Blast furnace smelting method for sefstromite

Abstract

The invention discloses a blast furnace smelting method for sefstromite. The method comprises the step of smelting a furnace charge into a blast furnace, wherein the furnace charge comprises sefstromite, a fluxing agent and fuel, the sefstromite is composed of vanadium-titanium sinters, vanadium-titanium pellets and lump ores, the fuel is composed of cokes, coke blocks and pulverized coal, blast furnace slag contains 14-28% of TiO2, and molten iron contains 0.25-0.4% of sulfur and 0.15-0.4% of silicon. The method is beneficial to the recycle of vanadium and titanium, and the blast furnace smelting cost is reduced.

Description

technical field [0001] The invention relates to the technical field of blast furnace smelting, in particular to a method for blast furnace smelting of vanadium-titanium iron ore. Background technique [0002] Blast furnace smelting is an important link in iron and steel production. The technical and economic indicators of blast furnace smelting are good, the process is simple, the production capacity is large, the labor productivity is high, and the energy consumption is low. The iron produced by this method still accounts for more than 95% of the world's total iron production. , as the domestic supply of ordinary iron ore is tight and the price is gradually rising, the large-scale use of ordinary iron ore will significantly increase the production cost of ironmaking. Vanadium-titanite is an oxide ore mainly composed of iron, accompanied by various rare and high-value metals such as vanadium and titanium. 2 O, Na 2 The content of O, lead and zinc is relatively lower than t...

AI Technical Summary

Problems solved by technology

As the degree of reduction gradually increases, the content of TiC, TiN and their solid solution Ti(C,N) in the slag increases continuously, and the viscosity of the slag increases gradually. When the TiO in the slag 2 When it is reduced to a certain level, the viscosity of the slag will increase sharply, and the fluidity will become poor, resulting in the separation of blast furnace slag and iron, failure of slag and iron removal, and deterioration of furnace conditions. In severe cases, furnace conditions will be abnormal

On the other hand, silicon in molten iron will oxidize with additives to form various oxides and enter into slag, when vanadium is oxidized to form V 2 o 5 When entering the slag, it must be diluted by the oxides of the above elements, resulting in the V 2 o 5 Low content, thus affecting the recovery rate of vanadium

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