[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.7844/kirr.2019.28.4.44

Influence of Charging Condition of Al-dross on Maximum Concentration of Al in Molten Steel : Fundamental study for improvement of chemical energy in EAF process

Kim, Gyu-Wan (Dept. of Advanced Materials Engineering, Chosun University)
Kim, Sun-Joong (Dept. of Materials Engineering & Science, Chosun University)

Publication Information

Resources Recycling / v.28, no.4, 2019 , pp. 44-50 More about this Journal

Abstract

In the electric arc furnace process, the chemical energy such as the heat of oxidation reaction and the heat of carbon combustion etc. is consumed as 30% of the total input energy. In order to reduce $CO_2$ emission in EAF, it is necessary to decrease the use of electric power energy during scrap melting stage and increase the use of chemical energy. In general, when the carbon materials is individually charged into the molten steel, the carbon materials floated to the slag layer due to low density before it is dissolved in molten steel. When the concentration of carbon in the molten steel is high, the combustion energy of carbon by oxygen injection can lower the electric power energy and improve the chemical energy consumption. Therefore, an efficient charging methods of carbon material is required to increase the efficiency of carbon combustion heat. On the other hand, Al-dross, which is known as a by-product after Al smelting, includes over 25 mass% of metallic Al, and the oxidation heats of Al is lager than that of carbon. However, the recycling ratio fo Al-dross was very low and is almost landfilled. In order to effectively utilize the heats of oxidation of Al in Al-dross, it is necessary to study the application of Al-dross in the steel process. In this study, the dissolution efficiency of carbon and aluminum in molten steel was investigated by varying the reaction temperature and the mixing ratios of coke and Al-dross.

Keywords

Al-dross; EAF; Chemical energy; Al dissolution ratio;

Citations & Related Records

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