CN114657291A - Device and method for quenching carbonized steel slag by using carbon dioxide - Google Patents
Device and method for quenching carbonized steel slag by using carbon dioxide Download PDFInfo
- Publication number
- CN114657291A CN114657291A CN202210298248.5A CN202210298248A CN114657291A CN 114657291 A CN114657291 A CN 114657291A CN 202210298248 A CN202210298248 A CN 202210298248A CN 114657291 A CN114657291 A CN 114657291A
- Authority
- CN
- China
- Prior art keywords
- steel slag
- quenching
- carbon dioxide
- carbon
- air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002893 slag Substances 0.000 title claims abstract description 198
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 164
- 239000010959 steel Substances 0.000 title claims abstract description 164
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 152
- 238000010791 quenching Methods 0.000 title claims abstract description 106
- 230000000171 quenching effect Effects 0.000 title claims abstract description 100
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 76
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 40
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 70
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 70
- 230000007246 mechanism Effects 0.000 claims abstract description 45
- 238000010000 carbonizing Methods 0.000 claims abstract description 28
- 238000003860 storage Methods 0.000 claims abstract description 10
- 239000002245 particle Substances 0.000 claims description 30
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 28
- 239000007788 liquid Substances 0.000 claims description 28
- 238000003763 carbonization Methods 0.000 claims description 24
- 239000008187 granular material Substances 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 20
- 229910052742 iron Inorganic materials 0.000 claims description 14
- 238000000227 grinding Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 5
- 239000004566 building material Substances 0.000 abstract description 6
- 238000010248 power generation Methods 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract description 2
- 239000000292 calcium oxide Substances 0.000 description 19
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 19
- 239000007789 gas Substances 0.000 description 18
- 239000011575 calcium Substances 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 239000010419 fine particle Substances 0.000 description 8
- 239000003245 coal Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000002918 waste heat Substances 0.000 description 6
- 239000004568 cement Substances 0.000 description 5
- 238000005469 granulation Methods 0.000 description 5
- 230000003179 granulation Effects 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 238000009628 steelmaking Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011236 particulate material Substances 0.000 description 4
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 2
- 239000010426 asphalt Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 229910001341 Crude steel Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- 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
- C21B3/08—Cooling slag
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/04—Specific shape of slag after cooling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Metallurgy (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Structural Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Furnace Details (AREA)
Abstract
The invention provides a device and a method for carbonizing steel slag by using carbon dioxide gas quenching, which comprises a steel slag barrel, a carbon dioxide storage tank, a deep carbon quenching mechanism, a heat energy utilization mechanism and a steel slag carbonizing tank body, wherein the steel slag barrel and the carbon dioxide storage tank are respectively connected with the deep carbon quenching mechanism through pipelines, the heat energy utilization mechanism is respectively connected with the carbon dioxide storage tank and the deep carbon quenching mechanism through pipelines, and the deep carbon quenching mechanism is connected with the steel slag carbonizing tank body. The method for carbonizing steel slag by using carbon dioxide gas quenching realizes that the steel slag is applied to the field of building materials after being carbonated, and simultaneously realizes the recovery heating or power generation of the heat energy of the steel slag.
Description
Technical Field
The invention belongs to the field of environmental protection, and particularly relates to a device and a method for quenching carbonized steel slag by using carbon dioxide.
Background
The steel slag is a byproduct generated in steel making, takes silicate and ferrite as main components, and is about 6-12% of the steel yield. At present, the pretreatment process for recycling the steel slag mainly comprises a hot splashing method, a disc splashing method, a hot stewing method, a water quenching method, a roller method, an air quenching method, a granulation wheel method and the like. In the processes, from the viewpoints of simple process and low investment, a hot splashing method, a hot stewing method and a water quenching method are mostly adopted; in view of the physical state of the steel slag, the steel slag having good fluidity can be subjected to a disc pouring method, a water quenching method, a drum method, a wind quenching method, or a granulation wheel method. The air quenching method has the advantages of small grain size of slag particles obtained by treatment, narrow grain size distribution range, high condensation speed, relatively thorough digestion of free calcium oxide, uniform distribution of each crystal phase, very fine crystal particles and the like, and has become one of the main pretreatment methods for recycling the steel slag. In the steel slag treatment method, the utilization efficiency of the heat energy of the steel slag is low.
