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Journal of Materials Science & Technology 2008年第5期24卷 797-802页

作者： dongping tao Faculty of Materials and Metallurgical Engineering Kunming University of Science and Technology Kunming 650093China

A novel thermodynamic model-the molecular interaction volume model （MIVM） which can be reduced to the Flory-Huggins equation of polymer solution was employed for the prediction of component activities in the ternary molten aluminosilicate slag CaO-Al2O3-SiO2 at different temperatures. The results show that the predicted values of activity of CaO, Al2O3 and SiO2 are in reasonably agreement with experimental data in some ranges of their concentrations which are about x1 〈0.25 for CaO, x2=0.05-0.55 for Al2O3 and x3=0.03-0.85 for SiO2. This further shows that MIVM requires only two binary parameters for each sub-binary system to predict activities of all components in a multicomponent solution and is the superior alternative in a molten slag.

关键词： Activity Prediction Molten aluminosilicate slag Molecular interaction volumemodel

Estimation of component activities in some oxide solid solutions by the molecular interaction vacancy model

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Acta Metallurgica Sinica(English Letters) 2011年第6期24卷 432-442页

作者： dongping tao Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Kunming 650093 China

The molecular interaction vacancy model （MIVM） is used to estimate simultaneously activities of all components in a range of entire composition of six binary oxide solid solutions and the MnO-FeO-CaO ternary solid solution by their binary infinite dilute activity coefficients. The average errors are the 0.03%-5.0% for the binaries and the 4.11%-25.2% for the ternary which is less than that （4.84%-41.2%） of the sub-regular solution model （SRSM）. This shows that MIVM is more effective and reliable than SRSM for the ternary and does not depend on a polynomial approximation with some ternary adjustable parameters.

关键词： Estimation Activity Oxide Solid solution Thermodynamic model

A novel molecular interaction chemical model for silicate melts

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Acta Metallurgica Sinica(English Letters) 2010年第5期23卷 381-395页

作者： dongping tao Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Kunming 650093 China

A novel molecular interaction chemical model （MICM） for silicate melts has been suggested based on statistical thermodynamics. It can simultaneously predict activities of all components in the CaO-FeO-SiO2 and CaO-Al2O3-SiO2 melts using only four binary parameters for each binary melt which can be determined by fitting activities of its two components. The results indicate that the predicted values of activity of FeO and SiO2 are in good agreement with the experimental data at 1823 K and 1873 K, and those of CaO, SiO2 and Al2O3 are in reasonable agreement with the graphical integration data of the Gibbs-Duhem equation. This shows that the model is effective in which the physical interaction plays a main role and the chemical one does the auxiliary function.

关键词： Activity Prediction Oxide melts Silicates Thermodynamic model

An innovative flake graphite upgrading process based on HPGR,stirred grinding mill, and nanobubble column flotation

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International Journal of Mining Science and Technology 2021年第6期31卷 1063-1074页

作者： Fangyuan Ma dongping tao Youjun tao Shuyong Liu Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education School of Chemical Engineering and TechnologyChina University of Mining and TechnologyXuzhou 221116China School of Resources and Environmental Engineering Shandong University of TechnologyZibo 255049China School of Mining Engineering University of Science&Technology LiaoningAnshan 114051China

Physical upgrading of graphite is typically achieved with many stages of grinding and flotation to produce a concentrate with approximately 95% carbon *** innovative grinding and column flotation process has been developed for efficient graphite upgrading to substantially simplify the process flowsheet and reduce operating *** this process,a high-pressure grinding roller(HPGR) and a stirred mill were employed as primary comminution techniques and a nanobubble flotation column as a key separation *** results obtained with a crystalline flake graphite sample with a carbon grade of 11.15% show that the novel process can produce a concentrate with 94.82% carbon grade and 97.89% recovery from an open circuit of one rougher and two cleaner flotation *** electron microscope(SEM)microphotographs indicate that HPGR offers the advantage of more effective protection of graphite flakes during *** test results show that stirred mill could not only protect graphite flakes but also promote the efficient liberation of *** with the traditional flotation process,nanobubble flotation can effectively recover ultrafine *** new process possesses a number of important advantages over the traditional method,including substantially higher graphite recovery,greatly simplified process flowsheet,better protection of flake size,reduced reagent consumption and process costs,etc.

