A slag-liquid separation device and separation method for a strip hot-dip galvanizing production line

Abstract

The invention discloses a slag-liquid separation device and a separation method for a strip hot-dip galvanizing production line. The separation device comprises a fume hood, a slag ash bucket platform is fixed on one side of the inner wall of the fume hood, a side opening for placing the slag ash bucket is provided on the surface of the fume hood close to the slag ash bucket platform, and a side door is matched and installed on the outside of the side opening, and the upper port of the fume hood is fixedly connected to a dust removal flue through a flange, and a dust removal bag cage is installed inside the dust removal flue. The invention turns a large amount of zinc alloy that originally needs to be transported out for treatment into zinc melt used in the hot-dip production line, and only a very small amount of slag ash needs to be treated, and the slag ash can be treated only by hydrometallurgy, which has significant advantages in energy saving and consumption reduction, greatly saves costs, has significant economic and social benefits, effectively treats the flue gas and dust in the slag-liquid separation, makes the air on the site of the hot-dip galvanizing production line clean, thereby ensuring that the surface quality of the galvanized steel strip is not affected.

Description

Technical Field

[0001] The invention belongs to the technical field of zinc slag separation in hot-dip galvanizing production, and in particular relates to a slag-liquid separation device and a separation method for a strip steel hot-dip galvanizing production line. Background Art

[0002] At present, during the hot-dip production of strip steel, hot-dip galvanizing enterprises produce a large amount of waste zinc slag in the zinc pot, and the slag production rate accounts for about 10% of the hot-dip galvanized alloy ingots. For some thin-coated products, the slag production rate is even more than 16%. In fact, there is not so much real slag. It is mainly because the slag is bonded with the zinc alloy melt. When the slag is removed, a large amount of zinc alloy melt is taken away. At present, hot-dip galvanizing enterprises mainly deal with waste slag by selling it to recycling enterprises at a low price. For this waste zinc slag, recycling enterprises mainly use pyrometallurgy and hydrometallurgy to process it, which has high power consumption, large metal loss and high processing cost. So far, no technical solution for slag-liquid separation in the zinc pot of a hot-dip galvanizing production line for strip steel has been found. The main reasons are: on the one hand, no method for slag-liquid separation has been found; on the other hand, even if a method for slag-liquid separation is found, a large amount of smoke and dust will be generated during the slag-liquid separation process due to chemical reactions, and the hot-dip galvanizing production line requires cleanliness, otherwise it will pollute and corrode the hot-dip equipment. At the same time, the hot-dip strip has high quality requirements. If dust sticks to the hot-dip galvanized steel strip, waste will be produced. So far, there is no solution.

[0003] In view of this, the present invention is proposed. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a slag-liquid separation device and a separation method for a strip hot-dip galvanizing production line. To solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0005] A slag-liquid separation device for a strip hot-dip galvanizing production line comprises a smoke extraction hood, a slag ash bucket platform is fixed to one side of the inner wall of the smoke extraction hood, a side opening for placing the slag ash bucket is provided on the surface of the smoke extraction hood close to the slag ash bucket platform, and a side door is matched with the side opening, the upper port of the smoke extraction hood is fixedly connected to a dust removal flue through a flange, and a dust removal bag cage is installed inside the dust removal flue, the upper end of the dust removal flue is also fixedly connected to a pipe through a flange, and the other end of the pipe is connected to an exhaust pump, a front opening is provided at a lower position on the front surface of the smoke extraction hood, and a front door matched with the front opening is also provided inside the front opening.

[0006] Furthermore, the dust removal flue is configured to be a hollow cylinder.

[0007] Furthermore, the fume hood is made of 316L stainless steel.

[0008] Furthermore, a dark door frame that is twice as high as the front door is fixedly provided on the inner wall of the smoke hood at the inner edge of the front opening, and the front door is slidably clamped in a slide groove on the inner side of the dark door frame, and permanent magnetic strips with opposite poles are fitted on the upper end surface of the front door and the upper top wall of the dark door frame, and a plurality of matching plug rods and damping sockets are respectively installed in an array on the opposite surfaces of the two permanent magnetic strips.

