CN114045368B - Continuous steel slag heat stewing system and treatment method thereof - Google Patents
Continuous steel slag heat stewing system and treatment method thereof Download PDFInfo
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- CN114045368B CN114045368B CN202111624875.5A CN202111624875A CN114045368B CN 114045368 B CN114045368 B CN 114045368B CN 202111624875 A CN202111624875 A CN 202111624875A CN 114045368 B CN114045368 B CN 114045368B
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- 239000002893 slag Substances 0.000 title claims abstract description 163
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 161
- 239000010959 steel Substances 0.000 title claims abstract description 161
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000000463 material Substances 0.000 claims abstract description 30
- 239000000428 dust Substances 0.000 claims abstract description 26
- 238000007599 discharging Methods 0.000 claims abstract description 25
- 238000009826 distribution Methods 0.000 claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims description 22
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 15
- 239000003546 flue gas Substances 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 11
- 239000000109 continuous material Substances 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 3
- 238000007781 pre-processing Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims 1
- 239000000292 calcium oxide Substances 0.000 abstract description 12
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract description 12
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000010298 pulverizing process Methods 0.000 abstract description 4
- 238000005192 partition Methods 0.000 abstract description 2
- 238000000354 decomposition reaction Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 4
- 239000000395 magnesium oxide Substances 0.000 description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 238000007885 magnetic separation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000003595 mist Substances 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
- 230000001737 promoting effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000007281 self degradation Effects 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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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
-
- 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
- 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
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
-
- 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
- C21B2400/066—Receptacle features where the slag is treated
- C21B2400/068—Receptacle features where the slag is treated with a sealed or controlled environment
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a continuous steel slag braising system and a treatment method thereof, comprising a steel slag crushing device; the continuous thermal stewing device sequentially passes through a material distribution area, a cooling area, a thermal stewing area, a cooling area and a discharging area to obtain qualified thermal stewing steel slag, wherein partition plates are respectively arranged between the areas; dust removal device. According to the continuous steel slag stewing system provided by the embodiment of the invention, the hot steel slag is crushed to be less than 280mm by the steel slag crushing device, then the crushed hot steel slag is uniformly arranged in the continuous stewing device, and continuous stewing is carried out at a specific temperature system, so that the rapid stewing decomposition of the steel slag can be realized, and the thermally stewed steel slag with higher pulverization rate, lower free calcium oxide and lower water content is obtained. Under the condition of ensuring clean production, the system has the advantages of high equipment and automation degree, less labor and personnel, and low operation cost.
Description
Technical Field
The invention relates to the field of metallurgy energy conservation and environmental protection, in particular to a continuous steel slag heat stewing system and a treatment method thereof.
Background
Steel slag is a main solid waste produced in steelmaking, the steel enterprises rapidly develop in recent years, the production amount of the steel slag is increased, the national coarse steel yield in 2015 is 8.04 hundred million t, and the production amount of the steel slag is about 1 hundred million t. At present, the utilization rate of the steel slag in China is low and is only 20 percent. A large amount of steel slag is piled, a large amount of land is occupied, and the environment is polluted. The method for treating the steel slag by the iron and steel enterprises in China comprises the following steps: hot splashing, hot disintegrating, shallow tray, water quenching, wind quenching, granulating and rolling. Among them, the hot-disintegrating method is attracting more and more attention.
The hot stewing process is to pour hot molten steel slag directly into a hot stewing slag pool, cool the steel slag to below 800 ℃ with water, cover and spray water mist, and react the steel slag with water. Because the steel slag contains free calcium oxide, the steel slag is hydrated with calcium hydroxide and swells, thus promoting the cracking and pulverization of the steel slag. At present, a hot disintegrating pit is mainly used for hot disintegrating steel slag in China, and the main technological process comprises the following five steps: (1) primary cooling of steel slag; (2) pouring the steel slag into a hot stuffy pit; (3) capping water spraying and hot sealing; (4) excavating slag by an excavator; (5) loading and transporting. This process has the following disadvantages: ① The hot-sealing time is long, and the primary hot-sealing generally needs 12 hours; ② Intermittent heat stewing has low automation degree, more labor and high production cost; ③ The steam and dust are large in the slag digging process, and the environment is polluted.
Disclosure of Invention
The invention designs a continuous thermal stewing system capable of realizing continuous thermal stewing, short thermal stewing time, high automation degree, less labor and personnel, clean production of steel slag and a use method thereof, aiming at overcoming the defects of the prior art.
