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Enhanced flotation separation of bastnaesite and monazite by suspension roasting:A study of flotation performance and mechanisms 认领 引用 被引量：3
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作者 Linghui Zhang Wenbo Li +4 位作者 Shaokai Cheng Xiaolong Zhang Junyan Sun Rui Qu Maoyuan Wang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第3期957-968,I0007,共12页
Bayan Obo rare earth mine is the largest light rare earth resource worldwide,primarily extracts rare earth elements(REEs)from mixed RE concentrates with bastnaesite and monazite.Nevertheless,the adoption of the concen... Bayan Obo rare earth mine is the largest light rare earth resource worldwide,primarily extracts rare earth elements(REEs)from mixed RE concentrates with bastnaesite and monazite.Nevertheless,the adoption of the concentrated sulfuric acid roasting metallurgical process has resulted in damage to the environment.Therefore,this paper adopted the method of selective mineral phase transformation(MPT)followed by enhanced micro-flotation.By determining the optimal MPT co nditions,the flotation recovery of bastnaesite-roasted products by the collector(phthalic acid,PA)is improved,and the enhanced separation of bastnaesite with monazite is realized.The results show that with the increase of roasting temperature and time,the bastnaesite decomposition product is CeOF and monazite does not change significantly.Subsequent micro-flotation exhibits a gradual decline in the PA consumption of bastnaesiteroasted products,while the flotation recovery of monazite-roasted products remains poor.The artificial mixed ore experiments result in a CeOF foam product with a content of 94.14%and a recovery of 85.80%,and a monazite tank product with a content of 73.53%and a recovery of 87.87%.Compared with the preroasting ore,the surface and interior of bastnaesite-roasted products develop numerous cracks and porosities,and no obvious structural damage is observed in monazite-roasted particles.As the roasting temperature increases,the mineral particles undergo recrystallization or closure,reducing the specific surface area of bastnaesite-roasted products and enhancing hydrophobicity,leading to diminished PA consumption.Fourier transform infrared and other flotation-relation tests show that PA is chemisorbed on the surface of CeOF.The MPT conditions are optimized in this study,which provides a reference for further advancing the efficient separation of bastnaesite and monazite. 展开更多
关键词 Rare earths Bastnaesite Monazite Mineral phase transformation Enhanced flotation separation Mechanisms
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Development of a novel bastnaesite flotation collector:N-hydroxy-3-methoxy-2-naphthalenecarboxamide derived from 2-hydroxy-3-naphthyl hydroxamic acid(H205) 认领 引用 被引量：2
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作者 Peng Liu You Zhou +1 位作者 Mengjie Tian Wei Sun 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第1期398-408,共11页
Bastnaesite flotation typically uses 2-hydroxy-3-naphthyl-hydroxamic acid(H205) as the primary collector.However,the reactivity of the hydroxyl group bonded to the naphthalene ring in H205 also imparts some collecting... Bastnaesite flotation typically uses 2-hydroxy-3-naphthyl-hydroxamic acid(H205) as the primary collector.However,the reactivity of the hydroxyl group bonded to the naphthalene ring in H205 also imparts some collecting ability towards fluorite and dolomite.The design of N-hydroxy-3-methoxy-2-naphthalenecarboxamide(HMNC) replaces this hydroxyl group in H205 with a methoxy group.In the flotation separation of bastnaesite from fluorite and dolomite,HMNC collector outperforms H205 in terms of selectivity.Under identical experimental settings,HMNC achieves higher adsorption amounts on bastnaesite surface compared to fluorite and dolomite,providing HMNC with a superior selectivity.Studies on Ce3+ and La3+ ions dissolution from bastnaesite surface show that after adding HMNC to bastnaesite slurry,dissolved Ce3+ and La3+ ions re-adsorb onto bastnaesite surface.This suggests that HMNC primarily doe s not adsorb onto bastnaesite surface as its anion,but in the form of positively charged Ce-HMNC and La-HMNC complexes.Consequently,the presence of HMNC causes positive shifts in the surface zeta potentials of bastnaesite.After HMNC adsorption on bastnaesite surface,the binding energies of the Ce element undergo significant positive shifts.This suggests that HMNC primarily does not adsorb onto bastnaesite surface by donating electrons to the Ce3+ ions to form chemical bonds.Firstprinciples calculations reveal that HMNC encounters difficulty adsorbing onto fluorite surface via its Nhydroxyamide group.Additionally,the steric hindrance of the methyl group in HMNC's methoxy group further reduces its collecting ability in fluorite flotation. 展开更多
关键词 Bastnaesite Flotation Collector 2-Hydroxy-3-naphthyl hydroxamic acid(H205) N-hydroxy-3-methoxy-2-naphthalenecarboxamide Rare earths
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Flotation separation of xenotime from silicates using 2-hydroxy-3-naphthyl hydroxamic acid collector and its adsorption mechanism:Experimental and first-principles calculations 认领 引用 被引量：1
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作者 Weiwei Wang Zhengyao Li +3 位作者 Erdou Li Weiyao Zhu Shaochun Hou Yuanyuan Wang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第1期388-397,共10页
