Minerals
·
2021
·Vol. 11
·期 1
·58
·
IF 2.644
Yinfei Liao,Xingwei Song,Maoyan An,Zhe Yang,Xiaodong Hao,Hourui Ren
The wetting film evolution process is essential for flotation, especially in bubble–particle attachment. A mixed collector has been proved effective in promoting flotation. In this paper, the effect of a mixed collector (MC) composed by n-dodecane (D) and oleic acid (OA) on wetting film evolution was investigated using the extended Derjagin–Landau–Verwey–Overbeek (EDLVO) theory, the Stefan–Reynolds model, induction time, and zeta potential measurement. The hydrophobic force constant between bubble and coal treated by different collectors was analyzed. The results showed that MC was superior in reducing the induction time and increasing the zeta potential. When bubbles interacted with coal treated by MC, they had relatively low interaction energy, high critical film thickness, and high drainage rate. The order of hydrophobic force constant was no reagent < D < OA < MC. It indicated that the hydrophobic interaction between bubbles and coal particles treated by MC was the strongest because of the synergistic effect of D and OA.Keywords:wetting film;EDLVO theory;Stefan–Reynolds model;collector;hydrophobic force constant
研究领域:
矿物加工工程
·
界面化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Houchun Yan,Yujie Zhen,Anle Zhang,Tao Li,Wenxue Lu,Qingsong Li
To separate higher-rank phenols from coal tar model compound, the quantum chemistry calculation, solvent power, and selectivity analysis evaluated the separation efficiency of polyols as solvents, and the liquid–liquid equilibrium data of toluene + {4-ethylphenol, 2-allylphenol, guaiacol, or 2-isopropylphenol} + ethylene glycol were measured in 303.2 K and 101.3 kPa. The distribution coefficient and separation factor were calculated to compare the efficiency of extracting different phenols using ethylene glycol. The molecular dynamics (MD) method investigated the mechanism of extraction of phenols by ethylene glycol, and the results are consistent with the experimental results, indicating that ethylene glycol can be used as an extractant for the extraction of higher-rank phenols from coal tar, and the extraction effect in the 4-ethylphenol-toluene system is the best. The non-bonded interaction energy, radial distribution function, and self-diffusion coefficient were discussed, which shows that the interaction force between phenols and ethylene glycol is mainly provided by electrostatic force.
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
ENERGY
·
2022
·
IF 8.857
Wei Lu,Ao Gao,Weili Sun,Yuntao Liang,Zhenglong He,Jinliang Li,Yong Sun,Shuanglin Song,Shaocong Meng,Yingjiazi Cao
A kind of simple and efficient m-Cresol water-based inhibitor was proposed. The inhibitory effects of its solutions on the spontaneous combustion of different-rank coals were discussed. Furthermore, the micromorphology and wetting characteristics of different-rank coals were analyzed through a scanning electron microscope and a contact angle meter, respectively. Besides, the weight loss rates, oxidation characteristics, pore structure characteristics and free radical changes of different coal samples were investigated by a thermogravimetric analyzer, temperature-programmed experiments, a surface area analyzer and an electron spin resonance spectrometer, respectively. The results indicate that the prepared inhibitor solution at the 0.3 wt% sodium dodecyl sulfate (SDS) not only boasts good emulsification and wetting performance, but also plays a role in permeability enhancement. The m-Cresol/SDS solution can wet the coal surface and permeate the inner pore surface, forming a uniform inhibitor layer on both the coal surface and the inner pore surface to isolate oxygen, retain water and inhibit free radical generation. Moreover, it can not only effectively reduce the weight loss rate, CO production, specific surface areas and free radical concentration in the oxidation process of Coal XLH , Coal BLT and Coal YQ , but also improve the inhibition rate (to 79.1%, 67.4% and 54.3% at 170 °C respectively).
研究领域:
矿业工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Jun Zhao,Hong Liu,Haochen Zhang,Xiaolin Song,Haibin Zuo,Guangwei Wang,Zhigao Xu,Ming Wu,Zhenyue Zhang,Ru'an Chi
This study aimed to effectively utilize low-rank coal and biomass residue in the coking process. Hypercoal was produced through co-thermal extraction, and its performance as a component in the coking process was investigated. The effects of the amount of hypercoal extracted from 80 wt% low-rank coal and 20 wt% biomass residue on the coke strength and structure were investigated. Raman spectroscopy, optical microscopy, and scanning electron microscopy were used to analyze the carbonaceous, optical, and pore structures of the hypercoal coke. The optimal ratio of the coal blend contained 15 wt% hypercoal, with compressive and drum strengths of 7.76 MPa and 86 %, respectively. The vitrinite content and average maximum vitrinite reflectance of the hypercoal were 95 % and 0.352, respectively. High vitrinite contents in hypercoal contribute to the formation of mosaics within the coke, which can improve its cold strength. Moreover, the evolution of the hypercoal coke structure at various addition ratios was explored.
