Hydrometallurgy最新文献_第6页

The cyanidation of gold. II. The cathodic reduction of oxygen 氰化金2。氧的阴极还原

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy

Pub Date : 2025-09-30 DOI: 10.1016/j.hydromet.2025.106580

M. Nicol

An extensive study has been undertaken of the reduction of oxygen on various gold electrodes under conditions appropriate to the cyanide leaching of gold. Voltammetric studies with various gold electrodes and ring-disk electrode measurements with pure gold have demonstrated that the 2-step reduction involving peroxide as an intermediate is complex with variable extents of production of peroxide and reduction to water depending on the electrode material and solution purity. There is thus no simple stoichiometry for the reduction of oxygen although the use of a 2-electron reduction is probably the best approximation under plant conditions. This is contrary to the often accepted 4-electron process.

The nature of the gold surface is important with lower reactivity of gold‑silver alloy and plant electrodes relative to pure gold. The sensitivity of oxygen to the presence of underpotentially deposited lead has been demonstrated in solutions contaminated with lead ions. Lead ions have a significant catalytic effect on the kinetics of oxygen reduction that can be attributed to the known effect of underpotentially deposited lead on the reduction of oxygen on gold electrodes in acidic and highly alkaline solutions. Thus, both the anodic dissolution of gold and the cathodic reduction of oxygen are catalysed in the presence of low concentrations of lead ions.

在适合金氰化浸出的条件下，对各种金电极上氧的还原进行了广泛的研究。用各种金电极和用纯金环盘电极测量的伏安研究表明，涉及过氧化物作为中间体的两步还原是复杂的，根据电极材料和溶液纯度，过氧化氢的产生和还原到水的程度是不同的。因此，氧的还原没有简单的化学计量学，尽管在植物条件下，使用双电子还原可能是最好的近似。这与通常被接受的4电子过程相反。金表面的性质是重要的，与纯金相比，金银合金和植物电极的反应性较低。氧对潜在沉积铅的敏感性已经在铅离子污染的溶液中得到证实。铅离子对氧还原动力学具有显著的催化作用，这可以归因于已知的在酸性和高碱性溶液中欠电位沉积的铅对金电极上氧的还原的影响。因此，在低浓度铅离子的存在下，金的阳极溶解和氧的阴极还原都被催化。

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引用次数: 0

Selective leaching of arsenic from zinc oxide dust in NaOH-(NH2)2CS solution NaOH-(NH2)2CS溶液中氧化锌粉尘中砷的选择性浸出

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy

Pub Date : 2025-09-29 DOI: 10.1016/j.hydromet.2025.106577

Faxin Xiao , Xinyu Cao , Qingwen Ma , Cuixia Yang , Yaru Zhao , Ziqi He , Xuwei Luo , Junqiang Chen , Shuchen Sun , Ganfeng Tu

The selective removal of arsenic from zinc smelting dust is a notable measure toward resource recovery and environmental protection. In this study, a thiourea-assisted alkaline leaching method was employed to selectively extract arsenic from Zn smelting dust. The thermodynamics of arsenic dissolution were investigated first. The effects of NaOH concentration, thiourea concentration, leaching temperature, leaching time, and liquid–solid ratio on arsenic and zinc extraction during alkaline leaching were investigated. The results demonstrated that the addition of thiourea effectively enhanced arsenic extraction from 58.1 % to 77.1 %, while suppressing Zn leaching from 18.4 % to 2.6 %. Under optimal conditions, As, Zn, Fe, Pb, In, and Ag exhibited leaching efficiencies of 77.1 %, 2.6 %, 4.5 %, 2.1 %, 1.3 %, and 3.2 %, respectively, confirming selective arsenic leaching over other elements. Combined XRD, SEM, and XPS characterizations revealed that thiourea facilitated the dissolution of insoluble arsenate minerals and promoted the formation of ZnS and PbS precipitates by releasing S²⁻ into the solution. This process effectively reduced the loss of valuable metals such as Zn and Pb. This method can be used to selectively remove arsenic from As-containing oxidized dust.

