CN110698087A - Device and method for comprehensively utilizing thermal-state steel slag - Google Patents
Device and method for comprehensively utilizing thermal-state steel slag Download PDFInfo
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- CN110698087A CN110698087A CN201911072960.8A CN201911072960A CN110698087A CN 110698087 A CN110698087 A CN 110698087A CN 201911072960 A CN201911072960 A CN 201911072960A CN 110698087 A CN110698087 A CN 110698087A
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- steel slag
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- carbon dioxide
- heat energy
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- 239000002893 slag Substances 0.000 title claims abstract description 150
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 148
- 239000010959 steel Substances 0.000 title claims abstract description 148
- 238000000034 method Methods 0.000 title claims abstract description 25
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 66
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 58
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 44
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 33
- 229910052742 iron Inorganic materials 0.000 claims abstract description 29
- 238000011084 recovery Methods 0.000 claims abstract description 27
- 238000012545 processing Methods 0.000 claims abstract description 20
- 238000010298 pulverizing process Methods 0.000 claims description 15
- 239000000126 substance Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 12
- 238000005507 spraying Methods 0.000 claims description 12
- 239000004568 cement Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 238000004064 recycling Methods 0.000 claims description 8
- 239000006148 magnetic separator Substances 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- 238000005245 sintering Methods 0.000 claims description 5
- 238000009628 steelmaking Methods 0.000 claims description 5
- 238000010248 power generation Methods 0.000 claims description 3
- 238000011946 reduction process Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 23
- 238000006243 chemical reaction Methods 0.000 description 9
- 238000007885 magnetic separation Methods 0.000 description 7
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 6
- 239000000292 calcium oxide Substances 0.000 description 6
- 239000005431 greenhouse gas Substances 0.000 description 6
- 238000007789 sealing Methods 0.000 description 5
- 239000000843 powder Substances 0.000 description 4
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 3
- 239000004566 building material Substances 0.000 description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000009919 sequestration Effects 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- -1 alkali metal salt Chemical class 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000011278 co-treatment Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 229910052806 inorganic carbonate Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001089 mineralizing effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B5/00—Treatment of metallurgical slag ; Artificial stone from molten metallurgical slag
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B5/00—Treatment of metallurgical slag ; Artificial stone from molten metallurgical slag
- C04B5/06—Ingredients, other than water, added to the molten slag or to the granulating medium or before remelting; Treatment with gases or gas generating compounds, e.g. to obtain porous slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
-
- 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
Abstract
The invention relates to a device and a method for comprehensively utilizing thermal-state steel slag, wherein the device comprises a steel slag processing unit, a carbonating unit, an iron recovery unit, a tailings collecting unit and a heat energy comprehensive utilization unit; the discharge hole of the steel slag processing unit is connected with the feed inlet of the carbonation unit; the air outlet of the steel slag processing unit is connected with the air inlet of the heat energy comprehensive utilization unit; the discharge hole of the carbonation unit is connected with the feed inlet of the iron recovery unit; the slag outlet of the iron recovery unit is connected with the feed inlet of the tailings collection unit; the air outlet of the carbonation unit is connected with the air inlet of the heat energy comprehensive utilization unit; and a carbon dioxide gas outlet of the heat energy comprehensive utilization unit is connected with a gas inlet of the carbonation unit and a gas inlet of the steel slag processing unit. The device can realize the high-efficient recycle of resources and heat energy in the steel slag.
Description
Technical Field
The invention belongs to solid waste recycling and CO2The field of emission reduction and efficient energy utilization, and relates to a device and a method for comprehensively utilizing thermal-state steel slag.
Background
At present, CO2As a major component of greenhouse gases, has become a major concern worldwide. At present, the related CO is widely developed at home and abroad2Research on trap containment technology and industrial experiments. Common CO2The sealing technology comprises geological sealing, ocean sealing, ore carbonization and land ecological unit sealing. Wherein the ore carbonization and sequestration utilizes CO2Reacting with alkali or alkaline earth oxide to convert CO2Conversion to solid inorganic carbonate, thereby CO2Is fixed. The ore being carbonized to CO2Direct carbonation is an effective way to realize the stable storage of greenhouse gases and large-scale resource utilization.
The steel slag is the main solid waste in the steel industry, and the thermal state steel slag generated each year is approximately 1 hundred million tons. The steel slag contains more free CaO and MgO, so that the stability of the steel slag is poor, the steel slag is difficult to utilize in a large scale, and the utilization rate is low. However, the more alkaline earth oxides contained in the steel slag can be used as fixed CO2The free CaO and MgO in the steel slag are eliminated, and the carbonated steel slag can be used for road building, cement production, backfilling and the like. Thus, direct carbonation sequestration of CO using steel slag simulated ore2Has wide prospect.
