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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. Arc furnaces used in research laboratories and by ...
The indirect arc electric furnace of the Stassano type, in its final configuration, is made from a cast iron cylindrical structure lined internally with refractory bricks. The structure is divided in two separate sections: an upper section where the electrodes are placed, and a lower crucible where the burden is loaded and fused into steel.
Electric arc furnaces (EAFs), which apply current to the metal via electrodes over an electric arc. The Flodin furnace is an early EAF, specially designed to smelt iron from ore through the direct addition of carbon; Electric induction furnaces, which heat the metal through eddy currents, requiring metal mostly free of gangue and corrosion
The Submerged-arc furnace for phosphorus production is a particular sub-type of electric arc furnace used to produce phosphorus and other products. Submerged arc furnaces are mainly used for the production of ferroalloys. The nomenclature submerged means that the furnace's electrodes are buried deep in the furnace burden.
[nb 2] On December 5, 1957, the Mexican company Hylsa started up the first industrial production unit of this type in Monterrey, with the pre-reduced ore obtained destined for smelting in an electric arc furnace. [nb 3] [4] As the production of pre-reduced ore with natural gas was economically viable, several plants were built in the late 1960s.
The floor of the furnace is mostly made of a different material from that of the wall, typically hard castable refractory to allow technicians to walk on its floor during maintenance. A furnace can be lit by a small pilot flame or in some older models, by hand. Most pilot flames nowadays are lit by an ignition transformer (much like a car's ...
Induction furnaces do not require an arc, as in an electric arc furnace, or combustion, as in a blast furnace. As a result, the temperature of the charge (the material entered into the furnace for heating, not to be confused with electric charge) is no higher than required to melt it; this can prevent the loss of valuable alloying elements. [5]
Plans, under the name “Operation SPEAR” (Steel Peech Electric Arc Reorganization), brought the most modern electric arc furnaces to the company, six of these replacing the 14 open hearth furnaces. When completed Templeborough Melting Shop became the world's largest electric arc steel making plant with a capability of producing 1.8 million ...