Discharging device for reducing consumption of KR desulfurizing agent and desulfurization process

Abstract

The invention discloses a discharging device for reducing consumption of a KR desulfurizing agent and a desulfurization process, relates to the technical field of iron and steel smelting, and solves the problems that the discharging device is easy to cause waste of the desulfurizing agent, high in desulfurization consumption and low in desulfurization efficiency. The device comprises a discharging pipe, a connecting part arranged at the feeding end of the discharging pipe and an arc-shaped bent pipe communicated with the discharging end of the discharging pipe in a welded mode, and the bending angle of the arc-shaped bent pipe ranges from 50 degrees to 65 degrees. The invention also provides a desulfurization process which comprises the following steps: filling molten iron into a container, and controlling the molten iron filling amount at a first preset parameter; setting the depth of the stirring head in the molten iron liquid level; starting a stirrer for stirring; a KR desulfurizing agent is taken and introduced into a discharging device, the discharging speed and the rotating speed of a stirring head during discharging are controlled, and the KR desulfurizing agent is introduced into the container at a time through the feeding end of the discharging device; kR desulfurization is started, and desulfurization is finished after a certain time.

Description

Technical Field

[0001] The invention relates to the technical field of steel smelting, and in particular to a feeding device for reducing the consumption of a KR desulfurizer and a desulfurization process. Background Art

[0002] In the KR desulfurization of steel smelting, if the particle size of the KR desulfurizer is fine, the particle size below 0.5mm accounts for 83.56%. When the desulfurizer passes through the movable chute discharge pipe of the discharge device, the existing movable chute discharge pipe has a flat and unobstructed discharge port, which makes the desulfurizer easily sucked away by dust removal during the discharge process and the discharge point is too close to the edge of the molten iron. First, it causes waste of desulfurizer and high desulfurization consumption. Second, when the discharge pipe is extended and retracted, it will cause friction on the edge of the molten iron ladle. The discharge position is at the edge of the molten iron, which is not conducive to the stirring and integration of the desulfurizer into the molten iron, resulting in low desulfurization efficiency. It can be seen that the existing discharge device has obvious defects. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that a feeding device easily causes waste of desulfurizer, high desulfurization consumption and low desulfurization efficiency. The present invention provides a feeding device and a desulfurization process for reducing KR desulfurizer consumption.

[0004] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0005] On the one hand, the present invention provides a feeding device for reducing the consumption of KR desulfurizer, the device comprising a feeding pipe, a connecting portion arranged at the feeding end of the feeding pipe, and an arc-shaped elbow welded and connected to the discharging end of the feeding pipe, wherein the bending angle of the arc-shaped elbow is 50 to 65°.

[0006] Furthermore, the feed pipe and the arc-shaped curved pipe are hollow steel pipes.

[0007] Furthermore, a detachable cover is provided at the discharge end of the arc-shaped curved pipe.

[0008] On the other hand, the present invention also provides a desulfurization process of the above-mentioned feeding device for reducing the consumption of KR desulfurizer, comprising the following steps:

[0009] S1, take molten iron and put it into the container, and control the amount of molten iron to be loaded to the first preset parameter;

[0010] S2, set the depth of the stirring head into the molten iron liquid surface;

[0011] S3, turning on the agitator to stir;

[0012] S4, take KR desulfurizer and introduce it into the feeding device, and control the feeding speed and the speed of the stirring head during feeding, and introduce the KR desulfurizer into the container at one time through the feeding end of the feeding device;

[0013] S5. After the material is unloaded, the speed of the stirring head is further increased. After a certain period of time, the desulfurization is completed.

[0014] Furthermore, in S1, the first preset parameter is 79-81t.

[0015] Furthermore, in S1, the KR desulfurizer has a CaO content of ≥80%, S% ≤0.150%, CaF2% ≥6%, and a particle size of 1-1.5 mm, calculated by mass percentage.

[0016] Furthermore, in S2, the depth of the stirring head into the molten iron liquid surface is 600 mm.

[0017] Furthermore, the specific operation of S3 is to start the agitator and rotate it slowly for 30 seconds. When the stirring speed reaches 60r / min, a vortex is formed on the surface of the molten iron and enter S4.

