Device for smelting high-purity pig iron and reducing slag amount of molten iron

Abstract

The utility model provides a device for smelting high-purity pig iron and reducing slag carrying amount of molten iron, which comprises a blast furnace, a main iron runner, a first sand stopper, a second sand stopper, a skimmer, a branch iron runner, a molten iron tank, a slag runner and a water granulated slag punching box, a blast furnace iron notch is arranged at the bottom of the blast furnace and is connected with one side of the main iron runner, the other side of the main iron runner is connected with the skimmer, and the slag runner is connected with the water granulated slag punching box. The skimmer is connected with one side of the branch iron runner, the other side of the branch iron runner is connected with the molten iron tank, the main iron runner is provided with at least one sand baffle, the sand baffle is connected with the slag runner, and the slag runner is connected with the water slag punching box. According to the utility model, the slag content in molten iron can be effectively reduced, and the product quality of high-purity pig iron is improved.

Description

Technical Field

[0001] This utility model relates to the field of ironmaking technology, and in particular to a device for reducing the amount of slag in molten iron when smelting high-purity pig iron. Background Technology

[0002] High-purity pig iron is a key basic material for high-end cast iron parts. With the development of my country's economy, the application of high-purity pig iron in high-end equipment manufacturing is becoming more and more widespread, and the requirements are also becoming more and more stringent. In the blast furnace smelting of high-purity pig iron, molten iron and molten slag flow out together from the taphole, passing through the main tapping channel and skimmer. Due to the difference in density, the slag and molten iron are separated. However, due to the presence of the slag-iron interface, complete separation cannot be achieved. Generally, the slag content in the molten iron is about 10%. The slag that enters the molten iron remains on the surface of the cast iron blocks, affecting not only the surface quality of the blast furnace pig iron but also the quality of subsequent castings. Utility Model Content

[0003] To address the aforementioned technical problems, this invention provides a device for reducing slag content in molten iron during the smelting of high-purity pig iron. This device effectively reduces the slag content in the molten iron, controlling it to below 5%, thereby improving the product quality of high-purity pig iron. The technical means employed in this invention are as follows:

[0004] A device for reducing slag content in molten iron during the smelting of high-purity pig iron includes: a blast furnace, a main iron trough, a first sand baffle, a second sand baffle, a slag skimmer, a supporting iron trough, a molten iron ladle, a slag trough, and a water-slag flushing box. The bottom of the blast furnace is provided with a blast furnace taphole, which is connected to one side of the main iron trough. The other side of the main iron trough is connected to the slag skimmer, which is connected to one side of the supporting iron trough. The other side of the supporting iron trough is connected to the molten iron ladle. At least one sand baffle is provided on the main iron trough, which is connected to the slag trough. The slag trough is connected to the water-slag flushing box.

[0005] Furthermore, the main iron trough is provided with a sand baffle one and a sand baffle two, with the sand baffle two located between the sand baffle one and the skimmer.

[0006] Furthermore, the distance between the sand baffle and the skimmer is 3.5-4.5m.

[0007] Furthermore, the height of the upper surface of the sand barrier is 150-200mm.

[0008] Furthermore, the distance between the sand baffle and the skimmer is 1.5-2m.

[0009] Furthermore, the height of the upper surface of the second sand barrier is 200-230mm.

[0010] Furthermore, the main iron trough and the branch iron trough are inclined. The end of the main iron trough that connects to the blast furnace taphole is the high end, and the end that connects to the slag skimmer is the low end. The end of the branch iron trough that connects to the slag skimmer is the high end, and the end that connects to the molten iron ladle is the low end.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] 1. The device for reducing slag content in molten iron when smelting high-purity pig iron provided by this utility model can effectively reduce the slag content in molten iron and control the slag content in molten iron to within 5%, thereby improving the product quality of high-purity pig iron.

[0013] 2. The device for reducing the amount of slag in molten iron when smelting high-purity pig iron provided by this utility model utilizes the principle of the large difference in specific gravity between slag and iron. The lighter slag is successfully separated by the device. When the slag-iron molten iron surface fluctuates, the slag can also be flexibly separated by adjusting the height of the sand baffle, thereby ensuring the purity of the molten iron.

[0014] Based on the above reasons, this utility model can be widely promoted in the fields of metallurgy and other fields. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] In the diagram: 1. Blast furnace; 2. Blast furnace taphole; 3. Main iron trough; 4. Sand baffle one; 5. Sand baffle two; 6. Slag skimmer; 7. Support iron trough; 8. Molten iron ladle; 9. Slag trough; 10. Slag flushing box. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] This invention provides a device for reducing the amount of slag in molten iron during the smelting of high-purity pig iron. It can separate the slag from the molten iron to the maximum extent, thereby reducing the slag content in the molten iron and improving the surface quality of high-purity pig iron for casting.

[0020] This utility model discloses a device for reducing slag content in molten iron during the smelting of high-purity pig iron, comprising: a blast furnace 1, a main iron trough 3, a sand baffle 1 4, a sand baffle 2 5, a slag skimmer 6, a supporting iron trough 7, a molten iron ladle 8, a slag trough 9, and a slag flushing box 10. The bottom of the blast furnace 1 is provided with a blast furnace taphole 2, which is connected to one side of the main iron trough 3. The other side of the main iron trough 3 is connected to the slag skimmer 6, which is connected to one side of the supporting iron trough 7. The other side of the supporting iron trough 7 is connected to the molten iron ladle 8. At least one sand baffle is provided on the main iron trough 3, which is connected to the slag trough 9. The slag trough 9 is connected to the slag flushing box 10.

