slag foaming in an electric arc furnace

A cooled industrial camera, including advanced machine-vision software, detects the height of foaming slag inside the electric-arc furnace. In this experiment property such as strength, toughness, specific gravity water absorption and angularity of furnace slag were find out The EAF control system automatically adjusts the conveying speed to maintain the steel bath at the target temperature and controls the O2 and C injection to maintain the proper foamy slag. The CO gas bubbles also helps in slag foaming (create an emulsion) which helps to contain the electric arc and improve energy transfer to the steel bath instead of to the furnace shell and transfer to the bath by radiation energy. In the case of coal injection into slags, the reduction of iron oxides will generate a large number of bubbles. In the slag foaming process, carbon is injected into the slag, reacts with FeO in the slag producing CO, which foams the slag. However due to its fast and unpredictable changes, its quality is difficult to control. This procedure has an important impact on the thermal efficiency, tapping time (reducing the cold charge melting) and refractory lining/electrodes consumption of the EAF. Physical Description. The transfer efficiencies under various slag … The slag foam protects the refractories from the high intensity arc allowing for high power input and productivity. Foaming slag quality is an important parameter that can be used to improve the efficiency and quality of electric arc furnace process. A method for controlling the foaming of slag in an electric arc furnace is disclosed. EAFS solidifies in a similar manner to lava from a volcano. Slag foaming is one of the main practices to be induced and controlled during the electric arc (EAF) furnace operation , , , . The furnace comprises at least one electrode column. Its cooled structure is best described as a solid solution of oxides. Impurities in the molten scrap metal rise to the surface forming slag. The Optical Foaming Slag Manager is a closed loop control system used to control the height of foaming slag inside the electric-arc furnace. Desirable properties of road aggregates are its strength, hardness, toughness, durability, shape of aggregate and adhesion with bitumen. Electric Arc Furnace Slag (EAFS) Brief Description . In an electric arc furnace carbon is needed as an alloying element; whereas excess carbon needs to be removed from steel reduced in a blast furnace, it needs to be added to hydrogen-reduced steel. In this paper, an Adaptive Slag foaming in electric arc furnace (EAF) steelmaking is critical for high productivity. A KINETIC STUDY OF CARBON INJECTION INTO ELECTRIC ARC FURNACE SLAGS 399 Introduction Slag foaming has been extensively studied because of its importance in many pyrometallurgical processes1–2. Slag foaming in an electric arc furnace (EAF) is examined using a mathematical model of the EAF to compute the CO generation rate and slag chemistry and laboratory measurements of the foam index. 7 "Results of Foaming Slag and Scrap Meltdown Control SIMELT CSM/FSM Based on Structure-Borne Sound in Electric Arc Furnace Operation;" Thomas Matschullat, Detlef Rieger, Bjorn Dittmer, Klaus Kruger, Arno Dobbeler, and Helge Mees; AISTech 2012 Proceedings. EAFS is a by-product of the steel-making process. In the furnace, the scrap melts by immersion and the electric arc is working on a flat bath covered by a foamy slag. Electric arc furnace slag (EAFS) is a co-product of steel making process. Current is applied to the electrode column, causing an arc to form between the tip of the electrode column and the scrap, melting the scrap. The reduction of iron oxides will generate a large number of bubbles of foaming slag quality is difficult to the! 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