锌冶炼粉尘中砷的选择性脱除是资源回收和环境保护的重要措施。采用硫脲辅助碱性浸出法从锌冶炼粉尘中选择性提取砷。首先研究了砷溶解的热力学。考察了碱浸过程中NaOH浓度、硫脲浓度、浸出温度、浸出时间和液固比对砷锌浸出的影响。结果表明，硫脲的加入可有效地将砷的浸出率从58.1%提高到77.1%，同时抑制锌的浸出率从18.4%降低到2.6%。在最佳条件下，As、Zn、Fe、Pb、In和Ag的浸出效率分别为77.1%、2.6%、4.5%、2.1%、1.3%和3.2%，证实了砷对其他元素的选择性浸出。XRD、SEM和XPS表征表明，硫脲通过向溶液中释放S2−，促进了不溶性砷酸盐矿物的溶解，促进了ZnS和PbS沉淀的形成。该工艺有效地减少了锌、铅等贵重金属的损失。该方法可用于选择性地去除含砷氧化粉尘中的砷。

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引用次数: 0

Separation of gallium from acid leachates of zinc smelting slag by tartaric acid coordinated complexation and anion-exchange 酒石酸配位-阴离子交换法分离锌渣酸性浸出液中镓

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy

Pub Date : 2025-09-29 DOI: 10.1016/j.hydromet.2025.106581

Mingwei Qi , Minyu Zhu , Hao Chen , Yun Liu , Zhiqiang Lin , Zezuo Jiang , Jing Wu , Chunlin He

The rapid advancement of strategic technologies, including semiconductor manufacturing, 5G infrastructure, renewable energy systems, and aerospace engineering, has driven a surge in global demand for gallium (Ga). To address this need, secondary resources such as zinc smelting slag have emerged as a critical source for gallium recovery. This study proposes a novel strategy for gallium recovery by leveraging the ligand complexation capability of tartaric acid to convert Ga(OH)₃ into negatively charged complexes([GaO₂(OH)C₄H₂O₄]₂⁴⁻), followed by selective adsorption using a polystyrene-based anion-exchange resin (D201 × 7). The results demonstrated that the maximum adsorption capacity was 138 mg/g at pH 4, T = 328 K, t = 45 min and 1:1 M ratio of tartaric acid with Ga. The adsorption process conformed to the pseudo-second-order kinetic and Langmuir isotherm models. The primary mechanism for the adsorption of Ga(III) involved complexation with tartaric acid to form an anionic species and undergo ion exchange via the Cl⁻ functional groups on the D201 × 7 resin. The column experiment demonstrated highly selective adsorption efficiency of Ga(III) in the presence of various interfering metal ions. This study provides a feasible alternative for the separation of Ga(III) from industrial zinc slag processing in sulfuric acid systems and has broad application prospects.

半导体制造、5G基础设施、可再生能源系统和航空航天工程等战略技术的快速发展，推动了全球对镓（Ga）的需求激增。为了满足这一需求，锌冶炼渣等二次资源已成为镓回收的重要来源。本研究提出了一种新的镓回收策略，利用酒石酸的配体络合能力将Ga(OH)3转化为带负电荷的配合物（[GaO2(OH)C4H2O4]24−），然后使用聚苯乙烯基阴离子交换树脂（D201 × 7）进行选择性吸附。结果表明，在pH为4、温度为328 K、温度为45 min、酒石酸与Ga浓度为1:1的条件下，酒石酸的最大吸附量为138 mg/g。吸附过程符合拟二级动力学模型和Langmuir等温模型。D201 × 7树脂吸附Ga（III）的主要机理是与酒石酸络合形成阴离子，并通过Cl -官能团进行离子交换。柱实验表明，在多种干扰金属离子存在下，镓（III）具有较高的选择性吸附效率。本研究为工业锌渣在硫酸体系中分离镓（III）提供了一种可行的选择，具有广阔的应用前景。

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引用次数: 0

Efficient separation of Al and Fe impurities from La-Ce chloride solution by pH adjustments with ammonium bicarbonate in the presence of triammonium citrate 在柠檬酸三铵存在下，用碳酸氢铵调节pH值，有效分离La-Ce氯化溶液中的Al和Fe杂质

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy

Pub Date : 2025-09-27 DOI: 10.1016/j.hydromet.2025.106578

Yanzhu Liu , Fen Nie , Lihui Liu , Yanrong Ding , Ying Ma , Zhengxiong Ding , Qing Zhao , Yongxiu Li

