CN114015822B - System for comprehensively utilizing high-temperature steel slag resources and recovering waste heat and treatment method thereof - Google Patents
System for comprehensively utilizing high-temperature steel slag resources and recovering waste heat and treatment method thereof Download PDFInfo
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- CN114015822B CN114015822B CN202111621153.4A CN202111621153A CN114015822B CN 114015822 B CN114015822 B CN 114015822B CN 202111621153 A CN202111621153 A CN 202111621153A CN 114015822 B CN114015822 B CN 114015822B
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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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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a system for comprehensively utilizing high-temperature steel slag resources and recovering waste heat and a processing method thereof, wherein the system comprises the following components: a steel slag granulating device; a dust removal device; the continuous heat stewing device sequentially passes through a material distribution area, a heat stewing area and a material discharging area, wherein a separation plate is respectively arranged between the areas; and a waste heat power generation device. The invention further discloses a method for processing steel slag by using the system, which comprises the following steps: granulating high-temperature steel slag into solid steel slag, spraying, cooling and heat exchanging in a continuous heat stewing device, and obtaining heat stewing steel slag and high-temperature water vapor, wherein the high-temperature water vapor is used for generating electricity, and the heat stewing steel slag is subjected to fine-crushing magnetic separation to obtain slag steel, magnetic separation powder and tailings. The system and the method can realize comprehensive utilization of high-temperature steel slag resources and effectively recover sensible heat of the steel slag, and have obvious economic benefit and environmental benefit.
Description
Technical Field
The invention relates to the field of metallurgy energy conservation and environmental protection, in particular to a system for comprehensively utilizing high-temperature steel slag resources and recovering waste heat and a treatment method thereof.
Background
The liquid metallurgical slag is a byproduct in the steel smelting production process, and is rich in recoverable and recyclable resources such as metallic iron, heat energy, nonmetallic oxides and the like. Typically, 0.3 to 0.5 tons of liquid slag for iron making and 0.1 to 0.15 tons of liquid slag for steel making can be produced per 1 ton of primary steel produced, the temperature of the liquid metallurgical slag typically being between 1350 and 1550 ℃, the ton of slag containing heat equivalent to about 60kg of standard coal. How to efficiently recycle the heat in the liquid slag, how to realize the efficient recycling of the metal iron in the slag and how to realize the high added value recycling comprehensive utilization of the tailings is always the effort direction of energy conservation, emission reduction and solid waste recycling comprehensive utilization of global iron and steel enterprises. However, all the iron and steel enterprises in the world fail to realize the technical breakthrough in the aspect, and a great deal of technical attack in the aspect is required to be developed.
The thermal stewing method has better effect in the technology of realizing the comprehensive recovery of steel slag resources, the thermal stewing reaction can realize the self-pulverization of steel slag and the self-degradation of free calcium oxide and free magnesium oxide, so that the steel slag after thermal stewing is favorable for small granularity, is easy to grind compared with steel slag obtained by other processes, is suitable for further processing and magnetic separation utilization, and finally can obtain steel slag tailings with lower free calcium oxide and free magnesium oxide, and is favorable for recycling as a high-quality building material. The development of waste heat recovery systems based on the thermal stewing method is an important research direction.
The patent CN201621024762.6 of the invention is issued to provide a device for generating electricity by utilizing steam generated in the steel slag pressure heat stewing process, which utilizes a large amount of low-temperature low-pressure steam (the pressure is more than 0.2MPa and the temperature is about 140 ℃) generated in the steel slag pressure heat stewing process, adopts the principle of an organic Rankine system, and drives an ORC steam turbine to continuously generate electricity after indirectly exchanging heat with a power generation working medium (Freon), so that the net power generation capacity of ton slag is more than 3 kW.h.
The pressure heat stewing process and the heat stewing device thereof have the particularity that the steel slag is required to be cooled to 600 ℃ and then enters the heat stewing device for heat stewing, so that the heat at the high temperature of 600-1350 ℃ is wasted. At present, the heat stewing process is intermittent operation, a part of heat is dissipated in the process, meanwhile, the heat of steel slag is firstly used for generating heat stewing steam during heat stewing, the heat of the steel slag is transferred into the heat stewing steam, the heat stewing steam is discharged after the heat stewing reaction is finished, at the moment, the steam temperature is 140 ℃, the medium-temperature heat at 600 ℃ is changed into the low-temperature heat at 140 ℃, and then the waste heat is recovered, so that the comprehensive heat utilization rate of the steel slag is greatly reduced. The heat stewed steam also contains a large amount of impurities, which causes frequent scaling of the heat exchanger and affects the heat exchange efficiency.
