International Journal of Mining Science and Technology
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2024
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IF 11.7
Zhonghua Xue,Yali Feng,Haoran Li,Jinrong Ju,Xingquan Du
In order to alleviate the pressure on the supply of lithium resources, this research proposes the use of binary/ternary collectors with high selectivity and collecting ability to enhance the flotation purification of low-grade zinnwaldite ore. The binary collector is a mixture of dodecylamine polyoxyethylene ether and DL-2-octanol. A binary collector is added first, followed by sodium oleate, known as a ternary collector. Under acidic conditions, the recovery of Li 2 O in the concentrate was increased by 8.26% with the binary collector and 13.70% with the ternary collector, compared to the dodecylamine polyoxyethylene ether. The binary collector enhanced the dispersibility of the single collector, while co-adsorption strengthened the hydrophobic nature of the zinnwaldite surface. Consequently, zinnwaldite particles, after the application of binary collector, displayed inter-particle flocculation and attachment to bubbles within 60×10 −9 m compared to other particles. Ternary collector exhibited the capacity to lower critical micelle concentration and surface tension, subsequently inducing a denser and thicker hydrophobic layer through electrostatic forces, hydrophobic interactions, and chemical reactions. The objective of this research is to facilitate the recovery of lithium resources from low-grade ores in order to meet the needs of sustainable development.
研究领域:
矿物加工工程
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材料科学与工程
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Zheyi Zhang,Fen Jiao,Qian Wei,Guoyan Liang,Wenqing Qin
Lepidolite deposits contain abundant fine-grained minerals formed during mineralization, weathering, and milling processes, making the flotation process susceptible to the influence of gangue slime, particularly feldspar. In this study, the effects of the novel Anti-Slime Collector DDA (Dodecylamine)/HQ330 and the mixed collector DDA/NaOl (sodium oleate) on lepidolite flotation in the presence of feldspar slime were compared. The results demonstrated that DDA/HQ330 effectively alleviated the negative impact of feldspar slime on lepidolite flotation. The mechanism was investigated using Scanning Electron Microscopy, three-phase contact line tests, Atomic Force Microscopy tests, adsorption amount tests, zeta potential tests, and surface tension tests. The results suggested that feldspar slime influenced lepidolite flotation by consuming reagents. There was a higher amount of adsorption on the lepidolite surface when using DDA/HQ330 compared to DDA/NaOL. DDA/HQ330 readily adsorbed on the feldspar slime surface and had minimal impact on the zeta potential of the feldspar. Additionally, DDA/HQ330 displayed lower surface tension, leading to the formation of more stable bubbles, which could potentially enhance flotation performance.
研究领域:
矿物加工工程
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材料科学与工程
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产品关联
DOI
高影响因子
MINERALS ENGINEERING
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2023
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IF 4.8
Xiaopeng Chi,Zihan Ye,Hao Wang,Wei Weng,Shuiping Zhong
The nature of copper slag flotation is unique due to the high temperature in the flotation pulp and high metallic copper content in the feed. Despite its great potential for valorizing slag, copper slag flotation remains challenging due to the deactivation of traditional dithiocarbonate (DTC) collectors (e.g., butyl xanthate) under high temperatures. DTC collectors also respond poorly to the metallic copper due to the difficulty in forming stable chemical adsorption. In this work, possible deactivation mechanisms of DTC collectors are proposed, i.e., decomposition, oxidation and thermal desorption. A novel furfuryl trithiocarbonate (FTTC) collector was designed and synthesized. Spectral characterization using FT-IR, H-NMR and ion trap MS confirmed the molecular structure of the synthesized collector and its decomposition, oxidation and polymerization products at 55 °C. The novel collector features high-temperature resistance and high metallic copper recovery, as revealed by the single mineral flotation experiments of chalcopyrite, pyrite and metallic copper at both 25 °C and 55 °C. The high collecting ability and selectivity of our collector were explained by E HOMO and E LUMO values using first-principles calculations. Our work provides guidance for the design of collectors exhibiting high-temperature resistance for copper slag flotation, aims at constituting a meaningful contribution for unlocking potential copper resources in copper slag.
