Key Laboratory for Ecological Metallurgy of Multimetallic Mineral

Shenyang, China

Key Laboratory for Ecological Metallurgy of Multimetallic Mineral

Shenyang, China
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Min Y.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral | Min Y.,Northeastern University China | Shi Z.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral | Shi Z.,Northeastern University China | And 2 more authors.
Ultrasonics Sonochemistry | Year: 2017

Under the application of ultrasound, the organic polymers can be degraded for the reason of breakage of C-C or C-N bond induced by the cavitation effect, similar to organic polymers, the silicate melts are also one typical polymer connected with Si-O bonds. To verify the prediction of the depolymerization of silicate melt, the ultrasound was applied to one kind of silicate melt for the first time via a special designed experimental system. Results showed that, under the applying of the ultrasound, the Si-O (bridged O) bonds in the structure units of the silicate melt can be broken, which decreases the polymerization degree and the viscosity. Under the higher power of applied ultrasound, the polymerization degree and viscosity of the silicate melt further decrease. Unlike some organic polymers, once stopping applying ultrasound, the broken lower polymerized units reconnect to form higher polymerized units gradually, the degree of the polymerization and the viscosity reverse to its nature state of the silicate melts. According to these results, the potential applications in the steel continuous casting process and electrolytic aluminum process are predicted. © 2017 Elsevier B.V.


Li X.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral | Min Y.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral | Wang B.,Laiwu Steel Group | Jiang M.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2015

The FH40 ship plates containing different Mg, Zr contents are refined with vacuum induction furnace, and the relationship between magnesium and zirconium addition and the decomposition of austenite during continuous cooling rate from 0.1 ℃/s to 30 ℃/s is systematically investigated by a Gleeble-3800 thermal simulator. Continuous cooled microstructure is observed by means of optical microscope. Dilatometric experiments and metallographic observations show that, Mg, Zr and Mg-Zr addition can affect the starting temperatures of the γ-α phase transformation and the pearlite transformation. Mg and Mg-Zr addition suppresses the proeutectoid ferrite transformation and promotes the bainite transformation. The matrix can be dominated as bainite at cooling rate from 5 ℃/s to 30 ℃/s for the Mg-containing steels. It is obviously shown that the addition of zirconium has a significant effect in promoting the nucleation of ferrites. However, the bainite transformation is not well developed, but an evident suppression of the transformation is emerged for the single Zr addition steel. The above studies can provide theoretical foundations for the application of magnesium and zirconium in steel. ©, 2015, Chongqing Medical University. All right reserved.


Zhang W.,Northeastern University China | Zhang W.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral | Zhang J.H.,Northeastern University China | Zhang J.H.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral | And 5 more authors.
Ironmaking and Steelmaking | Year: 2014

Non-stoichiometry influences both the thermodynamic and kinetic analyses of the iron oxide redox processes. The thermochemical data of iron oxide redox reactions in various textbooks are not consistent, and the kinetic characteristics are not well understood because of the nonstoichiometry. To clarify such confusions, some famous thermodynamic data are compared, and highly precise experimental work conducted for verification. It is shown that the thermodynamic data for the pure iron oxide reduction reactions from JANAF agree well with the experimental results; the eutectoid temperature of iron oxides was proven to be 576°C; Dieckmann's defect model of magnetite was proven in good agreement with the experimental results only at high oxygen activities but not low oxygen activities; and the dependences of iron deficiency on Δwt-% (weight loss ratio) and Fe2+ % (ferrous ratio) were calculated and experimentally verified in pure iron oxides reduction processes. © 2014 Institute of Materials, Minerals and Mining.


Li M.,Northeastern University China | Li M.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral | Gao B.,Northeastern University China | Gao B.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral | And 10 more authors.
Electrochimica Acta | Year: 2015

Urea-acetamide-lithium halide (LiBr, LiCl, LiF) low-temperature molten salts were used as the electrolytes to study the electrodeposition of aluminum on a tungsten electrode. Al(III) was introduced into the salts by the addition of AlCl3. The reduction potential of Al(III) is dependent on the molar ratio of AlCl3/(urea + acetamide). The nucleation mechanism of aluminum on the tungsten electrode was determined to be three-dimensional instantaneous nucleation with diffusion-controlled growth at 333 K. Aluminum coatings were prepared at different cathodic potentials (from -0.10 V to -0.25 V) and different temperatures (from 313 K to 343 K) in urea-acetamide-LiBr molten salt. Scanning electron microscope (SEM) and X-ray diffraction (XRD) were used to characterize the surface of the deposits. The SEM images indicate that the morphologies of the aluminum deposits are dependent on the deposition potential and temperature. The XRD analysis confirms that the obtained deposits are pure aluminum. © 2015 Elsevier Ltd. All rights reserved.


