CN114015822A - System for comprehensive utilization and waste heat recovery of high-temperature steel slag resources and treatment method thereof - Google Patents
System for comprehensive utilization and waste heat recovery of high-temperature steel slag resources and treatment method thereof Download PDFInfo
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- CN114015822A CN114015822A CN202111621153.4A CN202111621153A CN114015822A CN 114015822 A CN114015822 A CN 114015822A CN 202111621153 A CN202111621153 A CN 202111621153A CN 114015822 A CN114015822 A CN 114015822A
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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
- C21B3/08—Cooling slag
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/04—Specific shape of slag after cooling
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- 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
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- 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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- 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
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- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
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Abstract
The invention discloses a system for comprehensive utilization and waste heat recovery of high-temperature steel slag resources and a treatment method thereof, wherein the system comprises: a steel slag granulating device; a dust removal device; the continuous thermal stewing device is used for thermally stewing materials sequentially through a material distribution area, a thermal stewing area and a material discharging area, wherein partition plates are respectively arranged among the areas; provided is a waste heat power generation device. The invention further discloses a method for treating steel slag by applying the system, which comprises the following steps: the method comprises the steps of granulating high-temperature steel slag into solid steel slag, spraying, cooling and carrying out heat exchange in a continuous hot stewing device to obtain hot stewed steel slag and high-temperature water vapor, wherein the high-temperature water vapor is used for power generation, and the hot stewed steel slag is subjected to fine crushing and magnetic separation to obtain steel slag, magnetic separation powder and tailings. The system and the method can realize the comprehensive utilization of high-temperature steel slag resources and effectively recover the sensible heat of the steel slag, and have remarkable economic benefit and environmental benefit.
Description
Technical Field
The invention relates to the field of metallurgical energy conservation and environmental protection, in particular to a system for comprehensive utilization and waste heat recovery of high-temperature steel slag resources and a treatment method thereof.
Background
The liquid metallurgical slag is a byproduct in the steel smelting production process, and is rich in metal iron, heat energy, non-metallic oxides and other recyclable and resourceful resources. Typically, for every 1 ton of primary steel produced, 0.3-0.5 ton of ironmaking liquid slag and 0.1-0.15 ton of steelmaking liquid slag can be produced, the temperature of liquid metallurgical slag is typically between 1350-. How to efficiently recycle heat in liquid slag, how to realize efficient recycling of metal iron in slag and how to realize high value-added recycling comprehensive utilization of tailings are always the direction of efforts of energy conservation and emission reduction and solid waste recycling comprehensive utilization of iron and steel enterprises in the world. However, steel enterprises in all countries around the world have not achieved the technical breakthrough, and a great deal of technical challenges in this area need to be developed.
The hot stewing method has a good effect in the technology of realizing the comprehensive recovery of steel slag resources, the self-pulverization of the steel slag and the self-degradation of free calcium oxide and free magnesium oxide can be realized through the hot stewing reaction, the steel slag after the hot stewing is favorable for small granularity, is easy to grind compared with the steel slag obtained by other processes, is suitable for further processing and magnetic separation utilization, and can finally obtain the steel slag tailings with lower free calcium oxide and free magnesium oxide, thereby being favorable for being reused as a building material with higher quality. The development of a waste heat recovery system on the basis of a thermal annealing method is an important research direction.
The invention patent CN201621024762.6 granted by the invention provides a device for generating power by using steam generated in the steel slag autoclaving process, which utilizes a large amount of low-temperature and low-pressure steam (the pressure is more than 0.2MPa and the temperature is about 140 ℃) generated in the steel slag autoclaving process, adopts the principle of an organic Rankine system, drives an ORC steam turbine to generate power continuously after indirectly exchanging heat with a power generation working medium (Freon), and can realize the net power generation amount per ton slag of more than 3 kW.h.
Due to the particularity of the pressure heat braising process and the heat braising device, the steel slag needs to be cooled to 600 ℃ and then enters the slag braising device for heat braising, so that the high-temperature heat of 600-. The prior thermal braising process is intermittent operation, a part of heat can be dissipated in the process, meanwhile, the heat of the steel slag is firstly used for generating thermal braising steam during thermal braising, the heat of the steel slag is transferred into the thermal braising steam, the thermal braising steam is discharged after the thermal braising reaction is finished, the steam temperature is about 140 ℃, the medium-temperature heat at 600 ℃ is changed into the low-temperature heat at 140 ℃, and then the waste heat recovery is carried out, so that the comprehensive heat utilization rate of the steel slag is greatly reduced. The hot stewing steam also contains a large amount of impurities, so that the heat exchanger is often scaled, and the heat exchange efficiency is influenced.
