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Method of regular furnace protection using schreyerite

A vanadium-titanium ore and regular technology, applied in the field of steelmaking, can solve the problems of unsatisfactory blast furnace protection effect and achieve the effect of suppressing the rise of temperature

Active Publication Date: 2016-10-26
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: how to solve the problem that the effect of blast furnace protection is not ideal

Method used

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Embodiment Construction

[0012] 2015-5-24 and 2015-8-31 at 8:00 am, the consumption of vanadium-titanium ore is 65kg / t, and the titanium content in molten iron is increased to 0.15%-0.2%. On 2015-5-25 and 2015-9-1, 20: 00 Stop distributing vanadium-titanium ore when installing wind materials. During the period, the air volume is controlled: 5,800 m3 / min; the oxygen volume: 15,000 m3 / h, to ensure that the heat of slag and iron is sufficient. Changes in the composition of molten iron after vanadium-titanium ore is put into the furnace require corresponding adjustments in steelmaking. Changes in the composition of molten iron include: silicon increases to 0.6-0.8%, titanium content is expected to be 0.2%, and sulfur fluctuations in molten iron increase. Coke load: coke ratio plus coke ratio 360Kg / t, optimize the material system, and eliminate collapsing and slipping materials. The vanadium-titanium ore is placed on the edge of the furnace and put into the 10B warehouse, and the coke is stored in the 11A...

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Abstract

The present invention relates to the field of steelmaking, and specifically to a method of regular furnace protection using schreyerite. The method of regular furnace protection using schreyerite comprises the following steps: step 1, for periodical repair of a blast furnace at an interval of 3-4 months, keeping a blast volume at 5800 m3 / min and an oxygen volume at 1500 m3 / h during a period from 48 hours before damping down to 8 hours before damping down, mixing schreyerite with coke nut and charging the mixture into the furnace, and keeping a temperature of liquid iron in the blast furnace within a range of 1510-1530 DEG C, a silicon content by mass percentage within a range of 0.6%-0.8% and an alkalinity within a range of 1.18-1.22; step 2, during a period from 8 hours before damping down to damping down, stopping adding the mixture of schreyerite and coke nut, and keeping the blast volume at 5800 m3 / min and the oxygen volume at 1500 m3 / h; step 3, reducing the temperature in the furnace below 1350 DEG C after damping down. The method of regular furnace protection using schreyerite is not only effective to long-term effective prevention of rising in the hearth wall temperature, and also significant to long-term stable smooth operation of the blast furnace.

Description

technical field [0001] The invention relates to the field of steelmaking, in particular to a method for regularly using vanadium-titanium ore to protect a furnace. Background technique [0002] After the blast furnace is put into operation, the molten iron and slag will continuously flush the side wall of the blast furnace hearth, especially the hearth brick lining in the iron mouth area. The quality of refractory materials used in different blast furnace hearth parts is different, and the hearth structure is also different. After most blast furnaces have been in operation for 6-8 years, the brick lining on the side wall of the hearth will be eroded to varying degrees, which is manifested in the temperature rise of the thermocouple installed on the side wall of the hearth by more than 400°C, which can be predicted by calculation. The hearth brick lining becomes thinner, and in serious cases, the molten iron will break through the thin brick lining and cause hearth burn-throu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
CPCC21B5/00
Inventor 刘文文王红斌赵新民郑伟唐顺兵张智
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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