The air quenching method uses compressed air as a medium, molten and semi-molten steel slag particles fly forwards along with the compressed air during air extraction, and the compressed air has strong oxidation effect on high-temperature steel slag by high-speed jet flow in the crushing flying process, so that oxides (CaO, MgO) of alkali metals and alkaline earth metals can be formed. The steel slag has chemical composition and mineralogical composition similar to those of portland cement, and the steel slag is mainly used as a raw material for cement production, aggregate for the cement coagulation industry and the like.
At present, the technical defects of the production process of steel enterprises are that the utilization rate of the steel slag discharged in production is low due to free f-CaO and f-MgO, the stacking of the steel slag pollutes the environment, and the wide application of the steel slag in the field of building materials is influenced. The free f-CaO and the free f-MgO in the steel slag have a small amount of free f-CaO in common portland cement, but the hydration activity of the free f-CaO and the free f-MgO is relatively high, and the free f-CaO is hydrated simultaneously when the cement is hydrated and solidified, so that the hardened slurry can not be damaged. In the steel slag processed by the prior art, the hydration activity of free f-CaO and f-MgO is very low, and the free f-CaO and f-MgO are hydrated in other cementing materials and are combinedAfter the slurry is solidified and formed, the free f-CaO and the f-MgO are still hydrated, and the free f-CaO is hydrated to generate Ca (OH)2The volume is increased by 0.98 times, and the free state f-MgO is hydrated to generate Mg (OH)2The volume is increased by 1.48 times, and the hardened cement paste can be cracked, cracks are generated, even the hardened cement paste is directly crushed, and the stability is seriously damaged.
In the production process of steel enterprises, another technical disadvantage is that the waste heat of the steel slag is not fully recycled. Industrial boiler produces 2.7 tons of CO per ton of coal burned2If the waste heat recovered from the molten steel slag is used to replace the heat generated by coal, the CO generated by the coal can be reduced2And simultaneously reduces CO in the steelmaking process2Is generated. The molten steel slag generated by steel making contains a large amount of heat energy at about 1600 ℃. According to the experiment, the steel slag contains 2000KJ (1600 ℃) of heat per kilogram of steel slag, and about 300 ten thousand tons of steel slag discharged by the saddle steel in 2009 (the total heat is more than 6 x 10)12KJ) if the thermal energy is used instead of burning coal, 35 ten thousand tons of CO generated from about 13 ten thousand tons of standard coal can be reduced2The heat of steel slag discharged nationwide can reduce the carbon dioxide discharge of about 1000 ten thousand tons brought by the coal. In 2018, the yield of steel slag in China is about 1.39 hundred million tons, and the proportion of the steel slag to the yield of crude steel is 15 percent. Combining the rough steel output data counted by the national statistical bureau, the preliminary estimation of the steel slag output in China in 2020 is about 1.60 hundred million tons.
Research shows that the steel slag with higher Ca content has higher carbonation activity, particularly the calcium is mainly f-CaO or Ca (OH)2Rather than in the form of calcium silicate. After rapid carbonation of CaO in molten steel slag, Ca in the calcium-containing silicate diffuses to the surface of the steel slag particles and precipitates on the surface of the steel slag particles, resulting in Ca-depleted silicon-rich regions around Ca-containing silicate nuclei. The calcium carbonate layer hinders the outward diffusion of Ca from the inside of the steel slag particles, so that the reaction rate of hydration activity is reduced. Through improving the air quenching method, the molten steel slag is crushed into steel slag with different grain diameters under the strong impact force and cooling action of high-pressure carbon dioxide airflow through the actions of shearing and the like so as to meet the requirements of subsequent building materials on the steel slag with different grain diameters, and simultaneously, the high-pressure dioxygenThe carbon gasification gas accelerates the carbonation of CaO on the surface of the molten steel slag, and finally solves the problem that the steel slag with different particle sizes is hydrated to generate volume expansion after being added into a building material, so as to realize deep reclamation of the steel slag.
