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Precipitation of the ultrafine equiaxial near-spherical gibbsite with low oil absorption value by adding mixed seeds 加入混合种子可析出低吸油值的超细等轴近球形三水铝石
IF 4.8 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2025-10-08 DOI: 10.1016/j.hydromet.2025.106586
Jinquan Wen, Guihua Liu, Tiangui Qi, Qiusheng Zhou, Zhihong Peng, Xiaobin Li, Yilin Wang, Leiting Shen
Ultrafine, near-spherical gibbsite with a low oil-absorption value hold significant potential for use in advanced flame-retardant fillers, polishing materials and dense alumina-bearing ceramics owing to its regular morphology, high dispersibility and good flowability. In this study, ultrafine equiaxial near-spherical gibbsite with a medium particle size (d50) of 359 nm and an oil-absorption values of 25.0 mL/100 g was precipitated by seeded precipitation from sodium aluminate solution. The mixed seeds, comprising bayerite and gibbsite, were prepared by the addition of NaHCO3, Al2(SO4)3, and H2O2, respectively. A high bayerite content in the NaHCO3-induced seeds, combined with significant supersaturation fluctuations, enabled a precipitation efficiency exceeding 51 % at an initial temperature of 80 °C for 35 h. Preferential growth of the (110), (100), and (001) planes occurred during the early stage, followed by the emergence of the (101) and (112) planes in the mid-to-late stage. High supersaturation from bayerite dissolution and adsorption of Al(OH)4 ions promoted the development of (001), (110), (100), (101), and (112) planes, resulting in the formation of equiaxial near-spherical gibbsite. Furthermore, the low surface energy and high zeta potential of the well-crystallized gibbsite precipitated from NaHCO3-induced seeds contributed to its low oil absorption. These findings indicate that the presence of bayerite in seeds, elevated interfacial supersaturation, and high temperature collectively facilitate the formation of ultrafine, equiaxial, near-spherical gibbsite.
超细近球形三水铝石具有较低的吸油值,其形态规则、分散性高、流动性好,在高级阻燃填料、抛光材料和致密氧化铝陶瓷等方面具有重要的应用潜力。本研究采用种子沉淀法从铝酸钠溶液中析出中粒径(d50)为359 nm、吸油值为25.0 mL/100 g的超细等轴近球形三水铝石。用NaHCO3、Al2(SO4)3和H2O2分别制备了bayerite和三水铝石混合种子。nahco3诱导种子中bayerite含量高,且有明显的过饱和波动,使得在80℃的初始温度下,35 h的降水效率超过51%。(110)、(100)和(001)平面在早期优先生长,随后(101)和(112)平面在中后期出现。bayerite的溶解和Al(OH)4−离子的高过饱和吸附促进了(001)、(110)、(100)、(101)和(112)平面的发育,形成等轴近球形三水铝石。此外,从nahco3诱导种子中析出的结晶良好的三水铝石具有较低的表面能和较高的zeta电位,这也是其吸油率较低的原因之一。这些结果表明,种子中贝汞石的存在、界面过饱和的升高和高温共同促进了超细、等轴、近球形三沸石的形成。
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引用次数: 0
The cyanidation of gold. III. Mechanistic details of the role of lead and sulfide ions 氰化金3。铅和硫化物离子作用的机理细节
IF 4.8 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2025-10-08 DOI: 10.1016/j.hydromet.2025.106584
M. Nicol
The role of lead ions in the cyanidation of gold has been extensively studied in this investigation. In addition to a speciation analysis using accepted thermodynamic data, the equilibrium potential for the deposition of lead under cyanidation conditions has been estimated. This has been used in conjunction with other electrochemical measurements to confirm that bulk lead metal is not deposited on a gold surface during cyanidation. The underpotential deposition of lead has been confirmed and it has been shown that an incomplete layer of lead is responsible for the increased rates in the presence of lead. The detrimental effect of high lead concentrations appears to be the result of the formation of a complete lead layer on the gold surface.
A less extensive study of the effect of sulfide ions on the rate of cyanidation has confirmed that low (micro-molar) concentrations of sulfide ions enhance the dissolution of gold in cyanide solutions but inhibit the rate of dissolution at high concentrations. The detrimental effect is associated with the anodic oxidation of gold and the formation of a passivating layer of Au2S is possibly responsible. There does not appear to be a significant effect of sulfide on the kinetics of the cathodic reduction of oxygen. A gold alloy containing 10 % silver is less susceptible to the inhibitory effect of sulfide ions.
