Copper remoral from molten iron sccap by nitrogen plasma frame

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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.