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  • 1.
    Akhtar, Farid
    et al.
    Institute of Powder Metallurgy, University of Science & Technology, Beijing.
    Guo, Shi-ju
    Institute of Powder Metallurgy, University of Science & Technology, Beijing.
    Development of Si 3 N 4/Al composite by pressureless melt infiltration2006In: Transactions of Nonferrous Metals Society of China, ISSN 1003-6326, E-ISSN 2210-3384, Vol. 16, no 3, p. 629-632Article in journal (Refereed)
    Abstract [en]

    Pressureless infiltration processs to synthesize Si3N4/Al composite was investigated. Al-2%Mg alloy was infiltrated into Si3N4 and Si3N4 containing 10% Al2O3 preforms in the atmosphere of nitrogen. It is possible to infiltrate Al-2% Mg alloy in Si3N4 and Si3N4 containing 10% Al2O3 preforms. The growth of the dense composite of useful thickness was facilitated by the presence of magnesium powder at the interface and by flowing nitrogen. During infiltration Si3N4 reacted with aluminium to form Si and AlN, the growth of composite was found to proceed in two ways, depending on the Al2O3 content in the initial preform. Firstly, preform without Al2O3 content gives rise to AlN, Al3.27Si0.47 and Al type phases after infiltration. Secondly, perform with 10% Al2O3 content gives rise to AlN-Al2O3 solid solution phase (AlON), MgAl2O4, Al and Si type phases. AlON phase was only present in composite, containing 10% Al2O3 in the Si3N4 preforms before infiltration.

  • 2. Awe, Samuel Ayowole
    et al.
    Khoshkhoo, Mohammad
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Kruger, Paul
    Boliden Mineral AB.
    Sandström, Åke
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Modelling and process optimisation of antimony removal from a complex copper concentrate2012In: Transactions of Nonferrous Metals Society of China, ISSN 1003-6326, E-ISSN 2210-3384, Vol. 22, no 3, p. 675-685Article in journal (Refereed)
    Abstract [en]

    The modelling and optimization for the alkaline sulphide leaching of a complex copper concentrate containing 1.69% Sb and 0.14% Sn were studied. Response surface methodology, in combination with central composite face-centred design (RSM-CCF), was used to optimise the operating parameters. The leaching temperature, sulphide ion concentration and solid concentration werechosen as the variables, and the response parameters were antimony and tin recovery, and the time required to achieve 90% Sb dissolution. It was confirmed that the leaching process was strongly dependent on the reaction temperature as well as the sulphide ion concentration without any significant dependence on the solid concentration. Furthermore, a mathematical model was constructed tocharacterise the leaching behaviour. The results from the model allow identification of the most favourable leaching conditions. The model was validated experimentally, and the results show that the model is reliable and accurate in predicting the leaching process.

  • 3.
    Dianzuo, Wang
    et al.
    Central South University, Changsha.
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Fundamentals and application of biohydrometallurgy: a special workshop for the XXIV International Mineral Processing Congress (IMPC), Beijing 2008 Section One: BioproMiner International Workshop on Bioprocessing of Minerals Foreword2008In: Transactions of Nonferrous Metals Society of China, ISSN 1003-6326, E-ISSN 2210-3384, no 6Article in journal (Refereed)
  • 4.
    Sun, Zhong-Xi
    et al.
    Luleå tekniska universitet.
    Forsling, Willis
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Chen, J.
    Luleå tekniska universitet.
    The SiO2 H2O interface and effects on quartz activation in flotation system1992In: Transactions of Nonferrous Metals Society of China, ISSN 1003-6326, E-ISSN 2210-3384, Vol. 2, no 2, p. 16-227Article in journal (Refereed)
    Abstract [en]

    The correlation between surface complexation at the SiO sub 2 H sub 2 O interface and quartz flotation behavior was studied. Computer assisted calculations, using the programs SOLGASWATER, were adapted to construct distribution diagrams of surface speciation in the SiO sub 2 -metal ion--H exp + system in aqueous solutions. Equilibrium constants for both surface and solution reactions were introduced in the composition matrix. Surface complexation, surface change and flotation results were compared and a good agreement was obtained. Furthermore, flotation mechanisms of quartz activation by common metal ions like Ca exp 2+ , Mg exp 2+ , Fe exp 3+ are quantitatively discussed based on the surface reaction equilibrium constants.

