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Separation of rare earth elements via pickering emulsion: A sustainable approach to physicochemical beneficiation 酸洗乳剂分离稀土元素:一种可持续的物理化学选矿方法
IF 4.9 2区 工程技术
Minerals Engineering Pub Date : 2025-07-21 DOI: 10.1016/j.mineng.2025.109631
Mohammed Zriki , Adrián Carrillo Garcia , Louis Fradette , Jamal Chaouki
{"title":"Separation of rare earth elements via pickering emulsion: A sustainable approach to physicochemical beneficiation","authors":"Mohammed Zriki ,&nbsp;Adrián Carrillo Garcia ,&nbsp;Louis Fradette ,&nbsp;Jamal Chaouki","doi":"10.1016/j.mineng.2025.109631","DOIUrl":"10.1016/j.mineng.2025.109631","url":null,"abstract":"<div><div>Separating rare earth elements (REE) bearing minerals from their associated gangue minerals, such as dolomite and calcite, is challenging, particularly for fine particle size, due to their similar physicochemical surface properties. To exploit the small differences in surface properties between the gangue and the REE minerals, a solid stabilized emulsification (SSE) process was developed to concentrate the fine REE minerals, bastnaesite, and monazite, from carbonate minerals. Our study examines the minerals’ surface properties, contact angle, and zeta potential, on the resulting mineral-oil–water emulsion systems.</div><div>The mineral separation occurred naturally, without surface modifiers, using key operating parameters, like moderate agitation (450 rpm), low oil viscosity (&lt; 20 cSt), and a pH ranging from 6 to 10. In the fine ore (&lt; 38 µm), REE-bearing minerals, predominantly liberated or highly exposed, had a strong affinity for the oil phase (contact angle &gt; 59°), compared to the carbonate minerals (contact angle &lt; 48°), which remained in the aqueous phase. As monazite and bastnaesite, particularly monazite, tended to attach to the oil, a 68 % REE recovery and an enrichment ratio of 2.9 occurred in a single-stage emulsification process. This study showcases SSE as a promising sustainable solution for rare earth beneficiation.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"233 ","pages":"Article 109631"},"PeriodicalIF":4.9,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144672465","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}
引用次数: 0
Aggregation relations and flotation behavior of the depressant pectin on talc, chlorite, and serpentine and its mechanism of action 抑制剂果胶在滑石、绿泥石和蛇纹石上的聚集关系、浮选行为及其作用机理
IF 4.9 2区 工程技术
Minerals Engineering Pub Date : 2025-07-20 DOI: 10.1016/j.mineng.2025.109637
Xusheng Yang , Bo Feng , Ziming Wang , Longxia Jiang , Jefferson Bayoundoula
{"title":"Aggregation relations and flotation behavior of the depressant pectin on talc, chlorite, and serpentine and its mechanism of action","authors":"Xusheng Yang ,&nbsp;Bo Feng ,&nbsp;Ziming Wang ,&nbsp;Longxia Jiang ,&nbsp;Jefferson Bayoundoula","doi":"10.1016/j.mineng.2025.109637","DOIUrl":"10.1016/j.mineng.2025.109637","url":null,"abstract":"<div><div>In this study, pectin was used as an environmentally friendly depressant to study its flotation behavior and aggregation effect on key magnesium silicate gangue minerals commonly found in nickel ore, such as talc, chlorite, and serpentine. The interaction mechanisms between pectin and minerals were explored using a series of techniques, including IC-FBRM particle size analysis, adsorption tests, scanning electron microscopy (SEM) tests, FTIR analysis, XPS analysis, and zeta potential measurements. Results from flotation experiments, IC-FBRM tests, and SEM observations indicate that under natural conditions, serpentine tends to aggregate with talc, but the three mixed minerals still exhibit floatability. At low dosages of pectin, serpentine and chlorite tend to aggregate together. Further increasing the pectin dosage reduces the recovery rate to 0%. FTIR and XPS analyses reveal that the –OH groups in pectin chemically interact with Mg atoms in chlorite. Zeta potential results show that pectin causes a significant downward shift in the zeta potential of chlorite.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"233 ","pages":"Article 109637"},"PeriodicalIF":4.9,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144665525","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}
引用次数: 0
Flotation separation of vanadium-bearing clays, kerogen, and calcite in the Julia Creek oil shales Julia Creek油页岩中含钒粘土、干酪根和方解石的浮选分离
IF 4.9 2区 工程技术
Minerals Engineering Pub Date : 2025-07-19 DOI: 10.1016/j.mineng.2025.109630
Wei Sung Ng, Elizaveta Forbes
