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Featured researches published by Houqin Wu.


Advances in Colloid and Interface Science | 2017

The flotation and adsorption of mixed collectors on oxide and silicate minerals

Longhua Xu; Jia Tian; Houqin Wu; Zhongyuan Lu; Wei Sun; Yuehua Hu

The analysis of flotation and adsorption of mixed collectors on oxide and silicate minerals is of great importance for both industrial applications and theoretical research. Over the past years, significant progress has been achieved in understanding the adsorption of single collectors in micelles as well as at interfaces. By contrast, the self-assembly of mixed collectors at liquid/air and solid/liquid interfaces remains a developing area as a result of the complexity of the mixed systems involved and the limited availability of suitable analytical techniques. In this work, we systematically review the processes involved in the adsorption of mixed collectors onto micelles and at interface by examining four specific points, namely, theoretical background, factors that affect adsorption, analytical techniques, and self-assembly of mixed surfactants at the mineral/liquid interface. In the first part, the theoretical background of collector mixtures is introduced, together with several core solution theories, which are classified according to their application in the analysis of physicochemical properties of mixed collector systems. In the second part, we discuss the factors that can influence adsorption, including factors related to the structure of collectors and environmental conditions. We summarize their influence on the adsorption of mixed systems, with the objective to provide guidance on the progress achieved in this field to date. Advances in measurement techniques can greatly promote our understanding of adsorption processes. In the third part, therefore, modern techniques such as optical reflectometry, neutron scattering, neutron reflectometry, thermogravimetric analysis, fluorescence spectroscopy, ultrafiltration, atomic force microscopy, analytical ultracentrifugation, X-ray photoelectron spectroscopy, Vibrational Sum Frequency Generation Spectroscopy and molecular dynamics simulations are introduced in virtue of their application. Finally, focusing on oxide and silicate minerals, we review and summarize the flotation and adsorption of three most widely used mixed surfactant systems (anionic-cationic, anionic-nonionic, and cationic-nonionic) at the liquid/mineral interface in order to fully understand the self-assembly progress. In the end, the paper gives a brief future outlook of the possible development in the mixed surfactants.


Journal of Colloid and Interface Science | 2017

New insights into the oleate flotation response of feldspar particles of different sizes: Anisotropic adsorption model

Longhua Xu; Jia Tian; Houqin Wu; Wei Deng; Yaohui Yang; Wei Sun; Zhiyong Gao; Yuehua Hu

The anisotropic adsorption of sodium oleate (NaOL) on feldspar surfaces was investigated to elucidate the different flotation properties of feldspar particles of four different size ranges. Microflotation experiments showed that the feldspar flotation recovery of particles with sizes spanning different ranges decreased in the order 0-19>19-38>45-75>38-45μm. Zeta potential and FTIR measurements showed that NaOL was chemically adsorbed on the Al sites of the feldspar surface. The anisotropic surface energies and broken bond densities estimated by density functional theory calculations showed that, although feldspar mostly exposed (010) and (001) surfaces, only the (001) surfaces contained the Al sites needed for NaOL adsorption. The interaction energies calculated by molecular dynamics simulations confirmed the more favorable NaOL adsorption on (001) than (010) surfaces, which may represent the main cause for the anisotropic NaOL adsorption on feldspar particles of different sizes. SEM measurements showed that the main exposed surfaces on coarse and fine feldspar particles were the side (010) and basal (001) ones, respectively. A higher fraction of Al-rich (001) surfaces is exposed on fine feldspar particles, resulting in better floatability compared with coarse particles. XPS and adsorption measurements confirmed that the Al content on the feldspar surface varied with the particle size, explaining the different NaOL flotation of feldspar particles of different sizes. Therefore, the present results suggest that coarsely ground ore should be used for the separation of feldspar gangue minerals. Further improvements in the flotation separation of feldspar from associated valuable minerals can be achieved through selective comminution or grinding processes favoring the exposure of (010) surfaces.


Minerals Engineering | 2013

Flotation and adsorption of mixed cationic/anionic collectors on muscovite mica

Longhua Xu; Houqin Wu; Faqin Dong; Li Wang; Zhen Wang; Junhui Xiao


Colloids and Surfaces A: Physicochemical and Engineering Aspects | 2016

Synergistic effect of mixed cationic/anionic collectors on flotation and adsorption of muscovite

Longhua Xu; Yuehua Hu; Jia Tian; Houqin Wu; Li Wang; Yaohui Yang; Zhen Wang


Applied Surface Science | 2014

Anisotropic adsorption of oleate on diaspore and kaolinite crystals: Implications for their flotation separation

Longhua Xu; Yuehua Hu; Faqin Dong; Zhiyong Gao; Houqin Wu; Zhen Wang


Separation and Purification Technology | 2016

Surface crystal chemistry of spodumene with different size fractions and implications for flotation

Longhua Xu; Yuehua Hu; Houqin Wu; Jia Tian; Jing Liu; Zhiyong Gao; Li Wang


Minerals Engineering | 2016

Selective flotation separation of spodumene from feldspar using new mixed anionic/cationic collectors

Longhua Xu; Yuehua Hu; Jia Tian; Houqin Wu; Yaohui Yang; Xiaobo Zeng; Zhen Wang; Jinming Wang


Applied Surface Science | 2017

Effect of Pb2+ ions on ilmenite flotation and adsorption of benzohydroxamic acid as a collector

Longhua Xu; Jia Tian; Houqin Wu; Zhongyuan Lu; Yaohui Yang; Wei Sun; Yuehua Hu


Journal of Cleaner Production | 2018

A novel approach for flotation recovery of spodumene, mica and feldspar from a lithium pegmatite ore

Jia Tian; Longhua Xu; Houqin Wu; Shuai Fang; Wei Deng; Tiefeng Peng; Wei Sun; Yuehua Hu


Mineralogy and Petrology | 2015

Erratum to: Effects of particle size and chain length on flotation of quaternary ammonium salts onto kaolinite

Longhua Xu; Yuehua Hu; Houqin Wu; Faqin Dong; Hao Jiang; Zhen Wang; Ruohua Liu

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Longhua Xu

Southwest University of Science and Technology

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Yuehua Hu

Central South University

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Jia Tian

Southwest University of Science and Technology

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Zhen Wang

Southwest University of Science and Technology

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Wei Sun

Central South University

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Faqin Dong

Southwest University of Science and Technology

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Li Wang

Central South University

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Zhiyong Gao

Central South University

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Shuai Fang

Southwest University of Science and Technology

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Zhongyuan Lu

Southwest University of Science and Technology

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