In addition, the temperature of the thermal-state steel slag from the converter can reach 1600 ℃, the steel slag is mainly treated by a water quenching method at present, so that the waste of heat is inevitable, the digestion of free alkali metals in the steel slag is not complete, and the pulverization effect of the steel slag is not ideal. And heat-stewed asThe new way for treating the steel slag has more advantages, high pulverization rate, good stability, high iron recovery rate, energy conservation and consumption reduction. Pulverization of steel slag into CO during thermal braising2The absorption of the slag provides larger specific surface area, and the pulverized steel slag after cooling also has CO content2The carbonation of (2) is advantageous.
The patent CN10269998A introduces industrial flue gas into a fluidized bed filled with steel slag, reacts for 2-5 hours, and then the carbonated steel slag is thrown into the ocean in the form of particles or bricks. In patent CN1721043A, granular steel slag is mixed and carbonated into blocks, and the blocks are put into water for cultivation. Both of the above patents require sufficient time and temperature to allow more CO2Is absorbed. Patent CN103111186A mentions a method for fixing CO by mineralizing steel slag2The method comprises the step of adding a catalyst containing alkali metal salt to strengthen the calcium oxide component and CO in the steel slag2And reacting to improve the conversion rate of the calcium oxide component in the steel slag and the carbon fixing efficiency of the steel slag. Patent CN101851071A discloses a CO2The patent of the method for digesting the free calcium oxide in the fixed and steel slag micro powder utilizes the CO in the waste flue gas2The steel slag micro powder is chemically modified, so that the content of free CaO is reduced, the chemical stability of the steel slag micro powder is improved, and the national standard technical requirements of GB/T20491-2006 for the steel slag powder in cement and concrete are met. The above two patents mainly aim at the treatment of steel slag in a cold state, and steel slag needs to be ground during the treatment process, so that the treatment cost is inevitably increased and the waste of heat energy is caused.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a device and a method for comprehensively utilizing thermal steel slag, and the device and the method can realize the efficient recovery of resources in the comprehensive utilization of the steel slag and the reutilization of redundant energy in the treatment process. The tailings which can not be utilized can be directly conveyed to building material enterprises without treatment to be used as raw materials of cement and roadbed materials.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a device for comprehensive utilization of thermal state steel slag, which comprises a steel slag processing unit, a carbonation unit, an iron recovery unit, a tailings collection unit and a heat energy comprehensive utilization unit;
the discharge hole of the steel slag processing unit is connected with the feed inlet of the carbonation unit; the air outlet of the steel slag processing unit is connected with the air inlet of the heat energy comprehensive utilization unit;
the discharge hole of the carbonation unit is connected with the feed inlet of the iron recovery unit;
the slag outlet of the iron recovery unit is connected with the feed inlet of the tailings collection unit;
the air outlet of the carbonation unit is connected with the air inlet of the heat energy comprehensive utilization unit;
and a carbon dioxide gas outlet of the heat energy comprehensive utilization unit is connected with a gas inlet of the carbonation unit and a gas inlet of the steel slag processing unit.
The device for comprehensively utilizing the steel slag provided by the invention firstly carries out CO treatment on the hot steel slag from the converter2And (4) gas heat exchange, wherein the heat exchanged gas enters a heat energy utilization unit for power generation or heat supply. The temperature of the steel slag after heat exchange is reduced from 1600 ℃ to about 400-2And simultaneously, the volume of the steel slag expands in the reaction process, so that the pulverization volume of the steel slag is reduced. The specific surface area of the pulverized steel slag is further increased, at the moment, the pulverized steel slag is sent to a carbonation treatment unit, and CO is introduced2Gas, carbonating the steel slag, further reducing the temperature of the steel slag, and exchanging heat to obtain CO2The gas enters a heat energy utilization unit. And magnetically separating the carbonated steel slag to select useful iron elements, and collecting tailings after magnetic separation to be used as raw materials of cement and roadbed materials.
As a preferable technical scheme of the invention, the steel slag processing unit comprises a hot stuffy device and a spraying device which are sequentially connected.
Preferably, the hot stuffy equipment is cooled by carbon dioxide gas.
In the invention, the adopted hot stuffy equipment can be a hot stuffy tank or a hot stuffy furnace, and the spraying equipment can be a spraying pipe and the like, but the equipment is not limited to the listed equipment, and other equipment capable of realizing similar functions in the prior art can be utilized.