Therefore, the prior art has a place which needs to be improved in the aspects of comprehensive utilization of steel slag resources and waste heat recycling.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the invention provides a system for comprehensive utilization of high-temperature steel slag resources and recovery of waste heat and a use method thereof. The system can realize the remarkable recovery of high-temperature waste heat on the basis of realizing the good comprehensive recycling effect of the steel slag, and has remarkable economic benefit and environmental benefit.
The invention provides a system for comprehensive utilization and waste heat recovery of high-temperature steel slag resources, which comprises the following components in part by weight:
the steel slag granulating device is provided with a high-temperature steel slag inlet, a solid steel slag outlet and a flue gas outlet;
the dust removal device is provided with a flue gas inlet and a purified gas outlet, and the flue gas inlet is connected with the flue gas outlet of the steel slag granulating device;
the continuous hot stewing device is provided with a solid steel slag inlet, a spray water inlet, a condensed water inlet, a hot stewing gas outlet, a high-temperature water vapor outlet and a hot stewing steel slag outlet, and the solid steel slag inlet is connected with the solid steel slag outlet of the steel slag granulating device;
the fine crushing and magnetic separation device is provided with a hot-stewed steel slag inlet, a steel slag outlet, a magnetic separation powder outlet and a tailing outlet, and the hot-stewed steel slag inlet is connected with the hot-stewed steel slag outlet;
the waste heat power generation device is provided with a high-temperature steam inlet, an electric energy outlet and a condensed water outlet, the high-temperature steam inlet is connected with the high-temperature steam outlet, and the condensed water outlet is connected with a condensed water inlet of the continuous thermal stewing device.
In addition, the system for the comprehensive utilization and waste heat recovery of the high-temperature steel slag resources can also have the following additional technical characteristics:
the continuous thermal braising device comprises:
the material distribution area is used for arranging the solid steel slag in the continuous hot braising device;
the hot stewing area is used for completing hot stewing reaction of the steel slag and performing heat exchange to recover the heat of the steel slag;
and the material distribution area is provided with a spiral discharging device to realize continuous discharging of the steel slag.
In addition, the system for the comprehensive utilization and waste heat recovery of the high-temperature steel slag resources can also have the following additional technical characteristics:
the continuous thermal stewing device is of an annular structure and comprises an annular shell and a rotatable annular furnace bottom, wherein the annular shell covers the rotatable annular furnace bottom to form an annular cavity, and a water seal groove is used for sealing between the annular shell and the rotatable annular furnace bottom to prevent gas from overflowing. The annular structure is provided with a material distribution area, a hot stewing area and a material discharging area along the circumference in sequence, and the material distribution area is adjacent to the material discharging area. Preferably, a partition plate is respectively arranged between each zone. The thermal stewing area is provided with an exhaust hole close to the discharging area for exhausting thermal stewing gas.
Preferably, the bottom of the partition plate is 200 mm and 600mm away from the annular furnace bottom. Preferably, the distance between the bottoms of the partition plates and the upper surface of the steel slag layer paved on the furnace bottom is 10-150 mm.
Preferably, the heat-soaking zone is provided with a heat exchanger for recovering heat and generating high-temperature water vapor.
Preferably, the hot stewing area is provided with a spraying system for controlling the hot stewing area to uniformly spray water to cool the steel slag.
The invention further provides a method for treating steel slag by applying the system, which comprises the following steps:
A. firstly, the steel slag granulation device pretreats the thermal-state steel slag to obtain solid steel slag.
B. The solid steel slag enters the continuous hot braising device through a material distribution area of the continuous hot braising device, sequentially passes through the material distribution area, the hot braising area and a material discharge area, and is continuously discharged from the material discharge area. And a spraying system in the hot stewing area sprays water to cool the steel slag, the steel slag is subjected to hot stewing reaction to obtain hot stewed steel slag and hot stewing gas, and meanwhile, a heat exchanger absorbs the heat of the steel slag to obtain high-temperature water vapor.
