JOURNAL OF MOLECULAR LIQUIDS
·
2025
·
IF 5.2
Wenbao Liu,Ruiqi Ge,Ying Guo,Yu Xia,Sikai Zhao,Wengang Liu,Baoyu Cui,Yanbai Shen
Efficient utilization of low-grade apatite is crucial for securing a stable supply of phosphate fertilizers, making the research and development of high-efficiency collectors essential for its utilization. This study introduces a novel, eco-friendly hydroxyl quaternary ammonium collector, dodecyl dimethyl hydroxyethyl ammonium bromide (DHDB), for the reverse flotation desilication of apatite. The flotation performance and adsorption mechanism of DHDB were systematically investigated through flotation tests, contact angle tests, Fourier transform infrared spectrometer (FTIR) measurements, and molecular dynamics simulations. The flotation results demonstrated that DHDB exhibited excellent selectivity at lower dosages and across a wide pH range, enabling quick and effective separation of quartz from apatite. Mechanism tests and molecular dynamics simulations indicated that the adsorption of DHDB on minerals was primarily driven by electrostatic interactions and hydrogen bonding. The weak electronegativity of the apatite surface and the steric hindrance of the polar groups from DHDB resulted in the poor adsorption of DHDB on the apatite surface. Additionally, the selective separation of quartz from apatite was primarily due to the significantly lower adsorption energy and capacity of DHDB on apatite compared to quartz.
研究领域:
矿物加工工程
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材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2024
·
IF 4.9
Guangsheng Zeng,Wei Weng,Shuiping Zhong,Xiaopeng Chi,Jiaozhong Cai,Wen Tan,Junnan Chen
The novel amidoxime-based collectors, 4-pyridylamidoxime (PA), 3-ethyl-4-pyridylamidoxime (EPA), and 3-methyl-5- tert -butyl-4-pyridylamidoxime (MBPA), were introduced in the lead-free flotation separation of wolframite from quartz and calcite. Compared with PA, EPA, and the traditional collector benzohydroxamic acid (BHA), MBPA exhibited a better separation and recovery capacity to wolframite ore. 4.0 × 10 -4 mol/L MBPA recovered more than 80 % wolframite, ∼24 % calcite, and ∼ 26 % quartz at pH 8.0 without Pb 2+ ions. Under the same conditions, BHA only floated out less than 35 % wolframite. The adsorption amount results exhibited a stronger adsorption ability of MBPA than BHA on wolframite surface. Further, the results of zeta-potential, FTIR, XPS and density functional theory (DFT) calculation revealed that MBPA could chemisorb on wolframite surface to form −N-Fe and −O-Fe bonds. MBPA had stronger electron-donating ability and weaker electron-accepting ability than BHA, which exhibited higher reaction activity. It was clear that MBPA was an excellent collector in the lead-free flotation separation of wolframite from calcite and quartz.
研究领域:
矿物加工工程
·
材料化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yao Yu,Zhifeng Zhang,Yijun Cao,Wei Sun,Zhiyong Gao,Haisheng Han,Pan Chen,Jian Cao
To improve the separation of ilmenite from its associated gangue mineral titanaugite through selective flotation, a novel hydroxamic acid derivative, N-hydroxy-3-(4-methoxyphenyl) acrylamide (HMPA), was successfully synthesized and evaluated as an efficient collector. Comparative flotation tests demonstrated that HMPA outperformed conventional sodium oleate, achieving superior separation efficiency with a TiO 2 concentrate grade of 48.95 % and an impressive recovery rate of 76.0 %. To understand the underlying mechanisms, the interactions between HMPA and the mineral surfaces were investigated meticulously by adsorption capacity tests, contact angle analysis, FTIR, and XPS. The results of contact angle and adsorption measurements intuitively revealed that HMPA exhibited significantly greater adsorption capacity on the ilmenite surface compared to titanaugite. FTIR and XPS analyses indicated that HMPA adsorbed strongly onto the ilmenite surface through chelation with reactive Ti and Fe sites. Density functional theory (DFT) calculations further suggested that HMPA could act as a bidentate ligand, forming a stable five-membered chelate structure through interactions with the Ti and Fe active sites on the ilmenite surface. In conclusion, HMPA demonstrated outstanding collecting ability and selectivity, making it a highly promising collector for ilmenite flotation.