{"title":"Flotation separation of vanadium-bearing clays, kerogen, and calcite in the Julia Creek oil shales","authors":"Wei Sung Ng,&nbsp;Elizaveta Forbes","doi":"10.1016/j.mineng.2025.109630","DOIUrl":"10.1016/j.mineng.2025.109630","url":null,"abstract":"<div><div>The Julia Creek oil shales in Queensland, Australia, is one of the largest carboniferous vanadium deposits in the world, with inferred resources of over 2,400 Mt at grades of 0.31% V<sub>2</sub>O<sub>5</sub>. The increasing demand for vanadium as a vital component for energy storage technologies represents a large untapped opportunity to supply the global need for vanadium. The Julia Creek deposit consists of shale regions and carbonate-rich coquina regions, and contains high-value kerogen in addition to vanadium that is primarily hosted in the clays. The key processing challenge is in the separation of the hydrocarbon oils and the vanadium-bearing clays from the calcite gangue, and the aim of this review is to examine the application of froth flotation as a possible approach. This review will first detail the mineralogical aspects of the Julia Creek oil shales, followed by a comprehensive overview of flotation practices for the separation of kerogen, calcite, and clay minerals. The focus of the discussion will be on the reagent chemistries of the collector and depressants used in flotation, as well as the operating conditions for the flotation recovery or rejection of the three components, while also highlighting potential challenges to their implementation for the Julia Creek deposit. Subsequently, the review will assess flotation pathways for the processing of the different shales and coquina regions.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"233 ","pages":"Article 109630"},"PeriodicalIF":4.9,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144662629","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}
引用次数: 0
Synthesis and characterization of a clay-coal waste-based adsorbent for contaminant removal from acid mine drainage 煤矸石基酸性矿山废水污染物去除吸附剂的合成与表征
IF 4.9 2区 工程技术
Minerals Engineering Pub Date : 2025-07-19 DOI: 10.1016/j.mineng.2025.109616
Laura Alessandra Prado Milani , Lívia Fernandes , Eduardo Alberton Ribeiro , Rodrigo Battisti , Vilmar Menegon Bristot , Agenor De Noni Jr , Dachamir Hotza , Marcelo Dal Bó
{"title":"Synthesis and characterization of a clay-coal waste-based adsorbent for contaminant removal from acid mine drainage","authors":"Laura Alessandra Prado Milani ,&nbsp;Lívia Fernandes ,&nbsp;Eduardo Alberton Ribeiro ,&nbsp;Rodrigo Battisti ,&nbsp;Vilmar Menegon Bristot ,&nbsp;Agenor De Noni Jr ,&nbsp;Dachamir Hotza ,&nbsp;Marcelo Dal Bó","doi":"10.1016/j.mineng.2025.109616","DOIUrl":"10.1016/j.mineng.2025.109616","url":null,"abstract":"<div><div>This study aims to develop an adsorbent material from solid coal waste and expanded clay to remove contaminants from acid mine drainage (AMD). A solid residue from coal extraction in the southern region of Santa Catarina, Brazil, and a clay from the same region were selected for the adsorbent synthesis. The synthesis process followed a full 3<sup>2</sup> factorial experimental design, varying composition (pure coal waste, mixture and, pure clay), particle size (fine (88 μm ≤ D ≤ 250 μm), medium (250 μm ≤ D &lt; 840 μm), and coarse (840 ωm ≤ D &lt; 2.380 μm), and mass, resulting in 36 tests. The results demonstrated that the developed adsorbents exhibited significant adsorption capacity for iron ions, with nearly 100 % removal of this contaminant using small quantities of adsorbent. For nickel ions, the best results showed approximately a 40 % reduction in the concentration of this heavy metal. Zinc ion concentrations were reduced by about 77 %. In all cases, the adsorbents developed in this study outperformed commercial activated carbon in adsorption capacity. Furthermore, the particle size of the adsorbents had a notable impact on adsorption performance, with smaller particle sizes leading to increased adsorption capacity, which can be attributed to the larger surface area.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"233 ","pages":"Article 109616"},"PeriodicalIF":4.9,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144662510","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}
引用次数: 0
The role of surface mobility in enhancing froth drainage and reducing entrainment in flotation 在浮选过程中,表面迁移率在提高泡沫排水和减少夹带中的作用
IF 4.9 2区 工程技术
Minerals Engineering Pub Date : 2025-07-19 DOI: 10.1016/j.mineng.2025.109632
Thao T.P. Nguyen, Thien H. Tran, Tuan A.H. Nguyen, Ngoc N. Nguyen, Anh V. Nguyen
