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Weiqiang Liu
Process and Systems Engineering Laboratory, Faculty of Science and Engineering, Åbo Akademi University, FI 20500 Åbo, Finland

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Journal article
Published: 07 August 2021 in Materials
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Vanadium−titanium magnetite (VTM) is an important raw material for ironmaking under the situation of increasingly demanding scarce resources. To further improve the metallurgical properties of pellets, and to satisfy the requirements of blast furnace slag basicity, finely ground dolomite and limestone have been added to the pellet. In this study, the effect of finely ground dolomite and limestone on the metallurgical properties (green pellet drop strength, cold compression strength, reduction swelling index, and microscopic mineral structure) of VTM pellets were investigated. With the addition of finely ground dolomite and limestone, the drop strength of the green pellet was improved. The effect of adding finely ground limestone was greater than adding finely ground dolomite. Adding more finely ground dolomite and limestone compared to pellets without limestone and dolomite, the cold compression strength was decreased, which was attributed to the decomposition of limestone and dolomite during the induration of pellets. With the addition of dolomite, the reduction swelling index (RSI) increased firstly and then decreased. When the basicity of the pellet was 0.54 to 0.94, the slag phase with the lowest melting point was formed, corresponding to the maximum of the reduction swelling index. For the pellets with added limestone, the reduction swelling of the pellets deteriorated. The reduction index of the pellets increased and reached the maximum (26.6%) at a basicity of 1.54, which belongs to abnormal swelling.

ACS Style

Hao Liu; Shihong Peng; Ke Zhang; Yuelin Qin; Fei Meng; Wenchao He; Weiqiang Liu; Min Chen; Lixiang Yan. Effect of Finely Ground Limestone and Dolomite on Compression Strength and Reduction Swelling of Vanadium-Titanium Pellets. Materials 2021, 14, 4433 .

AMA Style

Hao Liu, Shihong Peng, Ke Zhang, Yuelin Qin, Fei Meng, Wenchao He, Weiqiang Liu, Min Chen, Lixiang Yan. Effect of Finely Ground Limestone and Dolomite on Compression Strength and Reduction Swelling of Vanadium-Titanium Pellets. Materials. 2021; 14 (16):4433.

Chicago/Turabian Style

Hao Liu; Shihong Peng; Ke Zhang; Yuelin Qin; Fei Meng; Wenchao He; Weiqiang Liu; Min Chen; Lixiang Yan. 2021. "Effect of Finely Ground Limestone and Dolomite on Compression Strength and Reduction Swelling of Vanadium-Titanium Pellets." Materials 14, no. 16: 4433.

Journal article
Published: 11 September 2020 in Metals
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This work studied the effect of B2O3 (analytical reagent) on the parameters of a sintering pot test, as well as the metallurgical properties and microstructure of the sinter samples, to determine the feasibility of applying solid waste containing B2O3 in vanadium–titanium sintering. The results show that along with B2O3 addition, the mechanical strength of the sinter first increases and then decreases; the maximum strength was found upon the addition of 3.0% of B2O3. The low-temperature reduction and pulverization rate of the vanadium–titanium sinter were also improved, while the start and end temperatures of softening showed a decreasing trend. The microstructure of the sinter was found to change from plate structure to particle and point structure, with uniformly distributed small areas. The sintering pots created by B2O3 addition had low total porosity but a greater pore diameter than pots created without the reagent.

ACS Style

Hao Liu; Ke Zhang; Yuelin Qin; Henrik Saxén; Weiqiang Liu; Xiaoyan Xiang. Effect of B2O3 on the Sintering Process of Vanadium–Titanium Magnet Concentrates and Hematite. Metals 2020, 10, 1224 .

AMA Style

Hao Liu, Ke Zhang, Yuelin Qin, Henrik Saxén, Weiqiang Liu, Xiaoyan Xiang. Effect of B2O3 on the Sintering Process of Vanadium–Titanium Magnet Concentrates and Hematite. Metals. 2020; 10 (9):1224.

Chicago/Turabian Style

Hao Liu; Ke Zhang; Yuelin Qin; Henrik Saxén; Weiqiang Liu; Xiaoyan Xiang. 2020. "Effect of B2O3 on the Sintering Process of Vanadium–Titanium Magnet Concentrates and Hematite." Metals 10, no. 9: 1224.

Research articles
Published: 31 May 2020 in Ironmaking & Steelmaking
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An image analysis-based method is developed to automatically interpret videos of a transparent Hele-Shaw model in studies of blast furnace hearth drainage in pilot scale. By the approach, information from experiments can be extracted for quantitative assessment of the draining phenomena. The algorithm consists of modules for (1) image pre-processing, (2) interface tracking, and (3) bending-point detection. The pre-processing step makes preparatory estimates for the next module that extracts the liquid–gas and liquid–liquid interfaces. Finally, bending points of the interfaces are detected and parameters quantifying the interface bending are calculated. The algorithm is illustrated by applying it to a video of a draining experiment, demonstrating how information can be extracted. The method can be used to compile information from a large set of experiments to gain a deeper understanding of the complex two-phase flow in the blast furnace hearth and to quantify the findings for a validation of computational models.

ACS Style

Weiqiang Liu; Debanga Nandan Mondal; Alf Hermanson; Lei Shao; Henrik Saxén. An image analysis-based method for automatic data extraction from pilot draining experiments. Ironmaking & Steelmaking 2020, 48, 263 -274.

AMA Style

Weiqiang Liu, Debanga Nandan Mondal, Alf Hermanson, Lei Shao, Henrik Saxén. An image analysis-based method for automatic data extraction from pilot draining experiments. Ironmaking & Steelmaking. 2020; 48 (3):263-274.

Chicago/Turabian Style

Weiqiang Liu; Debanga Nandan Mondal; Alf Hermanson; Lei Shao; Henrik Saxén. 2020. "An image analysis-based method for automatic data extraction from pilot draining experiments." Ironmaking & Steelmaking 48, no. 3: 263-274.

Journal article
Published: 09 April 2020 in Metals
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The smooth drainage of produced iron and slag is a prerequisite for stable and efficient blast furnace operation. For this it is essential to understand the drainage behavior and the evolution of the liquid levels in the hearth. A two-dimensional Hele–Shaw model was used to study the liquid–liquid and liquid–gas interfaces experimentally and to clarify the effect of the initial amount of iron and slag, slag viscosity, and blast pressure on the drainage behavior. In accordance with the findings of other investigators, the gas breakthrough time increased and residual ratios for both liquids decreased with an increase of the initial levels of iron and slag, a decrease in blast pressure, and an increase in slag viscosity. The conditions under which the slag–iron interface in the end state was at the taphole and not below it were finally studied and reported.

ACS Style

Weiqiang Liu; Lei Shao; Henrik Saxén. Experimental Model Study of Liquid–Liquid and Liquid–Gas Interfaces during Blast Furnace Hearth Drainage. Metals 2020, 10, 496 .

AMA Style

Weiqiang Liu, Lei Shao, Henrik Saxén. Experimental Model Study of Liquid–Liquid and Liquid–Gas Interfaces during Blast Furnace Hearth Drainage. Metals. 2020; 10 (4):496.

Chicago/Turabian Style

Weiqiang Liu; Lei Shao; Henrik Saxén. 2020. "Experimental Model Study of Liquid–Liquid and Liquid–Gas Interfaces during Blast Furnace Hearth Drainage." Metals 10, no. 4: 496.