[0018] Furthermore, in S4, the KR desulfurizer has a CaO content of ≥80%, S% ≤0.150%, and CaF2% ≥6% by mass.

[0019] Furthermore, in S4, the particle size of the KR desulfurizer is 1-1.5 mm.

[0020] Furthermore, in S4, the rotation speed of the stirring head during feeding is ≥80r / min.

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] 1. The present invention relates to a feeding device for reducing the consumption of KR desulfurizer. By optimizing the shape of the discharge end of the lower part of the feeding pipe, a 50-65° arc elbow and a cover are added to the discharge end of the feeding pipe, so that the discharge point of the desulfurizer is close to the center of the molten iron ladle. The desulfurizer can enter the molten iron for reaction more effectively through stirring, and at the same time, the friction with the molten iron ladle and damage to the feeding pipe when the feeding pipe moves downward is solved; the addition of a cover at the outlet of the feeding pipe can prevent the desulfurizer from being too fine and affected by dust removal, and being sucked away by dust removal. After current use, the unit consumption of KR desulfurizer has decreased by 16.9%, and the consumption of KR desulfurizer per ton of iron has decreased by 10.42%. A large amount of dust removal ash is reduced every day, and the desulfurization consumption is high and the desulfurization efficiency is high. The problem that the feeding device easily causes waste of desulfurizer, high desulfurization consumption and low desulfurization efficiency is solved.

[0023] 2. The desulfurization process involved in the present invention has a wide range of applications, is universal and has high superiority. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The present invention is a schematic structural diagram of a feeding device for reducing the consumption of KR desulfurizer.

[0025] The attached drawings are marked with: 1-feeding pipe, 2-arc elbow, 3-connecting part.

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] Therefore, the detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0028] All other obtained embodiments belong to the protection scope of the present invention. DETAILED DESCRIPTION

[0029] First, the present invention provides a feeding device for reducing the consumption of KR desulfurizer. Figure 1 The device comprises a feed pipe 1, a connecting portion 3 provided at the feed end of the feed pipe 1, and an arc-shaped curved pipe 2 welded and connected to the discharge end of the feed pipe 1, wherein the bending angle of the arc-shaped curved pipe 2 is 50-65°, and the bending angle is preferably 60°.

[0030] It is understandable that by optimizing the shape of the discharge end of the lower part of the feed pipe 1, adding a 50-65° arc elbow 2 and a cover at the discharge end of the feed pipe 1, the discharge point of the desulfurizer is close to the center of the molten iron ladle, and the desulfurizer can enter the molten iron more effectively through stirring to react. At the same time, the friction of the feed pipe 1 on the molten iron ladle and damage to the feed pipe 1 when the feed pipe 1 moves downward is solved; the addition of the outlet cover of the feed pipe 1 can prevent the desulfurizer from being too fine and affected by dust removal and being sucked away by dust removal. After current use, the unit consumption of KR desulfurizer has decreased by 16.9%, and the consumption of KR desulfurizer per ton of iron has decreased by 10.42%. A large amount of dust removal ash is reduced every day, and the desulfurization consumption is high and the desulfurization efficiency is high. The problem that the feed device is prone to waste of desulfurizer, high desulfurization consumption and low desulfurization efficiency is solved.

[0031] In certain embodiments of the present invention, the feed pipe 1 and the arc-shaped curved pipe 2 are steel hollow pipes. The arc-shaped circular pipe is made of steel pipe and is a hollow pipe, which can effectively achieve desulfurization.

[0032] In some embodiments of the present invention, a detachable cover is provided at the discharge end of the arc-shaped elbow 2. The addition of the cover can prevent the desulfurizing agent from being too fine and being affected by the dust removal and being sucked away by the dust removal.

[0033] On the other hand, the present invention also provides a desulfurization process of the above-mentioned feeding device for reducing the consumption of KR desulfurizer, comprising the following steps:

[0034] S1, take molten iron and put it into the container, and control the amount of molten iron to be loaded to the first preset parameter;

[0035] S2, set the depth of the stirring head into the molten iron liquid surface;

[0036] S3, turning on the agitator to stir;

[0037] S4, take KR desulfurizer and introduce it into the feeding device, and control the feeding speed and the speed of the stirring head during feeding, and introduce the KR desulfurizer into the container at one time through the feeding end of the feeding device;

[0038] S5. After the material is unloaded, the speed of the stirring head is further increased. After a certain period of time, the desulfurization is completed.

