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Smelting method for converting natural magnetite to vanadium-titanium sinter in blast furnace and for rapidly reaching design capacity

A vanadium-titanium sinter and natural magnet technology, applied in the field of blast furnace smelting, can solve the problems of large difference and increased production cost, and achieve the effects of simple operation, reduced production cost, and shortened time to reach production

Active Publication Date: 2015-09-09
攀钢集团西昌钢钒有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary large blast furnaces use natural magnetite to smelt vanadium-titanium ore, and then switch to vanadium-titanium sintered ore smelting according to furnace conditions. It often takes 5 days for the blast furnace to reach capacity. The conversion of titanium sinter smelting may take longer, and the technical and economic indicators during the period from the start of the furnace to the production capacity are quite different from the normal production technical and economic indicators, resulting in a substantial increase in production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Using 1750m 3 The blast furnace is smelted. Before the blast furnace is opened, enough natural magnetite, vanadium-titanium sintered ore, pellets, coke, limestone and silica are prepared in the blast furnace slot. Use natural magnetite to start the furnace, load the charge into the blast furnace in sections, and control the air volume to 80-85% of the normal air volume, of which the normal air volume is 3800-3900m 3 / min, after one cycle of air smelting, when [Si] in the pig iron is reduced to about 2%, according to the forward flow of the blast furnace, reduce the air volume to 55-60% of the normal air volume, and change to 85% for vanadium-titanium sinter smelting (that is, ore In the batch weight, the weight of vanadium-titanium sinter accounts for 85%), quickly reduce [Si] in pig iron to the normal production level (that is, [Si] in pig iron is 0.16%), add air to more than 80% of the normal air volume, add air The rhythm follows 80m 3 / min control, the wind speed ...

Embodiment 2

[0034] Using 1750m 3 The blast furnace is smelted. Before the blast furnace is opened, enough natural magnetite, vanadium-titanium sintered ore, pellets, coke, limestone and silica are prepared in the blast furnace slot. Use natural magnetite to start the furnace, load the charge into the blast furnace in sections, and control the air volume to 80% of the normal air volume, of which the normal air volume is 3800m 3 / min, after one cycle of air supply smelting, when [Si] in the pig iron is reduced to about 2%, according to the forward flow of the blast furnace, reduce the air volume to 55% of the normal air volume, and change to 85% for vanadium-titanium sinter smelting (that is, ore batch weight Among them, the weight of vanadium-titanium sinter accounts for 85%), quickly reduce [Si] in pig iron to the normal production level (that is, [Si] in pig iron is 0.16%), add air to 85% of the normal air volume, and add air at a rate of 50m 3 / min control, the wind speed is 230m / s, ti...

Embodiment 3

[0036] Using 1750m 3The blast furnace is smelted. Before the blast furnace is opened, enough natural magnetite, vanadium-titanium sintered ore, pellets, coke, limestone and silica are prepared in the blast furnace slot. Use natural magnetite to start the furnace, load the charge into the blast furnace in sections, and control the air volume to 85% of the normal air volume, of which the normal air volume is 3900m 3 / min, after one cycle of air supply smelting, when the [Si] in the pig iron is reduced to about 2%, according to the forward flow of the blast furnace, reduce the air volume to 60% of the normal air volume, and change to 85% for vanadium-titanium sinter smelting (that is, ore batch weight The weight of vanadium-titanium sinter accounts for 85%), quickly reduce [Si] in pig iron to the normal production level (that is, [Si] in pig iron is 0.16%), add air to 90% of the normal air volume, and add air at a rate of 100m 3 / min control, the wind speed is 240m / s, timely adj...

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PUM

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Abstract

The invention relates to a smelting method for converting natural magnetite to vanadium-titanium sinter in a blast furnace and for rapidly reaching design capacity, and belongs to the technical field of blast furnace smelting. The invention aims at providing the smelting method for converting the natural magnetite to vanadium-titanium sinter in the blast furnace and for rapidly reaching the design capacity. The method comprises the steps: carrying out the blow-in by adopting natural magnetite, then controlling the blast capacity at 80 to 85 percent of the normal blast capacity, and smelting for a period; reducing the blast capacity to 55 to 60 percent of the normal blast capacity when Si in pig iron is reduced to 2 percent, converting the smelting of the natural magnetite to the smelting of vanadium-titanium sinter, increasing the blast capacity to be more than 80 percent of the normal blast capacity when Si in the pig iron is reduced to the normal level, adjusting the ore batch weight, coke load and charging system, and enabling the blow-in smelted vanadium-titanium sinter to reach the design capacity by integrating the increment of the air temperature, oxygen-rich coal injection and high-pressure operation. The method is simple to operate, the design capacity can be reached in 3 days after the blow-in of the blast furnace, the time from the blow-in of the blast furnace to the achievement of the design capacity can be shortened, and the production cost is greatly reduced.

Description

technical field [0001] The invention relates to a method for smelting natural magnetite in a blast furnace to convert vanadium-titanium sintered ore to quickly reach production capacity, and belongs to the technical field of blast furnace smelting. Background technique [0002] With the rapid development of the iron and steel industry, the output and quality of metal filler natural rich ore are far from meeting the requirements of blast furnace smelting, while the concentrate powder obtained after a large number of lean ore beneficiation cannot be directly put into the furnace for smelting, and can only be smelted manually. The method is to make these fine ore into blocks of artificial rich ore for use in blast furnaces. At present, the main methods of producing artificial rich ore are sintering and pelletizing, and vanadium-titanium sinter is a common artificial rich ore. The chemical composition of vanadium-titanium sinter is relatively complex, and the removal of TiO fro...

Claims

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Application Information

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IPC IPC(8): C21B5/02
Inventor 张志强石军陆高峰邹仕华林文康毛建林江凌陈利邢志刚袁鹏黄云干显
Owner 攀钢集团西昌钢钒有限公司