Heavy rare earth elements(HREEs) have extensive applications in critical industries.Xenotime(YPO4) is an important phosphatic mineral rich in HREEs.The application of 2-hydroxy-3-naphthyl hydroxamic acid(NHA) as a col... Heavy rare earth elements(HREEs) have extensive applications in critical industries.Xenotime(YPO4) is an important phosphatic mineral rich in HREEs.The application of 2-hydroxy-3-naphthyl hydroxamic acid(NHA) as a collector in the flotation of xenotime has rarely been been explored previously.This study reveals the effect of NHA on the flotation behavior and adsorption mechanism of xenotime.The highgrade rare earth concentrate with significant recovery is achieved at the optimized flotation conditions.Techniques such as Fourier transform-infrared spectra(FTIR),X-ray photoelectron spectroscopy(XPS),and first-principles calculations were employed to clarify the adsorption mechanism of NHA on xenotime.These studies disclose that chemical adsorption occurs through the interaction between Nbonded and carbonyl O atoms,creating a bidentate bond with an Y3+ ion on the xenotime surface.These findings underscore the potential of NHA for selective flotation of xenotime,providing valuable insight into xenotime processing. 展开更多
关键词 Rare earths Xenotime 2-Hydroxy-3-naphthyl hydroxamic acid Flotation Adsorption mechanism
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A review of lepidolite flotation collectors:Fundamentals,applications and perspectives 认领 引用 被引量：1
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作者 Yanyu Tang Guang Han +1 位作者 Qicheng Feng Qian Zhang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第1期1-14,共14页
The rapid advancement of modern science and technology,coupled with the recent surge in new-energy electric vehicles,has significantly boosted the demand for lithium.This has promoted the development and efficient uti... The rapid advancement of modern science and technology,coupled with the recent surge in new-energy electric vehicles,has significantly boosted the demand for lithium.This has promoted the development and efficient utilization of lepidolite as a lithium source.Therefore,the processes for the flotation of lepidolite have been studied in depth,particularly the development and use of lepidolite flotation collectors and the action mechanism of the collectors on the lepidolite surface.Based on the crystal-structure characteristics of lepidolite minerals,this review focuses on the application of anionic collectors,amine cationic collectors(primary amines,quaternary ammonium salts,ether amines,and Gemini amines),and combined collectors to the flotation behavior of lepidolite as well as the adsorption mechanisms.New directions and technologies for the controllable flotation of lepidolite are proposed,including process improvement,reagent synthesis,and mechanistic research.This analysis demonstrates the need for the further study of the complex environment inside lepidolite and pulp.By using modern analytical detection methods and quantum chemical calculations,research on reagents for the flotation of lepidolite has expanded,providing new concepts and references for the efficient flotation recovery and utilization of lepidolite. 展开更多
关键词 lepidolite flotation cationic collector anionic collector combined collector
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Effect of fluoride roasting on copper species transformation on chrysocolla surfaces and its role in enhanced sulfidation flotation 认领 引用
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作者 Yingqiang Ma Xin Huang +5 位作者 Yafeng Fu Zhenguo Song Sen Luo Shuanglin Zheng Feng Rao Wanzhong Yin 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第1期165-176,共12页
It is difficult to recover chrysocolla from sulfidation flotation which is closely related to the mineral surface composition.In this study,the effects of fluoride roasting on the surface composition of chrysocolla we... It is difficult to recover chrysocolla from sulfidation flotation which is closely related to the mineral surface composition.In this study,the effects of fluoride roasting on the surface composition of chrysocolla were investigated,its impact on sulfidation flotation was explored,and the mechanisms involved in both fluoride roasting and sulfidation flotation were discussed.With CaF2as the roasting reagent,Na2S·9H2O as the sulfidation reagent,and sodium butyl xanthate(NaBX)as the collector,the results of the flotation experiments showed that fluoride roasting improved the floatability of chrysocolla,and the recovery rate increased from 16.87%to 82.74%.X-ray diffraction analysis revealed that after fluoride roasting,approximately all the Cu on the chrysocolla surface was exposed in the form of CuO,which could provide a basis for subsequent sulfidation flotation.The microscopy and elemental analyses revealed that large quantities of"pagoda-like"grains were observed on the sulfidation surface of the fluoride-roasted chrysocolla,indicating high crystallinity particles of copper sulfide.This suggests that the effect of sulfide formation on the chrysocolla surface was more pronounced.X-ray photoelectron spectroscopy revealed that fluoride roasting increased the relative contents of sulfur and copper on the surface and that both the Cu~+and polysulfide fractions on the surface of the minerals increased.This enhances the effect of sulfidation,which is conducive to flotation recovery.Therefore,fluoride roasting improved the effect of copper species transformation and sulfidation on the surface of chysocolla,promoted the adsorption of collectors,and improved the recovery of chrysocolla from sulfidation flotation. 展开更多
