FUEL
·
2018
·
IF 4.908
Liang Shen,Fanfei Min,Lingyun Liu,Jinbo Zhu,Changguo Xue,Chuanchuan Cai,Wei Zhou,Chao Wang
Fossil fuel depletion, environmental concerns, and steep hikes in the price of fossil fuels make it imperative to develop alternative and renewable products to decrease oil products consumption in coal flotation process. Pyrolysis product of the waste cooking oil was proposed as a potential coal flotation collector in this paper. The gas chromatograph-mass spectrometer test and thermogravimetric method were used to study the properties of the waste cooking oil. The pyrolysis product of the waste cooking oil was used as coal flotation collector in two different ways. Thermogravimetric analysis showed that the pyrolysis of the waste cooking oil sample was mainly divided into three processes. The waste cooking oil pyrolysis product possessed strong collecting ability and better selectivity, and can replace diesel as a coal flotation collector. 79% combustible matter recovery was obtained in the presence of 1 kg/Mg DW-450 °C dosage compared with that of 68% in the presence of diesel. Better flotation results can be obtained in the presence of gaseous pyrolysis products of the waste cooking oil. With the increase of pyrolysis temperature of the waste cooking oil, the combustible matter recovery of the concentrate is increasing, while the ash content of the concentrate is showing a decreasing trend.
研究领域:
能源与燃料
·
环境科学
·
矿物加工工程
✓ 已验证
DOI
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2017
·
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
·
化学工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
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
·
界面化学
·
量子化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2025
·
IF 2.3
Yaxin Ren,Zhijun Zhang
An effective collector is crucial for enhancing coal flotation efficiency. The effect of a mixed collector based on petrochemical by-products on coal flotation was investigated. The investigation included various addition orders and was conducted using flotation tests, particle size distribution analysis, GC-MS, FTIR and contact angle measurements. The Mixed addition order exhibited superior performance in flotation compared to the K+Y and Y+K orders at all tested dosages. Particle size distribution analyses revealed that the mixed collector offered better dispersion in water than individual the Y-oil and K-oil, with droplet sizes below 100 µm. FTIR and contact angle measurements indicated that coal treated with the Mixed addition order demonstrated optimal reagent adsorption and the highest level of surface hydrophobicity. Aromatic compounds in the collector interacted with the hydrophobic areas of the coal surface, while partially covering some of the hydrophilic regions between these hydrophobic sites. Conversely, heteropolar components engaged with the hydrophilic regions on the coal surface to enhance adsorption. Despite these improvements, some hydrophilic sites remained after treatments with the Y+K and K+Y orders, which continued to affect the coal flotation properties.
研究领域:
矿物加工工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Minerals
·
2023
·Vol. 13
·期 4
·524
·
IF 2.5
Junling Liu,Xicheng Bao,Yesheng Hao,Jincheng Liu,Yulong Cheng,Rui Zhang,Yaowen Xing,Xiahui Gui,Jihui Li,Budeebazar Avid
The compound collector, composed of polar and nonpolar parts, is a current research hotspot in low-rank coal (LRC) flotation because of its outstanding flotation efficiency and cost-effectiveness. However, the selection of compound proportions lacks theoretical guidance. In this study, we comprehensively investigate the internal mechanism underlying the influence of the compound proportion (oleic acid (OA):dodecane (DD)) on LRC flotation. The molecular dynamics (MD) simulation between bubble and oil film was simultaneously employed to study the surface interactions between three phases in contact. The compound proportion of OA:DD = 1:3 was found to be the most conductive for Zhuanlongwan coal flotation, which provides a robust collecting capacity while minimizing excessive interaction with water. Thus, the spreading area is the largest and the interaction energy between collectors and LRC is the highest. Additionally, the oil film formed at this ratio has the best hydrophobicity, resulting in the fastest adhesion speed of the bubble and the most stable bubble adhesion. Proportions of OA:DD above 1:3 promote self-aggregation of polar collectors, leading to a worsened spreading of the oil film. Conversely, proportions below 1:3 result in weak interaction with LRC, leading to a smaller spreading area and reduced hydrophobicity. Ultimately, we propose the LRC–compound collector matching principle, which suggests that the best proportion of compound collectors fits well with the oxygen-containing sites on the LRC surface.Keywords:low-rank coal flotation;compound collector;optimal proportion;MD simulation
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
Mining Metallurgy & Exploration
·
2024
·Vol. 41
·期 1
·363-378
·
IF 1.5
Kong Rongjie,Wang Shiwei,Gui Dongjiao
Metal cations have significant effects on the flotation of coal and minerals. In this study, the effects of monovalent cations (Na + and K + ) on the flotation of low-rank coal (LRC) were investigated using flotation and particle–bubble attachment experiments and through X-ray photoelectron spectroscopy (XPS) and molecular dynamics simulations. Oleic acid (OA), methyl linoleate (ML), hexadecyltrimethylammonium chloride (CTAC), ricinoleic acid (RA), and kerosene were used as flotation collectors. The flotation experiments revealed that the flotation yields of LRC improved when OA, ML, RA, CTAC, and kerosene were used in pure deionized water. However, flotation was suppressed for these collectors in the presence of K + and Na + ions. In contrast, when using CTAC, the flotation yield increased in the presence of these ions. Specifically, the flotation yield increased from 41.24 to 87.03% when 2.0 kg/t CTAC was used in 10 mmol/L NaCl solution. Particle–bubble adhesion experiments and XPS revealed that the hydrophilic groups of CTAC were adsorbed on the LRC surfaces by electrostatic forces, whereas the oxygen-containing functional groups of OA, ML, and RA formed hydrogen bonds with the LRC surface in pure water. Finally, the simulating result revealed that the hydrophobic ends of the OA, ML, and RA collectors hinder the flotation of LRC by adsorbing monovalent cations, whereas the adsorption of monovalent cations on the hydrophobic end of the cationic surfactant (CTAC) promotes flotation via strong electrostatic interactions.
