Method for tapping through skimmer by online switching of iron storage type main channel

Abstract

The invention discloses a method for on-line switching of an iron storage type main channel to pass through a skimmer for tapping, and relates to the technical field of ferrous metallurgy. Comprising the following steps that a steel plate is used for manufacturing a temporary slag stopping iron flashboard, the temporary slag stopping iron flashboard is obliquely placed in a large well area in front of an iron storage type main runner skimmer at 60 DEG C, the space between the temporary slag stopping iron flashboard and the ground of the large well area is filled, a temporary slag and iron discharging runner is formed in an iron storage type main runner, and under the working condition that slag and iron are discharged through the skimmer, slag and iron are discharged through the skimmer; the method comprises the following steps: a blast furnace adopts a temporary slag and iron discharge runner to discharge slag and iron, after the blast furnace adopts the temporary slag and iron discharge runner to discharge the slag and iron and reaches a working condition of using a slag skimmer to discharge the slag and iron, a crane is adopted to hoist a temporary slag and iron stopping flashboard, and the slag and iron flow through the slag skimmer to complete slag and iron separation and continuously discharge the slag and iron; by means of the method, it can be guaranteed that the slag skimmer needs to be switched to discharge slag iron continuously when the blast furnace is started to discharge slag iron, the slag iron can be effectively and completely discharged in time, and the problems that in a traditional method, slag iron discharging is not in time, and the labor input cost is high are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of iron and steel metallurgy, and in particular to a method for online switching of an iron storage type main ditch to discharge iron through a slag skimmer. Background Art

[0002] When the blast furnace is opened or resumed after a long period of shutdown, the amount of slag is large in the early stage, the heat of slag iron is insufficient, the fluidity is poor, and the separation of slag iron is difficult. In the early stage, the slag iron is discharged by the slag skimmer to the red slag pit. When this type of slag iron is discharged in the iron storage main ditch, the main ditch is generally filled with coke powder to make a temporary slag iron discharge ditch (such as Figure 1 When the slag skimmer is sufficient for tapping, the taphole is switched to the slag skimmer for tapping. After the slag and iron are tapped out of the main ditch of the taphole, the residual slag and iron in the main ditch must be cleaned and filled with coke powder before tapping again.

[0003] The above method has the following disadvantages: 1. Switching the tapping nozzle through the slag skimmer requires reversing the tapping nozzle, which affects the timely discharge of slag iron. 2. It is labor-intensive. After switching the tapping nozzle, a large amount of manpower is still required to clean the slag iron and the coke powder filled in the tapping nozzle. 3. The slag iron cannot be separated and discharged in time, resulting in a large amount of residual iron discharged in the red slag pool, affecting subsequent cleaning and wasting resource costs. Therefore, the present invention proposes a method for switching the iron storage type main ditch online through the slag skimmer to discharge iron, so as to address the shortcomings of the existing technology. Summary of the Invention

[0004] In view of the above problems, the purpose of the present invention is to provide a method for online switching of the iron storage type main ditch through the slag skimmer to discharge iron. The slag iron needs to be switched through the slag skimmer to discharge the slag iron without interruption when the blast furnace is opened, and the slag iron can be discharged in time and effectively, solving the problems of untimely slag iron discharge and high labor input cost in traditional methods.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for tapping iron by switching an iron storage type main ditch online through a slag skimmer comprises the following steps:

[0007] Step 1: Before the blast furnace is started or resumed after a long-term shutdown, a temporary slag-blocking iron gate is made of steel plates;

[0008] Step 2: Install the prepared temporary slag blocking iron gate in the large well area in front of the iron storage type main ditch skimmer. During installation, the temporary slag blocking gate is placed at a 60° angle in the large well area in front of the iron storage type main ditch skimmer.

[0009] Step 3: Fill the space between the temporary slag blocking iron gate and the ground in the large well area in front of the iron storage type main ditch skimmer to ensure that the contact surface is tight;

[0010] Step 4: Fill the iron storage main ditch with coke powder to form a temporary slag and iron discharge ditch;

[0011] Step 5: In the absence of a slag skimmer to discharge slag iron, the blast furnace uses a temporary slag iron ditch to discharge slag iron;

[0012] Step 6: After the blast furnace uses a temporary slag discharge ditch to discharge slag iron and reaches the working condition of using a slag skimmer to discharge slag iron, a crane is used to lift the temporary slag iron gate, and the slag iron flows through the slag skimmer to complete the slag iron separation and continue to discharge slag iron.

[0013] A further improvement is that when the temporary slag blocking iron gate is made in step one, the shape of the temporary slag blocking iron gate is adapted to the cross-sectional shape of the large well area in front of the iron storage type main ditch skimmer.

