MINERALS ENGINEERING
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2025
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IF 5
Zeen Yu,Pingfeng Fu,Lianghua Wang,Yuliang Zhang,Wei Deng
Advanced oxidation processes for treating flotation wastewater suffer from low oxidation efficiency and secondary pollution. Here, the novel microbubble catalytic ozonation, combining steel slag as a cost-effective and efficient catalyst with microbubbles as an advanced form of aeration, was proposed to treat simulated flotation wastewater containing butyl xanthate (BX), O-isopropyl-N-ethyl thionocarbamate (Z-200), terpineol, and sodium humate. The chemical oxygen demand (COD) removal efficiency and mineralization rates of organic flotation reagents were compared by macrobubble/microbubble ozonation, macrobubble/microbubble catalytic ozonation. The employing of microbubbles increased the removal efficiency of COD in ozonation from 31.45 % to 50.42 %, followed by the mineralization rates of C, S, and N increasing from 19.57 % to 33.45 %, 28.90 % to 48.16 %, and 21.80 % to 31.82 %, respectively. Importantly, the addition of steel slag (0.5 g/L) further enhanced COD removal efficiency (58.34 %) and C (41.56 %), S (53.76 %), N (37.88 %) mineralization rates. Both EPR and dissolved ozone concentration variations demonstrated that steel slag effectively promoted ozone decomposition and hydroxyl radical (•OH) generation, confirming its catalytic role. The degradation pathways of organic flotation reagents with microbubble catalytic ozonation were proposed, mainly relying on the oxidation of organic flotation reagents by the products generated from ozone decomposition. The combined application of steel slag and microbubbles effectively overcame the low ozone solubility and slow •OH generation rate associated with ozonation alone, presenting a powerful strategy for enhancing organic flotation reagents degradation.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Weiwei Wang,Zhengyao Li,Mingxing Chen,Zuchao Pan,Zhenyu Wang,Zhenyuan Zhou,Chang Zhang,Jiming Zhang,Weiyao Zhu
This study systematically investigates the crystal properties of bastnaesite and the adsorption mechanisms of salicylhydroxamic acid (SHA) and 2-hydroxy-3-naphthyl hydroxamic acid (2-H-3-NHA) onto the bastnaesite (100) surface using density functional theory (DFT) calculations. Computational results indicate that bastnaesite cleavage primarily occurs along Ce–O and Ce–F ionic bonds during dissociation, with the {100} plane identified as the most preferential cleavage direction due to its lowest surface energy. The chemical reactivity and adsorption behaviors of both collectors were thoroughly examined with adsorption energy calculations quantifying their surface affinity. Comparative analysis reveals that 2-H-3-NHA demonstrates significantly greater adsorption stability and chemical reactivity than SHA. This enhanced performance is attributed to the naphthalene ring’s superior steric hindrance effect and the presence of longer carbon chains compared to the benzene ring in SHA. These findings are consistent with results from the pure mineral flotation tests. Collectively, this work provides an atomic-level understanding of hydroxamic acid collector interactions with bastnaesite surfaces, offering valuable guidance for designing high-performance rare earth mineral flotation reagents.
研究领域:
矿物加工工程
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计算材料学
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表面科学
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资源与环境科学
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冶金物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Qiming Zhuo,Wenli Liu,Penghui Wang,Jiushuai Deng,Peng Xi,Yuzhe Hua
The precise separation of macerals is the premise and foundation for the efficient utilization of coal resources, and flotation is the separation method with the greatest industrial potential. The differences in the surface hydrophobicity of macerals provide the basis for flotation, but the complexity of their surface properties makes separation challenging. In this study, sub-bituminous coal was used to obtain vitrinite and inertinite , and a detailed analysis was carried out on the samples. The surface morphologies of vitrinite and inertinite were observed in the QI TM (quantitative imaging) mode of AFM (atomic force microscope) to explore the adsorption of the reagents. The effect of the reagents on the interaction forces between the coal particles and bubbles was measured to reveal the change in hydrophobicity. The attachment performance of macerals under different reagent treatments was investigated using a laboratory-built apparatus. Overall, the results demonstrated that the difference in zeta potential between vitrinite and inertinite was a viable approach for separating the macerals. CTAB adsorption on coal samples changed the surface morphology and the interaction force between particles and bubbles. Interestingly, CTAB adsorption on the gas–liquid interface decreased the interaction force. Vitrinite and inertinite attachment performances were enhanced when Al 3+ and SDS were used simultaneously.
研究领域:
矿物加工
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表面化学
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煤炭科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2014
·
IF 1.714
An Liu,Min-qiang Fan,Pan-pan Fan
In this study, a modification of oil assisted flotation processes of quartz particles has been proposed, which is based on introduction of miscible Dodecylamine (DDA)-Kerosene as collector with DDA cationic surfactant coated on kerosene to the hydrophilic quartz particles in the pulp. The property of miscible DDA–Kerosene emulsion was investigated. Due to the adsorption of DDA at kerosene/water interface, a smaller and uniform kerosene emulsion formed. Addition of cationic surfactant to the kerosene emulsion changed the zeta potential value from negative to positive, which resulted in enhancing the adhesion of the oil droplets to negatively charged quartz. The results showed that agglomeration and flotation process can be realized simultaneously with DDA–Kerosene. The agglomeration of fine quartz minerals in the presence of miscible DDA–Kerosene led to the formation of very large compact agglomerates resulting in increasing hydrophobicity of the particles and inducing a higher probability of collision and adhesion to air bubble. Experimental data indicated that miscible DDA–Kerosene had better selectivity and stronger collectability to quartz than DDA–HCl, which can be used as an efficient collector in the reverse flotation of magnetic separation concentrate of TISCO. At the same DDA dosage (60 g/t), separation efficiency got to 18.53% when using DDA–HCl as collector; while a better result was obtained with DDA–Kerosene, the efficiency of separation reached 59.07% which was identical with 120 g/t DDA–HCl.
研究领域:
矿物加工工程
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表面与界面化学
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胶体与界面科学
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资源综合利用
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浮选药剂
✓ 已验证
DOI
高影响因子
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