The invention provides a continuous steel slag braising system, which comprises:
The steel slag crushing device is used for preprocessing the hot steel slag to form block-shaped steel slag below 280 mm.
A continuous heat-stewing device which receives the steel slag in a block shape below 280mm and continuously heat-stews the steel slag into heat-stewed steel slag (75% below 20 mm), and the continuous heat-stewing device comprises:
The material distribution area is provided with continuous and uniform material distribution equipment, and steel slag is uniformly arranged in the continuous heat stewing device;
the cooling area is used for cooling the evenly arranged steel slag to the heat stewing reaction temperature;
the thermal stewing zone is used for conducting thermal stewing on the cooled steel slag at a heat preservation temperature;
the cooling zone is used for rapidly cooling the steel slag after being thermally stewed to reach the discharging temperature;
And the material distribution area is provided with a continuous material outlet device to realize continuous material outlet of the steel slag.
The dust removing device is used for carrying out centralized purification treatment on dust-containing flue gas generated in the process, and the dust-containing flue gas reaches the flue gas emission standard.
In addition, the continuous steel slag braising system according to the invention can also have the following additional technical characteristics:
Preferably, the continuous thermal braising structure is a closed annular structure, comprising: the device comprises an annular shell, a rotatable annular furnace bottom, a water seal structure and a transmission device. The annular shell covers the rotatable annular furnace bottom to form an annular cavity, and a water seal structure is adopted between the annular shell and the rotatable annular furnace bottom to seal the annular cavity, so that gas overflow is prevented. The annular structure is provided with a material distribution area, a cooling area, a braising area, a cooling area and a discharging area along the circumference in sequence, and the material distribution area is adjacent to the discharging area. Preferably, a partition plate is respectively arranged between the areas. More preferably, all the gas in the heat stewing area enters a cooling area, and the cooling area is connected with a chimney to discharge the gas.
Preferably, the air inlet of the dust removing device is connected with the flue gas outlet of the steel slag crushing device and the dust outlets of the material distribution area and the cooling area of the continuous heat stewing device.
According to the continuous steel slag heat stewing system, high-temperature steel slag is pretreated by a steel slag crushing device to form steel slag blocks with the diameter of less than 280 mm. The massive steel slag is transported to a continuous thermal stewing device, the steel slag is continuously and uniformly arranged on a rotatable annular furnace bottom through a material distribution device of a material distribution area, the annular furnace bottom carries the steel slag, the steel slag sequentially passes through the material distribution area, a cooling area, the thermal stewing area, a cooling area and a discharging area, and finally the continuous thermal stewing device is discharged from the discharging device in the discharging area, so that qualified thermal stewing steel slag is obtained. In the cooling area, water is mainly used as cooling medium to cool down the steel slag rapidly, and the cooled steel slag and water vapor are subjected to a rapid steel slag heat stewing reaction in a heat stewing area. After the reaction is completed, the steel slag and the water vapor enter a cooling zone together. In the cooling zone, water is mainly used as cooling medium to rapidly cool the steel slag, and water vapor in the cooling zone is mainly discharged through a chimney. And the cooled steel slag enters a discharging area and is continuously discharged by discharging equipment. Finally, the qualified thermally braised steel slag is obtained, the granularity is required to be less than 20mm and less than 75%, the free calcium oxide is contained below 2%, and a feasibility foundation is provided for the next step of slag-iron magnetic separation and tailing manufacturing building material working procedure.
Preferably, the temperature of the pretreated steel slag blocks below 280mm is 500-1000 ℃.
Preferably, in the continuous thermal stewing device, the cooling area can reduce the temperature of the steel slag from 1000 ℃ to 500 ℃. Preferably, the cooling area is cooled by hot water with the temperature of more than 80 ℃. The adoption of hot water cooling at the temperature of more than 80 ℃ is beneficial to controlling the temperature of steel slag in a proper interval, and is convenient for subsequent rapid thermal stewing reaction.
More preferably, the steam generated in the cooling process enters the heat stewing area to participate in the heat stewing reaction.
Preferably, in the continuous heat stewing device, the heat stewing temperature of the steel slag in the heat stewing area is 500-280 ℃, and the thickness of the steel slag layer in the heat stewing area is preferably 100-600 mm.
Preferably, in the continuous thermal stewing device, the cooling zone can reduce the steel slag from 400 ℃ to below 90 ℃.
