B2O3-Na2O系调渣剂对钒钛铁水脱硫渣性能的影响

 为解决含钒钛铁水脱硫扒渣过程中炉渣黏稠、铁损大及后续回硫多等问题,运用FactSage热力学软件,结合高温试验,探究了B₂O₃+Na₂O系调渣剂对钒钛铁水脱硫渣回硫、熔点及黏度的影响。结果表明,随着B₂O₃和Na₂O加入,铁水脱硫渣熔点及黏度显著降低;调渣剂中添加CaO有助于抑制回硫。并提出了改善铁水脱硫渣性能的调渣剂配方(质量分数),即CaO 45%～55%、SiO₂ 10%～15%、Al₂O₃ 5%～8%、B₂O₃ 15%～20%、Na₂O 5%～10%。调渣剂添加量为脱硫渣渣量的5%～10%时,能有效降低脱硫渣熔点和黏度,减少回硫。

Effect of B2O3-Na2O slag modifier on desulfurization slag performance of hot metal containing vanadium and titanium

In order to solve the problems of thick of slag, large of iron loss, and much of resulfurization in the slagging-off process after pre-desulfurization of hot metal containing vanadium and titanium, the effect of B₂O₃-Na₂O slag modifier on resulfurization, melting point, and viscosity of the desulfurization slag was investigated by using FactSage thermodynamic software and combing with high-temperature experiments. The results showed that the melting point and viscosity of the desulfurization slag decreased significantly with the addition of B₂O₃ and Na₂O. And the addition of CaO to the slag modifier helped to reduce resulfurization. The formula of slag modifier (45%-55% of CaO, 10%-12% of SiO₂, 5%-8% of Al₂O₃, 15%-20% of B₂O₃, and 5%-10% of Na₂O) to improve the performance of desulfurization slag was presented. It effectively reduced the melting point and viscosity of desulfurization slag and decreased the resulfurization, when the added amount of the slag modifier was 5%-10% of the desulfurization slag.