研究领域:
矿物加工工程
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材料化学
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DOI
高影响因子
Minerals
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2017
·Vol. 7
·期 2
·20
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IF 2.088
Zhili Li,Feng Rao,Shaoxian Song
To separate one base metal mineral from another by flotation, it is indispensable to identify chemical reagents that specifically interact with the surface metal sites of one mineral or a group of minerals. This work studies the interactions of chelating collectors which offer the best potential for collecting abilities and mineral specificity with a typical refractory oxide mineral (malachite). Zeta potential, adsorption and Fourier transform infrared (FTIR) measurements are applied to differentiate the interactions of salicylaldoxime and salicyl hydroxamate on the malachite surface. Salicylaldoxime and salicyl hydroxamate are of molecular structures that resemble each other, but with different bond distances in the ligand atoms which result in their unusual adsorption behavior and collecting ability. Thus, the flotation of malachite behaves differently with the two chelating collectors. This study might provide useful clues for designing novel collectors in base metal oxide flotations.Keywords:malachite;flotation;chelating collector;adsorption
研究领域:
矿物加工工程
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化学工程
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产品关联
DOI
高影响因子
Processes
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2023
·Vol. 11
·期 3
·703
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IF 3.5
Liang Shen,Jiabao Gong,Yifang Liu,Erle Qiao
The molecular structure of cationic surfactants is closely related to their flotation performance. In this paper, three cationic surfactants with different head group structures were selected as collectors of kaolinite, and the substituent effects were studied by the DFT method. The DFT calculation results showed that increasing the number of substituents in the dodecylamine head group can significantly increase its surface and head group charge. Dodecylamine has the lowest LUMO orbital energy, so dodecylamine has the strongest electron attraction ability and the strongest interaction with kaolinite. Electron density differential showed that there was an area of electron aggregation between the collector and the surface of the kaolinite. The interaction energy of DDA on kaolinite surfaces was greater than that of the other two collectors, indicating that the adsorption of DDA on the surface of kaolinite was more stable. Flotation results showed that higher a kaolinite yield was obtained in the presence of dodecyl dihydroxyethyl methyl ammonium chloride. The calculated results of the solvent-accessible surfaces, the head group charge, and the number of bonds between the collector and the kaolinite show good consistency with the actual flotation results of the three collectors, which can be used as a screening index for kaolinite flotation collectors.Keywords:kaolinite;flotation;collector;adsorption;DFT calculation
研究领域:
化学工程
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材料科学
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表面化学
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DOI
高影响因子
Royal Society Open Science
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2019
·Vol. 6
·期 5
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IF 2.515
Pingfeng Fu,Gen Li,Xiaoting Wu,Xiaofeng Lin,Bolan Lei
The decomposition of toxic flotation reagents upon UV185+254 nm irradiation was attractive due to operational simplicity and no dosage of oxidants. In this work, the degradation of typical thiol collectors (potassium ethyl xanthate (PEX), sodium diethyl dithiocarbamate (SDD), O-isopropyl-N-ethyl thionocarbamate (IET) and dianilino dithiophoshoric acid (DDA)) was investigated by UV185+254 nm photolysis. The degradation efficiencies and mineralization extents of collectors were assessed. The formation of CS2 and H2S byproducts was studied, and the mechanisms of collector degradation were proposed under UV185+254 nm irradiation. The PEX, SDD and IET were decomposed with nearly 100% removal upon 75 min of UV185+254 nm irradiation. The decomposition rate constants decreased in the order SDD > PEX > IET ≫ DDA, and the DDA was the refractory collector. After 120 min of UV185+254 nm irradiation, 15−45% of carbon and 25−75% of sulfur of collectors were completely mineralized, and the mineralization extent decreased in the order PEX > SDD > IET > DDA. The percentage of gaseous sulfur (CS2 and H2S) ranged from 0.48 to 4.85% for four collectors, showing the fraction of emitted sulfur byproducts was small. The aqueous CS2 concentration increased in the first 10−20 min, and was decreased to a low level of 0.05–0.1 mg l−1 at 120 min. Two mechanisms, i.e. direct UV254 nm photolysis and indirect oxidation with free radicals, were responsible for collector decomposition in the UV185+254 nm photolysis.
