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| Number | Title | Issue Date |
| 6372013 | Carrier material and desulfurization agent for desulfurizing iron A particulate carrier material for use with particulate passivated magnesium for injection into molten iron to desulfurize the iron, improve characteristics of the slag and increase iron yield. Material flow of a transport gas and the carrier material is ... | 04/16/2002 |
| 5366539 | Process for the desulphurization treatment of pig iron melts The invention relates to a process for the desulphurization treatment of a pig iron melt in a container. The characterizing feature of the invention is that the treatment is performed in three phases: In the initial phase such solids are injected that deoxidiz... | 11/22/1994 |
| 5007958 | Lime-based injection powder for steel-refining A lime-based injection powder for use in steel-refining, having excellent waterproofing and desulphurization effects, consists of (a) more than 65% by weight of calcium oxide, (b) less than 30% by weight of fluorite, and 5-10% by weight of Al powder, 5%-7... | 04/16/1991 |
| 4970051 | Process for the introduction of nitrogen into cast iron The present invention provides an agent for the introduction of nitrogen into cast iron, wherein it contains or consists of at least 50% by weight of at least one nitrogen-containing compound with an N--C--N structure and/or a mixture of calcium cyanamide... | 11/13/1990 |
| 4874428 | Fluidizing a lime-silica slag A method of fluidizing a cold lime-silica slag covering a molten metal. An acid flux is prepared from a particulate admixture of sodium fluoroaluminate and sodium silicate. The flux is mixed with the cold slag forming a fluid slag having at least 1% by we... | 10/17/1989 |
| 4726839 | Process and an arrangement for the production of steel from sponge iron A process and an arrangement for the production of steel from sponge iron. In order to be able to process sponge iron with high contents of acid gangue and a phosphorus content of more than 3% in an economic and operationally safe manner, the following me... | 02/23/1988 |
| 4661151 | Treating agent for desulfurizing molten steels and method for treating molten steels A treating agent of molten steel according to the present invention is used for desulfurization molten steel for desulfurizing it in a reaction vessel which is lined with a basic refractory containing MgO, and consists of CaO, CaF2 and MgO and ... | 04/28/1987 |
| 4601749 | Method for adjusting chemical composition of molten pig iron tapped from blast furnace At least one lance is substantially vertically arranged above a hot-metal runner of a blast furnace so that the lowermost end of the lance is spaced apart by a prescribed distance from the surface of molten pig iron flowing through the hot-metal runner. A... | 07/22/1986 |
| 4592777 | Method, process and composition for desulfurizing pig-iron melts A method and composition for desulfurization of hot metal is disclosed. To the hot metal there is added a composition comprising calcium carbide, a hydrogen releasing compound and magnesium.... | 06/03/1986 |
| 4586955 | Process for desulphurizing hot metal The invention relates to a process for desulphurizing hot metal in a ladle, in particular in a torpedo ladle, wherein first aluminum and then, by means of a carrier gas, lime (CaO) are blown into the hot metal. The characterizing feature of the invention ... | 05/06/1986 |
| 4555265 | Method of treating steel with calcium, to obtain a steel well adapted to cold forming, with a low silicon content The invention concerns the production of steels which have an isotropic structure, are very well adapted to cold forming particularly by pressing and which have a very low silicon content. The method comprises taking a deoxidated liquid steel with a low silico... | 11/26/1985 |
| 4541617 | Lance structure for oxygen-blowing process in top-blown converters Herein disclosed is a lance structure for use with a top-blown converter. The lance structure is constructed to include a cylindrical sheath having a bottom wall and a flux supply tube disposed at the center of the sheath and defining a passage for carryi... | 09/17/1985 |
| 4518422 | Process and apparatus for refining steel in a metallurgical vessel A process and apparatus for the desulphurization, deoxidation and purification of a metal melt is presented. The process is particularly well suited for use in a ladle during the refining of steel. The present invention comprises means for defining at the... | 05/21/1985 |
