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

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.

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

Crystals ◽

10.3390/cryst10010030 ◽

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.

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X-ray Diffraction-Based Quantification of Amorphous Phase in Alkali-Activated Blast Furnace Slag

Advances in Civil Engineering Materials ◽

10.1520/acem20200167 ◽

2021 ◽

Vol 10 (1) ◽

pp. 20200167

Author(s):

K. Chiranjeevi Reddy ◽

Kolluru V. L. Subramaniam

Keyword(s):

Blast Furnace ◽

Amorphous Phase ◽

Blast Furnace Slag ◽

X Ray Diffraction ◽

X Ray ◽

Furnace Slag ◽

Alkali Activated

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Lost Wax Casting Process Design of Artificial Jade Cup Basing on Blast Furnace Slag

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.937.462 ◽

2014 ◽

Vol 937 ◽

pp. 462-464 ◽

Cited By ~ 1

Author(s):

Wei You ◽

Yan Mei Jiang ◽

Qian Lin ◽

Xiao Xia Yu ◽

Peng Fei Li ◽

...

Keyword(s):

Blast Furnace ◽

Production Process ◽

Blast Furnace Slag ◽

Casting Process ◽

Raw Material ◽

Added Value ◽

Industrial Solid Waste ◽

Shell Mould ◽

Additional Value ◽

Furnace Slag

The blast furnace slag is an industrial solid waste in the production process, this paper deals with the blast furnace slag as products -- artificial jade cup handicraft lost wax casting process of high additional value of main raw material, firstly analyses the production process of chemical composition and artificial jade common blast furnace slag and natural jade, then the detailed design of the lost wax casting process of artificial jade cup, including manufacturing, shell mould manufacturing, dewaxing, baking, imitation jade material melting and casting. The lost wax casting method for producing artificial jade crafts complex products, the added value of products, so as to achieve a high added value utilization of blast furnace slag.

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

Journal of Non-Crystalline Solids ◽

10.1016/j.jnoncrysol.2018.08.034 ◽

2018 ◽

Vol 500 ◽

pp. 453-459 ◽

Cited By ~ 4

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

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

Ironmaking & Steelmaking ◽

10.1179/1743281214y.0000000242 ◽

2014 ◽

Vol 42 (5) ◽

pp. 395-400 ◽

Cited By ~ 18

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

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Granulation mechanism of gas quenching blast furnace slag with different basicities

Ironmaking & Steelmaking ◽

10.1080/03019233.2020.1719314 ◽

2020 ◽

Vol 47 (10) ◽

pp. 1206-1216

Author(s):

Kang Yue ◽

Liu Chao ◽

Zhang Yu-zhu ◽

Xing Hong-wei

Keyword(s):

Blast Furnace ◽

Blast Furnace Slag ◽

Gas Quenching ◽

Granulation Mechanism ◽

Furnace Slag

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Influence of Process Conditions on the Structure and Hydraulic Activity of Air-Cooling Blast Furnace Slag

Materials Science Forum ◽

10.4028/www.scientific.net/msf.814.476 ◽

2015 ◽

Vol 814 ◽

pp. 476-482

Author(s):

Hui Wang ◽

Su Ping Cui ◽

Ya Li Wang

Keyword(s):

Blast Furnace ◽

Cooling Rate ◽

Heating Rate ◽

Blast Furnace Slag ◽

Glass Content ◽

Process Conditions ◽

Granulated Blast Furnace Slag ◽

Discharge Temperature ◽

Heat Preservation ◽

Furnace Slag

Using the industrial limestone, fly ash and pure chemical reagents as raw materials, the blast furnace slag was prepared by the fast air-cooled method. Using orthogonal experiment method, the influence of process conditions such as heating rate, heat preservation time of the blast furnace slag in hearth, discharge temperature of slag and cooling speed on the glass content and hydraulic activity of blast furnace slag were studied, the main influence factors and the optimal process conditions of blast furnace slag were determined. The results showed that the discharge temperature of slag was the key factor influencing on the glass content of granulated blast furnace slag. The impact degree of all process conditions on the glass content of granulated blast furnace slag accord with the following sequence: discharge temperature of slag > heat preservation time > heating rate > cooling rate. And heat preservation time and cooling rate were the key factors influencing 28 days activity index of blast furnace slag, the impact sequence of all process conditions on the 28 days activity index of granulated blast furnace slag was as follows: heat preservation time > cooling rate > discharge temperature of slag > heating rate. This study also optimized the process conditions of granulated blast furnace slag for different indicators.

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Moulding Process Design of Artificial Purple Jade Ship Basing on Blast Furnace Slag

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.937.476 ◽

2014 ◽

Vol 937 ◽

pp. 476-478

Author(s):

Wei You ◽

Shuai Shuai Wang ◽

Yu Ge Wang ◽

Qian Lin ◽

Xiao Xia Yu ◽

...

Keyword(s):

Blast Furnace ◽

Blast Furnace Slag ◽

Production Efficiency ◽

Process Analysis ◽

Value Added ◽

Structure Design ◽

Raw Material ◽

Added Value ◽

Moulding Process ◽

Furnace Slag

The blast furnace slag is an industrial solid waste in the production process, this paper deals with the blast furnace slag as moulding technology products -- artificial Purple Jade ship crafts high value-added main raw material preparation, analysis of the chemical composition of blast furnace slag and natural jade, moulding process for artificial Purple Jade ship blast furnace slag prepared were designed, including process analysis, press, die structure design, selection of heating system design, molding equipment checking. The molding method is suitable for the production of large quantities of artificial jade crafts, high production efficiency, so as to achieve a high added value utilization of blast furnace slag.

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

Journal of the Serbian Chemical Society ◽

10.2298/jsc121217051y ◽

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.

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