Therefore, the prior art has a place for improvement in the aspect of comprehensively utilizing the steel slag resources and recycling the waste heat.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the invention provides a system for comprehensively utilizing high-temperature steel slag resources and recovering waste heat and a using method thereof. The system can realize the remarkable recovery of the high-temperature waste heat on the basis of realizing the good comprehensive recovery and utilization effect of the steel slag, and has remarkable economic benefit and environmental benefit.
The invention provides a system for comprehensively utilizing high-temperature steel slag resources and recovering waste heat, which comprises 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 removing 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 heat stewing device is provided with a solid steel slag inlet, a spray water inlet, a condensate water inlet, a heat stewing gas outlet, a high-temperature steam outlet and a heat stewing steel slag outlet, wherein the solid steel slag inlet is connected with the solid steel slag outlet of the steel slag granulating device;
the fine magnetic separation device is provided with a thermally-braised steel slag inlet, a steel slag outlet, a magnetic separation powder outlet and a tailings outlet, wherein the thermally-braised steel slag inlet is connected with the thermally-braised steel slag outlet;
the waste heat power generation device is provided with a high-temperature steam inlet, an electric energy outlet and a condensation water outlet, wherein the high-temperature steam inlet is connected with the high-temperature steam outlet, and the condensation water outlet is connected with the condensation water inlet of the continuous thermal stewing device.
In addition, the system for comprehensively utilizing the high-temperature steel slag resources and recovering the waste heat 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 heat stewing device;
the heat stewing zone is used for completing a heat stewing reaction of the steel slag and carrying out heat exchange to recover the heat of the steel slag;
and the material distribution area is provided with a spiral material outlet device to realize continuous steel slag discharge.
In addition, the system for comprehensively utilizing the high-temperature steel slag resources and recovering the waste heat can also have the following additional technical characteristics:
the continuous heat 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 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 provided with a material distribution area, a heat 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 the areas. The position of the heat stewing area, which is close to the discharging area, is provided with an exhaust hole for exhausting heat stewing gas.
Preferably, the bottom of the partition plate is 200-600mm from the annular hearth. Preferably, the bottom of the partition plate is 10-150mm away from the upper surface of the steel slag layer paved on the bottom of the furnace.
Preferably, the heat stewing area is provided with a heat exchanger for recovering heat and generating high-temperature water vapor.
Preferably, a spraying system is arranged in the heat stewing area and is used for controlling the heat stewing area to uniformly spray water to cool the steel slag.
The invention further provides a method for processing steel slag by using the system, which comprises the following steps: A. firstly, the steel slag granulating device pretreats the thermal state steel slag to obtain solid steel slag.
B. The solid steel slag enters the continuous thermal stewing device through the material distribution area of the continuous thermal stewing device, sequentially passes through the material distribution area, the thermal stewing area and the material discharging area, and finally is continuously discharged from the material discharging area. The spraying system of the heat stewing area sprays water to cool the steel slag, the steel slag is subjected to heat stewing reaction to obtain heat stewing steel slag and heat stewing gas, and meanwhile, the heat exchanger absorbs the heat of the steel slag to obtain high-temperature steam.
C. The thermally stewed steel slag is subjected to fine crushing and magnetic separation treatment to obtain slag steel, magnetic separation powder and tailings products.
D. The 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 heat stewing device to exchange heat again.
In the present invention, the solid steel slag in the step a is non-flowing steel slag, which includes: solid and semi-solid. Preferably the solid steel slag temperature is between 700 ℃ and 1250 ℃. More preferably, the solid steel slag particle size is all 500mm or less, wherein 300mm or less accounts for 85%.
