scholarly journals Effect of Al2O3/SiO2 on the structure and properties of blast furnace slag glass-ceramics

2020 ◽  
Author(s):  
Zuhao Li ◽  
Feng He ◽  
Wentao Zhang ◽  
Junlin Xie
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Bending Strength ◽  
Glass Ceramics ◽  
Glass Network ◽  
Volume Density ◽  
Mas Nmr ◽  
Structure And Properties ◽  
Slag Glass ◽  
Furnace Slag

Abstract Different Al2O3/SiO2 glass-ceramics were prepared from blast furnace slag by traditional sintering method. The structure and properties of glasses or glass-ceramics were investigated by DSC, XRD, SEM, FTIR, 27Al MAS NMR. The DSC results showed that with the increase of Al2O3/SiO2, the glass transition temperature (Tg) first increased and then decreased, reached the minimum when Al2O3/SiO2 was 0.34. The volume density, bending strength and microhardness of glass-ceramics also showed the same variation rule. The FTIR and 27Al MAS NMR spectra results revealed this phenomenon. When Al2O3/SiO2 was 0.19, a large amount of Si4+ was added to the glass network to make the structure dense. With Al2O3/SiO2 increased from 0.24 to 0.34, the amount of [AlO6] in the glass increased while [AlO4] decreased, and the degree of network polymerization of the glass decreased; as Al2O3/SiO2 further increased from 0.34 to 0.39, [AlO4] increased and [AlO6] decreased in the glass, and the degree of network polymerization of the glass increased. The XRD results showed that the crystal phase of the glass-ceramics was composed of gehlenite, diopside and hyalophane. Moreover, with the increase of Al2O3/SiO2, the gehlenite content in the glass-ceramics increased, while the content of diopside and hyalophane decreased.

scholarly journals Preparation and Properties of Blast Furnace Slag Glass Ceramics Containing Cr2O3

2019 ◽  
Vol 38 (2019) ◽  
pp. 726-732 ◽  
Author(s):  
Yi-ci Wang ◽  
Wen-bin Xin ◽  
Xiao-geng Huo ◽  
Guo-ping Luo ◽  
Fang Zhang
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Bending Strength ◽  
Glass Ceramics ◽  
Scientific Basis ◽  
Raw Material ◽  
Nucleation Agent ◽  
Parent Glass ◽  
Factsage Software ◽  
Furnace Slag

AbstractIn this study, the blast furnace slag of the Baotou Steel and Iron Company was used as the main raw material to prepare glass ceramics with diopside as the main crystal phase. The composition of the parent glass was designed by thermodynamic calculations with FactSage software. Small amounts of the nucleation agent Cr2O3 were then added to the parent glass to induce crystallization. Differential thermal analysis was used to determine the nucleation and crystallization temperatures of the glasses, and scanning electron microscopy and X-ray diffraction were adopted to determine the microstructures and phase compositions of the glasses after heat treatment, respectively. The results showed that glass ceramics of the diopside phase can be prepared with up to 73 wt% blast furnace slag when 1.44–1.91 wt% Cr2O3 is added, and the ceramics have uniform compact grains and a high bending strength of about 84.6–101.7 MPa. In addition, the mechanical properties are better than those of natural marble and granite. These results provide basic information and a scientific basis for industrial production of diopside glass ceramics using molten blast furnace slag as the main raw material.

Effects of Al/Na and heat treatment on the structure and properties of glass ceramics from molten blast furnace slag

2019 ◽  
Vol 45 (11) ◽  
pp. 13692-13700 ◽  
Author(s):  
Wentao Zhang ◽  
Feng He ◽  
Yongli Xiao ◽  
Mongqin Xie ◽  
Junlin Xie ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Glass Ceramics ◽  
Structure And Properties ◽  
Furnace Slag

scholarly journals Study on the Preparation and Properties of Fe-tailings Based Foamed Glass-ceramics

2021 ◽  
Author(s):  
Pengwei Li ◽  
S.H. Luo ◽  
Qing Wang ◽  
Pudong Zhang ◽  
Yahui Zhang ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Building Materials ◽  
Bending Strength ◽  
Glass Ceramics ◽  
High Energy ◽  
Foaming Agent ◽  
Base Glass ◽  
Foamed Glass ◽  
Furnace Slag

