Abstract: The present invention relates to an ironmaking feedstock comprising a solid CaFe3O5 phase. The ironmaking feedstock may be produced by a process comprising reacting a combination of a calcium source and magnetite at elevated temperature under reducing conditions sufficient to produce the solid CaFe3O5 phase. The product may be in the form of agglomerates such as pellets, with a compressive strength such that the product is suitable for transportation.

Abstract: A method of iron smelting in blast furnace with high temperature coal gas comprises the following steps: (1) charging raw materials consisting of pellets, basic sintered ore, coke and limestone into a blast furnace from top of the furnace, in which the amount of the coke is 125-210 kg per ton of molten iron, raw materials containing iron is composed of 90% pellets and 10% basic sintered ore, and ore grade is above 62%; (2) preheating coal gas to 1250-1450° C. with an horizontal high temperature blast heater, blowing the preheated coal gas having a thermal value of 11.7-12.5 mj/m3 into the blast furnace from top of the furnace at an amount of 1000 m3 per ton of molten iron and a pressure of 0.1-0.6 MPa; blowing air preheated to higher than 1250-1450° C. at an amount of 300-400 n m3 per ton of molten iron. The coal gas used in the method acts as a reducer and fuel, as a result the coke consumption would be reduced.

Abstract: In a method for producing pig iron using iron ore with a high content of zinc, a blast furnace raw material 2 is produced using iron ore with a high content of zinc which contains 0.01 mass % or more of zinc and 50 mass % or more of iron, pig iron is produced by charging the blast furnace raw material 2 into a blast furnace 1 and, at the same time, zinc-containing dust 4 in a blast furnace discharge gas is recovered, and zinc 6 is recovered from the zinc-containing dust 4 using a reduction furnace 5. A mixed raw material into which the zinc-containing dust 4, a carbonaceous solid reducing material and a slag-making material are mixed is preferably charged on a movable hearth, and the mixed raw material is preferably reduced by supplying heat from an upper portion of the movable hearth so as to recover zinc 6 while producing reduced iron 7.

Abstract: In a method of producing a reduced iron cast, a cast of a powder which includes total iron of 40% or more and an atomic molar amount of fixed carbon of 0.7 to 1.5 times the atomic molar amount of oxygen compounded with metal oxide reduced in a carbon monoxide atmosphere at 1200° C. is reduced in a rotary hearth furnace. The method includes: producing, in an atmosphere at a maximum temperature of 1200° C. to 1420° C. at a ratio of carbon monoxide to carbon dioxide of 0.3 to 1.2 in the reduced zone, a reduced iron-containing material in which a ratio of metal iron is 50 mass % or more and a ratio of carbon is 5 mass % or less; and compression-molding the reduced iron-containing material at a temperature of 500° C. to 800° C. by a roller-type mold.

Abstract: In a method of producing a reduced iron cast, a cast of a powder which includes total iron of 40% or more and an atomic molar amount of fixed carbon of 0.7 to 1.5 times the atomic molar amount of oxygen compounded with metal oxide reduced in a carbon monoxide atmosphere at 1200° C. is reduced in a rotary hearth furnace. The method includes: producing, in an atmosphere at a maximum temperature of 1200° C. to 1420° C. at a ratio of carbon monoxide to carbon dioxide of 0.3 to 1.2 in the reduced material, a reduced iron-containing material in which a ratio of metal iron is 50 mass % or more and a ratio of carbon is 5 mass % or less; and compression-molding the reduced iron-containing material at a temperature of 500° C. to 800° C. by a roller-type mold.

Abstract: The present invention relates to a method to improve the iron production rate in a blast furnace being charged by iron containing agglomerates. The method includes contacting the chargeable iron containing material with a slag modifying effective amount of a dispersion of a particulate material, wherein the contacting occurs prior to the charging of the agglomerate to blast furnace process.

Abstract: The invention relates to a process for producing pig iron or liquid primary steel products in a blast furnace, CO2 being substantially removed from at least a partial stream of a top gas emerging from a reduction shaft furnace (1), and this partial stream if appropriate being heated and being introduced into the blast furnace as reduction gas, and to a plant for carrying out this process, the top gas being introduced into the lower region of the blast-furnace shaft. This measure results in an improved energy balance and improved process management compared to the prior art.

Abstract: A method and a plant for manufacturing steel in an electric steel furnace wherein the electric steel furnace is charged with at most 70% scrap and with at most 60% liquid pig iron obtained in a mini-blast furnace, and optionally with additional iron carriers, and wherein the mini-blast furnace is operated for producing the pig iron with iron pellets and/or coarse or lump ore and coke as well as coal. The melting process in the electric steel furnace is operated using electrical energy and by simultaneously using oxygen and injected coal. The plant for carrying out the method is composed of a mini-blast furnace and an electric steel furnace.

Abstract: A method is provided for the disposal and utilization of sorted-out gas cylinders filled with fillers. The method is characterized in that the gas cylinders, together with the fillers contained therein, are supplied as charge in the degasified, opened condition as a whole or comminuted into large pieces, to an iron melting furnace, in particular a cupola furnace, a blast furnace or a rotary drum type furnace.

Abstract: Iron ore concentrate is converted to magnetic gamma hematite in an autogenous roasting operation which is self-sustaining. The iron ore concentrate is preheated and contained magnetite is oxidized to hematite. Hematite is reduced to magnetite using carbon monoxide. After cooling, the magnetite is oxidatively exothermically converted to magnetic gamma hematite. The thermal energy resulting from the latter step is recycled to the preheating and reduction steps while thermal energy resulting from the cooling step also is recycled to those steps. The magnetic gamma hematite may be subjected to magnetic separation to produce a very low silica high purity iron oxide concentrate, which may be blended with high silica concentrate to provide a pellet feed for making blast furnace feed pellets.

Abstract: Iron ore concentrate is converted to magnetic gamma hematite in an autogenous roasting operation which is self-sustaining. The iron ore concentrate is preheated and contained magnetite is oxidized to hematite. Hematite is reduced to magnetite using carbon monoxide. After cooling, the magnetite is oxidatively exothermically converted to magnetic gamma hematite. The thermal energy resulting from the latter step is recycled to the preheating and reduction steps while thermal energy resulting from the cooling step also is recycled to those steps. The magnetic gamma hematite may be subjected to magnetic separation to produce a very low silica high purity iron oxide concentrate, which may be blended with high silica concentrate to provide a pellet feed for making blast furnace feed pellets.

Abstract: An improved iron ore sinter for use in a blast furnace is made from a raw sinter mix comprising: iron-bearing materials; basic fluxes including a source of CaO and a source of MgO; and solid carbon-bearing material usually coke breeze, used as a heat-generating combustible. To produce the sinter, the raw sinter mix is subjected to a sintering treatment at a high temperature in order to cause the iron-bearing materials, fluxes and carbon-bearing material to agglomerate and sinter by incipient fusion; an air-cooling treatment in order to produce a hard lumpy substance having a porous cellular structure; and a mechanical treatment to break the lumpy substance into a specific size range. The improvement to the above sinter lies in that the source of MgO in the raw sinter mix exclusively consists of synthetic olivine obtained by calcination of serpentinite.

Abstract: A process for the reduction of iron oxides to produce molten iron in which olivine is introduced into a blast furnace in addition to iron oxide bearing materials and in which there is a high content of alkali metal oxides in the materials charged into the furnace, resulting in minimizing or preventing "scaffolding" and improving the operation of the furnace. The disclosure further includes improvements in which olivine is mixed with iron bearing materials or with coke and such mixture is formed into agglomerates having improved properties and in which such agglomerates are charged into the furnace.