研究领域:
冶金学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2026
·
IF 5.2
Zhongyan Bao,Juan Du,Yu Gao,Sinian Liu,Nanhai Xiao,Hang Wang,Luoyuan Zhao,Ming Chen,Fengqin Feng,Wei Qu,Qianqian Wang
This study was designed to comprehensively analyze the benefit effect and underlying mechanism of egg yolk-derived peptide VPF (Val-Pro-Phe) in bone development by integrating network pharmacology, molecular docking/dynamics simulation, and zebrafish in vivo experiments. Results demonstrated that VPF exhibited dose-dependent intervention effects within the concentration range of 0.2–10 μg/mL in normal and bone dysplasia zebrafish. Specifically, 0.2 μg/mL of VPF exhibited significant enhancements in total length (TL), mineralization, and swimming distance by 4.01%, 14.00% (P < 0.05), and 7.31% in normal zebrafish model, whereas 1 μg/mL of VPF led to significant increases in the aforementioned indexes by 6.30%, 45.26%, and 51.05% (P < 0.05) in bone dysplasia zebrafish model. Then, network pharmacology revealed that the highest correlation between VPF in improving bone development and osteoclast differentiation pathway, with osteoprotegerin (OPG) being the core node in this pathway. Molecular docking results showed that VPF exhibited the highest binding affinity for OPG, and this interaction was further validated by 200 ns molecular dynamics simulations, which demonstrated the stability of the VPF-OPG complex. Furthermore, VPF upregulated the gene expression of OPG, and downregulated the gene expression of the receptor activator of the NF-κB ligand (RANKL) and TNF receptor-associated factor 6 Gene (TRAF6), and downregulated the RANKL/OPG ratio in zebrafish. These data indicate that VPF alleviates skeletal dysplasia primarily by OPG-mediated suppression of osteoclast differentiation within the OPG/RANKL/RANK axis, thereby supporting its potential value as a functional food ingredient for promoting bone development.
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2020
·
IF 4.748
Mei Zhong,Da Zou,Yuebing Xu,Lijun Jin,Yue Pan
Acid treated kaolinites (KA) were successively loaded with Zr and Fe, Ni or Co component to control the product distribution and upgrade the tar quality in coal pyrolysis . The structure of the resultant catalysts was characterized and their catalytic performance in the pyrolysis of demineralized low-rank coal and benzyl phenyl ether (BPE), a model compound containing C al -O bridge bond, were investigated. Results show that the introducing of Zr into the KA can enlarge the hysteresis loop due to the stacking of ZrO 2 particles. The acidities, especially the strong ones, increase as the Zr content is below 8 wt% (KA-8Z). When adding Fe, Ni or Co metals into the KA-8Z, the number of Brønsted acid sites obviously decreases, but Lewis acid sites increase. The maximum BPE conversion of 94.0% occurs for the KA-8Z, further metal-loaded sample promotes the cleavage of C al -O bond in BPE and the formation of active H radicals from CH 3 OH, leading to the increase of BPE conversion. Besides, remarkable enhancement of target monomeric aromatics is observed for the Fe, Ni and Co-loaded samples. Compared with the pyrolysis without catalyst, the tar yield as well as pitch content decrease over the KA-8Z and its metal-modified catalysts. Wherein, Ni-KA-8Z has the highest activity for tar upgrading, leading to the largest increase in the contents of light oil and phenol oil. In-situ pyrolysis by time-of-flight mass spectrometry reveals the enhanced dissociation of weak covalent bonds linked in the coal skeleton over the KA-8Z and Fe, Ni and Co-modified catalysts, resulting in a decrease in the peak temperature for product release. A marked increase in phenols and diphenols confirms a promoted dissociation of ether bond in coal.
研究领域:
化学工程
·
能源科学
✓ 已验证
DOI
高影响因子
Processes
·
2021
·Vol. 9
·期 3
·404
·
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
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Yinfei Liao,Hourui Ren,Maoyan An,Yijun Cao,Zhe Yang,Xiaodong Hao,Xingwei Song
It is well known that mixed collectors can effectively strengthen the flotation of low-rank coal. However, less concern has been paid to the detachment of low-rank coal flotation using mixed collectors. In this study, the force of air bubble detachment from low-rank coal surface treated by oleic acid (OA), dodecane (D), and oleic acid–dodecane (OA–D) collector mixture was investigated using microforce balance. The results showed that the process of bubble detachment from the low-rank coal surface was divided into three stages: relaxation stage, stretching stage, and sliding stage. The equilibrium contact angle and critical contact angle were the transition points between different stages. The order of detachment force required for bubble detachment from the surface of low-rank coal was OA–D > OA > D, indicating a synergistic effect between OA and D. Based on the three parameters of equilibrium contact angle, critical contact angle, and contact line length, a theoretical model was proposed to calculate the detachment force. The calculated results were in agreement with the measured results.
