Abstract A novel method was used to prepare metallic magnesium through a coupled electro-thermal field at 10 Pa pressure by using calcined dolomite and ferrosilicon as raw materials. This approach effectively reduced the reaction device temperature typically needed to extract magnesium through conventional methods. Three independent variables, i.e., reaction time, direct current (DC) electric field intensity (correspond device temperature), and current density were investigated in terms of the extent of reduction (reduction ratio) of magnesium oxide (MgO). The results illustrate that the reduction ratio of MgO increased significantly by extending reaction time, reducing DC electric field intensity (correspond to increasing device temperature), and increasing current density. For decreasing the furnace device temperatures, higher intensities of DC electric fields were needed. When applying a DC electric field intensity of 950 V/cm, the reduction ratio of up to 88.35% was obtained under current density of 1.18 A/cm2 for 150 min at 700 °C of device temperature. The X-ray diffraction and electronic probe micro-analyzer analyses showed that the purity of metallic magnesium obtained through the proposed method was 98.54 wt%. It was found that the magnesium reduction mechanism of the coupled field method could be explained by the Joule heating effect.

中文翻译：

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通过耦合电场和热场生产镁

摘要 以煅烧白云石和硅铁为原料，采用10 Pa压力耦合电热场制备金属镁的新方法。这种方法有效地降低了通过常规方法提取镁通常所需的反应装置温度。就氧化镁(MgO)的还原程度(还原率)而言，研究了三个自变量，即反应时间、直流(DC)电场强度(对应的器件温度)和电流密度。结果表明，通过延长反应时间、降低直流电场强度（对应于增加器件温度）和增加电流密度，MgO 的还原率显着增加。为了降低炉装置温度，需要更高强度的直流电场。当施加 950 V/cm 的直流电场强度时，在 700 °C 的器件温度下，在 1.18 A/cm2 的电流密度下持续 150 分钟，可获得高达 88.35% 的还原率。X射线衍射和电子探针微量分析仪分析表明，通过该方法获得的金属镁纯度为98.54 wt%。发现耦合场法的镁还原机制可以用焦耳热效应来解释。X射线衍射和电子探针微量分析仪分析表明，通过该方法获得的金属镁纯度为98.54 wt%。发现耦合场法的镁还原机制可以用焦耳热效应来解释。X射线衍射和电子探针微量分析仪分析表明，通过该方法获得的金属镁纯度为98.54 wt%。发现耦合场法的镁还原机制可以用焦耳热效应来解释。