关键词 sulfidation flotation chrysocolla fluoride roasting copper species transformation enhanced sulfidation
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Di/trialkyl phosphate surfactants for the flotation separation of niobite and calcite or quartz:Superior collecting capacity and selectivity 认领 引用
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作者 FAN Hong-li LI Zhi-long +8 位作者 YANG Dong-yu HOU Shao-chun LI Xia TANG Hai-yan WANG Xiao-ping LIN Tian WANG Ting-ting SUN Wei LI Jian-fei 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第6期2539-2550,共12页
Selective flotation of niobite is crucial for the efficient utilization of niobium resources.In this study,di(2-ethylhexyl)phosphate(DEHPA)was systematically investigated as a selective collector for niobite flotation... Selective flotation of niobite is crucial for the efficient utilization of niobium resources.In this study,di(2-ethylhexyl)phosphate(DEHPA)was systematically investigated as a selective collector for niobite flotation.Microflotation experiments demonstrated that DEHPA exhibits strong collecting ability toward niobite in a weakly acidic to neutral pH range(pH 5.0−8.0),resulting in high flotation recovery.Artificially mixed minerals flotation further confirmed that DEHPA enables efficient separation of niobite from calcite and quartz at pH 6 with an initial dosage of 1×10-4mol/L,indicating its excellent selectivity.Zeta potential measurements revealed a pronounced surface charge shift of niobite after DEHPA adsorption,suggesting specific interfacial interaction.Fourier transform infrared spectroscopy(FTIR)and X-ray photoelectron spectroscopy(XPS)analyses indicated that DEHPA chemically adsorbs onto the niobite surface through chemical reaction between its O atom(s)of the P(=O)—O−groups and Nb(V)or Fe(Ⅱ/Ⅲ)species on niobite surface,generating the Nb(Ⅴ)or Fe(Ⅱ/Ⅲ)—O—P bonds,thereby enhancing mineral hydrophobicity.These results elucidate the selective adsorption mechanism of DEHPA on the niobite surface and provide theoretical guidance for the development of efficient phosphate collectors for niobium mineral flotation. 展开更多
关键词 di(2-ethylhexyl)phosphate niobite calcite quartz flotation separation selective adsorption
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Thermal decomposition of bastnaesite in an inert atmosphere and influence on flotation behavior 认领 引用
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作者 Qiang Zhang Yongsheng Sun +2 位作者 Peng Gao Zhao Cao Yuexin Han 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第6期1823-1837,共15页
This study aimed to elucidate the influence of thermal decomposition under an inert atmosphere on the phase composition,microstructure,and flotation performance of bastnaesite.Experiments showed that decomposition was... This study aimed to elucidate the influence of thermal decomposition under an inert atmosphere on the phase composition,microstructure,and flotation performance of bastnaesite.Experiments showed that decomposition was strongly temperature-dependent.After complete decomposition,the release of CO2 increased the rare earth oxide grade from 72.90wt%to 86.83wt%,accompanied by an increase in the Ce oxidation degree.Major decomposition products included rare earth oxyfluoride(REOF),rare earth trifluoride(REF3),and Ce7O12,with some products showing low crystallinity.The decomposition damaged the particle structure,resulting in the extensive lamellar cracking,a significant increase in specific surface area,and partial fragmentation of the particles.Flotation tests revealed that optimum recovery was achieved at pH 8.00–9.00.However,thermal decomposition increased the initial pulp pH to almost 11.00,making pH adjustment difficult.Salicylhydroxamic acid(SHA)was adsorbed on the surfaces by both physical and chemical interactions,with chemical adsorption being significantly enhanced after decomposition.During flotation,SHA was distributed not only on particle surfaces but also in internal pores after decomposition.Due to the phase and microstructural changes,the required dosage of SHA increased from 20 mg·L−1 for the raw ore to 250 mg·L−1.These results provide insights into the development of reagents suitable for the flotation of bastnaesite roasting products. 展开更多
关键词 bastnaesite thermal decomposition phase transformation flotation behavior adsorption mechanism
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Interaction mechanism of a novel binary collector L-06 composed of lauric acid and lauryl alcohol for bastnaesite flotation 认领 引用
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作者 Zhenyue Zhang Xinyi Li +3 位作者 Wenda Guo Defeng Liu Hanjun Wu Ru'an Chi 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第6期1956-1965,I0009,共10页
As the predominant method for bastnaesite separation,froth flotation relies critically on the selection of flotation reagents to achieve optimal mineral recovery.In order to overcome the shortcomings of single collect... As the predominant method for bastnaesite separation,froth flotation relies critically on the selection of flotation reagents to achieve optimal mineral recovery.In order to overcome the shortcomings of single collectors in adapting to complex and varied minerals,blending two or more reagents to develop composite collectors has emerged as a promising strategy for enhanced mineral selectivity.In this paper,a novel binary collector comprising lauric acid and lauryl alcohol was developed for bastnaesite flotation.Bench-scale flotation tests process with one roughing,three cleaning,two scavenging(1R-3C-2S)were performed.The results indicate that