Novel Approach for the Reduction of ZnO and MgO Using a Direct Diode-Laser
Novel Approach for the Reduction of ZnO and MgO Using a Direct Diode-Laser
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使用直接二极管激光还原 ZnO 和 MgO 的新方法
DOI：
10.1007/s11663-016-0806-7
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
E. Iida
中科院分区：
文献类型：
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作者：
M. Mahmoud;T. Yabe;E. Iida
在本工作中，我们提出了使用能量密度为6.6 × 10 ~（11）W/m ~ 3的半导体激光器在真空中将ZnO还原为Zn作为第一步的结果。随后，我们使用半导体激光器使用Zn作为还原剂还原MgO。虽然Zn是可再生能源循环的候选者之一，但将其用作可回收的还原剂更有利。在此，还原效率以每摩尔烧蚀的ZnO或MgO获得的Zn或Mg的摩尔数来测量。能量效率以二极管激光器消耗的每能量产生的Zn或Mg的质量来测量。对于第一部分，最大的减少率为15.8 mg/s，相应的减少和能量效率分别为76.6%和16.14 mg/kJ。该工艺的产率为理论计算值的8.8%，仅优于太阳能ZnO还原工艺。对于第二部分，MgO与Zn的还原是可以实现的半导体激光器，生成的Mg与Zn的痕迹，和电子探针显微分析结果表明，MgO的还原效率波动在14.4和26.6%之间。对反应机理提出了不同的设想。
In this work, we present the results of using the diode laser with an energy density of 6.6 × 1011W/m3for reducing ZnO to Zn in vacuum as a first step. Subsequently, we use the diode laser for the reduction of MgO using Zn as the reducing agent. Although Zn is one of the candidates proposed for the renewable energy cycle, it is more auspicious to use it as a recyclable reducing agent. Herein, the reduction efficiency was measured in terms of moles of Zn or Mg obtained per moles of ZnO or MgO ablated. The energy efficiency is measured in terms of mass of Zn or Mg produced per energy consumed by diode laser. For the first part, the largest reduction rate was 15.8 mg/s, corresponding to reduction and energy efficiencies of 76.6 pct and 16.14 mg/kJ, respectively. The yield for the process was 8.8 pct of the theoretically calculated one, which is only better than the solar ZnO reduction process. For the second part, the reduction of MgO with Zn was attainable by diode laser, the resultant Mg was associated with Zn traces, and the electron probe micro analysis results showed that the MgO reduction efficiency fluctuates between 14.4 and 26.6 pct. Different scenarios were suggested for the mechanism of the reaction.