研究领域:
矿物加工工程
·
界面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY
·
2022
·
IF 8.857
Jun Zhao,Hassan Nasir Mangi,Zhenyue Zhang,Ru'an Chi,Haochen Zhang,Mengyu Xian,Hong Liu,Haibin Zuo,Guangwei Wang,Zhigao Xu,Ming Wu
This study aimed to effectively utilize low-rank coal and biomass residue in the coking process . The gasification performance of cokes prepared from the modified coal was investigated, meanwhile the structural characteristics of different cokes were analyzed by Raman spectroscopy, X-ray diffraction and infrared spectroscopy. The results showed that solvent thermal extraction process could dramatically remove the ash content and gradually enhance the caking performance and carbon content for low-rank coal. The ash content, carbon content, penetration distance, and caking index of modified coal were 0.86 wt%, 78.18 wt%, 35.48 mm, and 95%, respectively. Structural analysis results showed that the order degree and graphitization degree of BIOC-HPC coke were superior to those of coking coal coke, and the overall compactness of BIOC-HPC coke was improved. Compared with the coking coal coke, the gasification performance of coke could be improved by adding modified coal; the optimal addition ratio of the modified coal in coal blending for coking was between 10 wt% to 15 wt%. The gasification kinetic analysis indicated that the RPM model was the optimal model for simulating the gasification process of modified coal coke, and the activation energy was between 211.36 kJ/mol and 228.81 kJ/mol.
研究领域:
能源科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2022
·
IF 5.64
Zechen Liu,Hourui Ren,Zhe Yang,Yinfei Liao,Yijun Cao
The effect of addition sequence for mixed collectors comprising of dodecane(D) and n-valeric acid(A) on low-rank coal flotation was explored by the following three sequences: D first and then A(D + A), A first and then D(A + D), D and A were added simultaneously(M). The total organic carbon , contact angle, zeta potential , and X-ray photoelectron spectroscopy results revealed that the coal had the highest adsorption capacity and the best hydrophobicity for the M, followed by A + D and D + A. The molecular dynamics simulation results indicated that for the M, the reagent molecules D and A worked together to facilitate the adsorption of the reagent molecules and solved some difficult-to-adsorb sites, not for the D + A and A + D. The M-type addition sequence would obtain the larger non-bonding interaction energy and more hydrogen bonds between collector molecules and the coal surface. Finally, the flotation experiments confirmed that the order of the flotation efficiency was M > A + D > D + A.
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
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2023
·
IF 2.2
Lun Du,Guanghua Zhang,Shining Hu,Jie Luo,Wanbin Zhang,Ce Zhang,Junguo Li,Junfeng Zhu
The hydrophilic surface and developed pore structure restricted the application of abundant low rank coals (LRC) for the preparation of coal water slurry (CWS) with high concentration. In this work, emulsified asphalt was applied as an effective and low cost modifier to modify coal surface and improve the slurry making performance of LRC. The successful modification was verified by various technologies, such as chemical titration, X-ray photoelectron spectroscopy (XPS) and Zeta potential measurements. The results revealed that the oxygen containing groups located at LRC surface were covered by emulsified asphalt, which further caused the decrease of Zeta potential. The influence of modification on wettability of coal was also evaluated by contact angle and moisture re-adsorption. It showed that the hydrophobicity of LRC significantly increased, which is accompanied with the reduction of inherent moisture. Besides, the results of nitrogen adsorption and scanning electron microscope (SEM) verified that the hydrophobic layer formed by emulsified asphalt blocked the pores of LRC. The modified LRC also exhibited better adsorption ability to the widely used anionic dispersant naphthalene sulfonate formaldehyde condensate (NSF) than that of raw coal (RC) and microwave dehydration coal (MDC). Anyhow, modified LRC possessed the characteristics as high rank coal. Afterwards, modified coal was applied to prepare CWS. The results showed that CWS prepared by modified LRC exhibited superior slurry making performance as compared to RC and MDC. The surface modification reduced the inherent moisture and promoted the adsorption of dispersant, which increased the free water amount and enhanced electrostatic repulsion and steric hindrance among coal particles. Accordingly, the maximum concentration for CWS increased, and the static stability enhanced.
研究领域:
能源科学
·
材料科学
✓ 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
危险品化学品经营许可证（带存储）