研究领域:
矿物加工工程
·
物理化学
·
材料科学与工程
✓ 已验证
DOI
高影响因子
International Journal of Mining Science and Technology
·
2023
·
IF 11.8
Fan Lian,Guosheng Li,Yijun Cao,Baoxun Zhao,Guangli Zhu,Kai Fan
As the poor dispersion of oily collectors and the inferior hydrophobicity of the mineral surface, the low-rank coal has an unsatisfactory flotation performance when using traditional collectors. In this paper, an ionic liquid microemulsion was used as a collector to enhance its floatability. Flotation test results demonstrated the microemulsion collector exhibited a superior collecting ability. A satisfactory separation performance of 78.66% combustible material recovery was obtained with the microemulsion collector consumption of 6 kg/t, which was equivalent to the flotation performance of diesel at a dosage of 25 kg/t. The dispersion behavior of the microemulsion collector was investigated using the Cryogenic-Transmission Electron Microscopy. The interaction mechanism of the microemulsion collector on enhancing the low-rank coal flotation was elucidated through the Zeta potential and contact angle measurements, the Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analysis. The microemulsion collector exhibited superior dispersibility, which was dispersed into positively charged oil droplets with an average size of 160.21 nm in the pulp. Furthermore, the nano-oil droplets could be more efficiently adsorbed on the low-rank coal surface through electrostatic attraction, resulting in the improvement of its hydrophobicity. Thus, the microemulsion collector shows great application potential in improving the flotation performance of low-rank coal.
研究领域:
矿物加工工程
·
界面化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2023
·
IF 4.1
Xicheng Bao,Junling Liu,Shasha Wang,Dongqin Chen,Wenjin Xu,Deke Zhang,Jihui Li,Yaowen Xing,Mengdi Xu
Efficient flotation of low-rank coal is of great significance for the development of green and low-carbon cycles. Temperature is a crucial parameter of flotation, but the mechanism of its effect on flotation lacks understanding. In this paper, the mechanism was studied by kinetic flotation, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy, low-temperature liquid-nitrogen adsorption (LP-N2A), X-ray photoelectron spectroscopy (XPS), and molecular dynamics simulation. The flotation combustible recovery gradually decreases as temperature rises. Compared with 60 °C, the combustible recovery at 5 °C increases by 18.13%. The desorption energy for oil droplets decreases as the temperature rises. As a result, the oil droplets are easier to desorb at high temperatures. The SEM and LP-N2A results demonstrate that the pores and fractures of the coal sample are well developed. Also, the oil–water interfacial tension and viscosity of oil droplets decrease as the temperature rises, while the diffusion ability increases. These increase the volume of oil droplets that penetrate into the pores, resulting in poor spreadability of oil droplets on the coal surface. The average volume of bubbles gradually increases as temperature rises, which renders the flotation foam unstable and worsens the flotation. Therefore, the flotation performance is better at low temperatures.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Minerals
·
2021
·Vol. 11
·期 11
·1271
·
IF 2.644
Qingshan Zhang,Chenkai Niu,Xiangning Bu,Muhammad Bilal,Chao Ni,Yaoli Peng
Conventional hydrocarbon oil cannot adhere effectively to oxidized coal, resulting in a low yield of clean coal. In this study, a high-speed homogenizer was used to emulsify LDD (laurylamine dipropylene diamine) and kerosene, which enhanced the flotation efficiency of oxidized coal. The flotation results showed an increase from 4.12% (only kerosene) to 23.33% (emulsified oil). An increase in contact angle indicated that the mixture reagent can increase the hydrophobicity of coal particles, which is attributed to the adsorption of LDD onto the coal particle surface and the decrease of the oil droplet A lower surface tension of LDD allows it to produce a stable layer of froth than the layer generated by kerosene alone.Keywords:flotation of oxidized coal;laurylamine dipropylene diamine;emulsified kerosene;froth stability;coal hydrophobicity
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
FUEL
·
2021
·
IF 6.609
Zhe Yang,Yinfei Liao,Maoyan An,Hourui Ren,Xiaodong Hao,Xingwei Song,Zechen Liu