研究领域:
矿物加工工程
·
材料科学与工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Mengyao Qi,Weijun Peng,Wei Wang,Yijun Cao,Guixia Fan,Yukun Huang
A simple and efficient approach of high-speed stirring scrubbing, reverse flotation and direct flotation was adopted to the purification of phosphogypsum (PG), and KH and dodecylamine hydrochloride (DH) were first used as the collectors of reverse and direct flotation, respectively. X-ray diffractometer (XRD), thermal gravimetric analyser (TGA), X-ray photoelectron spectrometry (XPS), and Fourier transform infrared spectroscopy (FT-IR) were used to characterise the samples and analyse the mechanism. KH selectively reactes with organic matter, slime, quartz and pyrite via hydrogen bond and dehydration condensation between the –OH in silanol hydrolyzed by KH and –OH on the surface of quartz and pyrite, and –COOH in the organic matter. Furthermore, the direct flotation collector of DH exhibited superior selectivity of gypsum via electrostatic attraction, and increased the whiteness and purity of the gypsum concentrate to 69.2% and 97.24%, respectively, and the soluble phosphorus and fluorine contents decreased to 0.046% and 0.024%, respectively. The gypsum concentrate reached the first-grade national standard of PG in China (GB/T 23456-2018). Therefore, this study provided a new approach for the purification of PG, which has an important guiding significance for the resource utilisation of PG.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Manman Liu,Luyao Wang,Chen Cheng,Zhaohui Qiu,Sheng Liu,Liu Yang,Guangyi Liu
To achieve an eco-friendly flotation separation of galena from pyrite under the low alkaline and depressant-free conditions, the triazine-dithione surfactants, such as 2-dimethylamino- s -triazine-4-thiol-6(1H)-thione sodium (DMN), 2-diethylamino- s -triazine-4-thiol-6(1H)-thione sodium (DEN) and 2-dibutylamino- s -triazine-4-thiol-6(1H)-thione sodium (DBN) were designed as the special collectors for galena. The micro-flotation results showed that the collecting capacity of these three collectors towards galena was in the order of DBN > DEN ≫ DMN, being consistent with their hydrophobization ability. In-situ AFM observed the aggregation of DBN on the whole surface of galena, which significantly enhanced the contact angle of galena. UV spectra and zeta potential recommended that the affinity of DBN towards lead ions and galena was much stronger than ferrous/ferric ions and pyrite. DFT (density functional theory) calculation revealed DBN’s two exo -S atoms were of its electron-donating center. And XPS confirmed the bonding interaction of the two exo -S atoms with Pb(Ⅱ) atoms on/in galena surface. DBN owned the mild electron-donating capacity and strong electron-accepting ability, and realized the eco-friendly flotation separation of galena from pyrite at pH ∼8.0.
研究领域:
矿物加工工程
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表面化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2024
·
IF 4.9
Wenxuan Huang,Wenbiao Liu,Yongming Zheng,Feng Rao,Lang Yang,Kaixi Jiang
In this study, three separate flotation systems were studied to define the residual collectors found in different recycled water for sulfide (xanthate-chalcopyrite), non-sulfide with anionic (NaOL-dolomite) and cationic (DTAB-quartz) collector processes. The adsorption/desorption of collectors and the adsorption morphology were studied by the zeta potential and atomic force microscopy (AFM) measurements, the adsorption energy and configurations were simulated by the density functional theory-based first principal calculations. It was found that butyl xanthate (BX) was adsorbed on chalcopyrite surface with pronounced protrusions by chemisorption, and the residual BX in slurry was 5.79 %. While sodium oleate (NaOL) formed scattered protrusions on dolomite surface by weak adsorption, the residual NaOL in slurry was 30.74 % that reacted with the Ca 2+ or Mg 2+ cations. The dodecyl trimethyl ammonium bromide (DTAB) adsorbed on quartz surface through hydrophobic aggregations and the residual DTAB in slurry was 16.57 %. This work might provide a guidance for understanding reagent consumption and flotation performance in typical mineral flotation systems.
