BLAST FURNACERN - USE IRON ORE AND COKE AS MAIN FUEL AND SOURCES OF ENERGYRN - MELT IRON ORE AND COKE TO PRODUCE PIG IRON HIGH IN CARBON CONTENT WHICH IS FED INTO A CONVERTER TO REMOVE IMPURITIES, MANUFACTURING THE DESIRED PRODUCTS AFTER THE ADJUSTMENT OF METAL PROPERTIES RN - NEED A HIGH INVESTMENT IN FACILITY DEVELOPMENT AND TAKE UP A LARGE AREA RN PRODUCE A LARGE AMOUNT OF PIG IRON FOR A LONGER PERIOD OF TIMERN - MAKE IT EASY TO PRODUCE CLEAN STEEL CONTAINING LESS IMPURITIESRN - EMIT A LARGE AMOUNT OF CARBON DIOXIDE, CREATING ENVIRONMENTAL ISSUESRNRNRN ELECTRIC ARC FURNACERN - UNLIKE A BLAST FURNACE USING IRON, UTILIZE OBSOLESCENT SCRAP AS MAIN FUELRN - USE ELECTRICITY AS MAIN SOURCES OF ENERGY TO MELT SCRAP AND ADJUST THE PROPERTIES IN A LADLE FURNACE, CONSEQUENTLY MANUFACTURING THE DESIRED PRODUCTS RN - NEED RELATIVELY LOWER INVESTMENT COSTS AND TAKE UP LESS SPACERN - TAKE LESS TIME TO MANUFACTURE PRODUCTS, ENABLING A PROMPT RESPONSE TO DEMANDRNRNRNSTRENGTHS OF ELECTRIC ARC FURNACE STEELMAKINGRN- EASILY ADJUST THE FURNACE TEMPERATURE AND EXCELLENT IN HEAT EFFICIENCYRN- EASILY CONTROL OXIDIZATION AND REDUCTION, MAKING IT EASIER TO REMOVE PHOSPHOROUS AND SULFURRN- LESS LIMIT FOR FUEL TYPES AND ENABLE REFINING OF ALL TYPES OF STEEL, MAKING IT MORE ADVANTAGEOUS TO PRODUCE SPECIAL STEELRN- LESS EXPENSIVE IN FACILITY INSTALLATION AND LESS LIMIT FOR LOCATION, COMPARED TO OTHER STEELMAKING METHODSRNRNWEAKNESSES OF ELECTRIC ARC FURNACE STEELMAKINGRN- CONSUME A HUGE AMOUNT OF ELECTRICITYRN- HIGH MANUFACTURING COSTS DUE TO THE USE OF EXPENSIVE SCRAPRN

TAPPING METHODS OF ELECTRIC ARC FURNACE / STRENGTHS AND WEAKNESSESRNRNRN1. SPOUT TAPPING (OLD-FASHIONED, SINPYEONG FACTORY)RN- THE FURNACE IS TILTED THROUGH AN ANGLE OF ABOUT 45 DEGREE FOR TAPPING STEEL. RN- EASY TO MAINTAIN THE TAPPING HOLERN- WITH THE TILTING ANGLE WIDE, THE WATER-COOLING RATE IN THE FURNACE BODY IS LOW, MAKING THE REFRACTORY CONSUMPTION RATE HIGHER. RN- UPON TAPPING, THE SLAG IS TAPPED FROM THE FURNACE AS WELL, WHICH MAY HAVE A NEGATIVE EFFECT ON STEEL QUALITY. RN - THE ENTIRE AMOUNT OF STEEL AND SLAG IS TAPPED FROM THE FURNACE, MAKING IT EASIER TO MANAGE THE FURNACE. RNRN2. ECCENTRIC BOTTOM TAPPING (NEW METHOD ADOPTED BY MOST OF ELECTRIC ARC FURNACES, NOKSAN FACTORY)RN- THE FURNACE IS TILTED THROUGH AN ANGLE OF ABOUT 25 DEGREE, AND THE STEEL IS TAPPED OUT OF THE TAP HOLE IN THE ECCENTRIC BOTTOM. RN- THE SLIGHT TILTING ANGLE MAKES THE WATER-COOLING RATE IN THE FURNACE BODY HIGH, POSSIBLY DECREASING THE REFRACTORY CONSUMPTION RATE. RN- UPON TAPPING, THE STEEL IS TAPPED FROM THE FURNACE WITHOUT THE INFLOW OF SLAG, REDUCING INCLUSION IN THE STEEL AND THUS MAKING IT MORE LIKELY TO PRODUCE CLEAN STEEL. RN- UPON TAPPING, THE FERROALLOYS ARE PUT INTO THE LADLE, WHICH CAN ENHANCE THE RECOVERY OF THE FERROALLOYS. RN- AS THE RESIDUAL STEEL IRON REMAINS IN THE FURNACE, IT IS DIFFICULT TO MANAGE THE FURNACE. RN- DUE TO THE RESIDUAL STEEL IRON IN THE FURNACE, THE RETAINING HEAT AT THE HIGH TEMPERATURE HELPS INCREASE HEAT EFFICIENCY. RN