Magnesium desulphurization method for molten iron pretreatment and powder used thereby

A technology of molten iron pretreatment and desulfurization accelerator, applied in the field of iron and steel metallurgy, can solve the problems of lime powder splashing, personal accident, unsatisfactory effect, etc.

Inactive Publication Date: 2008-04-16
INST OF METALLURGICAL TECH DONGBEI UNIV SHENYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] First of all, the melting point of lime powder is relatively high. Generally, the slag formed after blowing is mostly solid, and the iron beads splashed out during blowing desulfurization will be mixed in it, which cannot penetrate the solidified slag layer and return to molten iron. , so the iron loss of slag removal is relatively serious. For this reason, many metallurgists have developed a variety of thinner slag agents to reduce the viscosity of slag and reduce iron loss, but the effect is not ideal in practical applications.
[0005] Secondly, lime powder is prone to splashing when it enters molten iron
On the one hand, lime powder is very easy to absorb moisture. Once the moisture-absorbing powder reaches a certain amount and is sprayed in

Method used

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  • Magnesium desulphurization method for molten iron pretreatment and powder used thereby
  • Magnesium desulphurization method for molten iron pretreatment and powder used thereby

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Effect test

Embodiment 1

[0044] Implement the molten iron pretreatment method that this invention completes on the 150 tons of molten iron ladle of A iron and steel enterprise, iron temperature (in the ladle) 1350 ℃, adopt composite injection powder technology. The chemical composition of the pre-melted magnesium desulfurization accelerator used is shown in Table 3:

[0045] Chemical composition of premelted magnesium desulfurization accelerator 2 Table 3

[0046] ingredient name

[0047] Fluidized pre-melted magnesium desulfurization accelerator is mixed with metal magnesium in a mixing ratio of 3:1. After the mixed powder is prepared, it is sprayed into molten iron. The test results count 100 bags, and the average original sulfur content of molten iron is 0.035%. , the average injection time is 10min; the powder dosage is 2.0kg / t; the average temperature drop is 13°C; the sampling analysis [S] average is 0.003%; No large-scale splashing occurs; it is obviously better than lime-based powde...

Embodiment 2

[0049] Implement the molten iron pretreatment method that this invention completes on the 150 tons of molten iron ladle of A iron and steel enterprise, iron temperature (in the ladle) 1350 ℃, adopt composite injection powder technology. The chemical composition of the pre-melted magnesium desulfurization accelerator used is shown in Table 4:

[0050] Chemical composition of premelted magnesium desulfurization accelerator 2 Table 4

[0051] ingredient name

[0052] Fluidized pre-melted magnesium desulfurization accelerator is mixed with metal magnesium in a mixing ratio of 3:1. After the mixed powder is prepared, it is sprayed into molten iron. The test results count 100 bags, and the average original sulfur content of molten iron is 0.035%. , the average injection time is 10min; the powder dosage is 2.0kg / t; the average temperature drop is 13°C; the sampling analysis [S] average is 0.003%; No large-scale splashing occurs; it is obviously better than lime-based powde...

Embodiment 3

[0054] Implement the molten iron pretreatment method that this invention completes on the 150 tons of molten iron ladle of A iron and steel enterprise, iron temperature (in the ladle) 1350 ℃, adopt composite injection powder technology. The chemical composition of the pre-melted magnesium desulfurization accelerator used is shown in Table 5:

[0055] Chemical composition of premelted magnesium desulfurization accelerator 2 Table 5

[0056] ingredient name

[0057] Fluidized pre-melted magnesium desulfurization accelerator is mixed with metal magnesium in a mixing ratio of 3:1. After the mixed powder is prepared, it is sprayed into molten iron. The test results count 100 bags, and the average original sulfur content of molten iron is 0.035%. , the average injection time is 10min; the powder dosage is 2.0kg / t; the average temperature drop is 13°C; the sampling analysis [S] average is 0.003%; No large-scale splashing occurs; it is obviously better than lime-based powde...

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Abstract

The invention belongs to the steel metallurgic technical field and in particular relates to a hot metal pretreatment magnesium desulfurization method and the adopted powder, wherein, the powder comprises magnesium metal powder and is characterized in that the powder also comprises premelting magnesium desulfurization accelerating agent which is made from blast furnace slag and lime through production processes such as raw material selection, impurity removal and drying, mix crushing and passivating treatment; by means of the prior blowing equipment, the magnesium metal powder and the premelting magnesium desulfurization accelerating agent are mixed according to a certain proportion or are jointly injected into hot metal for desulfurization. The method is simple and feasible and the made powder can replace pure lime powder, therefore, the invention has the advantages of energy saving, high efficiency and environmental protection; moreover, the method can greatly reduce the pretreatment cost of hot metal and increases hot metal yield.

Description

technical field [0001] This application belongs to the technical field of iron and steel metallurgy, and specifically relates to a magnesium desulfurization method for pretreatment of molten iron and the powder used. Background technique [0002] As an important process link in iron and steel smelting, hot metal pretreatment has been generally recognized by the iron and steel metallurgy industry. Hot metal pretreatment includes desiliconization, dephosphorization and desulfurization, but at present, only a few enterprises in China such as Baoshan Iron and Steel Company are implementing the "three desulfurization" process, and most iron and steel enterprises use single desulfurization, and generally use powder spraying method or KR stirring Law. In the powder spraying method, the selection of powder is very important. The commonly used powders include metal magnesium powder, calcium carbide series powder, AD powder and CaO series powder, etc. Among them, the most widely use...

Claims

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Application Information

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IPC IPC(8): C21C7/064
Inventor 孙中强
Owner INST OF METALLURGICAL TECH DONGBEI UNIV SHENYANG
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