Paul Wurth S.a.

Paul Worth S.a.

Jean-Luc Roth

Emile Lonardi

Marc Solvi

Jean-Paul Simoes

Henri Radoux

Guy Denier

Romain Frieden

Thomas Hansmann

Jean Monai

Ludivine Piezanowski

Hubert Stomp

Alain Laudet

Serge Devillet

Marc Pelletier

Albert Feitler

Fred Parasch

Wilhelm Burgmann

Paul Berg

Andr&eacute; Kremer

Fred Weisgerber

Marie Bontemps

Christophe Solver

L&eacute;on Ulveling

The present invention proposes a method for feeding hot gas to a shaft furnace (), wherein the method comprises feeding a first portion () of a first gas flow () to a mixing chamber () and feeding a second portion () of the first gas flow () into said shaft furnace. The method further comprises feeding a second gas flow () to the mixing chamber (), allowing the first portion () of the first gas flow () to mix with the second gas flow () in the mixing chamber (), thereby forming a third gas flow (), and feeding the third gas flow () to the shaft furnace (). The first gas flow () has a first volumetric fluid flow rate (V), a first temperature (T) and a first pressure (p); the second gas flow () has a second volumetric fluid flow rate (V), a second temperature (T) and a second pressure (p); and the third gas flow () has a third volumetric fluid flow rate (V), a third temperature (T) and a third pressure (p). According to an important aspect of the present invention, the first temperature (T) is higher than the second temperature (T) and the first pressure (p) is lower than the second pressure (p) and the third temperature (T) is regulated by controlling the second pressure (p).

Method for feeding hot gas to a shaft furnace

A method for operating a blast furnace and a corresponding blast furnace, the method including recovering top gas from the blast furnace, submitting at least a portion of the top gas to a recycling process, and feeding the recycled top gas back into the blast furnace, where the recycling process includes feeding the recovered top gas to a reformer unit, feeding volatile carbon containing material to the reformer unit, proceeding to flash gasification of the volatile carbon containing material in the reformer unit, at a temperature between 1100 and 1300&#xb0; C., and thereby producing devolatized carbonaceous material and synthesis gas, and allowing the devolatized carbonaceous material and synthesis gas to react with the recovered top gas.

Method for operating a blast furnace and blast furnace installation

The present invention describes a method for treating residues comprising zinc ferrites and non-ferrous metals selected from among the group made up of lead (Pb), silver (Ag), indium (In), germanium (Ge) and gallium (Ga) or mixtures thereof in the form of oxides and sulfates, comprising the following steps:

Method for the valorisation of zinc-and sulphate-rich residue

A process for recovering non-ferrous metals, in particular copper, nickel and cobalt, from metallurgical residues containing these non-ferrous metals at an oxidation state of greater than or equal to zero, in an alternating current type plasma arc electric furnace comprising a plurality of electrodes, containing a liquid copper heel covered by a fluid slag comprising at least one fusion-reduction phase, comprising charging of metallurgical residues comprising the non-ferrous metals onto the heel contained in the plasma arc electric furnace, fusion of the metallurgical residues in the fluid slag or at the slag-metal bath interface, reduction of at least the non-ferrous metals to oxidation state zero, and intense stirring of the copper heel by injection of inert gas, preferably nitrogen and/or argon, so as to avoid crust formation and to accelerate the reduction reaction and to cause the copper-miscible non-ferrous metals to pass into the copper heel.

Recovery of residues containing copper and other valuable metals

The invention describes a method for recovering molybdenum, nickel, cobalt or their mixtures from used or regenerated catalysts in an electric arc furnace containing a heel of liquid cast iron, surmounted with a fluid slag, comprising the following steps: a) adding used or regenerated catalysts into the heel contained in the electric arc furnace, b) adding dosed lime in order to obtain a slag with a CaO to AlOratio comprised between 0.7 and 1.3, c) mixing the heel by injecting gas so as to avoid formation of crusts, d) melting the used or regenerated catalysts in the electric arc furnace in order to obtain a liquid ferro-alloy.

Method for recovering molybdenium, nickel, cobalt or their mixtures from used or regenerated catalysts

Disclosed is a process and apparatus for the treatment of divided metal residues contaminated by one or more organic compounds, including mixing, inside a chamber, of metal residues with at least one calcium/magnesium compound capable of reacting exothermically with water; exothermic reaction of the at least one calcium/magnesium compound with the water that the metal residues contain; rise in temperature of the metal residues subject to an exothermic reaction; dehydration of the metal residues during this exothermic reaction; oxidation of the organic compounds during the mixing, by bringing the metal residues contaminated by one or more organic compounds mixed with the at least one calcium/magnesium compound into contact with a gas stream containing at least partly oxygen; and removal from the chamber of a handleable dehydrated treated product having a residual content of organic compounds of less than 1% by weight of the treated product.