C. The hot-stewed steel slag is subjected to fine crushing and magnetic separation treatment to obtain steel slag, magnetic separation powder and a tailing product.
D. High-temperature steam enters the waste heat power generation device to obtain electric energy and condensed water, and the condensed water returns to the heat exchanger of the continuous thermal stewing device to exchange heat again.
In the invention, the solid steel slag in the step A is non-flowing steel slag, and comprises the following steps: solid and semi-solid. Preferably the solid steel slag temperature is between 700 ℃ and 1250 ℃. More preferably, the solid steel slag has a particle size of 500mm or less, wherein 85% is accounted for by 300mm or less.
And B, the flue gas generated in the steel slag granulation process in the step A can not reach the emission standard, and the flue gas is firstly guided into a dust removal device for purification and then discharged. The dust removing device adopts one or more combination modes of spraying, water bath, electric dust removal, cloth bag dust removal and the like. Preferably, the purified gas contains less than 10mg/Nm3 of solid particles.
And in the step B, the spraying system adopts low-speed water flow to cool the steel slag, and the water flow speed is not more than 1 m/s. Preferably, the spray system forms water droplets with a particle size of 95% not less than 1 mm. The large water drops can effectively reduce the content of impurities brought into the hot stewing gas by water, thereby solving the problem that the contact surface of the heat exchanger and the hot stewing gas is often scaled. More preferably, the water pressure of the spraying system is not more than 0.15 MPa. More preferably, the spraying system sprays water to cool the steel slag at a plurality of positions. After the sprayed low-speed water contacts the steel slag, hot stewing gas containing a large amount of water vapor is generated, and the hot stewing gas ascends to contact with the heat exchanger. High-temperature steam is generated in the heat exchanger after heat exchange and is discharged for the power generation of the waste heat power generation device. In a certain temperature range, the steel slag and water or steam are subjected to a thermal braising reaction, and the steel slag realizes self-pulverization and free calcium oxide degradation in the reaction process.
And in the step B, the discharging direction of hot braising gas generated in the hot braising area is the same as the discharging direction of the steel slag. Preferably, the gas exit temperature of the hot-annealing zone is less than 100 ℃. More preferably, the hot-stewed steel slag discharge temperature is less than 100 ℃. Preferably, the air pressure in the heat stewing area is-200 pa to +150 pa.
And C, crushing the hot-stewed steel slag to be less than 10mm, carrying out magnetic separation under a certain magnetic field intensity to obtain slag steel, wherein the iron content of the slag steel is generally more than 80%, carrying out magnetic separation under a stronger magnetic field intensity to obtain magnetic separation powder and tailings, wherein the iron content of the magnetic separation powder is more than 48%, and the metal content of the tailings is less than 2%. The magnetic separation powder and the slag steel are returned to a steel plant for reuse, and the tailings are further finely ground and used for building materials.
And D, the movement direction of the condensed water in the heat exchanger in the hot stewing area is opposite to the movement direction of the steel slag, and the movement direction of the condensed water in the heat exchanger is opposite to the discharge direction of hot stewing gas, so that high-temperature steam with higher temperature is obtained.
The steel slag hot stewing reaction comprises physical change and chemical reaction:
1. physical change
The physical change means that the high-temperature steel slag is rapidly cooled when meeting water vapor, and the slag shell is cracked and separated due to uneven cold contraction caused by different expansion coefficients of steel and slag. Further, as the temperature of the steel slag is lowered, the hydraulic mineral C3S in the slag starts to undergo crystal transformation, and the volume thereof expands, whereby the steel slag is further pulverized. The physical changes are the basis for realizing the separation of the steel slag by the steel slag hot stewing process. The transformation of the crystal form of the hydraulic mineral C3S is as follows, C3S → C2S + CaO.
2. Chemical reaction
The chemical reaction refers to hydrolysis reaction of free calcium oxide and magnesium oxide in the steel slag when meeting water vapor. The hydrolysis reaction eliminates the instability of the steel slag and is the basis of the resource utilization of the steel slag. The specific reaction comprises 97.8 percent of volume expansion of CaO + H2O = = Ca (OH)2 and 148 percent of volume expansion of MgO + H2O = = Mg (OH) 2. Reactions such as 3Fe +4H2O = = Fe3O4+4H2, 2C + O2= =2CO, and the like are also included.
