Furnace protection process for decarburization converter less slag splashing

A decarburization converter and slag splashing technology for furnace protection, applied in the manufacture of converters, etc., can solve the problems of difficult control of the end point, difficulty in meeting the control level and requirements of Japanese steel mills, insufficient slag splashing and protection of furnace slag, etc.

Inactive Publication Date: 2012-04-25
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] This invention is aimed at the lack of slag splashing to protect the slag after the converter adopts the slag-less smelting process, and it is difficult to con

Method used

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  • Furnace protection process for decarburization converter less slag splashing
  • Furnace protection process for decarburization converter less slag splashing
  • Furnace protection process for decarburization converter less slag splashing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: Furnace age 842 furnaces

[0033] No slag dumping after tapping, 2.07kg / t of the modified agent was added after the converter was shaken, 1.38kg / t was lightly burned, 1.91kg / t of the modified agent was added after 74 seconds of slag splashing, and 2.16kg / t was added after 124 seconds. The nitrogen flow rate is 60000Nm 3 / h. The slag splashing gun was opened at 1.5m, and the slag splashing took 148 seconds to drop to 1.2m to maintain the end point, and the slag splashing time was 5:04. Pour off a small amount of liquid slag after slag splashing, and leave 5-15kg / t of slag in the furnace for continued use in the next furnace smelting.

Embodiment 2

[0034] Embodiment 2: Furnace age 882 furnaces

[0035] No slag dumping after tapping, 1.73kg / t of the modified agent was added after the converter was shaken, 1.81kg / t was lightly burned, 1.5kg / t of the modified agent was added after 59 seconds of slag splashing, and 1.88kg / t was added after 153 seconds. The nitrogen flow rate is 60000Nm 3 / h. The slag splashing gun is opened at 1.5m, and the slag splashing takes 132 seconds to drop to 1.2m to maintain the end point, and the slag splashing time is 5:17. Pour off a small amount of liquid slag after slag splashing, and leave 5-15kg / t of slag in the furnace for continued use in the next furnace smelting.

Embodiment 3

[0036] Embodiment 3: furnace age 971 furnace

[0037] No slag dumping after tapping, 1.78kg / t of the modified agent is added after the converter is shaken, 1.76kg / t is lightly burned, 1.5kg / t of the modified agent is added after 62 seconds of slag splashing, and 1.93kg / t is added after 128 seconds. The nitrogen flow rate is 60000Nm 3 / h. The slag splashing gun is opened at 1.5m, and the slag splashing takes 127 seconds to drop to 1.2m to maintain the end point, and the slag splashing time is 5:12. Pour off a small amount of liquid slag after slag splashing, and leave 5-15kg / t of slag in the furnace for continued use in the next furnace smelting.

[0038] Laser thickness measurement comparison of furnaces (furnace age is 827-969 furnaces)

[0039]

[0040] Note: "-" means the thickness growth of the inner furnace lining during the measurement period.

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Abstract

The invention discloses a furnace protection process for decarburization converter less slag splashing, belonging to the technical field of combined blowing converter steelmaking. In the process, the technical parameters are controlled as follows: molten iron desiliconized, dephosphorized and desulfurized semi-molten steel is adopted for converter smelting without adding steel scrap; the MgO content in the slag is controlled at 11%+/-0.5%; the basicity R of slag is controlled to be greater than or equal to 3.5 and less than or equal to 4.0, the TFe content in the slag is less than or equal to25%; lime is adopted for slagging, and the addition of lime is 15-30% of the MgO content in lightly fired dolomite; before slag splashing, the quantity of remaining slag in a molten bath is greater than the critical quantity of remaining slag (45-55kg/t) for ensuring the slag splashing effect; converting end-point control adopts direct tapping without turning down, and slag splashing is directly performed; low lance position slag splashing is adopted, the slag splashing lance position is kept at a basic converting lance position 1.5m initially, and the lance position is lowered to 1.2m after 50% of the slag splashing time; the slag splashing time is 3-5 minutes; and after slag splashing, the quantity of remaining slag is ensured to be 5-15kg/t, and the quantity of remaining slag in the molten bath during slag splashing in the furnace is ensured to be 45-65kg/t. The invention has the advantage of achieving the aim of prolonging the furnace life.

Description

technical field [0001] The invention belongs to the technical field of combined blowing converter steelmaking, and in particular provides a process for protecting a decarburized converter with less slag splashing and slag splashing. Background technique [0002] The age of the converter is one of the key technical links that affect the production efficiency of the converter and the cost of steelmaking in the converter. If the age of the converter is low, the repairing of the converter will take up more working time, which will greatly reduce the operation rate of the converter. At the same time, due to the low age of the furnace, the consumption of refractory materials for building converters has increased significantly, which has increased the cost of steelmaking. Therefore, steelmaking workers all over the world pay great attention to the process research and development of improving the furnace life of the converter. [0003] In order to greatly increase the furnace life...

Claims

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Application Information

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IPC IPC(8): C21C5/36C21C5/30
Inventor 刘浏佟溥翘阎占辉李金柱张庆国张丙龙郑丛杰余健
Owner CENT IRON & STEEL RES INST
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