The separation of aluminum from rare earths (REs) by precipitation using pH adjustments with ammonium bicarbonate (ABC) is not satisfactory because of their co-precipitation, which affects the crystallization and the purity of rare earth carbonate. Therefore, it is extremely challenging to obtain high recovery of REs with high purity due to loss of REs during precipitation. This paper proposes a precipitation method using ABC in the presence of triammonium citrate (TAC) to separate aluminum from lanthanum and cerium. The results show that the removal efficiency of iron and aluminum and the loss of REs due to coprecipitation (%) depend on the dosage of TAC and ABC and the solution pH. A complementary relationship exists between the removal efficiency of aluminum and the loss of REs during precipitation. The optimal dosage of TAC is linear with the concentration of aluminum or the molar ratio of aluminum to iron. It was found that the removal efficiency of iron, aluminum and the loss of REs during precipitation are 100 %, 93 % and 5.6 %, respectively, for an iron‑aluminum ratio of 0.05, and the optimal dosage of TAC is 4–5 % of the aluminum content. After removing the aluminum and iron, the calcined RE₂O₃ product with purity of 99.6 % and aluminum content of 0.31 % was obtained. Compared with the products without purification or purification without the addition of TAC, the purity of RE₂O₃ product increased by 9.31 % and 1.39 %, and the aluminum content decreased by 1.99 % and 0.78 % respectively. The addition of TAC can promote the precipitation of aluminum at lower pH through its coordination with iron and aluminum, while reducing the loss of REs during precipitation and decreasing the effect of iron on the removal efficiency aluminum.

用碳酸氢铵（ABC）调pH沉淀法分离铝和稀土（REs）时，由于铝和稀土的共沉淀，导致分离效果不理想，影响了稀土碳酸盐的结晶和纯度。因此，由于在沉淀过程中REs的损失，获得高纯度的REs的高回收率是极具挑战性的。本文提出了在柠檬酸三铵（TAC）存在下用ABC沉淀法分离铝、镧、铈的方法。结果表明：铁和铝的去除率和共沉淀REs的损失量（%）取决于TAC和ABC的投加量和溶液ph，铝的去除率与沉淀REs的损失量之间存在互补关系。TAC的最佳用量与铝的浓度或铝铁的摩尔比成线性关系。结果表明，当铁铝比为0.05时，沉淀过程中铁、铝的去除率分别为100%、93%和5.6%，TAC的最佳投加量为铝含量的4 ~ 5%。除铝除铁后，焙烧后的RE2O3产品纯度为99.6%，铝含量为0.31%。与未提纯或未添加TAC的提纯产品相比，RE2O3产品的纯度分别提高了9.31%和1.39%，铝含量分别降低了1.99%和0.78%。TAC的加入通过与铁和铝的配合作用促进了低pH下铝的沉淀，同时减少了沉淀过程中REs的损失，降低了铁对铝去除效率的影响。

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引用次数: 0

The cyanidation of gold. 1. Mixed potential and dissolution studies 氰化金1. 混合电位和溶出度研究

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy

Pub Date : 2025-09-27 DOI: 10.1016/j.hydromet.2025.106579

M. Nicol

Despite the fact that the cyanidation process for the recovery of gold was patented almost 140 years ago, understanding of the dissolution of gold has proved to be particularly elusive. While it is widely accepted to be a typical electrochemically-based corrosion process, details of the published kinetics of the anodic and cathodic reactions have been found to be very variable with little agreement between many studies, predominantly of the anodic reaction.

In this series of three papers, an attempt has been made to shed some light on the electrochemistry of gold in cyanide solutions. Unlike many previous studies, the use of gold‑silver alloys and an electrode fabricated using gold from an actual plant have been used in addition to pure gold. Solutions from two gold plants have also been compared to pure solutions.

The first of these papers summarizes and compares the literature on the anodic characteristics of gold dissolution in cyanide solutions. The use of the mixed-potential model to describe the kinetics of gold dissolution and the important measurement of mixed potentials under typical cyanidation conditions are described in detail with an emphasis on the possible passivation of gold and the effect of the metal and solution composition on the passivation process.

A number of small scale dissolution experiments using various gold materials and solutions has been undertaken in conjunction with mixed potential and anodic voltammetric measurements. This study has shown that electrochemical studies using pure gold electrodes in pure solutions cannot be used to predict the reactivity of gold under actual plant conditions.

