Method for adjusting furnace charge structure before damping-down period of blast furnace for smelting high-titanium schreyerite

An adjustment method and technology of vanadium-titanium ore, applied in blast furnaces, blast furnace details, furnaces, etc., can solve problems such as abnormal furnace conditions, failure of furnace conditions to recover, affecting blast furnace technical and economic indicators, etc.

Active Publication Date: 2015-06-10
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the wind-off period, the reaction conditions and time for the newly generated slag-iron reaction are sufficient. If the conditions for suppressing the generation of foamy slag are not well controlled, when the blast furnace resumes production by air supply, the furnace condition will be abnormal due to the existence of a large amount of foamy slag, or the furnace will be abnormal for a long time. Furnace conditions cannot be recovered, seriously affecting blast furnace technical and economic indicators

Method used

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  • Method for adjusting furnace charge structure before damping-down period of blast furnace for smelting high-titanium schreyerite
  • Method for adjusting furnace charge structure before damping-down period of blast furnace for smelting high-titanium schreyerite
  • Method for adjusting furnace charge structure before damping-down period of blast furnace for smelting high-titanium schreyerite

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Effect test

Embodiment 1

[0038] at 1750m 3 The blast furnace is scheduled to have a wind break for 6 hours on the second day, and the wind break starts at 8:00 the next day. The specific examples are as follows:

[0039] Step 1: Calculation of Furnace Ratio

[0040] The charge structure before the material change is: 14% pellets + 3% lump ore + 83% sintered ore, the ore batch weight is 45 tons, and the coke load is 4.4 tons / ton; the charge distribution parameters are α 36 34 33 31.5 29.5 27.5 22.5 0 0 1 3 3 3 0 ...

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Abstract

The invention belongs to the technical field of schreyerite blast furnace smelting, and particularly relates to a method for adjusting a furnace charge structure before a long damping-down period (the damping-down period is longer than five hours and shorter than five days) of a blast furnace for smelting high-titanium schreyerite. The method for adjusting the furnace charge structure before the damping-down period of the blast furnace for smelting the high-titanium schreyerite includes the step that in the smelting period before the damping-down period of the blast furnace, the furnace charge structure is adjusted to enable slag newly generated in the damping-down period of the blast furnace to meet the conditions that the content of TiO2 ranges from 1% to 20%, the binary alkalinity (CaO/SiO2) of the slag ranges from 1.00 to 1.03, the content of CaF2 ranges from 0.50% to 2.0%, and the content of MnO2 ranges from 1.0% to 4%. By means of the method, after damping-down overhauling is completed, the air volume can be rapidly (a period with the length 1 time to 1.5 times that of the damping-down period is needed) recovered to the air volume required by normal production.

Description

technical field [0001] The invention belongs to the technical field of blast furnace smelting of vanadium-titanium ore, and in particular relates to a method for adjusting the structure of a charge before a blast furnace for smelting high-titanium vanadium-titanium ore is shut down for a long time (the shut-off time is greater than 5 hours but less than 5 days). Background technique [0002] Blast furnace smelting high-titanium vanadium-titanium ore, TiO in normal slag 2 The content is 21-30%, TiO in the slag 2 The higher the content, the TiO 2 The residence time in the furnace is too long, TiO 2 It is over-reduced to generate TiC, TiN and Ti(C, N) with high melting point, and these high melting point substances are bonded in the hearth; in the interactive reaction of slag-iron and slag-coke in the furnace, TiO 2 And FeO is reduced by C to generate CO gas, which provides a prerequisite for the generation of foamy slag in the blast furnace. TiO 2 , TiC, TiN and Ti(C, N) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
Inventor 林文康石军陆高峰邹仕华毛建林江凌陈利刘军孙小勇文贵江干显张志强
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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