[0039] In some embodiments of the present invention, in S1, the first preset parameter is 79-81t.

[0040] The present invention can effectively improve the desulfurization rhythm of high-sulfur molten iron and effectively reduce the molten iron consumed in desulfurization by adjusting various parameters of KR desulfurization and improving the desulfurizer used in the desulfurization process, thereby reducing the production cost of the enterprise, achieving good desulfurization effect, high efficiency and less molten iron consumption.

[0041] The present invention also optimizes the operation and parameters of KR. Controlling the amount of KR desulfurizer added can avoid adding the desulfurizer too early, that is, when the vortex is not formed, the desulfurizer cannot be fully dispersed into the molten iron with the vortex, and part of the desulfurizer sticks to the shaft of the stirring head, generating a "mushroom" phenomenon, which makes the desulfurization effect poor. If added too late, splashing is easy to occur during high-speed stirring, and the utilization rate of the desulfurizer is reduced. Since the particle size of the KR desulfurizer is optimized in the present invention, the particle size is fine, and the one-time feeding amount is controlled to be controlled at 500-600kg. After the desulfurizer is added, the rotation speed is appropriately increased according to the condition of the stirring head. If there is a phenomenon of surface caking or poor melting of the desulfurizer, the height of the stirring head can be increased, and the desulfurizer is stirred from the upper layer and then the stirring head is lowered to ensure uniform stirring in the bag. In addition, the rotation speed of the stirring head is optimized to achieve a better desulfurization effect.

[0042] In some embodiments of the present invention, in S1, the first preset parameter is 79-81t.

[0043] In certain embodiments of the present invention, in S1, the KR desulfurizer has a CaO content of ≥80%, S% ≤0.150%, and CaF2% ≥6% by mass. The particle size of the KR desulfurizer is 1-1.5 mm. By optimizing the composition and particle size of the KR desulfurizer, a better desulfurization effect can be achieved.

[0044] In certain embodiments of the present invention, in S2, the depth of the stirring head submerged into the molten iron liquid surface is 600 mm.

[0045] In certain embodiments of the present invention, the specific operation of S3 is to start the agitator and rotate it slowly for 30 seconds. When the stirring speed reaches 60r / min, a vortex is formed on the surface of the molten iron, and then enter S4.

[0046] In certain embodiments of the present invention, the specific operation of S3 is to start the agitator and rotate it slowly for 30 seconds. When the stirring speed reaches 60r / min or above, a vortex is formed on the surface of the molten iron, and enter S4, take the KR desulfurizer and introduce it into the feeding device, and control the feeding speed and the speed of the stirring head during feeding, and add the KR desulfurizer into the desulfurizer at one time through the feeding end of the feeding device.

[0047] If the insertion is too deep, there will be no vortex part and the desulfurizer cannot be fully diffused into the molten iron, so the desulfurization effect is not very good. If the insertion is too shallow, the molten iron will splash severely and no vortex will be generated, so the desulfurization effect is not very good.

[0048] In certain embodiments of the present invention, in step S5, the stirring head speed of the KR desulfurization is 80-120 r / min. By optimizing the stirring head speed of the KR desulfurization in step S5, the desulfurization effect can be optimized.

[0049] Example 1

[0050] A certain enterprise uses a commercially available model RYX-LTTG-2013M8-6 movable chute discharge pipe in smelting. Since the company currently uses KR desulfurizer with finer particle size, 83.56% of which is below 0.5mm, and the discharge port of the original model is flat and unobstructed, the desulfurizer is easily sucked away by dust during the discharge process and the discharge point is too close to the edge of the molten iron. First, it causes waste of desulfurizer and high desulfurization consumption. Second, when the discharge pipe is extended or retracted, it will cause friction on the edge of the molten iron ladle. The discharge position is at the edge of the molten iron, which is not conducive to the stirring and integration of the desulfurizer into the molten iron.

