Other

Stora Kopparbergs Bergslags Ab

Asea Ab

Metallgesellschaft Aktiengesellschaft

Asea Aktiebolag

Stora Kopparbergs Bergslags Aktiebolag

Stora Kopparberg Bergslags Aktiebolag

Per H Collin

Sune N Flink

Mans Collin

Erik A Bengtsson

Martin Hirsch

Lothar Reh

Bjorn Widell

Method and a device for producing fuels

Device for the indirect heating of air

Process for generating electric power

A process for preparing crude iron and energy-rich, gases, the raw materials being comprised of iron ore concentrate, carbon-containing materials, optionally oxygen gas and electric energy, comprising the combination of the following operations:

Process for the manufacture of crude iron and energy-rich gases

In a combined process crude iron and a synthesis gas particularly suitable for the preparation of methanol are prepared by supplying iron ore concentrate to the plasma zone between an electrode and a crude iron melt in an arc furnace, while injecting gaseous or volatile hydrocarbons, for example natural gas mainly consisting of methane, into the crude iron melt.

Process for the manufacture of crude iron and synthesis gas

A method is suggested for the reduction of finely-divided iron oxide in a fluidized bed, with the air of reducing gases formed by partial combustion in the bed of finely-divided carbonaceous material by gas containing molecular oxygen, which is supplied through nozzles (4). The exterior surface of the nozzles is cooled to a temperature lower than 200.degree. C below the melting point of the reduced metal. In this way the particles of the reduced iron are prevented from adhering to the nozzles.

Method and apparatus for reducing an iron oxide material in a fluidized

Apparatus for reducing finely divided iron oxide material

A process for removing sulphur from crude iron, comprising:

Process for removing sulphur from crude iron

An iron oxide melt reduction furnace has a hearth with a raised periphery forming an annular shelf, the hearth holding a carbonaceous iron melt up to a level forming a thin layer on the shelf. The furnace side wall extends upwardly from the periphery of the hearth's shelf, and means are provided for feeding material containing iron oxide to the melt at a location inside of the shelf, for reduction of the oxide by the melt's carbon. Means are provided for feeding solid steel scrap to the hearth's shelf and the shallow melt layer thereon so as to maintain on the shelf an annular pile of the scrap sloping downwardly from the furnace side wall to the inner periphery of the shelf. The scrap, inherently of lower carbon content than the carbonaceous iron melt, adulterates and thereby lowers the carbon content of that shallow layer, this raising the melting temperature of the shallow layer while reducing its temperature, thus forming adjacent to the furnace's side wall a relatively low-temperature mixture that is partially solid and partially liquid metal, which together with the scrap between that mixture and the inner periphery of the shelf, protects the side wall lining from the destructive attack that otherwise occurs when it is contacted by the upper level of the melt and the slag formed by the reduction of the oxide and floating on the melt.

Iron oxide melt reduction furnace and method

Carbonaceous material, preferably coal or like finely divided solids with a mean particle diameter of 30 to 250 microns, is burned to produce steam in a fluid-bed furnace having a lower free space without internal fixtures and provided above this free space with internal cooling surfaces. A secondary-gas inlet introduces the secondary gas so that the volume ratio of fluidizing gas to secondary gas ranges from 1:20 to 2:1 at a location above the fluidizing-gas and fuel inlets but below the internal cooling surfaces, the gas velocity of the several gases being adjusted so that the mean suspension density of the solids above the secondary-gas inlet is 15 to 100 kg/m.sup.3. Approximately stoidiometric conditions are maintained with respect to the oxygen in the gases introduced and the carbonaceous material and solids are recycled to the bed after being separated from the gases emanating therefrom.

Process for burning carbonaceous materials

A method for making crude steel has been disclosed where the crude steel is obtained by melt reduction using as raw materials fine grained oxide containing material, fine grained solid, liquid and/or gaseous fuels and oxygen gas; the method comprises the following interrelated steps of feeding the reaction materials into a molten steel bath through at least one compound nozzle, each of which has a central opening and two concentrically surrounding annular slits, injecting said iron oxide containing material, wherein the same may be prereduced to FeO, by admixing said iron oxide material with a fuel including fine grained slag formers, said injecting of the iron oxide, fuel or slag formers being into the steel bath through the inner annular slit at such a depth under the surface of the bath that said iron oxides become melt reduced before these reach the surface of the bath, injecting oxygen, at the same time as said iron oxide containing material, fuel or slag formers are being injected, through the central, circular opening and injecting hydrogen, through the outer annular slit at such a rate that the heat requirement for the melt reduction is satisfied by partial combustion in the bath of hydrogen and carbonaceous material in said fuel and producing reaction gas thereby, utilizing a part of a heat content of said reaction gas and utilizing said reaction gas for said prereduction of the iron oxide containing material, catalytically converting to H.sub.2 the reaction gas leaving the steel bath, separating from said catalytically converted H.sub.2 gas, CO.sub.2 and H.sub.2 O, said residual gas thus being obtained consisting of hydrogen, which is injected through the inner annular slit of said compound nozzle.

Method for direct manufacture of crude steel

A method for partial reduction in a fluid bed of a fine grained iron oxide containing material whereby a fine grain low sulphur content mixture of partially reduced iron oxide containing material and coke is produced; the coke is obtained from carbonaceous material with a relatively high content of sulphur; accordingly, the combination allows the utilization of carbonaceous materials with a relatively high content of sulfur for the reduction of iron oxide and subsequent production of iron or steel without transferring the sulfur into the final product but separating it therefrom during the partial reduction of the iron oxide.

Growing community of inventors

Falun, Sweden

Per H Collin