Step-by-step molten iron KR stirring desulfurization method

A stirring desulfurization, step-by-step technology, applied to chemical instruments and methods, mixers with rotating stirring devices, mixers, etc., can solve problems such as unsatisfactory, loss of blade effect, poor entrainment and dispersion effects, etc. It achieves the effects of reducing blade wear, increasing the floating distance, and improving the reaction kinetics conditions

Inactive Publication Date: 2020-07-10
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, the invention controls the stirring parameters step by step to achieve the purpose of improving the desulfurization effect and reducing the stirring loss

Method used

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  • Step-by-step molten iron KR stirring desulfurization method
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  • Step-by-step molten iron KR stirring desulfurization method

Examples

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Embodiment 1

[0038] combine figure 1 and figure 2 , a step-by-step molten iron KR stirring desulfurization method of the present embodiment, the steps are:

[0039] Step 1. Remove slag from the molten iron until the exposed area of ​​the molten iron surface reaches more than 60%, measure the depth of the liquid surface, record it as H, and measure temperature and sample;

[0040] Step 2. Insert the agitator 1 into the 1 / 4 height of the depth of the molten iron level, that is, the insertion depth of the agitator 1 is h=H / 4, and rotate to the working speed;

[0041] Step 3: Add desulfurizer, keep the insertion depth and working speed of stirrer 1 for 4 minutes;

[0042] In this step, the desulfurizer is blown from the silo to the molten iron tank 2 with nitrogen at a blowing pressure of 0.1 MPa, and the feed silo and the molten iron tank 2 are connected by a feeding pipe 3, which includes an inclined straight pipe section and a curved For the short pipe section, the feeding port is verti...

Embodiment 2

[0050] A kind of step-by-step molten iron KR stirring desulfurization method of the present embodiment, its steps are:

[0051] Step 1. Remove slag from the molten iron until the exposed area of ​​the molten iron surface reaches more than 60%, measure the depth of the liquid surface, record it as H, and measure temperature and sample;

[0052] Step 2. Insert the agitator 1 into the height of 3 / 8 of the depth of the molten iron level, that is, the insertion depth of the agitator 1 is h=3H / 8, and rotate to the working speed;

[0053] Step 3: Add desulfurizing agent, keep the insertion depth and working speed of stirrer 1 for 4 minutes; the injection pressure is 0.12MPa, the particle size of desulfurizing agent is 0.5mm, and its mass percentage components are: CaO: 58%, Al 2 o 3 : 14%, SiO 2 : 4%, MgO: 10%, CaF 2 : 2%, soda ash: 3.5%, K 2 O: 5%, Na 2 O: 3.5%;

[0054] Step 4, adjust the stirring insertion depth and stirring speed, insert the stirrer 1 to 5 / 8 of the depth of...

Embodiment 3

[0057] A kind of step-by-step molten iron KR stirring desulfurization method of the present embodiment, its steps are:

[0058] Step 1. Remove slag from the molten iron until the exposed area of ​​the molten iron surface reaches more than 60%, measure the depth of the liquid surface, record it as H, and measure temperature and sample;

[0059] Step 2. Insert the agitator 1 into the height of 1 / 8 of the depth of the molten iron level, that is, the insertion depth of the agitator 1 is h=H / 8, and rotate to the working speed;

[0060] Step 3: Add desulfurizing agent, keep the insertion depth and working speed of stirrer 1 for 4 minutes; the injection pressure is 0.15MPa, the particle size of desulfurizing agent is 1mm, and its mass percentage components are: CaO: 59%, Al 2 o 3 : 13%, SiO 2 : 3%, MgO: 10.5%, CaF 2 : 2.5%, soda ash: 4%, K 2 O: 4%, Na 2 O: 4%;

[0061] Step 4, adjust the stirring insertion depth and stirring speed, insert the stirrer 1 to 7 / 8 of the depth of th...

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Abstract

The invention discloses a step-by-step molten iron KR stirring desulfurization method, and belongs to the technical field of molten iron external desulfurization before converter steelmaking. The method comprises the following steps of 1, slagging off molten iron, measuring the depth of the liquid level, and measuring the temperature and sampling; 2, inserting a stirrer into the shallow layer of the liquid level of the molten iron, and rotating to a working speed; 3, keeping the stirring depth and the rotating speed, and adding a desulfurizing agent; 4, adjusting the insertion depth and the working rotating speed of the stirrer; and 5, stirring until the desulfurization is finished, and carrying out slagging-off, temperature measurement and sampling again. According to the step-by-step molten iron KR stirring desulfurization method, in the initial stage of stirring, a shallow stirrer insertion depth and a low stirring rotating speed are adopted, entrainment, mixing and dispersion of the desulfurizing agent are facilitated, and energy consumption and blade abrasion can be reduced; and a deep stirring depth is adopted in the later stage of stirring, so that uniform stirring and mixing of a molten pool are facilitated, the upward floating stroke of the desulfurizing agent is increased, the stirring and mixing area of the molten pool is effectively expanded, and the reaction dynamic condition of the bottom area of the molten pool is improved.

Description

technical field [0001] The invention relates to the technical field of external desulfurization of molten iron before converter steelmaking, and more specifically relates to a step-by-step KR stirring desulfurization method for 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 depth of in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/02C21C7/064B01F7/18
CPCC21C1/02C21C7/064B01F27/90
Inventor 李明晖
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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