本文对铅离子在金氰化反应中的作用进行了广泛的研究。除了利用公认的热力学数据进行形态分析外,还估计了氰化条件下铅沉积的平衡势。这已经与其他电化学测量一起使用,以确认在氰化过程中大块金属铅不会沉积在金表面。铅的欠电位沉积已经得到证实,并且已经表明,在铅存在的情况下,不完整的铅层是导致速率增加的原因。高铅浓度的有害影响似乎是在金表面形成完整铅层的结果。一项对硫化物离子对氰化速率影响的不太广泛的研究证实,低(微摩尔)浓度的硫化物离子促进了金在氰化物溶液中的溶解,但抑制了高浓度的溶解速率。这种不利影响与金的阳极氧化有关,而Au2S钝化层的形成可能是罪魁祸首。硫化物对氧的阴极还原动力学似乎没有显著的影响。含银10%的金合金对硫化物离子的抑制作用不太敏感。
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引用次数: 0
Field-effect separation of rare earth elements in gelatin-supported media 稀土元素在明胶介质中的场效应分离
IF 4.8 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2025-10-04 DOI: 10.1016/j.hydromet.2025.106585
Benjamin Schroeder , Michael Free , Prashant K. Sarswat
The unique optical, electronic, and magnetic properties of the Rare Earth Elements (La-Lu + Sc, Y) have led to a significant increase in their demand by a wide variety of industries. This, coupled with the significant difficulty associated with their extraction, separation, and purification, has resulted in a strong interest in replacing the traditional solvent extraction with a new approach. In response, a new technology called “Field-Effect Separation” (FES) has been developed, which utilizes differences in the magnetic susceptibilities of ions in a strong field to separate them from one another. While it has been demonstrated that this approach can work, it is necessary to more fully understand and optimize the separation of elements. The approach taken to study this was to suspend a solution of REE ions in a firm gelatin, separating them using a strong magnet, freezing the sample to preserve separation, and taking fine slices to analyze the concentration of ions at different spatial positions relative to the magnet as well as different times relative to the beginning of the magnetic field exposure. The results show a significant concentration effect for the magnetically susceptible REEs near the magnet's surface, while the non-susceptible ions seem relatively unconcentrated by the magnetic field. Additionally, among the susceptible REEs, at certain, short separation timescales, a significant stratification of REEs was observed. This suggests that the REEs can be separated from one another using FES assuming a correct time and length scale can be selected for the system.
稀土元素(La-Lu + Sc, Y)独特的光学、电子和磁性能导致了各种行业对其需求的显著增加。这一点,再加上萃取、分离和纯化的巨大困难,使得人们对用一种新的方法取代传统的溶剂萃取产生了浓厚的兴趣。为此,一种名为“场效应分离”(FES)的新技术被开发出来,该技术利用离子在强磁场中的磁化率差异将它们彼此分离。虽然已经证明这种方法是可行的,但有必要更充分地了解和优化元素的分离。研究方法是将稀土离子溶液悬浮在坚硬的明胶中,用强磁铁将其分离,冷冻样品以保持分离,并取细片来分析相对于磁铁的不同空间位置以及相对于磁场暴露开始的不同时间的离子浓度。结果表明,磁体表面附近磁敏感的稀土离子具有显著的富集效应,而非磁敏感的稀土离子在磁场作用下相对不集中。此外,在某些易受影响的稀土元素中,在一定的短分离时间尺度上,观察到明显的稀土分层现象。这表明,假设系统可以选择正确的时间和长度尺度,则可以使用FES将ree相互分离。
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引用次数: 0
Understanding limitations to monazite concentrate dissolution in oxalic acid 了解单氮石精矿在草酸中溶解的局限性
IF 4.8 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2025-10-03 DOI: 10.1016/j.hydromet.2025.106582
Mark Stephen Henderson, Laurence Gerald Dyer, Bogale Tadesse
Prior works with organic acids have shown dissolution of rare earth element (REE) bearing phosphate minerals with oxalic acid, solubilising phosphate and depositing rare earth oxalates that can be solubilised in a second stage. Previously published information shows local maxima in recovery and hypothesised reaction control mechanisms. The current article investigates reaction limitations (mineralogical and thermodynamic) in greater depth to inform process development.
Monazite concentrate was treated with oxalic acid at temperatures in a range from 30 °C to 95 °C. Various factors were found to influence the extent of phosphorus dissolution. Previous studies achieved <32 % phosphate dissolution at 65 °C, this work has demonstrated the ability to achieve in excess of 65 % conversion using a multi-stage, cross flow leach at 45 °C with a large reduction in simultaneous iron dissolution.
Approximately 65 % of the phosphorus was solubilised using a multi-stage, cross-flow leach system. Two different monazite compositional signatures, indicative of variations in REE and phosphorus contents, were identified displaying significantly different reactivity. One form readily dissolved in oxalic acid, the other experienced little or no reaction.
