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| Number | Title | Issue Date |
| 7175690 | Pre-treatment process for feed material for direct reduction process A pretreatment process for solid lump feed material for a gas and pellet/lump-based direct reduction process, comprising preheating feed material to a temperature of from about 200 C to about 500 C, without reduction, in a non-reducing atmosphere prior to charging t... | 02/13/2007 |
| 6293991 | Process for producing liquid pig iron comprising recirculating agglomerated sludges In a method of producing molten pig iron (13) or molten steel pre-products from charging substances formed of iron ore (4), preferably in the shape of lumps and/or pellets, and optionally of fluxes (5), the charging substances are directly reduced to spon... | 09/25/2001 |
| 6241808 | Production of iron ore pellets A process for producing fired pellets by granulating finely-ground iron ore and subjecting the resulting granules sequentially to drying, dehydration, preheating, and firing, wherein said process comprises adding an additive to said finely-ground iron ore... | 06/05/2001 |
| 6149712 | Sintered high titanium agglomerates A process for increasing the particles size of fines of a titaniferous mineral containing more that 45% by weight of titanium. The process comprises mixing the fines with a binding agent and water to produce an agglomerate. The agglomerate is then dried a... | 11/21/2000 |
| 5858525 | Synthetic gasket materials for use in high-pressure presses A synthetic gasket material for use in a high-pressure press includes a major proportion of clay mineral powder having sufficient lubricity to flow in a high-pressure press, a minor proportion of at least one hard material powder having a sufficiently gre... | 01/12/1999 |
| 5756162 | Method for manufacturing sendust core powder A method for manufacturing a powder for sendust core is disclosed which is used in power supplies, converters and invertors, and in which the sendust powder is manufactured by applying the atomizing process, and the powder is coated with a special ceramic... | 05/26/1998 |
| 5385602 | Agglomerating by extrusion A process for agglomerating by extrusion, metallurgical by-products and waste products having small particle size, is described. A blend of metallurgical by-products, some of which contain silicates previously treated at high temperatures and thereby bein... | 01/31/1995 |
| 5221320 | Controlling deposits in the calcination of fluxed iron ore pellets A stable aqueous suspension of a mixture of magnesium hydroxide and copper oxychloride, together with a suspending agent, is used to reduce deposits in kilns or furnaces used to make iron ore agglomerates, known as pellets, during a calcination process in... | 06/22/1993 |
| 5127940 | Self-fluxing pellets to be charged into blast furnace, and method for producing same Disclosed herein is a self-fluxing pellet to be charged into blast furnace, the pellets containing open pores of diameters larger than 5 μm in an amount greater than 0.045 cm3 /g. Calcium.ferrite structures with a thickness of 100 μm or great... | 07/07/1992 |
| 4814005 | Flux material for steelmaking A fused, hardened composition containing CaO, MgO and Al2 O3 for use in purifying molten metal during steel production and a method of making the same. The composition can be made up of electric arc furnace dust and lime or dolo-lime... | 03/21/1989 |
| 4657584 | Effect of MgO source on sinter properties A process is provided for sintering iron-bearing particulate materials in which the final sinter contains 3/5.5% MgO, yet has substantially the same strength as a low MgO limestone sinter. At least 20% of the MgO in the final sinter product must come from... | 04/14/1987 |
| 4533384 | Process for preparing binder-free hot-briquets The invention relates to a process and an apparatus for preparing binder-free hot-briquets for smelting purposes from ferrous pyrophorous, finely divided solids, such as dry steelmaking-filter dust or slightly granular sponge iron from direct-reduction pl... | 08/06/1985 |
| 4528029 | Self-reducing iron oxide agglomerates Self-reducing agglomerates of an iron oxide-containing material, such as an iron ore concentrate, having a compressive strength of at least about 100 lbs. are produced by preparing a moistened mixture of the ore concentrate, a finely-divided natural pyrol... | 07/09/1985 |
| 4451293 | Slag-forming agent and process for producing the agent A slag-forming agent comprising an aggregate of particulate material having a maximum diameter of 3.0 millimeters and containing at least 15 weight percent magnesium oxide, the aggregate being coated with from 5 to 20 weight percent cement, and a process ... | 05/29/1984 |
| 4435210 | Refining agent of molten metal and methods for producing the same The present invention relates to a refining agent used for deoxidation, desulfurization, and dephosphorization of molten steel by a ladle refining, as well as methods for producing such a refining agent. The general practice in ladle refining is to use fo... | 03/06/1984 |
