COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Liang Shen,Zihan Li,Jiabao Gong,Lingyun Liu,Erle Qiao,Yifang Liu,Fanfei Min
Surfactant-enhanced remediation (SER) has emerged as an effective technique for removing polycyclic aromatic hydrocarbons (PAHs) from contaminated soils. This study investigates the SER technique for pyrene removal from kaolinite-containing soil, employing both molecular dynamics simulations and experimental methods. Seven different surfactants were analyzed to evaluate their impact on pyrene desorption from kaolinite surfaces. The results demonstrate that SDBS, SDS, TW80, and TX-100 surfactants induce strong interactions with pyrene molecules, leading to the formation of spheroid self-agglomeration structures. The elution efficiency of pyrene from kaolinite surfaces is influenced by various factors, including surfactant type, dosage, and treatment time. Elution tests reveal that anionic and non-ionic surfactants outperform cationic and amphoteric surfactants as eluents. Additionally, the integration of flotation technology significantly enhances pyrene elution efficiency in the SER process, offering a promising direction for future soil remediation strategies. This research provides fundamental insights into the mechanisms of PAH removal from soil using surfactants and highlights the potential of flotation as a complementary technique. The findings contribute to the development of more efficient and sustainable soil remediation methods.
研究领域:
环境科学
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土壤修复
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Nan Hu,Lin Chen,Yanfei Li,Huizhen Li,Zhijun Zhang,Nana Lei
Heavy metal ions are potent environmental toxins that have accumulated above their natural levels due to human activity. This work investigated the effect of a natural plant protein, perilla seed meal protein (PSMP), on Pb(Ⅱ) removal from its wastewater through a novel flotation technology. This technology consists of the extraction stage, first-stage flotation and second-stage flotation, and a so-called waved internal component (WIC) is designed for the second-stage flotation. PSMP was extracted, enriched and fabricated from low-cost, readily available agricultural waste, namely, perilla seed meal (PSM), during extraction and first-stage flotation. The characterisation and mechanism of interaction between PSMP and Pb(Ⅱ) were examined using SEM-EDS, FTIR, fluorescence spectroscopy and XPS. PSMP bonded strongly to Pb(Ⅱ) via van der Waals interaction, and the primary binding sites were N and O atoms. In the second-stage flotation, PSMP could induce foaming and remove more than 97% of Pb(II) under the suitable conditions of PSMP concentration 500 mg/L, pH 6.0 and airflow rate 250 mL/min. The presence of our waved internal component (WIC) significantly improved drainage and decreased the liquid holdup. This protein obtained from agricultural waste is thus useful as a collector in treating wastewater containing heavy metals.
研究领域:
环境科学
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生物化学
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产品关联
DOI
高影响因子
MINERALS ENGINEERING
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2024
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IF 4.9
Qi He,Chuanfu Chen,Qinglin Yin,Shihao Ding,Yijun Cao,Xiahui Gui,Yaowen Xing
Coarse particle separation is important in mineral processing. In this study, the performance of coarse chalcopyrite ore separation (−600 μm, Cu grade 0.375 %) by fluidized bed flotation (FBF) was investigated and the basic function of fluidized bed on the particle separation is discussed. The chalcopyrite grain size distribution mainly ranges from 50 to 300 μm, with over 80 % of the grains being liberated. The results indicate that the FBF system can reject tailings with a yield of 48 % and a Cu grade of 0.06 %. Additionally, concentrate Cu grade reaches 0.62 %, which is around 1.65 times higher than feed, resulting in a total Cu recovery of 91.55 %. The introduction of a fluidized bed increases Cu recovery of −600 + 300 μm from 50 % to73%, as it improves the possibility of bubble-particle attachment, but the variation of bed height has little influence. Particles with a size of −300 + 74 μm can obtain a 96 % Cu recovery in the bubbly flow, while particles with a size of −74 μm lose their separation effect due to hydraulic entrainment.
