CN113149495A - By using CO-containing gas2Device and method for pretreating steel slag by tail gas air quenching - Google Patents
By using CO-containing gas2Device and method for pretreating steel slag by tail gas air quenching Download PDFInfo
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- CN113149495A CN113149495A CN202110578121.4A CN202110578121A CN113149495A CN 113149495 A CN113149495 A CN 113149495A CN 202110578121 A CN202110578121 A CN 202110578121A CN 113149495 A CN113149495 A CN 113149495A
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- steel slag
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- 239000002893 slag Substances 0.000 title claims abstract description 127
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 104
- 239000010959 steel Substances 0.000 title claims abstract description 104
- 238000010791 quenching Methods 0.000 title claims abstract description 80
- 230000000171 quenching effect Effects 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000007789 gas Substances 0.000 claims abstract description 36
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000003546 flue gas Substances 0.000 claims abstract description 13
- 239000002699 waste material Substances 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 239000002918 waste heat Substances 0.000 claims abstract description 10
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000000292 calcium oxide Substances 0.000 claims abstract description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 238000002844 melting Methods 0.000 claims abstract description 5
- 230000008018 melting Effects 0.000 claims abstract description 5
- 238000010248 power generation Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 6
- 238000003763 carbonization Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 3
- 239000003595 mist Substances 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims description 2
- 239000000779 smoke Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B5/00—Treatment of metallurgical slag ; Artificial stone from molten metallurgical slag
-
- 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
- C21B3/08—Cooling slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a device and a method for pre-treating steel slag by using CO 2-containing tail gas through air quenching, wherein the device comprises a steel slag groove and an air quenching device, the steel slag groove is a square groove, the middle part inside the steel slag groove is provided with a grating plate, the grating plate is obliquely arranged, the middle part of the side wall of the steel slag groove, which is far away from the air quenching device, is fixedly connected with a waste slag chamber, and a discharge hole at the bottom end of the steel slag groove is fixedly connected with a conveying pipe, and the beneficial effects of the invention comprise that: the steel slag obtained by the manufacturing method has low content of free calcium oxide of about 100 ℃, has good stability, can well realize high-efficiency pretreatment of the steel slag, greatly improves the subsequent resource utilization rate, removes waste heat power generation for waste heat recovery after high-temperature flue gas at the outlet of a cyclone separator air duct is discharged from a flue gas port, improves the heat energy utilization rate, and can heat a steel slag tank if necessary by installing a heater at the bottom of the steel slag tank, wherein the heating temperature of the heater is higher than the melting temperature of the steel slag, thereby ensuring that the steel slag is in a liquid state.
Description
Technical Field
The invention relates to the field of steel slag recycling methods, in particular to a device and a method for pre-treating steel slag by using CO 2-containing tail gas through air quenching.
Background
The utilization of steel slag mainly includes the production of steel slag powder as concrete admixture, the production of steel slag cement, the production of silicate cement blending and clinker in cement plant, the production of brick and road material by steel slag, and the return of partial casting residue to sintering blending for use. The steel slag used as building material or road steel slag is required to have good stability and lower metallic iron content so as to prevent safety and quality problems in the engineering using the steel slag.
In the prior art, steel slag which meets the stability requirement and has good activity cannot be obtained at one time by steel slag pretreatment processes such as a hot splashing method, a hot stuffiness method, a water quenching method, an air quenching method, a roller method, a granulating wheel method and the like, so that large-scale resource utilization of the steel slag is limited.
Disclosure of Invention
The invention aims to provide a device and a method for pre-treating steel slag by using CO 2-containing tail gas through air quenching, so as to solve the problems that the steel slag pre-treatment process provided in the background art cannot obtain the steel slag which meets the stability requirement and has good activity at one time, and the large-scale resource utilization of the steel slag is limited.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an utilize device that contains CO2 tail gas air quenching preliminary treatment slag, includes slag chute and air quenching ware, the slag chute is square groove, the inside middle part in slag chute is provided with the grid board, the grid board slope sets up, the lateral wall middle part fixedly connected with waste slag room of air quenching ware is kept away from in the slag chute, the bottom discharge gate fixedly connected with conveyer pipe in slag chute, the lower extreme fixed connection in one side middle part of air quenching ware of conveyer pipe, the tuyere is installed to the inside middle and lower place of air quenching ware, the export wind speed of tuyere is 40 to 60 meters per second, tuyere spun gas is the industry tail gas that contains CO2 concentration 25 to 40%, one side lower part surface that the conveyer pipe was kept away from to the air quenching ware is seted up the air intake corresponding to the tuyere, the inside mid-mounting of air quenching ware has the steam nozzle, the top middle part fixedly connected with conveying pipeline of air quenching ware, the one end fixedly connected with cyclone that the air quenching ware was kept away from to the conveying pipeline, the middle of the bottom end of the cyclone separator is fixedly connected with a blanking pipe, and the lower end of the blanking pipe is fixedly connected with a grate cooler.