| 4515630 | Process of continuously treating an alloy melt A process for continuously treating a ferrous or non-ferrous alloy melt is disclosed. The melt is transferred through a plurality of interconnected zones. The carbon content of the melt is lowered in a first treatment zone. Then, the residual oxygen conte... | 05/07/1985 |
| 4488903 | Rapid decarburization steelmaking process A decarburization procedure for rapidly decarburizing a steel melt comprising top injection of oxygen and powdered lime and bottom injection of oxygen and inert gas, discontinuance of the top injection at a specified time, and decarburization to the aim c... | 12/18/1984 |
| 4483710 | Addition agent for adding vanadium to iron base alloys Addition of vanadium to molten iron-base alloys using an agglomerated mixture of V2 O3 and calcium-bearing reducing agent. The mixture is added to the molten alloy by pneumatic injection with a carrier gas such as argon or nitrogen.... | 11/20/1984 |
| 4473398 | Method for desulfurizing a molten iron by injection Injection-desulfurization of a molten iron is carried out in a low cost by using powdery CaCO3 obtained by pulverizing limestone as a desulfurizing agent. This injection-desulfurization also can be attained by using a powdery mixture in which a... | 09/25/1984 |
| 4422873 | Blowing method in a top and bottom blowing converter The present invention belongs to a technical field in the oxygen steel making, more particularly in the steel making by blowing oxygen into a converter from its top and bottom. The total amount of oxygen to be blown into a top and bottom blowing converter... | 12/27/1983 |
| 4405363 | Method for refining of steel melts A method for refining of steel melts for production of steel, especially stainless steel, with extremely low oxygen content is characterized in that a powdered non-oxidic earth alkali metal compound or alloy is injected by means of a non-oxidizing carrier... | 09/20/1983 |
| 4392886 | Method of recovering CO-rich exhaust gas in refining of metal In order to enhance the CO concentration contained in exhaust gas generated during the refining of metal and to recover the CO as an energy source, granular limestone is blown into molten iron containing at least 0.3% of carbon through a tuyere together w... | 07/12/1983 |
| 4389245 | Lance ladling A method and apparatus for concurrent introduction of molten steel and gas-fluidized chemical steel additives, such as chemical desulphurants, into a teeming ladle 10. Injection apparatus includes a lance 52 arranged to remain with the vessel. Introductio... | 06/21/1983 |
| 4388112 | Steelmaking process with separate refining steps The present invention relates to a steelmaking process, in which the molten pig iron produced in a blast furnace is desiliconized, dephosphorized, decarburized and desulfurized. The characteristic of this invention is a sequence and combination of the ref... | 06/14/1983 |
| 4388113 | Method of preventing damage of an immersed tuyere of a decarburization furnace in steel making In bottom blown oxygen steel making or in top and bottom blown combined oxygen steel making, a tip end of a tuyer immersed in molten steel is seriously damaged or melted away due to very high temperatures due to the vigorous combustion of carbon, manganes... | 06/14/1983 |
| 4385753 | Tuyere for the simultaneous and separate introduction of at least one gas and one powder material Tuyere for the processing of metals in the liquid, solid or pasty state, and capable of introducing simultaneously and separately a gas and a powdered material. The tuyere comprises at least two well-centered concentric tubes, the gas being introduced int... | 05/31/1983 |
| 4358314 | Metal refining process A process for refining steel by top blowing with below melt tuyere injection in which at the commencement of the refining cycle the refining gas lance is located at a pre-determined height above the melt, and the gas flow rate to the below melt tuyere or ... | 11/09/1982 |
| 4356035 | Steelmaking process Oxygen is introduced onto the surface of a molten ferrous metal through at least one water-cooled lance disposed above the melt surface while an oxygen free gas in which is entrained ground solids is intermittently introduced into the molten ferrous metal... | 10/26/1982 |