[0014] A further improvement is that when the temporary slag-blocking iron gate is made in step one, the temporary slag-blocking iron gate is also provided with a lifting lug adapted to the lifting hook on the crane.

[0015] A further improvement is that when the temporary slag blocking gate in step 2 is placed at a 60° tilt in the large well area in front of the iron storage type main ditch skimmer, it is also necessary to control the side of the temporary slag blocking iron gate containing the castable to face the taphole.

[0016] Further improvements are as follows: the specific operation of filling the space between the temporary slag-blocking iron gate and the ground of the large well area in front of the iron storage type main ditch skimmer in step three includes: filling the space between the temporary slag-blocking iron gate and the ground of the large well area in front of the iron storage type main ditch skimmer with ditch material or refractory mud, and it is necessary to ensure that the ditch material or refractory mud is filled evenly during the filling.

[0017] A further improvement is that in step three, the ditch material or refractory mud is dried after filling. The temperature of the ditch material or refractory mud needs to be slowly increased during drying, and the temperature distribution in the baking area needs to be controlled to be uniform to avoid local overheating or overcooling.

[0018] A further improvement is that after the ditch material or refractory mud is dried in step three, coke powder needs to be filled on one side of the temporary slag blocking iron gate on one side of the iron mouth.

[0019] A further improvement is that in step 4, before the iron storage main ditch is filled with coke powder, a fixed block or support structure is added to a key position of the temporary slag iron discharge ditch in the iron storage main ditch to improve the stability of the temporary slag iron discharge ditch.

[0020] A further improvement is that when the iron storage type main trench is filled with coke powder in step four, it is first necessary to clean up the debris, residual iron and accumulated slag in the iron storage type main trench to ensure that the trench is clean and unobstructed, and then select coke powder with uniform particle size and high quality for filling to ensure that the coke powder has good air permeability and support.

[0021] A further improvement is that when the iron storage main trench is filled with coke powder in step 4, the coke powder is filled in layers, and a layer of coke powder is immediately compacted after being filled to ensure that the coke powder is tightly filled without gaps.

[0022] The beneficial effects of the present invention are as follows: the present invention uses steel plates to make temporary slag-blocking iron gate plates and places the temporary slag-blocking iron gate plates at an angle of 60° in the large well area in front of the iron storage type main ditch skimmer. When the blast furnace does not have the working conditions for discharging slag iron through the slag skimmer, the blast furnace adopts a temporary slag iron discharge ditch to discharge slag iron. After the blast furnace adopts the temporary slag iron discharge ditch to discharge slag iron and reaches the working conditions for using a slag skimmer to discharge slag iron, a crane is used to lift the temporary slag iron gate plates, and the slag iron flows through the slag skimmer to complete the slag iron separation and continuously discharge the slag iron. When the blast furnace is opened to discharge slag iron, the slag iron needs to be switched to the slag skimmer for uninterrupted slag iron discharge, and the slag iron can be discharged in time and effectively, solving the problems of untimely slag iron discharge and high labor input cost in the traditional method. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a prior art iron tapping method in the background art;

[0024] Figure 2 Schematic diagram of the process of the present invention

[0025] Figure 3 Schematic diagram of the iron tapping method of the present invention;

[0026] Figure 4 This is a structural schematic diagram of the temporary slag retaining iron gate of the present invention. DETAILED DESCRIPTION

[0027] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the examples. The examples are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0028] Example 1

[0029] according to Figure 2-4 As shown, this embodiment proposes a method for online switching of an iron storage type main ditch through a slag skimmer to tap iron, comprising the following steps:

[0030] Step 1: Before the blast furnace is started or resumed after a long-term shutdown, a temporary slag-blocking iron gate is made of steel plates;

[0031] Step 2: Install the prepared temporary slag blocking iron gate in the large well area in front of the iron storage type main ditch skimmer. During installation, the temporary slag blocking gate is placed at a 60° angle in the large well area in front of the iron storage type main ditch skimmer.

[0032] Step 3: Fill the space between the temporary slag blocking iron gate and the ground in the large well area in front of the iron storage type main ditch skimmer to ensure that the contact surface is tight;

[0033] Step 4: Fill the iron storage main ditch with coke powder to form a temporary slag and iron discharge ditch;

[0034] Step 5: In the absence of a slag skimmer to discharge slag iron, the blast furnace uses a temporary slag iron ditch to discharge slag iron;

[0035] Step 6: After the blast furnace uses a temporary slag discharge ditch to discharge slag iron and reaches the working condition of using a slag skimmer to discharge slag iron, use a crane to lift the temporary slag blocking iron gate.