ADVANTAGEOUS EFFECTS OF INVENTION
As described above, according to the system and method for comprehensive utilization of high-temperature steel slag resources and recovery of waste heat according to the present invention, effective thermal annealing reaction and heat exchange of steel slag are performed by the continuous thermal annealing device, sensible heat of steel slag from 1250 ℃ to 100 ℃ can be effectively recovered, water vapor with a higher temperature can be obtained, and effective utilization of high-temperature steel slag resources and effective recovery of waste heat can be comprehensively achieved. The special continuous thermal annealing device and the spraying system can generate thermal annealing gas with lower impurity content, thereby effectively solving the problem of scaling of the heat exchanger.
In addition, according to the system for comprehensively utilizing the high-temperature steel slag resources and recovering the waste heat, most of the heat of the high-temperature steel slag is transferred to a power generation system through heat exchange, the defects that a large amount of water is needed to absorb heat and smoke is discharged outside in the prior art are overcome, the water resources are effectively saved, and the amount of waste gas discharged into the air is reduced.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of a system for comprehensive utilization of high-temperature steel slag resources and recovery of waste heat according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a system for comprehensive utilization of high-temperature steel slag resources and recovery of waste heat according to an embodiment of the invention.
Figure 3 is a plan view illustration of a continuous thermal anneal apparatus according to one embodiment of the present invention.
Figure 4 is a schematic cross-sectional view of a continuous thermal annealing apparatus according to one embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In a first aspect of the present invention, the present invention provides a system for comprehensive utilization and waste heat recovery of high-temperature steel slag resources, and according to an embodiment of the present invention, with reference to fig. 1 to 2, the system includes:
a steel slag granulating device S100, which is provided with a high-temperature steel slag inlet S101, a solid steel slag outlet S103 and a flue gas outlet S102; the dust removal device S200 is provided with a flue gas inlet S201 and a purified gas outlet S202, and the flue gas inlet S201 is connected with the flue gas outlet S102; the continuous hot stewing device S300 is provided with a solid steel slag inlet S301, a spray water inlet S302, a condensed water inlet S303, a high-temperature water vapor outlet S304, a hot stewing gas outlet S305 and a hot stewing steel slag outlet S306, wherein the solid steel slag inlet S301 is connected with the solid steel slag outlet S103; the fine crushing and magnetic separation device S400 is provided with a hot braised steel slag inlet S401, a steel slag outlet S402, a magnetic separation powder outlet S403 and a tailings outlet S404, and the hot braised steel slag inlet S401 is connected with the hot braised steel slag outlet S306; the waste heat power generation device S500 is provided with a high-temperature steam inlet S501, an electric energy outlet S503 and a condensed water outlet S502, the high-temperature steam inlet S501 is connected with a high-temperature steam outlet S304 of the continuous heat stewing device, and the condensed water outlet S502 is connected with a condensed water inlet S303 of the continuous heat stewing device.
In addition, the system for comprehensive utilization of high-temperature steel slag resources and recovery of waste heat according to the above embodiment of the present invention may further have the following additional technical features:
the continuous thermal braising apparatus S300 includes: a material distribution area S310, wherein the material distribution area is used for arranging the solid steel slag in the continuous hot braising device; a hot stewing area S320, wherein the hot stewing area is used for completing the hot stewing reaction of the steel slag and performing heat exchange to recover the heat of the steel slag; and a discharging area S330, wherein the material distribution area is provided with a spiral discharging device S331, so that the continuous discharging of the steel slag is realized.
In addition, the system for comprehensive utilization of high-temperature steel slag resources and recovery of waste heat according to the above embodiment of the present invention may further have the following additional technical features:
the continuous heat braising device structure is an annular structure and comprises: the annular casing S321, the rotatable annular furnace bottom S322, the water seal groove and the transmission device, the annular casing covers the rotatable annular furnace bottom to form an annular cavity, and the water seal groove S323 is used for sealing between the annular casing and the rotatable annular furnace bottom to prevent gas overflow. The annular structure is sequentially provided with a material distribution area S310, a heat-stewing area S320 and a material discharge area S330 along the circumference, and the material distribution area S310 is adjacent to the material discharge area S330. Preferably, a separation plate S324 is disposed between each of the zones. An exhaust hole S325 is arranged in the position of the thermal stewing area, which is close to the discharging area, and is used for exhausting thermal stewing gas.
