CN115058547A - Thermal state casting residue recovery processing device and method and recovery application - Google Patents
Thermal state casting residue recovery processing device and method and recovery application Download PDFInfo
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- CN115058547A CN115058547A CN202210596956.7A CN202210596956A CN115058547A CN 115058547 A CN115058547 A CN 115058547A CN 202210596956 A CN202210596956 A CN 202210596956A CN 115058547 A CN115058547 A CN 115058547A
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- 238000005266 casting Methods 0.000 title claims abstract description 152
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000011084 recovery Methods 0.000 title claims abstract description 21
- 239000002893 slag Substances 0.000 claims abstract description 230
- 239000010959 steel Substances 0.000 claims abstract description 110
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 107
- 238000004064 recycling Methods 0.000 claims abstract description 24
- 239000011248 coating agent Substances 0.000 claims abstract description 14
- 238000000576 coating method Methods 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000009749 continuous casting Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 9
- 229910001018 Cast iron Inorganic materials 0.000 claims description 3
- 229910001208 Crucible steel Inorganic materials 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 36
- 229910052742 iron Inorganic materials 0.000 description 18
- 239000002699 waste material Substances 0.000 description 10
- 239000007788 liquid Substances 0.000 description 9
- 238000005507 spraying Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/10—Slag pots; Slag cars
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/466—Charging device for converters
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a device and a method for recycling thermal-state casting residue and recycling application. The processing device includes: the bottom of the slag tank positioned at the slag receiving position is paved with a layer of steel slag tailings, the granularity of the steel slag tailings is 5-50mm, the water content of the steel slag tailings is less than 1 percent, and the thickness of the steel slag tailings is 300-350 mm; a grating is arranged in the slag pot and divides the slag pot into a plurality of spaces; the inner wall of the slag pot is sprayed with a high-temperature resistant anti-bonding coating, and the thickness of the coating is not less than 1 mm; the tank holding trolley is arranged on one side of the slag tank, can transport the slag tank to a casting residue treatment site, and can pour out casting residue in the slag tank; the hoisting mechanism is provided with a steel hopper and can convey the casting residues with the temperature of 800-. The hot-state casting residue is divided into a plurality of small blocks for recycling, the recovery rate reaches 100 percent, and the recovery rate of the hot-state casting residue is effectively improved.
Description
Technical Field
The invention belongs to the field of comprehensive utilization of metallurgical resources, and particularly relates to a thermal-state casting residue recycling device and method and recycling application.
Background
The casting residue is a mixture of molten steel and steel slag left after the molten steel in a ladle is subjected to continuous casting, and the temperature of the casting residue is usually about 1500 ℃. The casting residue has high metal content and high temperature. Therefore, how to effectively recover the metal and the heat thereof in the casting residue and reduce the carbon emission has received extensive attention of the industry.
At present, most iron and steel enterprises adopt a slag pot to collect casting slag. In order to avoid the casting residues from being cooled in the slag pot to form large slag lumps, domestic enterprises such as first steel, horse steel and the like adopt a grating process to divide the casting residues into small blocks and then return to steel making for use. The process effectively reduces the proportion of the casting residue to form the large slag lump, but due to the restriction of factors such as site layout of steel mills, temperature range of high-temperature magnetic disks and the like, the casting residue steel treated by the grating in domestic steel mills at present is cold and returns to the converter for use, and the loss of heat of the casting residue is caused. In order to effectively recover the heat of the casting residues, some domestic steel mills directly return hot liquid casting residues to a ladle, a converter and the like, but the return rate is not very high due to the restriction of factors such as steel types, field conditions and the like.
Through retrieval, the patent with the application number of 202010239300.0 discloses an energy-saving and emission-reducing method for recycling hot casting slag, wherein the steel ladle casting slag is recycled before converter tapping or after the converter tapping. The recovery is carried out according to low-carbon steel, medium-carbon steel and variety steel respectively, and the variety steel with special requirements is not recovered. The maximum recovery rate of the hot slag can only reach 60 percent.
Further, as disclosed in the patent application No. 201811557461.3, a method for recycling hot casting slag of a steel ladle in a converter is disclosed, in which the hot casting slag remaining in the steel ladle after the completion of the casting of molten steel is returned to the converter steelmaking process for recycling. The method comprises the following specific steps: carrying out slagging-off operation after carrying out desulfurization pretreatment on molten iron in a molten iron tank; and (3) transporting the molten iron tank to a furnace, then transporting the steel ladle filled with the hot-state casting residue to a feeding port of the molten iron tank, pouring the steel ladle into the surface of the molten iron, then transporting the molten iron tank truck back to the molten iron receiving bay, and adding the molten iron into a converter for converter smelting. The method needs to convey the molten iron tank to the molten iron receiving bay firstly, then convey the molten iron receiving bay back to the molten iron receiving bay after the molten iron receiving bay is completely filled with casting residues, increases logistics scheduling, and has certain influence on production rhythm.