[0051] The structure of the feeding device is optimized, and the outlet of the discharge pipe is transformed into a 60° arc elbow and a cover, so that the discharge point of the desulfurizer is close to the center of the molten iron ladle. The desulfurizer can enter the molten iron more effectively through stirring, and at the same time, the friction with the molten iron ladle and damage to the feeding pipe when the feeding pipe moves downward is solved; the addition of a cover at the outlet of the feeding pipe can prevent the desulfurizer from being too fine and affected by dust removal and being sucked away by dust removal. After using it, the unit consumption of KR desulfurizer has decreased by 16.9%, and the consumption of KR desulfurizer per ton of iron is 14.7kg / t, which is a decrease of 10.42% compared with February, and the dust removal ash is reduced by about 5t per day.

[0052] Example 2

[0053] Based on the feeding device of Example 1, the following desulfurization process is adopted, including the following steps:

[0054] S1, take molten iron and put it into the container, and control the amount of molten iron to be loaded to the first preset parameter;

[0055] S2, set the depth of the stirring head into the molten iron liquid surface;

[0056] S3, turning on the agitator to stir;

[0057] S4, take KR desulfurizer and introduce it into the feeding device, and control the feeding speed and the speed of the stirring head during feeding, and introduce the KR desulfurizer into the container at one time through the feeding end of the feeding device;

[0058] S5. After the material is unloaded, the speed of the stirring head is further increased. After a certain period of time, the desulfurization is completed.

[0059] Based on Example 1, the method of adding the desulfurizer is optimized. See the following table:

[0060]

[0061] In addition, in the slagging step, the slagging step is limited.

[0062] 1) Control the distance between the molten iron slag liquid level in the ladle and the ladle opening, about 50mm.

[0063] 2) Pause for 3-5 seconds when scraping slag to the mouth wall to separate slag and iron

[0064] 3) The molten iron in the ladle shall not flow out of the ladle in strands;

[0065] 4) The slag must be scraped cleanly until the molten iron is exposed. The amount of slag removed must be greater than 85% of the total slag, and there must be no fist-sized lumps of slag.

[0066] The above embodiment is only one implementation of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A feeding device for reducing the consumption of KR desulfurizer, characterized in that: The device comprises a feed pipe, a connecting portion arranged at the feed end of the feed pipe, and an arc-shaped bent pipe welded and connected to the discharge end of the feed pipe, wherein the bending angle of the arc-shaped bent pipe is 50-65 degrees.

2. A feeding device for reducing KR desulfurization agent consumption according to claim 1, characterized in that: The feed pipe and the arc-shaped curved pipe are hollow steel pipes.

3. A feeding device for reducing KR desulfurization agent consumption according to claim 1, characterized in that: The discharge end of the arc-shaped curved pipe is provided with a detachable cover.

4. A desulfurization process based on a feeding device for reducing KR desulfurizer consumption according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1, take molten iron and put it into the container, and control the amount of molten iron to be loaded to the first preset parameter; S2, set the depth of the stirring head into the molten iron liquid surface; S3, turning on the agitator to stir; S4, take KR desulfurizer and introduce it into the feeding device, and control the feeding speed and the speed of the stirring head during feeding, and introduce the KR desulfurizer into the container at one time through the feeding end of the feeding device; S5. After the material is unloaded, the speed of the stirring head is further increased. After a certain period of time, the desulfurization is completed.

5. A desulfurization process according to claim 4, characterized in that: In S1, the first preset parameter is 79-81t.

6. A desulfurization process according to claim 4, characterized in that: In S2, the depth of the stirring head into the molten iron liquid surface is 600 mm.

7. A desulfurization process according to claim 4, characterized in that: The specific operation of S3 is to start the stirrer and rotate it slowly for 30 seconds. When the stirring speed reaches 60r / min, a vortex is formed on the surface of the molten iron and enter S4.

8. A desulfurization process according to claim 4, characterized in that: In the S4, the KR desulfurizer has a CaO content of ≥80%, an S% of ≤0.150%, and a CaF2% of ≥6% by mass.

9. A desulfurization process according to claim 4, characterized in that: In S4, the particle size of the KR desulfurizer is 1-1.5 mm.

10. A desulfurization process according to claim 4, characterized in that: In S4, the stirring head rotation speed is ≥80r / min during feeding.

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