Composite desulfuration method for molten iron

A technology of molten iron and desulfurization agent, applied in the field of iron and steel metallurgy, can solve the problem of difference at the beginning, and achieve the effect of small temperature drop, enhanced desulfurization effect and low consumption

Inactive Publication Date: 2006-09-13
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When rotating in one direction, a large vortex rotating in one direction is formed in the center of the molten iron surface. At this time, the amount of desulfurization agent involved in the liquid is proportional to the rotation speed of the agitator, but when the agitation speed reaches a certain value, the desulfurization effect is not good. What is the reason for the increase? Through research, it is found that when rotating in one direction, the desulfurizer particles are rarely involved in the molten iron liquid, but rotate together with the liquid. The speed difference between the two is different at first, and then becomes more The smaller the size, the smaller the collision and mixing effect, most of t

Method used

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  • Composite desulfuration method for molten iron
  • Composite desulfuration method for molten iron
  • Composite desulfuration method for molten iron

Examples

Experimental program
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Example Embodiment

[0032] Example 1-5

[0033] According to the composite desulfurization method of the present invention, a rotary spray gun with a pulse agitator is used to perform composite desulfurization treatment on molten iron by a pulse stirring method and a rotary spray gun injection method.

[0034] Drive the molten iron tank (package) car to the injection desulfurization station (the railway is equipped with positioning device), the system starts to run, the rotating spray gun starts to input the desulfurizer according to the injection system program, and the positive and negative two-way pulse stirring are carried out at the same time. In contrast, one of the furnaces still uses unidirectional rotating stirring for desulfurization. After the five tanks (bags) of molten iron reach the calculated injection volume, the automatic gun will stop stirring and spraying. When the desulfurizing agent is put in from the top of the bag (tank), the molten iron is poured into the measurable hopper.

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Example Embodiment

[0036] Example 6

[0037] In order to verify the correctness, advancement and desulfurization effect of the composite desulfurization method of the pulse stirring method and the rotary spray gun injection method of the present invention, the present invention adopts the method of physical simulation (ie hydraulic model experiment) to compare the unidirectional rotating stirring and the desulfurization effect. A comparison experiment was carried out between the forward and reverse two-way rotating stirring and the rotating-stop-rotating pulsed rotating stirring.

[0038] 1. Test device and method

[0039] Test device such as figure 1 Shown. In the figure, 1 is a variable speed motor, 2 is a flow meter, 3 is a recorder, 4 is NaCl, 5 is a pressure gauge, 6 is a conductivity meter, 7 is a gas source, 8 is a drain pipe, and 9 is a conductivity electrode.

[0040] According to the actual molten iron ladle prototype = 1:4, the model was made, the molten iron was simulated with water, an...

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Abstract

The invention relates to molten iron desulfurization technology. It adopts rotating airbrush tool and pulse type whisking system that the spraying head has blender, while adding the desulfurizer, the blender whisking the molten iron. The whisking method could be negative or positive two-way whisking, or rotate-stop-rotate pulse rotating whisking. Another kind of desulfurizer could be added into molten iron and spraying little nitrogen gas into molten iron. The invention has good desulfurization effect, and the sulfur content could be less than 0.001% after being treated. And it has little temperature drop, less than 1 degree centigrade/min. The consumption of desulfurizer is low, about 0.2-0.5kg/t molten iron. It has good integrated economic effect.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy and relates to a molten iron desulfurization process. Background technique [0002] In the prior art, hot metal desulfurization is a widely used process. With the gradual promotion of molten iron desulfurization technology in my country, various desulfurization technologies have also been adopted one after another. From the desulfurization of iron gutters to desulfurization of torpedo tanks or ladles, desulfurization agents have developed from soda, calcium carbide powder, and lime to pure magnesium. The way of adding the agent has been developed from artificial and launder to spray gun injection, and finally formed two methods: stirring method and injection method. However, small-capacity molten iron ladles (or tanks) are commonly used in small and medium-sized blast furnaces. The above two methods alone cannot meet the requirements of molten iron desulfurization. Slagging before and aft...

Claims

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Application Information

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IPC IPC(8): C21C7/064
Inventor 刘浏吴巍胡砚斌
Owner CENT IRON & STEEL RES INST
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