{"title":"The role of surface mobility in enhancing froth drainage and reducing entrainment in flotation","authors":"Thao T.P. Nguyen,&nbsp;Thien H. Tran,&nbsp;Tuan A.H. Nguyen,&nbsp;Ngoc N. Nguyen,&nbsp;Anh V. Nguyen","doi":"10.1016/j.mineng.2025.109632","DOIUrl":"10.1016/j.mineng.2025.109632","url":null,"abstract":"<div><div>Improving froth drainage is crucial for reducing gangue entrainment and increasing concentrate quality in flotation. Advancing our previous work on promoting foam (particle-free) drainage via modulating interfacial mobility through hydrogen bonding networks at the air–water interface, this study extends the investigation to particle-laden froths under industrially relevant conditions. Laboratory-scale flotation experiments were performed in a Microcel™ column with industrial samples of varying but controlled particle size distributions and regrinding. Froth imaging was employed to assess froth bubble behaviour. Results reveals that low-dosage glycerol significantly enhances flotation froth drainage, underscoring the role of interfacial hydrogen bonding in modulating interfacial mobility and froth drainage in three-phase systems. The extent of water drainage improvement depends on bubble size, which is influenced by particle characteristics. Fine, well-liberated particles generate small, rigid bubbles that hinder water drainage, whereas coarser particles promote larger, more mobile bubbles that facilitate faster drainage but may reduce concentrate mass yield due to bubble coalescence. These findings provide new insights into tailoring froth structure and surface mobility for improved flotation performance.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"233 ","pages":"Article 109632"},"PeriodicalIF":4.9,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144662631","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}
引用次数: 0
Advances in zinc oxide mineral flotation: Fundamentals, practices and perspectives 氧化锌矿物浮选研究进展:基础、实践与展望
IF 4.9 2区 工程技术
Minerals Engineering Pub Date : 2025-07-19 DOI: 10.1016/j.mineng.2025.109621
Qian Zhang, Shuming Wen, Zhengyong Song, Yanyu Tang, Qicheng Feng
{"title":"Advances in zinc oxide mineral flotation: Fundamentals, practices and perspectives","authors":"Qian Zhang,&nbsp;Shuming Wen,&nbsp;Zhengyong Song,&nbsp;Yanyu Tang,&nbsp;Qicheng Feng","doi":"10.1016/j.mineng.2025.109621","DOIUrl":"10.1016/j.mineng.2025.109621","url":null,"abstract":"<div><div>The development and utilization of zinc oxide ore is one of the important ways to supplement zinc resources. The zinc oxide minerals with economically value mainly include smithsonite and hemimorphite. Flotation is the main method to separate and enrich zinc oxide ore, and a lot of research has been carried out on the direct flotation and sulfide flotation of zinc oxide ore. In this paper, the relationship between surface properties and solution components and floatability of common zinc oxide ores are summarized, and the common flotation methods and theoretical studies of zinc oxide ores are reviewed. Among, the direct flotation method includes the fatty acid flotation and the chelating collector flotation. The sulfidization flotation methods are sulfidization-xanthate flotation, sulfidization-amine flotation, enhanced sulfidization flotation and sulfidization-combined collector flotation. Based on the problems of direct flotation method with poor agent selection and high cost, sulfidization flotation method with low sulfidization efficiency, difficult to control foam, large amount of collector, etc., in future research, in-depth research should be carried out on the theoretical research and practical application of zinc oxide ore enhanced sulfidization flotation, foam control and mud suppression flotation, and research and development of combined collector, so as to provide references for the development and utilization of zinc oxide ore.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"233 ","pages":"Article 109621"},"PeriodicalIF":4.9,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144662628","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}
引用次数: 0
Hydrophilic Fe3O4 nanoparticles coatings with starch and citric acid for efficient flotation separation of quartz from magnetite 淀粉和柠檬酸包裹的亲水纳米Fe3O4用于磁铁矿中石英的高效浮选分离
IF 4.9 2区 工程技术
Minerals Engineering Pub Date : 2025-07-19 DOI: 10.1016/j.mineng.2025.109626
Zhichao Yang, Yijiang Heng, Ni Gao, Qing Teng, Yu Zheng