Further, as disclosed in the patent application No. 201810207217.8, a method for recovering molten steel by returning hot casting slag to a ladle is disclosed, in which a holding furnace provided in a molten steel receiving bay is used to receive and circulate a plurality of ladles of casting slag, and the holding furnace is used to supplement heat to the casting slag so as to maintain the casting slag in a molten state. The slag is processed by adopting mature and advanced roller technology, the residual molten steel is received by the baked ladle and is conveyed to the molten iron receiving bay by the bay trolley to be fully mixed with the molten iron, and the molten iron is added into the converter after being desulfurized, so that the thermal recovery of the residual molten steel in the casting residue is realized. The method is limited by factors such as steel grade characteristics, field conditions and the like, and 100% recycling of the hot-state casting residue cannot be realized.
Further, as disclosed in the patent application No. 202011050648.1, a method for directly returning hot casting slag to a converter includes the steps of: 1) preparing a foundry ladle; 2) receiving molten iron; 3) transferring the foundry ladle; 4) receiving casting residues; 5) transferring the casting residues; 6) returning the casting residue to the converter.
In summary, the prior art for recovering the casting slag metal and the heat thereof cannot realize the full-quantitative treatment of the hot casting slag.
Disclosure of Invention
1. Problems to be solved
Aiming at the problem of low recovery rate of the thermal state casting slag in the prior art, the invention provides a thermal state casting slag recovery processing device, which can improve the recovery rate of the thermal state casting slag.
The invention also aims to provide a method for recycling the hot casting residue.
Another object of the present invention is to provide a hot casting slag recycling application.
2. Technical scheme
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the invention relates to a thermal state casting residue recovery processing device, which is arranged below a continuous casting ladle and comprises:
the bottom of the slag tank at the slag receiving position is paved with a layer of steel slag tailings, the granularity of the steel slag tailings is 5-50mm, the water content is less than 1%, and the paving thickness of the steel slag tailings is 300-350mm, so that the phenomenon that the liquid casting residues are directly contacted with the bottom of the casting residue tank to cause the liquid casting residues to be bonded with the bottom of the slag tank is avoided; a grating is arranged in the slag pot and divides the slag pot into a plurality of spaces; the inner wall of the slag pot is sprayed with high-temperature resistant anti-bonding coating, such as high-temperature inorganic anti-bonding coating, and the spraying thickness is not less than 1 mm;
the tank holding trolley is arranged on one side of the slag tank, can convey the slag tank to a casting residue treatment site, and pours out casting residues in the slag tank;
the hoisting mechanism is provided with a steel hopper and can convey the casting residues with the temperature of 800-.
In one possible embodiment of the invention, the grid has a size of 400mm × 400 mm.
In a possible embodiment of the invention, the material of the grid is concrete, cast iron or steel.
The invention also provides a thermal state casting residue recovery processing method, which comprises the following steps:
step S101, slag pot preparation
A grating is arranged in the slag pot and divides the slag pot into a plurality of spaces; laying a layer of steel slag tailings at the bottom of the slag tank, wherein the granularity of the steel slag tailings is 5-50mm, the water content of the steel slag tailings is less than 1%, and the thickness of the steel slag tailings is 300-350 mm; the inner wall of the slag pot is sprayed with high-temperature-resistant anti-sticking coating, and the thickness of the coating is not less than 1 mm;
step S102, receiving casting slag
Pouring the casting slag in the continuous casting ladle into a slag tank provided with a grid, wherein the temperature of the casting slag is 1500-1600 ℃, and when the casting slag is poured into the slag tank, the slag pouring speed is not more than 2t/min, so that the splashing of the liquid casting slag is prevented, and the influence of the too fast pouring of the slag on the quality of the grid is avoided. Stopping pouring the casting slag when the distance between the liquid level of the casting slag and the top of the grating is 200-300mm so as to ensure the segmentation effect of the grating on the casting slag;
step S103, transferring the casting residue
After the slag tank receives the casting slag, the slag tank is transported to a casting slag treatment site from a casting slag receiving position through a tank holding trolley, and the transport time is controlled within 60 min; when the tank holding trolley is used for turning over slag, the temperature is controlled to be more than 1000 ℃, and the height difference between a slag turning position and a treatment site is more than 5m, so that the crushing effect of the cast slag after the tank is turned over is ensured, and the hot cast slag steel can be conveniently and rapidly returned to a converter for utilization;
step S104, the casting residue is returned to the furnace
Screening the casting slag steel which is crushed into small blocks, and then loading the casting slag steel with the grain size meeting the use requirement of the converter and the temperature of 800-900 ℃ into a steel hopper and transferring the casting slag steel into the converter.