| 4367091 | Fired iron-ore pellets having at least two different precipitated slag phases and process for producing the same Fired iron-ore pellets are prepared which have at least two precipitated slag phases of different chemical compositions which appear among the iron-oxide grains of the pellets. The pellets each contain not less than 4% by weight of CaO+SiO2 so ... | 01/04/1983 |
| 4326887 | Basic process of producing basic fluxed pellets for iron-making A new fluxed pellet for use in iron-making is obtained by mixing and indurating about 1 to about 20%, by weight of the pellet, of ground melt shop slag fines with similarly ground iron ore concentrate, so as to achieve particular ranges of silica content,... | 04/27/1982 |
| 4323392 | Agent for desulfurizing crude iron and steel melts, and process for making it The invention provides an agent for desulfurizing crude iron and steel melts, the desulfurizing agent being based on calcium carbide containing calcium oxide. The desulfurizing agent is produced by admixing a calcium carbide melt having up to 45 weight % ... | 04/06/1982 |
| 4129437 | Iron ore pellet having a specific shape and a method of making the same In the present invention, after a powdered iron ore has been subjected to granulation and firing into spherical pellets, a further crushing is applied while adjustment of the particle size of the crushed pellets is made so that the outer surface of the pe... | 12/12/1978 |
| 4116681 | Process for the manufacture of ore pellets Ore pellets of homogeneous composition and loose consistency, free of pellet germs and having a reduced content of adhesive, are formed by dry mixing ore powder of particle size less than 90 microns (preferably about 65% less than 40 microns), with a mois... | 09/26/1978 |
| 4093448 | Method of producing pellets from ore concentrates The present invention relates to ore lumping processes in ferrous metallurgy and can be most efficiently utilized in non-roasting methods of producing pellets from iron ore concentrates with moisture content of 7 to 15%. The given method of producing pell... | 06/06/1978 |
| 4071595 | Method of forming fluorite briquettes A method of forming fluorite briquettes from a fluorite flotation concentrate wherein the fine dry powder of the fluid concentrate is preheated, briquetted under pressure and fired after the formation of the briquettes to form solid dust free briquettes.... | 01/31/1978 |
| 4063930 | Preparation of weatherable ferrite agglomerate A weatherable ferrite agglomerate is prepared by establishing compacted or other coherent bodies consisting of a mixture of fine particles of lime and of iron oxide, and heating the bodies, in a reducing atmosphere, at a suitable temperature up to about 2... | 12/20/1977 |
| 4049435 | Method for obtaining a lump product The proposed method relates to preparation of ores and is intended for production of pellets and briquettes with use being made of mineral hydraulic binders. This method comprises mixing an ore with a mineral hydraulic binder, the mixture obtained is simu... | 09/20/1977 |
| 4043831 | Densification of coal fly ash Densified fly ash pellets are produced by the steps comprising: A. Sizing the fly ash to produce a fraction substantially finer than -200 mesh (U.S. Standard); B. Moistening the sized fraction with sufficient water to form green pellets; C. Sizing the green pe... | 08/23/1977 |
| 4043803 | Process for the manufacture of a compacted synthetic flux based on calcium fluoride A process for producing a compacted calcium fluoride based synthetic flux from an aqueous effluent containing fluorine ions, by precipitating fluorine ions as calcium fluoride, reducing the water content of the precipitate to the range from about 10 perce... | 08/23/1977 |
| 3999978 | Method for making steel by the use of a flux treated by carbon dioxide A quicklime is treated by CO2 gas so as to form a CaCO3 film on the surface of the particle thereof. It serves to prevent moisture absorption so that a steel making process, especially for the production of low hydrogen steel, can be... | 12/28/1976 |
| 3980465 | Process for producing iron ore oxidized pellets from magnetite concentrate Iron-ore oxidized pellets are produced from magnetite concentrate by the addition to the magnetite concentrate of at least one calcium compound selected from the group consisting of slaked lime, quicklime and limestone, to a basicity of 1 to 5, granulatin... | 09/14/1976 |
| 3975182 | Pellets useful in shaft furnace direct reduction and method of making same Iron ore or concentrates containing about 0.5 to about 3.0% silica, 0.5 to 1.0% bentonite and 96.5 to 99.0% iron oxide together with 7.0 to 12.0% moisture is pelletized, the pellets are surface-coated with about 1 to about 4.5% limestone and fired at a te... | 08/17/1976 |
| 3975183 | Use of alkali metal silicates to reduce particulate emissions in sintering operations Particulate matter common to sintering operations can be substantially reduced by the addition to the sinter mix prior to fusion of an alkali metal or ammonium silicate.... | 08/17/1976 |
