炼钢 ›› 2019, Vol. 35 ›› Issue (6): 16-23.

• 转炉及电炉冶炼 • 上一篇    下一篇

工艺参数对低温低碱度条件下转炉脱磷效果的影响

叶格凡1,杨 健1,鲁欣武2,王 辉2,刘万善2,张润灏1,杨文魁1   

  1. (1.上海大学 材料科学与工程学院 省部共建高品质特殊钢冶金与制备国家重点实验室,上海 200444; 2.宁波钢铁有限公司,浙江 宁波 315000)
  • 接受日期:1900-01-01 出版日期:2019-12-05

Effects of operation parameters on dephosphorization results of BOF atlow temperature and low basicity

  • Accepted:1900-01-01 Online:2019-12-05

摘要: 通过180 t转炉双渣留渣工业试验,在高磷铁水条件下,研究了温度和渣中TFe的变化、尤其是较宽范围内碱度的变化对磷分配比LP、脱磷率以及倒渣时间的影响,并对脱磷渣进行了物相分析。研究结果表明,在较低温度1 345~1 420 ℃,当炉渣碱度在0.9~2.6变化时,随着碱度的提高,LP和脱磷率会随之上升,并且Ogawa经验公式LP的计算值合理地略高于实际值。当脱磷终点温度升高,LP和脱磷率随之降低;当脱磷渣中w(TFe)=11.30 %~19.42 %时,TFe变化对脱磷反应的影响不明显。脱磷渣主要由深灰色Ca3Mg(SiO4)2相、浅灰色CaFeSiO4相以及白色Ca2Fe2O5相组成。其中深灰色相P元素含量最高,是主要的富磷相。

关键词: 双渣留渣工艺, 脱磷, 碱度, 温度, 富磷相

Abstract: In this paper, the 180 t BOF industrial tests of double slag and remaining slag technology were carried outto study the effects of the temperature, TFe of dephosphorization slag and especially the basicities varied over a wide range on the phosphorus distribution ratio of LP, dephosphorization ratioand deslagging time under the condition of high phosphorus containing hot metal, and the phase compositions of dephosphorization slag were alsoanalyzed.The results show that when the basicity of slag varies from 0.9 to 2.6, the phosphorus distribution ratio of LP and dephosphorization ratio are increased with increasing basicity, and the calculated values of LPwith Ogawa empirical formula are slightly higher than the actual values with reasonable extents, when the temperature is relatively low in the range of 1345–1420℃. When the temperature of the dephosphorization end point is increased, the phosphorus distribution ratio LP and dephosphorization ratioare decreased. When the TFe in the dephosphorization slag is changed in the range of 11.30 %–19.42%, the effect of TFe change on the dephosphorization reaction is not obvious.The dephosphorization slag phase consists mainly of a dark gray phaseofCa3Mg(SiO4)2, a light gray phaseof CaFeSiO4, and awhitephaseof Ca2Fe2O5. Among them, P content is the highest in the dark gray phase, which is the mainphosphorus-rich phase.

Key words: double slag and remaining slag process, dephosphorization, basicity, temperature, phosphorus-rich phase