Disclosure of Invention
In view of the above, the present invention provides a device and a method for quenching carbonized steel slag by carbon dioxide gas, which are used to overcome the defects in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the utility model provides an utilize carbon dioxide gas quenching carbonization slag's device, includes slag bucket, carbon dioxide holding vessel, degree of depth carbon quenching mechanism, heat energy utilization mechanism, the slag carbonization jar body, slag bucket, carbon dioxide holding vessel respectively through the pipeline with degree of depth carbon quenching mechanism link to each other, heat energy utilization mechanism respectively through the pipeline with carbon dioxide holding vessel, degree of depth carbon quenching mechanism link to each other, degree of depth carbon quenching mechanism with the slag carbonization jar body link to each other.
Furthermore, the deep carbon quenching mechanism comprises a plurality of stages of carbon quenching units, and the carbon quenching units are connected through pipelines.
Furthermore, the deep carbon quenching mechanism comprises a primary carbon quenching unit and a secondary carbon quenching unit, and the primary carbon quenching unit is connected with the secondary carbon quenching unit through a pipeline;
the one-level carbon quenching unit comprises an air chamber, the inside of the air chamber is provided with a liquid slag chute, an air blower, a carbonated steel slag particle material crushing unit and a particle material collector, the air chamber is provided with a feed inlet, an air inlet and a discharge hole, the feed inlet is connected with the steel slag barrel through a pipeline, the feed inlet is positioned above the liquid slag chute, the air inlet is respectively connected with a carbon dioxide storage tank and the air blower through a pipeline, the liquid slag chute is positioned above the air blower, the carbonated steel slag particle material crushing unit is positioned on one side of the air blower, the particle material collector is positioned on one side of the carbonated steel slag particle material crushing unit, and the particle material collector is connected with the discharge hole.
Further, the secondary carbon quenching unit comprises an air chamber, a liquid slag chute, an air blower, a carbonized steel slag granular material crushing unit and a granular material collector are arranged in the air chamber, the air chamber is provided with a feed inlet, an air inlet and a discharge outlet, the feed inlet is connected with the discharge outlet of the primary carbon quenching unit through a pipeline, the feed inlet is positioned above the liquid slag chute, the air inlet is respectively connected with the heat energy utilization mechanism and the air blower through pipelines, the liquid slag chute is positioned above the air blower, the carbonated steel slag granular material crushing unit is positioned at one side of the air blower, the granular material collector is positioned at one side of the carbonated steel slag granular material crushing unit and is connected with the discharge port; the top of the air chamber is provided with a plurality of power-assisted air nozzles, and the air inlets are respectively connected with the power-assisted air nozzles; the number of the power-assisted air nozzles is more than 8; and a pressure release valve is arranged on the air chamber.
Further, the unit for crushing the carbonated steel slag particle materials comprises a support, the support is located in the air chamber, a ball screw is arranged on the support and connected with a rotating motor, a crushing roller is rotationally connected with a nut of the ball screw, and the crushing roller is located on the support.
Furthermore, a plurality of power-assisted air nozzles are arranged at the top of the air chamber, and the air inlets are respectively connected with the power-assisted air nozzles; the number of the power-assisted air nozzles is more than 8; and a pressure release valve is arranged on the air chamber.
Further, a bin gate plate is arranged on the steel slag carbonization tank body, and a stirrer and a steel slag collector are arranged in the steel slag carbonization tank body; the device for carbonizing the steel slag by using the carbon dioxide gas quenching also comprises a magnetic iron selection device, wherein the deep carbon quenching mechanism is connected with the magnetic iron selection device through a pipeline, and the magnetic iron selection device is connected with the steel slag carbonization tank body through a pipeline.
Further, the length of the air chamber is 20-35m, and the width of the air chamber is 10 m; the inside of the particle material collector is provided with a vibration mechanism.
Further, the concentration of the carbon dioxide in the carbon dioxide storage tank is 30-99.99%; the air pressure of the carbon dioxide entering the air chamber is 0.2-10 MPa; the speed of the liquid steel slag entering the air chamber through the feed inlet is 0.01-70 t/h; the processing time of the deep carbon quenching mechanism is 1-6 h; the treatment time of the first-stage carbon quenching unit is 10-60 min; the temperature of the molten steel slag in the steel slag barrel is 1350-1600 ℃.
A method for carbonizing steel slag by using carbon dioxide gas quenching comprises the following steps: the steel slag is subjected to carbon quenching in the device for carbonizing the steel slag by using carbon dioxide gas quenching through the carbon dioxide, and meanwhile, the heat is recycled through the carbon dioxide.
