不锈钢风淬渣非平衡凝固晶相偏离评价
Evaluation of crystal phase deviation in non-equilibrium solidification of air-quenched slag of stainless steel
岳昇 1赵俊学 1曹赓 1樊君 2李彬1
作者信息
- 1. 西安建筑科技大学冶金工程学院,陕西西安 710055
- 2. 中冶东方集团有限公司,山东青岛 266000
- 折叠
摘要
不锈钢渣的风淬法处理是一种快速的非平衡冷却凝固过程.为了探究不锈钢风淬渣的结晶行为,通过Factsage计算钢渣平衡凝固过程,利用X射线衍射法分析AOD炉不锈钢风淬渣的主要矿物组成,采用扫描电子显微镜观察了其各自的微观形貌和分布.结果表明,随着钢渣颗粒粒径由大于4 mm减小到大于0.5 mm,结晶物相面积占比由36.28％降低到24.88％.同时,快速冷却会使平衡态下不稳定的Ca3SiO5分解受到抑制而使其保留下来.此外快速冷却会抑制晶体形核、生长,影响结晶度,玻璃体比例增大进而提高炉渣胶凝活性.通过控制风淬时气体流速(冷却速度)可以控制钢渣物相组成,改变钢渣的胶凝活性,改善钢渣的利用率.
Abstract
The treatment of stainless steel slag by air quenching is a rapid non-equilibrium cooling and solidification process.To investigate the crystallization behavior of air-quenched slag in stainless steel,the equilibrium solidification process of steel slag was calculated by Factsage,and the main mineral composition of air-quenched slag from AOD furnace was analyzed by X-ray diffraction,microscopic morphology and distribution of each component were observed via scanning electron microscopy.The results show that when the particle size of steel slag decreased from larger than 4 mm to larger than 0.5 mm,the crystalline material area fell from 36.28％to 24.88％.Meanwhile,rapid cooling will suppress the decomposition of unstable Ca3SiO5 in equilibrium state and retain it.In addition,rapid cooling can inhibit crystal nucleation and growth,affect crystallinity,and increase the proportion of vitreous,thereby improving the cementitious activity of slag.By controlling the gas flow rate(cooling rate)during air quenching,the phase composition of steel slag can be controlled,the cementitious activity of steel slag can be changed,and the utilization rate of steel slag can be improved.
关键词
不锈钢渣/风淬法/非平衡冷却/结晶度Key words
stainless steel slag/air quenching/non-equilibrium cooling/crystallinity引用本文复制引用
基金项目
国家自然科学基金资助项目(51674185)
出版年
2024
NETL
NSTL
万方数据