under the condition of 125 mg/L binary collector and 120 mg/L sodium silicate,88.14%bastnaesite recovery with 51.70%REO grade can be achieved.X-ray diffraction(XRD)and scanning electron microscopy(SEM)analyses confirm that the concentrate is predominantly bastnaesite,whereas tailings primarily comprise fluorite,quartz and wollastonite.Simultaneous thermal analysis attests that binary collector can adsorb on bastnaesite surfaces,Zeta potential analysis demonstrates electrostatic adsorption of binary collector L-06 on bastnaesite surfaces.Fourier transform infrared(FTIR)and X-ray photoelectron spectroscopy(XPS)analyses confirm that collector L-06 adsorbs on bastnaesite surfaces via hydrogen bonding and chemical adsorption.Consequently,the binary collector demonstrates superior collecting on bastnaesite surfaces through synergistic effects of electrostatic interaction,hydrogen bonding and chemical bonding at pH 4.50,providing valuable insights for developing high-efficiency composite collectors in bastnaesite flotation. 展开更多
关键词 Rare earths Bastnaesite Binary collector Flotation
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The flotation separation of fluorite and calcite particles facilitated by a novel fatty acid-based surfactant 认领 引用
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作者 LIU Peng TIAN Yu-hui +1 位作者 TIAN Meng-jie SUN Wei 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第3期1188-1202,共15页
Oleic acid is a commonly used fatty acid collector in fluorite flotation,known for its effective collecting performance and cost-effectiveness,but with a limited selectivity.In this study,a novel collector,α-sulfonat... Oleic acid is a commonly used fatty acid collector in fluorite flotation,known for its effective collecting performance and cost-effectiveness,but with a limited selectivity.In this study,a novel collector,α-sulfonate group mixed acid(α-SMA),is introduced.The flotation test results demonstrate that the α-SMA collector provides significantly better selectivity in fluorite flotation.Specifically,the α-SMA collector exhibits a similar collecting ability to oleic acid for fluorite;however,its capacity to collect calcite is substantially lower.Zeta potential tests indicate that,under identical dosage conditions,α-SMA adsorbs in greater quantities on fluorite than on calcite.As a result,fluorite exhibits substantially higher flotation recoveries versus calcite with α-SMA collector.X-ray photoelectron spectroscopic analysis suggests that α-SMA facilitates a higher electron donation to Ca2+ions on fluorite compared to calcite surface,forming stronger chemical bonds with fluorite surface.This enhanced interaction leads to stronger adsorption of α-SMA on fluorite.Furthermore,when α-SMA adsorbs solely through its sulfonic group,its carbon chain is positioned almost parallel to calcite surface.This configuration significantly reduces the hydrophobicity of the calcite surface,leading to very low calcite recovery rates with α-SMA collector. 展开更多
关键词 fluorite flotation collector oleic acid fatty acid α-sulfonate group
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Effects and mechanisms of Ca2+and Mg2+on the flotation of columbite-tantalite in NaOL systems 认领 引用
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作者 Zhengqiang Cao Runqing Liu +2 位作者 Qilin Zhai Mengjie Tian Wei Sun 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第3期809-819,共11页
Tantalum(Ta)and niobium(Nb)are key strategic metals used in the aerospace,steel,and chemical industries.Columbite‒tan-talite is the primary Ta-and Nb-containing mineral.Flotation is an effective and practical approach... Tantalum(Ta)and niobium(Nb)are key strategic metals used in the aerospace,steel,and chemical industries.Columbite‒tan-talite is the primary Ta-and Nb-containing mineral.Flotation is an effective and practical approach for preconcentrating columbite-tantalite.However,the inevitable introduction of Ca,Mg,and other ions from process water and mineral dissolution during beneficiation can significantly affect the flotation performance of columbite‒tantalite.This study systematically investigated the effects of Ca2+and Mg2+ on columbite‒tantalite flotation in a sodium oleate(NaOL)system.Flotation experiments revealed that,at pH=10,the addition of Ca2+ and Mg2+markedly suppressed the flotation of columbite–tantalite,reducing the recovery by 94.86%and 92.55%,respectively.Characterization revealed that NaOL forms a hexagonal ring structure with Mn sites on the columbite‒tantalite(100)crystal surface.However,Ca2+ and Mg2+ions interfere with the chemical adsorption of NaOL by reacting with it to form oleate precipitates,which subsequently cover the mineral surface.Therefore,excess NaOL did not facilitate the effective flotation of columbite‒tantalite.Furthermore,NaOL,as compared with the columbite‒tantalite surface,tended to interact with Ca2+and Mg2+to deactivate the collector.This paper elucidates the inhibitory effects of Ca2+and Mg2+on the flotation of columbite‒tantalite.Consequently,the selective removal of metal ions,such as Ca2+ and Mg2+,from the slurry is essential to improve both the flotation efficiency and recovery of columbite‒tantalite,particularly when processing ores with high water hardness or containing easily leachable metal ions. 展开更多
关键词 calcium ion magnesium ion columbite-tantalite flotation depression mechanism density functional theory calculation
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Radical-induced selective oxidation and depression of pyrite in copper flotation 认领 引用
