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A smelting method for increasing the oxygen supply intensity of the converter in stages

A smelting method and oxygen supply intensity technology, which is applied in the field of smelting to increase the oxygen supply intensity of the converter in stages, can solve the problems of long smelting cycle and unstable control of the terminal components, and achieve shortening of the converter smelting cycle, shortening of oxygen supply time, The effect of convenient production control

Active Publication Date: 2022-03-01
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: The purpose of the invention is to provide a segmented smelting method for increasing the oxygen supply intensity of the converter to solve the problems of long smelting cycle and unstable terminal component control in the existing support method

Method used

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  • A smelting method for increasing the oxygen supply intensity of the converter in stages
  • A smelting method for increasing the oxygen supply intensity of the converter in stages

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The segmented smelting method for increasing the oxygen supply intensity of the converter disclosed by the present invention comprises the following steps:

[0017] (1) The composition of molten iron in the converter is 4.53% carbon, 0.41% silicon, and 0.131% phosphorus, with a weight of 102 tons and a weight of scrap steel of 24.8 tons. The calculated oxygen blowing amount for smelting is 5706Nm 3 ;

[0018] (2) The converter starts igniting and lowering the lance for smelting, and adjusts the position of the oxygen lance by calculating the percentage of oxygen blowing;

[0019] The overall gun position trend is high→low→high→low. The overall gun position trend is high→low→high→low. Adjust according to the percentage of argon blowing, and gradually press the gun to 1300mm for decarburization.

[0020] Table.1 gun position statistics table

[0021] Oxygen blowing percentage% Open Blow -10% 10％-30％ 30％-65％ 65％-85％ 85% - over gun position mm 2000...

Embodiment 2

[0032] The step-by-step operation method for improving the oxygen supply intensity of the converter provided in this embodiment comprises the following steps:

[0033] (1) The composition of molten iron into the converter is 4.57% carbon, 0.41% silicon, and 0.134% phosphorus, with a weight of 103 tons and a weight of scrap steel of 25.53 tons. The calculated oxygen blowing amount for smelting is 5784Nm 3 ;

[0034] (2) The converter starts igniting and lowering the lance for smelting, and adjusts the position of the oxygen lance by calculating the percentage of oxygen blowing;

[0035] The overall gun position trend is high→low→high→low. Adjust according to the percentage of argon blowing, and gradually press the gun to 1300mm for decarburization.

[0036] Table.1 gun position statistics table

[0037] Oxygen blowing percentage% Open Blow -10% 10％-30％ 30％-65％ 65％-85％ 85% - over gun position mm 2000 1550 1550-1750 1750-2000 1700-1300

[0038] (...

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Abstract

The invention discloses a segmented smelting method for increasing the oxygen supply intensity of a converter, comprising the following steps: calculating the amount of oxygen blowing in smelting according to the components of molten iron and scrap steel in the converter and the loading amount; Adjust the position of the oxygen lance by percentage, and adjust the oxygen supply flow according to the percentage of oxygen blowing at the same time; the auxiliary materials for converter smelting are added in steps according to the percentage of oxygen blowing; . The invention ensures the stable control of the end point components, shortens the converter smelting cycle, does not need to modify the design of the oxygen lance and the dust removal system, and after the oxygen supply intensity is increased, the oxygen supply time of the converter is shortened to meet the needs of the converter for oxygen supply, slagging, dephosphorization, and decarbonization. There is no smoke and dust overflow phenomenon, and the production control is convenient.

Description

technical field [0001] The invention relates to an oxygen supply method for converter smelting, in particular to a segmented smelting method for increasing the oxygen supply intensity of a converter. Background technique [0002] The method of oxygen supply in converter smelting has an impact on the control and smelting of the final composition. The existing oxygen supply method is to fix the oxygen supply flow rate and constant oxygen pressure, which has the same disadvantages as the total oxygen consumption and long oxygen supply time. The smelting cycle is long and the final composition Controls are unstable. Contents of the invention [0003] Purpose of the invention: The purpose of the invention is to provide a segmented smelting method for increasing the oxygen supply intensity of the converter, so as to solve the problems of long smelting cycle and unstable terminal component control in the existing support method. [0004] Technical scheme: described in the presen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/30C21C7/00
CPCC21C5/30C21C7/00
Inventor 许旭东刘德祥王军刘呈军林静
Owner NANJING IRON & STEEL CO LTD
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