研究领域:
矿物加工
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冶金工程
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浮选技术
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Coal Preparation and Utilization
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2025
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IF 2.1
Wenlong Meng,Hanbo Zhang,Yulong Cheng,Xiahui Gui,Yaowen Xing
The surface of low-rank oxidized coal is rich in oxygen-containing functional groups, making it highly hydrophilic and difficult to achieve efficient flotation using traditional oil-based collectors. Aiming to achieve optimal flotation reagent regulation, this study employed Box-Behnken design combined with response surface methodology (RSM) to establish a second-order regression model for combustible recovery in low-rank oxidized coal flotation, systematically investigating the synergistic effects between oxygenated polar collectors and frothers. Flotation experiments were conducted to examine the impacts of three critical parameters: polar/nonpolar component ratio in collector, collector dosage, and frother dosage on combustible recovery. Experimental results demonstrated that under optimal reagent conditions (40.60% polar component in collector, 1500.00 g/t collector dosage, and 602.44 g/t frother dosage), the combustible recovery reached 94.47%, closely matching the model prediction of 95.27%. Mechanistic analysis revealed that polar components in the collector selectively anchored onto oxygen-containing sites on coal surfaces through hydrogen bonding, while nonpolar components formed hydrophobic oil films, synergistically reducing coal-water interfacial energy. The interaction between frother and collector further stabilized bubbles and enhanced particle-bubble adhesion. This study provides theoretical guidance and technical support for the efficient and clean utilization of low-rank oxidized coal.
研究领域:
矿物加工
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煤炭科学
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表面化学
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化学工程
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浮选技术
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
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2025
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IF 4.6
Junchao Wang,Kai Fan,Lijun Deng,Guosheng Li,Yijun Cao
An effective method for enhancing the flotation of cryptocrystalline graphite using positively charged CO 2 nanobubbles (NBs) based on electrostatic driving and NB bridging is proposed, targeting the difficult to float characteristics of cryptocrystalline graphite such as fine particle size, strong electronegativity, and low probability of bubble-particle collision and attachment. The effects of circulation time, gas flow rate and solution pH on the charging properties and size of CO 2 NBs were systematically investigated, and positively charged CO 2 NBs with an average size of approximately 280 nm and a zeta potential of about 13 mV were successfully prepared using a micro-nano bubble generator based on the circulating countercurrent and multiphase vortex gas-liquid shearing technology. Compared with the results of conventional flotation, introducing positively charged CO 2 NBs into the pulp could significantly improve the flotation efficiency of cryptocrystalline graphite. In addition, CO 2 NB flotation could also reduce the amount of kerosene by 58.3 % under the condition of similar separation indicators. The interaction mechanism of positively charged CO 2 NBs enhancing the flotation of cryptocrystalline graphite was elucidated through particle surface electrical properties analysis, flotation kinetics analysis, and particle agglomeration behavior analysis. It was found that positively charged CO 2 NBs mainly promoted particle agglomeration by weakening electrostatic repulsion and strengthening hydrophobic attraction, thereby increasing the apparent particle size and improving the collision efficiency between particles and macro-sized bubbles. Meanwhile, the attachment between particles and macro-sized bubbles was further strengthened based on NB bridging, thus improving the flotation efficiency of cryptocrystalline graphite. This research is of great significance to improve the flotation efficiency of cryptocrystalline graphite and facilitate the application of positively charged micro-nano bubble flotation technology in the field of fine mineral resource separation.
研究领域:
矿物加工
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浮选技术
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纳米气泡应用
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表面化学
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资源工程
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2025
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IF 5.2
Lu Jing,Zhiguo Yu,Lihua Peng,Yongsheng Ji,Deren Yang,Xuegong Yu
Micro and nano bubbles assisted mineral particle flotation can effectively improve the surface hydrophobicity of mineral particles, increase the probability of collision and adhesion between particles and air bubbles. Meanwhile, selecting suitable flotation combination collectors can also enhance the selectivity of mineral particles for further improving the flotation recovery of minerals. In this study, under the presence of micro bubbles, a high quartz flotation recovery of 98.3 % was obtained by a combination collector of DTAC/SDS with the molar ratio of 1: 1 and the dosage of 700 mg/L at pH 9. According to the extended DVLO theory, the relationship between Van der Waals interaction energy ( E v ), hydrophobic interaction energy ( E h ), electric double-layer interaction energy ( E e ) and flotation factors such as the type and concentration of flotation reagents, pH of solution and micro bubble treatment was the deeply investigated. The mechanism of micro bubbles enhancing quartz flotation behavior is regarded as the generated strong capillary bridge attraction between the air bubbles on the surfaces of two hydrophobic particles, which promotes large amounts of fine particles aggregating and forming larger hydrophobic particles. Thereby, the probability of collision and adhesion between bubbles and particles significantly increases and flotation efficiency improves. The experimental results are also evidenced by the calculation of total interaction energy ( E t ) and energy barrier.