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作者 Richard Li Jie Lee Wen-Da Oh +1 位作者 Zhiyong Gao Yongjun Peng 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第2期507-517,共11页
Selective depression of pyrite remains a major bottleneck in copper flotation,particularly when high-pyrite ores are processed and saline water is used.In such environments,conventional approaches using lime and inert... Selective depression of pyrite remains a major bottleneck in copper flotation,particularly when high-pyrite ores are processed and saline water is used.In such environments,conventional approaches using lime and inert grinding media often fail to discriminate ef-fectively between pyrite and valuable copper minerals due to strong copper activation on pyrite surfaces.This study introduced a novel approach using inorganic radicals generated from peroxymonosulfate(PMS)to selectively oxidize and depress pyrite.Flotation tests with synthetic high-pyrite ore blends showed that PMS significantly reduced pyrite recovery while maintaining or improving chalcopyrite flot-ation.Ethylenediaminetetraacetic acid(EDTA)extraction confirmed selective oxidation of pyrite,and electron paramagnetic resonance(EPR)spectroscopy identified hydroxyl(·OH)and sulfate(SO4·-)radicals as the dominant reactive species.Iron ions from grinding me-dia and mineral surfaces were identified as key activators of PMS.A major insight was pyrite’s dual role,acting both as a radical scav-enger and an activator,which made it highly reactive and susceptible to radical-induced oxidation.This process converted surface copper-sulfur species into copper hydroxides,effectively suppressing pyrite flotation.While previous studies have applied EPR to detect radicals in simplified activator/precursor systems,this study provides the first direct mechanistic evidence of radical-driven selectivity in flotation by detecting inorganic radicals in a complex flotation slurry,thereby demonstrating their persistence under industrially relevant conditions and establishing a foundation for more effective and targeted flotation strategies. 展开更多
关键词 selective flotation radical oxidation peroxymonosulfate pyrite depression chalcopyrite recovery
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Effects of oxidation roasting on surface characteristics and flotation behavior of bastnaesite 认领 引用
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作者 Qiang ZHANG Yong-sheng SUN +2 位作者 Zhao CAO Peng GAO Wen-bo LI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第6期1875-1890,共16页
The effect of oxidation roasting on the surface characteristics and flotation behavior of bastnaesite was investigated.Oxidation roasting experiments were performed at various temperatures,time,and O2 concentration... The effect of oxidation roasting on the surface characteristics and flotation behavior of bastnaesite was investigated.Oxidation roasting experiments were performed at various temperatures,time,and O2 concentrations.The results indicated that increasing the temperature promoted the thermal decomposition of bastnaesite,resulting in the formation of Ce7O12,RE2O3,and REF3 as the main phases.Furthermore,oxidation roasting induced the formation of long,narrow,and nearly parallel cracks within the particles,increasing the porosity and facilitating partial particle fragmentation.During flotation,the concentration of dissolved rare earth ions increased significantly,and surface hydrolysis led to the formation of rare earth hydroxyl compounds.The complete decomposition of bastnaesite increased the required collector dosage to achieve a recovery above 85.00%.This increase might be attributed to the enhanced particle wettability,the altered adsorption mechanism of the collector,and the deeper penetration of the collector into the porous structure. 展开更多
关键词 oxidation roasting bastnaesite flotation behavior phase transition microstructure evolution surface chemis
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Probing the interfacial role of hydrolysed polymaleic anhydride for efficient target adsorption in scheelite–calcite flotation system:Experimental application and atomic-scale mechanisms 认领 引用
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作者 Qing Shi Binbin Li Guofan Zang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第4期1094-1103,共10页
Tungsten,a strategic non-ferrous metal critical for advanced industrial applications,predominantly exists as underutilized scheelite resources characterized by fine-grained intergrowths with calcite that are challengi... Tungsten,a strategic non-ferrous metal critical for advanced industrial applications,predominantly exists as underutilized scheelite resources characterized by fine-grained intergrowths with calcite that are challenging to separate.This study deciphers the atomic-scale mechanism underlying the selective flotation separation of scheelite from calcite mediated by hydrolyzed polymaleic anhydride(HPMA),a novel environmentally benign reagent,through integrated experimental characterization and computational simulations.Micro-flotation assays quantitatively demonstrated HPMA's exceptional selectivity,suppressing calcite recovery from 91.64%to 18.61%at pH 7(10 mg·L-1dosage)while preserving scheelite floatability.Fourier transform infrared spectroscopy revealed HPMA preferentially adsorbs on calcite,efficiently hindering sodium oleate(NaOL)attachment,whereas NaOL selectively binds to scheelite.X-ray photoelectron spectroscopy analysis confirmed carboxyl(–COO-)group chemisorption at calcite's Ca sites,evidenced by a 0.26 eV negative shift in Ca 2p3/2binding energy and new Ca–O bond formation.Density functional theory(DFT)simulations quantified adsorption energetics:HPMA exhibited stronger affinity for calcite(104)surfaces(-1166.441 k J·mol-1)versus scheelite(112)(335.180 k J·mol-1).Mulliken bond population analysis quantified interfacial bonding nature.The calcite–HPMA interface formed polar covalent bonds(populations 0.23–0.28),contrasting with NaOL's ionic interactions(population 0.13)on scheelite.This covalent advantage enables HPMA to preferentially passivate calcite surfaces,suppressing NaOL co-adsorption and facilitating selective scheelite recovery through differential surface reactivity modulation. 展开更多
