Methods of Improving Utilization Rate of Vanadium-Titanium Blast Furnace Gas

Abstract

The invention provides a method for increasing the schreyerite blast-furnace gas utilization rate. The method comprises the steps that a blast-furnace material structure is controlled to comprise 70%-80% of sintered ore, 10%-30% of pellets and 0-10% of lump ore; the ore batch weight is controlled to be 16-32t / 1000 m<3> furnace volume, the coke load is controlled to be 3.0-5.5 t / t, and the charge line is controlled to be 1.0-2.0 m; middle ring band coke of a charge distribution matrix is controlled to be neutral by one gear, and the number of turns of the middle ring band coke is smaller than that of inner ring and outer ring coke by 2 to 3; and the outer ring angle difference between ore and coke is controlled to range from 0 to 2 degrees, the ore charge distribution ring number is controlled to range from three to five, the width of an ore platform is controlled to range from 3 degrees to 8 degrees, the number of turns of each ring of ore is controlled to range from 2 to 4, the number of rings of coke is controlled to range from 5 to 7, the coke outer rings are controlled to range from 2 to 4, and the coke inner rings are controlled to range from 3 to 4. According to the method, stable gas flow distribution can be formed in the center and the edge of a blast furnace, and furnace top cross temperature measurement is in a stable and reasonable inverted V shape; and the furnace condition is stable and smooth for a long time, and the gas utilization rate can be increased.

Description

technical field [0001] The invention relates to the technical field of vanadium-titanium ore blast furnace smelting technology, in particular to a method for improving the utilization rate of vanadium-titanium ore blast furnace gas. Background technique [0002] At present, the utilization rate of blast furnace gas in blast furnace smelting vanadium-titanium magnetite technology in Panxi area is at a relatively low level of 41-43%, and the low utilization rate of blast furnace gas is the core link that restricts energy saving and emission reduction of blast furnaces, restricting the utilization of blast furnace gas in vanadium-titanium ore The technical background of the rate increase is as follows: [0003] (1) Slag TiO 2 The content is high, and the blast furnace smelting operation is difficult. Slag TiO 2 Up to 21-24%, TiO in slag under blast furnace reducing conditions 2 It is reduced to TiC, TiN, Ti(C,N) and other high melting point substances. These high-melting-p...

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Problems solved by technology

These high-melting-point substances are dispersed in the slag, causing the slag to become viscous, which seriously affects the air permeability of the blast furnace charge column, and is not conducive to the improvement of the blast furnace gas utilization rate.

[0004] (2) The grade of vanadium-titanium magnetite is low and the amount of slag is large

The blast furnace ore grade is at a low level of 48-51%, and the slag content reaches 600-700kg / t, which is not conducive to the improvement of blast furnace gas utilization rate

[0005] (3) The particle size distribution of vanadium-titanium sinter is uneven, and the proportion of small particle size and large particle size is relatively high

This feature makes ore segregation serious during the blast furnace material distribution process, which easily causes fluctuations in furnace conditions and makes it difficult to increase the utilization rate of blast furnace gas

[0006] (4) The original blast furnace charging system does not conform to the particle size characteristics of vanadium-titanium ore

[0007] The above characteristics cause the air flow in the center of the blast furnace to be unstable, the edge air flow is easy to develop, and abnormal furnace conditions such as blast furnace pipeline stroke and hearth center accumulation frequently occur, and the utilization rate of blast furnace gas has always been at a low level of 41-43%.

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