The fine-particle steel slag finished product prepared after air quenching and carbonization can recover part of pig iron resources to return to steel making for use, and the free f- (CaO + MgO) content is low, so that the fine-particle steel slag finished product can be used as aggregate and powder for paving asphalt pavements.
Compared with the prior art, the invention has the following advantages:
the method for quenching and carbonizing steel slag by using carbon dioxide provided by the invention can be used for carrying out regulation and control of carbon dioxide quenching granulation, carbonation of free f-CaO and f-MgO on the surface of molten steel slag, and building a demonstration project of carbon dioxide quenching and particle size regulation of steel slag with the treatment capacity of 100 ten thousand tons per year, so that the proportion of the particle size of the carbonated molten steel slag is controllable within the range of 2.5-5mm, the free f- (CaO + MgO) is less than 0.1%, and 260kg of carbon dioxide can be fixed in the carbonation process of 1 ton of steel slag through comprehensive measurement and calculation.
The method for carbonizing steel slag by using carbon dioxide gas quenching realizes that the steel slag is applied to the field of building materials after being carbonated, and simultaneously realizes the recovery heating or power generation of the heat energy of the steel slag.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic view of an apparatus for quenching carbonized steel slag by using carbon dioxide according to an embodiment of the present invention.
Description of reference numerals:
1. a steel slag bucket; 2. a carbon dioxide storage tank; 3. a deep carbon quenching mechanism; 4. a heat energy utilization mechanism; 5. carbonizing a tank body by steel slag; 31. a liquid slag chute; 32. a blower; 33. a grinding unit for the carbonated steel slag particle material; 34. a particulate material collector; 35. a pressure relief valve; 36. a power-assisted air nozzle; 331. a ball screw; 332. a support; 333. a crushing roller; 334. a rotating electric machine; 51. magnetic iron selection equipment; 52. a bin gate.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate a number of the indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
The utility model provides an utilize carbon dioxide gas quenching carbonization slag's device, includes slag ladle 1, carbon dioxide holding vessel 2, degree of depth carbon quenching mechanism 3, heat energy utilization mechanism 4, the slag carbonization jar body 5, slag ladle 1, carbon dioxide holding vessel 2 respectively through the pipeline with degree of depth carbon quench mechanism 3 link to each other, heat energy utilization mechanism 4 respectively through the pipeline with carbon dioxide holding vessel 2, degree of depth carbon quench mechanism 3 link to each other, degree of depth carbon quench mechanism 3 with the slag carbonization jar body 5 link to each other.
The deep carbon quenching mechanism 3 comprises a primary carbon quenching unit and a secondary carbon quenching unit, and the primary carbon quenching unit is connected with the secondary carbon quenching unit through a pipeline; the primary carbon quenching unit comprises an air chamber, a liquid slag chute 31, an air blower 32, a carbonated steel slag granular material crushing unit 33 and a granular material collector 34 are arranged in the air chamber, the air chamber is provided with a feed inlet, an air inlet and a discharge outlet, the feed inlet is connected with the steel slag barrel 1 through a pipeline, the feed inlet is positioned above the liquid slag chute 31, the air inlet is respectively connected with the carbon dioxide storage tank 2 and the blower 32 through pipelines, the liquid slag chute 31 is positioned above the blower 32, the grinding unit 33 of the carbonated steel slag granular material is positioned at one side of the blower 32, the particulate material collector 34 is located at one side of the grinding unit 33, and the particulate material collector 34 is connected to the discharge opening. The secondary carbon quenching unit comprises an air chamber, a liquid slag chute 31, an air blower 32, a carbonated steel slag granular material crushing unit 33 and a granular material collector 34 are arranged in the air chamber, the air chamber is provided with a feed inlet, an air inlet and a discharge outlet, the feed inlet is connected with the discharge outlet of the primary carbon quenching unit through a pipeline, the feeding hole is positioned above the liquid slag chute 31, the air inlet is respectively connected with the heat energy utilization mechanism 4 and the blower 32 through pipelines, the liquid slag chute 31 is positioned above the blower 32, the grinding unit 33 of the carbonated steel slag granular material is positioned at one side of the blower 32, the granular material collector 34 is positioned at one side of the carbonated steel slag granular material crushing unit 33, and the granular material collector 34 is connected with the discharge port; the top of the air chamber is provided with a plurality of power-assisted air nozzles 36, and the air inlets are respectively connected with the power-assisted air nozzles 36; the number of the power-assisted air nozzles 36 is more than 8; and a pressure release valve 35 is arranged on the air chamber.