Preferably, the inlet end of the waste residue chamber is opposite to the grid plate, the aperture of the grid plate is a square hole with the diameter of 30-100 mm, and the inclination angle of the grid plate is 30-60 degrees.
Preferably, the water vapor nozzle is arranged above the air nozzle and is a three-layer high-speed water mist sprayer.
Preferably, one side of the upper end of the grate cooler close to the air quenching device is fixedly connected with an air return pipe, and one end of the air return pipe far away from the grate cooler is fixedly connected to the side wall of the middle part of the air quenching device.
Preferably, the middle part of the upper end of the cyclone separator is fixedly connected with a smoke port.
Preferably, a heater is installed at the bottom of the steel slag groove, and the heating temperature of the heater of the steel slag groove is higher than the melting temperature of the steel slag.
Preferably, the treatment method of the device for pre-treating the steel slag by using the air quenching of the tail gas containing CO2 comprises the following specific steps:
t1, pouring liquid steel slag into a steel slag groove with a grating plate with a large inclination angle, blocking the steel slag with poor fluidity and high viscosity by the grating plate or rolling the steel slag into a waste slag chamber along the grating plate, and allowing the steel slag with good fluidity to flow into a storage area at the lower part of the steel slag groove after passing through the grating plate;
t2: steel slag with good fluidity in a storage area at the lower part of the steel slag groove enters the air quenching device through the chute and the conveying pipe;
t3: the gas sprayed out of the air nozzle at the bottom of the air quenching device is industrial tail gas containing 25-40% of CO2, and the liquid steel slag entering the air quenching device is subjected to air quenching cutting, cooling, solidifying and granulating by the high-speed CO2 tail gas sprayed out of the air nozzle at the bottom of the air quenching device;
t4: high-temperature steel slag particles formed by air quenching are carried to the middle part of the air quenching device by gas, and enter a cyclone separator for solid-gas separation after contacting with high-speed water vapor sprayed by a water vapor nozzle for a certain stroke;
t5: high-temperature steel slag collected by solids at the cone part of the cyclone separator enters a grate cooler for secondary cooling and carbonization, and cooling air at the front end of the grate cooler enters the middle part of an air quenching device and is used as material carrying air of the air quenching device;
t6: after high-temperature flue gas at the outlet of the air pipe of the cyclone separator is discharged, waste heat is removed for power generation to recover waste heat, and the flue gas is exhausted after reaching the standard after dust removal;
t7: the steel slag with low free calcium oxide and magnesium oxide content at the temperature of about 100 ℃ is obtained at the outlet of the grate cooler.
Compared with the prior art, the invention has the beneficial effects that:
1. the steel slag obtained by the preparation method has low content of free calcium oxide at about 100 ℃, has good stability, can well realize high-efficiency pretreatment of the steel slag, and greatly improves the subsequent recycling utilization rate of the steel slag.
2. After high-temperature flue gas at the outlet of the air pipe of the cyclone separator is discharged from the flue gas port, waste heat power generation is carried out to recover waste heat, and the heat energy utilization rate is improved.
3. The heater is arranged at the bottom of the steel slag groove, the heating temperature of the heater is higher than the melting temperature of the steel slag, and the steel slag groove can be heated if necessary, so that the steel slag is ensured to be in a liquid state.
Drawings
FIG. 1 is a schematic front view of the present invention;
FIG. 2 is a schematic structural view of a steel slag bath according to the present invention;
fig. 3 is a schematic structural view of the air quenching device of the present invention.
In the figure: 1. a steel slag groove; 2. a wind quenching device; 3. a grid plate; 4. a delivery pipe; 5. a tuyere; 6. a water vapor nozzle; 7. a delivery pipe; 8. a cyclone separator; 9. a discharging pipe; 10. a grate cooler; 11. a flue gas port; 12. a return air duct; 13. an air inlet; 14. a waste slag chamber.