According to different treatment capacities, the bottom of the separation plate S324 is 600mm away from the annular furnace bottom 200-. As a preferred embodiment, the distance from the bottom of the partition plate S324 to the upper surface of the steel slag layer S328 of the annular furnace bottom S322 is 10-150 mm.
The heat-soaking zone is provided with a heat exchanger S326 for recovering heat and generating high-temperature water vapor.
And the hot stewing area is provided with a spraying system S327 for controlling the hot stewing area to uniformly spray water to cool the steel slag.
On the other hand, as shown in fig. 1-4, the embodiment of the present invention provides a method for processing steel slag by using the above system, comprising the following steps:
A. firstly, the steel slag granulation device pretreats the thermal-state steel slag to obtain solid steel slag.
B. The solid steel slag enters the continuous hot braising device through a material distribution area of the continuous hot braising device, sequentially passes through the material distribution area, the hot braising area and a material discharge area, and is continuously discharged from the material discharge area. And a spraying system in the hot stewing area sprays water to cool the steel slag, the steel slag is subjected to hot stewing reaction to obtain hot stewed steel slag and hot stewing gas, and meanwhile, a heat exchanger absorbs the heat of the steel slag to obtain high-temperature water vapor.
C. The hot-stewed steel slag is subjected to fine crushing and magnetic separation treatment to obtain steel slag, magnetic separation powder and a tailing product.
D. High-temperature steam enters the waste heat power generation device to obtain electric energy and condensed water, and the condensed water returns to the heat exchanger of the continuous thermal stewing device to exchange heat again.
In the embodiment of the present invention, the solid steel slag in step a is non-flowing steel slag, and includes: solid and semi-solid. As a preferred embodiment, the solid steel slag temperature is between 700 ℃ and 1250 ℃. More preferably, the solid steel slag has a particle size of 500mm or less, wherein 85% is accounted for by 300mm or less.
In the embodiment of the invention, the spraying system in the step B adopts low-speed water flow to cool the steel slag, and the water flow speed is not more than 1 m/s. Preferably, the spray system forms water droplets with a particle size of 95% not less than 1 mm. The water pressure of the spraying system is not more than 0.15 Mpa. The spraying system sprays water to the steel slag at multiple positions for cooling. After the sprayed low-speed water contacts the steel slag, hot stewing gas containing a large amount of water vapor is generated, and the hot stewing gas ascends to contact with the heat exchanger. High-temperature steam is generated in the heat exchanger after heat exchange and is discharged for the power generation of the waste heat power generation device. In a certain temperature range, the steel slag and water or steam are subjected to a thermal braising reaction, and the steel slag realizes self-pulverization and free calcium oxide degradation in the reaction process.
In the embodiment of the invention, the discharging direction of the hot stewing gas generated in the hot stewing zone in the step B is the same as the discharging direction of the steel slag, and preferably, the gas discharging temperature of the hot stewing zone is lower than 100 ℃. The discharging temperature of the hot-stewed steel slag is lower than 100 ℃. The air pressure in the hot stewing area is-200 pa to +150 pa.
In the embodiment of the invention, the hot-stewed steel slag in the step C is crushed to be less than 10mm, the slag steel is obtained by magnetic separation under the magnetic field intensity of 1500Gs, the iron content of the slag steel is generally more than 80 percent, then the slag steel is subjected to magnetic separation under the magnetic field intensity of 2500Gs to obtain magnetic separation powder and tailings, the iron content of the magnetic separation powder is more than 48 percent, the metal content of the tailings is less than 2 percent, and the content of free calcium oxide is less than 2.3 percent. The magnetic separation powder and the slag steel are returned to a steel plant for reuse, and the tailings are further finely ground and used for building materials. The magnetic field intensity is not limited, and different magnetic field intensity systems are required for different steel slag properties and product requirements.
In the embodiment of the invention, in the step D, the movement direction of the condensed water in the heat exchanger in the hot stewing area is opposite to the movement direction of the steel slag; the movement direction of the condensed water in the heat exchanger is opposite to the discharge direction of the hot stewing gas.