Process for the treatment of contaminated metal residues and apparatus for implementing it

The invention concerns a method for treating iron-and-steel plant sludge comprising adjusting the available CaO content of the sludge so as to obtain an available CaO content of 3% to 8% based on the sludge weight, adding a carbon-containing fuel, introducing the sludge onto one of the upper stages of a multistage furnace, heating the multistage furnace, gradually transferring the sludge onto the lower stages, and adjusting the temperature of the exhaust gases of the multistage furnace to at least 500.degree. C. and that of the treated sludge at the output of the multistage furnace to a temperature ranging between 700.degree. C. and 800.degree. C.

Treatment of steel plant sludges in a multiple-stage furnace

A process for producing liquid smelting iron in an electric arc furnace includes several electrodes, equipped with a hearth, and containing a heel covered with a non-foaming liquid slag. The process further includes the reduction of the metallic fines, in order to form pre-reduced metallic fines containing an excess of free carbon; the hot transfer of the pre-reduced metallic fines within a curtain of inert gas into the heel contained in the electric arc furnace; the agitation of the heel by the injection of gas in such a manner that the formation of crusts is avoided; and the smelting of the pre-reduced metallic fines in the electric arc furnace in order to obtain the liquid smelting iron.

Method for producing a melt iron in an electric furnace

A method is presented for the treatment of slag from electric steel plants which comprises the following steps: (a) transference of the slag into a metallurgical receptacle; (b) defoaming of the slag in this metallurgical receptacle by adding a defoaming agent, preferably silica; (c) subsequent heating of the slag to make it fluid; and (d) forced cooling of the slag, for example by an aqueous granulation.

Method for treating steel plant slag

A method for producing molten metal by the reduction and melting of raw materials in a submerged arc type electric furnace includes at least one electrode, where substantial amounts of slag are generated so that the electric furnace contains a bath of molten metal covered with a thick layer of molten slag having a mass per unit area of at least 1000 kg/m . The thick layer of molten slag is made to foam locally around the at least one electrode so as to create around the electrode a local layer of foaming slag in which the density of the slag is at least 50 per cent lower than in the rest of the electric furnace.

Method for optimizing the operating conditions of a submerged arc furnace

The invention concerns a method for producing melt iron comprising the following steps: a) reducing the iron ore particles to form pre-reduced iron comprising excess free carbon; b) hot process transfer of the pre-reduced iron in a smelting furnace; c) smelting the pre-reduced iron in a smelting furnace to obtain melt iron.

Method for producing melt iron

A simple and compact device for wet granulation of liquid slag, comprising a granulating basin with a water injection device and a decanting basin that is separate from the granulating basin. A distribution channel for the granulate-water mixture extends above the decanting basin and is provided with outflow means along the entire length and on the lower side thereof for the granulate-water mixture. A vertical inflow shaft that is open towards the bottom is arranged underneath the distribution channel. The outflow means for the granulate-water mixture discharges into said inflow shaft.

Device for wet granulation of liquid-slag

The invention relates to a method for producing directly reduced, desulfurized iron in a multiple-hearth furnace which comprises two zones arranged one above the other and each having several hearths. Iron ore is reacted with a reducing agent in a first zone of the multiple-hearth furnace at a temperature ranging from 800&deg; C. to 1100&deg; C. to obtain metallic iron. In addition, the gases are desulfurized using desulphurizing agents, whereby the directly reduced iron is discharged from the multiple-hearth furnace and the desulfurized gases are guided into a second zone where the iron ore is preheated to a temperature ranging from 600&deg; C. to 800&deg; C.

Method for producing directly reduced, desulphurized iron

A method for feeding fines or granules into a light-arc furnace. A hollow electrode provided with a feeding channel is utilized, and is preferably a hollow S&ouml;derberg electrode. A conveyor introduces the fines or granules into the feeding channel so as to maintain in the feeding channel a hollow material in which a lower end is smelted in a molten metal bath.

Method for feeding fines or granules into a light-arc furnace

The invention concerns a method and an installation for minimising the local wear of a bell during a ladle treatment of a liquid metal by rotating the bell about an axis during the treatment of the liquid metal.

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Thionville, France

Jean-Luc Roth