In a preferred embodiment of the present invention, the temperature of the steel slag treatment unit is reduced to 500-800 ℃, for example, 500 ℃, 525 ℃, 550 ℃, 575 ℃, 600 ℃, 625 ℃, 650 ℃, 675 ℃, 700 ℃, 725 ℃, 750 ℃, 775 ℃ or 800 ℃, etc., but not limited to the listed values, and other values not listed in the range are also applicable.
Preferably, the initial temperature of the hot steel slag is 1600-1700 ℃, such as 1600 ℃, 1610 ℃, 1620 ℃, 1630 ℃, 1640 ℃, 1650 ℃, 1660 ℃, 1670 ℃, 1680 ℃, 1690 ℃ or 1700 ℃, but not limited to the listed values, and other values not listed in the range are also applicable.
In the invention, the thermal steel slag is cooled by utilizing the carbon dioxide gas, so that the thermal steel slag reaches a better pulverization temperature and a foundation is provided for pulverization; and the gas after heat exchange is introduced into a heat energy comprehensive utilization unit to realize the recovery and further utilization of heat energy and carbon dioxide. And the steam which is not utilized and is generated in the spraying equipment is introduced into the heat energy comprehensive utilization unit to realize the recycling of steam heat energy and steam.
As the preferable technical scheme of the invention, the spraying equipment in the steel slag processing unit is used for pulverization of the steel slag after cooling.
Preferably, the pulverization is carried out by using intermittent water spraying.
As a preferable technical scheme of the invention, the temperature of the pulverized steel slag in the spraying equipment in the steel slag processing unit is 300-400 ℃.
Preferably, the pulverized steel slag has a particle size of 8 to 15, such as 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm or 15mm, but not limited to the listed values, and other values not listed in the range are also applicable.
In the invention, the cooled water is atomized by intermittent water sprayingCaO in the thermal state steel slag fully reacts with water to generate Ca (OH)2Thereby realizing the full pulverization of the steel slag and providing a foundation for the carbonation of the steel slag. And simultaneously, the carbon dioxide which is not fully utilized in the carbonation unit is introduced into the heat energy comprehensive recycling unit to recycle heat energy and substances.
As a preferred technical scheme of the invention, the carbonation unit comprises a steel slag absorption reaction kettle.
The steel slag absorption reaction kettle mainly performs carbonation reaction of carbon dioxide and pulverized steel slag, the steel slag reaction kettle is a conventional reaction kettle for realizing the reaction, the reaction kettle comprises a stirrer, a reaction container and a gas conveying pipe, and the steel slag absorption reaction kettle can be automatically configured according to the operation parameters of the whole device.
Preferably, the steel slag after being cooled is carbonated by using carbon dioxide in the carbonation unit.
Preferably, the temperature of the steel slag after the carbonation treatment is 50 to 100 ℃, for example, 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃ or 100 ℃, etc., but not limited to the listed values, and other values not listed in the range are also applicable.
In the invention, the powdered steel slag is carbonated through the carbon dioxide gas, so that the carbon dioxide can be fixed in the carbonated steel slag, meanwhile, the temperature of the steel slag is further reduced in the carbonation process to carry out the subsequent process, and the carbon dioxide gas which is not utilized after heat exchange is introduced into the heat energy comprehensive utilization unit to realize the recovery of the carbon dioxide gas and the heat energy.
As a preferable technical scheme of the invention, the iron recovery unit comprises a low-intensity magnetic separator and/or a medium-intensity magnetic separator.
Preferably, the recovered iron is used for sintering or steelmaking.
In the invention, the recovery of iron-containing substances in the carbonated steel slag is realized through magnetic separation, and different magnetic separation processes can be adopted according to the difference of the iron-containing substances in the steel slag, for example, one of low-intensity magnetic separation, medium-intensity magnetic separation or high-intensity magnetic separation or the reasonable matching of the magnetic separation processes can be adopted, so that the high-efficiency recovery of the iron-containing substances is realized.
As a preferable technical scheme of the invention, the tailings collection unit comprises a vibrating screen and a conveying device.
In the invention, the used conveying equipment is a belt conveyor which can be configured automatically according to parameters.
Preferably, the tailings collection unit uses the completely processed tailings as a raw material for cement or roadbed material.
In the invention, the recovery of useful iron-containing substances in the steel slag and the application of tailings in the steel slag in the building material industry without treatment are realized by reasonably treating the thermal steel slag.
As a preferred technical scheme of the invention, the heat energy comprehensive utilization unit comprises a heat exchanger and/or a boiler.
Preferably, the heat energy comprehensive utilization unit recovers the carbon dioxide used for temperature reduction, the water vapor generated in the pulverization and the heat carried in the carbon dioxide not utilized in the carbonation treatment for power generation or heat supply.