[0036] A temporary slag discharge ditch is used for the front-stage slag discharge operation, and the slag skimmer is switched when the working conditions for slag skimmer discharge are met. The slag skimmer is used for the rear-stage slag discharge, so that the slag discharge when the blast furnace is opened can be uninterrupted when the slag skimmer is switched to discharge the slag, and the slag can be discharged in time and effectively, solving the problems of untimely slag discharge and high labor input cost in the traditional method, and reducing the amount of slag in the temporary slag discharge ditch, thereby reducing the manpower consumption required for slag cleaning in the later stage.

[0037] Example 2

[0038] according to Figure 2-4 As shown, this embodiment proposes a method for online switching of an iron storage type main ditch through a slag skimmer to tap iron, comprising the following steps:

[0039] A temporary slag blocking iron gate is made of steel plates, the shape of which is adapted to the cross-sectional shape of the large well area in front of the iron storage type main ditch skimmer, and a lifting lug adapted to the hook on the crane is provided on the temporary slag blocking iron gate. By making a temporary slag blocking iron gate adapted to the cross-sectional shape of the large well area in front of the iron storage type main ditch skimmer, it is possible to fully intercept slag in the large well area in front of the iron storage type main ditch skimmer, so that the slag can be discharged through the temporary slag ditch in the early stage.

[0040] The prepared temporary slag blocking iron gate is installed in the large well area in front of the iron storage type main ditch skimmer. During installation, the temporary slag blocking iron gate is placed in the large well area in front of the iron storage type main ditch skimmer at a 60° angle, with the castable side of the temporary slag blocking iron gate facing the taphole. The temporary slag blocking iron gate placed in the large well area in front of the iron storage type main ditch skimmer at a 60° angle not only blocks the slag iron, but also facilitates the rapid removal of the temporary slag blocking iron gate when switching to the skimmer for slag iron discharge later, allowing the slag iron to enter the skimmer.

[0041] Fill the space between the temporary slag-blocking iron gate and the ground of the large well area in front of the iron storage type main ditch skimmer with ditch material or refractory mud. When filling the ditch material or refractory mud, it is necessary to ensure that the ditch material or refractory mud is filled evenly. After the ditch material or refractory mud is filled, it is dried. The temperature of the ditch material or refractory mud needs to be slowly increased when drying, and the temperature distribution in the baking area needs to be controlled to be uniform to avoid local overheating or overcooling. After the ditch material or refractory mud is dried, it is also necessary to fill coke powder on one side of the temporary slag-blocking iron gate on the iron mouth side. By filling coke powder on one side of the temporary slag-blocking iron gate on the iron mouth side, the structural strength of the temporary slag-blocking iron gate can be protected to avoid deformation that affects the interception effect; filling the ditch material or refractory mud can ensure that the slag iron is not easy to flow out from the gap between the temporary slag-blocking iron gate position, causing the temporary slag-blocking iron gate to have a reduced interception capacity.

[0042] Fixed blocks or support structures are added to key locations of the temporary slag iron discharge ditch within the iron storage main ditch to improve its stability. Debris, residual iron, and accumulated slag are then removed from the ditch to ensure it is clean and unobstructed. High-quality, uniformly sized coke powder is then used for filling, ensuring it has good air permeability and support. The coke powder is filled in layers, with each layer immediately compacted to ensure it is tightly packed and void-free. By clearing the iron storage main ditch and controlling the coke powder filling method, a tightly packed, void-free coke powder is ensured, preventing slag iron from penetrating and facilitating subsequent cleaning.

[0043] When the blast furnace is not able to discharge slag iron through a slag skimmer, a temporary slag iron ditch is used to discharge slag iron. After the blast furnace has used the temporary slag iron ditch to discharge slag iron and reaches the working condition of using a slag skimmer to discharge slag iron, a crane is used to lift the temporary slag iron gate, and the slag iron flows through the slag skimmer to complete the slag iron separation and continue to discharge slag iron. In the early stage, when the slag skimmer is not available for slag discharge, a temporary slag discharge ditch is used to discharge slag. When the temporary slag discharge ditch has been used to discharge slag for a cycle and the slag can be discharged by the slag skimmer, the lifting lug of the temporary slag blocking gate connected to the crane hook is changed synchronously, and then the temporary slag blocking gate is lifted out from the large well area in front of the iron storage type main ditch skimmer along the inclination angle of the temporary slag blocking gate, so that the later slag can enter the slag skimmer for slag and iron discharge. By switching in this way, the slag can be discharged in time and effectively, solving the problems of untimely slag discharge and high cost of manual cleaning of slag in the temporary slag discharge ditch in the traditional method.

