Method for desulfurizing molten iron

A hot metal desulfurization and hot metal technology, applied in the field of steelmaking, can solve the problems of large desulfurization agent consumption and unsatisfactory desulfurization effect, and achieve the effects of reducing the temperature loss of molten iron, improving kinetic conditions, and small temperature loss

Inactive Publication Date: 2015-04-08
SHOUGANG SHUICHENG IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide a method for desulfurization of molten iron with good desulfurization effect and simple operation, so as to solve the shortcomings of the prior art that the unit consumption of desulfurizer is relatively large and the desulfurization effect is not ideal.

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  • Method for desulfurizing molten iron
  • Method for desulfurizing molten iron
  • Method for desulfurizing molten iron

Examples

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Effect test

Embodiment 1

[0026] A method for desulfurizing molten iron, comprising the steps of:

[0027] (1) When tapping the blast furnace, add active lime to the molten iron tank. The weight of each tank of molten iron is 90t, and the amount of active lime added is 2.8kg / t molten iron, so that the molten iron and lime powder are mixed to improve the desulfurization kinetics , to achieve the purpose of sufficient desulfurization, the mass percentage of CaO in the active lime is 88%, and the activity is 302ml;

[0028] (2) After the molten iron arrives at the steelmaking plant, use a wire feeder to feed Ca wire into the molten iron for desulfurization. The feeding amount of Ca is 0.4Kg / t molten iron. The desulfurization by wire feeding method avoids the loss of desulfurizer, and the Ca Strong desulfurization ability, compared with other desulfurizers, the temperature loss of molten iron is small;

[0029] (3) After the desulfurization treatment of molten iron, remove the desulfurization slag with a ...

Embodiment 2

[0031] A method for desulfurizing molten iron, comprising the steps of:

[0032] (1) When tapping the blast furnace, add active lime to the molten iron tank. The weight of each tank of molten iron is 92t, and the amount of active lime added is 3.2kg / t molten iron, so that the molten iron and lime powder are mixed to improve the kinetic conditions of desulfurization , to achieve the purpose of sufficient desulfurization, the mass percentage of CaO in the active lime is 92%, and the activity is 318ml;

[0033] (2) After the molten iron arrives at the steelmaking plant, use a wire feeder to feed Ca wire into the molten iron for desulfurization. The feeding amount of Ca is 0.45Kg / t molten iron. The desulfurization by wire feeding method avoids the loss of desulfurizer, and the Ca Strong desulfurization ability, compared with other desulfurizers, the temperature loss of molten iron is small;

[0034] (3) After the desulfurization treatment of molten iron, remove the desulfurizatio...

Embodiment 3

[0036] A method for desulfurizing molten iron, comprising the steps of:

[0037] (1) When tapping the blast furnace, add active lime to the molten iron tank. The weight of each tank of molten iron is 94t, and the amount of active lime added is 3kg / t molten iron, so that the molten iron and lime powder are mixed to improve the desulfurization kinetics conditions. To achieve the purpose of sufficient desulfurization, the mass percentage of CaO in the active lime is 90%, and the activity is 310ml;

[0038] (2) After the molten iron arrives at the steelmaking plant, the Ca wire is fed into the molten iron by a wire feeder for desulfurization. The feeding amount of Ca is 0.43Kg / t of molten iron. The desulfurization by wire feeding method avoids the loss of desulfurizer, and the Ca Strong desulfurization ability, compared with other desulfurizers, the temperature loss of molten iron is small;

[0039] (3) After the desulfurization treatment of molten iron, remove the desulfurizatio...

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Abstract

The invention discloses a method for desulfurizing molten iron, and belongs to the technical field of steelmaking. The method comprises the following steps: when discharging iron from a blast furnace, adding active lime into a molten iron tank, feeding a Ca wire into the molten iron by using a wire feeding machine for desulfurizing after the molten iron arrives at a steel mill, fishing out the desulfurizing residues by using a slag removing rake, and then adding a heat insulation agent into the molten iron. The method for desulfurizing molten iron disclosed by the invention needs less time and can be used for effectively reducing the loss of molten iron temperature in the desulfurizing process, the method of feeding the Ca wire to desulfurize the molten iron is adopted to effectively ensure the full reaction of Ca, so that the desulfurizing effect is good, the application amount of a desulfurizing agent is small and the desulfurizing cost is low.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a method for desulfurizing molten iron. Background technique [0002] With the needs of social development and economic construction, users have higher and higher requirements for steel quality. In the production process of steel, sulfur is the key element that determines the quality of continuous casting slabs. Hot metal desulfurization is currently the most reliable technical guarantee for the realization of new processes of full continuous casting, near-net shape continuous casting, continuous casting and rolling, and hot charging and hot delivery. In the face of increasingly fierce competition in the steel market, the economical and efficient hot metal pretreatment desulfurization technology, as one of the important links in the typical optimized process flow of the modern steel industry, has been widely used in actual production and has become an important pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C1/02
Inventor 刘欣敖万忠聂礼郎黔
Owner SHOUGANG SHUICHENG IRON & STEEL GRP
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