The grinding unit 33 of the carbonated steel slag granular material comprises a bracket 332, the bracket 332 is positioned in the air chamber, a ball screw 331 is arranged on the bracket 332, the ball screw 331 is connected with a rotating motor 334, a crushing roller 333 is rotatably connected with a nut of the ball screw 331, and the crushing roller 333 is positioned on the bracket 332. The rotating motor 334 drives the ball screw 331 to operate, so that the crushing roller 333 reciprocates on the bracket 332 to crush the steel slag.
The top of the air chamber is provided with a plurality of power-assisted air nozzles 36, and the air inlets are respectively connected with the power-assisted air nozzles 36; the number of the power-assisted air nozzles 36 is 8; and a pressure release valve 35 is arranged on the air chamber. The heat energy utilization mechanism 4 is internally provided with a carbon dioxide supercritical power generation system and a conventional heat supply system.
The steel slag carbonization tank body 5 is provided with a bin gate plate 52. After the molten steel slag is subjected to carbon quenching step by step and waste heat exchange, the molten steel slag is cooled to a temperature below 400 ℃, collected by a particle material collector 34, sent out for magnetic iron selection and conveyed to a steel slag carbonization tank.
A stirrer and a steel slag collector are arranged in the steel slag carbonization tank body 5; the device for carbonizing steel slag by using carbon dioxide gas quenching further comprises a magnetic iron selection device 51, the deep carbon quenching mechanism 3 is connected with the magnetic iron selection device 51 through a pipeline, and the magnetic iron selection device 51 is connected with the steel slag carbonization tank body 5 through a pipeline. The length of the air chamber is 30m, and the width of the air chamber is 10 m; the interior of the particulate material collector 34 is provided with a vibrating mechanism. The steel slag carbonization tank body 5, the steel slag collector, the magnetic iron selection device 51, the vibration mechanism and the like adopt conventional commercially available equipment.
The concentration of the carbon dioxide in the carbon dioxide storage tank 2 is 30 percent; the air pressure of the carbon dioxide entering the air chamber is 1 MPa; the speed of the liquid steel slag entering the air chamber through the feed inlet is 0.1 t/h; the processing time of the deep carbon quenching mechanism 3 is 1 h; the treatment time of the first-stage carbon quenching unit is 30 min; the temperature of the molten steel slag in the steel slag barrel 1 is 1350-1600 ℃.
A method for carbonizing steel slag by using carbon dioxide gas quenching comprises the following steps: the steel slag is subjected to carbon quenching in the device for carbonizing the steel slag by using carbon dioxide gas quenching through the carbon dioxide, and meanwhile, the heat is recycled through the carbon dioxide.
The implementation process comprises the following steps:
firstly, starting an air blower 32 and a power-assisted air nozzle 36 of a first-stage carbon quenching unit to convey carbon dioxide, wherein the concentration is 30 percent, and the air pressure is 1 MPa; pouring a pot of liquid steel slag into the chute at the pouring rate of 0.1t/h, flowing to the tail end of the chute, carrying out fine granulation and controllable particle size on high-pressure carbon dioxide gas sent out by the combined effect of the air blower 32 and the power-assisted air nozzle 36, then conveying to a next-stage carbon quenching unit, and simultaneously carrying out heat exchange on residual heat of the molten steel slag and the carbon dioxide gas;
then, starting an air blower 32 and a power-assisted air nozzle 36 of the secondary carbon quenching unit, and introducing carbon dioxide gas with the pressure of 1MPa to carry out grain size controllable fine granulation and a steel slag waste heat and carbon dioxide gas heat exchange process on the molten steel slag from the primary carbon quenching unit again;
then, after the molten steel slag is subjected to carbon quenching step by step and waste heat exchange, cooling the molten steel slag to be below 400 ℃, sending out the molten steel slag for magnetic iron selection, and conveying the molten steel slag to a steel slag carbonization tank;
then, carrying out carbonation reaction on the fine-particle steel slag below 400 ℃ and carbon dioxide gas (the wind pressure is 1-1.5MPa) under the environment of 1-2MPa of pressure, and opening a bin gate plate 52 at the lower part of the steel slag carbonization tank after the residence time is 1-24h, and then sending out the steel slag from a discharge hole.