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
CHROMATOGRAPHIA
·
2021
·Vol. 84
·期 5
·463-471
·
IF 2.044
Huang Xiaofen,Zhang Qin,Li Xianbo,Ao Xianquan,Wang Xuming
Alkyl amines are surfactants used as quartz collectors in the reverse flotation of phosphate ores. It is important in both research and industrial practice to quantify amine concentration in the solution and/or wastewater. A simple and rapid method using high-performance liquid chromatography (HPLC) was developed to quantitatively determine the concentration of amine collectors (including dodecylamine, tetradecylamine, hexadecylamine, and octadecylamine) in a mineral flotation system. The method involved a sample derivatization procedure with 9-fluorenyl methoxycarbonyl chloride (FMOC-Cl) and separation/determination by HPLC coupled with a fluorescence detector. The calibration curves showed good linearity ( R 2 > 0.9956) in the range of 0.20–5.00 µg/mL, and the recoveries of dodecylamine, tetradecylamine, hexadecylamine, and octadecylamine were in the ranges of 84.93–97.64%, 89.93–101.92%, 85.29–98.37%, and 93.57–103.26%, respectively. The method was successfully used to quantify amines in wastewater from flotation experiments and artificial flotation wastewater (amine solution after activated carbon adsorption). The results from the analysis of four amines in the solution demonstrated that the proposed method is suitable for the simultaneous determination of amines in flotation pulp and wastewater.
研究领域:
分析化学
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矿物加工工程
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Rui Han,Shizhi Ruan,Anning Zhou,Zhen Li,Hong Wang,Ningning Zhang
Waste fried oil (WFO) and coal gasification fine slag (CGFS) are both environmentally hazardous wastes, and the flotation separation of resources from CGFS is over-reliant on non-renewable petrochemicals as collectors, it is significant to utilize WFO to prepare renewable collectors for CGFS separation. In this study, six surfactants were selected to be compounded with WFO to prepare renewable collectors, and the flotation effect of the compounded collectors on CGFS and the surfactant-enhanced mechanism for WFO flotation effect were examined through flotation experiments, flotation kinetics experiments, laser particle size analysis, FTIR analysis, XPS analysis, and induction time tests. The results show that WFO alone needs to be used in a large dosage (>30 kg/t) in order to show better flotation performance than diesel, while the flotation performance is greatly improved after compounding with surfactants, among which the best effect is achieved with Span80, and the dosage cut-off point of the compounded collector for flotation better than diesel is reduced to 12.5 kg/t. The surfactant can make the dispersed droplet size of WFO in water decrease from D 50 = 120 μm to 5.63 μm. Meanwhile, the surfactant-assisted WFO can be adsorbed on the residual carbon surface of CGFS through hydrophobic and hydrogen-bonding forces, which can mask the hydrophilic region of the carbon surface and enhance its hydrophobicity. Surfactant-assisted WFO can further shorten the adhesion induction time between CGFS particles and air bubbles, thus facilitating the recovery of more residual carbon in a shorter period of time. The findings can provide theoretical basis and technical support for the resourceful disposal of WFO and CGFS synergistically.
研究领域:
环境科学
·
资源回收
·
化工
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Keyao Li,Junwei Zhou,Sokhibjon Turdalievich Matkarimov,Lingyun Huang,Cheng Liu,Siyuan Yang
The effects of interfacial micro/nano bubbles (IMNBs) in the flotation system seem contradictory due to their dual roles of negative “clean surface reagent” and positive “increase apparent size”. This study generates IMNBs on the mineral surface using the sudden ambient pressure drop method, and investigates the relationship between IMNBs and collector. Microflotation results show that the chalcopyrite flotation recovery was enhanced with IMNBs by the range of 3.42 %∼24.08 % and reached ∼90 % when applying the 81 kPa depressurization amplitude. The magnitude of depressurization positively correlated with these effects, with the order of significance being 81 kPa > 66 kPa > 0 kPa. The collector dosage decreased by 50 % with the optimal flotation condition, confirming the positive results of IMNBs’ application in flotation. Further detection results indicate that a large amount of collector adsorbed onto the IMNBs’ surfaces rather than the chalcopyrite surface after the generation of IMNBs. In addition, IMNBs could promote the agglomeration of fine particles and enhance the adhesion possibility between the fine particles and flotation bubbles. The chemisorption of DDTC onto the chalcopyrite surface in normal conditions and the adsorption remains strong even after the pressure reduction. Thus, the IMNBs still play positive roles in the fine chalcopyrite flotation despite the reduction of collector adsorption amount on the mineral surface. This study is expected to improve the understanding of IMNBs’ effects in the field of mineral flotation.