Waste motor oil/lubricating oil (WMO) is a hazardous and important resource. The waste siloxane-based motor oil/lubricating oil (WSMO) has a special composition based on siloxane. The WSMO has a large and increasing production worldwide. In this paper, the feasibility of WSMO as a collector for low-rank coal (LRC) flotation was discussed with a comparison to diesel oil (DO). The gas chromatography-mass spectrometry (GC/MS) and thermal gravimetric analysis (TGA) were used to analyze the chemical composition of WSMO. The flotation experiment was conducted to investigate the collectivity and selectivity of WSMO as an LRC collector. The interaction between WSMO and LRC was systematically analyzed using X-ray photoelectron spectroscopy (XPS), contact angle, zeta potential, and induction time measurements. The results indicated that WSMO majorly contained dimethylsiloxane and cyclodimethysiloxane with various chain lengths. High concentrates yield and low ash content was obtained in the flotation using WSMO. The adsorption of WSMO can mask the oxygen-containing groups (OCGs) on the LRC surface, leading to an increase of C content and a decrease in O content. This was beneficial to improve the hydrophobicity of the LRC surface so that the water-coal contact angle increased from 35.6° to 57.85° after WSMO treatment. Moreover, a significant increase in zeta potential was observed in the pH range of 4 to 10. LRC particles pretreated with WSMO were more easily adhere to the bubble surface in a short induction time of 40 ms. It was demonstrated that WSMO was an effective collector to promote LRC flotation.
研究领域:
矿物加工工程
·
环境科学与工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Shiwei Wang,Songjiang Chen,Chengyong Wang,Yongzhong Hu
This study quantitatively demonstrated the flotation enhancement of coarse low-rank coal using innovative oily bubble technology, combining experimental characterization with advanced theoretical modeling. Systematic X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy revealed that the coal surface contains 53.43 % oxygen-containing functional groups and 38.14 % hydroxyl groups, which traditionally hinder flotation efficiency. The novel application of oily bubbles, generated through hydrodynamic cavitation, remarkably improved coarse particle (1.00–0.75 mm) recovery, achieving up to 78.94 % yield compared to 73.28 % with conventional flotation. The extended DLVO theory revealed a fundamental mechanistic shift: while air bubbles exhibited repulsive energy barriers (critical thickness = 21.02 nm), oily bubbles created attractive interactions with a negative total energy barrier owing to their minimal polar component (46.88 % vs. 0.82 %, respectively). Complementary Stefan–Reynolds modeling showed that oily bubbles accelerated wetting film drainage by 3.6 times, with hydrophobic force constants markedly surpassing those of air bubble systems. These findings provide new insights into interfacial science and address a persistent industry challenge—the inefficient recovery of coarse low-rank coal particles. Future studies will focus on scaling up the oily bubble generation system for industrial deployment.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yingdi Dong,Lingyu Rao,Yong Zeng,Tao Peng,Jiahao Huang,Yanxiu Wang,Yuping Fan,Zhiyong Gao,Honghu Tang,Wei Sun
The solid–liquid separation of coal tailings is crucial for enhancing coal resource utilization and water circulation. With the mining and processing of low-quality coal, the coal flotation tailings (CFT), characterized by fine particle size, variable mineral composition and complex particle surface properties, presented significant challenges to efficient solid–liquid separation. This study synthesized a series of polycarboxylate ether (PCE) reagents with tunable structure to optimize solid–liquid separation performance and investigate their interaction mechanisms with CFT. The results showed that increasing the carboxyl acid ratio in PCE significantly improved settling and filtration performance. Increasing the carboxyl acid ratio in PCE from 2:1 to 6:1 improved settling rate by 6.5 times and sediment solid content by 9.13 wt%, while reducing specific filtration resistance by 42.86% and filter cake moisture by 3.14%. Analysis of particle surface electrical property and wettability indicated that an increase in the carboxyl acid ratio in PCE enhanced its ability to neutralize the negative charges on the particle surface and its hydrophobic ability. The growth behavior and properties of flocs were investigated by means of focused beam reflectance measurement microscopic observation and fractal dimension analysis. The results showed that an increase in carboxyl acid ratio in PCE promoted floc growth, regrowth, and shear resistance. The floc size increased by 10.48%, and the fractal dimension increased from 1.532 to 1.636, resulting in the formation of flocs with a denser structure. These improvements in floc properties were closely related to the enhancement of CFT settling and dewatering performance. This study provided new insights into the mechanisms of PCE in enhancing solid–liquid separation of coal tailings and highlighted its potential for treating complex tailings.
研究领域:
化学工程
·
矿物加工
·
环境科学
·
材料科学
✓ 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）