Abstract: The relative studies on evaporation of fluorides in quad- and pent-ingredient slag series during electroslag remelting process are concluded and summarized. The thermodynamic analysis on volatile reaction of fluorides has been carried out by activity calculation model of slag components to get order of evaporation of fluorides in different basicity slag. Results show that as basicity of slag is between 3. 74 and 0. 84, the order of evaporative capacity of fluorides is MgF₂ > AF₃; SiF₄ > AlOF. As the temperature is more than 1 200℃, the slag containing fluoride especially containing higher and high fluoride exist obvious weight loss phenomenon. For slag ANF-6 (/%: 30A1₂0₃,7OCaF₂) at 1 400 ℃, in 100 g slag sample the evaporation rate of fluorides is up to 0. 68 g/min, and the evaporation of A1F₃ and SiF₄ should be the main reason for weight loss of slag.

摘要： 对电渣重熔过程4元渣系和5元渣系氟化物挥发相关研究进行归纳和总结,通过渣成分活度计算模型对氟化物挥发反应进行了热力学分析,给出了不同碱度炉渣的挥发物挥发程度排序。结果表明,碱度在3.74～0.84,氟化物的挥发能力次序为MgF₂>AlF₃>SiF₄>AlOF。1200℃以上时,含氟化物炉渣尤其中高氟炉渣存在明显的失重现象。对ANF-6渣(/%:30Al₂O₃、70CaF₂),1400℃时,100 g渣样中氟化物的挥发速率可达到0.68g/min,AlF₃、SiF₄挥发应作为失重的主要原因。

关键词: 电渣重熔, 氟化物挥发, 炉渣成分变化