关键词 scheelite calcite flotation separation selective adsorption atomic-scale mechanism density functional theory
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Optimizing rheological properties of fine spodumene pulp by sodium p-styrene sulfonate and regulating its flotation behavior 认领 引用
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作者 He-peng ZHOU Jiang-feng GUO +5 位作者 Bo-yuan ZHANG Wei GUO Xian-ping LUO Xin OUYANG Dong-dong WEI Lou-yan SHEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第8期2443-2454,共12页
To optimize pulp rheological properties and enhance fine spodumene recovery,sodium p-styrene sulfonate(SPS)was employed as a rheological modifier.Through rheological analysis,flotation tests,and EDLVO theoretical calc... To optimize pulp rheological properties and enhance fine spodumene recovery,sodium p-styrene sulfonate(SPS)was employed as a rheological modifier.Through rheological analysis,flotation tests,and EDLVO theoretical calculations,the mechanism of SPS in regulating pulp rheology and improving spodumene flotation performance was systematically elucidated.The results show that,as the size of mineral particles in the slurry decreases,both the shear yield stress and the apparent viscosity of the slurry increase,which can negatively affect the flotation recovery of spodumene.However,after adding SPS,the zeta potential of fine spodumene particles decreases from−48.93 to−50.33 mV,while that of feldspar particles decreases from−65.33 to−75.14 mV.The repulsive force among 10μm particles increases from 4.3 to 7.1 nN,whereas the apparent viscosity decreases from 1.069 to 0.861 mPa·s.The strengthened electrostatic repulsion between spodumene and feldspar particles effectively reduces pulp viscosity and shear yield stress.These modified rheological characteristics create favorable conditions for improved flotation performance of fine spodumene,ultimately enhancing separation efficiency. 展开更多
关键词 spodumene fine particle rheology of pulp flotation separation EDLVO theory
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Synthesis and application of a quaternary ammonium ionic liquid collector for flotation separation of fluorite and bastnaesite 认领 引用 被引量：1
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作者 Yanxu Wang Siyuan Yang +4 位作者 Qianqian Wang Bo Chen Shenxu Bao Wenbo Li Cheng Liu 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第3期946-956,I0007,共11页
The efficient flotation separation of rare earth elements(REEs)from gangue minerals is crucial in mineral processing.This study synthesized a quaternary ammonium salt ionic liquid collector,tetrabutylammonium salicylh... The efficient flotation separation of rare earth elements(REEs)from gangue minerals is crucial in mineral processing.This study synthesized a quaternary ammonium salt ionic liquid collector,tetrabutylammonium salicylhydroxamate(T-S),and investigated its performance in separating bastnaesite and fluorite.T-S was synthesized from salicylhydroxamic acid(SHA)and tetrabutylammonium chloride(TBAC),and its molecular structure was characterized using Fourier transform infrared(FTIR)spectroscopy.Microflotation tests indicate that T-S outperforms SHA and TBAC in both collecting ability and selectivity for bastnaesite.Adsorption,zeta potential,and infrared spectroscopy measurements reveal that T-S exhibits stronger adsorption on bastnaesite compared to SHA and TBAC.X-ray photoelectron spectroscopy(XPS)and molecular dynamics simulations(MDS)results confirm that chemical adsorption occurs between Ce on the bastnaesite surface and the-C(=O)NHOH groups of T-S.Moreover,the interaction between T-S and the bastnaesite surface is stronger than that with the fluorite surface.This work provides valuable insights for designing ionic liquid collectors for the flotation separation of bastnaesite and fluorite. 展开更多
关键词 Bastnaesite Fluorite Rare earths Flotation separation lonic liquid collector
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Deep learning-driven autonomous spodumene flotation:Integrating theoretical modeling and YOLOv11-M vision systems with semi-industrial trial validation 认领 引用 被引量：1
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作者 Tianyou Yu Yimin Zhu +2 位作者 Jie Liu Yuexin Han Yanjun Li 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第7期2338-2355,共18页
