scholarly journals Influence of Crystallization Behavior of Gas Quenching Blast Furnace Slag on the Preparation of Amorphous Slag Beads

Crystals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 30
Author(s):  
Yue Kang ◽  
Chao Liu ◽  
Yuzhu Zhang ◽  
Hongwei Xing
Keyword(s):  
Activation Energy ◽  
Blast Furnace ◽  
Cooling Rate ◽  
Blast Furnace Slag ◽  
Crystallization Behavior ◽  
Crystallization Activation Energy ◽  
Quenching Temperature ◽  
Quenching Process ◽  
Gas Quenching ◽  
Furnace Slag

Slag beads with different crystal content could be obtained through the gas quenching blast furnace slag (BFS) process. In order to increase the additional value of the slag beads as much as possible, it was necessary to restrain the crystallization of the slag beads as much as possible. In this paper, the mineral types and crystallization temperatures of BFS with different basicities and cooling rates were studied by using Factsage thermodynamic software, XRD, and differential scanning calorimeter (DSC) experiments, which obtained the gas quenching temperature and the cooling rate needed to restrain crystallization behavior in the gas quenching process; The crystallization mechanism was studied by calculating crystallization activation energy (Ec) using the DSC experiment, at the same time, the thermodynamic results were verified. The proper basicity and cooling rate of BFS were found to be conducive to the preparation of amorphous slag beads. The results showed that the initial crystallization temperature decreased with decreasing the basicity and increasing the cooling rate, which could increase the amorphous content of slag beads in the gas quenching process. The crystallization activation energy (Ec) increased with decreasing basicity, which increased the crystallization barrier.

Crystallization behavior of amorphous slag beads prepared by gas quenching of blast furnace slag

2018 ◽  
Vol 500 ◽  
pp. 453-459 ◽  
Author(s):  
Yue Kang ◽  
Chao Liu ◽  
Yuzhu Zhang ◽  
Hongwei Xing ◽  
Maofa Jiang
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Crystallization Behavior ◽  
Gas Quenching ◽  
Furnace Slag

scholarly journals Granulation Effect Analysis of Gas Quenching Blast Furnace Slag with Different Basicities

Coatings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 372
Author(s):  
Chao Liu ◽  
Yue Kang ◽  
Yuzhu Zhang ◽  
Hongwei Xing
Keyword(s):  
Blast Furnace ◽  
Cooling Rate ◽  
Amorphous Phase ◽  
Blast Furnace Slag ◽  
Formation Rate ◽  
Added Value ◽  
Effect Analysis ◽  
Bead Formation ◽  
Gas Quenching ◽  
Furnace Slag

High content amorphous phase blast furnace slag beads were prepared by gas quenching blast furnace slag (BFS), which could not only avoid a series of environmental problems caused by traditional water quenching methods, but also significantly increase the added value of BFS subsequent products. In this paper, the granulation mechanism of BFS and the amorphous phase formation mechanism of slag beads were studied by combining the physical properties of BFS and the granulation effect. The results showed that the viscosity of BFS decreased with the increase of basicity; the bigger the basicity, the higher the bead formation rate, the smaller the particle size and the more regular the slag shape. The smaller the basicity, the greater the crystallization activation energy and the smaller the Avrami exponent, which indicated that the crystal was more difficult to nucleate and grow. The increase of the cooling rate could effectively inhibit crystal precipitation. Therefore, the high basicity and cooling rate could not only guarantee the high bead formation rate of BFS, but also ensure the high content amorphous phase of slag beads.

scholarly journals Study on the mineralogical crystallization of granulation of gas-quenched blast furnace slag

2018 ◽  
Vol 83 (9) ◽  
pp. 1031-1045
Author(s):  
Kang Yue ◽  
Liu Chao ◽  
Zhang Yuzhu ◽  
Xing Hongwei ◽  
Long Yue ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Crystallization Temperature ◽  
Blast Furnace Slag ◽  
Waste Heat ◽  
Thermodynamic Simulation ◽  
Value Added ◽  
Al2o3 Content ◽  
Quenching Temperature ◽  
Gas Quenching ◽  
Furnace Slag

