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A mechanical stirring desulfurization method for molten iron based on bottom blowing powder

A technology of mechanical stirring and molten iron, applied in the field of desulfurization of molten iron before converter steelmaking, can solve the problems of poor entrainment and dispersion effect, unsatisfactory, loss of blade effect, etc., to prolong the entrainment cycle stroke and promote turbulent flow , Contain the effect of concentric rotation

Active Publication Date: 2021-11-26
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the problems of poor entrainment and dispersion effect of desulfurizer in molten iron in the existing KR stirring method, and the improved method wears the blades of the stirrer and the effect is still unsatisfactory, and provides a step-by-step molten iron KR stirring desulfurization method, injecting desulfurizing agent from a specific position at the bottom and controlling nitrogen injection to achieve the purpose of improving the desulfurization effect

Method used

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  • A mechanical stirring desulfurization method for molten iron based on bottom blowing powder
  • A mechanical stirring desulfurization method for molten iron based on bottom blowing powder

Examples

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Effect test

Embodiment 1

[0037] A kind of mechanical stirring desulfurization method of molten iron based on bottom blowing powder of the present embodiment, its steps are:

[0038] Step 1. Slagging off the molten iron until the exposed area of ​​the molten iron surface reaches more than 60%, measuring the depth of the liquid surface, and measuring temperature and sampling.

[0039] Step 2. Insert the agitator 1 into the molten iron. The insertion depth of the agitator 1 is 30% higher than that in the conventional KR method, and start to rotate. The agitator 1 is an agitator with a conventional blade structure.

[0040] Step 3. After the speed of the agitator 1 is increased to the working speed, spray the desulfurizer into the molten iron from the bottom of the molten iron tank 2:

[0041] Specifically, install a slit-type powder-spraying ventilation brick 3 at the bottom of the molten iron tank 2, and the distance between the installation position of the ventilation brick 3 and the center of the bott...

Embodiment 2

[0050] A kind of mechanical stirring desulfurization method of molten iron based on bottom blowing powder of the present embodiment, its steps are:

[0051] Step 1. Remove slag from the molten iron until the exposed area of ​​the liquid surface of the molten iron reaches more than 60%, measure the depth of the liquid surface, and perform temperature measurement and sampling;

[0052] Step 2. Insert the agitator 1 into the molten iron. The insertion depth of the agitator 1 is 10% higher than that in the conventional KR method, and start to rotate, wherein the agitator 1 is an agitator with a conventional blade structure;

[0053] Step 3: After the rotating speed is increased to the working speed, the desulfurizer is sprayed into the molten iron from the bottom of the molten iron tank 2; wherein, the breathable brick 3 is installed at the center of the tank bottom, and the mass percentage components of the desulfurizer are: CaO: 58%, Al 2 o 3 : 14%, SiO 2 : 4%, MgO: 10%, CaF ...

Embodiment 3

[0057] A kind of mechanical stirring desulfurization method of molten iron based on bottom blowing powder of the present embodiment, its steps are:

[0058] Step 1. Remove slag from the molten iron until the exposed area of ​​the liquid surface of the molten iron reaches more than 60%, measure the depth of the liquid surface, and perform temperature measurement and sampling;

[0059] Step 2. Insert the agitator 1 into the molten iron. The insertion depth of the agitator 1 is 20% higher than that in the conventional KR method, and start to rotate, wherein the agitator 1 is an agitator with a conventional blade structure;

[0060] Step 3: After the rotating speed is increased to the working rotating speed, the desulfurizing agent is sprayed into the molten iron from the bottom of the molten iron tank 2; wherein, the breathable brick 3 is installed in the center of the tank bottom, and the mass percentage components of the desulfurizing agent are: CaO: 59%, Al 2 o 3 : 13%, SiO ...

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Abstract

The invention discloses a mechanical stirring desulfurization method for molten iron based on bottom blowing powder, and belongs to the technical field of external desulfurization of molten iron before converter steelmaking. The steps of the present invention are as follows: Step 1, removing slag from the molten iron, measuring the depth of the liquid surface, and measuring temperature and sampling; Step 2, inserting the agitator into the molten iron, which is deeper than the conventional KR method, and starting to rotate; step 3. After the speed is increased to the working speed, spray the desulfurizer into the molten iron from the bottom of the molten iron tank; step 4, after the desulfurizer is sprayed to the specified value, stop spraying the desulfurizer and change to blowing nitrogen; step 5, spray nitrogen Stir until the desulfurization is completed, then carry out slag removal, temperature measurement and sampling again. In the present invention, air-permeable bricks are arranged at a specific position at the bottom of the molten iron tank, and the desulfurizing agent is sprayed into the molten iron tank from then on, so that the particle size of the desulfurizing agent can be smaller, and the thermodynamic conditions of desulfurization reaction are improved; and the insertion depth of the agitator can be deeper, which increases desulfurization The floating range of the agent expands the mixing and dispersing area of ​​the molten pool.

Description

technical field [0001] The invention relates to the technical field of external desulfurization of molten iron before converter steelmaking, in particular to a mechanical stirring desulfurization method for desulfurization pretreatment of molten iron. Background technique [0002] Mechanical agitation desulfurization of molten iron is through the rotation and agitation of the agitator inserted into the molten iron in the molten iron tank, so that the molten iron and desulfurizer are mixed and contacted for desulfurization. There are mainly Rhine method and KR (Kambara Reactor) method. The agitators used in these two methods of mechanical stirring desulfurization of molten iron are composed of a rotating shaft and stirring blades. The four stirring blades are evenly arranged in a cross shape along the circumference of the rotating shaft, and the agitator is inserted into the molten iron along the center line of the molten iron tank; the difference is only in the agitator The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064C21C1/02
CPCC21C1/025C21C7/0645
Inventor 李明晖
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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