研究领域:
矿物加工工程
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yangchao Xia,Yaowen Xing,Xiahui Gui,Yijun Cao
Collectors are widely used in flotation to improve the interfacial hydrophobicity of valuable minerals. Clarifying the mechanism of action is therefore a prerequisite for developing new collectors for flotation intensification. In this study, chemical force microscopy was applied to directly characterize the interaction forces between a mineral surface (hydrophobic graphite) and two collector molecules (undecane and polar undecanoic acid). An undecane/undecanoic acid self-assembled monolayer was formed on the Au-coated tip of an atomic force microscopy (AFM) cantilever through chemical deposition. Jump-in phenomena were observed between the collectors and the hydrophobic surface, indicating the existence of an attractive force, which conformed to the EDLVO theories. Various experiments indicated that the interactions between undecane and the hydrophobic surface were stronger than those involving undecanoic acid, indicating that hydrophobic forces dominated the interactions. Using molecular dynamics simulations, the adsorption energies of undecane and undecanoic acid on the graphite surface were determined to be − 17.1 ± 0.3 and − 14.1 ± 0.5 kcal/mol, respectively. The consistency between the force and the adsorption energy results demonstrated that AFM is a credible technique to investigate the interaction mechanism between a mineral and a collector at a molecular level, and so will provide critical guidance for future collector screening and design.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2019
·
IF 3.315
Fei Lyu,Wei Sun,Sultan Ahmed Khoso,Chenyang Zhang,Runqing Liu,Li Wang,Jiande Gao
In this study, propyl gallate (propyl 3,4,5-trihydroxybenzoate; PG) was introduced as a collector for scheelite. The adsorption mechanism on the scheelite surface was investigated by computational and experimental methods, including first principle calculations and Fourier transform infrared (FTIR) spectroscopy. Flotation experiments were conducted to investigate the flotation performance of PG on scheelite. Ethyl p-hydroxybenzoate (EPHB) and ethyl 3,4-dihydroxybenzoate (EDHB), acting separately as collectors for scheelite, were also investigated for comparison. Our results consistently demonstrated that PG chemisorbed onto the scheelite surface by forming a five-member ring through its ortho oxygens. As speculation, the chelating ability of PG was greater than that of EDHB, and EPHB cannot coordinate to Ca(II), which was in excellent agreement with FTIR results. The flotation results showed that PG exhibited an excellent collecting ability for scheelite, followed by the weaker collecting ability of EDHB. EPHB had nearly no ability to collect scheelite, thus confirming the first principle calculation and FTIR analysis. In addition, PG has a stronger ability to collect scheelite than BHA without activation by any metallic ions. Overall, PG is a promising scheelite collector for application and the activate polyphenolic hydroxyl groups offer a new insight for the development of flotation collectors.
研究领域:
矿物加工工程
·
理论化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 5
·1052
·
IF 4.2
Weiwei Wang,Zhengyao Li,Weiyao Zhu,Shaochun Hou,Chunlei Guo
The atomic-level structure and electronic properties of monazite were investigated using a first-principles method based on density functional theory (DFT). First, the geometric structure of monazite was optimized, followed by calculations of its Mulliken population, electron density, and density of states, which were subsequently analyzed. The findings of this analysis suggest that monazite is highly susceptible to cleavage along the {100} plane during crushing and grinding. When SPA was utilized as the collector, the recovery rate of monazite was higher than that when LF-P8 was used. The zeta potential and adsorption energy results indicated that the zeta potential after SPA adsorption tended towards negativity, and the adsorption energy was smaller, indicating that SPA exhibited stronger adsorption performance. LF-P8 was stably adsorbed on the monazite (100) surface via mononuclear double coordination. SPA was stably adsorbed on the surface of monazite (100) via binuclear double coordination. The results of this study provide valuable insights into the adsorption of monazite by commonly used flotation collectors. These findings are of substantial importance for future endeavors in designing flotation collectors capable of achieving selective monazite flotation.
研究领域:
矿物加工工程
·
理论化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）