改质钢渣中铁/磷富集相形核与长大行为研究

李军成; 李果轩; 邱锋; 王蓉; 梁金山; 钟艺; 管东; 李京伟; Seetharaman Sridhar; Zushu Li

doi:10.1007/s12613-022-2553-x

Volume 30 Issue 2

Feb. 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(2): 378-387

Juncheng Li, Guoxuan Li, Feng Qiu, Rong Wang, Jinshan Liang, Yi Zhong, Dong Guan, Jingwei Li, Seetharaman Sridhar, and Zushu Li, Nucleation and growth control for iron- and phosphorus-rich phases from a modified steelmaking waste slag, Int. J. Miner. Metall. Mater., 30(2023), No. 2, pp. 378-387. https://doi.org/10.1007/s12613-022-2553-x

Cite this article as:

Juncheng Li, Guoxuan Li, Feng Qiu, Rong Wang, Jinshan Liang, Yi Zhong, Dong Guan, Jingwei Li, Seetharaman Sridhar, and Zushu Li, Nucleation and growth control for iron- and phosphorus-rich phases from a modified steelmaking waste slag, Int. J. Miner. Metall. Mater., 30(2023), No. 2, pp. 378-387. https://doi.org/10.1007/s12613-022-2553-x

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研究论文

改质钢渣中铁/磷富集相形核与长大行为研究

1)
江苏大学材料科学与工程学院，镇江 212013，中国
2)
合肥工业大学材料科学与工程学院，合肥 230009，中国
3)
Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287, USA
4)
WMG, the University of Warwick, Coventry, CV4 7AL, UK

通讯作者:
李军成 E-mail: leejc2011@163.com

文章亮点

(1) 在线观测熔融改质钢渣(CaO–SiO₂–FeO–P₂O₅–B₂O₃)的结晶行为。

(2) 理论计算Fe₃O₄与Ca₁₀P₆O₂₅晶体的形核和长大速率。

(3) 总结并提出改质钢渣中Fe₃O₄与Ca₁₀P₆O₂₅晶体选择性结晶长大的最佳温度区间。

中文摘要

回收钢渣中的铁（Fe）和磷（P），不仅可以减轻钢渣堆积带来的环境负担，而且是钢铁工业发展循环经济、实现可持续发展的必由之路。本文旨在通过研究B₂O₃改质钢渣中富铁相（Fe₃O₄）和富磷相（Ca₁₀P₆O₂₅）的结晶动力学规律确定Fe₃O₄与Ca₁₀P₆O₂₅晶体可控生长的温度制度。本研究采用高温激光共聚焦扫描显微镜（CLSM）在线观测CaO–SiO₂–FeO–P₂O₅–B₂O₃熔体的结晶行为，使用经典的结晶动力学理论计算Fe₃O₄与Ca₁₀P₆O₂₅晶体的形核和长大速率。研究结果表明，CaO–SiO₂–FeO–P₂O₅–B₂O₃熔体在冷却过程中初晶相Fe₃O₄析出温度范围为1300–1150°C，棒状的第二相Ca₁₀P₆O₂₅在1150–1000°C温度区间内析出，且Fe₃O₄相的结晶能力大于Ca₁₀P₆O₂₅相。综合考虑Fe₃O₄相与Ca₁₀P₆O₂₅相的形核与长大速率，最终确定两相选择性结晶长大的最佳温度区间为(1055 ± 25)°C，即在1080–1030°C温度范围内对CaO–SiO₂–FeO–P₂O₅–B₂O₃熔体进行缓慢冷却有利于Fe₃O₄与Ca₁₀P₆O₂₅晶体的结晶长大，从而为后续从渣中选择性分离Fe₃O₄相与Ca₁₀P₆O₂₅相创造了必要条件。

关键词:

钢渣;
磁铁矿;
磷酸钙;
形核;
长大;
动力学

Research Article

Nucleation and growth control for iron- and phosphorus-rich phases from a modified steelmaking waste slag

+ Author Affiliations

Abstract

Abstract

Recovering the iron (Fe) and phosphorus (P) contained in steelmaking slags not only reduces the environmental burden caused by the accumulated slag, but also is the way to develop a circular economy and achieve sustainable development in the steel industry. We had previously found the possibility of recovering Fe and P resources, i.e., magnetite (Fe₃O₄) and calcium phosphate (Ca₁₀P₆O₂₅), contained in steelmaking slags by adjusting oxygen partial pressure and adding modifier B₂O₃. As a fundamental study for efficiently recovering Fe and P from steelmaking slag, in this study, the crystallization behavior of the CaO–SiO₂–FeO–P₂O₅–B₂O₃ melt has been observed in situ, using a confocal scanning laser microscope (CLSM). The kinetics of nucleation and growth of Fe- and P-rich phases have been calculated using a classical crystallization kinetic theory. During cooling, a Fe₃O₄ phase with faceted morphology was observed as the 1st precipitated phase in the isothermal interval of 1300–1150°C, while Ca₁₀P₆O₂₅, with rod-shaped morphology, was found to be the 2nd phase to precipitate in the interval of 1150–1000°C. The crystallization abilities of Fe₃O₄ and Ca₁₀P₆O₂₅ phases in the CaO–SiO₂–FeO–P₂O₅–B₂O₃ melt were quantified with the index of (T_U − T_I)/T_I (where T_I represents the peak temperature of the nucleation rate and T_U stands for that of growth rate), and the crystallization ability of Fe₃O₄ was found to be larger than that of Ca₁₀P₆O₂₅ phase. The range of crystallization temperature for Fe₃O₄ and Ca₁₀P₆O₂₅ phases was optimized subsequently. The Fe₃O₄ and Ca₁₀P₆O₂₅ phases are the potential sources for ferrous feedstock and phosphate fertilizer, respectively.
- steelmaking slag;
- magnetite;
- calcium phosphate;
- nucleation;
- growth;
- kinetics

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