Praxair Technology, Inc.

Steel Technology Corporation

Balu Sarma

John Erling Anderson

William John Mahoney

Kenneth B Downing

Ronald Joseph Selines

Maynard Guotsuen Ding

Dennis R Farrenkopf

Pravin Chandra Mathur

Joseph E McGreal

A metal refining method particularly useful with a basic oxygen steelmaking process, wherein during an initial period, refining oxygen is provided into the furnace headspace surrounded by a shroud comprising oxygen and inert gas, and during a subsequent period refining oxygen is provided into the furnace headspace surrounded by a flame shroud.

Metal refining method using differing refining oxygen sequence

A lance which may be used to generate a longer coherent gas jet having inflowing and outflowing coolant fluid passages which are in flow communication and which straddle the flame envelope fluid passages, all of which are coaxial with the main passageway.

Fluid cooled coherent jet lance

A system for providing gases into an injection volume in one or more coherent gas jets proximate to one or more turbulent gas jets wherein a coherent gas jet is formed in a forming volume with a flame envelope prior to passage into the injection volume into which the turbulent gas jets are directly passed.

System for providing proximate turbulent and coherent gas jets

Method for stable operation of a smelter reactor

A method for changing the length of a coherent jet by establishing a coherent jet using a flame envelope generated using gaseous fuel and changing the flowrate of the gaseous fuel, preferably using inert gas for make up to maintain a constant total flowrate of fuel and inert gas.

Method for changing the length of a coherent jet

A system for producing direct reduced iron wherein iron oxide material and carbonaceous material is passed successively through an oxidizing zone and a reducing zone of a furnace, each zone fired by oxy-fuel combustion, enabling a reduction in the amount of fuel needed to process the material while generating sufficient carbon monoxide to effect the reduction and ensuring that little or no carbon monoxide is emitted from the furnace.

Apparatus for production of direct reduced iron with reduced fuel

In order to lower the sulfuric content of the offgas from a smelter reactor in which iron oxide is reduced to molten iron, in the presence of sulfur contaminants, a sufficient amount of a source of zinc is included in the charge to the reactor that the combined weight of the zinc source and the iron oxide source contains at least about 0.6% Zn (calculated as elemental zinc), on a dry weight basis. The temperature of the offgas is maintained at or above approximately 700.degree. C. Vaporized zinc, present in the offgas, binds with sulfur in the offgas to precipitate solid ZnS. After removal of the ZnS, the offgas may have a sulfuric content below 50 ppm by volume of H.sub.2 S equivalent. Suitable sources of zinc include blast furnace dust, electric arc dust, basic oxygen furnace dust, zinc calcine, and zinc sinter.

Method for reducing sulfuric content in the offgas of an iron smelting

Production of direct reduced iron with reduced fuel consumption and

A process of smelting iron that comprises the steps of:

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Airmont, NY, United States of America

Balu Sarma