关键词： Column flotation Graphite HPGR Microbubbles Nanobubbles Stirred mill

Surface nanobubble characterization and its enhancement mechanisms for fine-particle flotation:A review

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International Journal of Minerals,Metallurgy and Materials 2022年第4期29卷 727-738页

作者： Fangyuan Ma Patrick Zhang dongping tao School of Resources and Environmental Engineering Shandong University of TechnologyZibo 255049China Florida Industrial and Phosphate Research Institute Florida Polytechnic UniversityFlorida 33830USA

Froth flotation is often used for fine-particle separation,but its process efficiency rapidly decreases with decreasing particle *** efficient separation of ultrafine particles(UFPs)has been a major challenge in the mineral processing field for many *** recent years,the use of surface nanobubbles in the flotation process has been recognized as an effective approach for enhancing the recovery of *** with traditional macrobubbles,nanobubbles possess unique surface and bulk characteristics,and their effects on the UFP flotation behavior have been a topic of intensive *** review article is focused on the studies on various unique characteristics of nanobubbles and their mechanisms of enhancing the UFP *** purpose of this article is to summarize the major achievements on the two topics and pinpoint future research needs for a better understanding of the fundamentals of surface nanobubble flotation and developing more feasible and efficient processes for fine and UFPs.

关键词： surface nanobubbles characterization flotation ultrafine particles high-efficiency separation

A novel cationic collector for silicon removal from collophane using reverse flotation under acidic conditions

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International Journal of Minerals,Metallurgy and Materials 2023年第6期30卷 1038-1047页

作者： Zhongxian Wu dongping tao Youjun tao Man Jiang Patrick Zhang School of Resources and Environmental Engineering Shandong University of TechnologyZibo 255049China Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education China University of Mining&TechnologyXuzhou 221116China School of Chemical Engineering and Technology China University of Mining&TechnologyXuzhou 221116China Florida Industrial and Phosphate Research Institute Florida Polytechnic UniversityFlorida 33830USA

We analyzed a novel cationic collector using chemical plant byproducts,such as cetyltrimethylammonium bromide(CTAB)and dibutyl phthalate(DBP).Our aim is to establish a highly effective and economical process for the removal of quartz from collophane.A microflotation test with a 25 mg·L^(−1)collector at pH value of 6-10 demonstrates a considerable difference in the floatability of pure quartz and *** tests for a collophane sample subjected to the first reverse flotation for magnesium removal demonstrates that a rough flotation process(using a 0.4 kg·t−1 new collector at pH=6)results in a collophane concentrate with 29.33wt%P_(2)O_(5)grade and 12.66wt%SiO2 at a 79.69wt%P_(2)O_(5)recovery,providing desirable *** studies using Fourier transform infrared spectroscopy,zeta potential,and contact angle measurements show that the adsorption capacity of the new collector for quartz is higher than that for *** synergistic effect of DBP increases the difference in hydrophobicity between quartz and *** maximum defoaming rate of the novel cationic collector reaches 142.8 mL·min−*** is considerably higher than that of a conventional cationic collector.

关键词： cationic collector collophane defoaming quartz reverse flotation

Effects of key factors of rotary triboelectrostatic separator on efficiency of fly ash decarbonization

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International Journal of Mining Science and Technology 2017年第6期27卷 1037-1042页

作者： tao Youjun Zhang Ling tao dongping Xian Yushuai Sun Qixiao Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education China University of Mining & Technology Xuzhou 221116 China School of Chemical Engineering and Technology China University of Mining & Technology Xuzhou 221116 China School of Mining Engineering University of Science and Technology Liaoning Anshan 114051 China

On the basis of understanding the principle of rotary triboelectrostatic separation, dynamic analysis of charged fly ash particles aimed at determining the key factors and separation experiments to improve decarbonization efficiency had been carried out Variables of electrode plate voltage and corrected wind speed are the key factors which affect the decarbonization efficiency on the separation of fly ash, The results of separation experiments show that:(1) With the plate voltage increasing, the efficiency of decarbonization continuously rises and in its selected range, the optimal voltage level is 45 KV;(2) The corrected wind speed can impact the efficiency of decarbonization significantly: with the speed increasing, the efficiency of decarbonization shows a trend of first decline, then increase and decrease again, and in its selected range, the optimal speed is 2.0 m/s. This study is of significance for the improvement of rotary triboelectrostatic separation performance and its decarbonization separation efficiency.

