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Method for improving desulphurization efficiency of blast-furnace slag

A technology for desulfurization efficiency and blast furnace slag, applied in blast furnaces, blast furnace details, furnaces, etc., can solve problems such as reduced energy utilization, increased slag alkalinity, and increased slag viscosity, so as to improve the performance of primary slag and reduce sulfur entering the furnace Load and the effect of lowering the fuel ratio

Inactive Publication Date: 2017-05-24
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the desulfurization efficiency, the following problems usually occur: the alkalinity of slag increases, resulting in the increase of slag viscosity, poor stability, and difficulty in blast furnace operation.
However, increasing the furnace temperature leads to a decrease in energy utilization and an increase in cost

Method used

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  • Method for improving desulphurization efficiency of blast-furnace slag
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  • Method for improving desulphurization efficiency of blast-furnace slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: The method for improving the desulfurization efficiency of blast furnace slag adopts the following specific processes.

[0028] Blast furnace effective volume 1000m 3 , the molten iron temperature is 1495°C, the Si content in molten iron is 0.5wt%, the binary basicity of slag is 1.2, the ternary basicity of slag is 1.4, and the MgO content is 7.5wt%; other parameters and indicators are normal values.

[0029] Sintered ore into the furnace: FeO content 9wt%, SiO 2 Content 5.5wt%; reducing index 60%; other parameters and indexes are normal.

[0030] Furnace pellets: FeO content 0.5wt%, SiO 2 Content 8wt%, MgO content 0.5wt%, alkalinity 0.2, reducibility index 60%; other parameters and indexes are normal values.

[0031] The sulfur load into the blast furnace is 4kg / t-Fe, and the sulfur content in molten iron is less than 0.03wt%, which is qualified.

Embodiment 2

[0032] Embodiment 2: The method for improving the desulfurization efficiency of blast furnace slag adopts the following specific processes.

[0033] Blast furnace effective volume 1000m 3 , molten iron temperature 1500 ℃, molten iron Si content 0.55%; slag binary alkalinity 1.22, triple alkalinity 1.45, MgO content 7.5%; other parameters and indicators are normal.

[0034] Sintered ore into the furnace: FeO content 9%, SiO 2 Content 5.5%; reducing index 60%; other parameters and indicators are normal.

[0035] Furnace pellets: FeO content 0.5%, SiO 2 Content 8%, MgO content 0.5%, alkalinity 0.2, reducibility index 60%; other parameters and indexes are normal.

[0036] The sulfur load of the blast furnace is 4.5kg / t-Fe, and the sulfur content of the molten iron is less than 0.03%, which is qualified.

Embodiment 3

[0037] Embodiment 3: The method for improving the desulfurization efficiency of blast furnace slag adopts the following specific processes.

[0038] Blast furnace effective volume 1000m 3 , molten iron temperature 1500 ℃, molten iron Si content 0.55%; slag binary alkalinity 1.2, triple alkalinity 1.5, MgO content 10%; other parameters and indicators are normal.

[0039] Sintered ore into the furnace: FeO content 9%, SiO 2 Content 5.5%. Restorative indicators: 60%; other parameters and indicators are normal.

[0040] Furnace pellets: FeO content 0.5%, SiO 2 Content 8%, MgO content less than 0.5%, alkalinity less than 0.2, reducing index: 60%. Other parameters and indicators were normal.

[0041] When the sulfur load into the blast furnace is 5kg / t-Fe, the sulfur content of molten iron is less than 0.03%, which is qualified.

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Abstract

The invention discloses a method for improving desulphurization efficiency of blast-furnace slag. The technology is that during the desulphurization process of blast-furnace smelting, the temperature of blast-furnace melted iron is controlled to be 1450 DEG C to 1550 DEG C, the content of Si in melted iron is 0.2 wt% to 0.8 wt%, binary basicity of slag is 1.0 to 1.3, ternary basicity of slag is 1.3 to 1.6, and the content of MgO in slag is 5 wt% to 12 wt%. According to the method, the slag desulphurization efficiency in zones above a hearth can be improved, desulphurization burden in the hearth zone is reduced, the energy utilization efficiency is improved, and fuel ratio is decreased; when the load of sulfur entering the furnace is increased, the slag desulphurization efficiency is improved and stable and smooth operation of a blast furnace is guaranteed through optimization of components and performances of iron-bearing raw materials and improvement of the slagging process of the blast furnace; selection ranges of coke and coal dust can be further expanded, and the purchase cost is reduced; and the method has the characteristics of being high in operability, simple in technology and easy to achieve.

Description

technical field [0001] The invention belongs to the field of blast furnace ironmaking, in particular to a method for improving the desulfurization efficiency of blast furnace slag. Background technique [0002] The current domestic iron and steel situation is extremely severe. In order to reduce production costs, the quality of raw fuel for blast furnaces has declined. Among them, the sulfur content in raw fuel has increased significantly. Sulfur is a harmful element in iron and steel products, and its content in molten iron has strict requirements. Therefore, blast furnace ironmaking must control the quality of raw materials and operating systems, so as to ensure the quality of molten iron. According to the principle of ironmaking, the sulfur in the raw fuel is mainly removed by the blast furnace slag, and the factors affecting the desulfurization efficiency of the slag mainly include: furnace temperature, slag basicity, FeO content in the slag and slag amount. At present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/04
CPCC21B5/04
Inventor 高冰肖洪张文强曹维超宋立明魏尧贾凤娟李晓云
Owner TANGSHAN IRON & STEEL GROUP
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