  • 5.
    Tian, Jian-jun
    et al.
    Institute of Powder Metallurgy, School of Materials Science and Engineering, University of Science and Technology, Beijing.
    Qu, Xuan-hui
    Institute of Powder Metallurgy, School of Materials Science and Engineering, University of Science and Technology, Beijing.
    Zhang, Shen-gen
    Institute of Powder Metallurgy, School of Materials Science and Engineering, University of Science and Technology, Beijing.
    Akhtar, Farid
    Institute of Powder Metallurgy, School of Materials Science and Engineering, University of Science and Technology, Beijing.
    Tao, Si-Wu
    Institute of Powder Metallurgy, School of Materials Science and Engineering, University of Science and Technology, Beijing.
    Du, Xue-Li
    Institute of Powder Metallurgy, School of Materials Science and Engineering, University of Science and Technology, Beijing.
    Influence of heat treatment on fracture and magnetic properties of radially oriented Sm 2 Co 17 permanent magnets2007In: Transactions of Nonferrous Metals Society of China, ISSN 1003-6326, E-ISSN 2210-3384, Vol. 17, no 3, p. 491-495Article in journal (Refereed)
    Abstract [en]

    The quenching, fracture and aging treatment of radially oriented Sm2Co17 ring magnets were investigated. The results indicate that the ring magnets have obvious anisotropy of thermal expansion, which easily leads to the splits of the magnets during quenching. The fracture is brittle cleavage fracture. The difference (δa) of the expansion coefficient reaches the maximum value at 800–850 °C. So, various quenching processes at different steps are adopted in order to reduce the splits. When the magnets are aged. 1:5 phase precipitates from the 2:17 matrix phase and forms a cellular microstructure with 2:17 phase. BHmax and 3Hc reach the maximum value 226 kJ/m3 and 2170 kA/m after being aged at 850 °C for 4 h and 8 h, respectively. The aging treatment at 850 °C has little influence on remanence(Br), which can always keep a high value (≥1.0 T). Through appropriate heat treatment, the ring magnets have uniform cellular microstructure and excellent magnetic properties: Br1.0T, 3Hc≥2 100 kA/m, BHmax≥220 kJ/m3.

  • 6.
    Vilinska, Annamaria
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Rao, K. Hanumantha
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Leptosririllum ferrooxidans-sulfide mineral interactions with reference to bioflotation nad bioflocculation2008In: Transactions of Nonferrous Metals Society of China, ISSN 1003-6326, E-ISSN 2210-3384, Vol. 18, no 6, p. 1403-1409Article in journal (Refereed)
    Abstract [en]

    The adhesion of ferrous ions grown Leptospirillum ferrooxidans cells on pyrite and chalcopyrite minerals was investigated through adsorption, Zeta-potential and diffuse reflectance FT-IR measurements. The influence of bacterial species on minerals floatability was determined by Hallimond flotation tests while the flocculation behaviour was examined by Turbiscan measurements. The minerals iso-electric point (pH 6.5-7.5) after interaction with bacterial cells shifted towards cells iso-electric point (pH 3.3), indicating the chemical nature of cells adsorption on mineral surfaces. The FT-IR spectra of minerals treated with bacterial cells showed the presence of all the cell functional groups signifying cells adsorption. The bacterial cells adsorption on chalcopyrite was higher compared with pyrite, which agreed with cells greater depression effect on chalcopyrite flotation and pronounced flocculation behaviour in comparison with pyrite.

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