论文部分内容阅读
针对LF精炼钢氮含量偏高的问题,对冶炼各工序进行了取样分析,发现LF精炼造渣阶段为主要的增氮环节。通过实际取样检测和热力学分析,证实造渣阶段的增氮主要是由铝灰中的Al N引起的。使用Al2O3含量较高、氮含量较低的人工合成渣替代铝灰,使铝灰的使用量由2.6 kg/t降低至0.6 kg/t,通过对一个浇次7炉试验钢的LF出站氮含量进行检测,平均氮质量分数由改进前的76×10-6下降到44×10-6,在不影响精炼效果的同时抑制了原辅料引起的钢液增氮。
Aiming at the problem of high nitrogen content in LF refining steel, sampling and analysis of each process of smelting were carried out. It was found that LF refining and slagging phase was the main nitrogen addition. Through the actual sampling and thermodynamic analysis, it is confirmed that the increase of nitrogen in slagging stage is mainly caused by Al N in aluminum ash. The use of synthetic slag with higher Al2O3 content and lower nitrogen content instead of aluminum dust reduced the use of aluminum ash from 2.6 kg / t to 0.6 kg / t by passing LF out standing nitrogen The average nitrogen content decreased from 76 × 10-6 before improvement to 44 × 10-6, which did not affect the refining effect and inhibited the nitrogen addition caused by raw materials.