A blast furnace is used to make steel from liquid iron, while an electric arc furnace is used to make steel from scrap material. Electric arc furnaces use two different types of electrical currents to create heat. Blast furnaces force air into the bottom of the furnace into a heated stove area.
What is the difference between furnace and blast furnace?
Blast furnaces are similar to furnaces, but can smelt only raw ore, ore blocks and tools/armor made of iron, gold or chainmail. … Once an item and a fuel are placed into the blast furnace, the block state changes to lit and the item is smelted twice as fast as a regular furnace.
What is EAF and BOF?
There are two ways to make steel—in a Blast Furnace (BOF) or in an Electric Arc Furnace (EAF). In the U.S., approximately 75% of steel is made using the EAF method, and 25% is made by integrated mills using a basic oxygen furnace (BOF). … They melt iron ore in a Blast Furnace to produce liquid iron.
What is better than a blast furnace?
The Electric arc furnace is smaller and more efficient. … Managing the temperature within the system is easier than a blast furnace, making it more efficient. Another benefit of using the EAF process is that all types of steel can be created.
What is an electric arc furnace used for?
An electric arc furnace (EAF) is a furnace that heats material by means of an electric arc. Industrial arc furnaces range in size from small units of approximately one-tonne capacity (used in foundries for producing cast iron products) up to about 400-tonne units used for secondary steelmaking.
How is a blast furnace heated?
The blast furnace is a brick-lined, stainless steel stack, which is heated using pre-heated air. Limestone, coke and iron ore are placed in the blast furnace and heated. The coke, limestone and iron react in the presence of heat, producing slag and liquid iron.
Why coke is used in blast furnace?
Blast furnace ironmaking makes use of coke as the major source for both energy and reduction of iron oxides. In the blast furnace process, coke has multifunctions and plays an important role as reductant, burden support, and fuel. … Consumption of reducing agents and fuel in German blast furnace ironmaking .
Is a blast furnace BOF?
Integrated Blast Furnace (BF) and Basic Oxygen Furnace (BOF)
A blast furnace is the first process in manufacturing steel from iron ore, which is mined. Blast furnaces heat purified coal, or “coke,” limestone, and iron ore, then inject it with oxygen to reduce the carbon content and remove impurities.
What is EAF production?
The first electric arc furnaces (EAFs) appeared in the late 19th Century. The use of EAFs has expanded and now accounts for nearly 2/3 of steel production in the United States. The EAF is different from the blast furnace as it produces steel by using an electrical current to melt scrap steel and/or direct reduced iron.
What is DRI scrap?
Direct-reduced iron has about the same iron content as pig iron, typically 90–94% total iron (depending on the quality of the raw ore) so it is an excellent feedstock for the electric furnaces used by mini mills, allowing them to use lower grades of scrap for the rest of the charge or to produce higher grades of steel.
Do electric arc furnaces run continuously?
Moreover, EAFs can be operated intermittently, while a blast furnace is best operated at very constant rates. The electric power used in EAF operation, however, is high, at 360 to 600 kilowatt-hours per ton of steel, and the installed power system is substantial.
How much electricity does an electric arc furnace use?
Energy consumption varies from 350-700 kWh/ton of steel produced. The “typical” EAF without oxyfuel burners uses 475 kWh/ton.
What is the charge for the electric arc furnace?
Charging. The charge consists solely of scrap Steel and Iron. The top of the Furnace swivels to the side to allow the charge to be entered. The top of the Furnace is then put back in place and the Electrodes are lowered close to the surface of the metal, and the electric current is allowed to pass through.
How does electric arc furnace work?
Working Principle of Electrical Arc Furnace
The working of electric furnace includes charging the electrode, meltdown period (melting the metal) and refining. The heavy and light scrap in the large basket is preheated with the help of exhaust gas. … Then the arc is produced between the electrode and metal.
Who makes electric arc furnaces?
U. S. Steel today announced the successful start-up of its newly completed advanced electric arc furnace in Fairfield. The furnace represents a $412 million investment in the plant.
What is ARC in electric arc furnace?
Unlike the more primitive blast furnace, the electric arc furnace uses an electric arc to heat metals rather than induction from a secondary heat source. An electric arc is an electrical breakdown of a gas that produces electrical discharge between two electrodes with a large heat by-product.