Patents Assigned to Societe Francaise D'Electrometallurgie
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Patent number: 4616690Abstract: The present invention concerns a process and an apparatus for moulding ingots of ferro-alloys by chill casting in a cooled copper mould.The apparatus comprises:an ingot mould (1) of copper, which is formed from two mould halves (2), at least one of which comprises a plurality of impressions (10) of the ingots to be moulded, communicating with each other by way of ducts (11, 12) and opening in the upper part by way of an ingate (18),means (5) for cooling each mould half (2) by a heat exchange fluid,means (9) for bringing the two mould halves into contact and into sealing relationship,means for moving the two mould halves away from each other, andmeans (7, 8) for guiding the mould halves in their movement away from each other and in their movement of coming into sealing relationship.Type: GrantFiled: September 6, 1984Date of Patent: October 14, 1986Assignee: Societe Francaise d'Electrometallurgie-SOFREMInventors: Michel Demange, Louis Septier
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Patent number: 4450003Abstract: The invention concerns a process for the recovery of combustible gases in an electrometallurgy furnace comprising an external metal casing (1) and an internal refractory lining (2), in which at least one oxidized compound is reduced by means of carbon, the various components being introduced into the furnace in the form of a divided charge (6) (A) which moves progressively downwardly towards the reaction region (C), passing through a sintering region (B). The combustible gases produced in the reaction region are collected by suction, by means of a plurality of apertures (8) provided in the external metal casing (1) and the internal refractory lining (2) and disposed at a level corresponding to the lower portion of the divided charge (A) and before it passes into the sintering region (B).Type: GrantFiled: November 1, 1982Date of Patent: May 22, 1984Assignee: Societe Francaise d'Electrometallurgie SofremInventors: Robert Herold, Francis Dubrous
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Patent number: 4417920Abstract: The invention concerns a process for eliminating metallic impurities from magnesium, in particular iron, silicon and manganese.For that purpose, a halogenated derivative of boron such as BCl.sub.3 is injected into the molten magnesium, in a proportion of from 0.05 to 5 kg of pure boron per tonne of magnesium. The magnesium may first be subjected to a refining operation using TiCl.sub.4 or a mixture comprising TiCl.sub.4 +FeCl.sub.3.The magnesium produced contains less than 1 ppm of residual boron, less than 20 ppm of Fe and Si and less than 30 ppm of Mn.Type: GrantFiled: November 2, 1982Date of Patent: November 29, 1983Assignee: Societe Francaise d'Electrometallurgie SofremInventors: Andre Mena, Jean-Michel Charriere, Jean Desbrest
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Patent number: 4405545Abstract: A method and apparatus is disclosed for rapidly solidifying and cooling molten metal oxides, by continuous casting, which according to the invention, comprises: feeding the molten metal oxides into the convergent space formed between two cylinders mounted for rotation about horizontal axes and rotated in opposite directions, i.e., counter-rotating, at a substantially equal peripheral speed, the distance between their axes being equal to the sum of the radius of each cylinder plus at least about one millimeter; cooling the walls of the cylinders to enable solidification of the molten material; controlling the rotary speed of the cylinders so that the molten metal oxide is not completely solidified until it reaches a point beyond a plane passing through the axes of rotation of the cylinders, and retrieving a solidified metal oxide product from the divergent space formed between the cylinders. The method is particularly suited to the production of fine grain abrasives of a corundum or courndum-zirconia base.Type: GrantFiled: January 26, 1982Date of Patent: September 20, 1983Assignee: Societe Francaise d'Electrometallurgie SofremInventors: Louis Septier, Michel Demange