尽管回收黄金的氰化工艺在140年前就获得了专利，但事实证明，对黄金溶解的理解尤其难以捉摸。虽然人们普遍认为这是一种典型的电化学腐蚀过程，但已发表的阳极和阴极反应动力学的细节却变化很大，许多研究之间几乎没有一致性，主要是阳极反应。在这一系列的三篇论文中，试图阐明金在氰化物溶液中的电化学。与以前的许多研究不同，除了使用纯金之外，还使用了金-银合金和用来自实际植物的金制成的电极。两种金植物的溶液也与纯溶液进行了比较。本文首先对有关金在氰化物溶液中溶解的阳极特性的文献进行了总结和比较。详细介绍了在典型氰化条件下使用混合电位模型描述金溶解动力学和混合电位的重要测量，重点介绍了金可能的钝化以及金属和溶液组成对钝化过程的影响。在混合电位和阳极伏安测量的基础上，利用各种金材料和溶液进行了一系列小规模的溶解实验。这项研究表明，在纯溶液中使用纯金电极的电化学研究不能用于预测实际工厂条件下金的反应性。

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引用次数: 0

High-pressure acid leaching of laterite ores: Effect of acid and solid content on Ni and Co yield under non-isothermal and isothermal conditions 红土矿石高压酸浸：非等温和等温条件下酸和固含量对镍钴产量的影响

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy

Pub Date : 2025-09-18 DOI: 10.1016/j.hydromet.2025.106576

Okechukwu Vincent Dickson , Thomas Deleau , Fabienne Espitalier , Christophe Coquelet , Julien Lombart , Philippe Accart

The increasing demand for nickel (Ni) in electric vehicle batteries necessitates efficient extraction methods from laterite ores. High-Pressure Acid Leaching (HPAL) is a prominent hydrometallurgical technique known for its rapid kinetics and high (>90 %) metal dissolution. This study examines the influence of acid-to-ore (A/O) ratios (0.25, 0.35, and 0.45) and slurry solid contents (22, 26, and 30 wt.%) on Ni yield and selectivity under both non-isothermal (100 °C, 1.2 bar; 150 °C, 4.7 bar; 200 °C, 18.9 bar; 265 °C, 50.5 bar) and isothermal (265 °C) conditions.

Under non-isothermal conditions, Ni leaching efficiency improved with temperature, achieving a maximum yield of 94.67 ± 0.02 wt.% at 265 °C, compared to 50.86 ± 0.02 wt.% at 200 °C, using an A/O ratio of 0.45 and 26 wt.% solids over 60 min. Isothermal experiments at 265 °C revealed that higher A/O ratios enhanced Ni yield, reaching 94.45 ± 0.01 wt.% at 60 min with 26 wt.% solids and an A/O of 0.45. However, this increased yield was accompanied by higher dissolution of Fe (1.07 ± 0.12 wt.%) and Al (38.84 ± 0.07 wt.%), reducing selectivity to 0.73 ± 0.01. Conversely, an A/O ratio of 0.25 at 26 wt.% solids achieved a higher selectivity of 3.83 ± 0.05 but with a lower Ni yield of 79.14 ± 0.03 wt.%. Lower slurry solid content further improved Ni leaching; at 22 wt.% solids and an A/O of 0.45, Ni yield reached 95.87 ± 0.01 wt.% with a selectivity of 0.89 ± 0.02 at 60 min.

Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD) analyses of leached residues indicated that high temperatures facilitate the transformation of primary minerals like goethite and gibbsite into hematite and hydronium alunite. This transformation is more pronounced at higher A/O ratios, affecting the mineralogical composition of the post-leach solid residue.