Preferably, the carbon dioxide gas after heat exchange returns to the steel slag processing unit and/or the carbonation unit for recycling.
The invention realizes the high-efficiency recovery and utilization of gas substances and heat energy in the utilization of the thermal-state steel slag through the coupling of the heat energy comprehensive utilization unit and other units.
In a second aspect, the invention provides a method for comprehensively utilizing thermal steel slag, which comprises the following steps:
(1) cooling the thermal steel slag at the temperature of 1600-;
(2) carrying out carbonation treatment on the powdered steel slag with the temperature of 300-400 ℃ obtained in the step (1) in a carbon dioxide atmosphere to obtain carbonated steel slag;
(3) magnetically separating the steel slag with the carbonation temperature of 50-100 ℃ obtained in the step (2) to obtain iron-containing substances and tailings; the iron-containing substance is used for sintering or steelmaking; the tailings are used as raw materials of cement or roadbed materials;
and (3) collecting carbon dioxide which is not utilized in the temperature reduction process and the carbonation process, and then returning to the step (1) and/or the step (2) for recycling.
In the invention, the pulverization time is not limited, and the granularity of the pulverized steel slag is only 8-15 mm. And meanwhile, the time of carbonation is not limited, and the time can be selected according to the alkalinity of the carbonated steel slag and the application of the steel slag in the subsequent process.
Compared with the prior art, the invention at least has the following beneficial effects:
(1) the whole comprehensive utilization way of the steel slag is additionally provided with a heat energy utilization unit and a steel slag carbonation unit, can realize hundred percent resource utilization and heat energy utilization of the steel slag, and can realize the sealing and storage of greenhouse gases.
(2) The treatment time of the steel slag in the carbonation unit can be adjusted according to the temperature reduction temperature of the steel slag and the carbonation time.
(3) The heat energy utilization unit can recycle the medium-low temperature and high-temperature waste heat in the steel slag cooling process.
(4) Compared with the traditional thermal stewing tank, the thermal stewing equipment is provided with only a pipeline inlet and outlet, so that the heat exchange of gas is facilitated.
Drawings
Fig. 1 is a schematic view of a device for comprehensive utilization of thermal steel slag provided by an embodiment of the invention.
The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
In the description of the present invention, the terms "mounted," "connected," and "fixed" are to be understood in a broad sense, and may be, for example, either fixedly or removably connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
To better illustrate the invention and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the invention are as follows:
example 1
As shown in fig. 1, the device for comprehensive utilization of steel slag provided by the invention comprises a steel slag processing unit, a carbonation unit, an iron recovery unit, a tailings collection unit and a heat energy comprehensive utilization unit;
the steel slag processing unit utilizes carbon dioxide gas to realize the cooling of the hot steel slag in a hot stuffy furnace, then utilizes the intermittent water spraying of a spray pipe to realize the pulverization of the hot steel slag after the cooling, and then conveys the pulverized steel slag to the steel slag absorption reaction kettle to carbonate the steel slag; and then conveying the carbonated steel slag to the iron recovery unit to realize recovery of iron-containing substances through a magnetic separator, conveying the unrecoverable tailings to a vibrating screen through the iron recovery unit to be screened, and conveying the unrecoverable tailings through a belt conveyor to realize effective recovery of the tailings, so that the unrecoverable tailings can be used as raw materials of cement and roadbed materials in the building material industry without treatment.
Wherein, carbon dioxide gas introduced into the hot stuffy furnace is conveyed to the heat exchanger and/or the boiler through a pipeline after heat exchange to realize the recovery of heat energy and carbon dioxide. In the process of spraying the steel slag, the heat energy taken away by water gasification realizes the recovery of the heat energy and water by conveying water vapor to a heat exchanger and/or a boiler. Meanwhile, the carbon dioxide gas which is not fully utilized in the steel slag absorption reaction kettle can also carry heat energy, and the heat energy of the carbon dioxide gas is recycled through a heat exchanger and/or a boiler. Further, the recovered carbon dioxide gas can be used for a steel slag treatment unit and a steel slag absorption reaction kettle. To achieve sufficient fixation of greenhouse gases.