In a possible embodiment of the invention, the grain size of the cast slag steel is less than 400mm x 500 mm.
In one possible embodiment of the invention, the addition amount of the hot-state casting residue steel converter is 20-100 kg/t steel.
In a possible embodiment of the invention, the total operating time of the casting residue returned to the converter is controlled within 120 min.
The invention also provides a method for recycling the thermal state casting residue, wherein the thermal state casting residue and the scrap steel obtained by the method are mixed according to the following ratio of 1: (1-7) charging into a converter. According to the heat balance principle, the cooling effect of the hot-state casting residue added into the converter is measured and calculated, wherein the cooling effect is 1 ℃/ton and is about 0.2 time of that of the cold material of the scrap steel. The reasonable proportion range of the hot-state casting slag and the cold material of the steel scrap is controlled, the heat of the hot-state casting slag is effectively utilized, the consumption of the steel scrap of the converter can be increased, and the energy conservation and the carbon reduction are facilitated.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the thermal state casting residue recovery processing device, the thermal state casting residue is divided into a plurality of small blocks for recovery and reuse, the recovery rate is 100%, and the recovery rate of the thermal state casting residue is effectively improved;
(2) according to the thermal state casting residue recovery processing device, the thermal state casting residue is crushed by the grille to obtain the casting residue steel with the grain size of less than 400mm multiplied by 500mm and the temperature of more than 800 ℃, and the thermal state charging is realized through reasonable field process arrangement, and sensible heat resources are effectively recovered while the casting residue steel is recovered;
(3) according to the thermal state casting residue recovery processing device, 1t of thermal state casting residue steel with the temperature of more than 800 ℃ is added into each converter, about 0.5t of common normal temperature steel scrap can be consumed, and the utilization ratio of the converter steel scrap is effectively improved; meets the requirements of relevant national energy-saving and environment-friendly policies, and is beneficial to reducing carbon emission.
Drawings
The technical solution of the present invention will be described in further detail with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for illustrative purposes only and thus are not intended to limit the scope of the present invention. Furthermore, unless otherwise indicated, the drawings are intended to be illustrative of the structural configurations described herein and are not necessarily drawn to scale.
FIG. 1 is a schematic structural view of a hot-state casting slag recycling device according to the present invention;
FIG. 2 is a schematic structural view of a slag pot of the thermal state casting slag recycling device of the invention;
FIG. 3 is a flow chart of the hot-state casting slag recycling method of the present invention.
Description of the drawings:
11. a slag pot; 12. steel slag tailings; 13. a grid; 14. a tank holding trolley; 15. a steel bucket.
Detailed Description
The following detailed description of exemplary embodiments of the invention refers to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration exemplary embodiments in which the invention may be practiced. Although these exemplary embodiments are described in sufficient detail to enable those skilled in the art to practice the invention, it should be understood that other embodiments may be realized and that various changes to the invention may be made without departing from the spirit and scope of the present invention. The following more detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is presented for purposes of illustration only and not limitation to describe the features and characteristics of the invention, to set forth the best mode of carrying out the invention, and to sufficiently enable one skilled in the art to practice the invention. Accordingly, the scope of the invention is to be limited only by the following claims.
Example 1
Taking a 300t converter as an example, the specific operation steps are as follows:
(1) firstly, the assembled concrete grid is installed to 5.3m 3 In a slag pot; then, filling the steel slag tailings with the particle size of 10-40 mm and the water content of 0.8% into the bottom of a bedding slag tank of the slag tank, wherein the thickness of a material layer is about 300 mm; then spraying high-temperature-resistant anti-bonding coating on the inner wall of the slag pot, wherein the spraying thickness is 1 mm; finally, conveying the slag tank to a continuous casting bridging slag position by using a tank holding vehicle;
(2) pouring the residual casting slag in the ladle after the continuous casting is finished into a slag tank, controlling the slag pouring speed to be about 1t/min, and finishing slag receiving of the slag tank when the liquid level of the casting slag is about 300mm away from the top of the grid;
(3) the slag pot filled with the casting slag is transported to a casting slag treatment site by a slag ladle car, the casting slag in the slag pot is poured out, the distance between the slag pot and the ground is about 5.5m when the slag is poured, the casting slag steel with the grain diameter meeting the use requirement of the converter is filled into a steel scrap hopper by a steel grab, the casting slag steel enters the converter through the steel scrap hopper for utilization, and the temperature of the casting slag is about 850 ℃.
