CN112321178B - Online continuous treatment method for molten titanium-containing blast furnace slag - Google Patents
Online continuous treatment method for molten titanium-containing blast furnace slag Download PDFInfo
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- CN112321178B CN112321178B CN202011222798.6A CN202011222798A CN112321178B CN 112321178 B CN112321178 B CN 112321178B CN 202011222798 A CN202011222798 A CN 202011222798A CN 112321178 B CN112321178 B CN 112321178B
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- 239000002893 slag Substances 0.000 title claims abstract description 198
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 133
- 239000010936 titanium Substances 0.000 title claims abstract description 133
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 132
- 238000000034 method Methods 0.000 title claims abstract description 56
- 238000002425 crystallisation Methods 0.000 claims abstract description 55
- 230000008025 crystallization Effects 0.000 claims abstract description 52
- 238000001816 cooling Methods 0.000 claims abstract description 36
- 238000010791 quenching Methods 0.000 claims abstract description 32
- 230000000171 quenching effect Effects 0.000 claims abstract description 32
- 238000012216 screening Methods 0.000 claims abstract description 18
- 238000005336 cracking Methods 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000000465 moulding Methods 0.000 claims abstract 2
- 238000010583 slow cooling Methods 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 239000006004 Quartz sand Substances 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 238000010924 continuous production Methods 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 2
- 230000005494 condensation Effects 0.000 claims description 2
- 230000003750 conditioning effect Effects 0.000 claims description 2
- 238000005496 tempering Methods 0.000 abstract description 34
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 239000011521 glass Substances 0.000 abstract description 4
- 230000005284 excitation Effects 0.000 abstract description 2
- 238000002844 melting Methods 0.000 abstract description 2
- 230000008018 melting Effects 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract description 2
- 238000005457 optimization Methods 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 description 29
- 230000001276 controlling effect Effects 0.000 description 22
- 239000003795 chemical substances by application Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000007664 blowing Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 229910000604 Ferrochrome Inorganic materials 0.000 description 3
- NWXHSRDXUJENGJ-UHFFFAOYSA-N calcium;magnesium;dioxido(oxo)silane Chemical compound [Mg+2].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O NWXHSRDXUJENGJ-UHFFFAOYSA-N 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 229910052637 diopside Inorganic materials 0.000 description 3
- 239000010436 fluorite Substances 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910052661 anorthite Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- QDOXWKRWXJOMAK-UHFFFAOYSA-N chromium(III) oxide Inorganic materials O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- GWWPLLOVYSCJIO-UHFFFAOYSA-N dialuminum;calcium;disilicate Chemical compound [Al+3].[Al+3].[Ca+2].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-] GWWPLLOVYSCJIO-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 210000004127 vitreous body Anatomy 0.000 description 1
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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
- 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
- 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
-
- 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
-
- 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)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Metallurgy (AREA)
- Structural Engineering (AREA)
- Furnace Details (AREA)
Abstract
The invention discloses an online continuous treatment method of molten titanium-containing blast furnace slag, which comprises the following steps: quenching and tempering the high-temperature liquid molten titanium-containing blast furnace slag; cooling and molding the quenched and tempered titanium-containing blast furnace slag; cooling the formed titanium-containing blast furnace slag for crystallization regulation; cracking the titanium-containing blast furnace slag after crystallization regulation and control to obtain a slag block; and screening the cracked slag blocks. The invention utilizes the strong self-crystallization capability of the titanium-containing blast furnace slag, and carries out component regulation and control, cooling temperature system control, crystallization optimization, stress excitation and the like on the molten titanium-containing blast furnace slag, thereby reducing the energy consumption in the process of cooling and melting the titanium-containing blast furnace slag, improving the crystalline phase composition of condensed slag blocks, reducing the content of a glass phase, simultaneously reducing the energy consumption in the process of crushing the slag blocks, having small floor area and small labor loss, and obtaining the titanium-containing blast furnace slag blocks used as building concrete aggregate, thereby realizing the large on-line treatment of the molten titanium-containing blast furnace slag.
Description
Technical Field
The invention relates to the technical field of blast furnace slag treatment, in particular to an online continuous treatment method for molten titanium-containing blast furnace slag.