[0009] Furthermore, the surface of the insertion rod is frosted, and elastic clips are fixed on both sides of the inner wall of the damping socket.

[0010] Furthermore, the dust bag cage may also be replaced by a bag dust collector.

[0011] A method for separating slag and liquid in a strip hot-dip galvanizing production line comprises the following steps:

[0012] S1: Install the separation device: A fume hood is installed above the liquid level of the zinc pot for hot-dip galvanizing of strip steel. The fume hood is made of 316L stainless steel. The bottom of the fume hood is extended to the liquid level of the zinc pot to a depth of 300mm. The upper port of the fume hood is connected to the dust removal flue through a flange, and a dust bag cage is installed inside the dust removal flue;

[0013] S2: Collecting zinc slag: The inside of the zinc pot of hot-dip galvanized steel strip is normally galvanized, and the sinking roller is located below the liquid surface of the zinc pot. The hot-dip galvanized steel strip is normally galvanized under the action of the sinking roller. During the galvanizing process, a large amount of zinc slag will be generated on the surface of the zinc pot. Use a long rod to help push the front door upward, and move the slag on the surface of the zinc pot through the colander and along the liquid surface from the front port to the inside of the smoke hood, and lower the front door so that the slag is not removed;

[0014] S3: Slag-liquid separation: Then open the side door, put the slag ash bucket into the slag ash bucket platform, then close the side door, turn on the vacuum pump to evacuate, put the zinc chloride or ammonium chloride wrapped in newspaper into the bell jar, extend the bell jar into the zinc pot liquid surface and press it down to 200mm below the slag inside the fume hood, move it parallelly, rotate it, and stir it. At this time, a large amount of smoke is generated. Adjust the power of the vacuum pump (i.e., the exhaust intensity) to ensure that the smoke does not escape from the fume hood. The slag-liquid separation operation is completed;

[0015] S4: Slag removal: A layer of slag ash is generated on the surface of the solution in the fume hood. Use a colander to scoop up the slag ash and put it into the slag ash bucket in the fume hood. After the slag is removed, open the side door, cover the slag ash bucket with a sealing cover, take out the slag ash bucket, turn off the vacuum pump, close the side door, move the slag ash bucket to other places outside the workshop, and bag it after it is completely cooled. The whole process is completed; when there is more slag on the surface of the zinc pot, repeat the above operation.

[0016] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0017] The present invention converts a large amount of zinc alloy that originally needed to be transported out for treatment into zinc melt used in the hot-dip galvanizing production line. Only a very small amount of slag ash needs to be processed, and the slag ash can be processed only by hydrometallurgy. It has significant advantages in energy saving and consumption reduction, greatly saves costs, has significant economic and social benefits, and effectively processes the smoke and dust in the slag-liquid separation, so that the air on site of the hot-dip galvanizing production line is clean, thereby ensuring that the surface quality of the galvanized steel strip is not affected.

[0018] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are part of this application and are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0020] Figure 1 This is a schematic diagram of the overall use state of an embodiment of the present invention;

[0021] Figure 2 A cross-sectional view of a smoke extraction hood according to an embodiment of the present invention;

[0022] Figure 3 This is an external view of a smoke extraction hood according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the installation relationship between the hidden door frame and the front door according to an embodiment of the present invention;

[0024] Figure 5 It is a cross-sectional view of a damping jack structure according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the colander structure according to an embodiment of the present invention;

[0026] Figure 7 This is a front view of the bell structure of an embodiment of the present invention;

[0027] Figure 8 It is a right side view of the bell jar structure according to one embodiment of the present invention.

[0028] In the figure: 1-exhaust hood; 2-slag ash bucket platform; 3-slag ash bucket; 4-side door; 5-front door; 6-dust removal flue; 7-dust bag cage; 8-exhaust pump; 9-blind door frame; 10-permanent magnetic strip; 11-insertion rod; 12-damping socket; 13-elastic clip; 14-strainer; 15-bell jar; 16-hot-dip galvanized steel strip; 17-zinc pot liquid level; 18-zinc pot; 19-sinking roller.