Application example 1
The invention provides a method for comprehensively utilizing thermal steel slag, which comprises the following steps:
(1) cooling the thermal steel slag at the temperature of 1600-;
(2) carrying out carbonation treatment on the powdered steel slag with the temperature of 300-400 ℃ obtained in the step (1) in a carbon dioxide atmosphere to obtain carbonated steel slag;
(3) magnetically separating the steel slag obtained in the step (2) and carbonated at 50-100 ℃ to obtain iron-containing substances and tailings; the iron-containing substance is used for sintering or steelmaking; the tailings are used as raw materials of cement or roadbed materials;
the thermal steel slag used in the application example is converter steel slag of a steel mill, and meanwhile, carbon dioxide which is not utilized in the temperature reduction process and the carbonation process is collected and then returned to the step (1) and/or the step (2) for recycling. In the application example, specific parameters are not limited in detail, because within the above parameter range, the hundred percent resource utilization and the heat energy utilization of the steel slag can be realized, and the greenhouse gas can be sealed and stored at the same time.
In summary, the steel slag comprehensive utilization is reasonably designed, so that hundred percent resource utilization and heat energy utilization of the steel slag are realized, and greenhouse gas is sealed and stored; further, efficient recovery of gases and heat energy that are not fully utilized is also achieved.
The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. The device for comprehensively utilizing the thermal-state steel slag is characterized by comprising a steel slag processing unit, a carbonating unit, an iron recovery unit, a tailings collecting unit and a heat energy comprehensive utilization unit;
the discharge hole of the steel slag processing unit is connected with the feed inlet of the carbonation unit; the air outlet of the steel slag processing unit is connected with the air inlet of the heat energy comprehensive utilization unit;
the discharge hole of the carbonation unit is connected with the feed inlet of the iron recovery unit;
the slag outlet of the iron recovery unit is connected with the feed inlet of the tailings collection unit;
the air outlet of the carbonation unit is connected with the air inlet of the heat energy comprehensive utilization unit;
and a carbon dioxide gas outlet of the heat energy comprehensive utilization unit is connected with a gas inlet of the carbonation unit and a gas inlet of the steel slag processing unit.
2. The apparatus of claim 1, wherein the steel slag treatment unit comprises a hot stuffer and a spray device connected in sequence;
preferably, the hot stuffy equipment is cooled by carbon dioxide gas.
3. The device as claimed in claim 1 or 2, wherein the temperature of the steel slag treatment unit is reduced to 500-800 ℃ for the temperature of the thermal steel slag;
preferably, the initial temperature of the hot steel slag is 1600-1700 ℃.
4. The apparatus according to any one of claims 1 to 3, wherein the steel slag treatment unit comprises a spraying device for pulverization of the cooled steel slag;
preferably, the pulverization is carried out by using intermittent water spraying.
5. The apparatus as claimed in any one of claims 1 to 4, wherein the temperature of the pulverized steel slag in the spraying equipment in the steel slag processing unit is 300-400 ℃;
preferably, the grain size of the pulverized steel slag is 8-15 mm.
6. The apparatus of any of claims 1-5, wherein the carbonation unit comprises a steel slag absorption reactor;
preferably, the steel slag after being cooled is carbonated by using carbon dioxide in the carbonation unit;
preferably, the temperature of the steel slag after the carbonation treatment is 50-100 ℃.
7. The apparatus of any one of claims 1 to 6, wherein the iron recovery unit comprises a low magnetic field magnetic separator and/or a medium magnetic field magnetic separator;
preferably, the recovered iron-containing material is used for sintering or steelmaking.
8. The apparatus of any one of claims 1-7, wherein the tailings collection unit comprises a vibrating screen and a conveying device;
preferably, the tailings collection unit uses the completely processed tailings as a raw material for cement or roadbed material.
9. The apparatus according to any one of claims 1 to 8, wherein the thermal energy complex utilization unit comprises a heat exchanger and/or a boiler;
preferably, the heat energy comprehensive utilization unit recovers the carbon dioxide used for temperature reduction, the water vapor generated in the pulverization and the heat carried by the carbon dioxide not utilized in the carbonation treatment for power generation or heat supply;
preferably, the carbon dioxide gas after heat exchange returns to the steel slag processing unit and/or the carbonation unit for recycling.
10. A method for comprehensively utilizing thermal steel slag is characterized by comprising the following steps:
(1) cooling the thermal steel slag at the temperature of 1600-;
(2) carrying out carbonation treatment on the powdered steel slag with the temperature of 300-400 ℃ obtained in the step (1) in a carbon dioxide atmosphere to obtain carbonated steel slag;
(3) magnetically separating the steel slag with the carbonation temperature of 50-100 ℃ obtained in the step (2) to obtain iron-containing substances and tailings; the iron-containing substance is used for sintering or steelmaking; the tailings are used as raw materials of cement or roadbed materials;
and (3) collecting carbon dioxide which is not utilized in the temperature reduction process and the carbonation process, and then returning to the step (1) and/or the step (2) for recycling.
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