(1. 中南大学 冶金与环境学院，长沙 410083；
2. 中南大学 中国有色金属工业清洁冶金工程研究中心，长沙 410083)
摘 要: 富氧熔炼过程中SO3(g)的形成是设备腐蚀及污酸形成的主要原因。通过模拟计算，研究温度、O2(g)和H2O(g)含量以及硫酸盐的存在这4种因素对烟气中SO3(g)、H2SO4(l)等含硫组分形成的影响。结果表明：温度越高，越不利于SO3(g)、H2SO4(l)的形成；烟气中O2(g)和H2O(g)的量越低，SO3(g)和H2SO4(l)含量也越低，这是控制烟气酸性物质生成的决定性因素；物料中硫酸盐属于不利因素，在一定温度范围内分解生成SO3(g)和O2(g)，导致SO3(g)发生率增大。分析认为，精确控制烟道漏风量，尽可能减少物料水分和硫酸盐含量，并延长物料在炉内停留时间，可抑制烟气中SO3(g)、H2SO4(l)的形成，对解决熔炼过程设备腐蚀及污酸问题有一定意义。
关键字: 富氧熔炼；烟气；SO3(g)；SO2(g)；形成；抑制
（1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. Cleaner Metallurgical Engineering Research Center, Nonferrous Metal Industry of China, Central South University, Changsha 410083, China）
Abstract:In oxygen-enriched smelting process, the problems of equipment corrosion and waste acid formation are closely related to the formation of SO3(g). By simulating calculation, the influences of temperature, the amount of O2(g) and H2O(g), sulphates existing on the component content of SO3(g), SO2(g) and H2SO4(l) of flue gas were studied. The results show that, the high temperature goes against the formation of SO3(g) and H2SO4(l). The higher the temperature, the less the content of SO3(g) and H2SO4(l). The less the amount of O2(g) and H2O(g), the less the content of SO3(g) and H2SO4(l). The amount of O2(g) and H2O(g) are the decisive factor to generate SO3(g) and H2SO4(l). Sulphates existing is an unfavorable factor for equipment corrosion and waste acid formation. The sulphates decompose and lead to the content of SO3(g) and O2(g) increasing at some temperature. The analysis results suggest that accuracy control of the air-leakage rates of feed opening and flue, reducing the water and sulphates content as much as possible, and prolonging the residence time in the furnace of raw materials can all inhibit the formation of SO3(g) and H2SO4(l), and has certain significance on solving the problems of equipment corrosion and waste acid formation.
Key words: oxygen-enriched smelting; flue gas; SO3(g); SO2(g); formation; inhibition
