In this work, the static magnetic field was applied to plasma arc melting (PAM) method. The influence on sulfur removal from iron by Ar-20%H₂ (PAM) was investigated experimentally. The results show that, sulfur content decreases more noticeably with the magnet field. The mechanism of sulfur removal by hydrogen plasma arc melting (HPAM) was found to obey a first-order rate law. From kinetic analysis, the adoption of magnet field enhanced purification efficiency about 45% under the same conditions. The numerical simulations were necessarily carried out to investigate the fluid flows of the melt. The results show that the magnet field changes the flow regime and strengthens the flow velocity of the melt. Moreover, the dead zone in melt by typical HPAM was eliminated. It is reasonable that dissolved sulfur atoms transferring to the top interface to react with active hydrogen atoms was promoted. In addition, during solidification process, thermoelectric magnetic (TEM) flows promote solute atoms that discharged from the solid–liquid interface moving to the upside of specimen. As a consequence, iron with much lower sulfur content could be obtained at the bottom of specimens, and sulfur removal was enhanced further during solidification under a static magnetic field.

中文翻译：

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磁场对氢等离子弧熔炼铁液脱硫的影响

在这项工作中，静磁场应用于等离子弧熔化 (PAM) 方法。_{Ar-20%H 2}对铁除硫的影响(PAM) 进行了实验研究。结果表明，硫含量随着磁场的增加而降低得更加明显。发现氢等离子弧熔化 (HPAM) 脱硫机理遵循一级速率定律。从动力学分析来看，在相同条件下，磁场的采用使净化效率提高了45%左右。必须进行数值模拟来研究熔体的流体流动。结果表明，磁场改变了流动状态，增强了熔体的流动速度。此外，消除了典型 HPAM 在熔体中的死区。促进溶解的硫原子转移到顶部界面与活性氢原子反应是合理的。此外，在凝固过程中，热电磁 (TEM) 流促进从固液界面排出的溶质原子向试样上方移动。结果，可以在试样底部获得硫含量低得多的铁，并且在静磁场下凝固过程中进一步增强了硫的去除。