| 4347078 | Process and apparatus for the desulfurizing of iron melts A desulphurizing agent is blown into a metallurgical converter from a storage bin which is connected over a vane type bilowthrough feeder. Variable amounts of desulphurizing agents are fed through the inlet by margin the rotational speed of the vanes.... | 08/31/1982 |
| 4308056 | Method and apparatus for introducing solid substances into liquid metals Solid substances are introduced into a bath of molten metal by pushing a hollow metal tube filled with the solid substance, through a tubular former that imparts a spiral shape to the carrier tube. The spiral rotates about a vertical axis as it descends i... | 12/29/1981 |
| 4308057 | Steel making by converter Steel making by a converter comprises blowing oxygen onto the surface of molten steel held in the converter and blowing agitating gases of 1/3 to 1/3000 of the amount of said oxygen thereinto from tuyeres provided at bottom of the converter, which number ... | 12/29/1981 |
| 4302244 | Steel conversion method A steel conversion method includes the steps of delivering a first quantity of oxygen and a surrounding sheath of hydrocarbon shielding fluid beneath the level of a quantity of molten ferrous metal or bath contained in a vessel by means of bottom tuyeres ... | 11/24/1981 |
| 4298192 | Method of introducing powdered reagents into molten metals and apparatus for effecting same A method of introducing powdered reagents into a molten metal in a stream of carrier gas through a tuyere disposed in a refractory lining of a metallurgical vessel, consisting in that powdered reagents are introduced into a molten metal at a feed rate of ... | 11/03/1981 |
| 4290802 | Steel making process An oxygen top-blowing steelmaking process is disclosed, which comprises preparing a molten metal suitable for producing steel in a basic oxygen furnace, carrying out the top-blowing and bottom-blowing and then tapping the resulting molten steel. The botto... | 09/22/1981 |
| 4277279 | Method and apparatus for dispensing a fluidized stream of particulate material Method and apparatus for dispensing a fluidized stream of particulate material, particularly a blended mixture of particulate materials which are useful in the desulfurization of molten ferrous metals. Control of the flow rates of the particulate material... | 07/07/1981 |
| 4272286 | Metallurgical vessel A metallurgical vessel has releasably coupled, semicylindrical upper and lower sections arranged such that the axis of revolution of one section lies in a plane normal relative to the rotational axis of the other. The dimension of each section in the axia... | 06/09/1981 |
| 4261735 | Injection-metallurgical process In an injection-metallurgical process performed in a ladle, lime is injected during a first phase after the deoxidation, removing the main part of the sulphur existing in the melt. During a second phase thereafter calcium-silicon, calcium-carbide or calci... | 04/14/1981 |
| 4211553 | Method of refining of melts by means of a pulverous solid material and/or a gas A method and an apparatus for refining a melt by means of a pulverous solid material and a carrier gas, in which the pulverous solid material and gas are injected into a reactor while melt is poured into the reactor, the kinetic energy of the melt created... | 07/08/1980 |
| 4198230 | Steelmaking process A steelmaking process is described in which solid sources of iron (e.g. scrap) are charged into a convertor equipped with tuyeres through which air, oxygen or mixtures thereof can be blown into the convertor. The process includes (1) a preheating phase in whic... | 04/15/1980 |
| 4190435 | Process for the production of ferro alloys A process for the production of ferro alloys containing manganese, chromium, molybdenum, and small amounts of carbon is provided. To a converter having a previous product melt and a slag rich in oxides of chromium or manganese is added a reducing agent ha... | 02/26/1980 |
| 4165980 | Method of rapidly decarburizing ferro- alloys with oxygen The invention relates to a method of rapidly decarburizing a high-carbon ro-alloy with oxygen for avoiding an undesirable oxidation of the principal alloying elements, especially chromium or manganese, comprising blowing an oxidizing gas under the surfac... | 08/28/1979 |
| 4139368 | Metallurgical method A method of treating ferrous metal in a metallurgical vessel having a plurality of two-pipe tuyeres extending generally upwardly through the vessel bottom and in spaced apart relation relative to each other. A flux, such as line, is first blown into the f... | 02/13/1979 |