Background
The titanium-containing blast furnace slag is high TiO produced by smelting vanadium titano-magnetite in China2The content of solid waste is relative to the common blast furnace slag, the titanium-containing blast furnace slag, especially the high titanium blast furnace slag due to high TiO2The content is such that it cannot be handled on a large scale as an additive for cement production, resulting in a large amount of accumulation. With the increasing strictness of the environmental protection requirements, large-scale titanium-containing blast furnace slag originally accumulated to mountain ditches and forest sides needs to be treated urgently, and newly produced titanium-containing blast furnace slag also needs to be treated "on line" urgently to avoid causing environmental pollution, so that an effective and large-scale approach for treating the titanium-containing blast furnace slag is required to be explored.
At present, in view of the current situation that titanium-containing blast furnace slag cannot be used in a large amount in the cement industry, the patent with the application number of 201310579305.8 and the invention name of 'process for producing broken stone or sand for construction by using high titanium type blast furnace slag' proposes that the high titanium blast furnace slag generated by blast furnace smelting is directly piled into a dry slag pit, is cooled by water beating, is laid flat and is overlaid, is crystallized by utilizing the self-crystallization capacity of the titanium-containing blast furnace slag, and is converted into a crystal structure by a vitreous body; and further crushing by using a bulldozer and an excavator, and then finely crushing and screening by using a crusher to prepare the slag crushed stone. The process is a mode for processing the titanium-containing blast furnace slag on a large scale at present, but has the problems of large occupied area in the dry slag processing process, uncontrollable crystallization degree in the cooling process, large crushing labor amount in the later period, high energy consumption and the like.
The patent with the application number of 200810306067.2 provides a cooling treatment method of high-titanium blast furnace slag, which comprises the steps of turning over the blast furnace slag discharged from a furnace to cool the blast furnace, turning over the slag to ensure that the thickness of a slag layer is less than or equal to 30cm, naturally cooling the blast furnace slag in the air for 30-50 min, then watering the blast furnace slag to ensure that the water is accumulated on the surface of the blast furnace slag by 0.8-1.2 cm, and naturally evaporating the water to dryness; and (4) when the red residues are remained after the water is pumped, supplementing water to the red residues, and naturally evaporating the accumulated water to dryness. The process provides a cooling mode of the thermal high titanium blast furnace slag, but the slag needs to be transported when the slag turning treatment is carried out, so that the treatment procedures are increased; on the other hand, pure water treatment, water consumption is large, and heat in the slag is completely wasted.
From the above, the conventional method for preparing the building macadam by cooling the hot titanium-containing blast furnace slag has some defects in the aspects of treatment process, energy consumption and crystallization behavior control. Therefore, it is urgently needed to provide a new process treatment method, which improves the efficiency of online treatment of the molten titanium-containing blast furnace slag and the effectiveness of process control.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an online continuous treatment method for molten titanium-containing blast furnace slag.
In order to achieve the above object, an embodiment of the present invention provides the following technical solutions:
an on-line continuous treatment method of molten titanium-containing blast furnace slag comprises the following steps:
s1: quenching and tempering the high-temperature liquid molten titanium-containing blast furnace slag;
s2: cooling and forming the quenched and tempered titanium-containing blast furnace slag;
s3: performing crystallization regulation on the cooled and formed titanium-containing blast furnace slag;
s4: cracking the titanium-containing blast furnace slag after crystallization regulation to obtain a slag block;
s5: and screening the cracked slag blocks.
In a further improvement of the present invention, in step S1, a conditioner is added to the molten titanium-containing blast furnace slag and heated to perform conditioning.
As a further improvement of the invention, the heating is carried out to 1450-1550 ℃.
In a further improvement of the present invention, in step S2, the cooling forming is performed by controlling the thickness of the titanium-containing blast furnace slag.
As a further improvement of the invention, the forming thickness of the titanium-containing blast furnace slag is controlled to be 0-50 mm.
As a further improvement of the invention, in step S3, the crystallization of the titanium-containing blast furnace slag is controlled by slow cooling.
As a further improvement of the invention, the titanium-containing blast furnace slag is slowly cooled to below 650 ℃.
As a further improvement of the present invention, in step S4, the titanium-containing blast furnace slag is cracked by strong wind quenching or high-pressure water quenching.
As a further improvement of the invention, the titanium-containing blast furnace slag is quenched to below 50 ℃.
