Patent GB-979308-A (GB)
Title: Method for reducing ores and producing synthesis gas
IPC: C21B13/14
Filed: 1961-11-01
Abstract: <PICT:0979308/C1/1> Synthesis gas is prepared, and metal oxides reduced by injecting into a reaction zone at high velocity streams of powdered metal oxide, oxygen or an oxygen-containing gas and carbonaceous fuel, the paths of the high velocity streams being directed so as to impinge upon and mix with one another under conditions of turbulence within the reaction zone, the amount of available oxygen being in excess of that required to convert all the carbon in the fuel to carbon monoxide and less than that required to convert all the carbon to carbon dioxide and the amount of metal oxide being less than that theoretically reducible by the resulting synthesis gas, and recovering a reduction product of the metal oxide. Preferably, iron ore is reduced, byt silica, tungsten oxides, nickel oxide and alumina, and uranium ores, and oxide producing substances such as carbonates, hydrates and silicates may be treated.  The gas is preferably 90-98% oxygen but any gas containing more than 40% oxygen may be used.  In a preferred embodiment fuel is admitted through a line 13 to a burner pipe (not shown) in a shaft type furnace 10 having a refractory lining 11.  Iron oxide and oxygen are admitted through line 16 to burner pipes (not shown).  Sponge iron or refined metal is removed from the draw-off 21 and the gases withdrawn through nozzle 20.  The process may be carried out in 3 stages, the first 2 at 1800 DEG  F. in which 70% of the conversion takes place, and the last at 28.0 DEG  F. when manganese, boron, chromium or nickel may be added. Specifications 771,060 and 806,533 are referred to.ALSO:Synthesis is prepared, and metal oxides reduced by injecting into a reaction zone at high velocity streams of powdered metal oxide, oxygen or an oxygen-containing gas and carbonaceous fuel, which may be solid, liquid, or gaseous, the paths of the high velocity streams being directed so as to impinge upon and mix with one another under conditions of turbulence within the reaction zone, the amount of available oxygen being in excess of that required to convert all the carbon in the fuel <PICT:0979308/C4-C5/1> to carbon monoxide and less than that required to convert all the carbon to carbon dioxide and the amount of metal oxide being less than that theoretically reducible by the resulting synthesis gas, and recovering a reduction product of the metal oxide.  Preferably iron ore is reduced, but silica, tungsten oxides, nickel oxide and alumina, and uranium ores, and oxide-producing substances such as carbonates, hydrates and silicates may be treated.  The gas is preferably 90-98% oxygen but any gas containing more than 40% oxygen may be used, including H2O and/or CO2.  In a preferred embodiment fuel, e.g. CH4, is admitted through a line 13 to a burner pipe (not shown) in a shaft type furnace 10 having a refractory lining 11. Iron oxide and oxygen are admitted through line 16 to burner pipes (not shown). Sponge iron or refined metal is removed from the draw-off 21 and the gases withdrawn through nozzle 20.  The process may be carried out in 3 stages, the first 2 at 1800 DEG  F. in which 70% of the conversion takes place, and the last at 2800 DEG  F. when manganese, boron, chromium or nickel may be added.  Specifications 771,060 and 806,533 are referred to.ALSO:<PICT:0979308/C6-C7/1> Synthesis gas is prepared, and metal oxides reduced by injecting into a reaction zone at high velocity streams of powdered metal oxide, oxygen or an oxygen-containing gas and carbonaceous fuel, the paths of the high velocity streams being directed so as to impinge upon and mix with one another under conditions of turbulence within the reaction zone, the amount of available oxygen being in excess of that required to convert all the carbon in the fuel to carbon monoxide and less than that required to convert all the carbon to carbon dioxide and the amount of metal oxide being less than that theoretically reducible by the resulting synthesis gas, and recovering a reduction product of the metal oxide. Preferably iron ore is reduced, but silica, tungsten oxides, nickel oxide and alumina, and uranium ores, and oxide producing substances such as carbonates, hydrates and silicates may be treated.  The gas is preferably 90-98% oxygen but any gas containing more than 40% oxygen may be used.  In a preferred embodiment fuel is admitted through a line 13 to a burner pipe (not shown) in a shaft type furnace 10 having a refractory lining 11. Iron oxide and oxygen are admitted through line 16 to burner pipes (not shown).  Sponge iron or refined metal is removed from the draw-off 21 and the gases withdrawn through nozzle 20.  The process may be carried out in three stages, the first two at 1800  DEG F. in which 70% of the conversion takes place, and the last at 2800  DEG F. when manganese, boron, chromium or nickel may be added. Specifications 771,060 and 806,533 are referred to.