Processing method for decarbonization of blast furnace molten iron based on converter LT dust-removing ash

A treatment method and blast furnace molten iron technology, which is applied in the field of blast furnace molten iron decarburization treatment based on converter LT dedusting ash, can solve problems such as potential safety hazards, large heat loss, and molten iron splashing

Active Publication Date: 2020-10-27
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 ...

Method used

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  • Processing method for decarbonization of blast furnace molten iron based on converter LT dust-removing ash
  • Processing method for decarbonization of blast furnace molten iron based on converter LT dust-removing ash
  • Processing method for decarbonization of blast furnace molten iron based on converter LT dust-removing ash

Examples

Experimental program
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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 processing method for the decarbonization of blast furnace molten iron based on converter LT dust-removing ash. The method includes the steps that the converter LT dust-removing ash, as a decarbonizer, is mixed with the molten iron from a blast furnace to oxidize the molten iron to achieve the decarbonization of the molten iron, so as to reduce carbonaceous dust producedby the drop of the temperature of the molten iron. The processing method for the decarbonization of the blast furnace molten iron based on the converter LT dust-removing ash lowers the content of carbon in the molten iron by adding the converter LT dust-removing ash as the decarbonizer to the molten iron from the blast furnace, so as to fundamentally solve the graphite dust pollution problem caused in the molten iron backward-pouring process in a steel plant. The decarbonizer is the converter LT dust-removing ash from a steel mill. The converter LT dust-removing ash has obvious effect on decarbonizing the blast furnace molten iron, and reduces the content of carbon separated out of the molten iron, so as to alleviate the problem of the graphite dust pollution in the steel mill. Therefore,waste resources are fully used, iron from the converter LT dust-removing ash is recovered, and the utilization value of the converter LT dust-removing ash is improved.

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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IPC IPC(8): C21C7/068
CPCC21C7/068
Inventor 曲迎霞邹宗树王春松邵磊
Owner NORTHEASTERN UNIV
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