According to the technical requirements of the LF furnace, the addition amount of the thermal state casting residue slag steel is about 10t, the addition amount of other normal temperature waste steel is 40t, and the normal temperature waste steel is utilized for about 5t more than that when the thermal state casting residue slag steel is not added.
Example 2
Taking a 300t converter as an example, the specific operation steps are as follows:
(1) firstly, mounting the assembled concrete grid into a slag tank of 5.3m 3; then, filling the steel slag tailings with the particle size of 5-45 mm and the water content of 0.6% into the bottom of a bedding slag tank of the slag tank, wherein the thickness of a material layer is about 280 mm; then spraying high-temperature-resistant anti-bonding coating on the inner wall of the slag pot, wherein the spraying thickness is 1 mm; and finally, conveying the slag tank to a continuous casting bridging slag position by using a tank carrying vehicle.
(2) And pouring the residual casting slag in the ladle after the continuous casting is finished into a slag tank, controlling the slag pouring speed to be about 1.5t/min, and finishing the slag receiving of the slag tank when the liquid level of the casting slag is about 300mm away from the top of the grid.
(3) The slag pot filled with the casting slag is transported to a casting slag treatment site by adopting a slag pot carrier, the casting slag in the slag pot is poured out, the distance between the slag pot and the ground is about 5m when the slag is poured, the casting slag steel with the grain diameter meeting the use requirement of the converter is filled into a waste steel hopper by adopting a steel grab, the casting slag steel enters the converter through the waste steel hopper for utilization, and the temperature of the casting slag is about 900 ℃. According to the technical requirements of the RH furnace, the adding amount of the hot-state casting residue steel is about 8t, the adding amount of other normal-temperature waste steel is 41t, and the normal-temperature waste steel is about 4t more than that when the hot-state casting residue steel is not added.
Comparative example 1
Taking a 300t converter as an example, the specific operation steps are as follows:
(1) firstly, mounting the assembled concrete grid into a slag tank of 5.3m 3; then, filling the steel slag tailings with the particle size of 5-20 mm into the bottom of a slag tank bedding slag tank, wherein the thickness of a material layer is about 300 mm; then spraying high-temperature-resistant anti-sticking coating on the inner wall of the slag pot, wherein the spraying thickness is 1 mm; and finally, conveying the slag tank to a continuous casting bridging slag position by using a tank holding vehicle.
(2) And pouring the residual casting slag in the ladle after the continuous casting is finished into a slag tank, controlling the slag pouring speed to be about 1t/min, and finishing slag receiving of the slag tank when the liquid level of the casting slag is about 300mm away from the top of the grating.
(3) Transporting the slag tank filled with casting slag to a casting slag treatment site by using a tank truck, pouring the casting slag in the slag tank, cooling the casting slag steel by pumping water at the temperature of about 100 ℃, transporting the casting slag steel to a converter scrap room, and adding the casting slag steel and normal-temperature scrap steel into a converter for use. According to the technical requirements of the LF furnace, the addition amount of the casting residue slag steel is about 10t, the addition amount of other normal-temperature waste steel is 35t, and the normal-temperature waste steel is less utilized by about 5t than when the thermal-state casting residue slag steel is added.
Comparative example 2
Taking a 300t converter as an example, the specific operation steps are as follows:
(1) firstly, mounting the assembled concrete grid into a slag pot of 5.3m 3; then, filling the steel slag tailings with the particle size of 5-20 mm into the bottom of a slag tank bedding slag tank, wherein the thickness of a material layer is about 300 mm; then spraying high-temperature-resistant anti-bonding coating on the inner wall of the slag pot, wherein the spraying thickness is 1 mm; and finally, conveying the slag tank to a continuous casting bridging slag position by using a tank holding vehicle.