研究领域:
矿物加工
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表面化学
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浮选技术
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胶体科学
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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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2025
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IF 5.4
Kang Feng,Jing Cao,Dandan Wu,Jian Liu,Yongxing Zheng,Qi Zuo,Jianan Li
The flotation separation of chalcopyrite and galena presents a significant challenge due to their similar floatability. This research explores the application of 3-mercapto-1-propanesulfonic acid sodium salt (MPS) as a selective depressant for galena to facilitate its separation from chalcopyrite. Micro-flotation assays on individual mineral samples demonstrated that MPS efficiently inhibited galena flotation with negligible impact on chalcopyrite recovery. In the flotation of artificially blended ore samples, under optimized parameters (initial pH of 5.5 and 40 mg/L MPS), a concentrate containing 30.02 % copper (Cu) and 11.05 % lead (Pb) was obtained. The recoveries of Cu and Pb were 92.02 % and 13.86 %, respectively, indicating successful separation. The investigation utilized a suite of surface characterization methods, encompassing atomic force microscopy (AFM), zeta potential measurements, scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM–EDS), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). The findings suggest that MPS exhibited robust adsorption onto the galena surface, potentially via chemisorption, thereby generating a hydrophilic layer that impeded collector adsorption. However, MPS exhibited weak adsorption on chalcopyrite, maintaining its floatability. Density functional theory (DFT) calculations supported these findings. The findings demonstrated the thiol S of MPS undergoes chemisorption onto the galena surface via S–Pb bonding with surface lead atoms. This study provides a novel small-molecule depressant with high selectivity for the flotation separation of chalcopyrite and galena.
研究领域:
矿物加工
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表面化学
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浮选技术
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材料科学
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矿业工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Xu Wang,Shuming Wen,Songlin Chen,Lifang He,Guang Han,Qicheng Feng
Conventional collectors based on xanthate utilized in the flotation process for separating Cu–Fe sulfide minerals are hindered by issues such as low selectivity, the need for large dosages, and environmental implications. This study investigated the synergistic adsorption behavior of a binary collector system composed of sodium dibutyldithiocarbamate (SD) and ammonium dibutyldithiophosphate (ADD) on chalcopyrite surfaces. Micro-flotation tests indicated that the SD/ADD mixture significantly improved flotation performance compared to the individual collectors. With a total concentration of the collector at 5 × 10⁻ 5 mol/L and a molar ratio of ADD to SD set at 2: 3, chalcopyrite recovery reached 94.64 %, with an increase of approximately 33 % over that achieved with a single collector. Surface characterization results confirmed that SD and ADD co-adsorb onto chalcopyrite through both physical and chemical interactions, forming a hydrophobic surface layer. In contrast, under lime-treated suppression conditions, the adsorption of the mixed collectors on pyrite was effectively inhibited. Molecular dynamics simulations further revealed that SD and ADD co-adsorb onto the (112) crystal plane of chalcopyrite. These findings confirm the combined influence of SD and ADD in improving the flotation efficiency of chalcopyrite and present a potential reagent system for the flotation separation of Cu–Fe sulfide minerals.
研究领域:
矿物加工
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表面化学
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浮选技术
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Heng Yu,Wei Sun,Chenyang Zhang,Zechao Huangfu,Fuchao Fan
In the field of mineral processing, the flotation separation of talc and molybdenite has long faced severe challenges, and the development of efficient flotation depressants is a crucial research direction to address this issue. Due to the complex pulp environment, the selective depression effect of a single flotation depressant is relatively poor and significantly influenced by pH levels. In contrast, combined depressants offer advantages such as synergistic depression mechanisms, multi-target action, and less sensitivity to pulp environment, making them the core technical for the flotation separation of talc and molybdenite. This study innovatively employs sodium carboxymethyl starch (CMS) and Aluminum chloride (AlCl₃) as combined depressants for the separation of talc and molybdenite and systematically compares the differences in adsorption behavior and mechanisms on different crystal surfaces of talc and molybdenite using various characterisation methods in conjunction with micro-flotation experiments. The results indicate that the unique structures and wettability differences of the various crystal surfaces of talc and molybdenite are the direct reasons affecting the depression effectiveness of the combined depressants. Further research shows that CMS and AlCl₃ first form a complex, which then adsorbs onto the surface of talc, with the combined adsorbent exhibiting stronger adsorption on the talc (100) surface than on the (001) surface. Flotation results indicate that when the concentration of CMS is 0.25 × 10⁻³ mol/L, the recovery rate of molybdenite reaches its highest at 92.51 %; conversely, when the concentration of CMS is 1.25 × 10⁻³ mol/L, the recovery rate of talc drops to its lowest at 13.01 %. This research offers a new technological avenue for the efficient selective separation of talc-containing molybdenite systems, showcasing significant industrial application value.
