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1
Content available Mechanisms for the improved flotation of inherently hydrophobic graphite in electrolyte solution
Lai Q., Liao Y., Liu Z., He Y., Zhao Y.
Physicochemical Problems of Mineral Processing
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2018
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Vol. 54, iss. 3
944--954
EN
It is well documented that unavoidable ions in a pulp such as Mg2+, Ca2+, and K+ have a significant effect on the interaction for particles, especially for flotation of metallic sulfide minerals and clay minerals. In this study, the effect of electrolytes on the flotation of inherently hydrophobic mineral-graphite was studied. It was found that the zeta potential showed a dramatic decrease, and the reagent adsorption capacity of mineral enhanced in the present of electrolytes. The possible mechanism responsible for improved recovery was investigated by electrokinetic, surface tension and ions adsorption tests. It is likely that the hydrophobic force is stronger than the electrostatic force due to the reduced potential of graphite. This might be in favor of the formation of hydrophobic oil film leading to an increase in the graphite floatability. The experiments provided a new spectacle to study inherently hydrophobic mineral processing with electrolyte solution.
2
Content available Implication and collecting mechanism of emulsified sodium vegetable oleate on fluorite flotation
Sun L., Liu J., Liao Y., Sun L., Liu J.
Physicochemical Problems of Mineral Processing
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2018
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Vol. 54, iss. 2
211--219
EN
The emulsified sodium vegetable oleate (ESVO) was prepared with low-cost vegetable oleate. Using ESVO as a collector, the flotation performance of fluorite had been investigated comparing with sodium oleate at a temperature of 20 ± 2 °C. The results of flotation showed that ESVO had better collecting performance than the sodium oleate. The interaction mechanism of these two collectors with fluorite was studied by the zeta potential, FTIR spectra and laser grain-size tests. Both ESVO and sodium oleate changed fluorite zeta potential by electrostatic attraction and chemical adsorption, and generated calcium carboxylate on the fluorite surface. Moreover, it was concluded that higher fluorite recovery was a consequence of ESVO smaller surface tension comparing to sodium oleate.
3
Content available remote Quinoxaline-based small molecules: synthesis and investigation on their optoelectronic properties
Deng J., Tao Q., Yan D., Huang X., Liao Y.
Materials Science Poland
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2018
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Vol. 36, No. 2
167--176
EN
Small molecules of ThQuTh, CzQuTh, CzQuCz and TPAQuCz were designed and synthesized, based on quinoxaline acceptor, and electron donating groups, i.e. alkyl-thioephene, carbazole and triphenylamine on both side chains and molecular backbones. Their thermal, optical and electrochemical properties were systematically compared and studied. The absorption spectra of the small molecules were strongly affected by the donor units attached to quinoxaline. Strong electron donating groups, such as carbazole on the molecular backbone would lower optical band gap, resulting in a wide absorption and the strong donor on the side chain would enhance the absorption intensity in short wavelength region. The highest occupied molecular orbital (HOMO) energy levels of the four molecules were up-shifted with increasing the electron donating properties of donor units. The bulk-heterojunction organic solar cells with a device structure of ITO/PEDOT:PSS/SMs:PC61BM/LiF/Al were fabricated, in which the small molecules functioned as donors while PC61BM as acceptor. Because the electron-donating ability of carbazole (Cz), triphenylamine (TPA) is higher than that of thiophene (Th), CzQuTh, CzQuCz and TPAQuCz show higher power conversion efficiency (PCE) than that of ThQuTh. Furthermore, being the strongest in absorption intensity and widest in absorption spectrum, TPAQuCz has the highest power conversion efficiency. Further improvement of the device efficiency by optimizing the device structure is currently under investigation
4
Content available 3D loss and heat analysis at the end region of 4-poles 1150 MW nuclear power turbine generator
Zhou G., Han L., Fan Z, Liao Y., Huang S.
Archives of Electrical Engineering
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2014
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Vol. 63, nr 1
47-61
EN
To study the principle of loss and heat at the end region of large 4-poles nuclear power turbine generator, 3D transient electromagnetic field and 3D steady temperature field finite element (FE) models of the end region are established respectively. Considering the factors such as rotor motion, core non-linearity and time-varying of electromagnetic field, the anisotropic heat conductivity and different heat dissipation conditions of stator end region, a 50 Hz, 1150 MW, 4-poles nuclear power turbine generator is investigated. The loss and heat at the generator end region are calculated respectively at no-load and rated-load, and the calculation results are compared with the test data. The result shows that the calculation model is accurate and the generator design is suitable. The method is valuable for the research of loss and heat at the end region of large 4-poles nuclear power turbine generator and the improvement of the generator’s operation stability. The method has been applied successfully for the design of the larger nuclear power turbine generators.
5
Content available Calculation and analysis of the loss and heat on damper bars in large tubular hydro-generator
Liao Y., Fan Z.-N., Han L., Xie L.-D.
Archives of Electrical Engineering
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2013
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Vol. 62, nr 1
43-54
EN
In order to research the losses and heat of damper bars thoroughly, a multislice moving electromagnetic field-circuit coupling FE model of tubular hydro-generator and a 3D temperature field FE model of the rotor are built respectively. The factors such as rotor motion and non-linearity of the time-varying electromagnetic field, the stator slots skew, the anisotropic heat conduction of the rotor core lamination and different heat dissipation conditions on the windward and lee side of the poles are considered. Furthermore, according to the different operating conditions, different rotor structures and materials, compositive calculations about the losses and temperatures of the damper bars of a 36 MW generator are carried out, and the data are compared with the test. The results show that the computation precision is satisfied and the generator design is reasonable.
6
Content available remote Analysis of the Loss and Heat on Damper Bars in Large Tubular Hydro-Generator base on the 3D Electromagnetic-Temperature field Calculation
Liao Y., Fan Z., Han L., Xie L.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 5b
97-100
EN
In order to research the losses and heat of damper bars thoroughly, a 3D moving electromagnetic field FE model of tubular hydrogenerator and a 3D temperature field FE model of the rotor are built respectively. Furthermore, according to the different operating conditions, the compositive calculations about the losses and temperatures of the damper bars of a 36MW tubular hydro-generator are carried out, and the data are compared with the test. The results show that the computation precision is satisfied.
PL
Badano straty i nagrzewanie w prętach tłumika hydrogeneratora wykorzystując 3D model elektromagnetyczny. Badano rozkład temperatury oraz pola elektromagnetycznego.
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