[0044] The present invention uses steel plates to make temporary slag-blocking iron gate plates and places the temporary slag-blocking iron gate plates at an angle of 60 degrees in the large well area in front of the iron storage type main ditch skimmer. When the blast furnace is not equipped with a slag skimmer to discharge slag iron, the temporary slag-blocking iron ditch is used to discharge slag iron. After the blast furnace uses the temporary slag-blocking iron ditch to discharge slag iron and reaches the working condition of using a slag skimmer to discharge slag iron, a crane is used to lift the temporary slag-blocking iron gate plates, and the slag iron flows through the slag skimmer to complete the slag iron separation and continuously discharge the slag iron. When the blast furnace is opened to discharge slag iron, the slag iron needs to be switched to the slag skimmer to discharge the slag iron without interruption, and the slag iron can be discharged in time and effectively, solving the problems of untimely slag iron discharge and high labor input cost in the traditional method.

[0045] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for tapping iron by switching the main ditch of an iron storage type through a slag skimmer online, characterized in that: The following steps are involved: Step 1: Before the blast furnace is started or resumed after a long-term shutdown, a temporary slag-blocking iron gate is made of steel plates; Step 2: Install the prepared temporary slag blocking iron gate in the large well area in front of the iron storage type main ditch skimmer. During installation, the temporary slag blocking gate is placed at a 60° angle in the large well area in front of the iron storage type main ditch skimmer. Step 3: Fill the space between the temporary slag blocking iron gate and the ground in the large well area in front of the iron storage type main ditch skimmer to ensure that the contact surface is tight; Step 4: Fill the iron storage main ditch with coke powder to form a temporary slag and iron discharge ditch; Step 5: In the absence of a slag skimmer to discharge slag iron, the blast furnace uses a temporary slag iron ditch to discharge slag iron; Step 6: After the blast furnace uses a temporary slag discharge ditch to discharge slag iron and reaches the working condition of using a slag skimmer to discharge slag iron, a crane is used to lift the temporary slag iron gate, and the slag iron flows through the slag skimmer to complete the slag iron separation and continue to discharge slag iron.

2. The method for tapping iron by switching the main ditch of an iron storage type through a slag skimmer online according to claim 1, characterized in that: When the temporary slag blocking iron gate is manufactured in step 1, the shape of the temporary slag blocking iron gate is adapted to the cross-sectional shape of the large well area in front of the iron storage type main ditch skimmer.

3. The method for tapping iron by switching the main ditch of an iron storage type through a slag skimmer online according to claim 2, characterized in that: When the temporary slag-blocking iron gate is manufactured in step 1, the temporary slag-blocking iron gate is further provided with a lifting lug adapted to a lifting hook on a crane.

4. The method for tapping iron by switching the main ditch of an iron storage type through a slag skimmer online according to claim 1, characterized in that: When the temporary slag blocking gate in step 2 is placed at an angle of 60° in the large well area in front of the iron storage type main ditch skimmer, it is also necessary to control the side of the temporary slag blocking iron gate containing the castable material to face the taphole.

5. The method for tapping iron by switching the main ditch of an iron storage type through a slag skimmer online according to claim 1, characterized in that: The specific operations of filling the space between the temporary slag-blocking iron gate and the ground of the large well area in front of the iron storage type main ditch skimmer in step three include: filling the space between the temporary slag-blocking iron gate and the ground of the large well area in front of the iron storage type main ditch skimmer with ditch material or refractory mud, and ensuring that the ditch material or refractory mud is filled evenly during the filling.

6. The method for tapping iron by switching the main ditch of an iron storage type through a slag skimmer online according to claim 5, characterized in that: In the step three, the ditch material or refractory mud is dried after being filled. The temperature of the ditch material or refractory mud needs to be slowly increased during drying, and the temperature distribution in the baking area needs to be controlled to be uniform to avoid local overheating or overcooling.

7. The method for tapping iron by switching the main ditch of an iron storage type through a slag skimmer online according to claim 6, characterized in that: After the trench material or refractory mud is dried in step 3, coke powder needs to be filled on one side of the temporary slag blocking iron gate on one side of the iron mouth.

8. The method for tapping iron by switching the main ditch of an iron storage type through a slag skimmer online according to claim 1, characterized in that: In the fourth step, before the iron storage type main ditch is filled with coke powder, a fixing block or a supporting structure is added to a key position of the temporary slag iron discharge ditch in the iron storage type main ditch to improve the stability of the temporary slag iron discharge ditch.

9. The method for tapping iron by switching the main ditch of an iron storage type through a slag skimmer online according to claim 8, characterized in that: When the iron storage type main trench is filled with coke powder in step 4, it is first necessary to clean out the debris, residual iron and accumulated slag in the iron storage type main trench to ensure that the trench is clean and unobstructed, and then select coke powder with uniform particle size and high quality for filling to ensure that the coke powder has good air permeability and support.

10. The method for tapping iron by switching the main channel of an iron storage type through a slag skimmer online according to claim 9, characterized in that: When the iron storage type main trench is filled with coke powder in the step 4, the coke powder is filled in layers, and a layer of coke powder is immediately compacted after being filled to ensure that the coke powder is tightly filled without gaps.

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