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Patent number: 4364771Abstract: The invention relates to a process for the desulphurization of cast irons and steels.The product is constituted of the combination of magnesium shot or magnesium alloy with rounded contours having a granulometry of between 0.1 and 3 mm and a granulated slag having a basicity index higher than 1, containing alumina, lime, silica and magnesia, and optionally an additional flux having a granulometry of between 0.1 and 3 mm in a proportion ranging from 90 to 10% and preferably from 80 to 20% of magnesium shot and from 10 to 90% and preferably from 20 to 80% of granulated slag.Application to the desulphurization of forge pigs and foundry pig irons, to the nodularization of foundry pig irons by nozzle injection in a carrying gas stream into the liquid cast iron or steel.Type: GrantFiled: December 17, 1981Date of Patent: December 21, 1982Assignee: Societe Francaise d'Electrometallurgie SOFREMInventors: Jean Cordier, Michel Demange, Jean Idier
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Patent number: 4363657Abstract: The invention relates to a process for obtaining manganese- and silicon-based alloys by silico-thermal means in a ladle.An oxidized liquid slag, usually originating from earlier metallurgical operations and still containing from 10 to 40% of manganese in the form of MnO is treated by a silicon-based reducing alloy (silicon content of at least 60% and preferably at least 70%) with agitation.A slag which is substantially exhausted of manganese and a metal containing more than 60% and generally more than 70% of manganese and from 5 to 40% and preferably from 10 to 35% of silicon are thus obtained.Type: GrantFiled: March 6, 1981Date of Patent: December 14, 1982Assignee: Societe Francaise d'Electrometallurgie SofremInventors: Louis Boscaro, Michel Demange, Jean-Philippe Bucher, Francis Dubrous, Louis Septier
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Patent number: 4354868Abstract: The invention concerns a process of desiliconization of manganese alloys in the liquid state.By injecting carbon dioxide into the liquid alloy, which injection can be effected by an additional neutral gas, or oxidizing agent, the silicon is oxidized to SiO.sub.2. The addition of lime or dolomite favors the slagging of the silicon. By this process the silicon content can be as low as 0.1%.The process is particularly applicable for obtaining a ferromanganese with low carbon and low silicon content.Type: GrantFiled: August 11, 1980Date of Patent: October 19, 1982Assignee: Societe Francaise d'Electrometallurgie-SOFREMInventors: Michel Demange, Louis Septier
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Patent number: 4341533Abstract: The invention relates to a new class of high-hardness abrasive products and wear resistant parts based on alumina and aluminium oxycarbides. By fusing alumina in the presence of a carbonaceous substance and by controlled cooling, it is possible to obtain a large number of products in which the ratio .rho. of the number of carbon atoms to the number of carbon atoms plus oxygen atoms is between 0.01 and 0.50, and preferably between 0.02 and 0.20. These products are essentially constituted by primary alumina crystals in a eutectic matrix Al.sub.2 O.sub.3 - Al.sub.4 O.sub.4 C or Al.sub.2 O.sub.3 - Al.sub.2 OC.Type: GrantFiled: July 3, 1980Date of Patent: July 27, 1982Assignee: Societe Francaise D'Electrometallurgie-SofremInventors: Marc Daire, Yves Larrere, Andre Mangin
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Patent number: 4306904Abstract: A process for introducing into a metal bath an additive in the form of a solid shaped in the form of an elongate body portion having at least two vanes extending outwardly therefrom for a distance of not more than 40 mm with the vanes dimensioned and spaced one from the other to avoid interlocking thereby to enable the desired effect to be derived from the addition as rapidly as possible, including the shaped additive and method.Type: GrantFiled: April 6, 1979Date of Patent: December 22, 1981Assignee: Societe Francaise d'Electrometallurgie SofremInventors: Pierre Borgeaud, Andre Vilain
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Patent number: 4274871Abstract: The invention concerns a method of obtaining manganese alloys with an average carbon content by reacting liquid, carbon-containing ferro-manganese in a fluid tight chamber. Oxygen, mixed with a heat regulating gas such as CO.sub.2, air, nitrogen, argon or steam, is introduced and by controlling the discharge of the gaseous effluent, the pressure in the reactor is adjusted between 1.5 and 15 bars, to avoid volatilization of the manganese and a refined ferro-manganese is produced containing 0.5-2% carbon.Type: GrantFiled: December 31, 1979Date of Patent: June 23, 1981Assignee: Societe Francaise d'Electrometallurgie-SofremInventors: Michel Demange, Louis Septier
