Comprehensive effect of Al2O3 content and binary basicity on the enrichment mechanism of phosphates in quenched steelmaking slags

被引：0
|
作者：
Li J.-Y. [1 ]
Zhang M. [1 ]
Guo M. [1 ]
Yang X.-M. [2 ]
机构：
[1] School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing
[2] Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing
来源：
Guo, Min (guomin@ustb.edu.cn) | 2016年 / Science Press卷 / 38期
关键词：
Alumina; Basicity; Enrichment; Phosphates; Steelmaking slags;
D O I：
10.13374/j.issn2095-9389.2016.05.011
中图分类号：
学科分类号：
摘要：
A comprehensive effect of Al2O3 content and binary basicity B on the enrichment behavior of phosphates in rapidly quenched CaO-SiO2-FeO-P2O5-Fe2O3-Al2O3 steelmaking slags was investigated through thermodynamic calculations and experimental determination. It is found that the determined mass percentage of P2O5 in the phosphate-enriched phase nC2S-C3P depends on the forming of free C2S in the steelmaking slags and increasing the SiO2 content can result in an obviously decreasing tendency of formed C2S. Adding Al2O3 as a dilute agent for decreasing the viscosity and melting point of the steelmaking slags can be easily bonded with free C2S to form a gehlenite (C2AS) solid solution. Thus, adding Al2O3 in the steelmaking slags can decrease the amount of free C2S in the steelmaking slags, which affects phosphate enrichment. In order to obtain a greater phosphate enrichment in the steelmaking slags, a coupling relationship between the binary basicity B and the mass percentage of Al2O3 in the initial steelmaking slags should be kept as (%Al2O3)=-27.70+21.62B under the conditions of (Al2O3)<20.0% and the binary basicity B>1.3. © All right reserved.
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页码：668 / 676
页数：8
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