Abstract Traditional building materials have disadvantages such as high pollution and high energy consumption, so it is particularly important to develop new environmentally friendly materials. In this paper, foamed glass-ceramics are prepared by high-temperature melting method with iron tailings, blast furnace slag, and desulfurization slag as the main raw materials, and CaCO3 as foaming agent. The effects of three kinds of basic glass scheme, the content of the foaming agent and heat treatment system on the degree of crystallization, micro-morphology, and crystal phase composition of foamed glass-ceramics are studied. The nucleation temperature and crystallization temperature of the basic glass are determined by differential thermal analysis curve to be 730 ℃ and 1000 ℃, respectively. Orthogonal experiments show that the optimal composition ratio of the prepared base glass is CaO: 22.25 wt.%, MgO: 4.57 wt.%, Al2O3: 6.19 wt.%, SiO2: 41.8 wt.%. The optimized scheme is based on a base glass prepared with 45 wt.% iron tailings, 25 wt.% blast furnace slag, and 30 wt.% desulfurization slag, added with 10% CaCO3 and sintered to 1000 °C for 3 h. The bending strength, fracture toughness, and elastic modulus are 95.73 Mpa, 53.09 Mpa·m1/2, 28023.55 Mpa, respectively.

Preparation of glass-ceramics with low density and high strength using blast furnace slag, glass fiber and water glass

2018 ◽  
Vol 44 (6) ◽  
pp. 6044-6053 ◽  
Author(s):  
H.T. Gao ◽  
X.H. Liu ◽  
J.Q. Chen ◽  
J.L. Qi ◽  
Y.B. Wang ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Glass Fiber ◽  
Blast Furnace Slag ◽  
Water Glass ◽  
Glass Ceramics ◽  
High Strength ◽  
Low Density ◽  
Slag Glass ◽  
Furnace Slag

Effects of SiO2/CaO ratio on viscosity, structure, and mechanical properties of blast furnace slag glass ceramics

2019 ◽  
Vol 233 ◽  
pp. 155-162 ◽  
Author(s):  
Ruidong Jia ◽  
Leibo Deng ◽  
Fei Yun ◽  
Hao Li ◽  
Xuefeng Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Glass Ceramics ◽  
Slag Glass ◽  
Furnace Slag

scholarly journals Optimization of heat treatment of glass-ceramics made from blast furnace slag

2020 ◽  
Vol 39 (1) ◽  
pp. 539-544
Author(s):  
Yi-Ci Wang ◽  
Pei-Jun Liu ◽  
Guo-Ping Luo ◽  
Zhe Liu ◽  
Peng-Fei Cao
Keyword(s):  
Heat Treatment ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Orthogonal Experiment ◽  
Glass Ceramics ◽  
Iron And Steel ◽  
Heat Treatment Regime ◽  
Main Crystalline Phase ◽  
Optimum Heat ◽  
Furnace Slag

AbstractCaO–MgO–Al2O3–SiO2 glass-ceramics with diopside as the main crystalline phase were prepared by melting blast furnace slag obtained from Baotou Iron and Steel Company. The effect of heat treatment on the crystallization behavior of glass-ceramics, containing a large proportion of melted blast furnace slag, was studied by means of differential thermal analysis and scanning electron microscopy. The optimum heat-treatment regime was obtained by orthogonal experimental results for glass-ceramics in which blast furnace slag comprised 70% of the composition and 1% Cr2O3 and 4% TiO2 were used as nucleating agents. The nucleation temperature was 750°C for 2.5 h and the crystallization temperature was 930°C for 1 h. Under this regime, the performance of the glass-ceramic was better than that of other groups in the orthogonal experiment.

29Si and 27Al MAS-NMR of NaOH-Activated Blast-Furnace Slag

1994 ◽  
Vol 77 (9) ◽  
pp. 2363-2368 ◽  
Author(s):  
Paul J. Schilling ◽  
Leslie G. Butler ◽  
Amitava Roy ◽  
Harvill C. Eaton
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Mas Nmr ◽  
27Al Mas Nmr ◽  
Furnace Slag
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