Thermophysical properties and structural characterization of high-Al2O3 aluminosilicate slag melts: Effect of Al2O3 addition methods

被引：1
作者：
Zhang, Shuo [1 ,2 ]
Hou, Yong [1 ,2 ]
Guo, Jia [1 ,2 ]
Zhou, Hanghang [1 ,2 ]
Lv, Xuewei [1 ,2 ]
机构：
[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China
[2] Chongqing Univ, Chongqing Key Lab Vanadium Titanium Met & New Mat, Chongqing 400044, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2025年 / 51卷 / 14期
基金：
中国国家自然科学基金;
关键词：
High-alumina slag; Viscosity; Electrical conductivity; Structure; BLAST-FURNACE SLAG; MGO/AL2O3; RATIO; ELECTRICAL CONDUCTIVITIES; VISCOSITY MODEL; BEHAVIOR; MGO; CAO/SIO2; NA2O;
D O I：
10.1016/j.ceramint.2025.02.042
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
This study proposed two methods for regulating the CaO-MgO-SiO2-Al2O3 slag composition: substituting Al2O3 for SiO2 and increasing the Al2O3 content alone. It investigated the changes in thermophysical properties and structure, with the aim of applying high-alumina iron ore in non-blast furnace process. XPS and 27Al MAS-NMR spectroscopy showed that as Al2O3 content increased under both methods, CaO was consumed and AlO4 tetrahedra progressively formed, resulting in an increased bridging oxygen and a decreased free oxygen and nonbridging oxygen in the slag. Simultaneously, the contents of Q3(Al) and Q4(Al) units with highly coordinated bridging oxygens gradually increased, while that of Q2(Al) unit decreased. This caused an increase in slag's polymerization degree, leading to higher viscosity and lower electrical conductivity. However, the increase in weak Al-O bonds caused the viscosity to decrease when Al2O3 initially replaced SiO2. A comprehensive comparison showed that substituting Al2O3 for SiO2 is more suitable for smelting.
引用
收藏
页码：18617 / 18629
页数：13
相关论文
共 40 条
[1]   A General Viscosity Model for Molten Blast Furnace Slag [J].
Gan, Lei ;
Lai, Chaobin .
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE, 2014, 45 (03) :875-888
[2]   Effects of basicity and MgO content on the viscosity of the SiO2-CaO-MgO-9wt%Al2O3 slag system [J].
Gao, Yun-ming ;
Wang, Shao-bo ;
Hong, Chuan ;
Ma, Xiu-juan ;
Yang, Fu .
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS, 2014, 21 (04) :353-362
[3]   Modification of interface chemistry and slag structure by transition element Cr [J].
He, Xiaobo ;
Wang, Lijun ;
Chou, Kuochih .
CERAMICS INTERNATIONAL, 2021, 47 (09) :12476-12482
[4]   Viscosity and structure relationship with equimolar substitution of CaO with MgO in the CaO-MgO-Al2O3-SiO2 slag melts [J].
Hou, Yong ;
Zhang, Shuo ;
Dang, Jie ;
Guo, Jia ;
Zhou, Hanghang ;
Lu, Xuewei .
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS, 2025, 32 (01) :70-79
[5]   Electrical Conductivity and Structure of CaO-MgO-SiO2-Al2O3-BaO Slag with Different BaO/Al2O3 Molar Ratios [J].
Hou, Yong ;
Zhang, Shuo ;
Dang, Jie ;
You, Zhixiong ;
Lv, Xuewei .
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE, 2024, 55 (05) :3201-3207
[6]   Effect of MgO/Al2O3 ratio on the structure and properties of blast furnace slags: A molecular dynamics simulation [J].
Jiang, Chunhe ;
Li, Kejiang ;
Zhang, Jianliang ;
Qin, Qinghua ;
Liu, Zhengjian ;
Sun, Minmin ;
Wang, Ziming ;
Liang, Wang .
JOURNAL OF NON-CRYSTALLINE SOLIDS, 2018, 502 :76-82
[7]   Effect of MgO/Al2O3 Ratio on Viscosity of Blast Furnace Primary Slag [J].
Jiao, Kexin ;
Zhang, Jianliang ;
Liu, Zhengjian ;
Chen, Chunlin .
HIGH TEMPERATURE MATERIALS AND PROCESSES, 2019, 38 (2019) :354-361
[8]   Molecular Dynamics Analysis of the Structural Behavior of Aluminum Ion in the Slag of CaO-SiO2-Al2O3-Li2O System [J].
Jiao, Shiyan ;
Guo, Peiyao ;
Chen, Feichi ;
Min, Yi ;
Liu, Chengjun .
STEEL RESEARCH INTERNATIONAL, 2024, 95 (01)
[9]   Effect of Al2O3 and CaO/SiO2 on the Viscosity of Calcium-Silicate-Based Slags Containing 10 Mass Pct MgO [J].
Kim, Hyuk ;
Matsuura, Hiroyuki ;
Tsukihashi, Fumitaka ;
Wang, Wanlin ;
Min, Dong Joon ;
Sohn, Il .
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE, 2013, 44 (01) :5-12
[10]   Effect of CaF2 and Li2O Additives on the Viscosity of CaO-SiO2 Na2O Slags [J].
Kim, Hyuk ;
Sohn, Il .
ISIJ INTERNATIONAL, 2011, 51 (01) :1-8
1234