Effect of Unburned Pulverized Coal on the Melting Characteristics and Fluidity of Blast Furnace Slag

Xiang, Dongwen; Shen, Fengman; Jiang, Xin; Gao, Qiuzhi; Zheng, Haiyan

doi:10.3390/cryst11060579

Cited by 7 publications

(2 citation statements)

References 27 publications

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“…Viscosity is a critical property of slag that affects the metallurgical process [1][2][3][4][5][6][7]. The CaO-SiO 2 -MgO-Al 2 O 3 slag system is well-known for its widespread use in pyrometallurgical operations [8][9][10]. The amount of high-quality iron resources decreases with the continuous exploitation in the world; thus, the low-quality iron ores with high Al 2 O 3 become a choice.…”

Section: Introductionmentioning

confidence: 99%

Effects of Basicity and Al2O3 Content on Viscosity and Crystallization Behavior of Super-High-Alumina Slag

et al. 2022

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The CaO-SiO2-MgO-Al2O3 slags with high alumina content are widely applied in various pyrometallurgical processes. However, for super-high-alumina slags, especially for those with alumina content of more than 25 wt%, there is a lack of relevant studies about the properties of slag. The melting behavior, viscosity, structural property, and crystallization behavior of high-alumina slag with the fixed MgO content of 11.13 wt% and Al2O3 content from 27.61 wt% to 40 wt% were investigated. The results revealed that the liquidus temperatures and complete solidification temperatures of slag increased with the increasing binary basicity and Al2O3 content. The melting temperature and viscosity of the CaO-SiO2-11.13wt%MgO-Al2O3 slag system increased with the increasing basicity from 0.8 to 1 and Al2O3 content from 27.61 wt% to 40 wt%. The increase in Al2O3 caused the formation of high-crystallinity and high melting point materials in the slag, such as spinel and Åkermanite. A large number of non-uniform phases could quickly crystallize out of the solids present in the slag melt, thereby increasing the slag viscosity and deteriorating the fluidity of the slag.

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Section: Introductionmentioning

confidence: 99%

Effects of Basicity and Al2O3 Content on Viscosity and Crystallization Behavior of Super-High-Alumina Slag

et al. 2022

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“…In recent years, with the extensive use of high alumina iron ore, the content of Al 2 O 3 in slag has increased greatly, which inevitably affects the metallurgical properties of blast furnace slag [1][2][3][4][5][6][7][8][9][10]. Among these metallurgical properties, the desulfurization ability of blast furnace slag plays an important role in the quality of hot metal.…”

Section: Introductionmentioning

confidence: 99%

Desulfurization Ability of Blast Furnace Slag Containing High Al2O3 at 1773 K

et al. 2021

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With the consumption of high-quality iron ore resources, the grade of iron ore raw used in the iron making process has gradually decreased. The high aluminum raw materials has led to an increase in the Al2O3 content in the blast furnace slag, which has affected the normal operation of the blast furnace. The activity of the components involved in the desulfurization reaction is an important factor affecting the desulfurization process. In this paper, the effects of B(w(CaO)/w(SiO2)) and w(MgO)/w(Al2O3) on the desulfurization ability of a CaO-SiO2-MgO-Al2O3 quaternary blast furnace slag system were studied by using a double-layer graphite crucible to simulate the process of molten iron dropping through the slag at 1773 K. The desulfurization reaction mechanism of high alumina blast furnace slag is explained from the aspects of slag structure and component activity, which provides a theoretical basis for the reasonable selection of a slag making system under the condition of a high alumina content. The effects of different B and w(MgO)/w(Al2O3) on the slag structure 2343 analyzed by Fourier transform infrared spectroscopy (FT-IR). The results show that when w(MgO)/w(Al2O3) = 0.50 and w(Al2O3) = 20%, the desulfurization ability and MgO activity of slag increased with the increase of B; when w(Al2O3) = 20% and B = 1.30, the desulfurization ability and MgO activity of the slag increased with the increase of w(MgO)/w(Al2O3). The FT-IR analysis showed that with the increase of B or w(MgO)/w(Al2O3), the dissociated free oxygen ions (O2-) in the slag increased, and the dissociated free oxygen ions (O2-) interacted with the bridging oxygen (O0) of silicate, which made the complex Si-O structure in the slag gradually depolymerize and increase the desulfurization ability.

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Experimental study on flow properties of blast furnace slag with different alumina contents based on the image measurement method

Shao

Liu

et al. 2023

Ceramics International

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Effect of Unburned Pulverized Coal on the Melting Characteristics and Fluidity of Blast Furnace Slag

Cited by 7 publications

References 27 publications

Effects of Basicity and Al2O3 Content on Viscosity and Crystallization Behavior of Super-High-Alumina Slag

Effects of Basicity and Al2O3 Content on Viscosity and Crystallization Behavior of Super-High-Alumina Slag

Desulfurization Ability of Blast Furnace Slag Containing High Al2O3 at 1773 K

Experimental study on flow properties of blast furnace slag with different alumina contents based on the image measurement method

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