研究领域:
环境科学
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化学工程
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DOI
PubMed
高影响因子
ADVANCED POWDER TECHNOLOGY
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2025
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IF 4.2
Yonghong Xu,Lingyun Huang,Mei Zhang,Jianhan Zhou,Bo Hu,Louyan Shen,Jian Liu,Dandan Wu,Siyuan Yang
The challenging separation of cassiterite from calcite by flotation stems from their similar floatability, requiring innovative combined collectors to improve process efficiency and selectivity. Here, a novel PTPA/FeCl 3 collector was developed by synthesizing p- tert -butylphenylhydroxamic acid (PTPA) with FeCl 3 . Microflotation tests showed that using PTPA alone yielded 81.80% SnO 2 and 45.87% CaO recoveries, whereas PTPA/FeCl 3 increased SnO 2 recovery to 89.51% while reducing CaO to 27.02%, demonstrating superior separation efficiency. Contact angle measurements confirmed enhanced cassiterite hydrophobicity from the mixed collector. SEM-EDS and XPS analyses revealed effective chemisorption of PTPA/FeCl 3 on cassiterite, where PTPA and FeCl 3 formed a stably adsorbed chelate complex. In contrast, calcite exhibited weak and unstable adsorption. The mixed collector thus combines strong collecting capability with high selectivity for cassiterite over calcite.
研究领域:
矿物加工工程
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表面化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Longfu Dai,Jian Liu,Da Li,Jiamei Hao,Hulin Gao
The hydroxamic acid reagents are extremely pervasive in the collector of scheelite flotation. The high flotation cost is caused by its large dosage and high price. A novel auxiliary collector 4-methodybenzoicacid (4-MBA) was used in combination with benzohydroxamic acid (BHA) to optimize the flotation reagents system for scheelite in the study. A single 4-MBA has weak collection capacity for scheelite. Nevertheless, the combination of 4-MBA and BHA optimized the flotation system of scheelite by ensuring its recovery and reducing the reagent consumption. The results of solution surface tension and contact angle measurements showed that the surface tension of the mixed reagent solution is a relatively lower and the hydrophobicity of the scheelite surface is a relatively higher in the BHA and 4-MBA mixed reagent system. Additionally, a synergistic effect between BHA and 4-MBA on Pb 2+ activated scheelite is revealed by the Zeta potential measurements, infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The addition of 4-MBA promoted the physical and chemical adsorption of BHA. The results of molecular dynamics simulation (MDS) further explained that the collector adsorption layer of the surface of scheelite (1 1 2) is more compact under BHA and 4-MBA mixed reagent system, which prevents the vertical entry of water phase and improves the hydrophobicity of scheelite. Finally, the bench-scale flotation experiment verified that the addition of 4-MBA enhanced scheelite flotation with BHA, and decrease the flotation cost of scheelite.
研究领域:
矿物加工工程
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表面化学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2025
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IF 5.2
Wanting Yang,Zhuoyue Lan,Xiong Li,Yunchuan Li,Hang Li,Yunxiang Du
To efficiently enrich fine copper-molybdenum ore, a pioneering method was employed by utilizing MCO (trimethyl-pyridin) and kerosene as high-efficiency composite collectors in the flotation process. Micro-flotation and actual ore flotation tests demonstrated that the composite collector manifested superior collection capacity and selectivity compared to using a single collector. Furthermore, the inclusion of kerosene reduced collector consumption, thereby lowering overall reagent costs. TOC test results indicated that the composite collector possesses a high adsorption quantity on the mineral surface. Additionally, contact angle measurements demonstrated that the composite collector significantly enhanced the surface hydrophobicity of chalcopyrite and molybdenite. FT-IR, XPS, and ToF-SIMS analyses were conducted to investigate the adsorption mechanism. The results illustrated that MCO adsorbed to mineral surfaces by forming complexes with Cu atoms in chalcopyrite and Mo atoms in molybdenite, respectively. The primary interaction between kerosene and copper-molybdenum ore involved hydrophobic attraction with kerosene physically adhering to the mineral surface to form hydrophobic aggregates. Hence, this study presented an effective procedural approach for the flotation of fine copper-molybdenum ore.