Preferably, the cooling zone is cooled, preferably with hot water at 80 ℃ or higher. The adoption of hot water with the temperature of more than 80 ℃ for cooling is beneficial to controlling the water content of the final thermally braised steel slag, facilitates the subsequent treatment to obtain a dried product, and omits a drying or airing link.
More preferably, part of the water vapor generated during the cooling process enters the cool down zone.
Preferably, the residence time of the steel slag in the heat stewing area is about 30-180 minutes;
Preferably, the moisture of the qualified thermally braised steel slag can be controlled within 4 percent, so that the steel slag is further processed, and the drying process is omitted.
The steel slag is self-pulverized in a continuous thermal stewing device through a steel slag thermal stewing reaction, and the steel slag thermal stewing reaction comprises physical change and chemical reaction:
1. physical change
The physical change means that the high-temperature steel slag is rapidly cooled by water vapor, and uneven cold shrinkage is generated due to the difference of expansion coefficients of steel and slag, so that the slag shell bursts and separates.
In addition, as the temperature of the steel slag decreases, at 500 ℃, beta-C2S in the slag starts to undergo crystal form transformation, and is converted into gamma-C2S, and the volume expansion is 12%, and the steel slag is further pulverized. Therefore, the powder rate of the steel slag can be improved by slowly reducing the temperature at 500 ℃.
2. Chemical reaction
The chemical reaction refers to hydrolysis reaction of free calcium oxide and magnesium oxide in steel slag when meeting steam. The hydrolysis reaction eliminates the instability of the steel slag and is the basis for the resource utilization of the steel slag. The specific reactions are that CaO+H2O= Ca (OH) 2 expands by 97.8% in volume, mgO+H2O= Mg (OH) 2 expands by 148% in volume.
CaO+H2O (g) =Ca (OH) 2, which belongs to exothermic reaction, and the temperature is the maximum influencing factor influencing the reaction rate in the stage of 0-300 ℃, and the pressure influence is larger than the temperature when the temperature is higher than 300 ℃, so that the steel slag is thermally stewed at normal pressure at a temperature of larger than 300 ℃ and the free calcium oxide reacts most rapidly. When the temperature is higher than 580 ℃, the reverse reaction occurs, namely, the free calcium oxide in the steel slag does not react with water vapor. Mgo+h2o (g) =mg (OH) 2 this reaction is reverse at 380 ℃ under normal pressure, and free magnesium oxide does not react with water vapor.
Therefore, under normal pressure, the optimal temperature range of the steel slag heat stewing is 280-500 ℃, the temperature of the steel slag is controlled to slowly decrease from 500 ℃, and the rapid heat stewing can be realized. The thermal stewing reaction time of the continuous thermal stewing system of the steel slag can be shortened to 1 hour or even shorter.
The traditional steel slag heat stewing material layer is too thick and is as high as 2 meters, water drops cannot penetrate through the material layer to directly strike the inside of the material layer, so that the temperature field is uneven, the temperature of the steel slag on the surface layer is lower than 200 ℃, the heat stewing reaction speed is low, the temperature of the steel slag in the steel slag is higher than 550 ℃, and free calcium oxide, magnesium and water vapor do not react, so that the whole heat stewing time is longer than 12 hours.
The thermal stewing reaction can realize the self-pulverization of the steel slag and the self-degradation of free calcium oxide and free magnesium oxide, so that the steel slag after thermal stewing has small granularity, is easy to grind compared with steel slag obtained by other processes, is suitable for further processing and magnetic separation utilization, can finally obtain steel slag tailings with lower free calcium oxide and free magnesium oxide, and is favorable for being reused as a high-quality building material.
ADVANTAGEOUS EFFECTS OF INVENTION
As described above, according to the continuous steel slag heat stewing system, the steel slag is paved horizontally and thinly by adopting a special structure, so that the reaction contact area of water vapor and the steel slag is increased, and the heat stewing reaction rate is accelerated. Meanwhile, the equipment has strong operability, more uniform temperature field and controllable steel slag heat stewing temperature in an ideal range, and ensures that the steel slag heat stewing reaction speed is the fastest and the self-pulverization rate is the highest in a short time. The water content of the thermally stewed steel slag is easier to control accurately, and a drying link or a water supplementing and dust suppressing link is omitted for the subsequent steel slag processing.
