Understanding the Relationship Between Structure and Thermophysical Properties of CaO-SiO2-MgO-Al2O3 Molten Slags

Sun, Yongqi1; Wang, Hao1; Zhang, Zuotai2,3

2018-04

10.1007/s11663-018-1178-y

METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE   影响因子和分区

1073-5615

1543-1916

In the present work, the relationship between the microscopic structure and macroscopic thermophysical properties in a basic CaO-SiO2-MgO-Al2O3 quaternary system was identified using Fourier transformation infrared, Raman and Al-27 magic angular spinning nuclear magnetic resonance (MAS-NMR) techniques. The Raman spectra quantitatively proved that with increasing Al2O3 content, the concentrations of the symmetric units of Q (0)(Si) and Q (2)(Si) decreased, while those of the asymmetric units of Q (1)(Si) and Q (3)(Si) increased; consequently, the degree of polymerization of the networks increased, which resulted in an increase in slag viscosity. The Al-27 MAS-NMR spectra demonstrated that three structural units of Al atoms, namely, AlO4, AlO5, and AlO6, mainly existed in the networks. With increasing Al2O3 content, the concentration of AlO4 slightly decreased, while those of AlO5 and AlO6 increased; overall, Al2O3 acted as a network former in the present system. The increasing Al2O3 content led to additional AlO6 and Si-NBO-Ca-NBO-Al frameworks, which replaced Si-NBO-Ca-NBO-Si in the networks (NBO: non-bridging oxygen) and induced a change in the primarily precipitated crystalline phase from Ca2MgSi2O7 and Ca2Al2SiO7 to MgAlO4. (C) The Minerals, Metals & Materials Society and ASM International 2018

SCI ; EI

英语

通讯

National Natural Science Foundation of China[51672006] ; National Natural Science Foundation of China[51522401] ; National Natural Science Foundation of China[51472007]

Materials Science ; Metallurgy & Metallurgical Engineering

Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000426808500020

SPRINGER

20183805843661

Alumina ; Aluminum oxide ; Fourier transforms ; Magnesia ; Nuclear magnetic resonance ; Nuclear magnetic resonance spectroscopy ; Silica ; Slags ; Thermodynamic properties

Thermodynamics:641.1 ; Inorganic Compounds:804.2 ; Mathematical Transformations:921.3 ; Atomic and Molecular Physics:931.3

MATERIALS SCIENCE

Web of Science

1.Univ Beijing, Dept Energy & Resources Engn, Coll Engn, Beijing 100871, Peoples R China
2.South Univ Sci & Technol China, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China
3.Key Lab Municipal Solid Waste Recycling Technol &, Shenzhen 518055, Peoples R China

Sun, Yongqi,Wang, Hao,Zhang, Zuotai. Understanding the Relationship Between Structure and Thermophysical Properties of CaO-SiO2-MgO-Al2O3 Molten Slags[J]. METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE,2018,49(2):677-687.

Sun, Yongqi,Wang, Hao,&Zhang, Zuotai.(2018).Understanding the Relationship Between Structure and Thermophysical Properties of CaO-SiO2-MgO-Al2O3 Molten Slags.METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE,49(2),677-687.

Sun, Yongqi,et al."Understanding the Relationship Between Structure and Thermophysical Properties of CaO-SiO2-MgO-Al2O3 Molten Slags".METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE 49.2(2018):677-687.