Detailed Description
In order to solve the problem, the device and the method for pre-treating the steel slag by using the CO 2-containing tail gas through air quenching are particularly provided. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Referring to fig. 1-3, the present embodiment provides a device and a method for pre-treating steel slag by using CO 2-containing tail gas through air quenching, including a steel slag tank 1 and an air quenching device 2, wherein the steel slag tank 1 is a square tank, a grating plate 3 is disposed in the middle of the interior of the steel slag tank 1, a waste slag chamber 14 is fixedly connected to the middle of the side wall of the steel slag tank 1 away from the air quenching device 2, liquid steel slag is poured into the steel slag tank 1 with the grating plate 3 having a large inclination angle and rolls down to the waste slag chamber 14, a delivery pipe 4 is fixedly connected to a bottom discharge port of the steel slag tank 1, the lower end of the delivery pipe 4 is fixedly connected to the middle of one side of the air quenching device 2, an air inlet 13 is disposed on the surface of the lower portion of one side of the air quenching device 2 away from the delivery pipe 4, the steel slag can enter the air quenching device 2 through the delivery pipe 4, a delivery pipe 7 is fixedly, the steel slag particles in the air quenching device 2 are carried by gas and enter the cyclone separator 8 for solid-gas separation, the middle part of the bottom end of the cyclone separator 8 is fixedly connected with the blanking pipe 9, the lower end of the blanking pipe 9 is fixedly connected with the grate cooler 10, and high-temperature steel slag collected by the solid on the conical part of the cyclone separator 8 enters the grate cooler 10 for secondary cooling and carbonization.
Specifically, when the slag quenching device is used, liquid steel slag is poured into a steel slag groove 1 with a grating plate 3 with a large inclination angle, a heater is arranged at the bottom of the steel slag groove 1, the heating temperature of the heater of the steel slag groove 1 is higher than the melting temperature of the steel slag, the steel slag groove 1 can be heated if necessary to ensure that the steel slag is liquid, the inlet end of a waste slag chamber 14 is opposite to the grating plate 3, the aperture of the grating plate 3 is a square hole of 30-100 mm, the inclination angle of the grating plate 3 is 30-60 degrees, the steel slag with poor fluidity and high viscosity is blocked by the grating plate 3 or falls into the waste slag chamber 14 along the grating plate 3, the steel slag with good fluidity flows into a storage area at the lower part of the steel slag groove 1 after passing through the grating plate 3, and then the steel slag with good fluidity in the storage area at the lower part of the steel slag groove 1 enters an air quenching device 2 through a conveying pipe 4 through a chute;
the gas sprayed out of a tuyere 5 at the bottom of the air quenching device 2 is industrial tail gas containing 25-40% of CO2, the liquid steel slag entering the air quenching device 2 is subjected to air quenching cutting and cooling solidification granulation by high-speed CO2 tail gas sprayed out of the tuyere 5 at the bottom of the air quenching device 2, a water vapor nozzle 6 is arranged above the tuyere 5, the water vapor nozzle 6 is a three-layer high-speed water mist sprayer, high-temperature steel slag particles formed by air quenching are carried to the middle part of the air quenching device 2 by the gas, and enter a cyclone separator 8 for solid-gas separation after contacting with high-speed water vapor sprayed out of the water vapor nozzle 6 for a section of stroke;
high-temperature steel slag collected by solids at the conical part of the cyclone separator 8 enters a grate cooler 10 for secondary cooling and carbonization, one side of the upper end of the grate cooler 10 close to the air quenching device 2 is fixedly connected with an air return pipe 12, one end of the air return pipe 12 far away from the grate cooler 10 is fixedly connected with the side wall of the middle part of the air quenching device 2, and cooling air at the front end of the grate cooler 10 enters the middle part of the air quenching device 2 through the air return pipe 12 and is used as material carrying air of the air quenching device 2;
the middle part of the upper end of the cyclone separator 8 is fixedly connected with a flue gas port 11, after high-temperature flue gas at the outlet of an air pipe of the cyclone separator 8 is discharged from the flue gas port 11, waste heat power generation is carried out for waste heat recovery, the flue gas is exhausted after reaching the standard after dust removal, and the steel slag with low free calcium oxide and magnesium oxide content at about 100 ℃ is obtained at the outlet of the grate cooler 10.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides an utilize device that contains CO2 tail gas air quenching preliminary treatment slag, includes slag chute (1) and air quenching ware (2), its characterized in that, slag chute (1) is square groove, the inside middle part of slag chute (1) is provided with grid plate (3), grid plate (3) slope sets up, slag chute (1) is kept away from the lateral wall middle part fixedly connected with waste slag room (14) of air quenching ware (2), the bottom discharge gate fixedly connected with conveyer pipe (4) of slag chute (1), the lower extreme fixed connection of conveyer pipe (4) is in one side middle part of air quenching ware (2), tuyere (5) are installed to the inside middle and below of air quenching ware (2), the outlet air speed of tuyere (5) is 40 to 60 meters per second, the gas of tuyere (5) spun is 25 to 40% of the industrial tail gas that contains CO2 concentration, one side lower part surface that air quenching ware (2) kept away from air quenching ware (4) corresponds tuyere (5) and has seted up air intake (13), the air quenching device is characterized in that a water vapor nozzle (6) is installed in the middle of the interior of the air quenching device (2), a conveying pipe (7) is fixedly connected to the middle of the top end of the air quenching device (2), one end, far away from the air quenching device (2), of the conveying pipe (7) is fixedly connected with a cyclone separator (8), a blanking pipe (9) is fixedly connected to the middle of the bottom end of the cyclone separator (8), and a grate cooler (10) is fixedly connected to the lower end of the blanking pipe (9).
