Abstract:
The invention relates to a method for treating, preferably for reducing, particulate material in at least one fluidization zone at an increased temperature, particularly for reducing ore dust. According to the method, the particulate material is held in the fluidization zone by a treatment gas that flows upward from the bottom, and fine-particulate material, which is transported out of the fluidization zone with the treatment gas is separated from the treatment gas in a separating zone. To this end, the following steps are carried out in the separating zone: feeding the stream, which consists of treatment gas and of transported fine-particulate material, to a separating device (8); separating the fine-particulate material from the treatment gas, whereby the treatment gas is extracted from the separating device as waste gas, and; withdrawing the separated fine-particulate material out of the separating device (8). The invention also relates to a device for carrying out the method. Coarse grained material is introduced into the separating zone whereby reducing the amount of baked on material and deposits thereof.
Abstract:
The invention relates to a device and method for producing pig iron and/or pig iron intermediate products, according to which a metal-containing feed material is melted inside a melting unit (1) during which a working gas that, in particular, at least partially reduces is produced inside the melting unit (1), whereupon the produced working gas is evacuated. The evacuated working gas, optionally after undergoing a purification, is used, in particular, as a delivery gas for effecting, at least in part, a preferably pneumatic transport of an, in particular, fine particulate, at least partially reduced metal-containing material.
Abstract:
Method of blowing metal-oxide-containing fine particles into a reduction gas stream carried in a reduction gas line, a central material jet, formed by the fine particles and carrier gas, being introduced into the reaction gas stream and feeding the material stream into the reducing gas and by directing at least one gas stream formed by a secondary gas against the material stream whereby the gas jet atomizing the material jet and the fine particles being uniformly distributed in the reaction gas stream, and the gas jet imparting a torsional moment to the material jet about the axis of the material jet, and the fine particles leaving the material jet due to centrifugal forces and the said material jet being broken up. Device for performing said method.
Abstract:
A process and apparatus for reducing material in particle form in a fluidization zone and at elevated temperature, in particular for reducing fine ore, the particle material being held in the fluidization zone by a treatment gas which flows upward from below. Material in fine particle form is discharged from the fluidization zone with the treatment gas and is separated out of the treatment gas in a deposition zone. In the deposition zone, the stream of treatment gas and discharged material in fine particle form are fed into a separating device which removes the fine particle material from the treatment gas, the treatment gas is extracted from the separating device as off-gas, and the separated fine particle material is removed from the separating device. Coarse-grained material is then introduced into the deposition zone. This reduces the levels of caking and deposits of the fine particle material. A device for carrying out the process includes elements defining the zones.
Abstract:
The invention relates to a method of returning a finely-divided solid (4) extracted at an extraction point of a reactor vessel (1) from said vessel using a gas to a feed-back point (16) of said vessel. The solid (4) is separated in a solid separator (3), subsequently collected in a collector (8 ) and fed back from said collector to the reactor vessel (1) using a feed gas. To improve operation of the solid separator (3) without extra loading of the reactor vessel (1), an additional gas flow (23) which is independent of the gas flow in the reactor vessel is circulated through the solid separator (3) in the direction of flow of the solid (4).
Abstract:
PCT No. PCT/AT96/00128 Sec. 371 Date Apr. 18, 1997 Sec. 102(e) Date Apr. 18, 1997 PCT Filed Jul. 18, 1996 PCT Pub. No. WO97/04136 PCT Pub. Date Feb. 6, 1997In a process for the production of molten pig iron (12) or steel pre-products from fine particulate iron-containing material, in particular reduced sponge iron, in a meltdown gasifying zone (6) of a melter gasifier (5) the iron-containing material is melted in a bed (16) formed of solid carbon carriers, under the supply of carbon-containing material and oxygen-containing gas at the simultaneous formation of a reducing gas. To prevent the fine particles of the iron-containing material charged to the melter gasifier from being discharged, the iron-containing material is supplied into the a melter gasifier (5) centrally, closely above the bed (16) but in its immediate vicinity, by means of an oxygen-burner (15) under the formation of a high-temperature combustion zone (21).
Abstract:
According to a process for injecting metal-oxide-containing fine particles into a reducing gas, a central material stream formed by the fine particles and a carrier gas is introduced into the reducing gas and at least one gas stream formed by a secondary gas is directed against the material stream to ensure an optimum contact of the fine particles with the reducing gas, the gas stream atomizing the material stream and the fine particles being evenly distributed within the reducing gas.
Abstract:
According to a process for producing pig iron (10) from fine-particulate iron oxide carriers and lumpy iron-containing material in a meltdown gasifying zone (9) of a melter gasifier (3), the iron-containing material is melted in a bed (13) formed of solid carbon carriers, under the supply of carbon-containing material and oxygen-containing gas while simultaneously forming a reducing gas. Fine-particulate iron-oxide carriers, such as iron-containing fine ore and ore dust and oxidic iron fine dust, are introduced into a reducing gas stream leaving the melter gasifier (3), and the reducing gas is separated from the fine-particulate material formed thereby. The separated fine-particulate material is introduced into the meltdown gasifying zone (9) via a dust recirculation line (26, 27, 28, 29) and through a dust burner (30), and the reducing gas is used for reducing iron-oxide-containing material. To be able to charge large amounts of fine ore or ore dust in this process, the separated fine-particulate material in the dust recirculation line (26 to 29) is conveyed via a fluidized bed sluice (25) formed by the separated fine-particulate material and by reducing gas to the dust burner (30) and reduced thereby (FIG. 1).
Abstract:
A method for blowing fine particles containing metal oxide into a reducing gas. In order to achieve maximum contact of fine particles with reducing gas, a central material jet formed from fine particles and carrier gas is introduced into the reducing gas and at least one gas jet formed from a secondary gas is directed against the material jet. The gas jet atomizes the material jet, and fine particles are uniformly distributed in reducing gas.