Effect of TiO<sub>2</sub> on physicochemical properties and structure of high-alumina blast furnace slag

Yan Hua; Liu Huajun; Chen Buxin; Hu Meilong

doi:10.7513/j.issn.1004-7638.2022.02.018

Volume 43 Issue 2

May 2022

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Yan Hua, Liu Huajun, Chen Buxin, Hu Meilong. Effect of TiO2 on physicochemical properties and structure of high-alumina blast furnace slag[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(2): 118-124. doi: 10.7513/j.issn.1004-7638.2022.02.018

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Yan Hua, Liu Huajun, Chen Buxin, Hu Meilong. Effect of TiO₂ on physicochemical properties and structure of high-alumina blast furnace slag[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(2): 118-124. doi: 10.7513/j.issn.1004-7638.2022.02.018

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Effect of TiO₂ on physicochemical properties and structure of high-alumina blast furnace slag

doi: 10.7513/j.issn.1004-7638.2022.02.018

Yan Hua^1
,,
Liu Huajun¹,
Chen Buxin²,
Hu Meilong^{2
,
,}

1.
Chongqing Huineng Biaopu Technology Co., Ltd., Chongqing 401121, China
2.
College of Material Science and Engineering, Chongqing University, Chongqing 400044, China

Received Date: 2021-12-18
Available Online: 2022-05-11
Publish Date: 2022-04-28

Abstract

Abstract

With the increase of the high-alumina raw materials with high economy in blast furnace (BF) of domestic iron and steel enterprises, the content of Al₂O₃ in slag increases and the fluidity of the slag iron becomes worse, which brings a series of problems to BF smelting. Taking five-component CaO-SiO₂-Al₂O₃-MgO-TiO₂ slag system as the research object, through phase diagram theoretical calculation, experimental research and slag structure analysis, the effects of different TiO₂ content (low titanium 5%, medium titanium 15%, and high titanium 25%) in high-alumina slag on the viscosity and melting temperature of high-alumina BF slag were studied, The reasons affecting the physicochemical properties of slag are analyzed by slag structure. The results show that the fixed alkalinity R₂ is 1.25, the mass fraction of TiO₂ increases from 1% to 25% and the melting temperature of slag in the phase diagram first decreases and then increases. When the mass fraction of TiO₂ is 7%, the liquid phase of slag first precipitates from plagioclase calcium aluminosilicate (Ca₂Al₂SiO₇) to calcium titanate (CaTiO₃) with melting point of 1975 ℃, and the melting temperature of slag increases. When the TiO₂ content increases from 5% (low titanium) to 25% (high titanium) the slag viscosity and melting temperature decrease. The higher the temperature, the better the fluidity of slag, that is, TiO₂ in slag exists in [TiO₆]8- octahedron structure, which can disintegrate the complex silica network structure in slag. When the content of TiO₂ increases from 5% to 25%, the content of complex structural unit Si(Q²+Q³) in the slag decreases, the content of simple structural unit Si(Q⁰+Q¹) increases, Si(Q²+Q³)/Si(Q⁰+Q¹) decreases, and the slag structure is simplified, that is, TiO₂ acts as a slag modifier in the slag whether in low, medium or high titanium content, which is helpful to reduce the viscosity and it plays a positive role in improving slag fluidity.
- high-alumina blast furnace slag,
- TiO₂,
- physicochemical properties,
- slag structure

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References(20)

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