Calculated oxalate losses to the reprecipitated salts and complexation with solution components was used to estimate availability of free oxalate, this was supported by the concentration of elements with low oxalate solubility (Ca and Ce). It was demonstrated that free oxalate is a limiting factor in dissolution. It is therefore evident that under different conditions, there are both mineralogical and solution thermodynamic drivers for reaction rate and extent achievable.
先前对有机酸的研究表明,含稀土元素(REE)的磷酸盐矿物与草酸溶解,溶解磷酸盐,并沉积可在第二阶段溶解的稀土草酸盐。先前发表的信息显示了恢复的局部最大值和假设的反应控制机制。本文更深入地研究了反应的局限性(矿物学和热力学),以便为工艺开发提供信息。用草酸在30 ~ 95℃的温度范围内处理独居石精矿。各种因素影响了磷的溶解程度。先前的研究在65°C下实现了32%的磷酸盐溶解,这项工作证明了在45°C下使用多级交叉流浸出可以实现超过65%的转化率,同时铁的溶解也大大减少。大约65%的磷是通过多级交叉流浸出系统溶解的。两种不同的独居石组成特征显示出明显不同的反应活性,表明稀土和磷含量的变化。一种形式很容易溶解在草酸中,另一种很少或没有反应。计算草酸盐在再沉淀盐中的损失和与溶液组分的络合作用被用来估计游离草酸盐的可用性,这得到了草酸盐溶解度低的元素(Ca和Ce)浓度的支持。结果表明,游离草酸盐是溶出的限制因素。由此可见,在不同条件下,矿物学和溶液热力学都是影响反应速率和可达到程度的驱动因素。
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引用次数: 0
Cationic polyacrylamide (CPAM) assisted leaching of rare earth ore containing clay minerals by inhibiting swelling and promoting permeation of ammonium sulfate solution 阳离子聚丙烯酰胺(CPAM)通过抑制溶胀和促进硫酸铵溶液的渗透来辅助含粘土矿物稀土矿的浸出
IF 4.8 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2025-10-03 DOI: 10.1016/j.hydromet.2025.106583
Meiling Jiang , Huifang Yang , Wenqian Cui , Yunbo Yang , Zhenyue Zhang , Zhengyan He , Zhigao Xu , Ming Wu , Jun Zhao , Ruan Chi
In-situ leaching of clay-based weathered crust elution-deposited rare earth ore (WCE-DREO) is prone to landslides resulting from the swelling of clay minerals, which compromises both ecological safety, economics and efficiency of mining. This study used the cationic polyacrylamide (CPAM), mixed with 2.0 wt% (NH4)2SO4 to form a composite leaching agent to address this issue, which serves two purposes: (i) it acts as an inhibitor of clay swelling, (ii) it promotes the permeation of the leaching agent. Linear swelling tests and column leaching experiments were conducted to evaluate the effect of CPAM on swelling inhibition and permeation promotion in rare earth ore leaching. The underlying mechanisms were tested and analyzed through a series of advanced characterization methods. The findings demonstrate that the addition of CPAM significantly enhances the permeation of the leaching agent. Furthermore, the composite leaching agent of (NH4)2SO4 and CPAM inhibits the swelling at higher CPAM concentrations. At a CPAM concentration of 3 × 10−4 wt%, the seepage time of the leaching agent is minimized—effectively reduced by 46 %, compared to using 2.0 wt% (NH4)2SO4 alone. The CPAM structure contains amine groups and positively charged quaternary ammonium groups which enable the adsorption of CPAM onto the clay mineral interlayer and surface through hydrogen bonding and electrostatic interactions. This adsorption affects in four ways: (i) hinders the entry of water molecules into the mineral interlayers, (ii) reduces electrostatic repulsion, (iii) compresses the diffuse double layer, and (iv) promotes the aggregation of fine particles into larger clusters. These effects further inhibit the swelling of clay minerals and promote the permeation of the leaching agent. At the same time, the long-chain structure of CPAM helps to entangle fine clay mineral particles into larger clusters. This prevents clogging of the permeation channel due to the movement of fine particles along with the (NH4)2SO4 solution, thereby increasing the seepage rate. Additionally, CPAM can enter the clay mineral layers to discharge internal water and further inhibit swelling. This study provides theoretical insights and technical support for the safe and highly efficient mining of WCE-DREO.