[0029] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention. Example

[0031] like Figures 1 to 8As shown, a slag-liquid separation device for a strip hot-dip galvanizing production line comprises a fume hood 1, a slag ash bucket platform 2 is provided on one side of the inner wall of the fume hood 1, a side opening for placing the slag ash bucket 3 is provided on the surface of the fume hood 1 close to the slag ash bucket platform 2, and a side door 4 is installed on the outside of the side opening, and a vent is provided on the side door 4, an upper port of the fume hood 1 is fixedly connected to a dust removal flue 6 through a flange, and a dust bag cage 7 is installed inside the dust removal flue 6, the upper end of the dust removal flue 6 is also fixedly connected to a pipe through a flange, and the other end of the pipe is connected to an exhaust pump 8, a front opening is provided on the front surface of the fume hood 1 at a lower position, and a front door 5 is also provided on the inner side of the front opening to match it. When in use, the fume hood 1 is placed in the solution liquid surface of the zinc pot 18 used for hot-dip galvanizing of strip steel. The inside of the zinc pot 18 is normally galvanized. The sinking roller 19 is located below the zinc pot liquid surface 17. The hot-dip galvanized steel strip 16 is normally galvanized under the action of the sinking roller 19. During the galvanizing process, a large amount of zinc slag will be generated on the zinc pot liquid surface 17. The bottom of the fume hood 1 is extended to a depth of 300 mm to the zinc pot liquid surface 17. The front door 5 is pushed upward with the assistance of a long rod. The scum on the zinc pot liquid surface is moved horizontally from the front port to the inside of the fume hood 1 through the colander 14 along the liquid surface. The front door 5 is lowered so that the scum is not removed. Then the side door 4 is opened, the slag ash bucket 3 is placed on the slag ash bucket platform 2, and then the side door 4 is closed. The vacuum pump 8 is turned on for exhaust. External wind is supplemented to the exhaust from the vent hole of the side door 4. Inside the hood 1, the operator stands on the platform 2 for placing the slag ash bucket, puts the zinc chloride or ammonium chloride wrapped in newspaper into the bell jar 15, extends the bell jar 15 into the zinc pot liquid level 17 and presses it down to 200mm below the slag inside the hood, moves it parallely, rotates it, and stirs it. At this time, a large amount of smoke is generated. The power of the vacuum pump 8 (i.e., the exhaust intensity) is adjusted to ensure that the smoke does not escape from the hood 1. After the slag liquid separation operation is completed, a layer of slag ash is generated on the liquid surface of the solution in the hood 1. The operator uses a colander 14 to pick up the slag ash and put it into the slag ash bucket 3 in the hood 1. After the slag is taken, the side door 4 is opened, the slag ash bucket sealing cover is covered, the slag ash bucket 3 is taken out, the vacuum pump 8 is turned off, the side door 4 is closed, and the slag ash bucket 3 is moved to other places outside the workshop. After cooling thoroughly, it is bagged, and the whole process is completed. When there is more slag on the zinc pot liquid surface, repeat the above operation. After a period of production, if the zinc pot needs to be repaired, the smoke hood 1 and the dust removal flue 6 are disassembled and the smoke hood 1 is lifted off the zinc pot. Here, the zinc pot equipment is relatively large, especially the slag ash bucket platform 2 can be used for operators to stand and work on the platform. Operators should strictly follow the zinc pot safety construction management method to ensure safe production. The vents opened by the side door 4 can replenish the air pressure in the smoke hood 1. At the same time, close to the working platform, the airflow takes away the smoke to provide a good ventilation environment for operators.

[0032] In this example, the dust removal flue 6 is arranged in a hollow cylindrical shape, which is convenient for installing a dust removal bag cage 7 capable of purifying air. The dust removal bag cage 7 can also be replaced by a bag dust collector.

[0033] In this example, the lower part of the fume hood 1 is made of 316L stainless steel resistant to zinc liquid corrosion because it is often in contact with the melt. Otherwise, when ordinary carbon steel is used, special coating should be sprayed on its lower surface.

