understanding of the correlation among equivalent particle diameters measured using two analytical techniques: optical analysis (assisted by computer aided image analysis) and permeability tests. The presence or absence of a specific analytical method or instrument can lead to the use of an incorrect equivalent diameter. Therefore, it can be beneficial to establish conversion rules between different equivalent particle diameters obtained through various methods and instruments. The optical analysis returns an equivalent diameter value inherently independent of particle arrangement since it deals with isolated particles. In contrast, the permeability test offers an equivalent mean diameter dependent not only on the size of the particles but also on their packed arrangement. A suitable correlation between the two diameters has been proposed, shown to be a decreasing function of porosity following a power law.

An unexpected outcome of the comparison between the optical method and permeametry is the possibility to isolate and characterize the effect that the packing arrangement has on pressure losses and to characterize it in terms of the tortuosity of the path that the fluid must travel through the packed bed. Our findings confirm a strong alignment between our tortuosity model, which contains the ratio between the two equivalent diameters considered here, and an empirical correlation from literature often utilized for predicting packed bed tortuosity.

本实验研究旨在加强对使用两种分析技术测量的等效颗粒直径之间相关性的理解:光学分析(计算机辅助图像分析辅助)和渗透性测试。特定分析方法或仪器的存在与否会导致使用不正确的等效直径。因此,在通过不同方法和仪器获得的不同等效颗粒直径之间建立换算规则是有益的。光学分析得出的等效直径值与颗粒排列无关,因为它处理的是孤立的颗粒。相比之下,渗透性测试提供的等效平均直径不仅取决于颗粒的大小,还取决于它们的排列方式。光学方法和渗透率测试法之间的比较产生了一个意想不到的结果,那就是可以分离和描述填料排列对压力损失的影响,并根据流体必须通过填料床的路径的迂回程度来描述这种影响。我们的研究结果证实,我们的曲折度模型与文献中经常用于预测填料床曲折度的经验相关性非常吻合。
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引用次数: 0
Oxidative foaming plus in-situ activation and template synthesis of hierarchical porous carbon for high-performance supercapacitors 氧化发泡加原位活化和模板合成用于高性能超级电容器的分层多孔碳
IF 4.2 2区 工程技术 Q2 ENGINEERING, CHEMICAL Pub Date : 2024-08-16 DOI: 10.1016/j.apt.2024.104617
Boyang Liu , Chenglong Li , Xuejin Chen , Junchen Chen , Yun Zhou , Kai Sun , Runhua Fan , Dechang Jia

This study presents an innovative approach for synthesizing hierarchical porous carbon materials (HPCMs) tailored for high-performance supercapacitors. The proposed method combines oxidative foaming with self-activation, in-situ template, in-situ activation and template synthesis, respectively, utilizing glucose reactions with oxidizing agents like ammonium persulfate (APS), magnesium nitrate hexahydrate (MNH), and potassium persulfate (KPS). The process involves two stages: low-temperature foaming to initiate macropore formation and high-temperature annealing to create meso/micropores through in-situ template and activation. Generally, increasing the ratio of oxidant to glucose in the synthesis process can notably enhance the high specific surface area and pore volume of the HPCMs with a combination of micro/meso/macropores, exhibiting maximum values of 821 m2/g and 0.61 cm3/g (APS), 2077 m2/g and 3.05 cm3/g (MNH), 1845 m2/g and 1.29 cm3/g (KPS), respectively. Furthermore, the O and N, or S elements, can also be in-situ doped in the carbon framework. The hierarchical porous structure and the doping elements enhance the electrochemical performance of supercapacitors. The APS@4, with a high mass loading of 3.2 mg/cm2, exhibits a superior specific capacitance of 144 F/g and an areal capacitance of 456 mF/cm2 at a current density of 1 A/g. It demonstrates excellent cycling stability based on a capacitance retention of 100 % after 10,000 cycles.

