A compound for forming a foamy slag layer for use in an electric arc furnace, is described. The electric arc furnace has a chamber for melting scrap steel and an opening for introducing material into the chamber. The compound has un-calcined dolomite ore having a weight percentage from about 10% to about 60% and carbon having a weight percentage from about 40% to about 90%. The un-caicined dolomite ore and carbon are introduced to the chamber of the electric arc furnace while the scrap steel is being melted to form a foamy slag layer on the surface of the molten steel.

A compound for forming a foamy slag layer for use in an electric arc furnace, is described. The electric arc furnace has a chamber for melting scrap steel and an opening for introducing material into the chamber. The compound has un-calcined dolomite ore having a weight percentage from about 10% to about 60% and carbon having a weight percentage from about 40% to about 90%. The un-caicined dolomite ore and carbon are introduced to the chamber of the electric arc furnace while the scrap steel is being melted to form a foamy slag layer on the surface of the molten steel.

A flash ironmaking drop tube furnace includes a primary reaction section having a refractory, an induction coil around the refractory, insulation located between the refractory and the induction coil, and a susceptor located inside the refractory, the susceptor being formed of a material that is heated by induction when electrical current flows through the induction coil, and having at least one interior channel through which particles can pass. The furnace further includes a muffle, located below the primary reaction section; an outer shell surrounding the muffle; at least one heater located adjacent to the muffle; insulation located between the at least one heater and the outer shell; at least one particle feeder that feeds a predetermined volume of particles into the furnace above the primary reaction section; and an inlet port for injecting gas into the furnace, the inlet port being located so that the gas flows through the susceptor and muffle in parallel with the particles.

Iron ore pellets including a core comprising iron ore, a first coating comprising lime, and a second coating comprising cement, wherein the first coating is disposed between a surface of the core and the second coating. A process for manufacturing the iron ore pellets whereby the first coating is applied to the core to form a coated core, the surface area coverage of the first coating is measured, the second coating is applied to the coated core, and the surface area coverage of the second coating is measure. A process for manufacturing reduced iron pellets is also provided whereby the iron ore pellets are reduced with a reducing gas at temperatures up to 1100 C.

Iron ore pellets including a core comprising iron ore, a first coating comprising lime, and a second coating comprising cement, wherein the first coating is disposed between a surface of the core and the second coating. A process for manufacturing the iron ore pellets whereby the first coating is applied to the core to form a coated core, the surface area coverage of the first coating is measured, the second coating is applied to the coated core, and the surface area coverage of the second coating is measure. A process for manufacturing reduced iron pellets is also provided whereby the iron ore pellets are reduced with a reducing gas at temperatures up to 1100 C.

A metallurgical furnace including a vessel, in turn having a lower shell for containing the metal bath, the metal bath being composed of molten metal and an overlying layer of slag, wherein the lower shell is tiltingly supported and is provided with a deslagging opening for evacuating the slag and with a tapping opening for tapping the molten metal, and an upper shell removably positioned on the lower shell and provided with at least one inlet opening for feeding, through the same, charge material in the solid state or in the molten state, a closing roof for the upper closing of the vessel, wherein the closing roof is removably positioned on the upper shell and is provided with a passage opening for the passage, through the same, of at least one electrode and at least one charge opening for feeding, through the same, charge material in the solid state, wherein at least one of the inlet openings, the passage opening, the charge opening is closed or can be associated with a closing element of the removable type, and wherein the lower shell has a diameter D and the vessel has an overall height H ranging from 0.70 D to 1.25 D, preferably ranging from 0.70 D to 0.80 D if the furnace is used as an electric arc furnace and from 0.80 D to 1.25 D if the furnace is used as a converter.

A metallurgical furnace including a vessel, in turn having a lower shell for containing the metal bath, the metal bath being composed of molten metal and an overlying layer of slag, wherein the lower shell is tiltingly supported and is provided with a deslagging opening for evacuating the slag and with a tapping opening for tapping the molten metal, and an upper shell removably positioned on the lower shell and provided with at least one inlet opening for feeding, through the same, charge material in the solid state or in the molten state, a closing roof for the upper closing of the vessel, wherein the closing roof is removably positioned on the upper shell and is provided with a passage opening for the passage, through the same, of at least one electrode and at least one charge opening for feeding, through the same, charge material in the solid state, wherein at least one of the inlet openings, the passage opening, the charge opening is closed or can be associated with a closing element of the removable type, and wherein the lower shell has a diameter D and the vessel has an overall height H ranging from 0.70 D to 1.25 D, preferably ranging from 0.70 D to 0.80 D if the furnace is used as an electric arc furnace and from 0.80 D to 1.25 D if the furnace is used as a converter.

An electric furnace with energy utilization efficiency at a low cost. In an electric furnace, a preheating chamber 2 with a melting chamber 1 is used to preheat iron scrap x, an exhaust gas generated in melting chamber 1 is passed through preheating chamber 2 filled with the iron scrap x to preheat the iron scrap x, the iron scrap x descends in the preheating chamber 2 to be supplied into melting chamber 1, and the iron scrap x is melted to obtain molten iron m. The iron scrap x is charged into preheating chamber 2 so that bulk density is not less than 0.50 t/m.sup.3 and less than 1.00 t/m.sup.3 and an iron scrap filling ratio H.sub.SC/H.sub.SF in the preheating chamber 2 is 0.5 to 0.8. A carbonaceous material is used for melting the iron scrap x, and oxygen and the carbonaceous material are blown into the melting chamber.

An electric furnace with energy utilization efficiency at a low cost. In an electric furnace, a preheating chamber 2 with a melting chamber 1 is used to preheat iron scrap x, an exhaust gas generated in melting chamber 1 is passed through preheating chamber 2 filled with the iron scrap x to preheat the iron scrap x, the iron scrap x descends in the preheating chamber 2 to be supplied into melting chamber 1, and the iron scrap x is melted to obtain molten iron m. The iron scrap x is charged into preheating chamber 2 so that bulk density is not less than 0.50 t/m.sup.3 and less than 1.00 t/m.sup.3 and an iron scrap filling ratio H.sub.SC/H.sub.SF in the preheating chamber 2 is 0.5 to 0.8. A carbonaceous material is used for melting the iron scrap x, and oxygen and the carbonaceous material are blown into the melting chamber.

This disclosure relates to an agglomerated stone for use in an electric furnace.