Driven by the global energy transition and industrial intelligence,the mining industry is evolving towards smarter and more efficient methods.In mineral processing,particularly flotation,traditional techniques rely he... Driven by the global energy transition and industrial intelligence,the mining industry is evolving towards smarter and more efficient methods.In mineral processing,particularly flotation,traditional techniques rely heavily on human experience,facing challenges due to complexity and variability.This study proposes an intelligent control system based on machine vision for spodumene flotation.It introduces an improved YOLOv11-M model with real-time foam detection and decision optimization,enhancing flotation efficiency.The research utilizes a dataset of over 100000 foam images and deep learning to detect foam states.Innovations include using EfficientNetV2for feature extraction the C3k2_LGP module for enhanced frequency perception,and the Saga-PIoU loss function for better robustness under complex conditions.Experimental results show improvements in mean average precision(mAP)(by 1.9%),precision(0.3%),and recall(2.5%).YOLOv11-M outperforms other models,with a significant frames per second(FPS)increase(135.3)and improved accuracy.A semi-industrial trial demonstrated YOLOv11-M's ability to enhance flotation recovery and grade.Not only did the grade improve,but the flotation process s stability was also significantly enhanced.The foam velocity distribution became more reasonable,and the fluctuations in grade and recovery were significantly reduced,with standard deviations deereasing by 65% and 90%,respectively.These findings indicate that YOLOv11-M not only improves the efficiency and stability of the flotation process but also provides an intelligent,automated solution for the industry,with the potential for widespread application in large-scale mining flotation processes.The opensource code and dataset will be released at:http://gffzz188fe103f8f1460asn6fxqfvxx6cb6u5p.ffgz.tsg.suse.edu.cn/users/ytyyty368-arch. 展开更多
关键词 spodumene flotation machine vision YOLOv11-M deep learning intelligent control
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Selectivity of composite thionocarbamate collector in flotation separation of chalcocite from pyrite in low-alkaline pH pulp 认领 引用
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作者 ZHAO Xin-miao YAO Xiang +6 位作者 WU Yan-ming YANG Yuan-kun YU Sheng-li OUYANG Chong-zhong LÜBing-chao GU Guo-hua WANG Yan-hong 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第4期1583-1596,共14页
The flotation separation of high pyrite content secondary copper ores faces challenges including elevated pH levels,poor xanthate selectivity,and higher costs associated with its combination with Z-200.In this work,a ... The flotation separation of high pyrite content secondary copper ores faces challenges including elevated pH levels,poor xanthate selectivity,and higher costs associated with its combination with Z-200.In this work,a composite thionocarbamate collector(TJ-215),with low-cost raw materials and a short synthetic route,showed a better selectivity for chalcocite than Z-200 when pH>8.Zeta potential analysis indicated a stronger interaction between TJ-215 and chalcocite.These results were achieved through the synergistic coordination of NH-C=S and C=N-OH in TJ-215 molecule,compared with the single thiourea group,NH-C=S,in Z-200 molecule.At low-alkaline condition,the NH-C=S in TJ-215 formed Cu-S,Cu-N bonds with Cu atoms,and the C=N-OH combined with Cu to form a Cu-O bond.The results of this study provide guidance on the replacement of Z-200 by TJ-215 in the separation of chalcocite from pyrite in weak alkaline conditions. 展开更多
关键词 composite thionocarbamate chalcocite pyrite flotation adsorption mechanism
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Unveiling the interfacial adsorption mechanism of a novel low-temperature resistant collector in the flotation of spodumene from feldspar 认领 引用
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作者 Hui Shao Bingqiao Yang +4 位作者 Yifan Zhang Huihua Luo Nasriddinov Zamoniddin Zainiddinovich Weijun Peng Huanyu Zhu 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第7期1493-1503,共11页
It is challenging to remove feldspar from spodumene at low temperature due to the poor collecting ability and selectivity of conventional collector.In this work,Glycolic acid ethoxylate oleyl ether(GAEOE)was evaluated... It is challenging to remove feldspar from spodumene at low temperature due to the poor collecting ability and selectivity of conventional collector.In this work,Glycolic acid ethoxylate oleyl ether(GAEOE)was evaluated as a low-temperature resistant collector in the flotation separation of spodumene and feldspar.The flotation performances and the interfacial interaction mechanisms were comprehensively investigated.Micro-flotation experiments showed that GAEOE could realize the efficient separation between spodumene and feldspar at low temperature,producing high-quality concentrate with Li2O grade and recovery reached 6.02%and 81.22%,respectively.Contact angle,induction time and bubble-mineral interaction force measurements proved that GAEOE significantly increased the adhesion force and attachment probability between air bubbles and spodumene,while it exerted negligible influence on feldspar.Zeta potentials and in situ microcalorimetry tests confirmed the stronger affinity of GAEOE toward Caactivated spodumene than feldspar.Adsorption capacity and turbidity measurements revealed that GAEOE exhibited more stable adsorption with low sensitivity to temperature changes than sodium oleate(NaOL),due to the better solubility and superior dispersion stability at low temperature.XPS and DFT analysis revealed a stable bidentate configuration involving synergistic interactions between the O atoms of C-O and C=O groups within GAEOE and Al as well as Ca sites on Ca-activated spodumene surface.These results suggested GAEOE was a promising alternative for conventional fatty acid collectors for spodumene flotation in temperature-sensitive environment. 展开更多
