Blast furnace smelting method by using vanadium-titanium two-phase sintering ore
A blast furnace smelting and sintering technology, applied in the field of iron and steel metallurgy, can solve the problems of unsatisfactory technical and economic indicators, increased consumption of iron ore per ton, insufficient sintered ore output, etc., and is beneficial to the stable and smooth operation of the blast furnace and reduces the cost of ironmaking. , the effect of increasing the ratio
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[0036] Example 1 Preparation of vanadium-titanium two-phase sinter
[0037] The sinter raw materials contain the following components in the mass ratio: 50-75% of vanadium-titanium magnetite concentrate, 5-30% of ordinary iron nugget ore, 8-15% of flux, 3-5% of fuel; -45%; Among them, the content of vanadium-titanium magnetite concentrate is TFe40-60%, TiO 2 Content 0-15%; TFe 47-52% in the sinter, ternary basicity ((CaO+MgO) / SiO 2 ) At 2.0-3.5 times, MgO content 2.0-4.0%, TiO 2 The content is 6.0-9.0%; the low-basicity phase (CaO / SiO22 >2 times) accounted for 50-80% of sintered mineral materials (deducted return);
[0038] Preparation of sinter: 50-75% of the above vanadium-titanium magnetite concentrate, 5-30% of common iron ore, 8-15% of flux, 3-5% of fuel; Materials (new materials) are also added with returned ore and recycled materials in the factory. The quality of returned ore accounts for 20-45% of the total new material, and the quality of recycled materials in the factory...
Example Embodiment
[0040] Example 2 Preparation of vanadium-titanium pellets
[0041] The material structure is 97-99% vanadium-titanium concentrate, 1-3% bentonite, 49-56% TFe in vanadium-titanium pellets, TiO 2 The content is 6.0-11.0%; the pellet size is 8-20mm; the vanadium-titanium pellets are prepared by the production process of the grate rotary kiln.
Example Embodiment
[0042] Example 3 Blast furnace smelting method using vanadium-titanium two-phase sinter
[0043] Blast furnace charge structure: 100% of the vanadium-titanium two-phase sinter prepared in Example 1 is added to the blast furnace from the top of the blast furnace in batches with fuel; the TFe grade of the blast furnace is 45-52%;
[0044] Charging system: adopts equalizing material line for ore and coke, material line is 1.2-2.2 meters, ore batch weight is 16-48t, coke load is 2.5-5.5t / t, ore platform 1-9 ring, coke platform 2-9 ring, coke The outer ring is 0.5-3° larger than the ore outer ring, the coke middle ring and the ore inner ring are equiangular, the ore outer ring is 0-10° larger than the inner ring, and the coke inner ring is 1-10° smaller than the ore inner ring;
[0045] Hearth heating system: control [Ti] in pig iron between 0.10-0.40%, [Si] between 0.10-0.30%, and [Si]+[Ti] between 0.20-0.7%;
[0046] Slagging system: the content of MgO in blast furnace slag is controlled...
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