粘土风化壳淋溶稀土矿(WCE-DREO)的原位浸出易因粘土矿物膨胀而发生滑坡,严重影响开采的生态安全、经济效益和开采效率。本研究使用阳离子聚丙烯酰胺(CPAM)与2.0 wt% (NH4)2SO4混合形成复合浸出剂来解决这一问题,这有两个目的:(i)它可以作为粘土膨胀的抑制剂,(ii)它可以促进浸出剂的渗透。通过线性溶胀试验和柱式浸出试验,评价了CPAM在稀土矿浸出过程中抑制溶胀和促进渗透的效果。通过一系列先进的表征方法对其潜在机制进行了测试和分析。结果表明,CPAM的加入显著提高了浸出剂的渗透性。此外,(NH4)2SO4和CPAM复合浸出剂抑制了较高CPAM浓度下的溶胀。当CPAM浓度为3 × 10−4 wt%时,浸出剂的渗透时间最小,与单独使用2.0 wt% (NH4)2SO4相比,有效减少了46%。CPAM结构中含有胺基和带正电的季铵基,使CPAM能够通过氢键和静电相互作用吸附在粘土矿物层间和表面。这种吸附作用有四个方面:(i)阻碍水分子进入矿物中间层,(ii)减少静电斥力,(iii)压缩扩散双层,(iv)促进细颗粒聚集成更大的簇。这些作用进一步抑制粘土矿物的溶胀,促进浸出剂的渗透。同时,CPAM的长链结构有助于将细小的粘土矿物颗粒缠绕成更大的团簇。这样可以防止细颗粒随着(NH4)2SO4溶液的移动而堵塞渗透通道,从而增加渗透速率。此外,CPAM可以进入粘土矿物层排出内部水分,进一步抑制膨胀。本研究为WCE-DREO安全高效开采提供了理论见解和技术支撑。
{"title":"Cationic polyacrylamide (CPAM) assisted leaching of rare earth ore containing clay minerals by inhibiting swelling and promoting permeation of ammonium sulfate solution","authors":"Meiling Jiang ,&nbsp;Huifang Yang ,&nbsp;Wenqian Cui ,&nbsp;Yunbo Yang ,&nbsp;Zhenyue Zhang ,&nbsp;Zhengyan He ,&nbsp;Zhigao Xu ,&nbsp;Ming Wu ,&nbsp;Jun Zhao ,&nbsp;Ruan Chi","doi":"10.1016/j.hydromet.2025.106583","DOIUrl":"10.1016/j.hydromet.2025.106583","url":null,"abstract":"<div><div>In-situ leaching of clay-based weathered crust elution-deposited rare earth ore (WCE-DREO) is prone to landslides resulting from the swelling of clay minerals, which compromises both ecological safety, economics and efficiency of mining. This study used the cationic polyacrylamide (CPAM), mixed with 2.0 wt% (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub> to form a composite leaching agent to address this issue, which serves two purposes: (i) it acts as an inhibitor of clay swelling, (ii) it promotes the permeation of the leaching agent. Linear swelling tests and column leaching experiments were conducted to evaluate the effect of CPAM on swelling inhibition and permeation promotion in rare earth ore leaching. The underlying mechanisms were tested and analyzed through a series of advanced characterization methods. The findings demonstrate that the addition of CPAM significantly enhances the permeation of the leaching agent. Furthermore, the composite leaching agent of (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub> and CPAM inhibits the swelling at higher CPAM concentrations. At a CPAM concentration of 3 × 10<sup>−4</sup> wt%, the seepage time of the leaching agent is minimized—effectively reduced by 46 %, compared to using 2.0 wt% (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub> alone. The CPAM structure contains amine groups and positively charged quaternary ammonium groups which enable the adsorption of CPAM onto the clay mineral interlayer and surface through hydrogen bonding and electrostatic interactions. This adsorption affects in four ways: (i) hinders the entry of water molecules into the mineral interlayers, (ii) reduces electrostatic repulsion, (iii) compresses the diffuse double layer, and (iv) promotes the aggregation of fine particles into larger clusters. These effects further inhibit the swelling of clay minerals and promote the permeation of the leaching agent. At the same time, the long-chain structure of CPAM helps to entangle fine clay mineral particles into larger clusters. This prevents clogging of the permeation channel due to the movement of fine particles along with the (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub> solution, thereby increasing the seepage rate. Additionally, CPAM can enter the clay mineral layers to discharge internal water and further inhibit swelling. This study provides theoretical insights and technical support for the safe and highly efficient mining of WCE-DREO.</div></div>","PeriodicalId":13193,"journal":{"name":"Hydrometallurgy","volume":"239 ","pages":"Article 106583"},"PeriodicalIF":4.8,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145270437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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 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 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 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 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 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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Hydrometallurgy
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