As a further improvement of the present invention, in step S5, the slag blocks meeting the requirement of particle size are sieved out, and the slag blocks with larger size are subjected to off-line mechanical crushing treatment.
The invention has the beneficial effects that:
the invention improves and optimizes the processing method of the titanium-containing blast furnace slag, comprises the working procedures of quenching and tempering, cooling and forming, crystallization regulation and control, quenching and cracking, sieving and the like of the molten titanium-containing blast furnace slag, utilizes the strong self-crystallization capability of the titanium-containing blast furnace slag, by carrying out component regulation and control, cooling temperature schedule control, crystallization optimization, stress excitation and the like on the molten titanium-containing blast furnace slag, the energy consumption in the process of cooling and melting the titanium-containing blast furnace slag is reduced, the crystalline phase composition of condensed slag blocks is improved, the content of a glass phase is reduced, meanwhile, the energy consumption in the process of crushing the slag blocks is reduced, the self-cracking of the titanium-containing blast furnace slag is realized, the problems of large occupied area of a dry slag pit, large labor loss and the like in the traditional treatment process are avoided, the titanium-containing blast furnace slag blocks used as building concrete aggregate are obtained, thereby realizing the massive 'on-line' treatment of the titanium-containing blast furnace slag and solving the problems of large-area accumulation and environmental pollution.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic block diagram of a processing system in accordance with a preferred embodiment of the present invention;
fig. 2 is a flow chart of a preferred embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in FIG. 1, the processing system for implementing the online continuous processing method of molten titanium-containing blast furnace slag comprises a blast furnace 1, a tempering furnace 2, a crystallization regulating furnace 3 and a screening device 4, wherein the tempering furnace 2 comprises a tempering furnace body 21, a feeding pipe 22 and a heating device, the feeding pipe 22 and the heating device are arranged on the tempering furnace body 21, the tempering furnace body 21 is communicated with the blast furnace 1, so that high-temperature liquid molten titanium-containing blast furnace slag discharged by the blast furnace 1 enters the tempering furnace body 21, a tempering agent is conveniently added into the tempering furnace body 21 through the feeding pipe 22, the adjusted molten titanium-containing blast furnace slag component is realized to achieve the effects of controlling and optimizing the crystalline phase in the crystallization process, and the heating device is matched to ensure that the molten titanium-containing blast furnace slag has sufficient fluidity, so that the tempering uniformity is enhanced, and the crystallization regulating furnace 3 comprises a crystallization regulating furnace body 31 and a thickness regulating device arranged in the crystallization regulating furnace body 31, The crystallization regulating and controlling furnace body 31 is respectively communicated with the tempering furnace body 21 and the screening device 4, the thickness of the tempered titanium-containing blast furnace slag is controlled by the thickness regulating device, the cooling efficiency is enhanced, the crystallization regulating and controlling effect is enhanced, a powerful condition can be provided for the secondary crushing process of reducing the size of the building concrete aggregate meeting the industrial requirements after self-cracking is obtained, the temperature is reduced by the slow cooling device in the process of passing through the thickness regulating device, the effects of cooling the thickness regulating device and reducing the temperature of the gradually condensed titanium-containing blast furnace slag are achieved, the condensed titanium-containing blast furnace slag is gradually crystallized in the crystallization regulating and controlling furnace body 31 in the advancing process along with the conveying device, the strength is improved, the cooling is enhanced at the position of the fast cooling device, the internal stress in the cooling and crystallizing process of the molten titanium-containing blast furnace slag is excited, and the slag is cracked by corresponding self-cracking, meanwhile, the temperature of the finally obtained aggregate is reduced through cooling, the cooled blocky blast furnace slag is screened through the screening device 12, the slag blocks meeting the granularity requirement are screened out, and the blocky blast furnace slag with larger size can be subjected to offline crushing treatment.
According to the invention, the quenching and tempering furnace body 21 is preferably communicated with the blast furnace 1 through the slag runner 5, so that the liquid molten titanium-containing blast furnace slag discharged from the blast furnace 1 can quickly enter the quenching and tempering furnace body 21.
The method detects the components and the temperature of the tempering furnace body 21 in real time, and preferably adds a certain amount of tempering agent into the tempering furnace body 21 through a top blowing mode by a feeding pipe 22 for proper tempering according to the requirements of final products.
