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Blowing-method molten iron pre-desulfuration process not using fluidized lime or passivated magnesium

A pre-desulfurization and lime technology for molten iron, applied in the field of iron and steel metallurgy, to achieve the effect of reducing processing costs and shortening processing time

Inactive Publication Date: 2018-03-23
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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There are no technical reports and patents on the injection method of hot metal pre-desulfurization process that does not use fluidized lime and passivated magnesium

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  • Blowing-method molten iron pre-desulfuration process not using fluidized lime or passivated magnesium
  • Blowing-method molten iron pre-desulfuration process not using fluidized lime or passivated magnesium

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Embodiment 1- Embodiment 23

[0021] A pre-desulfurization process of molten iron by injection method without fluidized lime and passivated magnesium, comprising the following steps:

[0022] 1) At the tapping position of the torpedo tank, add self-produced refined lime with a total amount of 6-10kg per ton of iron into the molten iron ladle in two batches, and add 0.3-0.6kg / t of aluminum particles when tapping 2 / 3 of the iron.

[0023] 2) When the molten iron ladle reaches the injection treatment position, nitrogen gas is blown into the molten iron pool by lowering the lance for 12-15 minutes. The insertion depth of the top lance is 1000-1800mm. During the strong stirring, the insertion depth of the top lance changes from deep to shallow. Every 3 minutes, the top gun is lifted up 200mm, and the stirring gas flow rate is 100-200m 3 / h: working pressure: 0.6 ~ 0.8Mpa.

[0024] 3) After the strong stirring is over, continue to lower the gun to 1800mm and stir weakly for 2-5 minutes, and the stirring gas flo...

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Abstract

The invention provides a blowing-method molten iron pre-desulfuration process not using fluidized lime or passivated magnesium. The blowing-method molten iron pre-desulfuration process comprises the following steps: (1) fine lime is added into a ladle at a tapping site of a torpedo ladle in batches, and aluminum particles are added when 2 / 3 iron is tapped; (2) when the ladle reaches a blowing treatment site, a gun is lowered to blow nitrogen into a molten iron bath for strong stirring; (3) after finish of strong stirring, the gun is continually lowered to 1800 mm for weak stirring; and (4) after finish of weak stirring, sampling is performed, standing is performed for 3-5 min, and drossing is performed at a molten iron drossing site. Compared with the prior art, the molten iron pre-desulfuration process which does not use fluidized lime on traditional blowing-method molten iron pre-desulfuration equipment can guarantee the same desulfuration effect, uses fine lime produced by metallurgy enterprises to replace fluidized lime, and a few of aluminum particles are added to replace passivated magnesium. Compared with a traditional blowing-method molten iron pre-desulfuration process, the provided blowing-method molten iron pre-desulfuration process has the advantages that the treatment time can be shortened by 3-5 min, and the treatment cost of per ton iron is lowered by 11.0-15.0 Yuan / ton iron.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to an economical blowing molten iron pre-desulfurization process. Background technique [0002] Usually, the desulfurizers for the pre-desulfurization of molten iron by injection method are fluidized lime and passivated magnesium. Nitrogen is used as the carrier gas to mix and inject fluidized lime and passivated magnesium or single-spray passivated magnesium from the spray gun, and then enter the molten iron ladle. The pool is desulfurized, and the desulfurization effect is good. However, due to the high price of fluidized lime, it is three times that of fine lime produced by metallurgical enterprises. The price of passivated magnesium is also 4,000 yuan / t higher than that of aluminum cut shot. Therefore, the cost of desulfurization has room to decrease. [0003] At present, the patents of various iron and steel enterprises on the pre-desulfurization of molte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/02C21C1/04C21C7/064C21C7/06
CPCC21C1/02C21C1/04C21C7/0006C21C7/06C21C7/064
Inventor 舒宏富石知机沈昶刘天泉郭俊波张晓峰
Owner MAANSHAN IRON & STEEL CO LTD