关键词 Flotation Spodumene and feldspar Temperature compatible collectors DFT calculations
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Mechanistic insights into the synergistic depression of pyrite by H 2O2 and Fe3+in low-alkalinity Cu-S flotation separation 认领 引用
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作者 Yubin Sun Qian Zhang +2 位作者 Shuming Wen Yongchao Miao Ping Zhang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第6期1838-1855,共18页
Conventional lime depressants used in copper sulfide flotation separation are limited by persistent challenges of scaling,corrosion,and compromised target-metal recovery,which necessitates the development of efficient... Conventional lime depressants used in copper sulfide flotation separation are limited by persistent challenges of scaling,corrosion,and compromised target-metal recovery,which necessitates the development of efficient and green alternatives.This study demonstrates the synergistic depression of pyrite by H2O2/Fe3+under low-alkalinity conditions.The complementary action pathways were systematically elucidated by multiscale characterization techniques including mono-and mixed-mineral flotation tests and surface and solution analysis.Flotation test results showed that the combined depressant system H2O2/Fe3+enabled efficient separation of chalcopyrite and pyrite.Under the optimal mixed-mineral separation conditions of 0.025vol%H2O2and 2×10−5mol/L Fe3+,the artificial mixed-mineral flotation test yielded a copper concentrate with a chalcopyrite grade of 30.51wt%,while chalcopyrite recovery remained stably above 88%.Investigations into the depression mechanism and surface hydrophobicity revealed that H2O2selectively oxidized disulfide()to sulfate(SO42-)while facilitating Fe2+conversion to Fe3+,generating hydrophilic Fe–SO4/Fe–OOH/Fe–OH coatings that disrupted natural surface natural hydrophobicity.Simultaneously,Fe3+hydrolyzed to hydroxyl complexes([Fe(OH)2]+and Fe(OH)3),which electrostatically adsorbed onto and chemically bonded to H2O2-oxidized pyrite surfaces,forming dense hydrophilic layers.The faster oxidation of pyrite resulted from its fundamental structural properties,specifically its high surface electronic activity and relatively weak Fe–S bonds,which collectively rendered it more susceptible to H2O2attack,unlike chalcopyrite with its stable lattice and strong covalent Cu–S bonds.Consequently,the robust covalent Cu–S bonds of chalcopyrite effectively resisted oxidation,while its limited Fe3+adsorption capacity favored the adsorption of sodium ethyl xanthate(SEX)at copper-active sites.As a result,the H2O2/Fe3+system exerted only minimal depression on chalcopyrite,providing a sound theoretical basis and a practical technical strategy for the selective separation of copper-sulfide ores.Furthermore,the findings of this study contribute to the development of low-alkalinity,high-selectivity sulfide-ore processing methods,demonstrating considerable potential for industrial application. 展开更多
关键词 chalcopyrite pyrite low alkalinity flotation separation depression mechanism
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The role of dissolved metal ions in rare earth mineral flotation:A review 认领 引用
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作者 Isaac Douglas Manoj Mohanty 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第6期1668-1692,I0001,共25页
Rare earth minerals(REMs)such as bastnaesite and monazite are the primary sources of light rare earth elements critical to modern technologies and clean energy applications.Froth flotation remains the most widely used... Rare earth minerals(REMs)such as bastnaesite and monazite are the primary sources of light rare earth elements critical to modern technologies and clean energy applications.Froth flotation remains the most widely used and effective method for their beneficiation.However,dissolved metal ions-introduced through gangue mineral dissolution or recycled process water-can significantly influence flotation performance through complex,pH-dependent inte ractions with mineral surfaces and flotation reagents.This review examined the effects of key trivalent ions(Fe3+,Al3+,La3+),divalent ions(Ca2+,Mg2+,Sr2+,Ba2+,Co2+,Pb2+),and anionic species(F-,SO42-)on th e flotation behavior of bastnaesite and monazite.While many of these ions are known to depress flotation under specific pHdependent conditions,others enhance recovery depending on the interplay between pH and collector chemistry.Specifically,Fe3+and La3+promote monazite flotation under mildly alkaline conditions(pH8-9),whereas Pb2+,Ba2+,Co2+,and Fe3+enhance bastnaesite flotation in similar pH ranges.Ca2+and Fe3+exhibit dual roles-either depressing or activating bastnaesite flotation-depending on their interactions with collectors and the prevailing pH.In particular,Ca2+has been shown to cause unintended synergistic depression of target minerals when combined with depressants such as sodium silicate under alkaline pH conditions(pH 8-9).By emphasizing the pH-sensitive and reagent-specific behavior of metal ions,this review highlights the need for improved unavoidable metal ion control strategies in REM flotation circuits.It also identifies key research gaps in understanding solution-phase ion-reagent interactions and multi-ion effects.Addressing these challenges is essential for developing more selective,efficient,and sustainable flotation processes-offering practical guidance for the rare earth processing industry. 展开更多
关键词 Flotation Rare earths Metal ions Adsorption pH Gangue species
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