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Method for smelting and reducing iron ores through converter steelmaking system

A converter steel and iron ore technology, applied in the direction of manufacturing converters, etc., can solve the problems of high production energy consumption, inconvenient promotion and use, high smelting cost, and achieve the effect of improving stability and solving the problem of furnace lining life.

Active Publication Date: 2016-07-27
TIANJIN TIANGANG UNITED SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned applications are all good non-blast furnace ironmaking technologies, but the above-mentioned applications have poor operational stability, are difficult to control, or have high smelting costs and high energy consumption for production, which is not easy to promote and use, and still needs further improvement

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  • Method for smelting and reducing iron ores through converter steelmaking system
  • Method for smelting and reducing iron ores through converter steelmaking system

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Embodiment 1

[0031] A method of smelting and reducing iron ore using a converter steelmaking system in this embodiment, the main components of the selected molten iron and the mass percentages of the iron ore components are shown in Table 1 and Table 2:

[0032] Table 1 The main components of molten iron

[0033]

[0034] The mass percent of table 2 iron ore composition

[0035]

[0036] The technological operation process of this embodiment is as follows: after the converter is splashed with slag to protect the furnace, 70t of molten iron accounting for 70% of the tonnage of the converter is mixed into the converter. When blowing starts, the oxygen lance position is 1100mm, which is 55mm lower than the normal lance position. Within 1-3 minutes of blowing, 2t of iron ore, 1.5t of limestone and 1.5t of dolomite are added, and the particle size of iron ore is 10-50mm. Moisture <2%, return to normal gun position after 3 minutes. Continuously add iron ore, limestone and dolomite in batch...

Embodiment 2

[0038] The process of the present embodiment is as follows: after the converter is protected by slag splashing, 80t of molten iron accounting for 80% of the tonnage of the converter is mixed into the converter. When blowing starts, the position of the oxygen lance is 50mm lower than the normal one. Within 1-3 minutes of blowing, add 1.5t of iron ore, 1t of limestone and 1t of dolomite. , and return to the normal gun position after 3 minutes. Continuously add iron ore, limestone and dolomite in batches. The timing and amount of adding iron ore, limestone and dolomite are based on the thickness of the foam slag layer, so that the thickness of the foam slag is moderate and the distance between the foam slag layer and the furnace mouth is kept 300~600mm. Specifically, each batch of iron ore in this embodiment is 1.5t, each batch of limestone is 200kg, and each batch of dolomite is 200kg. Among them, when adding iron ore, lift the gun 25mm, and return to the normal gun position a...

Embodiment 3

[0040] The technological operation process of this embodiment is as follows: after the converter is splashed with slag to protect the furnace, firstly, 60 tons of molten iron is mixed into the converter, accounting for 60% of the capacity of the converter. When blowing starts, the position of the oxygen lance is 100mm lower than the normal one. Within 1-3 minutes of blowing, add 3t of iron ore, 2t of limestone and 1t of dolomite. Return to normal gun position after 3 minutes. Continuously add iron ore, limestone and dolomite in batches. The timing and amount of adding iron ore, limestone and dolomite are based on the thickness of the foam slag layer, so that the thickness of the foam slag is moderate and the distance between the foam slag layer and the furnace mouth is kept 300~600mm. Specifically, in this embodiment, each batch of iron ore is 1 ton, each batch of limestone is 400 kg, and each batch of dolomite is 400 kg. Among them, when adding iron ore, lift the gun 20mm, ...

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Abstract

The invention discloses a method for smelting and reducing iron ores through a converter steelmaking system and belongs to the technical field of iron and steel metallurgy. After the converter slag splashing converter protection process, molten iron is mixed into a converter firstly, then the iron ores and a slag forming agent are added in batches, wherein the adopted slag forming agent comprises limestone, dolomite and lime; and oxygen-enriched air and pulverized coal are simultaneously top-blown through an oxygen lance, the thickness of foaming slag is controlled by adjusting the charging speed, and the iron ores are smelted and reduced. The method is based on the modern mature technology of oxygen converters, the iron ores are smelted and reduced in the converter process, and the problems of too fast lining erosion and high energy consumption cost existing in iron ore direct smelting and reducing at present can be solved.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, and more specifically relates to a method for smelting and reducing iron ore using a converter steelmaking system. Background technique [0002] Most of the processing and utilization of iron ore in my country adopts the traditional sintering-blast furnace process to produce molten iron. With the depletion of coke resources and the serious pollution in the coking and sintering process, blast furnace production is also facing a crisis. Therefore, the development of non-blast furnace smelting technology has been imminent. [0003] The advantages of non-blast furnace ironmaking technology are to get rid of the shackles of the shortage of coking coal resources on the development of the iron and steel industry, adapt to the increasing environmental protection requirements, reduce energy consumption in iron and steel production, improve the structure of iron and steel products, improve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00C21C5/32
CPCC21B13/0006C21C5/32
Inventor 范鼎东沈乾坤陶素芬周庆子刘威邓爱军
Owner TIANJIN TIANGANG UNITED SPECIAL STEEL CO LTD
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