The Fifth Taiwan -Japan-Workshop on Mechanical and Aerospace Engineering
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和文:
英文:
Nantou, Taiwan
アブストラクト
Due to the massive fossil fuel consumption, the increasing CO2 concentration seriously brings about the global warming. The decomposition of metal oxide to metal and oxygen is an attractive process for energy storage. We succeeded in dissociating magnesium oxide by using continuous wave (cw) CO2 laser radiation. Starting from magnesium oxide, magnesium was produced by laser-induced vaporization. The ablated vapor temperature was measured approximately 5000 k, where the MgO was dissociated to Mg and O atom thermally. A copper plate was placed to collect the high-temperature vapors, accumulating Mg as solid deposit. Unfortunately, the gaseous products reacts together to reform MgO when temperature is lowered. As vapors cool, it is necessary to quench the gaseous products fast enough to avoid recombination. The reducing agents, Zr, Si and C and Ar gases were employed to prevent magnesium re-combination with Oxygen. In these experiments, the reduction efficiency dependence on the carbon mole ratio (MgO:C=1:0-3) was measured when carbon was used as a reducing agent. The results show the reduction efficiency improves with increasing carbon molar ratio, which reachs the maximum at 54 wt% when the ratio of MgO:C is 1:2. This ratio is lower than 1:3 (MgO:C) in industrial process of Carbothermic (Reduction efficiency is 53 wt%). Consequently, utilizing the solar pumped laser in Mg production will reduce the carbon oxide emission efficiently.
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