The liquid slag chute 31 and the air blower 32 are both arranged at the front end of the air chamber, and the air injection port of the air blower 32 is positioned below the tail end of the liquid slag chute 31, so that the liquid steel slag poured into the liquid slag chute 31 can be dispersed and flow out from the tail end of the liquid slag chute 31 in a good posture, and is fully contacted with high-pressure carbon dioxide sent out by the air blower 32, and meanwhile, reasonable gas flow field distribution is formed by a composite effect under the air supply action of the power-assisted air nozzle 36, so that the graded particle size treatment of the molten steel slag is realized; under the continuous and forced action of the multistage carbon quenching units, the fine-particle steel slag firstly avoids slag coagulation, forms fine steel slag with the particle size of 2-5mm, can be subsequently utilized as aggregate and powder finished products of building materials, and is favorable for collecting by a material collector and sending out magnetic iron selection from a discharge hole; in the step-by-step carbon quenching process of the molten steel slag, the waste heat of the molten steel slag exchanges heat with carbon dioxide in the environment, so that the molten steel slag is cooled within a certain time, and the high-temperature carbon dioxide is compressed and conveyed to a heat supply device; after the treatment of the steel slag carbonization tank with controllable pressure, the free state f- (CaO + MgO) on the surface of the fine-particle steel slag is less than 0.1 percent, and 260kg of carbon dioxide can be fixed in the carbonization process of 1 ton of fine-particle steel slag comprehensively. The carbon quenching-carbonizing device is used for processing the molten steel slag, the operation is simple, the processing is efficient, the engineering application prospect is good, the fine-particle steel slag finished product prepared after carbon quenching-carbonizing can recover part of pig iron resources to be returned for steelmaking, and the free f- (CaO + MgO) content is low, so that the fine-particle steel slag finished product can be used as aggregate and powder for paving an asphalt pavement.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A device for carbonizing steel slag by using carbon dioxide gas quenching is characterized in that: including slag ladle, carbon dioxide holding vessel, degree of depth carbon quenching mechanism, heat energy utilization mechanism, the slag carbonization jar body, slag ladle, carbon dioxide holding vessel respectively through the pipeline with degree of depth carbon quench the mechanism and link to each other, heat energy utilization mechanism respectively through the pipeline with carbon dioxide holding vessel, degree of depth carbon quench the mechanism and link to each other, degree of depth carbon quench the mechanism with the slag carbonization jar body link to each other.
2. The apparatus for carbonizing steel slag by using carbon dioxide gas quenching as claimed in claim 1, wherein: the deep carbon quenching mechanism comprises a plurality of stages of carbon quenching units, and the carbon quenching units are connected through pipelines.
3. The apparatus for carbonizing steel slag by using carbon dioxide gas quenching as claimed in claim 2, wherein: the deep carbon quenching mechanism comprises a primary carbon quenching unit and a secondary carbon quenching unit, and the primary carbon quenching unit is connected with the secondary carbon quenching unit through a pipeline;
the one-level carbon quenching unit comprises an air chamber, the inside of the air chamber is provided with a liquid slag chute, an air blower, a carbonated steel slag particle material crushing unit and a particle material collector, the air chamber is provided with a feed inlet, an air inlet and a discharge hole, the feed inlet is connected with a steel slag barrel through a pipeline, the feed inlet is positioned above the liquid slag chute, the air inlet is respectively connected with a carbon dioxide storage tank and the air blower through a pipeline, the liquid slag chute is positioned above the air blower, the carbonated steel slag particle material crushing unit is positioned on one side of the air blower, the particle material collector is positioned on one side of the carbonated steel slag particle material crushing unit, and the particle material collector is connected with the discharge hole.