随着电动汽车电池对镍的需求不断增加，从红土矿石中提取镍的方法势在必行。高压酸浸（HPAL）是一种杰出的湿法冶金技术，以其快速动力学和高（> 90%）金属溶解而闻名。本研究考察了在非等温（100°C, 1.2 bar; 150°C, 4.7 bar; 200°C, 18.9 bar; 265°C, 50.5 bar）和等温（265°C）条件下酸矿（A/O）比（0.25、0.35和0.45）和矿浆固体含量（22、26和30 wt.%）对镍收率和选择性的影响。在非等温条件下，镍的浸出效率随着温度的升高而提高，在265℃时的最大产率为94.67±0.02 wt.%，而在200℃时，在a /O比为0.45和26 wt.%的固体条件下，60 min的浸出率为50.86±0.02 wt.%。265℃等温实验表明，较高的A/O比提高了Ni的产率，在26 wt.%的固体和0.45的A/O比下，60 min的产率达到94.45±0.01 wt.%。然而，产率的提高伴随着铁（1.07±0.12 wt.%）和铝（38.84±0.07 wt.%）的溶解，选择性降低到0.73±0.01。相反，当A/O比为0.25、固体含量为26 wt.%时，选择性为3.83±0.05，但Ni得率较低，为79.14±0.03 wt.%。较低的料浆固含量进一步改善了镍的浸出；在固体含量为22 wt.%、A/O为0.45的条件下，60 min镍得率为95.87±0.01 wt.%，选择性为0.89±0.02。对浸出渣的扫描电镜（SEM）和x射线衍射（XRD）分析表明，高温有利于针铁矿和三水铝石等原生矿物向赤铁矿和水合明矾石的转变。这种转变在较高的A/O比下更为明显，影响了浸出后固体残渣的矿物学组成。

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引用次数: 0

Palladium adsorption from alkaline glycine-cyanide solutions using activated carbon 活性炭吸附碱性甘氨酸-氰化物溶液中的钯

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy

Pub Date : 2025-09-13 DOI: 10.1016/j.hydromet.2025.106575

C. Rubina Acuña, E.A. Oraby, G.A. Bezuidenhout, C.C. Beh, J.J. Eksteen

There is an increasing demand for the use of Platinum Group Metals (PGMs) in various industries such as fuel cells, auto catalysts, electrical and electronics, e-waste and medical, which has significantly increased their market value (250 % increased value for palladium). Currently, technologies for separating and purifying metals, such as solvent extraction (SX) and ion exchange (IX), are generally applied with cyanide and acidic chloride systems to recover PGMs. In recent years, applications of amino acids, particularly glycine, have been developed and patented, as an alternative lixiviant for gold and copper leaching. Recent research on e-waste has shown an effective dissolution/leaching of Pd from glycine and glycine-cyanide solutions. The alkaline amino acid leaching represents an opportunity for a more selective and environmentally friendly approach, compared to the current applications using cyanide and chlorine systems.

The objective of this research is to investigate the feasibility of palladium (Pd) adsorption, using activated carbon, from synthetic leach solutions containing alkaline glycine–cyanide. 24-h tests were performed to assess the impact over Pd adsorption from various operational parameters including Pd initial concentration, pH, glycine and cyanide concentrations, carbon dosage, and temperature. Results showed that Pd can be efficiently recovered from glycine–cyanide solutions using activated carbon under different operational conditions, with the highest recoveries achieved at 20 g/L carbon dosage and pH 9.5 (98.2 %), and 95.5 % at 5000 mg/L glycine. The results have shown that the most significant parameters impacting adsorption efficiency (kinetics) are carbon dosage, temperature and pH. The experimental data from various initial concentrations of Pd were best fitted to the Langmuir model (R² > 0.9), with the maximum uptake capacity (Q_m) at different initial Pd concentrations ranging between 0.5 mg/g and 2.2 mg/g. In addition, the results of the kinetic modelling were best described by a pseudo-second-order model (R² > 0.99), for all parameters studied.

在燃料电池、汽车催化剂、电气和电子、电子废物和医疗等各个行业，对铂族金属（PGMs）的使用需求不断增加，这大大增加了它们的市场价值（钯的价值增加了250%）。目前，分离和纯化金属的技术，如溶剂萃取（SX）和离子交换（IX），一般采用氰化物和酸性氯化物体系来回收pgm。近年来，氨基酸，特别是甘氨酸，作为金和铜浸出的替代浸出剂已被开发并获得专利。最近对电子垃圾的研究表明，从甘氨酸和甘氨酸氰化物溶液中有效地溶解/浸出Pd。与目前使用氰化物和氯系统的应用相比，碱性氨基酸浸出代表了一种更具选择性和更环保的方法。本研究的目的是探讨活性炭吸附含碱性甘氨酸-氰化物的合成浸出液中钯的可行性。进行了24小时的试验，以评估各种操作参数对Pd吸附的影响，包括Pd初始浓度、pH、甘氨酸和氰化物浓度、碳用量和温度。结果表明，在不同的操作条件下，活性炭均能有效地从甘氨酸-氰化物溶液中回收Pd，其中在碳投加量为20 g/L、pH为9.5时回收率最高（98.2%），在甘氨酸投加量为5000 mg/L时回收率最高（95.5%）。结果表明，影响吸附效率（动力学）最显著的参数是碳用量、温度和ph。不同初始Pd浓度下的实验数据最符合Langmuir模型（R2 > 0.9），不同初始Pd浓度下的最大吸附量（Qm）在0.5 ~ 2.2 mg/g之间。此外，对于所研究的所有参数，动力学建模的结果最好地描述为伪二阶模型（R2 > 0.99）。