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Patent number: 4190434Abstract: This invention relates to the thermal production of magnesium, using, as source of magnesium oxide, a residual slag from the manufacture of certain carbon-containing chrome irons and, as reducing agent, a ferro-silico-aluminum for carrying out the MAGNETHERM process. Magnesium is obtained with a high degree of purity and in excellent yields, with the recovery of a residual alloy containing chromium and silicon, and the production capacity of a given furnace is increased by about 16% compared with that obtained when using calcined dolomite.Type: GrantFiled: June 14, 1978Date of Patent: February 26, 1980Assignee: Societe Francaise d'Electrometallurgie "Sofrem"Inventors: Rene Bonfils, Andre Mena, Christian Payn, Louis Septier
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Patent number: 4162916Abstract: The invention relates to a pyrometallurgical process for the treatment of complex metal ores, such as oceanic nodules, containing, in particular, manganese and copper, in which the ores are subjected to reducing fusion to produce a primary slag, containing all the manganese, and a primary alloy containing copper, nickel and cobalt. The primary slag which is then decoppered, may be used for the production of ferro or silicomanganese, while the secondary alloy is recycled for the reducing fusion step.Type: GrantFiled: March 27, 1978Date of Patent: July 31, 1979Assignee: Societe Francaise d'Electrometallurgie SofremInventors: Louis Septier, Francis Dubrous, Michel Demange
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Patent number: 4073641Abstract: An extraction process for nickel, easily reducible as an alloy or in pure state, starting from an ore which contains nickel in a small amount simultaneously with large quantities of other less reducible metals, the extraction being achieved by heating the ore and a reducing mass to a high temperature, the reducing mass being provided by a quantity of the reducer, calculated so as to reduce the totality of the nickel, the cobalt present if any, and a small part of another reducible constituent such as iron present in the ore, being dispersed, or dissolved, in a quantity of matter wherein the volume of the reducer is present in a charge of the reducible substance in a ratio of about 1:3.Type: GrantFiled: March 7, 1977Date of Patent: February 14, 1978Assignee: Societe Francaise d'ElectrometallurgieInventors: Jean Montanteme, Andre Greffe, Francois Grandjacques
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Patent number: 3954447Abstract: A process for reducing the degree of oxidation of a metal obtained by a production or purification operation wherein the metal is converted to the vapor state and then condensed to the liquid form in a vessel the lower part of which forms a crucible or pot in which it solidifes and in which a fusible flux is added to the metal in the crucible with a view to reducing the degree of oxidation, whereby the flux is added after previously being melted and the molten flux caused to penetrate into the void formed by contraction between the ingot and the inner wall of the crucible or pot.Type: GrantFiled: June 3, 1974Date of Patent: May 4, 1976Assignee: Societe Francaise D'ElectrometallurgieInventor: Guy Souchon
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Patent number: 3947542Abstract: A continuous process for extraction of niobium, rare earths and thorium from niobium ore concentrates which includes digesting the ore with a hot solution containing 13 to 16 moles of sulphuric acid per liter, diluting the solution to a concentration of 10 to 13 moles of sulphuric acid per liter, separating the insolubles from the solution which includes alkaline earth sulphates and the sulphates of thorium and rare earths that are present, reducing titanium in solution to the trivalent state and diluting the solution to a concentration of 5 to 7 moles of sulphuric acid per liter, separating the precipitated niobium oxide and sulphates of thorium and rare earths, and then concentrating the resulting solution to the level desired for recycle to the digestion stage.Type: GrantFiled: December 7, 1973Date of Patent: March 30, 1976Assignee: Societe Francaise D'ElectrometallurgieInventor: Gaston Charlot