4. The apparatus for carbonizing steel slag by using carbon dioxide gas quenching as claimed in claim 3, wherein: the secondary carbon quenching unit comprises an air chamber, a liquid slag chute, an air blower, a carbonated steel slag granular material crushing unit and a granular material collector are arranged in the air chamber, a feed inlet, an air inlet and a discharge outlet are formed in the air chamber, the feed inlet is connected with the discharge outlet of the primary carbon quenching unit through a pipeline, the feed inlet is positioned above the liquid slag chute, the air inlet is respectively connected with the heat energy utilization mechanism and the air blower through pipelines, the liquid slag chute is positioned above the air blower, the carbonated steel slag granular material crushing unit is positioned on one side of the air blower, the granular material collector is positioned on one side of the carbonated steel slag granular material crushing unit, and the granular material collector is connected with the discharge outlet; the top of the air chamber is provided with a plurality of power-assisted air nozzles, and the air inlets are respectively connected with the power-assisted air nozzles; the number of the power-assisted air nozzles is more than 8; and a pressure release valve is arranged on the air chamber.
5. The apparatus for carbonizing steel slag by using carbon dioxide gas quenching as claimed in claim 3, wherein: the grinding unit of the carbonated steel slag particle materials comprises a support, the support is located in the air chamber, a ball screw is arranged on the support and connected with a rotating motor, a crushing roller is rotationally connected with a nut of the ball screw, and the crushing roller is located on the support.
6. The apparatus for carbonizing steel slag by using carbon dioxide gas quenching as claimed in claim 3, wherein: the top of the air chamber is provided with a plurality of power-assisted air nozzles, and the air inlets are respectively connected with the power-assisted air nozzles; the number of the power-assisted air nozzles is more than 8; and a pressure release valve is arranged on the air chamber.
7. The apparatus for carbonizing steel slag by using carbon dioxide gas quenching as claimed in claim 1, wherein: the steel slag carbonization tank body is provided with a bin gate, and a stirrer and a steel slag collector are arranged inside the steel slag carbonization tank body; the device for carbonizing the steel slag by using the carbon dioxide gas quenching also comprises a magnetic iron selection device, wherein the deep carbon quenching mechanism is connected with the magnetic iron selection device through a pipeline, and the magnetic iron selection device is connected with the steel slag carbonization tank body through a pipeline.
8. The apparatus for carbonizing steel slag by using carbon dioxide gas quenching as claimed in claim 3, wherein: the length of the air chamber is 20-35m, and the width of the air chamber is 10 m; the inside of the particle material collector is provided with a vibration mechanism.
9. The apparatus for carbonizing steel slag by using carbon dioxide gas quenching as claimed in claim 3, wherein: the concentration of the carbon dioxide in the carbon dioxide storage tank is 30-99.99%; the air pressure of the carbon dioxide entering the air chamber is 0.2-10 MPa; the speed of the liquid steel slag entering the air chamber through the feed inlet is 0.01-70 t/h; the processing time of the deep carbon quenching mechanism is 1-6 h; the treatment time of the primary carbon quenching unit is 10-60 min; the temperature of the molten steel slag in the steel slag barrel is 1350-1600 ℃.