[0021] Preferably, the main iron trough 3 is provided with a first sand baffle 4 and a second sand baffle 5, with the second sand baffle 5 located between the first sand baffle 4 and the skimmer 6. The distance between the first sand baffle 4 and the skimmer 6 is 3.5-4.5m. The upper surface height of the first sand baffle 4 is 150-200mm. The distance between the second sand baffle 5 and the skimmer 6 is 1.5-2m. The upper surface height of the second sand baffle 5 is 200-230mm. In this embodiment, the distance between the first sand baffle 4 and the skimmer 6 is 4m, and the upper surface height of the first sand baffle 4 is 200mm. The distance between the second sand baffle 5 and the skimmer 6 is 2m. The upper surface height of the second sand baffle 5 is 210mm.

[0022] Preferably, the main iron trough 3 and the branch iron trough 7 are inclined. The end of the main iron trough 3 that is connected to the blast furnace taphole 2 is the high end, and the end that is connected to the slag skimmer 6 is the low end. The end of the branch iron trough 7 that is connected to the slag skimmer 6 is the high end, and the end that is connected to the molten iron ladle 8 is the low end.

[0023] In this invention, high-purity pig iron molten iron flows from the blast furnace taphole 2 of blast furnace 1, then flows along the main iron trough 3, through the slag skimmer 6 and the branch iron trough 7, and finally into the molten iron ladle 8. Within the main iron trough 3, the flow rate of the molten iron slows down, and the density of the molten iron is 7.0 t / m³. 3 The density of the slag liquid is 2.2 t / m³. 3 Due to the density difference, the slag floats on top of the molten iron. Two sand baffles are set at positions 2m and 4m in front of the skimmer 6. When the slag level rises to 20mm from the upper edge of sand baffle 4, sand baffle 4 is opened, thereby achieving effective separation of slag and molten iron. Specifically:

[0024] 1. Set up a sand baffle 4 at a distance of 4m in front of the slag skimmer 6 (sand baffle 5 is set at a distance of 2m in front of the slag skimmer 6). The upper surface of the sand baffle 4 is at the same height as the main iron trough 3, with a height of 200mm.

[0025] 2. When tapping iron, when the slag liquid in the main iron trough 3 is 20mm away from the upper edge of the sand baffle 4, the sand baffle 4 is opened, and the slag liquid flows into the slag trough 9 through the sand baffle 4, and then enters the water slag flushing box 10 through the slag trough 9.

[0026] 3. After sand baffle 4 has been open for 20 minutes, open sand baffle 5 to allow more slag liquid to flow into slag ditch 9 through sand baffle 5.

[0027] 4. After the slag and iron are removed, clean up the remaining slag and iron near each sand block, and then spread river sand on it for use in the next iron tapping.

[0028] Compared with traditional methods, this invention can reduce the slag content in molten iron to less than 5%, which can effectively improve the surface quality of high-purity pig iron.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A device for reducing slag content in molten iron during the smelting of high-purity pig iron, characterized in that, include: The blast furnace (1), main iron trough (3), sand baffle one (4), sand baffle two (5), slag skimmer (6), supporting iron trough (7), molten iron ladle (8), slag trough (9) and slag flushing box (10) are provided. The bottom of the blast furnace (1) is provided with a blast furnace taphole (2). The blast furnace taphole (2) is connected to one side of the main iron trough (3). The other side of the main iron trough (3) is connected to the slag skimmer (6). The slag skimmer (6) is connected to one side of the supporting iron trough (7). The other side of the supporting iron trough (7) is connected to the molten iron ladle (8). At least one sand baffle is provided on the main iron trough (3). The sand baffle is connected to the slag trough (9). The slag trough (9) is connected to the slag flushing box (10).

2. The apparatus for reducing slag content in molten iron during the smelting of high-purity pig iron according to claim 1, characterized in that, The main iron ditch (3) is provided with a sand baffle one (4) and a sand baffle two (5), with the sand baffle two (5) located between the sand baffle one (4) and the skimmer (6).

3. The apparatus for reducing slag content in molten iron during the smelting of high-purity pig iron according to claim 2, characterized in that, The distance between the sand block (4) and the skimmer (6) is 3.5-4.5m.

4. The apparatus for reducing slag content in molten iron during the smelting of high-purity pig iron according to claim 3, characterized in that, The height of the upper surface of the sand barrier (4) is 150-200mm.

5. The apparatus for reducing slag content in molten iron during the smelting of high-purity pig iron according to claim 2, characterized in that, The distance between the sand baffle (5) and the skimmer (6) is 1.5-2m.

6. The apparatus for reducing slag content in molten iron during the smelting of high-purity pig iron according to claim 5, characterized in that, The height of the upper surface of the second sand barrier (5) is 200-230mm.

7. The apparatus for reducing slag content in molten iron during the smelting of high-purity pig iron according to claim 1, characterized in that, The main iron trough (3) and the branch iron trough (7) are inclined. The end of the main iron trough (3) connected to the blast furnace taphole (2) is the high end, and the end connected to the slag skimmer (6) is the low end. The end of the branch iron trough (7) connected to the slag skimmer (6) is the high end, and the end connected to the molten iron ladle (8) is the low end.

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