关键词： Rotary triboelectrostatic separation Decarbonization Plate voltage Corrected wind speed Fly ash

Electrical properties of fly ash and its decarbonization by electrostatic separation

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International Journal of Mining Science and Technology 2015年第4期25卷 629-633页

作者： tao Youjun Ding Qingqing Deng Mingrui tao dongping Wang Xu Zhang Jie School of Chemical Engineering and Technology China University of Mining & Technology Tangshan Branch Tiandi Science & Technology Co. Ltd.

The basic principle of fly ash triboelectrification is analysed. The mineral electrical index and test method are introduced. The electric difference of different mineral composition of fly ash is discussed by analysis of chemical and mineral composition of fly ash in Xinwen power plant. The dielectric constant and charge-mass ratio of carbon and ash of fly ash are tested. Combined with the experimental study on rotary triboelectrostatic separation, the charged characteristic of fly ash particles with different size is gained. The results show that the dielectric constant of fly ash with different grain size decreased with the decrease of particle size, which lead to the poor electrical conductivity, Thus it can be seen that par- ticle size plays a leading role in conductivity, The charge of carbon and ash with each size increased with the decreased of particle size; and the charge-mass ratio between carbon and ash with the same size lar- ger with the decrease of size, which indicated that the finer particle size, the more favorable for triboelec- trification separation. In the same conditions, the best decarburization effect is realized when the particle size ranges from 0.038 to 0.074 ram, whose decarbonization rate and efficiency index reached 38.93% and 120.83% respectively.

关键词： Fly ash Rotary triboelectrostatic separation Electrical property Decarbonization emciency

Comparison of the Molecular Interaction Volume Model with the Unified Interaction Parameter Formalism in the Fe-Cr-Ni Liquid Alloys at 1873 K

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Journal of Materials Science & Technology 2006年第4期22卷 559-564页

作者： dongping tao Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Kunming 650093, China Faculty of Materials and Metallurgical Engineering Kunming University of Science and Technology Kunming 650093 China

The molecular interaction volume model (MIVM) for a general ternary system was deduced in detail for further clarifying and understanding its general multicomponent expression. Both MIVM and the unified interaction parameter formalism (UIPF) can be used to predict the activities of solutes and solvents in the Fe-Cr-Ni liquid alloys. But the former employs only the infinite dilute activity coefficients, and the later is not applicable without the dilute binary and ternary interaction parameters. MIVM has a certain physical meaning from the viewpoint of statistical thermodynamics, so it is an alternative for the estimation of activity coefficients of the solutes and solvents in a dilute or finite concentration metal solution where the interaction parameters are absent or their accuracies are questionable.

关键词： Activity Prediction Molecular interaction volume model Unified interaction parameter formalism

Comparison of the Molecular Interaction Volume Model with the Wagner Formulae in the Zn-Pb-In and Zn-Sn-Cd-Pb Dilute Solutions

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Journal of Materials Science & Technology 2004年第3期20卷 279-284页

作者： dongping tao Zhuo CHEN Dunfang LI Yifeng GAO Qianghua SHEN School of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Kunming 650093, China Sch. of Mat. and Metall. Eng. Kunming Univ. of Sci. and Technol. Kunming 650093 China

The coordination numbers in the molecular interaction volume model (MIVM) can be calculated from the commonphysical quantities of pure liquid metals. A notable feature of the model lie in its capability to predict the ther-modynamic properties of solutes in the Zn-Pb-In and Zn-Sn-Cd-Pb dilute solutions using only the binary infinitedilute activity coefficients, and the predicted values are in good agreement with the experimental data of the dilutesolutions.

关键词： Activity Prediction Dilute metal solution Molecular interaction volume model