Effect of rotation rates on dissolution behavior of lime in CaO-FetO-SiO2-MgO system
J. Min. Metall. Sect. B-Metall., 60 (3) (2024) 317-327. DOI:10.2298/JMMB240719026J
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Available online 20 novembar 2024
(Received 19 July 2024; Accepted 22 October 2024)
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For the converter steelmaking process, incompletely dissolved lime will exist in steel slag in the form of f-CaO, which reduces the utilization rate of metallurgical slag and causes the waste of resources. It is extremely important to reduce the production of f-CaO in steel slag and promote the rapid and sufficient dissolution of lime. This paper is based on the early and middle stages of the converter slag-forming route based on the CaO component. The dissolution rate of lime in four different slags was measured by rotating rod method. The evolution behavior of the lime-slag interface and the change behavior of the lime dissolution rate were studied by X-ray diffractometer and an electron probe micro-analyzer. The experimental results show that CaO-FeO solid solutions and (Ca, Mg, Fe) olivine are formed when lime reacts with molten slag at 1400℃. When the FeO content decreases, CaO reacts with the calcium-magnesia-silica to form a high melting point and dense 2CaO·SiO2 layer. In addition, at different rotation rates, a 3CaO·SiO2 phase layer is formed between the CaO-FeO solid solution layer and the C2S layer. As the rotation rate increases, the dissolution rate of lime also increases and the mass transfer coefficient reaches the maximum at a rotation rate of 180 rpm. The maximum values are 20.54×10-6 m/s, 7.86×10-6 m/s, 9.38×10-6 m/s, 5.53×10-6 m/s, respectively.
Keywords: Lime; Reaction interface; 2CaO·SiO2; Dissolution rate; Mass transfer
Correspondence Address:
J.-L. Li,
Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking, Wuhan University of Science and Technology, Wuhan, Hubei, China; Key Laboratory for Ferrous Metallurgy and resources utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan, Hubei, China;
email: jli@wust.edu.cn
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