[0034] The inner wall of the smoke hood 1 is fixedly provided with a dark door frame 9 which is twice higher than the front door 5 at the inner edge of the front opening. The front door 5 is slidably clamped in the sliding groove inside the dark door frame 9, and the upper end surface of the front door 5 and the upper top wall of the dark door frame 9 are fitted with permanent magnetic strips 10 with opposite poles on the opposite surfaces. The opposite surfaces of the two permanent magnetic strips 10 are respectively array-mounted with a plurality of matching plug rods 11 and damping sockets 12. After the front door 5 is pushed upward, the upper and lower permanent magnetic strips 10 attract each other, and the plug rod 11 is inserted into the damping socket 12 to generate a damping force. The surface of the plug rod 11 is frosted, and elastic clips are fixed on both sides of the inner wall of the damping socket 12 to prevent the front door 5 from falling. When the front door needs to be moved down, the door handle on the front side of the front door 5 can be hooked with a long hook and downward force can be applied. When the front door 5 falls completely, the gravitational force is reduced due to the long distance, and the front door 5 can remain in a closed state. It should be noted that the control and utilization of the magnetic size of permanent magnetic strips is already an existing technology. This is just an application. Of course, electromagnetic equipment can also be used as long as it meets the requirements of opening and closing the door.

[0035] The separation method comprises the following steps:

[0036] S1: Install the separation device: A fume hood is installed above the liquid level of the zinc pot for hot-dip galvanizing of strip steel. The fume hood is made of 316L stainless steel. The bottom of the fume hood is extended to the liquid level of the zinc pot to a depth of 300mm. The upper port of the fume hood is connected to the dust removal flue through a flange, and a dust bag cage is installed inside the dust removal flue;

[0037] S2: Collecting zinc slag: The inside of the zinc pot of hot-dip galvanized steel strip is normally galvanized, and the sinking roller is located below the liquid surface of the zinc pot. The hot-dip galvanized steel strip is normally galvanized under the action of the sinking roller. During the galvanizing process, a large amount of zinc slag will be generated on the surface of the zinc pot. Use a long rod to help push the front door upward, and move the slag on the surface of the zinc pot through the colander and along the liquid surface from the front port to the inside of the smoke hood, and lower the front door so that the slag is not removed;

[0038] S3: Slag-liquid separation: Then open the side door, put the slag ash bucket into the slag ash bucket platform, then close the side door, turn on the vacuum pump to evacuate, put the zinc chloride or ammonium chloride wrapped in newspaper into the bell jar, extend the bell jar into the zinc pot liquid surface and press it down to 200mm below the slag inside the fume hood, move it parallelly, rotate it, and stir it. At this time, a large amount of smoke is generated. Adjust the power of the vacuum pump (i.e., the exhaust intensity) to ensure that the smoke does not escape from the fume hood. The slag-liquid separation operation is completed;

[0039] S4: Slag removal: A layer of slag ash is generated on the surface of the solution in the fume hood. Use a colander to scoop up the slag ash and put it into the slag ash bucket in the fume hood. After the slag is removed, open the side door, cover the slag ash bucket with a sealing cover, take out the slag ash bucket, turn off the vacuum pump, close the side door, move the slag ash bucket to other places outside the workshop, and bag it after it is completely cooled. The whole process is completed; when there is more slag on the surface of the zinc pot, repeat the above operation.

[0040] The present invention converts a large amount of zinc alloy that originally needed to be transported out for treatment into zinc melt used in the hot-dip galvanizing production line. Only a very small amount of slag ash needs to be processed, and the slag ash can be processed only by hydrometallurgy. It has significant advantages in energy saving and consumption reduction, greatly saves costs, has significant economic and social benefits, and effectively processes the smoke and dust in the slag-liquid separation, so that the air on site of the hot-dip galvanizing production line is clean, thereby ensuring that the surface quality of the galvanized steel strip is not affected.

