Patents by Inventor Francois Schleimer
Francois Schleimer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 4767036Abstract: An apparatus and method is presented for emptying metallurgical vessels, and in particular steelmaking converters containing metal and slag, whereby the slag is effectively separated from the metal during pouring. The apparatus includes at least on permeable refractory element located near the flow hole. An agitating gas is fed through the refractory element thereby creating a bubbling froth which effectively obstructs most of the slag from being carried along by the vortex which forms above the vertical flow hole.Type: GrantFiled: June 17, 1983Date of Patent: August 30, 1988Assignee: Arbed S.A.Inventors: Francois Schleimer, Jean Goedert, Ferdinand Goedert, Romain Henrion, Fernand Thill, Henri Klein, Jean-Francois Liesch
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Patent number: 4675049Abstract: A process for producing high quality steel includes a first step of decarburizing the melt in a converter by top blowing with oxygen to a carbon content of less than 0.1% carbon. Next, carbon (comminuted coal) is delivered to the melt at a high velocity whereby the melt and slag will boil intensely with the carbon being delivered until the oxygen content of the melt is less than or equal to about 250-400 ppm oxygen and the carbon content is greater than or equal to about 0.04-0.07% carbon. In the third step, recarburization of the melt is effected in either the converter or a ladle whereupon a melt having as little oxygen as is reasonably possible; and a carbon content close to that desired is achieved. Finally, in a fourth step, the melt (which is now in a ladle) is treated with synthetic slag and with a material that is both deoxidizing and desulphurizing (i.e., metallic calcium) whereby a high quality steel is produced.Type: GrantFiled: June 4, 1986Date of Patent: June 23, 1987Assignee: Arbed S.A.Inventor: Francois Schleimer
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Patent number: 4603810Abstract: A method and apparatus for accelerating solid particles entrained in a carrier gas so as to maximize the velocity of the particles at the output end of a duct is presented. This maximized or optimal acceleration is achieved by varying the cross section of the duct over at least the last 5 meters upstream from the opening thereof. Preferrably, the cross section of the duct should continuously increase i.e. diverge, towards the opening. This diverging cross section is preferrably in accordance with a nonlinear function of the length.Type: GrantFiled: March 8, 1984Date of Patent: August 5, 1986Assignee: Arbed S.A.Inventors: Francois Schleimer, Clement Burton, Andre Bock, Jean Peckels
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Patent number: 4561637Abstract: A process and apparatus for heating a steel bath charged with scrap which efficiently utilizes converter waste gas to supplement external energy sources is presented.Type: GrantFiled: September 23, 1983Date of Patent: December 31, 1985Assignee: Arbed S.A.Inventor: Francois Schleimer
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Patent number: 4469510Abstract: A method of producing molten iron in which iron oxide is fed together with carbon to an oxygen-top-blown melt from below through blocks whose pores permit the particles to be entrained into the melt in a carrier gas, the pores preventing penetration of the molten metal.Type: GrantFiled: April 21, 1982Date of Patent: September 4, 1984Assignee: Arbed S.A.Inventors: Paul Metz, Edouard Legille, Francois Schleimer, Antoine Weiner
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Patent number: 4439234Abstract: Pig iron is refined by top blowing with oxygen and injecting inert gas from the bottom. The slag formation is minimized by controlled addition of lime to match the formation of slag components as they are generated by the process. This increases the capacity of the melt to receive a cold charge, e.g. of scrap.Type: GrantFiled: February 16, 1983Date of Patent: March 27, 1984Assignee: Arbed S.A.Inventors: Francois Schleimer, Romain Henrion, Ferdinand Goedert, Fernand Thill
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Patent number: 4434005Abstract: A method of and an apparatus for the refining of a molten metal overlain by a slag and in which cold solids are introduced, e.g. in the form of metal scrap. According to the invention the heat necessary to melt the scrap and prevent undue cooling of the bath is generated by directing a jet of neutral gas entraining carbon against the surface of the melt perpendicularly thereto at Mach 1.5 to Mach 2.5, while refining oxygen is directed at the surface from jets inclined to the carbon entraining jet and the melt is bottomblown by neutral gas to prevent excessive foaming of the slag.Type: GrantFiled: November 29, 1982Date of Patent: February 28, 1984Assignee: Arbed S. A. (Luxembourg)Inventors: Paul Metz, Francois Schleimer, Ferdinand Goedert, Romain Henrion, Henri Klein, Jean-Francois Liesch
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Patent number: 4421555Abstract: A system for treating, normally refining, a metallurgical melt has a melt-containing vessel having below the level of the melt an at least gas-pervious wall portion. A finely divided treatment solids is suspended in a treatment gas and this suspension is introduced through the pervious wall portion into the melt and reacting the melt with the gas and solids. The wall portion has openings oriented so that the gases and particles can pass into the vessel through them, but the molten metal therein cannot enter them. A plurality of such gas-and particle-pervious inserts are provided in the base of the crucible. They can be individually controlled relative to respective sensors provided above the melt. Thus exothermically reacting gases and/or particles are fed in under cold spots, or endothermically reacting gases and/or particles are fed in under hot spots.Type: GrantFiled: March 22, 1982Date of Patent: December 20, 1983Assignee: Arbed S.A.Inventors: Paul Metz, Edouard Legille, Francois Schleimer, Antoine Weiner