本研究提出了一种合成高性能超级电容器专用分层多孔碳材料(HPCMs)的创新方法。所提出的方法将氧化发泡与自活化、原位模板、原位活化和模板合成相结合,分别利用葡萄糖与过硫酸铵(APS)、六水硝酸镁(MNH)和过硫酸钾(KPS)等氧化剂发生反应。该工艺包括两个阶段:低温发泡,启动大孔形成;高温退火,通过原位模板和活化形成中孔/微孔。一般来说,在合成过程中增加氧化剂与葡萄糖的比例,可显著提高具有微孔/中孔/大孔组合的 HPCM 的高比表面积和孔体积,其最大值分别为 821 平方米/克和 0.61 立方厘米/克(APS)、2077 平方米/克和 3.05 立方厘米/克(MNH)、1845 平方米/克和 1.29 立方厘米/克(KPS)。此外,还可以在碳框架中原位掺入 O 和 N 或 S 元素。分层多孔结构和掺杂元素提高了超级电容器的电化学性能。APS@4 的质量负荷高达 3.2 mg/cm2,在电流密度为 1 A/g 时,比电容高达 144 F/g,面积电容为 456 mF/cm2。根据 10,000 次循环后 100 % 的电容保持率计算,它具有出色的循环稳定性。
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引用次数: 0
Adsorption and depression mechanism of carrageenan on chalcopyrite and pyrite for the efficiency flotation separation 卡拉胶在黄铜矿和黄铁矿上的吸附和抑制机制促进高效浮选分离
IF 4.2 2区 工程技术 Q2 ENGINEERING, CHEMICAL Pub Date : 2024-08-16 DOI: 10.1016/j.apt.2024.104615
Huifang Yang , Xiaoyu Cao , Jihui Luo , Jianxian Zeng , Xiaoping Huang , Jianrong Xue , Sheng Liu

In this study, an eco-friendly compound, carrageenan, was employed as a depressant for the selective separation of chalcopyrite and pyrite. The depressant performance and mechanism were comprehensively investigated. The results of the flotation experiments demonstrated that carrageenan exhibited selective depression towards pyrite as opposed to chalcopyrite, achieving flotation recoveries of 88.57 % for chalcopyrite and 9.57 % for pyrite with the combination of 2 × 10-5 mol/L SIBX and 20 mg/L carrageenan. The results of AFM and contact angle measurements revealed that carrageenan exhibited selective adsorption on pyrite surface, resulting in an enhancement in surface hydrophilicity. In contrast, the adsorption of carrageenan on chalcopyrite surface was found to be negligible. Zeta potential and XPS analyses further confirmed the chemisorption of carrageenan on the pyrite surface, indicating the reaction involving sulfuric acid and hydroxyl groups on carrageenan and Fe sites on pyrite. Therefore, carrageenan holds potential as a promising depressant for the selective separation of chalcopyrite from pyrite.

本研究采用一种环保型化合物卡拉胶作为抑制剂,用于黄铜矿和黄铁矿的选择性分离。该研究全面考察了抑制剂的性能和机理。浮选实验结果表明,相对于黄铜矿,卡拉胶对黄铁矿具有选择性抑制作用,在 2 × 10-5 mol/L SIBX 和 20 mg/L 卡拉胶的组合下,黄铜矿的浮选回收率为 88.57%,黄铁矿的浮选回收率为 9.57%。原子力显微镜和接触角测量结果表明,卡拉胶在黄铁矿表面表现出选择性吸附,从而增强了表面亲水性。相比之下,黄铜矿表面对卡拉胶的吸附可以忽略不计。Zeta 电位和 XPS 分析进一步证实了卡拉胶在黄铁矿表面的化学吸附,表明硫酸和卡拉胶上的羟基与黄铁矿上的铁位点发生了反应。因此,卡拉胶可作为一种有前途的抑制剂,用于从黄铁矿中选择性地分离黄铜矿。
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引用次数: 0
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