[0041] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A method for separating slag from liquid in a strip hot-dip galvanizing production line, characterized in that: A slag-liquid separation device for a strip hot-dip galvanizing production line is used, the device comprising a fume hood (1), a slag ash bucket platform (2) is provided on one side of the inner wall of the fume hood (1), a side opening for placing the slag ash bucket (3) is provided on the surface of the fume hood (1) close to the slag ash bucket platform (2), and a side door (4) is installed outside the side opening to match, and a vent hole is provided on the side door 4, the upper end of the fume hood (1) is connected to a dust removal duct (6) through a flange, and a dust bag cage (7) is installed inside the dust removal duct (6), the upper end of the dust removal duct (6) is also connected to a pipe through a flange, and the other end of the pipe is connected to an exhaust pump (8), the front surface of the fume hood (1) is provided with a front opening at a lower position, and a front door (5) is also provided inside the front opening to match it; The slag-liquid separation method comprises the following steps: S1: Installing the separation device: A fume hood (1) is arranged above the zinc pot liquid level (17) of the hot-dip galvanized steel strip. The fume hood (1) is made of 316L stainless steel. The bottom of the fume hood (1) is extended to a depth of 300 mm below the zinc pot liquid level (17). The upper end of the fume hood (1) is connected to a dust removal flue (6) through a flange, and a dust removal bag cage (7) is installed inside the dust removal flue (6); S2: Collecting zinc slag: The inside of the hot-dip galvanized zinc pot (18) of the steel strip is normally galvanized, and the sinking roller (19) is located below the zinc pot liquid surface (17). The hot-dip galvanized steel strip (16) is normally galvanized under the action of the sinking roller (19). During the galvanizing process, a large amount of zinc slag will be generated on the zinc pot liquid surface (17). The front door (5) is pushed upward with the assistance of a long rod, and the slag on the zinc pot liquid surface is moved horizontally from the front port to the inside of the smoke hood (1) through the colander (14) along the liquid surface, and the front door (5) is lowered so that the slag is not removed; S3: Slag-liquid separation: Then open the side door (4), put the slag ash bucket (3) into the slag ash bucket platform (2), then close the side door (4), turn on the vacuum pump (8) to evacuate, put the zinc chloride or ammonium chloride wrapped in newspaper into the bell jar (15), extend the bell jar (15) into the zinc pot liquid surface (17) and press it down to 200mm below the slag inside the smoke hood, move it parallelly, rotate it, and stir it. At this time, a large amount of smoke is generated. Adjust the power (i.e., the exhaust intensity) of the vacuum pump (8) to ensure that the smoke does not escape from the smoke hood (1). The slag-liquid separation operation is completed; S4: Slag removal: A layer of slag ash is generated on the surface of the solution in the fume hood (1). The slag ash is scooped up with a colander (14) and placed in a slag ash bucket (3) in the fume hood (1). After the slag removal is completed, the side door (4) is opened, the slag ash bucket sealing cover is closed, the slag ash bucket (3) is taken out, the vacuum pump (8) is turned off, the side door (4) is closed, and the slag ash bucket (3) is moved to another place outside the workshop. After being completely cooled, the slag ash is bagged. The whole process is completed. When there is more slag on the surface of the zinc pot, the above operation is repeated.

2. The slag-liquid separation method for a strip hot-dip galvanizing production line according to claim 1, characterized in that: The dust removal flue (6) is configured to be in a hollow cylindrical shape.

3. The slag-liquid separation method for a strip hot-dip galvanizing production line according to claim 1, characterized in that: The smoke hood (1) is made of 316L stainless steel.

4. The method for separating slag from liquid in a hot-dip galvanizing production line for steel strip according to claim 1, characterized in that: A hidden door frame (9) twice as high as the front door (5) is fixedly arranged on the inner wall of the smoke hood (1) at the inner edge of the front opening, and the front door (5) is slidably clamped in a slide groove on the inner side of the hidden door frame (9), and permanent magnetic strips (10) with opposite poles are fitted on the upper end surface of the front door (5) and the upper top wall of the hidden door frame (9), and the opposite surfaces of the two permanent magnetic strips (10) are respectively array-mounted with a plurality of plug rods (11) and damping sockets (12) that match each other.

5. The method for separating slag from liquid in a hot-dip galvanizing production line for steel strip according to claim 4, characterized in that: The surface of the insertion rod (11) is frosted, and elastic clips are fixed on both sides of the inner wall of the damping insertion hole (12).

6. The method for separating slag from liquid in a hot-dip galvanizing production line for steel strip according to claim 1, characterized in that: The dust bag cage (7) can also be replaced by a bag dust collector.

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