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Yi Zhang – One of the best experts on this subject based on the ideXlab platform.

  • leaching of silica from vanadium Bearing Steel slag in sodium hydroxide solution
    Hydrometallurgy, 2010
    Co-Authors: Qinggui Xiao, Yin Chen, Hongbin Xu, Yi Zhang

    Abstract:

    The work aims to selectively extract silica from vanadium-Bearing Steel slag by a leaching process. The effects of the particle size, the ratio of solid to liquid, the concentration of sodium hydroxide solution and the leaching temperature on the leaching behavior of silica from vanadium-Bearing Steel slag were investigated. The leaching kinetics of silica from vanadium-Bearing Steel slag in 30-50% w/w NaOH solutions was studied at 240 degrees C and the shrinking-core model was established to express the leaching kinetics of silica. The data showed that the leaching rate was controlled by the chemical reaction on the system interface and the activation energy for the process was found to be 36.4 kJ mol(-1). By the leaching process, the majority of silica could be removed effectively from the vanadium-Bearing Steel slag and a residue with a low SiO(2) content of 4.28% and a high V(2)O(5) content of 11.15% was obtained. Under these conditions there was partial dissolution of Al and slight dissolution of Cr, Mn and Ti. (C) 2010 Elsevier B.V. All rights reserved.

Qinggui Xiao – One of the best experts on this subject based on the ideXlab platform.

  • leaching of silica from vanadium Bearing Steel slag in sodium hydroxide solution
    Hydrometallurgy, 2010
    Co-Authors: Qinggui Xiao, Yin Chen, Hongbin Xu, Yi Zhang

    Abstract:

    The work aims to selectively extract silica from vanadium-Bearing Steel slag by a leaching process. The effects of the particle size, the ratio of solid to liquid, the concentration of sodium hydroxide solution and the leaching temperature on the leaching behavior of silica from vanadium-Bearing Steel slag were investigated. The leaching kinetics of silica from vanadium-Bearing Steel slag in 30-50% w/w NaOH solutions was studied at 240 degrees C and the shrinking-core model was established to express the leaching kinetics of silica. The data showed that the leaching rate was controlled by the chemical reaction on the system interface and the activation energy for the process was found to be 36.4 kJ mol(-1). By the leaching process, the majority of silica could be removed effectively from the vanadium-Bearing Steel slag and a residue with a low SiO(2) content of 4.28% and a high V(2)O(5) content of 11.15% was obtained. Under these conditions there was partial dissolution of Al and slight dissolution of Cr, Mn and Ti. (C) 2010 Elsevier B.V. All rights reserved.

Naeem Ul Haq Tariq – One of the best experts on this subject based on the ideXlab platform.

  • very high cycle fatigue behavior of Bearing Steel with rare earth addition
    International Journal of Fatigue, 2020
    Co-Authors: Chaoyun Yang, Naeem Ul Haq Tariq, Yikun Luan, Dianzhong Li, Yiyi Li

    Abstract:

    Abstract This study aims to clarify the effect of rare earth (RE) addition on the very high cycle fatigue (VHCF) behavior of high-carbon chromium Bearing Steel. For this purpose, ultrasonic tension-compression fatigue tests were carried out on specimens extracted from Bearing Steels with and without RE addition. As a result, RE addition can prolong the fatigue life of Bearing Steel over 10 times and improve the fatigue limit at 109 cycles by 9.4% from 720 MPa to 788 MPa, which mainly result from the modification of RE elements to common CaO-Al2O3-MgO-SiO2-CaS inclusions, forming complex RE inclusions and leading to the decrease of inclusion size and the volume fraction of inclusions in Bearing Steel with RE addition. On the VHCF fracture of Bearing Steels with and without RE addition, both internal cracking mode and interface cracking mode exist at inclusions. Compared with Bearing Steel with RE addition, Bearing Steel without RE addition exhibits a longer crack initiation life due to stronger internal binding force of complex inclusions and interfacial binding force between complex inclusions and the matrix. However, smaller complex RE inclusions make crack propagation life of the former significantly longer than that of the latter. In addition, fine granular area (FGA) can be used to estimate the fatigue limit of different fatigue life in the VHCF regime and the fatigue limit at 109 cycles evaluated based on FGA indicates an error of around 2% with respect to the fatigue limit measured by staircase method.