炼钢 ›› 2023, Vol. 39 ›› Issue (4): 13-20.

• 铁水预处理 • 上一篇    下一篇

CaF2和Al2O3对KR脱硫剂性能的影响研究

鲍光达1,吴  婷1,熊晨光2,操瑞宏2,王海军1,王海川1   

  1. 1.安徽工业大学 冶金工程学院,安徽 马鞍山 243032;
    2.江西新余钢铁股份有限公司,江西 新余 338001
  • 出版日期:2023-08-05 发布日期:2023-07-25

Effect of CaF2 and Al2O3 on performance of KR desulfurizer

  • Online:2023-08-05 Published:2023-07-25

摘要: 为降低钢中有害杂质硫元素含量,KR脱硫法广泛应用于钢铁企业生产低硫钢,脱硫剂对脱硫效果影响尤为关键。基于单纯形格子法,综合FactSage 8.1热力学软件、半球点熔点仪、旋转黏度计、渣-金接触试验等,分析了CaO-Al2O3-SiO2-CaF2-MgO渣系组分对脱硫剂的液相线温度、硫容量、脱硫剂消耗量、熔化温度、黏度、脱硫率的影响规律。结果表明,脱硫剂液相线温度随CaO含量增加而增加,随CaF2含量增加而降低;脱硫剂硫容量随CaO含量增加而增加,随Al2O3和CaF2含量增加而降低;增加CaF2和Al2O3含量,当脱硫剂中SiO2含量低时,脱硫剂消耗量及熔化温度变化不大,而当SiO2含量高时,脱硫剂消耗量大幅增加,熔化温度明显降低;熔化温度为1 400~1 424 ℃、w(SiO2)=0~10 %、w(Al2O3)和w(CaF2)均为5 %~15 %、w(MgO)=6 %的脱硫剂,其脱硫效率明显优于企业现用脱硫剂,并且CaF2的综合脱硫能力较Al2O3强;结合脱硫剂高温黏度,综合脱硫效果以及后续扒渣工艺, 2号脱硫剂为KR脱硫的最佳选择。

关键词: KR脱硫剂, FactSage热力学计算, 熔化温度, 脱硫效率

Abstract: In order to reduce the content of harmful sulfur elements in steel, KR desulfurization method is widely used in steel enterprises to produce low sulfur steel, and the influence of desulfurizer on the desulfurization efficiency is especially critical. In this paper, the effect of components on liquidus temperature, sulfur capacity, desulfurizer consumption, melting point, viscosity and desulfurization rate of CaO-Al2O3-SiO2-CaF2-MgO slag system were analyzed, based on simplex lattice method, FactSage 8.1 thermodynamic software, hemispherical melting point meter, rotating viscometer and slag-metal experiment. It was concluded that, the liquidus temperature of desulfurizer increased with CaO addition, and decreased with CaF2 addition, while the sulfur capacity of desulfurizer increased with CaO and decreased with Al2O3 and CaF2 enhancement. Meanwhile, with CaF2 and Al2O3 addition, the desulfurizer consumption and melting point changed little in slag with low content of SiO2, while the consumption increased greatly and the melting point decreased obviously in slag with high content of SiO2. The desulfurization efficiency of desulfurizer with melting point of 1 400-1 424 ℃, w(SiO2) of 0-10 %, w(Al2O3) and w(CaF2) of 5 % -15 %, w(MgO) of 6 % was better than that of desulfurizer used in an enterprise, and the comprehensive desulfurization ability of CaF2was stronger than that of Al2O3. Combined with the high temperature viscosity, the desulfurization efficiency and the subsequent slagging-off process, No.2 desulfurizer was the best choice for KR desulfurization.

Key words: KR desulfurizer, FactSage thermodynamic calculation, melting temperature, desulfurization efficiency