研究领域:
矿物加工
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浮选技术
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表面化学
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吸附机理
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络合化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2025
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IF 6.9
Shengzong Lan,Liuyang Dong,Peilun Shen,Tianfu Zhang,Dianwen Liu,Zhengchang Shen
Apatite and calcite coexist in phosphate ore, resulting in a relatively low grade of phosphate ore and increasing the difficulty of phosphorus chemical production. Malic acid is considered to have potential as a flotation depressant due to its structural characteristics. The effects of malic acid on the flotation separation between apatite and calcite, as well as the differences in surface regulation, were systematically investigated through flotation experiments, zeta potential measurements, contact angle analysis, atomic force microscopy, X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) calculations. With a malic acid concentration of 1 × 10 −3 mol/L, the recovery of apatite decreased to 10.16 %, while the recovery of calcite remained stable at 87.59 %. The influence of interfering ions was eliminated by adding Na 2 SO 4 , and the separation performance of malic acid was verified using artificial mixed ores. Surface property characterization and morphology analysis indicated that malic acid adsorbed in a densely punctate manner on the apatite surface. The high adsorption density and strength hindered collector attachment to the apatite surface. However, the adsorption on the calcite surface was sparse and had minimal impact on its floatability. XPS results showed that malic acid adsorbed at the Ca 2+ ion sites of the minerals and interacted more strongly with apatite. DFT calculations demonstrated that the adsorption of malic acid on the apatite surface was more pronounced, and the presence of H atoms within malic acid molecules, together with solvent water molecules, further enhanced the adsorption reaction. This study provides a theoretical basis for the application of malic acid as a flotation depressant and offers new ideas for the efficient flotation separation of phosphate ore.
研究领域:
矿物加工
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浮选技术
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表面化学
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环境科学
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量子化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Xueming Yin,Jin Yao,Bin Yang,Wanzhong Yin,Wenbo Li,Jiayi Liu
Actinolite is often associated with hematite and tends to form fine-grained particles during grinding, which makes the recovery and separation of hematite through flotation challenging. This study innovatively used polyethylene oxide (PEO) as a flocculant and, in a reverse flotation system with dodecylamine (DDA) as the collector, increased the recovery rate of actinolite by 40.59 %, the desilication rate of the binary artificial mixed ore by 25.23 %, and that of the ternary artificial mixed ore by 4.62 %. The study also investigated the effect of PEO on the structure of actinolite during flocculation and the relationship between the structure of actinolite flocs and their floatability. Laser particle size and turbidity tests indicated that PEO significantly increased the particle size of fine actinolite, causing it to aggregate into flocs while reducing its settling velocity and apparent density. Optical microscopy and scanning electron microscopy observations revealed that the low density of the flocs was due to PEO flocculating fine actinolite into porous and irregular spherical shapes with high surface roughness and specific surface area. Energy dispersive spectroscopy analysis and wrapping angle analysis demonstrated that the flocs have a large specific surface area, apparent volume, and are subject to greater buoyancy, making them more likely to attach onto the surface of bubbles and be carried by them. Therefore, PEO can be used as a flocculant for the flotation of actinolite, increasing the floatability of fine-grained actinolite and thereby enhancing the flotation removal rate of actinolite in hematite. The mechanism of fine-grained actinolite flocculation enhancing reverse flotation desilication of hematite.
研究领域:
矿物加工
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浮选技术
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表面化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Yuanlin Chen,Yanfei Chen,Leilei Li,Jianhua Chen
During the flotation of sulfide minerals in the presence of serpentine, fine serpentine particles tend to coat the surfaces of sulfide minerals, severely deteriorating their flotation performance. To address this issue, sodium phosphate was used as a surface modifier for serpentine in this study to eliminate its detrimental effect on the flotation of sulfide minerals. Micro-flotation results indicated that under flotation conditions with pH = 8, the presence of natural serpentine in the slurry significantly reduced the recovery of pyrite. However, surface modification of serpentine with phosphate effectively eliminated its adverse effect, allowing the pyrite recovery in the mixed mineral system to nearly return to the level observed for pure pyrite. The underlying mechanism of this modification effect was elucidated through theoretical simulations and characterization techniques, revealing that phosphate readily interacted with surface-exposed Mg 2+ sites on serpentine, leading to a change of the surface charge from positive to negative. As a result, the serpentine and pyrite particles in the mixed slurry acquired similar surface charges, promoting a well-dispersed system and significantly enhancing the pyrite flotation recovery. This study highlights the potential use of phosphate for reducing the magnesium content in sulfide concentrates and provides a feasible strategy for the flotation separation of sulfide minerals from serpentine.
研究领域:
矿物加工
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表面化学
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浮选技术
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提取冶金
✓ 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）