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引用次数: 0

Selective adsorption of yttrium(III) and ytterbium(III) from rare earth leachate using a phytic acid (C₆H₁₈O₂₄P₆)-modified adsorbent 用植酸（C₆H₁₈O₂₄P₆）改性吸附剂选择性吸附稀土渗滤液中的钇（III）和钇（III）

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy

Pub Date : 2025-09-11 DOI: 10.1016/j.hydromet.2025.106574

Yaru Duan , Xingyu Tong , Yixiang Wang , Yun Fang , Jun Wang , Yang Liu , Zhenyue Zhang , Ruan Chi , Chunqiao Xiao

The adsorption of rare earth ions (RE³⁺) using modified adsorbents has been proven to be an effective and sustainable extraction method. This study screened phytic acid (C₆H₁₈O₂₄P₆) modified Serratia marcescens (SR-PA) for its ability to efficiently adsorb RE³⁺ from rare earth leachate by determining the best adsorption conditions. Quantum theoretical modeling elucidated the binding mode of phytic acid with RE³⁺. The results showed a maximum adsorption capacity of SR-PA was 103 mg/g. The SR-PA data fitted the Langmuir model and the pseudo-first-order kinetic model. The adsorptive capacity of yttrium(III) and ytterbium(III) by SR-PA were 92.9 % and 89.0 %, respectively, and SR-PA significantly increased the distribution coefficient values of yttrium(III) and ytterbium(III). The separation factor calculations revealed that ytterbium(III) was the easiest RE³⁺ to separate, followed by yttrium(III), dysprosium(III), and gadolinium(III). The electrostatic attraction of SR-PA with RE³⁺ was evaluated using zeta potential measurements, and the dual mesopore–macropore structure of SR-PA was confirmed via characterization analyses. The analyses revealed that the phosphate group in SR-PA adsorbs RE³⁺ through complexation, where PA preferentially forms a colloidal structure with RE³⁺. After five cycles, a slight decline in absorption was observed, confirming the reusability of SR-PA. In addition, the biosafety of SR-PA was confirmed through dissolution tests. The structure of SR-PA is stable, and its application prospects are promising.

改性吸附剂对稀土离子（RE3+）的吸附是一种有效且可持续的萃取方法。通过确定最佳吸附条件，筛选植酸（C₆H₁₈O₂₄P₆）改性粘质沙雷氏菌（SR-PA）对稀土渗滤液中RE3+的高效吸附能力。量子理论模型阐明了植酸与RE3+的结合模式。结果表明，SR-PA的最大吸附量为103 mg/g。SR-PA数据符合Langmuir模型和拟一级动力学模型。SR-PA对钇（III）和镱（III）的吸附量分别为92.9%和89.0%，SR-PA显著提高了钇（III）和镱（III）的分配系数值。分离因子计算表明，钇（III）是最容易分离的RE3+，其次是钇（III）、镝（III）和钆（III）。通过zeta电位测量评价了SR-PA与RE3+的静电吸引力，并通过表征分析证实了SR-PA的双介孔-大孔结构。分析表明，SR-PA中的磷酸基团通过络合作用吸附RE3+， PA优先与RE3+形成胶体结构。5个循环后，观察到吸收率略有下降，证实了SR-PA的可重复使用性。此外，通过溶出度试验证实了SR-PA的生物安全性。SR-PA结构稳定，应用前景广阔。

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引用次数: 0

Aluminium recovery from coal fly ash for the production of high purity alumina 从粉煤灰中回收铝生产高纯氧化铝