And (3) the flue gas generated in the steel slag granulating process in the step A does not reach the emission standard, and the flue gas is required to be discharged after being guided into a dust removing device for purification. The dust removing device adopts one or more combination modes of spraying, water bath, electric dust removing, cloth bag dust removing and the like. Preferably, the cleaned gas contains less than 10mg/Nm3 of solid particles.
And B, cooling the steel slag by adopting low-speed water flow in the spraying system, wherein the water flow speed is not more than 1m/s. Preferably, the spray system forms 95% or more of the water droplets having a particle size of not less than 1mm. The adoption of large water drops can effectively reduce the impurity content of the hot stewing gas, thereby solving the problem of frequent scaling of the contact surface of the heat exchanger and the hot stewing gas. More preferably, the spray system water pressure is no greater than 0.15MPa. 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 power generation of the waste heat power generation device. In a certain temperature range, the steel slag and water or steam are subjected to heat stewing reaction, and the steel slag realizes self pulverization and free calcium oxide degradation in the reaction process.
And B, discharging the hot stewing gas generated in the hot stewing zone in the step, wherein the discharging direction of the hot stewing gas is the same as the discharging direction of the steel slag. Preferably, the gas exit temperature of the thermally braised zone is below 100 ℃. More preferably, the discharge temperature of the thermally braised steel slag is lower than 100 ℃. Preferably, the air pressure in the heat stewing area is between-200 pa and +150pa.
And C, crushing the thermally-stewed steel slag to be less than 10mm, magnetically separating the thermally-stewed steel slag under a certain magnetic field strength to obtain slag steel, wherein the iron content of the slag steel is generally more than 80%, magnetically separating the slag steel under a stronger magnetic field strength 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 slag steel are returned to a steel mill for reuse, and the tailings are further finely ground for use in building materials.
And D, the movement direction of the condensed water in the heat exchanger in the heat 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 the stewing gas, so that high-temperature steam with higher temperature is obtained.
The steel slag thermal braising 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, the hydraulic mineral C3S in the slag starts to undergo crystal transformation, volume expansion, and further pulverization of the steel slag. The physical change is the basis for realizing the separation of slag and steel by the steel slag heat stewing process. The crystalline transformation process 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 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 reaction is that CaO+H2O= Ca (OH) 2 expands by 97.8 percent in volume; mgo+h2o= Mg (OH) 2 expands 148% in volume. 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 comprehensively utilizing and recovering waste heat of high-temperature steel slag resources, the continuous heat stewing device is used for realizing effective heat stewing reaction and heat exchange of steel slag, sensible heat of steel slag from 1250 ℃ to 100 ℃ can be effectively recovered, steam with higher temperature can be obtained, and the resource effective utilization and waste heat effective recovery of high-temperature steel slag are comprehensively realized. The special continuous heat stewing device and the spraying system generate heat stewing gas with lower impurity content, thereby effectively solving the problem of scale formation of the heat exchanger.
In addition, according to the system for comprehensively utilizing and recovering waste heat of the high-temperature steel slag resources, most of heat of the high-temperature steel slag is transferred to the power generation system through heat exchange, the defect that a large amount of water is required to absorb heat and form smoke to be discharged in the prior art is overcome, the water resources are effectively saved, and the amount of waste gas discharged into the air is reduced.
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 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 present invention.
Fig. 3 is a plan view schematic diagram of a continuous thermal braising device according to one embodiment of the present invention.
Fig. 4 is a schematic cross-sectional view of a continuous thermal braising apparatus according to 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 system for comprehensive utilization and waste heat recovery of high temperature steel slag resources, according to an embodiment of the present invention, referring to fig. 1 to 2, the system includes:
the steel slag granulating device S100 is provided with a high-temperature steel slag inlet S101, a solid steel slag outlet S103 and a flue gas outlet S102; the dust removing 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; a continuous thermal stewing device S300, wherein the continuous thermal stewing device is provided with a solid steel slag inlet S301, a spray water inlet S302, a condensate water inlet S303, a high-temperature steam outlet S304, a thermal stewing gas outlet S305 and a thermal stewing steel slag outlet S306, and the solid steel slag inlet S301 is connected with the solid steel slag outlet S103; the fine magnetic separation device S400 is provided with a thermally-braised steel slag inlet S401, a steel slag outlet S402, a magnetic separation powder outlet S403 and a tailings outlet S404, wherein the thermally-braised steel slag inlet S401 is connected with the thermally-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 condensate outlet S502, wherein the high-temperature steam inlet S501 is connected with the high-temperature steam outlet S304 of the continuous heat stewing device, and the condensate outlet S502 is connected with the condensate inlet S303 of the continuous heat stewing device.
