SEPARATION SCIENCE AND TECHNOLOGY
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2017
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IF 1.106
Shiwei Wang,Xiuxiang Tao
This study investigated the synergistic effect of viscosity regulators (polyethylene glycol, sodium carboxymethyl cellulose, and polyacrylamide) and frother (2-octanol) on upgrading the flotation performance of low-rank coal. The results of flotation tests were consistent with the analysis of induction time and supported by the results of SEM, viscosity, foaming ability, and foam layer stability. In the present work, it was observed that the highest combustible matter recovery was obtained by mixing the polyethylene glycol (PEG300) with 2-octanol, which increased from 32.9% to about 64.4% accompanied by a little increase of ash content (0.54%). Therefore, it demonstrated that the combination of PEG300 and 2-octanol provided the highest combustible matter recovery and better flotation selectivity.
研究领域:
矿物加工工程
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化学工程
✓ 已验证
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
Jialong Bai,Jieyu Yi,Weiwang Chen,Long Kang,Zhiqiang Zhang
Frothers not only modify gas–liquid interfacial properties, but also alter coal particle surface properties, thereby influencing bubble–coal particle interactions in froth flotation processes. While previous studies have focused on frothers’ effects on gas-liquid interfaces, their impact on coal surface hydrophilicity and coal-bubble interactions remains underexplored. In this study, we measured the bubble–coal interactions using an anthracite coal sample under varying concentrations of MIBC and DF250 frothers during attachment and detachment processes of coal, in combination with surface tension measurement, XPS, FTIR, contact angle measurements, and quantum chemistry calculations. The results demonstrate that both MIBC and DF250 will adsorb on the coal surface and impart hydrophilicity onto it. Increasing frother concentration will render the coal surface more hydrophilic, which will prolong liquid drainage time (t drain ) and enhance the attachment repulsive force (F adr ) during bubble–coal particle attachment. At the same time, this also will decrease the detachment attraction force (F det ) of coal particle. In the examined concentration range, DF250 exhibits more pronounced effects than MIBC, meaning that it is less suitable for coal flotation. For both frothers and in the studied concentration range, F adr consistently exceeds F det , meaning that immediately removal of coal-bubble aggregates from the mixing zone of flotation cell seems to be desirable. In addition, regardless of the presence or absence of frother in water and the structure difference in MIBC and DF250, the contact angle of coal surface should be a good indicator of the strength of coal-bubble interactions.
研究领域:
矿物加工工程
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界面化学
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量子化学
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
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2022
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IF 5.64
Hongzheng Zhu,Yong Zhang,Gaochao Pan,Fan Yang,Jun Chen,Fanfei Min,Jinbo Zhu
The drainage and rupture of solution/frother interface is a prerequisite to predict the adsorption of frother onto the bubble surface. Using a high-speed motion acquisition system, we investigated the dynamic penetration of bubble at the solution/frother interface under four factors that height, capillary inner diameter, ion concentration and ionic valence. Since the kinetic energy of bubble was proportional to the radius and rising velocity, the kinetic energy increased with increasing the height and capillary inner diameter while decreased with increasing the ion concentration and ionic valence. The variation of kinetic energy followed the order: capillary inner diameter > ion concentration > height > ionic valence. The drainage time of the bubble at the solution/frother interface was found to decrease as the kinetic energy increased independently of these factors, indicating that the rupture of the hydration film was significantly influenced by the kinetic energy. A solution column caused by the bubble penetrating the solution/frother interface was observed. The column height increased as the kinetic energy increased for the factors of height and capillary while an opposite trend was presented by the factors of ion concentration and ionic valence. IFT was discussed to be the essential reason for the difference in the penetration. IFT of the solution/air interface increased as the ion concentration increased independently of ion species, and the IFT of different interfaces followed the order: solution/air > frother/air > solution/frother. Our results can provide valuable insight into the development of technology for surfactant adsorption and mineral flotation .