研究领域:
矿物加工工程
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表面化学
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DOI
高影响因子
International Journal of Coal Preparation and Utilization
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2024
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IF 2
Cuiling Ye,Feng Wu,Yijiang Li,Hongxin Qiu,Yanfeng Li
The flotation mechanism of multiple compound collectors called ZKC-I for coal gasification fine slag (CGFS) was revealed from the flotation kinetics, adsorption properties, bubble–particle interaction, and froth properties. The results were compared to dodecane, which represents the conventional nonpolar hydrocarbon oil collector. The flotation concentrates yield and rate constant of CGFS treated by ZKC-I were 2–3 times than those of CGFS treated by dodecane. Fourier transform infrared spectroscopy and wrap angle results showed that ZKC-I improved the hydrophobicity of residual carbon because of the synergistic adsorption of fatty acids, esters, and aromatic hydrocarbons in the ZKC-I on the heterogeneous surface of residual carbon particles, which enhanced the adhesion between residual carbon particles and bubble. Due to the strong carrying capacity of the bubble to residual carbon particles, the number of residual carbon particles in the froth treated by ZKC-I was more than that of the CGFS froth treated by dodecane. The high content of carbon particles in the froth resulted in great stability of the flotation froth, and the maximum height and half-life of the froth were higher than that of CGFS treated by dodecane. This study has practical and theoretical significance for the separation of coal-based solid waste.
研究领域:
矿物加工工程
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环境科学与工程
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DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2020
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IF 1.701
Zhanglei Zhu,Wanzhong Yin,Bin Yang,Haipeng Li,Wanzhong Guo,Jin Yao
In this investigation, the flotation behavior of coking coal using the mixture of oleic acid (OA) and kerosene as a novel collector was further studied through flotation tests, supplemented with optical microscope analysis, X-ray photoelectron spectroscopy (XPS) analysis, and wet-screening analysis. Flotation results showed that both the flotation recovery and rate constant increased with the increasing proportion of OA in the novel collectors. The improved collectivity can be ascribed to the enhanced aggregation tendency between coal particles with the addition of OA. However, the concentrate ash similarly increased as concentrate yield, and the XPS results showed that the novel collector had relative lower selectivity than kerosene. The potential reason to explain the lower selectivity is that OA affected fine high-ash particles greater than that of the coarse particles.
研究领域:
矿物加工工程
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化学工程
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产品关联
DOI
高影响因子
Processes
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2021
·Vol. 9
·期 3
·404
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IF 2.847
Maoyan An,Yinfei Liao,Yijun Cao,Xiaodong Hao,Longfei Ma
The mixed collector can improve low rank coal flotation efficiency, but its synergistic mechanism needs to be further explored. In this paper, oleic acid-dodecane (OA-D), oleic acid (OA), and dodecane (D) were employed to treat the low rank coal for revealing new synergistic mechanism of the mixed collector. First the surface free energy of the coal, the surface free energy of coal-water and coal-water-coal were calculated. Then wetting heat measurement, X-ray Photoelectron Spectroscopy (XPS) and FTIR were used to analyze synergistic mechanism of the mixed collector in depth. The results showed that OA-D obtained a higher combustible recovery than using OA and D, respectively. The essence of synergetic mechanism of OA-D was that they formed a relatively ordered “supramolecular structure” on the low rank coal surface, especially there were hydrophobic and van der Waals forces between the oleic acid chain and the dodecane chain that can promote the formation of a continuous collector film.Keywords:low rank coal;mixed collector;synergetic mechanism;supramolecular structure
研究领域:
矿物加工工程
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表面化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）