Min Y.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral | Zhong M.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral | Huang J.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral | Liu C.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral | Jiang M.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral
Steel Research International | Year: 2014

Quenched glass samples of CaO-SiO2-Al2O 3-Na2O-CaF2 system were prepared within the composition of continuous casting mould flux, and the chemical composition and Raman spectra were detected subsequently. The degree of polymerization and structural behavior of Al3+ were investigated on the base of the quantitative calculation of structure species. The experimental data showed that the dominant structure species are Qi (i = 0, 1, 2) of the Si-O tetrahedrons in the liquid mould flux, and the degree of polymerization decreases with the increasement of basicity and the decreasement of Al 2O3 content. Al-O tetrahedrons and Al3+ cations coexist in the liquid mould flux, and the mole fraction of Al-O tetrahedrons increases with the increasement of basicity and Al2O3 content. Under the condition of the mole ratio Al/(Al + Si) < 0.19, the structural behavior of Al3+ is stable in the liquid mould flux. Considering the variation of mould flux composition during Al-killed steel continuous casting process, the initial content of Al2O3 and SiO2 in the mould flux should be controlled appropriately according to the transition point Al/(Al + Si). In the liquid mould flux of CaO-SiO2-Al2O3-Na2O-CaF2 system, Si-O tetrahedrons are the dominant structure species, and the degree of polymerization decreases with the increasement of basicity and the decreasement of Al2O3 content. Al-O tetrahedrons and Al3+ cations coexist in the liquid mould flux, and the mole fraction of Al-O tetrahedrons increases with the increasement of basicity and Al 2O3 content. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Li X.L.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral | Shi P.Y.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral | Yue Y.Y.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral | Xie Q.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral | And 2 more authors.
Applied Mechanics and Materials | Year: 2014

The hydrochloric acid pickling process which is widely applied in carbon steel pickling ensures high speeds with little pollution. In this research, hydrochloric acid pickling process was introduced into stainless steel pickling to improve the surface integrity. Research indicated that the impedance spectrum obtained from 430SS in HCl solution consisted of a capacitive loop at high frequencies and an inductive loop at low frequencies. As the concentration of hydrochloric acid rose, the radiuses of the capacitive loop decreased.And the corrosion potential of 430SS in hydrochloric acid solution moved to positive direction with band to a narrow 0.1V.And high HCl concentration more markedly influenced the charge-transfer resistance. © (2014) Trans Tech Publications, Switzerland.


Li M.,Northeastern University China | Li M.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral | Gao B.,Northeastern University China | Gao B.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral | And 11 more authors.
Electrochimica Acta | Year: 2015

Abstract The electrochemical behavior of nickel was studied by cyclic voltammetry and chronoamperometry techniques at 353 K using a tungsten electrode in urea-acetamide-LiBr low-temperature molten salt. The cyclic voltammograms indicate that the reduction of Ni(II) to Ni proceeds via a single-step, two-electron transfer process. Chronoamperometric measurements show that the electrodeposition of nickel on the tungsten electrode involves three-dimensional (3D) progressive nucleation under diffusion-controlled growth at 353 K. Nickel coatings were prepared at different cathodic potentials (-0.70 to -0.85 V) and different temperatures (343-373 K) in urea-acetamide-LiBr molten salt. The deposits were characterized by scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The SEM images reveal that uniform, dense, and compact deposits were obtained at more positive cathodic potentials within the temperature range of 343-363 K. The EDS and XRD analyses confirm that the obtained deposits are pure nickel. © 2015 Elsevier Ltd. All rights reserved.


Jiang M.F.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral | Li X.L.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral | Yue Y.Y.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral | Shi P.Y.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral | Liu C.J.,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral
Materials Research Innovations | Year: 2014

The hydrochloric acid pickling process ensures high speeds with little pollution, for which a systematic study of the electrochemical behaviour of stainless steel in the oxidised hydrochloric electrolytes is of great significance. In this research, proper oxidiser was introduced into pickling solution with different concentrations of hydrochloric. Research indicated that as the concentration of hydrochloric acid rose, the charge transfer resistance Rt decreased, and that the decrease was more significant with high HCl content. When the HCl concentration was below 15%, the reaction was controlled by the anodic reaction, while the reaction was controlled by the cathodic reaction when the HCl concentration was above 15%. As the concentration of hydrochloric acid rose, the residue of oxide scales reduced and the surface of the stainless steel became soomther. © W. S. Maney & Son Ltd.

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