Distribution Equilibria of Phosphorus and Sulfur between Liquid Iron and <Na_2> O Base Slags.

铁水与<Na_2>O基渣之间磷、硫的分布平衡。

• 批准号: 60550479
• 负责人: IWAI Hikoya
• 金额: $ 1.22万
• 依托单位: IRON AND STEEL TECHNICAL COLLEGE
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60550479/
• 关键词: Dephosphorization of Moten Steel; Desulfurization of Molten Steel; Phosphorus Distribution Ratio; Sulfur Distribution Ratio; Sの分配比; 溶鋼の取鍋精錬

1. IntroductionIn order to extend a market for steel materials, it is necessary to make steels high grade. Especially, the very low-phosphorus-steel and very low-sulfur-steel are strongly in demands. Desulfurization proceeds efficiently in the process of hot metal pretreatment, which has been fixed in every steel making plant, whereas dephosphorization is carried out in converter or ladle refining furnace. The ladle refining, in the stage of final steel making processes, is considered to be an advantageous process to obtain P+S<50ppm. In the present work, the possibility of the simultaneous dephosphorization-desulfurization by the <Na_2> O-based fluxes was investigated.2. ExperimentThe experiments were carried out in a Tammann furnace (static bath, Fe-P-S alloy/ <Na_2> O-CaO- <SiO_2> flux ratio = 30g/300g) and a high frequency induction furnace (stirring bath, ratio = 100g/1200g) in an atmosphere of Ar at 1600゜C. The obtained results were discussed from the thermodynamic point of view. The relationships among slag compositions ( <Na_2> O/ <SiO_2> , <Na_2> O/CaO ratios), oxygen potential of molten steels, degrees of dephosphorization and desulfurization, <C_P> and <C_S> were made clear. The stirring effect of molten steel was also discussed.3. Results(1) The <Na_2> O/ <SiO_2> ratio of final slags varied from 0.4 to 1.1. The degrees of dephosphorization and desulfurization increased with increasing in this ratio. (2) The <Na_2> O/CaO ratio of initial fluxes was set from 4 to 2. The degree of desulfurization decreased markedly, whereas that of dephosphorization was constant at a high lebel, with decreasing in this ratio. The ability of CaO to desulfurize molten steels was lower than that of <Na_2O> . The <Na_2O> -equivalence of CaO was determined to be 0.8 for dephosphorization and 0.3 for desulfurization. (3) By the stirring of molten steel, both of dephosphorization and desulfurization improved markedly.

1.为了扩大钢材市场，必须使钢材高等级化。特别是极低磷钢和极低硫钢的需求量很大。脱硫在铁水预处理过程中有效地进行，这已被各炼钢厂所固定，而脱磷则在转炉或钢包精炼炉中进行。在最终炼钢工艺阶段，钢包精炼被认为是获得P+S<50 ppm的有利工艺。研究了O基熔剂同时脱磷脱硫的可能性<Na_2>.实验在Tammann炉（静态浴，Fe-P-S合金/<Na_2>O-CaO-<SiO_2>熔剂比= 30 g/300 g）和高频感应炉（搅拌浴，比= 100 g/1200 g）中在1600 ℃的Ar气氛中进行。从热力学角度对所得结果进行了讨论。明确了炉渣成分（<Na_2>O/<SiO_2>、<Na_2>O/CaO比）与钢水氧势、脱磷、脱硫程度<C_P>之间的关系<C_S>。并对钢液搅拌效果进行了探讨.结果（1）终渣的<Na_2>O/<SiO_2>比值在0.4 ~ 1.1之间。随着此比例的增加，脱磷和脱硫的程度也增加。(2)初始<Na_2>熔剂的O/CaO比设定为4至2。随着脱硫率的降低，脱硫率明显降低，而脱磷率则保持在较高的水平。CaO对钢液的脱硫能力低于CaO<Na_2O>。CaO的<Na_2O>当量被确定为0.8用于脱磷和0.3用于脱硫。(3)通过对钢液的搅拌，脱磷和脱硫效果均得到明显改善。

项目成果

Hikoya IWAI and Kyoji KUNISADA: "Desulfurization and Simultaneous Desulfurization-Dephosphorization of Liquid Iron by <Na_2> O-Si <O_2> Fluxes." Tetsu-to-Hagane. 72. S948 (1986)

Hikoya IWAI 和 Kyoji KUNISADA：“<Na_2> O-Si <O_2> 助熔剂对铁水进行脱硫和同时脱硫-脱磷”。

岩井彦哉,国定京治: 鉄と鋼. (1987)

岩井彦也、国定敬二：铁与羽金 (1987)。

岩井彦哉,国定京治: 鉄と鋼(日本鉄鋼協会誌). 12Vol.72 No.S.948 (1986)

Hikoya Iwai，Keiji Kunisada：钢铁（日本钢铁协会杂志）12Vol.72 No.S.948（1986）。

Hikoya IWAI and Kyoji KUNISADA: "Simultaneous Desulfurization-Dephosphorization of Molten Steel in Stirring Bath." Tetsu-to-Hagane. 73. (1987)

Hikoya IWAI 和 Kyoji KUNISADA：“搅拌槽钢水同步脱硫脱磷”。