{"title":"Hydrophilic Fe3O4 nanoparticles coatings with starch and citric acid for efficient flotation separation of quartz from magnetite","authors":"Zhichao Yang,&nbsp;Yijiang Heng,&nbsp;Ni Gao,&nbsp;Qing Teng,&nbsp;Yu Zheng","doi":"10.1016/j.mineng.2025.109626","DOIUrl":"10.1016/j.mineng.2025.109626","url":null,"abstract":"<div><div>The expansion of the steel industry has led to the extensive use of a lot of starch depressants during the flotation separation of fine particles, aiming to isolate iron oxides from quartz gangue. As such, there is a pressing need for efficient depressants that display selectivity to minimize the use of starch. To achieve this, hydrophilic starch and citric acid were coated onto Fe<sub>3</sub>O<sub>4</sub> nanoparticles using a simple and cost-effective dip-coating method. Characterization techniques were employed to confirm the successful synthesis of functionalized magnetic nanoparticles (FNDs). The contact angle results indicated that hydrophilic FNDs exhibit high selectivity in depressing magnetite. The hydrophilic FNDs was applied as depressant to separation of quartz from magnetite at single-mineral and mixed-mineral flotation experimental conditions, and the results indicated that the maximum recovery gap between magnetite and quartz is 91.6% at pH 10.0 and the TFe grade of the concentrate and recovery rate reached 58.18% and 93.03%, respectively. Further, SEM, FTIR and XPS analyses were performed to detect the functional part and adsorption mechanism of FNDs. The results indicated that the FNDs evenly deposited on the magnetite surface through chemical action while the aggregation of nanoparticles distributed in specific areas on the quartz surface could not hinder the adsorption of DDA. Additionally, the elucidated results of particle–particle interactions suggested that the magnetic attraction is pivotal in the selective adsorption between FNDs and the mineral particles. Thus, the modified Fe<sub>3</sub>O<sub>4</sub> nanoparticles is an excellent depressant for practical applications in separation of quartz from magnetite.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"233 ","pages":"Article 109626"},"PeriodicalIF":4.9,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144662509","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}
引用次数: 0
Carbochlorination extraction of rare earth Elements: Thermodynamics, kinetics and mechanism investigation 碳氯化萃取稀土元素:热力学、动力学及机理研究
IF 4.9 2区 工程技术
Minerals Engineering Pub Date : 2025-07-19 DOI: 10.1016/j.mineng.2025.109623
Haiyue Xue, Guozhi Lv, Long Wang, Jiawei Ren, Xinxin Zhao, Ting-an Zhang
{"title":"Carbochlorination extraction of rare earth Elements: Thermodynamics, kinetics and mechanism investigation","authors":"Haiyue Xue,&nbsp;Guozhi Lv,&nbsp;Long Wang,&nbsp;Jiawei Ren,&nbsp;Xinxin Zhao,&nbsp;Ting-an Zhang","doi":"10.1016/j.mineng.2025.109623","DOIUrl":"10.1016/j.mineng.2025.109623","url":null,"abstract":"<div><div>A systematic investigation was carried out on the reaction mechanism and kinetic characteristics of the carbochlorination process for bastnaesite. The thermodynamic properties of the process were discussed via Gibbs free energy calculations and construction of predominance area diagrams for the RE-O-Cl system. A five-factor, four-level orthogonal experimental design was employed to optimize process parameters, with detailed analysis of each parameter’s influence on the experimental process and significance assessment. Experimental results demonstrated that under the conditions of chlorination temperature at 700℃, chlorination time of 60 min, carbon ratio of 12 %, and chlorine gas flow rate of 10 L/min, the rare earth chlorination rate reached 93.26 %. Kinetic studies conducted in the temperature range of 600 to 800℃ revealed that the carbochlorination reaction proceeds in two stages, both controlled by chemical reactions. The apparent activation energy was 12.54 kJ/mol for the first stage and 11.22 kJ/mol for the second stage. Finally, the reaction mechanism of bastnaesite carbochlorination was elucidated based on experimental results and product characterization.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"233 ","pages":"Article 109623"},"PeriodicalIF":4.9,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144662630","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}
引用次数: 0
In situ probing and microstructural evolution mechanisms of hydrogen-derived manganosite (MnO) during oxidative cooling 氧化冷却过程中氢源锰酸盐(MnO)的原位探测和微观结构演化机制
IF 4.9 2区 工程技术
Minerals Engineering Pub Date : 2025-07-18 DOI: 10.1016/j.mineng.2025.109629
Wu Zijian , Yuan Shuai , Zhu Feng , Gao Peng , Li Yanjun , He Jiahao
