RU2012135608A - METHOD FOR LIQUID PHASE OF IRON OF DIRECT RECOVERY - Google Patents

Abstract

1. The method of liquid-phase production of direct reduction iron in an electric arc furnace, characterized by using a molten bath as a reaction medium and a reduction zone, further supplying carbon-containing material, iron ore, flux into the bath volume, blowing oxidizing gas into it, and oxidizing carbon in the bath volume to CO by transferring the released heat of decarburization to the molten bath, by heating the carbon-containing material, by gasification of its organic part, by transferring carbon to the solution with iron, heating the particles of iron ore raw materials to a molten state, the interaction of liquid iron oxides with carbon, to obtain iron and CO, bubbling the molten bath with gas bubbles, boiling and stirring, floating gas bubbles on the surface of the bath, afterburning of CO and Nad surface with oxidizing gas, transfer heat of afterburning of the bath, melting and / or dissolution of flux in the slag, mineral components of carbon-containing material, waste rock of iron ore raw materials and ash of carbon-containing material by removing from the furnace the resulting process gases and the release of liquid metal and slag, while particles of a carbon-containing material or substance and iron ore are introduced directly into the volume of the metal bath and iron oxides are reduced with carbon to produce carbon monoxide by the endothermic reaction 3 [C] + (FeO) = 2 [Fe] +3 {СО}, accompanied by oxidation of carbon, moreover, gaseous oxygen is blown into the metal bath simultaneously and simultaneously with the supply of the starting materials and the reduction of iron

Claims (7)

1. The method of liquid-phase production of direct reduction iron in an electric arc furnace, characterized by using a molten bath as a reaction medium and a reduction zone, further supplying carbon-containing material, iron ore, flux into the bath volume, blowing oxidizing gas into it, and oxidizing carbon in the bath volume to CO by transferring the released heat of decarburization to the molten bath, by heating the carbon-containing material, by gasification of its organic part, by transferring carbon to the solution with iron, heating the iron ore particles to a molten state, the interaction of liquid iron oxides with carbon, to obtain iron and CO, bubbling the molten bath with gas bubbles, boiling and stirring, floating gas bubbles on the surface of the bath, burning CO and H ₂ over the surface with oxidizing gas by transferring the heat of afterburning to the bath, by melting and / or dissolving flux of mineral components of carbon-containing material, waste iron ore and ash of carbon-containing material in slag la, by removing from the furnace the resulting process gases and the release of liquid metal and slag, while particles of a carbon-containing material or substance and iron ore are injected directly into the volume of the metal bath and iron oxides are reduced with carbon to produce carbon monoxide by endothermic reaction 3 [C] + (Fe ₂ O ₃₎ = 2 [Fe] +3 {CO} accompanied by the oxidation of carbon, the metal bath in parallel and simultaneously with the starting materials and the reduced iron is injected gaseous sour with genus specific intensity 0,1-5m ³ / (min · m), and carried out the oxidation (combustion) of carbon introduced by the exothermic reaction [C] +1/2 {O} _3} = {SB except its portion extending to reduction of iron from Fe ₂ O ₃ , while the specific consumption of carbon and oxygen is selected from the ratio (m _C -321) / $$m_O{}_{{}_2}$$

= 0.5 ÷ 1.5, where m _c is the specific consumption of carbon introduced with the carbon-containing material per ton of iron, kg / t; 321 — specific carbon consumption for reduction from Fe ₂ O _{3 of} one ton of iron, kg / t; $$m_O{}_{{}_2}$$

- specific consumption of gaseous oxygen introduced with blast per ton of iron, kg / t, and for 0.5-10.0 minutes before the direct reduction iron obtained from the furnace is removed, 5-95% of carbon is removed from it by additional oxidation by gaseous oxygen injected into the metal with a specific intensity of 0.1-5.0 nm ³ / (caraway). 2. The method according to claim 1, characterized in that for the reduction of iron, carbon is used simultaneously in the dissolved and free states with its total concentration in the metal bath of 3-15%, while the ratio of the concentrations of dissolved and free carbon in the course of reduction smelting is maintained within 1: (0.1 ÷ 3). 3. The method according to claim 1, characterized in that in a metal bath maintain a temperature equal to or greater than 1400 ° C. 4. The method according to claim 1, characterized in that for the reduction of iron using an electric arc furnace with a specific electric power equal to or greater than 0.8 mW per ton of furnace capacity. 5. The method according to claim 4, characterized in that, in the course of reducing iron, an additional electric power is supplied to the electric furnace in an amount of 30-200 mW per minute per ton of iron ore. 6. The method according to claim 1, characterized in that the combustible components of the process gases are sent outside the furnace to a power plant to generate electrical and / or thermal energy. 7. The method according to claim 1, characterized in that the combustible components of the process gases are burned above the surface of the molten metal bath with a degree of afterburning of not more than 20%.