(2) And pouring the residual casting slag in the ladle after the continuous casting is finished into a slag tank, controlling the slag pouring speed to be about 1t/min, and finishing slag receiving of the slag tank when the liquid level of the casting slag is about 300mm away from the top of the grating.
(3) Transporting the slag tank filled with casting slag to a casting slag treatment site by using a tank truck, pouring the casting slag in the slag tank, cooling the casting slag steel by pumping water at the temperature of about 100 ℃, transporting the casting slag steel to a converter scrap room, and adding the casting slag steel and normal-temperature scrap steel into a converter for use. According to the technical requirements of the RH furnace, the addition amount of the casting residue slag steel is about 8t, the addition amount of other normal-temperature waste steel is 37t, and the normal-temperature waste steel is less utilized by about 4t than when the hot casting residue slag steel is added.
Claims (10)
1. The utility model provides a hot state casting residue recovery processing device, sets up in continuous casting ladle below, its characterized in that includes:
the bottom of the slag tank (11) positioned at the slag receiving position is paved with a layer of steel slag tailings (12), the granularity of the steel slag tailings (12) is 5-50mm, the water content is less than 1%, and the thickness is 300-350 mm; a grating (13) is arranged in the slag pot (11), and the grating (13) divides the slag pot (11) into a plurality of spaces; the inner wall of the slag pot (11) is sprayed with a high-temperature resistant anti-sticking coating, and the thickness of the coating is not less than 1 mm;
the tank holding trolley (14) is arranged on one side of the slag tank (11), and can be used for transferring the slag tank (11) to a cast slag treatment site and pouring out cast slag in the slag tank (11);
the hoisting mechanism is provided with a steel hopper (15) and can send the casting residues with the temperature of 800-900 ℃ into the converter.
2. The hot cast slag recycling apparatus according to claim 1, wherein the grid (13) has a size of 400mm x 400 mm.
3. The hot-state casting residue recycling device according to claim 2, wherein the material of the grating (13) is concrete, cast iron or steel.
4. A method for recycling hot-state casting slag is characterized by comprising the following specific steps:
step S101, preparation of slag pot (11)
A grating (13) is configured in the slag pot (11), and the grating (13) divides the slag pot (11) into a plurality of spaces; paving a layer of steel slag tailings (12) at the bottom of the slag tank (11), wherein the granularity of the steel slag tailings (12) is 5-50mm, the water content is less than 1%, and the thickness is 300-350 mm; the inner wall of the slag pot (11) is sprayed with high-temperature-resistant anti-sticking coating, and the thickness of the coating is not less than 1 mm;
step S102, receiving casting slag
Pouring the casting slag in the continuous casting ladle into a slag tank (11) provided with a grid (13), wherein the temperature of the casting slag is 1500-;
step S103, transferring the casting residue
After the slag tank (11) receives the casting slag, the slag tank (11) is transported to a casting slag treatment site from a casting slag receiving position through a tank holding trolley (14), and the transport time is controlled within 60 min; when the tank holding trolley (14) turns over slag, the temperature is controlled to be above 1000 ℃, and the height difference between the slag turning position and the treatment site is above 5 m;
step S104, returning the casting residue to the converter
Screening the casting slag steel which is crushed into small blocks, then loading the casting slag steel with the grain diameter meeting the use requirement of the converter and the temperature of 800-900 ℃ into a steel hopper (15) and transferring the casting slag steel into the converter.
5. The method for recycling hot casting slag according to claim 4, wherein the grain size of the casting slag steel is less than 400mm x 500 mm.
6. The hot-state casting slag recycling method according to claim 5, wherein the amount of the hot-state casting slag steel added to the converter is 20-100 kg/t steel.
7. The method for recycling hot casting slag according to claim 6, wherein the size of the grid (13) is 400mm x 400 mm.
8. The method for recycling hot casting slag according to claim 7, wherein the material of the grid (13) is concrete, cast iron or steel.
9. The method according to claim 8, wherein the total operating time of the molten cast slag in the converter is controlled to be within 120 min.
10. A method for recycling hot casting slag and scrap steel obtained by the method for recycling hot casting slag according to any one of claims 4 to 9, wherein the ratio of hot casting slag to scrap steel is 1: (1-7) charging into a converter.
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|---|---|---|---|---|
| JPH05179318A (en) * | 1991-12-28 | 1993-07-20 | Hamada Juko Kk | Treatment of steel slag and treating equipment for steel slag |
| CN101054607A (en) * | 2006-04-10 | 2007-10-17 | 上海宝钢冶金建设公司 | Processing technique for steel smelting casting residue |
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