In addition, the system for comprehensively utilizing the high-temperature steel slag resources and recovering the waste heat according to the embodiment of the invention can also have the following additional technical characteristics:
the continuous thermal braising device S300 comprises: a distribution area S310 for arranging the solid steel slag in the continuous thermal stewing device; a heat stewing zone S320, wherein the heat stewing zone is used for completing the heat stewing reaction of the steel slag and carrying out heat exchange to recover the heat of the steel slag; and the discharging area S330 is provided with a spiral discharging device S331, so that continuous discharging of the steel slag is realized.
In addition, the system for comprehensively utilizing the high-temperature steel slag resources and recovering the waste heat according to the embodiment of the invention can also have the following additional technical characteristics:
the continuous heat braising device structure is an annular structure, and comprises: the annular shell S321, the rotatable annular furnace bottom S322, the water seal groove and the transmission device are covered on the rotatable annular furnace bottom to form an annular cavity, and the annular cavity are sealed by adopting the water seal groove S323 to prevent gas from overflowing. The annular structure is provided with a material distribution area S310, a heat stewing area S320 and a material discharging area S330 along the circumference in sequence, and the material distribution area S310 is adjacent to the material discharging area S330. Preferably, a partition plate S324 is provided between each of the regions. The position of the heat stewing area close to the discharging area is provided with an exhaust hole S325 for exhausting heat stewing gas.
The bottom of the partition plate S324 is 200-600mm away from the annular furnace bottom according to different treatment capacities. As a preferred embodiment, the bottom of the separation plate S324 is 10-150mm away from the upper surface of the steel slag layer S328 which is horizontally paved on the annular furnace bottom S322.
The heat stewing area is provided with a heat exchanger S326 for recovering heat and generating high-temperature water vapor.
The heat stewing area is provided with a spraying system S327 for controlling the heat 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 invention provides a method for processing steel slag by using the system, which comprises the following steps:
A. firstly, the steel slag granulating device pretreats the thermal state steel slag to obtain solid steel slag.
B. The solid steel slag enters the continuous thermal stewing device through the material distribution area of the continuous thermal stewing device, sequentially passes through the material distribution area, the thermal stewing area and the material discharging area, and finally is continuously discharged from the material discharging area. The spraying system of the heat stewing area sprays water to cool the steel slag, the steel slag is subjected to heat stewing reaction to obtain heat stewing steel slag and heat stewing gas, and meanwhile, the heat exchanger absorbs the heat of the steel slag to obtain high-temperature steam.
C. The thermally stewed steel slag is subjected to fine crushing and magnetic separation treatment to obtain slag steel, magnetic separation powder and tailings products.
D. The 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 heat stewing device to exchange heat again.
In the embodiment of the present invention, the solid steel slag in the step a is non-flowing steel slag, which 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 particle size is all 500mm or less, wherein 300mm or less accounts for 85%.
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 1m/s. Preferably, the spray system forms 95% or more of the water droplets having a particle size of not less than 1mm. The water pressure of the spraying system is not more than 0.15Mpa. 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 power generation of the waste heat power generation device. In a certain temperature range, the steel slag and water or steam are subjected to heat stewing reaction, and the steel slag realizes self pulverization and free calcium oxide degradation in the reaction process.
In the embodiment of the present invention, in the step B, the exhaust direction of the hot stewing gas generated in the hot stewing zone is the same as the exhaust direction of the steel slag, and preferably, the exhaust temperature of the gas in the hot stewing zone is lower than 100 ℃. The discharge temperature of the thermally braised steel slag is lower than 100 ℃. The air pressure in the thermal stewing area is-200 pa to +150pa.