{"title":"In situ probing and microstructural evolution mechanisms of hydrogen-derived manganosite (MnO) during oxidative cooling","authors":"Wu Zijian ,&nbsp;Yuan Shuai ,&nbsp;Zhu Feng ,&nbsp;Gao Peng ,&nbsp;Li Yanjun ,&nbsp;He Jiahao","doi":"10.1016/j.mineng.2025.109629","DOIUrl":"10.1016/j.mineng.2025.109629","url":null,"abstract":"<div><div>This study first revealed the oxidation pathways and microstructural evolution mechanisms of hydrogen-reduced MnO during air cooling. The results demonstrated that when the oxygen concentration was 9% and the cooling time was 15 min, the cooling temperature range in which MnO was most easily oxidized was from 200 to 400 °C, oxidation rate increased from 7.23 to 34.41%. When the cooling temperature was 300 °C and the oxygen concentration was 9%, MnO had the fastest oxidation rate within 1 –7 min, the oxidation rate rapidly rose from 5.12 to 22.70%. Under controlled cooling conditions (300 °C, 7 min), the MnO oxidation rate was effectively maintained below 15.78% at 5% oxygen concentration. Thermodynamic analysis, thermogravimetric analysis and in-situ XRD indicated that the oxidation reaction sequence of MnO was as follows: MnO → Mn<sub>3</sub>O<sub>4</sub> → Mn<sub>2</sub>O<sub>3</sub>. Notably, the maximum weight gain rate emerged at 345 °C. XPS analysis confirmed the MnO → Mn<sub>3</sub>O<sub>4</sub> transformation during oxidation, while SEM-EDS provided direct evidence through the observed gradual decrease in Mn/O ratios during cooling. BET analysis indicated that higher cooling temperatures decreased particle specific surface area and pore volume, shifting pore distribution from macropores to mesopores through pore occlusion by manganese oxides. This reduced leaching interfacial area and MnO recovery, underscoring the necessity to control MnO oxidation for efficient extraction. Therefore, the oxidation of newborn manganosite should be controlled to the least extent possible.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"233 ","pages":"Article 109629"},"PeriodicalIF":4.9,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144654009","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}
引用次数: 0
Enhancing selective bioflocculation of iron from red Mud: An Eco-Friendly approach through pH optimization for bacterial growth 从赤泥中增强铁的选择性生物絮凝:通过优化pH值来促进细菌生长的环保方法
IF 4.9 2区 工程技术
Minerals Engineering Pub Date : 2025-07-18 DOI: 10.1016/j.mineng.2025.109549
Erian Jeremy, Edy Sanwani, Siti Khodijah Chaerun, Mohammad Zaki Mubarok
{"title":"Enhancing selective bioflocculation of iron from red Mud: An Eco-Friendly approach through pH optimization for bacterial growth","authors":"Erian Jeremy,&nbsp;Edy Sanwani,&nbsp;Siti Khodijah Chaerun,&nbsp;Mohammad Zaki Mubarok","doi":"10.1016/j.mineng.2025.109549","DOIUrl":"10.1016/j.mineng.2025.109549","url":null,"abstract":"<div><div>Red mud, a Bayer process byproduct, holds potential as a secondary iron source (up to 60 % Fe), but its high alkalinity (pH &gt; 10) and fine particle size (P<sub>100</sub> &lt; 2 mm) hinder metal recovery. Selective flocculation is an effective method for concentrating fine iron particles in red mud, requiring pH modification to enhance iron recovery, while bacteria and their metabolites serve as alternative reagents due to their economic benefits and environmental sustainability. This research explores the potential of bioreagents as bioflocculants and pH regulators to neutralize red mud slurry, aiming to produce iron-rich flocs with over 60 % Fe while simultaneously lowering the pH of red mud. Bacteria can function both as bioflocculants and pH regulators because they generate extracellular polymeric substances (EPS) and organic acids through their metabolic processes. The results demonstrated that the use of the <em>Bacillus nitratireducens</em> strain SKC/L-2 bioflocculant in neutralised red mud yielded flocs containing 59.96 ± 1.24 % iron and a recovery rate of 63.95 ± 3.94 %. Adjusting the pH of the inoculum to 3, along with employing the bacteria as a pH regulator, resulted in an increase in the iron content to 60.06 ± 8.00 % and an improvement in the recovery rate to 69.34 ± 8.67 %. However, excessive acidity during bacterial cultivation may negatively impact bacterial growth and metabolic activity. The results of this study are essential for improving mineral processing by allowing for the effective extraction and recovery of iron from red mud using selective bioflocculation, a green method that supports sustainable and environmentally friendly mineral processing practices.</div></div>","PeriodicalId":18594,"journal":{"name":"Minerals Engineering","volume":"233 ","pages":"Article 109549"},"PeriodicalIF":4.9,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144654010","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}
引用次数: 0
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