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.
CN104694682AActive Publication Date: 2015-06-10PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
Publication Date
2015-06-10

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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.
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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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