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A decarburization treatment method for blast furnace molten iron based on converter LT dedusting

A treatment method, blast furnace molten iron technology, applied in the field of decarbonization of blast furnace molten iron based on converter LT dust removal ash, can solve the problems of aggravating carbon-containing dust, molten iron splashing, large heat loss, etc., to alleviate pollution problems, reduce analysis The effect of carbon content and slow desorption of carbon

Active Publication Date: 2021-12-03
NORTHEASTERN UNIV LIAONING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technology has achieved remarkable results in decarbonizing molten iron, there are still the following problems: (1) it uses iron concentrate powder as a decarburizing agent, and the cost is relatively high; (2) it directly adds iron at room temperature to the molten iron Diantan slag powder causes the temperature of molten iron to drop by about 20°C, resulting in a large heat loss and aggravating the generation of carbon-containing dust
(3) When iron concentrate powder is used on site, the Diantan mineral powder packed in woven bags is manually added to the iron trench when the molten iron comes out of the blast furnace, which will easily cause molten iron splashing, material loss and potential safety hazards

Method used

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  • A decarburization treatment method for blast furnace molten iron based on converter LT dedusting
  • A decarburization treatment method for blast furnace molten iron based on converter LT dedusting
  • A decarburization treatment method for blast furnace molten iron based on converter LT dedusting

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In this embodiment, converter LT dedusting ash is used as a decarburizing agent, which is mixed with blast furnace molten iron to realize decarburization. In this embodiment, the composition of converter LT dedusting ash sample is:

[0043] Element Mass percentage Element Mass percentage S 0.069 Tfe full iron 59.49 SiO 2

1.63 C 1.53 al 2 o 3

0.36 Mfe magnetic iron -- CaO 8.12 Fe 2 o 3

52.23 MgO 4.19 ZnO trace MnO 0.426 Na 2 o

trace P 2 o 5

0.199 K 2 o

trace FeO 29.48 The remaining undetected parts 1.77

[0044] The particle size of the converter LT dedusting ash is 10-50 microns. A certain amount of the above-mentioned converter LT dedusting ash is fully mixed with bentonite and water to make a slurry and pressed into a block, and dried at 110-120°C for 3-5 Hour, obtain the decarburizing agent of cylindrical block, and diameter is 1cm, height 1.5cm. ...

Embodiment 2

[0051] In this embodiment, converter LT dedusting ash is used as a decarburizing agent, which is mixed with blast furnace molten iron to achieve decarburization, and the composition, specifications, and briquetting steps of converter LT dedusting ash are the same as those in Example 1. During the measurement, each sample was tested three times and the average value was taken.

[0052] In this example, the influence of converter LT dedusting ash as a decarburizing agent on the decarburization effect of molten iron is studied at different temperatures. Specifically, the temperature of the molten iron for maintaining the decarburization reaction was 1420°C, 1450°C, and 1480°C, respectively, and in each temperature experiment, the amount of dedusting ash of the converter LT was 4% of the mass of the molten iron. The experimental results are recorded in Table 2.

[0053] Table 2

[0054]

[0055] It can be seen from the above table that when the amount of dedusting ash in conv...

Embodiment 3

[0057] In this example, converter LT dedusting ash and iron concentrate powder (Brazilian iron ore concentrate powder) are mixed according to the mass ratio of 80:20 as a decarburizer, and the composition, specifications, and briquetting steps of converter LT dedusting ash are the same as in Example 1 same. The composition of iron concentrate powder is as follows:

[0058]

[0059] In this example, the influence of different amounts of decarburizers on the decarburization effect of molten iron is studied, specifically adding 3% and 4% (converter LT dedusting ash + iron concentrate powder mass and the mass percentage of molten iron) to molten iron. Block decarburizer (made from converter LT dedusting + iron concentrate powder, 5% bentonite briquette), keep the temperature of molten iron at 1450°C. The experimental results are recorded in Table 3.

[0060] table 3

[0061]

[0062] It can be seen from the above table that the ideal carbon reduction effect can also be ac...

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Abstract

The invention relates to a blast furnace molten iron decarburization treatment method based on converter LT dedusting ash. The method is as follows: the converter LT dedusting ash is used as a decarburizing agent and mixed with molten iron from the blast furnace, and the carbon in the molten iron is oxidized to achieve the purpose of decarburization , to reduce the carbon-containing dust generated by the temperature drop of molten iron. The invention reduces the content of carbon in molten iron by adding converter LT dedusting ash into blast furnace tapping as a decarburizing agent, and fundamentally solves the problem of graphite dust pollution in the inversion of molten iron in iron and steel plants. The decarburizing agent is converter LT dedusting ash in steelmaking plants, which has a significant decarburization effect on molten iron in blast furnaces, can reduce the amount of carbon precipitation in molten iron, alleviate the problem of graphite dust pollution in steelmaking plants, make full use of waste resources, and recycle converter LT dedusting ash iron, which improves the utilization value of converter LT dedusting ash.

Description

technical field [0001] The invention belongs to the technical field of molten iron pretreatment in the steelmaking process, and in particular relates to a blast furnace molten iron decarburization treatment method based on converter LT dedusting. Background technique [0002] The energy consumption and environmental load of iron and steel enterprises are closely related to the technological process required for production. On the basis that the current steel production process is basically becoming mature and stable, continuous improvement of the "interface" technology between equipment is an effective measure to optimize production indicators. Among them, the "interface" between the blast furnace and the converter (mixed iron furnace) is particularly important, and is usually called the "iron-steel interface". The "iron-steel interface" includes many links such as molten iron from the blast furnace, transportation of molten iron, and pretreatment. During this process, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/068
CPCC21C7/068
Inventor 曲迎霞邹宗树王春松邵磊
Owner NORTHEASTERN UNIV LIAONING
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