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Blast furnace smelting method using vanadium-titanium two-phase sinter

A blast furnace smelting and sintering ore 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 iron making. , the effect of increasing the ratio

Active Publication Date: 2016-09-07
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Pansteel Group Xichang Steel and Vanadium Company originally designed the blast furnace charge structure as 25% pellets + 5% lump ore + 70% sintered ore to ensure that the TFe grade of the ore entering the blast furnace reached 51.5%. Later, due to changes in market conditions, the grade of TFe in the furnace ore was only about 49.5%, and the iron ore consumption per ton increased. Two sets of 360m 2 Guaranteed supply of 3 sintering machines 1750m 3 Blast furnace production, sinter output is obviously insufficient, and the pellet ratio exceeds 30% when the blast furnace is high-yield. The vanadium-titanium sinter produced by the ordinary sintering process of blast furnace smelting has unsatisfactory technical and economic indicators, and the cost of pig iron is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 Preparation of vanadium-titanium two-phase sinter

[0037] The sinter raw material contains the following mass ratio components: 50-75% of vanadium-titanium magnetite concentrate, 5-30% of ordinary iron lump ore, 8-15% of flux, and 3-5% of fuel; -45%; Among them, the composition of vanadium-titanium magnetite concentrate is TFe40-60%, TiO 2 Content 0-15%; TFe 47-52% in the sintered ore, ternary basicity ((CaO+MgO) / SiO 2 ) at 2.0-3.5 times, MgO content 2.0-4.0%, TiO 2 content of 6.0-9.0%; the low-basicity phase (CaO / SiO22 >2 times) accounts for 50-80% of the sintered mineral material (deducting return ore);

[0038] Preparation of sintered ore: 50-75% of the above-mentioned vanadium-titanium magnetite concentrate, 5-30% of ordinary iron ore, 8-15% of flux, and 3-5% of fuel; in addition, the above-mentioned 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 t...

Embodiment 2

[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 particle size of the pellets is 8-20mm; the vanadium-titanium pellets are prepared by adopting the production process of the chain grate rotary kiln.

Embodiment 3

[0042] Example 3 The method of blast furnace smelting using vanadium-titanium two-phase sinter

[0043] Blast furnace charge structure: 100% of the vanadium-titanium two-phase sintered ore prepared in Example 1 is added to the blast furnace in batches with fuel from the top of the blast furnace; the grade of TFe integrated into the blast furnace is 45-52%;

[0044] Charging system: adopt equal material line for ore and coke, material line 1.2-2.2 meters, batch weight of ore 16-48t, coke load 2.5-5.5t / t, ore platform 1-9 rings, coke platform 2-9 rings, coke The outer ring is 0.5-3° larger than the ore outer ring, the coke middle ring is equiangular with the ore inner ring, 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 heat system: control [Ti] in pig iron between 0.10-0.40%, [Si] between 0.10-0.30%, [Si]+[Ti] between 0.20-0.7%;

[0046] Slagging system: MgO content in blast furnace slag...

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Abstract

The invention belongs to the technical field of iron and steel metallurgy, in particular relates to a blast furnace smelting method by using a vanadium-titanium two-phase sintering ore. The blast furnace smelting method by using vanadium-titanium two-phase sintering ore is characterized in that the blast furnace burden structure is as follows: 70-100wt% of vanadium-titanium two-phase sintering ore, 0-30wt% of vanadium titanium magnetite pellet and 0-10wt% of common iron ore, wherein the common iron ore is an iron ore containing no vanadium or titanium. The invention provides the blast furnace smelting method by using vanadium-titanium two-phase sintering ore, and the method is low in cost; vanadium-titanium titanic magnetite for blast furnace smelting is provided by the vanadium-titanium two-phase sintering ore, so as to optimize the blast furnace burden structure, improve the breathability of the blast furnace burden structure and perfect the technical-economic indicator of blast furnace smelting.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a blast furnace smelting method using vanadium-titanium two-phase sintered ore. Background technique [0002] Panxi vanadium titanomagnetite TiO 2 High content, SiO 2 Low content, due to the insufficient amount of liquid phase in the sintering process, it is difficult to achieve good bonding of the sintered ore, and CaO·TiO2 which is not conducive to the consolidation of the sintered ore is formed. 2 phase, resulting in high brittleness of vanadium-titanium sintered ore, poor strength, low yield and high pulverization rate. Experimental research shows that vanadium-titanium magnetite concentrate is suitable for the production of low alkalinity (CaO / SiO 2 <1.0 times) or high alkalinity (CaO / SiO 2 >2.0 times) sintered ore, the sintered ore with alkalinity between 1.1 and 2.0 times has poor strength, more powder and easy to pulverize. It can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00C22B1/16
Inventor 林文康石军陆高峰邹仕华毛建林张志强
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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