LF精炼渣的物相及其冷却过程研究

炼钢 ›› 2014, Vol. 30 ›› Issue (6): 50-53.

LF精炼渣的物相及其冷却过程研究

(1. 北京科技大学钢铁冶金新技术国家重点试验室，北京 100083； 2. 中钢集团武汉安全环保研究院，湖北武汉 430081；3. 北京科技大学冶金工程研究院，北京 100083)

接受日期:1900-01-01 出版日期:2014-12-05

Study on the phase and cooling process of LF refining slag

Accepted:1900-01-01 Online:2014-12-05

摘要/Abstract

摘要： 利用X射线荧光光谱仪、X射线衍射仪、扫描电镜和能谱分析仪对某厂260 t LF精炼渣的物相组成及其形貌特征进行研究，并用热力学软件FactSage对其冷却过程中物相的析出情况进行研究。结果表明：LF精炼渣的主要物相组成为钙铝相和钙硅相，还含有少量的Ca(OH)2和MgO。钙铝相根据是否含硫而呈现出不同的显微形貌特征；钙硅相则多呈圆形或不规则椭圆形，且物相表面为颗粒堆积状态；而MgO相为无定形状，多分布在钙硅相周围。LF精炼渣在缓慢冷却的过程中，最终会析出固溶有MgO的钙铝酸盐相(Ca3MgAl4O10)、CaO、少量的Ca2(Al,Fe)2O5以及γ-C2S等物相，且各物相的析出温度分别为1 280，1 100，1 100， 850 ℃。

关键词: LF精炼渣, 物相组成, 显微结构, 冷却过程

Abstract: X-ray fluorescence、X-ray diffraction、SEM and EDS were used to study the phase composition and microstructure of the 260 t ladle furnace refining slag of a steel mill, and the thermodynamic software FactSage was used to study the precipitation process of each precipitated phase in the cooling process of the LF refining slag.The results indicate that the main phases of the LF refining slag are calcium aluminum phase and calcium silicon phase, and also a small amount of Ca(OH)2 and MgO. Calcium aluminum phase appears as different shapes based on whether it contents sulphur or not; calcium silicon phase mainly appears as round or irregular oval shape, and in accumulation state; free MgO phase has irregular shape, mainly distributed around the calcium silicon phase. In the slow cooling process of the LF refining slag, the final precipitated phases are calcium aluminate contenting MgO(Ca3MgAl4O10),CaO,a small amount of Ca2(Al,Fe)2O5 and γ-C2S, and the precipitating temperatures of each phase are respectively 1 280 ℃,1 100 ℃,1 100 ℃ and 850 ℃.

Key words: LF refining slag, phase composition, microstructure, cooling process

吴启帆1，包燕平1，林路1，徐国平2,程慧高2，黄毅2，辛彩萍3. LF精炼渣的物相及其冷却过程研究[J]. 炼钢, 2014, 30(6): 50-53.

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