Cyanide, among with NO _x , CO₂, and CO, is one of the adverse compounds that form in the ironmaking and steelmaking industry. High-temperature processes are suitable environments for cyanide formation, and cyanide can form as a result of recombination in electric arc plasma. Even though the cyanides might not survive e.g. the post-combustion process, understanding the formation mechanisms of hazardous materials in the steelmaking industry is important. In this work, the recombination of cyanide in a pilot-scale AC electric arc furnace is studied with optical emissions from the CN molecule. The results show how the optical emissions from the cyanide change in different process steps. Electric input, plasma temperature, and interaction of the arc with solid charge material were observed to have an impact on the CN signal. Additionally, equilibrium composition computation highlights how different sources of carbon change the recombination rate and that the highest recombination occurs at 6821 K.

氰化物，其中包括NO _x、CO ₂ 和 CO 是炼铁和炼钢工业中形成的有害化合物之一。高温工艺是氰化物形成的合适环境，并且由于电弧等离子体中的复合而形成氰化物。尽管氰化物可能无法在后燃烧过程中存活，但了解炼钢行业中有害物质的形成机制很重要。在这项工作中，研究了氰化物在中试规模的交流电弧炉中的重组，以及 CN 分子的光发射。结果显示了氰化物的光发射如何在不同的工艺步骤中发生变化。观察到电输入、等离子体温度以及电弧与固体电荷材料的相互作用对 CN 信号有影响。此外，