研究领域:
化学工程
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矿物加工工程
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
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2024
·
IF 4.9
Qinglin Yin,Hongji Chen,Shihao Ding,Qi He,Xiahui Gui,Yaowen Xing
Fluidized bed flotation involves three phases of gas, liquid and solid, which can be used for the separation of coarse minerals. In this study, a two-dimensional gas–liquid-solid fluidized bed was developed to explore the fluidization characteristics of fluidized bed flotation. The effects of water velocity, air velocity, frother dosage and particle size (Q l , Q g , ρ n , D p ) on the average pressure drop (–ΔP) and standard deviation (σ ΔP ) were investigated. As the water velocity increases, the pressure drop initially increases, subsequently decreases and eventually remains constant. Increasing the air velocity will enhance the resistance of the bed to the water flow, resulting in a reduction in the water velocity required by peak pressure drop. Furthermore, the pressure drop is observed to decrease due to an increase in air velocity after reaching complete fluidization. Increasing the particle size has the opposite effect, while variations in frother dosage only influence the peak pressure drop. According to the bubble behavior, the influence of different conditions on the pressure drop fluctuation was analyzed. Increasing the water velocity, the frother dosage and the particle size contribute to a reduction in pressure drop fluctuation, whereas an increase in air velocity has the opposite effect. When the water velocity exceeds 1.2 L/min and the frother dosage exceeds 80 g/t, the pressure drop fluctuation is basically unchanged. Finally, the response surface methodology was used to analyze the interaction among the variables, and a mathematical model of the correlation coefficient was established to predict effects.
研究领域:
矿物加工工程
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流体力学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
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2025
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IF 4.3
Xiongwei Liu,Yibo Feng,Xinping Xu,Faqiang Dang,Songyan Li
The crude oil reserves of fractured-vuggy reservoirs are large, but most of them are heavy oil and ultraheavy oil reservoirs. They have the characteristics of high heavy metal ion concentration, high asphaltene content, high viscosity and density, and deep burial. They are difficult to exploit. Therefore, it is necessary to reduce the viscosity of the heavy oil to improve crude oil recovery. In this paper, the use of a viscosity-reducing foamer is investigated. First, the optimal concentration screening, temperature resistance, salt resistance, aging resistance, viscosity-reducing ability, ability to reduce oil–water interfacial tension, and ability to reduce gas–liquid surface tension were evaluated for DXY-03 viscosity-reducing foamer and DXY-08 viscosity-reducing foamer. Then, an oil displacement experiment on the viscosity-reducing foam was carried out under different placement conditions by using a visual fractured-vuggy model. The experimental results showed that the DXY-08 viscosity-reducing foamer has better temperature resistance, salt resistance, viscosity-reducing ability, and ability to reduce gas–liquid interfacial tension than the DXY-03 viscosity-reducing foamer. Therefore, the DXY-08 viscosity-reducing foam was selected for visual oil displacement experiments. The results of the visual oil displacement experiments showed that the DXY-08 viscosity-reducing foamer has good flooding ability, can effectively use the remaining oil in the fractures and holes in the middle of a reservoir, can also block large-opening fractures, and can effectively use the remaining oil in small- and medium-sized fractures. In addition, a liquid phase and a gas phase are produced after the disproportionation of the viscosity-reducing foamer. The liquid phase can emulsify and reduce the viscosity of crude oil, and the gas phase replaces the oil remaining in the fracture hole at the top of the reservoir under the action of gravity, which greatly improves oil recovery.
研究领域:
石油工程
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2022
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IF 10.383
Chuan Zhou,Bo Yuan,Shouxin Zhang,Guang Yang,Lin Lu,Heguo Li,Cheng-an Tao
Zirconium-based metal–organic frameworks (Zr-MOFs) have been considered as prospective materials for the degradation of nerve chemical warfare agents (CWAs) but show poor catalytic performance toward blister agents. Moreover, the powder issues and the poor adsorption capability also remain as the major challenges for the application of Zr-MOFs in practical CWA detoxification. Herein, a series of defected granular UiO-66-NH2 metal–organic gels are synthesized via adjusting the amount of added concentrated hydrochloric acid for the decontamination of 2-chloroethyl ethyl sulfide (2-CEES), a sulfur mustard simulant. The half-life of 2-CEES decontaminated by defected granular UiO-66-NH2 metal–organic gels can be shortened to 7.6 min, which is the highest reported value for MOFs under ambient conditions. The mechanism of decontamination is that the amino group on the linkers in UiO-66-NH2 MOGs undergoes a substitution reaction with 2-CEES to yield 2-(2-(ethylthio)ethylamino)terephthalic acid, which is less toxic and fixed in the frameworks. The recycling test corroborates that the granular UiO-66-NH2 xerogels possess good stability and reusability. Static adsorption and desorption tests show that UiO-66-NH2 xerogels possess a high 2-CEES vapor adsorption capacity of 802 mg/g after exposure for 1 d and only 28 wt % desorption capacity after air exposure for 7 d. The dual function of ultrafast degradation and high adsorption capability provide a firm foundation for using UiO-66-NH2 xerogels as a future protection media.
研究领域:
化学战剂
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材料科学
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环境化学
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催化
✓ 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）