In addition, the rotary bed of the continuous thermal stewing device is continuously fed, continuously thermally stewed and continuously discharged, the system has high equipment and automation degree, less labor and labor staffs and low operation cost.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
Fig. 1 is a schematic structural view of a continuous steel slag heat-stewing system according to one embodiment of the invention;
Fig. 2 is a schematic flow chart of a continuous steel slag braising system according to an embodiment of the invention;
fig. 3 is a schematic plan view of a continuous thermal braising device in accordance with one embodiment of the present invention;
fig. 4 is a cross-sectional view of a cooling zone of a continuous thermal braising device in accordance with one embodiment of the present invention;
fig. 5 is a cross-sectional view of the discharge area of a continuous thermal braising device in accordance with one embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In a first aspect of the present invention, the present invention provides a continuous steel slag heat stewing system, according to an embodiment of the present invention, referring to fig. 1 to 2, the system includes:
the steel slag crushing device S100 is provided with a high-temperature steel slag inlet S101, a dust-containing flue gas outlet S102 and a block-shaped steel slag outlet S103;
the continuous thermal stewing device S200 is provided with a block-shaped steel slag inlet S201, a dust outlet S202 of a material distribution area and a material discharge area, a thermal stewing steel slag outlet S203 and a cooling area steam outlet S204, wherein the block-shaped steel slag inlet S201 is connected with the block-shaped steel slag outlet S103;
The dust removing device S200 is provided with a dust-containing flue gas inlet S301, a dust inlet S302 and a purified gas outlet S303, wherein the dust-containing flue gas inlet S301 is connected with the dust-containing flue gas outlet S102, and the dust inlet S302 is connected with the dust outlet S202 of the material distribution area and the material discharge area.
The following describes a steel slag continuous thermal braising system according to an embodiment of the present invention in detail with reference to fig. 1 to 5:
According to the embodiment of the invention, the continuous braising device S200 is in a closed annular structure and comprises an annular shell S233, a rotatable annular furnace bottom S234, a water seal structure S235 and a transmission device S237. The annular shell S233 covers the rotatable annular furnace bottom S234 to form an annular cavity, and a water seal structure S235 is adopted between the annular shell S233 and the rotatable annular furnace bottom S to seal the annular cavity so as to prevent gas from overflowing. The annular structure is provided with a material distribution area S210, a cooling area S220, a heat stewing area S230, a cooling area S240 and a discharging area S250 along the circumference in sequence, and the material distribution area S210 is adjacent to the discharging area S250. Wherein, a division plate is respectively arranged between the areas.
The material distribution area S210 is provided with continuous uniform material distribution equipment for uniformly arranging the steel slag in the continuous heat stewing device, wherein the corresponding ring angle is about 20 degrees;
The cooling area S220 is used for cooling the evenly arranged steel slag to a temperature capable of entering the heat stewing area, and the corresponding ring angle is about 7 degrees;
The heat stewing area S230 is used for conducting heat preservation and heat stewing on the cooled steel slag, and the corresponding ring angle is about 305 degrees;
The cooling area S240 is used for rapidly cooling the steel slag after heat stewing to reach a discharging temperature, and the corresponding ring angle is about 18 degrees;
the discharging area S250 is provided with a continuous discharging device for realizing continuous discharging of the steel slag, and the corresponding ring angle is about 10 degrees;
all the gas in the heat stewing zone S230 enters a cooling zone S240, and the cooling zone is connected with a chimney to exhaust the gas.
According to the embodiment of the invention, the dust removing device S300 is configured to perform centralized purification treatment on the dust-containing flue gas generated in the above process, so as to reach the flue gas emission standard. The dust removing device S300 is interconnected with the outlet of the steel slag crushing device S100, and is also interconnected with the material distributing area S210 and the material discharging area S250, and dust-containing gas generated in the production process is collected.