The above examples only express embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The invention discloses a system for comprehensive utilization and waste heat recovery of high-temperature steel slag resources, which is characterized by comprising the following components:
the steel slag granulating device is provided with a high-temperature steel slag inlet, a solid steel slag outlet and a flue gas outlet;
the dust removal device is provided with a flue gas inlet and a purified gas outlet, and the flue gas inlet is connected with the flue gas outlet of the steel slag granulating device;
the continuous hot stewing device is provided with a solid steel slag inlet, a spray water inlet, a condensed water inlet, a hot stewing gas outlet, a high-temperature water vapor outlet and a hot stewing steel slag outlet, and the solid steel slag inlet is connected with the solid steel slag outlet of the steel slag granulating device;
the fine crushing and magnetic separation device is provided with a hot-stewed steel slag inlet, a steel slag outlet, a magnetic separation powder outlet and a tailing outlet, and the hot-stewed steel slag inlet is connected with the hot-stewed steel slag outlet of the continuous hot-stewed device;
the waste heat power generation device is provided with a high-temperature steam inlet, an electric energy outlet and a condensed water outlet, the high-temperature steam inlet is connected with the high-temperature steam outlet, and the condensed water outlet is connected with the condensed water inlet of the continuous thermal stewing device.
2. The system for comprehensive utilization and waste heat recovery of high-temperature steel slag resources as claimed in claim 1, further comprising: the continuous thermal braising device comprises: the material distribution area is used for arranging the solid steel slag in the continuous hot braising device; the hot stewing area is used for completing hot stewing reaction of the steel slag and performing heat exchange to recover the heat of the steel slag; and the material distribution area is provided with a spiral discharging device to realize continuous discharging of the steel slag.
3. The system for comprehensive utilization and waste heat recovery of high-temperature steel slag resources as claimed in claim 1, further comprising: the continuous hot stewing device is of an annular structure and comprises an annular shell and a rotatable annular furnace bottom, wherein the annular shell covers the rotatable annular furnace bottom to form an annular cavity, a water seal groove is adopted between the annular shell and the rotatable annular furnace bottom to seal, the annular structure is sequentially provided with a material distribution area, a hot stewing area and a material discharging area along the circumference, the material distribution area is adjacent to the material discharging area, and an exhaust hole is formed in the position, close to the material discharging area, of the hot stewing area to exhaust hot stewing gas.
4. The system of claim 3, further comprising: the distance between the bottom of the partition plate and the annular furnace bottom is 200 mm and 600 mm.
5. A continuous thermal braising apparatus according to claim 3, further comprising: the heat-stewing area is provided with a heat exchanger for recovering heat and generating high-temperature water vapor.
6. A continuous thermal braising apparatus according to claim 3, further comprising: and the hot stewing area is provided with a spraying system for controlling the hot stewing area to uniformly spray water to cool the steel slag.
7. A method for processing steel slag using the system of any one of claims 1 to 6, comprising the steps of:
a. the steel slag granulating device is used for pretreating the thermal steel slag to obtain solid steel slag with the temperature of 700-1250 ℃;
b. solid steel slag enters the continuous thermal braising device through a material distribution area of the continuous thermal braising device, sequentially passes through the material distribution area, the thermal braising area and a material discharge area, and is finally discharged from the material discharge area, a spraying system of the thermal braising area sprays water to cool the steel slag, the steel slag is subjected to thermal braising reaction to obtain thermal braising steel slag and thermal braising gas, and meanwhile, a heat exchanger absorbs the heat of the steel slag to obtain high-temperature water vapor;
c. carrying out fine crushing and magnetic separation treatment on the hot-stewed steel slag to obtain steel slag, magnetic separation powder and a tailing product;
d. and introducing the high-temperature water vapor into the waste heat power generation device to obtain electric energy and condensed water, and returning the condensed water into a heat exchanger of the continuous thermal braising device for heat exchange again.
8. The method as claimed in claim 7, wherein the hot-braising zone spraying system cools the steel slag by using low-speed water flow, the water flow speed is not more than 1m/s, and the spraying system forms water drops with the granularity of 95% not less than 1 mm.
9. The method of claim 7, wherein: the internal air pressure of the hot stewing is-200 pa to +150 pa.
10. A continuous thermal braising apparatus according to claim 7, further comprising: the condensed water and the steel slag in the heat exchanger of the hot stewing area move relatively; the hot stewing gas and the steel slag are opposite; the gas discharge temperature of the heat stewing zone is lower than 100 ℃.
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