10. A method for carbonizing steel slag by using carbon dioxide gas quenching is characterized by comprising the following steps: the method comprises the following steps: the steel slag is carbon quenched by carbon dioxide in the device for carbonizing steel slag by carbon dioxide gas quenching according to any one of claims 1 to 9, and the heat is recycled by carbon dioxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210298248.5A CN114657291A (en) | 2022-03-24 | 2022-03-24 | Device and method for quenching carbonized steel slag by using carbon dioxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210298248.5A CN114657291A (en) | 2022-03-24 | 2022-03-24 | Device and method for quenching carbonized steel slag by using carbon dioxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114657291A true CN114657291A (en) | 2022-06-24 |
Family
ID=82031222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210298248.5A Pending CN114657291A (en) | 2022-03-24 | 2022-03-24 | Device and method for quenching carbonized steel slag by using carbon dioxide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114657291A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115365274A (en) * | 2022-09-20 | 2022-11-22 | 中南大学 | Method for improving steel slag grinding efficiency and iron resource recovery rate |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110982967A (en) * | 2019-12-25 | 2020-04-10 | 江西理工大学 | Method and device for realizing steel slag quenching and waste heat recovery by using water and carbon dioxide |
| CN111471817A (en) * | 2020-04-24 | 2020-07-31 | 河钢股份有限公司 | Gas quenching method for improving stability of steel slag and recovering physical heat of molten steel slag |
| CN212758874U (en) * | 2020-06-12 | 2021-03-23 | 浙江国森环保科技有限公司 | Screening device for incinerator slag |
| CN113718070A (en) * | 2021-09-30 | 2021-11-30 | 青岛达能环保设备股份有限公司 | CO2Steam-water combined quenching steel slag coupling carbon fixation and pressure hot stuffiness waste heat recovery system |
-
2022
- 2022-03-24 CN CN202210298248.5A patent/CN114657291A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110982967A (en) * | 2019-12-25 | 2020-04-10 | 江西理工大学 | Method and device for realizing steel slag quenching and waste heat recovery by using water and carbon dioxide |
| CN111471817A (en) * | 2020-04-24 | 2020-07-31 | 河钢股份有限公司 | Gas quenching method for improving stability of steel slag and recovering physical heat of molten steel slag |
| CN212758874U (en) * | 2020-06-12 | 2021-03-23 | 浙江国森环保科技有限公司 | Screening device for incinerator slag |
| CN113718070A (en) * | 2021-09-30 | 2021-11-30 | 青岛达能环保设备股份有限公司 | CO2Steam-water combined quenching steel slag coupling carbon fixation and pressure hot stuffiness waste heat recovery system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115365274A (en) * | 2022-09-20 | 2022-11-22 | 中南大学 | Method for improving steel slag grinding efficiency and iron resource recovery rate |
| CN115365274B (en) * | 2022-09-20 | 2024-05-28 | 中南大学 | Method for improving grinding efficiency of steel slag and recovery rate of iron resources |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110982967B (en) | Method and device for realizing steel slag quenching and waste heat recovery by using water and carbon dioxide | |
| CN101665845B (en) | Liquid blast furnace slag granulation method and device thereof | |
| CN102492790B (en) | Steel slag breaking treatment process and equipment | |
| CN102061350A (en) | Short-process comprehensive red mud utilization method and equipment | |
| CN112899420B (en) | Converter slag combined quenching alkali-removing magnetization heat recovery device and method | |
| CN111471817A (en) | Gas quenching method for improving stability of steel slag and recovering physical heat of molten steel slag | |
| CN103820588B (en) | The method that the broken molten blast furnace slag sensible heat of quenching dry type reclaims and device | |
| CN212270143U (en) | Blast furnace slag waste heat power generation system | |
| CN114657291A (en) | Device and method for quenching carbonized steel slag by using carbon dioxide | |
| CN104561405A (en) | Hot steel-making slag high-temperature solidification, pelletization and heat recovery method and equipment system thereof | |
| CN101886148A (en) | Method for recovering high-temperature molten slag | |
| EP4190919A1 (en) | Integrated drying process and device for dry granulated slag and sludge | |
| CN101886149A (en) | High temperature liquid slag recovery method | |
| CN115448623B (en) | Method for preparing cementing material by sintering and activating coal gangue | |
| CN104109742A (en) | Afterheat recycling system utilizing slag-granule-jetting molten-slag-crushing process | |
| CN101638703B (en) | Method for directly reducing nickel containing pig iron by lateritic nickel in tunnel kiln | |
| CN114229891B (en) | Device for preparing crystals through pyrolysis and magnetic separation and method for preparing zirconium oxide by using device | |
| CN101913784A (en) | Dry method granulating and waste heat recovering process of blast-furnace slag | |
| CN214193316U (en) | Liquid blast furnace slag dry-type granulation treatment device | |
| CN203728857U (en) | Quenching dry type recovery device for sensible heat of crushed molten blast furnace slag | |
| AU2022200483B1 (en) | Method for recovering valuable metal from high-zinc and high-lead smelting slag | |
| CN214529097U (en) | High-temperature liquid dilute slag air quenching granulation and waste heat recovery system | |
| CN201762342U (en) | Recovery device of waste heat of expansion slag bead | |
| CN201785404U (en) | Recovering system for high-temperate molten slag | |
| CN110066916B (en) | Method for reducing oxide minerals by using square carbonization chamber of coke-oven plant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220624 |
|
| RJ01 | Rejection of invention patent application after publication |