Blast-furnace hot metal decarburization method utilizing blast-furnace dust

A technology for blast furnace molten iron and blast furnace ash, which is applied to the processing field of blast furnace molten iron in the process of flipping, and can solve problems such as potential safety hazards, aggravation of carbon-containing dust, molten iron splashing and the like

Active Publication Date: 2020-10-23
NORTHEASTERN UNIV
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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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  • Blast-furnace hot metal decarburization method utilizing blast-furnace dust
  • Blast-furnace hot metal decarburization method utilizing blast-furnace dust
  • Blast-furnace hot metal decarburization method utilizing blast-furnace dust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] In this embodiment, blast furnace ash treated with aerobic roasting is used as a decarburizing agent, which is mixed with blast furnace molten iron to realize decarburization. In this embodiment, the composition of the blast furnace ash sample before roasting is shown in Table 1:

[0057] Table 1

[0058]

[0059]

[0060] Take 500g of the above-mentioned blast furnace ash and roast it at 1250°C for 6 hours in the air environment, and measure the composition of the blast furnace ash after roasting, see Table 2.

[0061] Table 2

[0062] Element Mass percentage Element Mass percentage S 0.310 FeO 1.493 SiO 2

7.481 Tfe full iron 57.619 al 2 o 3

3.353 C 0.000 CaO 3.829 Mfe magnetic iron --- MgO 0.801 Fe 2 o 3

80.65 MnO 0.105 --- --- P 2 o 5

0.193 The remaining undetected parts 1.78

[0063] Take the roasted blast furnace ash in Table 2, mix it with bentonite and an a...

Embodiment 2

[0071] In this example, the roasted blast furnace ash (see Table 2 for the composition) was added to bentonite (bentonite accounts for the total amount of the block decarburizer), an appropriate amount of water was mixed evenly to make a slurry, and pelletized by a disc pelletizer. After drying, the diameter The spherical decarburizing agent is 2 cm in size and dried at 110-120° C. for 3-5 hours to obtain the spherical decarburizing agent. Among them, bentonite accounts for 5% of the mass of the block decarburizer. The preparation process of the decarburizer refers to Example 1.

[0072] The amount of the above-mentioned massive decarburizer is 2% of the mass of molten iron (which does not contain bentonite), and the reaction temperatures of the molten iron for the decarburization reaction are kept at 1330°C, 1390°C, and 1450°C respectively, and each group of temperature experiments is paralleled for 3 times, and the calculation Average of 3 times. The experimental results a...

Embodiment 3

[0077] In this embodiment, the roasted blast furnace ash and iron ore powder are mixed in a mass ratio of 70:3 to make a decarburizer. The composition of iron concentrate powder is shown in Table 5.

[0078] table 5

[0079]

[0080] The composition of the mixture is shown in Table 6 after the fully roasted blast furnace ash and iron concentrate powder are mixed according to the mass ratio of 70:30.

[0081] Table 6

[0082] Element Mass percentage Element Mass percentage S 0.217 FeO 1.201 SiO 2

6.334 Tfe full iron 59.902 Al 2 o 3

2.797 C 0.000 CaO 2.680 Mfe magnetic iron --- MgO 0.561 Fe 2 o 3

84.24 MnO 0.280 --- --- P 2 o 5

0.135 The remaining undetected parts 1.55

[0083] Mix the components in Table 6 with bentonite and an appropriate amount of water to uniformly make a slurry, pelletize through a disc pelletizer, and obtain a spherical decarburizer with a diameter of 2...

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Abstract

The invention relates to a blast-furnace hot metal decarburization method utilizing blast-furnace dust. The method comprises the steps of S1, adopting the blast-furnace dust as a raw material, and preparing a blast-furnace hot metal decarburizer according to one of the following methods: (1) aerobic roasting, and (2) mixing the blast-furnace dust subjected to aerobic roasting and at least one of iron concentrate powder and steel-rolling ferric oxide sheets according to a certain proportion; and S2, mixing the blast-furnace hot metal decarburizer in the form of powder or blocks with blast-furnace hot metal at the reverse installation process, and oxidizing carbon in the hot metal to achieve a decarburization effect, so that the carbonic powder dust produced by hot metal temperature reduction is reduced. By utilizing the method provided by the invention, the problem of serious graphite dust pollution in the reverse installation process of the blast-furnace hot metal in an iron and steelplant is solved from the root. According to the blast-furnace hot metal decarburization method utilizing the blast-furnace dust provided by the invention, the decarburizer adopts the blast-furnace dust as a basic material, so that on one hand, the decarburization processing of blast-furnace taping is effectively realized, the problem of graphite dust pollution produced in the reverse installationprocess of the hot metal is reduced, meanwhile, iron elements in the blast-furnace dust are effectively recycled, and the use value of the blast-furnace dust is improved.

Description

technical field [0001] The invention belongs to the processing technology in the inversion link of blast furnace molten iron in the steelmaking process, and in particular relates to a decarburization method of blast furnace molten iron by using blast furnace ash. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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