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Huang J.,Inner Mongolia Key Laboratory for Utilization of Bayan Obo Multi Metallic Resources | Huang J.,Northeastern University China | Wu W.-F.,Inner Mongolia Key Laboratory for Utilization of Bayan Obo Multi Metallic Resources | Liu H.-F.,Baosteel | And 2 more authors.
Kang T'ieh/Iron and Steel | Year: 2014

Impinging gas jet cooling is the most important cooling method in a continuous steel strip annealing and galvanizing production. Different cooler structures significantly affect the cooling performance. Numerical simulation on strip continuous annealing line cooled with duct cooling process were performed after grid independence test. The simulation area was divided into two sub regions. The simulation results reveal the characteristics of flow field and temperature field. Formula for the pressure and flow of the cooler is obtained in the area of bellows and ducts, surface convective heat transfer coefficient and cooling rate of the strip are obtained in the area of impinging jet cooling, the average convection heat transfer coefficient is 117.29 W/(m2 ̇ K) and strip cooling rate is 14.0°C/s by typical operating conditions. Source


Jiang Y.-J.,Inner Mongolia Key Laboratory for Utilization of Bayan Obo Multi Metallic Resources | Jiang Y.-J.,Inner Mongolia University of Science and Technology | Deng Y.-C.,Inner Mongolia University of Science and Technology | Bu W.-G.,Inner Mongolia Key Laboratory for Utilization of Bayan Obo Multi Metallic Resources | Bu W.-G.,Inner Mongolia University of Science and Technology
Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science | Year: 2015

Gas selective reduction–oxidation (redox) and melting separation were consecutively applied to electrode materials of AB5-type Ni-metal hydride batteries leading to the production of a Ni-Co alloy and slag enriched with rare earth oxides (REO). In the selective redox process, electrode materials were treated with H2/H2O at 1073 K and 1173 K (800 °C and 900 °C). Active elements such as REs, Al, and Mn were oxidized whereas relatively inert elements such as Ni and Co were transformed into their elemental states in the treated materials. SiO2 and Al2O3 powders were added into the treated materials as fluxes which were then melted at 1823 K (1550 °C) to yield a Ni-Co alloy and a REO-SiO2-Al2O3-MnO slag. The high-purity Ni-Co alloy produced can be used as a raw material for AB5-type hydrogen-storage alloy. The REO content in slag was very high, i.e., 48.51 pct, therefore it can be used to recycle rare earth oxides. © 2015, The Minerals, Metals & Materials Society and ASM International. Source

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