2. The device for pre-treating steel slag by using CO 2-containing tail gas through air quenching as claimed in claim 1, wherein: the inlet end of the waste residue chamber (14) is opposite to the grid plate (3), the aperture of the grid plate (3) is a square hole with the diameter of 30-100 mm, and the inclination angle of the grid plate (3) is 30-60 degrees.
3. The device for pre-treating steel slag by using CO 2-containing tail gas through air quenching as claimed in claim 1, wherein: the steam nozzle (6) is arranged above the air nozzle (5), and the steam nozzle (6) is a three-layer high-speed water mist sprayer.
4. The device for pre-treating steel slag by using CO 2-containing tail gas through air quenching as claimed in claim 1, wherein: and one side, close to the air quenching device (2), of the upper end of the grate cooler (10) is fixedly connected with an air return pipe (12), and one end, far away from the grate cooler (10), of the air return pipe (12) is fixedly connected to the side wall of the middle part of the air quenching device (2).
5. The device for pre-treating steel slag by using CO 2-containing tail gas through air quenching as claimed in claim 1, wherein: the middle part of the upper end of the cyclone separator (8) is fixedly connected with a smoke port (11).
6. The device for pre-treating steel slag by using CO 2-containing tail gas through air quenching as claimed in claim 1, wherein: the heater is installed at the bottom of the steel slag groove (1), and the heating temperature of the heater of the steel slag groove (1) is higher than the melting temperature of steel slag.
7. The treatment method of the device for the wind quenching pretreatment of the steel slag by using the CO 2-containing tail gas as claimed in claim 1 is characterized by comprising the following steps:
t1, pouring liquid steel slag into the steel slag groove (1) with the grid plate (3) with a large inclination angle, blocking the steel slag with poor fluidity and high viscosity by the grid plate (3) or rolling the steel slag along the grid plate (3) to the waste slag chamber (14), and enabling the steel slag with good fluidity to flow into a storage area at the lower part of the steel slag groove (1) after passing through the grid plate (3);
t2: steel slag with good fluidity in a storage area at the lower part of the steel slag groove (1) enters the air quenching device (2) through a chute and a conveying pipe (4);
t3: the gas sprayed out of the air nozzle (5) at the bottom of the air quenching device (2) is industrial tail gas containing 25-40% of CO2, and the liquid steel slag entering the air quenching device (2) is subjected to air quenching cutting, cooling, solidifying and granulating by the high-speed CO2 tail gas sprayed out of the air nozzle (5) at the bottom of the air quenching device (2);
t4: high-temperature steel slag particles formed by air quenching are carried to the middle part of the air quenching device (2) by gas, and enter a cyclone separator (8) for solid-gas separation after contacting with high-speed water vapor sprayed by a water vapor nozzle (6) for a certain stroke;
t5: high-temperature steel slag collected by the solid on the conical part of the cyclone separator (8) enters a grate cooler (10) for secondary cooling and carbonization, and cooling air at the front end of the grate cooler (10) enters the middle part of the air quenching device (2) and is used as material carrying air of the air quenching device (2);
t6: after high-temperature flue gas at the outlet of the air pipe of the cyclone separator (8) is discharged, waste heat is removed for power generation to recover waste heat, and the flue gas is exhausted after reaching the standard after dust removal;
t7: the steel slag with low free calcium oxide and magnesium oxide content at about 100 ℃ is obtained at the outlet of the grate cooler (10).
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| CN202110578121.4A CN113149495A (en) | 2021-05-26 | 2021-05-26 | By using CO-containing gas2Device and method for pretreating steel slag by tail gas air quenching |
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| CN202110578121.4A CN113149495A (en) | 2021-05-26 | 2021-05-26 | By using CO-containing gas2Device and method for pretreating steel slag by tail gas air quenching |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114890691A (en) * | 2022-05-09 | 2022-08-12 | 山东大学 | Converter slag flue gas quenching carbon fixation heat recovery device and method |
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| KR20020050429A (en) * | 2000-12-21 | 2002-06-27 | 이구택 | A pretreatment method of steel slag by using carbon dioxide |
| CN101475999A (en) * | 2009-01-16 | 2009-07-08 | 首钢总公司 | Rapid stabilizing method for thermal state massive steel slag |
| CN103131805A (en) * | 2011-11-25 | 2013-06-05 | 扬州科光技术发展有限公司 | Novel steel slag pelletization device |
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