The process of granulation in blast furnace slag (BFS) by gas quenching can effectively recover the waste heat of BFS and improve the value-added nature of the BFS byproduct. With decreasing temperature, BFS crystallizes into melilite, anorthite, spinel, etc. Mineral crystallization, however, is not conducive to the production of amorphous BFS beads. This study uses thermodynamic simulation and remelting experiments to study the influences of basicity, acidity, and the MgO and Al2O3 content of the BFS on the crystallization. By controlling the composition of the BFS, mineral crystallization in the process of granulation in BFS, by gas quenching, could be prevented. The results show that increasing the basicity of the BFS causes the mineral crystallization temperature to increase rapidly. The mineral phase then crystallizes at a higher temperature, which is not conducive to the formation of an amorphous phase. Increasing the acidity of the BFS can greatly decrease the crystallization temperature, e.g., when the acidity increases to 1.3, amorphous BFS beads can be obtained at the gas quenching temperature (1623 K). Although increasing the MgO and Al2O3 contents in the BFS had little effect on the crystallization temperature and yield, the preparation of amorphous BFS beads by gas quenching could be realized by adjusting the acidity of the BFS.

scholarly journals Effect of cooling rate on the crystallization behavior of perovskite in high titanium-bearing blast furnace slag

2014 ◽  
Vol 21 (11) ◽  
pp. 1052-1061 ◽  
Author(s):  
Lu Liu ◽  
Mei-long Hu ◽  
Chen-guang Bai ◽  
Xue-wei Lü ◽  
Yu-zhou Xu ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Cooling Rate ◽  
Blast Furnace Slag ◽  
Crystallization Behavior ◽  
Furnace Slag

Determination of optimum blast furnace slag cooling rate for slag recycling in cement manufacture

2014 ◽  
Vol 42 (5) ◽  
pp. 395-400 ◽  
Author(s):  
Y. L. Qin ◽  
X. W. Lv ◽  
J. Zhang ◽  
J. L. Hao ◽  
C. G. Bai
Keyword(s):  
Blast Furnace ◽  
Cooling Rate ◽  
Blast Furnace Slag ◽  
Cement Manufacture ◽  
Furnace Slag ◽  
Slag Cooling

scholarly journals Mutual Influence of Special Components in Baotou Steel Blast Furnace Slag on the Crystallization Behavior of Glass

2012 ◽  
Vol 2012 ◽  
pp. 1-6
Author(s):  
Yici Wang ◽  
Qi Jiang ◽  
Guoping Luo ◽  
Wenwu Yu ◽  
Yan Ban
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Crystallization Behavior ◽  
Mutual Influence ◽  
Raw Materials ◽  
Glass Ceramics ◽  
Nucleating Agent ◽  
Crystal Phase ◽  
Furnace Slag ◽  
Crystallization Of Glass

In the process of glass-ceramics prepared with Baotou steel blast furnace slag, quartz sand, and other raw materials by melting method, the mutual influence of the special components such as CaF2, REXOY, TiO2, K2O, and Na2O in the blast furnace slag on the crystallization behavior of parent glass was investigated using differential thermal analysis (DTA) and X-ray diffraction (XRD). The results show that the special components in slag can reduce the crystallization temperature and promote crystallization of glass phase, which belongs to surface crystallization of glass, and they cannot play the role of the nucleating agent; the major crystal phase composed of diopside, diopside containing aluminum and anorthite, is slightly different from the expected main crystal phase of diopside. Therefore, the nucleating agents of proper species and quantity must be added into the raw materials in order to obtain glass-ceramics. The results have important theoretical guidance meaning for realizing industrial production of Baotou steel blast furnace slag glass-ceramics preparation.

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