Abstract: The method of reduction processing of steel-making slag, includes: a hot steel-making slag inflow process of continuously or intermittently charging, from a slag supplying container, hot steel-making slag to a molten slag layer on a molten iron contained in an electric furnace while adjusting an amount of inflow with the slag supplying container; a reducing agent supplying process of supplying a reducing agent to the molten slag layer; an electrifying and heating process of heating the molten iron and the molten slag layer through application of electric power; and a reduction process of continuing reduction processing of the hot steel-making slag in a non-oxidizing atmosphere while intermittently discharging either one or both of the molten iron or molten slag of the molten slag layer.

Abstract: The present invention describes an inoculation process for inoculating a nucleating additive to a cast iron alloy in a pouring distributor by means of using a transferred arc plasma torch, with an anode partially immersed in the cast iron alloy and a cathode located on the surface of said alloy, the anode or the cathode or both comprising graphite, preferably synthetic crystalline graphite, which supplies said nucleating additive to the iron alloy. The invention thus describes an inoculation device useful for carrying out the inoculation process.

Abstract: Efficient coordination of processing (by desulphurizing) and moving hot metal from a direct smelter, producing hot metal on a continuous basis, to an electric arc furnace or furnaces, operating on a batch basis, is disclosed. The invention includes the use of hot metal storage devices, such as ladles, that are large enough to supply hot metal for a small number, preferably two or three, of electric arc furnace batch operations.

Abstract: A method for producing a ferro-alloy in an electric arc furnace is disclosed. The method comprises the step of charging the furnace with an un-agglomerated carbon-containing polymer such that the polymer functions as a slag foaming agent.

Abstract: A method of using scrap rubber, such as tires or parts of tires, to manufacture or melt steel and other metals includes inserting into a furnace at a more precise and controlled rate, time, and location the scrap rubber. The controlled rate of insertion into the furnace, as opposed to batch feeding them, permits the use of larger quantities of scrap rubber. The net benefit includes reducing the amount of scrap rubber, such as tires, to be sent to a waste disposal facility or landfill, thereby improving the environment. In addition, by increasing the use of scrap rubber as a source of energy for steel or the metal production, less energy is required from other sources. The invention further allows the scrap rubber to be put into the furnace separate from the scrap metal that is also to be put into the furnace, thereby eliminating the known methods and techniques of combining of the scrap rubber with the steel or scrap metal prior to the placement of the scrap rubber and scrap metal into the furnace.

Abstract: A method for producing an iron oxide pellet including the steps of adding water to a raw material mixture comprising iron oxide which serves as a primary component, a carbonaceous material in an amount sufficient for reducing the iron oxide, an organic binder in an amount sufficient for binding the iron oxide and the carbonaceous material, and an inorganic coagulant in an amount of not less than 0.05 mass % and less than 1 mass %; pelletizing the resultant mixture to thereby obtain a green pellet; and drying the green pellet until the moisture content is reduced to equal to or less than 1.0 mass %. The thus-produced iron oxide pellet is charged in a reducing furnace for reduction to thereby obtain a reduced iron pellet.

Abstract: The state of slag foaming generated in an electric furnace steel manufacture is judged by measuring the NOx amount in exhaust gas. The foaming state is adjusted to completely interrupt the contact of melted steel with air so that low nitrogen of the steel is always achieved or reduction of electric power consumption rate is achieved. Thus, in the manufacture of steel by subjecting iron scrap to dissolving, refining and heating stages successively in an electric arc furnace, the NOx amount in the exhaust gas is measured at the refining and heating stages of the melted steel and then the state of the slag foaming is judged depending upon the measured data.

Abstract: This invention relates to a method for operation of a rotary hearth furnace in conjunction with an electric melter for production of high purity iron product having a range of silicon and manganese, with low sulfur and phosphorus content. The method includes producing high purity iron product and a range of carbon content product from iron oxide and carbon bearing compacts, including the steps of providing a furnace for direct reduction of iron oxide and carbon bearing compacts, pre-reducing iron and carbon bearing compacts in a furnace having a rotary hearth surface, producing intermediate carbon-containing metallized iron. An electric melter furnace is utilized for receiving intermediate carbon-containing metallized iron from the pre-reducing step, which is fed directly and continuously into a central interior area of the electric melter, with heating of the carbon-containing metallized iron in the electric melter under elevated temperatures of about 1300° C. to about 1700° C.