In the embodiment of the invention, the thermally braised 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 strength of 1500Gs, the iron content of the slag steel is generally more than 80%, the magnetic separation powder and the tailings are obtained by magnetic separation under the magnetic field strength of 2500Gs, the iron content of the magnetic separation powder is more than 48%, the metal content of the tailings is less than 2%, and the free calcium oxide content of the tailings is less than 2.3%. The magnetic separation powder and slag steel are returned to a steel mill for reuse, and the tailings are further finely ground for use in 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, the movement direction of the condensed water in the heat exchanger in the step D in the heat 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 discharging direction of the heat stewing gas.
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 (7)
1. The utility model provides a system for high temperature steel slag resource comprehensive utilization and waste heat recovery which characterized in that includes: 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 removing 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 heat stewing device is provided with a solid steel slag inlet, a spray water inlet, a condensate water inlet, a heat stewing gas outlet, a high-temperature steam outlet and a heat stewing steel slag outlet, wherein the solid steel slag inlet is connected with the solid steel slag outlet of the steel slag granulating device, the continuous heat stewing device is of an annular structure and comprises an annular shell and a rotatable annular furnace bottom, 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 cavity, a material distribution area, a heat stewing area and a material discharge area are sequentially arranged in the annular structure along the circumference, the material distribution area is adjacent to the material discharge area, partition plates are respectively arranged between the material distribution area and the material discharge area, the bottom of each partition plate is 200-600mm away from the annular furnace bottom, and the heat stewing area is close to the material discharge area to discharge air;
the fine magnetic separation device is provided with a thermally-braised steel slag inlet, a steel slag outlet, a magnetic separation powder outlet and a tailings outlet, wherein the thermally-braised steel slag inlet is connected with the thermally-braised steel slag outlet of the continuous thermally-braising device; the waste heat power generation device is provided with a high-temperature steam inlet, an electric energy outlet and a condensation water outlet, wherein the high-temperature steam inlet is connected with the high-temperature steam outlet, and the condensation water outlet is connected with the condensation water inlet of the continuous thermal stewing device.
2. The system for comprehensive utilization and waste heat recovery of high temperature steel slag resources according to claim 1, wherein the continuous thermal stewing device comprises:
the material distribution area is used for arranging the solid steel slag in the continuous heat stewing device;
the heat stewing zone is used for completing a heat stewing reaction of the steel slag and carrying out heat exchange to recover the heat of the steel slag;
and the material distribution area is provided with a spiral material outlet device to realize continuous steel slag discharge.
3. The system for comprehensive utilization and waste heat recovery of high-temperature steel slag resources according to claim 1, wherein a heat exchanger is arranged in the heat stewing area and is used for recovering heat and generating high-temperature steam.
4. The system for comprehensive utilization and waste heat recovery of high-temperature steel slag resources according to claim 1, wherein a spraying system is arranged in the heat stewing area and is used for controlling uniform water spraying in the heat stewing area to cool steel slag.
5. A method for treating steel slag by using the system for comprehensive utilization and waste heat recovery of high-temperature steel slag resources according to any one of claims 1 to 4, comprising the steps of:
a. the steel slag granulating device pretreats the hot steel slag to obtain solid steel slag with the temperature of 700-1250 ℃; b. the solid steel slag enters the continuous thermal stewing device through a material distribution area of the continuous thermal stewing device, sequentially passes through the material distribution area, the thermal stewing area and a material discharging area, and is finally discharged from the material discharging area, a spraying system of the thermal stewing area sprays water to cool the steel slag, the steel slag is subjected to thermal stewing reaction to obtain thermal stewing steel slag and thermal stewing gas, meanwhile, a heat exchanger absorbs heat of the steel slag to obtain high-temperature water vapor, the spraying system of the thermal stewing area adopts low-speed water flow to cool the steel slag, the water flow speed is not more than 1m/s, and the spraying system forms water drop granularity not less than 1mm;
c. carrying out fine crushing and magnetic separation treatment on the thermally stewed steel slag to obtain slag steel, magnetic separation powder and tailings products;
d. the high-temperature steam is led into 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 heat stewing device to exchange heat again.
6. The method of claim 5, wherein the gas pressure in the braised zone is between-200 pa and +150pa.
7. The method of claim 5, wherein the condensed water in the heat exchanger of the braising zone moves relative to the steel slag; the movement direction of the hot stewing gas is the same as that of the steel slag; the gas discharge temperature of the thermal braising zone is lower than 100 ℃.
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