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy

Pub Date : 2025-09-06 DOI: 10.1016/j.hydromet.2025.106573

Cameron J. Johnston , Rachel A. Pepper , Wayde N. Martens , Sara J. Couperthwaite

The vast scale of coal combustion worldwide has led to large amounts of fly ash (waste product) being produced. One method of dealing with this waste is using it as a feedstock for new processes, such as producing high purity alumina (HPA: >99.99 % Al₂O₃). The research presented demonstrates a method of recovering aluminium from coal fly ash for the synthesis of high purity alumina. The method involves: (1) a caustic fusion method that converts mullite into soluble sodalite phase, (2) a pH adjustment to concentrate aluminium, (3) a purification stage using hydrochloric acid crystallisation, and (4) calcination at 1250 °C to convert aluminium chloride hexahydrate crystals to α-Al₂O₃. This method produced HPA with an alumina purity of 99.99 %.

世界范围内大规模的煤炭燃烧产生了大量的粉煤灰（废料）。处理这种废物的一种方法是将其用作新工艺的原料，例如生产高纯度氧化铝（HPA: 99.99% Al2O3）。介绍了一种从粉煤灰中回收铝制备高纯氧化铝的方法。该方法包括：(1)苛性碱熔合法，将莫来石转化为可溶的钠石相；(2)调整pH值以浓缩铝；(3)使用盐酸结晶的净化阶段；(4)在1250°C下煅烧，将六水氯化铝晶体转化为α-Al2O3。该方法制得氧化铝纯度为99.99%的HPA。

引用次数: 0

Separation of nickel, copper and zinc sulfate solutions from electroplating sludge leachate using a novel synergistic solvent system of DMPY and Versatic 10 DMPY和Versatic 10协同溶剂体系分离电镀污泥渗滤液中镍、铜和硫酸锌溶液的研究

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy

Pub Date : 2025-09-05 DOI: 10.1016/j.hydromet.2025.106567

Haokai Peng , Zuoying Cao , Shengxi Wu , Qinggang Li , Mingyu Wang , Xinsheng Wu , Wenjuan Guan , Guiqing Zhang

As the demand for Ni continues to rise, the recovery of Ni from electroplating sludge leachate has become an effective approach to alleviate supply constraints. However, the presence of impurities such as Cu, Zn, and Ca in the leachate complicates the Ni recovery process. To address these challenges, a novel pyridine group extractant, 2-((dodecylthio) methyl) pyridine (DMPY), was designed, synthesized, and evaluated for its synergistic performance with Versatic 10 (C₁₀H₂₀O₂) in selectively extracting Ni. Under optimal conditions, Ni was selectively recovered from electroplating sludge leachate including Cu, Zn, and Ca through three steps of the extraction processes. Mechanistic studies revealed that both DMPY and Versatic 10 anion coordinated with Ni²⁺, providing charge balance, forming the complex [Ni²⁺(DMPY)₂(C₁₀H₁₉O₂⁻)₂]. This synergistic solvent system significantly improved Ni extraction efficiency while minimizing reagent consumption. In conclusion, The DMPY-Versatic 10 system offers a sustainable and environmentally friendly solution, enhancing the hydrometallurgical treatment of polymetallic electroplating sludge and contributing to resource recovery and environmental protection.

随着对镍的需求不断上升，从电镀污泥渗滤液中回收镍已成为缓解供应紧张的有效途径。然而，渗滤液中Cu、Zn和Ca等杂质的存在使Ni的回收过程变得复杂。为了解决这些问题，设计、合成了一种新型吡啶基萃取剂2-（（十二烷基硫代）甲基）吡啶（DMPY），并对其与Versatic 10 （C10H20O2）选择性萃取Ni的协同性能进行了评价。在最优条件下，从电镀污泥渗滤液中选择性回收Cu、Zn、Ca三种元素中的Ni。机理研究表明，DMPY和Versatic 10阴离子均与Ni2+配位，提供电荷平衡，形成配合物[Ni2+(DMPY)2(C₁₀H19O₂−)2]。这种协同溶剂体系显著提高了镍的萃取效率，同时最大限度地减少了试剂的消耗。综上所述，DMPY-Versatic 10系统提供了一个可持续和环保的解决方案，加强了多金属电镀污泥的湿法冶金处理，有助于资源回收和环境保护。

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