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Effect of K2O and Na2O on activity of components and MgO content of high Al2O3 slag |
WANG Liang1, CHENG Shu-sen1, LIU Peng-bo1, CHEN Yan-bo2 |
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Shougang Jingtang United Iron and Steel Co., Ltd., Tangshan 063210, Hebei, China |
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Abstract With the acceleration of consumption of high-grade iron ore and the gradual dilution of resources, the available iron ore raw materials for iron and steel enterprises are gradually transformed into medium and low grade raw materials. Especially high alumina iron ore, the use of such raw materials will undoubtedly increase the Al2O3 mass percent of blast furnace slag and affect the existing operation system of blast furnace.In order to ensure the metallurgical properties of slag, about 8% MgO must be added to the blast furnace slag, which contains 15%-17% high Al2O3. Because of high Al2O3 content, the metallurgical properties of blast furnace slag become worse. However, the MgO content of POSCO′s blast furnace slag with similar mass percent of Al2O3 is only about 4%, but the blast furnace has achieved high efficiency, stability and smooth running. Therefore, the effects of K2O and Na2O on the activity of each component in the quaternary slag system CaO-SiO2-Al2O3-MgO of blast furnace slag were studied based on the physical chemistry mechanism of the blast furnace CaO-SiO2-Al2O3-MgO quaternary slag system. The relationship between alkali metal oxides in slag and gas under the condition of slag-gas equilibrium was studied. The effects of K2O, Na2O and MgO on viscosity were calculated. The results show that considering the component activity of blast furnace slag CaO-SiO2-Al2O3-MgO, the distribution of alkali metals between slag and gas and the slag viscosity, the content of MgO can be reduced appropriately when the alkali metal oxides K2O and Na2O exist, and the component activity of blast furnace slag CaO-SiO2-Al2O3-MgO and slag viscosity can be kept basically unchanged.It is not only helpful to reduce the addition of magnesium-containing flux in blast furnace raw materials, improve the grade of raw materials, discharge alkali efficiently, reduce alkali harm, reduce carbon emissions, prolong the life of blast furnace and reduce costs, but also promote the iron and steel enterprises to achieve the goal of energy saving and emission reduction.
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Received: 20 July 2021
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