Hylsa, S.a. De C.v.

Other

Outotec Oyj

Hylsa, S.a.

Marco Aurelio Flores-Verdugo

Ricardo Viramontes-Brown

Jorge O Becerra-Novoa

Jose J Garza-Ondarza

Juan F Price-Falcon

Juan Celada-Gonzalez

Jorge D Berrun-Castanon

Leobardo Chapa-Martinez

Ronald Victor Manuel Lopez-Gomez

Ernesto Narvaez-de-Leon

Luis Lauro Alanis-Santos

Karsten Hoffhaus

Rolando Montemayor-Silva

Alberto Diego Soriano-Gutierrez

Gunther Kazmeier

Cesar Humberto Valdez-Chapa

Tomas Gilberto Hernandez-Otero

The present invention relates to a pipe segment including an outer and an inner pipe section, with the inner pipe section being positioned within the outer pipe section, and a support means supporting the inner pipe section in relation to the outer pipe section so that the inner pipe section can expand axially relative to the outer pipe section in response to temperature changes in the material being transported in the pipe segment. Furthermore, the present invention refers to a transfer line for transporting hot particulate material, such as iron ore fines, in a carrier gas, including a plurality of these pipe segments and to a process for transporting hot particulate material in a carrier gas in a direct smelting plant for producing molten metal from a metalliferous feed material, in particular between a pretreatment unit and solid delivery means in the form of lances for injecting the material into a direct smelting vessel.

Pipe segment for a transfer line for transporting hot particulate material

Method and apparatus for pneumatically transporting solid and abrasive particulate materials at high temperature, by means of a carrier gas through a plurality of co-axial straight pipes. The pipes are maintained under constant tension by applying a force across at least one expansion joint coupling said pipes in order to maintain said pipes straight against the forces acting on said pipes which tend to cause bending and deformation thereof, as for example: thermal elongation, the weight of the solids conveyed through said pipes, the friction forces between said pipes and its supporting frame, and the pressure of the carrier gas inside said pipes. The constant tensioning force may be applied for example, by means of hydraulic cylinders in combination with a telescopic water-cooled sleeve.

Expansion joint for high-pressure high-temperature pneumatic transport of DRI or other abrasive particles

A valve for feeding abrasive particulate material to, and removal of particulate material from a pressurized vessel, adapted to operate at temperatures above 500.degree. C., comprises a valve structure wherein a single shutoff member of generally spherical shape performs both functions of shutoff the particulate material and the gas-tight sealing by means of a resilient inflatable circular seal element which engages the convex side of said shutoff member. Said seal element is inflated and cooled by a pressure regulated and continuously flowing stream of liquid water. The seal element is protected from being damaged at high temperatures by contacting it with the cooled shutoff member when the valve is closed and with a cooled circular extension of the shutoff member when the valve is open.

Spherical valve for flow control of particulate solids and gases

Refractory materials (typically refractory bricks) having the exposed working surface treated to form a silica sand glazed surface for their utilization in iron ore reduction reactors, for example of the moving bed type, fluidized bed type, rotary kilns, or the like, and method and apparatus for treating refractory bricks before installation as well as for treating refractory linings already installed in existing iron ore reduction plants, which produce direct reduced iron (DRI), prereduced iron ores, or the like. Some operational problems, involving adherence and buildup of aggregates from small metallic iron particles on the refractory lining of said reduction reactor, are minimized with a corresponding decrease in operating costs and an increase in the availability of the DRI producing plant.

Refractory bricks for iron ore reduction reactors

In method and apparatus for producing iron and steel from iron cores largely composed of iron oxides, wherein a direct reduction process is used to produce a solid particulate intermediate product, generally known as sponge Iron or Direct Reduced Iron (DRI); pneumatically conveying large iron-bearing particles, such as pelletized iron ore or particularly DRI, in a closed transport pipe, eg. from the reduction reactor of the direct reduction process to the metallurgical furnaces where liquid iron or steel are produced, for example electric arc furnaces, induction furnaces, basic oxygen furnaces, etc. or to a briquetting press to form DRI briquettes, or simply to a silo or storage bin, or in general to a subsequent processing step for said DRI. When the carrier gas is recirculated for reuse, surprisingly air can be a preferred source of such gas, especially for reactive hot DRI. This method has a superior efficiency and productivity and reduces the overall energy consumption relative to currently used DRI steelmaking plants. By using pneumatic conveyors, elements of the plant may be arranged side by side rather than one on top of the other, whereby the overall height of the plant may be reduced.

Apparatus for the pneumatic transport of large iron-bearing particles

In a method of producing iron and steel, from iron ores largely composed of iron oxides, wherein a direct reduction process is used to produce a solid particulate intermediate product, generally known as sponge iron or Direct Reduced Iron (DRI); pneumatically conveying the DRI in a closed pipe from the reduction reactor of the direct reduction process to the metallurgical furnaces where liquid iron or steel are produced, for example electric arc furnaces, induction furnaces, basic oxygen furnaces, etc. or to a briquetting press to form DRI briquettes, or simply to a silo or storage bin, or in general to a subsequent processing step for said DRI. When the carrier gas is recirculated for reuse, surprisingly air is preferred as the source of such gas, especially for reactive hot DRI. This method has a superior efficiency and productivity and reduces the overall energy consumption relative to currently used DRI steelmaking plants. This is also applicable to pneumatic delivery of cold (or hot) ore to the reduction reactor.

Method for the pneumatic transport of large iron-bearing particles

A method of eliminating hot spots in a mass of sponge iron particles made by gaseous reduction of iron ore. A layer of the particulate product is moved to a separating station, near which the layer is viewed by an infra-red detector that generates a control signal when insufficiently cooled particles register therewith. The control signal is used to shift the position of a particle guide member at the separating station to cause insufficiently cooled particles to be diverted from the main particle stream. Preferably the separation is carried out in two stages. Apparatus for carrying out the method is disclosed and claimed.

Method and apparatus for separating insufficiently cooled metal sponge

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Monterrey, Mexico

Marco Aurelio Flores-Verdugo