Copper remoral from molten iron sccap by nitrogen plasma frame

通过氮气等离子框架从铁水短流中去除铜

• 批准号: 09450279
• 负责人: SUZUKI Ryosuke,o.
• 金额: $ 7.55万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450279/
• 关键词: Copper removal; Nitrogen Plasma; Refining; Molten steel; Arc Plasma; Plasma Frame; ammonia; 水素プラズマ; プラズマ; アーク

In this research, the addition of NィイD22ィエD2 was studied because nitrogen in the frame may promote copper removal in analogy to NHィイD23ィエD2 decuprization. Two types of plasma, TIG-arc and plasma-arc, were selected. The temperature of molten iron under plasma arc was measured to clarify the refining mechanism.Copper concentration in iron decreased as the melting time increased, whether NィイD22ィエD2 was added or not. Ar-HィイD22ィエD2 plasma could decrease copper concentration than Ar-NィイD22ィエD2-HィイD22ィエD2 plasma could. Two kinds of morphology for the particles were obtained in the dust after plasma melting. A measuring method at the surface temperature molten iron was developed to avoid the interference from plasma frame, and to reveal temperature distribution of molten iron's surface.The relationship between Cu concentration in dust and that in the bulk was calculated assuming that the mechanism of copper removal is simple evaporation as Cu gas. Comparing with the experiment the melting under plasma arc could remove copper to a level lower than that by the vacuum free evaporation. Some other factors were discussed in the mechanism of copper removal from molten iron.

在本研究中，研究了添加NH 4-D22-NH 4-D2，因为框架中的氮可以促进铜的去除，类似于NH 4-D23-NH 4-D2的脱粗。两种类型的等离子体，TIG电弧和等离子体电弧，被选择。通过对等离子弧下铁水温度的测定，阐明了等离子弧精炼的机理，结果表明，无论是否加入N_（22）O_ Ar-H_（22）D_2等离子体比Ar-N_（22）D_2-H_（22）D_2等离子体能降低铜离子浓度。等离子体熔化后的粉尘中的颗粒得到两种形态。为了避免等离子体框架的干扰，揭示铁水表面温度分布，提出了一种铁水表面温度测量方法，并在铜的去除机理为铜气体蒸发的假设下，计算了粉尘中铜浓度与本体中铜浓度的关系。与实验结果相比，等离子弧熔炼的铜去除率低于真空蒸发。对影响铁液除铜机理的其它因素进行了讨论。