A continuous steel slag braising system according to an embodiment of the present invention will be further described with reference to fig. 1 to 5: first, by
The steel slag crushing device S100 pre-treats the high-temperature steel slag to form steel slag blocks with the thickness of 280mm below, wherein the temperature of the steel slag blocks is 500-1000 ℃. The massive steel slag is conveyed to a continuous heat stewing device S200, the steel slag is continuously and uniformly arranged on a rotatable annular furnace bottom through a distributing mechanism of a distributing area S210, the annular furnace bottom carries the steel slag, the steel slag sequentially passes through the distributing area S210, a cooling area S220, a heat stewing area S230, a cooling area S240 and a discharging area S250, and finally the continuous heat stewing device is discharged from discharging equipment in the discharging area S250, so that qualified heat stewing steel slag is obtained. The cooling area S220 is provided with a spraying system S232, the spraying system S232 mainly adopts hot water with the temperature of more than 80 ℃ to rapidly cool the steel slag, and the temperature of the steel slag can be reduced from 1000 ℃ to 500 ℃. The cooled steel slag and the water vapor are carried out in a heat stewing area S230 for carrying out rapid steel slag heat stewing reaction, and the heat stewing area can maintain the temperature of the steel slag between 200 ℃ and 500 ℃ so as to lead the paper to rapidly and fully react. After the heat stewing reaction is completed, the steel slag and the water vapor enter a cooling zone S240 together. The cooling area S240 mainly adopts hot water with the temperature of more than 80 ℃ to rapidly cool the steel slag, the cooling area can rapidly cool the steel slag from 400 ℃ to below 90 ℃, and the water vapor of the cooling area S240 is mainly discharged through a chimney. The cooled steel slag enters a discharging area S250 and is continuously discharged from a discharging hole S238 by discharging equipment. Finally, the qualified thermally braised steel slag is obtained, the granularity is required to be less than 20mm and accounts for 75%, and the content of free calcium oxide is less than 2%.
The foregoing examples merely illustrate embodiments of the invention and are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. A continuous thermal braising system for steel slag, comprising:
The steel slag crushing device is used for preprocessing the hot steel slag to obtain massive steel slag;
the continuous thermal stewing device is used for receiving the massive steel slag and rapidly thermally stewing the massive steel slag to obtain thermally stewed steel slag, and comprises: the material distribution area is provided with continuous and uniform material distribution equipment, and steel slag is continuously and uniformly arranged in the continuous heat stewing device; the cooling area is used for cooling the steel slag to the thermal stewing reaction temperature; the thermal stewing zone is used for conducting thermal stewing on the cooled steel slag at a heat preservation temperature; the cooling zone is used for rapidly cooling the steel slag after being thermally stewed to reach the discharging temperature; the material distribution area is provided with a continuous material outlet device for realizing continuous material outlet of the steel slag;
The continuous heat braising device structure is a closed annular structure and comprises: the device comprises an annular shell, a rotatable annular furnace bottom, a water seal structure and a transmission device; the annular shell covers the rotatable annular furnace bottom to form an annular cavity, and a water seal structure is adopted between the annular shell and the rotatable annular furnace bottom to seal the annular cavity so as to prevent gas from overflowing; the annular structure is sequentially provided with a material distribution area, a cooling area, a braising area, a cooling area and a discharging area along the circumference, and the material distribution area is adjacent to the discharging area; wherein a separation plate is respectively arranged between the areas;
the dust removing device is used for carrying out centralized purification treatment on dust-containing flue gas generated in the process, and the dust-containing flue gas reaches the flue gas emission standard.
2. The continuous thermal braising system as in claim 1, further comprising: the temperature of the steel slag pretreated by the steel slag crushing device is 500-1000 ℃.
3. The continuous thermal braising system as in claim 1, further comprising: in the continuous thermal stewing device, the cooling area can reduce the temperature of the steel slag from 1000 ℃ to 500 ℃.
4. The continuous thermal braising system as in claim 1, further comprising: in the continuous heat stewing device, the heat stewing temperature of the steel slag in the heat stewing area is 500-280 ℃, and the thickness of the steel slag layer in the heat stewing area is 100-600 mm.
5. The continuous thermal braising system as in claim 1, further comprising: in the continuous thermal stewing device, the cooling area can rapidly reduce the temperature of the steel slag from 400 ℃ to below 90 ℃.
6. The continuous braising system of steel slag as in claim 4, further comprising:
the cooling area adopts water as cooling medium, and water vapor generated in the cooling process enters the heat stewing area to participate in the heat stewing reaction.
7. The continuous braising system of steel slag as in claim 5 or 6, further comprising:
All the gas in the heat stewing area enters a cooling area, and the cooling area is connected with a chimney to discharge the gas.
8. The continuous braising system of steel slag as in claim 6, further comprising:
the cooling area adopts hot water with the temperature of more than 80 ℃ as a cooling medium, and part of water vapor generated in the cooling process enters the cooling area.
9. The continuous thermal braising system as in claim 1, further comprising: the flue gas inlet of the dust removal device is connected with the flue gas outlet of the steel slag crushing device, and the dust outlets of the material distribution area and the material discharge area of the continuous heat stewing device.
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