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Patent number: 4415358Abstract: A melt is contained in a vessel having below the level of the melt an at least gas-pervious wall portion. First the slag is removed, normally by pouring it off, from the melt. Then a finely divided treatment solids suspended in a gas is introduced through the wall portion into the melt. The melt reacts thoroughly with these solids. Immediately deslagging the melt substantially reduces its ability to pick up nitrogen or hydrogen. This can be enhanced by the further step, prior to introduction of the suspension, of adding pure lime to the melt to form a protective layer thereon. The vehicle gas for the powder of course is inert, normally argon. The vessel can also be sealed up with a tight cover after addition of pure lime to it and before introduction of the suspension. Otherwise in the subsequent desulfurizing nitrogen and hydrogen will enter into the metal matrix, especially if there is an appropriate slag present.Type: GrantFiled: April 23, 1982Date of Patent: November 15, 1983Assignee: Arbed S.A.Inventors: Paul Metz, Francois Schleimer, Edouard Legille, Jean Goedert, Antoine Weiner
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Patent number: 4378106Abstract: A refractory gas permeable structural unit for blowing a gas into a metal treatment container and through its casing, has a refractory gas permeable stone, a first metal housing sealingly surrounding the stone, a second metal housing arranged at a distance from the first metal housing, a refractory substantially gas impermeable filler material provided between the first and second metal housings, and at least one connection and a distribution chamber provided at the end face of the stone.Type: GrantFiled: July 6, 1981Date of Patent: March 29, 1983Assignee: Arbed S.A.Inventors: Bruno Hirschberg, Francois Schleimer
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Patent number: 4369060Abstract: Process of refining of a metal bath in a crucible with oxygen blast at the top and crucible used.The invention consists essentially of providing in the bottom (15) of the crucible agitating gas injectors (15) located at least in a peripheral circular ring situated in immediate proximity to the refractory side wall. The injectors are preferably concentrated opposite the journals. Secondary injectors are, also preferably, provided in the bottom zone, intermediate between the ring and the center of the crucible.The invention makes it possible, in relation to the prior injection practice, to reduce the rate of dissolution of the agitating gas in the molten metal and then makes it possible to use a low-cost agitating gas, such as nitrogen, without risk of excessive nitridation of the bath.Type: GrantFiled: January 2, 1981Date of Patent: January 18, 1983Assignees: Arbed S.A., IrsidInventors: Paul Metz, Francois Schleimer, Ferdinand Goedert, Lucien Lorang, Romain Henrion, Jean-Claude Grosjean, Guy Denier, Claude Bauler
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Patent number: 4349382Abstract: A process for refining a metal bath in a converter by oxygen blowing, particularly a molten metal liquid bath containing cold, solid substances, notably of scrap. Oxygen is distributed over the surface of the bath, so that there will be an after-combustion of CO released in the course of decarbonization. The thickness and consistency of a slag layer formed over the bath is actively regulated by injecting a rising inert gas through the bottom of the bath. The flow of rising gas may be regulated depending upon the oxygen content in the fumes of the converter, or upon the intensity of emission through the top of an oxygen blowing lance.Type: GrantFiled: April 28, 1980Date of Patent: September 14, 1982Assignee: Arbed S.A.Inventors: Francois Schleimer, Romain Henrion, Ferdinand Goedert, Lucien Lorang
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Patent number: 4345746Abstract: A ferrous melt, e.g. of steel, is refined beneath a slag layer by blowing from above with an oxygen-containing gas through a lance and by bubbling an inert gas through the melt from the bottom. According to the invention, the consistency of the slag layer and/or its level is continuously detected on the one hand and the rate of decarburation of the bath is detected on the other hand and in response to these measurements the volume rate of flow of the bubbling gas is controlled on the one hand to maintain a predetermined spacing of the slag layer from the head of the lance and, on the other hand, a fluid consistency of the slag.Type: GrantFiled: May 4, 1981Date of Patent: August 24, 1982Assignee: Arbed S.A.Inventors: Francois Schleimer, Romain Henrion, Ferdinand Goedert, Lucien Lorang, Jean Baumert
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Patent number: 4334922Abstract: A process for refining a steel melt in a furnace in which a steel melt is formed with a slag layer thereon, the thickness of which can be controlled by passing a stream of inert gas upwardly through the melt, while directing a first stream of oxygen into the melt from a lance positioned above the melt for the top-blowing refining thereof to produce carbon monoxide above the melt and feeding a second stream of oxygen from the lance for the post-combustion of the released carbon monoxide, while monitoring continuously the thickness of the slag layer, the height of the melt, the carbon monoxide post-combustion factor (%CO.sub.2 /%CO+%CO.sub.2) and the speed of decarburization of the melt and controlling the height of the lance above the melt and the discharge rates of total blown oxygen, the second stream of oxygen and the inert gas stream at any given time in accordance with a particular relationship.Type: GrantFiled: January 5, 1981Date of Patent: June 15, 1982Assignee: ARBED S.A.Inventors: Paul Metz, Francois Schleimer, Lucien Lorang, Ferdinand Goedert, Romain Henrion, Fernand Thill
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Patent number: 4325730Abstract: Slag is conditioned during blowing from above with oxygen of an iron melt by bubbling an inert gas into the melt from the bottom of the crucible in response to measurements made of the flowability of the slag layer and the speed of decarburization.Type: GrantFiled: November 6, 1980Date of Patent: April 20, 1982Assignee: Arbed S.A.Inventors: Francois Schleimer, Romain Henrion, Ferdinand Goedert, Lucien Lorang, Jean Baumert