转炉炼钢渣磷元素的富集及影响因素

为了研究炼钢过程中出现的低碳低磷钢冶炼困难以及转炉终点补吹回磷的现象,以转炉炼钢渣相为研究对象,利用扫描电镜测量分析了渣相的微观组成与C_2S(2CaO·SiO_2)富磷相在渣中的比例。研究结果表明,转炉脱磷由"氧化脱磷"+"固磷"两个环节组成;渣中SiO_2通过影响C_2S量的多少对脱磷产生影响,渣中FeO质量分数高,会分解C_2S相进而导致钢水回磷;温度高导致固磷相分解,研究结果表明,通过控制转炉终渣固磷相熔点高于钢水温度,可实现低温出钢。

Enrichment and influencing factors of phosphorus in slag of converter steelmaking

In order to research the problems of low phosphorus steel smelting and the phenomenon of increased phospho-rus in the steelmaking process,the slag phase of converter steelmaking was studied by SEM and the microstructure and the phase proportion of C2S(2CaO·SiO2)in slag were analyzed. The results shows that dephosphorization is composed of"oxi-dation dephosphorization"and"solid phosphorus". The influence factors of phosphorus accumulation in steel slag are ana-lyzed. SiO2 has an impact on dephosphorization by affecting C2S volume. High FeO content in slag will decompose the C2S2 phase and result in rephosphorization. The interaction of high temperature and FeO the solid phase will cause the de-composition of solid phosphorus. The melting point of solid phase of phosphorus can be controlled higherly than the mol-ten steel,and the significant result of low temperature tapping in traditional thermodynamics can be obtained.