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Application method of slag conglomeration agent for desulphurization pre-treatment of molten iron

The technology of molten iron pretreatment and slag aggregation agent is applied in the field of slag aggregation agent for desulfurization in molten iron pretreatment process, which can solve the problems affecting the production and consumption indicators of iron and steel materials, and achieve the effect of improving the desulfurization effect.

Inactive Publication Date: 2013-07-17
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, if the viscosity of the slag after desulfurization is too high, the iron will be taken away along with the slag removal, and the serious iron loss will directly affect the output and the consumption index of iron and steel materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1: The temperature of molten iron is 1310°C, and the amount of molten iron is 90t. The time for adding the slag-accumulating agent is 2 minutes before the end of desulfurization, the amount of the slag-accumulating agent is 110 kg, and the main chemical composition of the slag-accumulating agent is: SiO 2 69.1% by weight, Al 2 o 3 16.2% by weight, CaF 2 11.5% by weight, 2.8% by weight of CaO, and the rest are impurities. The desulfurization rate of molten iron is 89.6%.

Embodiment 2

[0011] Embodiment 2: The temperature of molten iron is 1290° C., and the amount of molten iron is 85 t. The time for adding the slag-accumulating agent is 2.5 minutes before the end of desulfurization, the amount of the slag-accumulating agent is 100 kg, and the main chemical composition of the slag-accumulating agent is: SiO 2 65.2% by weight, Al 2 o 3 18.4% by weight, CaF 2 14.1% by weight, 1.7% by weight of CaO, and the rest are impurities. The desulfurization rate of molten iron is 88.4%.

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Abstract

The invention relates to an application method of a slag conglomeration agent for desulphurization pre-treatment of molten iron. The invention is characterized in that the slag conglomeration agent comprises the following components in percentage by weight: 50-70% of SiO2, 15-20% of Al2O3, 8-17% of CaF2, 1-3% of CaO and the balance of impurities; the slag conglomeration agent is added 1-3min before desulphurization is finished; temperature of molten iron is 1280-1350 DEG C; and addition of the slag conglomeration agent is 1.0-2.0kg per ton of iron. The application method provided by the invention has the advantages that components of the slag conglomeration agent are optimized and adding time and addition amount of the slag conglomeration agent are improved on the basis of the original components of the slag conglomeration agent, and molten iron desulphurization effect is improved without increasing iron loss, so that the average desulphurization degree of molten iron is increased to 88.1% from the original 81.3% (test data for 100 furnaces).

Description

technical field [0001] The invention relates to a method for using a slag accumulating agent for desulfurization in a molten iron pretreatment process, and belongs to the field of steelmaking produced in the metallurgical industry. Background technique [0002] The hot metal pretreatment technology in the domestic iron and steel industry, especially the pre-desulfurization process, has been widely used, and the method of injecting lime and magnesium particles is usually used. However, the slag produced after desulfurization of molten iron is relatively thin, and a slag accumulator with a reasonable composition must be added at an appropriate time to make the viscosity and lumpiness of the desulfurized slag moderate, which is convenient for the slag remover to remove the slag to prevent molten steel from resulfurization. On the other hand, if the viscosity of the slag after desulfurization is too high, the iron will be taken away with the slag removal, and the serious iron lo...

Claims

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Application Information

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IPC IPC(8): C21C1/02
Inventor 李峰韩春鹏
Owner INNER MONGOLIA BAOTOU STEEL UNION
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