According to the invention, the preferable heating device is the gas spray gun 23, and according to the detection result of the temperature, the gas spray gun 23 is used for spraying and blowing the fuel into the tempering furnace body 21 for heating treatment, so that the liquid molten titanium-containing blast furnace slag and the tempering agent are fully and uniformly mixed, and the condition and the temperature of the blast furnace slag meet the requirements when the blast furnace slag enters the crystallization regulating and controlling furnace body 31 is ensured.
In order to facilitate the quenched and tempered blast furnace slag to rapidly enter the quenching and tempering furnace body 21 and accelerate the processing speed, the quenching and tempering furnace body 21 is preferably communicated with the crystallization regulating and controlling furnace body 31 through the guide pipe 6.
The preferable thickness adjusting device of the present invention includes at least one roller 32, and the thickness of the blast furnace slag can be adjusted by adjusting the height of the roller 32 in the crystallization regulating furnace body 31.
More preferably, the number of the rolls 32 is plural, and the plural rolls 32 are arranged side by side along the length direction of the crystallization regulating furnace body 31, so that the thickness of the blast furnace slag can be quickly regulated.
The thickness of the blast furnace slag is controlled to be 0-50mm by the optimized thickness adjusting device.
The optimized slow cooling device comprises at least one slow cooling air pipe 33, and cold air is blown through the slow cooling air pipe 33 to cool the roller 32 and gradually condense the titanium-containing blast furnace slag, and meanwhile, hot air formed by heat released in the cooling process of the roller 32 and the titanium-containing blast furnace slag can flow in the crystallization regulating and controlling furnace body 31, so that a certain temperature is kept in the crystallization regulating and controlling furnace body 31, a constant temperature area or a slow cooling area is locally formed, and the slag body is fully regulated and controlled by heat treatment, so that the full crystallization of the titanium-containing blast furnace slag is promoted, the crystallization effect is improved, and the content of a glass phase is reduced.
In order to facilitate the cooling of the roller 32 by the cold air blown by the slow cooling air duct 33, the slow cooling air duct 33 is preferably located above the roller 32.
The quenching device preferably comprises at least one quenching air pipe 34, strong cold air is blown out through the quenching air pipe 34, on one hand, the internal stress in the cooling crystallization process of the molten blast furnace slag is excited through enhanced cooling, namely, the internal stress is rapidly released by utilizing the residual stress existing in the crystallization heat treatment process of the blast furnace slag and is subjected to corresponding self-cracking by controlling the cooling strength, so that the slag block meeting the granularity requirement is obtained; on the other hand, the temperature of the finally obtained aggregate is lowered by terminal cooling.
In order to facilitate the transportation of the blast furnace slag, the preferred transportation device of the invention comprises a plurality of transportation rollers 35 and a bearing plate 36 matched with the plurality of transportation rollers 35, wherein the plurality of transportation rollers 35 are arranged side by side along the length direction of the crystallization regulating and controlling furnace body 31. It is further preferred that the carrier plate 36 be a chaining plate.
As shown in FIG. 2, the invention discloses an online continuous treatment method of molten titanium-containing blast furnace slag, which comprises the following steps:
s1: quenching and tempering the high-temperature liquid molten titanium-containing blast furnace slag;
s2: cooling and forming the quenched and tempered titanium-containing blast furnace slag;
s3: performing crystallization regulation on the cooled and formed titanium-containing blast furnace slag;
s4: cracking the titanium-containing blast furnace slag after crystallization regulation to obtain a slag block;
s5: and screening the cracked slag blocks.
In one embodiment, step S1 is specifically: adding a quenching and tempering agent into the molten titanium-containing blast furnace slag, and heating for quenching and tempering. The conditioner can adjust the components of the molten titanium-containing blast furnace slag, and on the one hand, the conditioner can improve SiO2The content is increased to more than 30 percent; on the other hand, by adding crystallization-regulating components, e.g. CaF2、Cr2O3The adding mode can be added through other solid waste resources, so that the aim of comprehensively utilizing various solid waste resources is fulfilled; the heating can ensure the fluidity of the molten titanium-containing blast furnace slag, so that the molten titanium-containing blast furnace slag and the quenching and tempering agent are uniformly mixed, and the quenching and tempering uniformity is improved, so as to obtain the components meeting the crystal phase requirements of the target slag blocks.
More specifically, in step S1, the modifying agent is one or more of quartz sand, alumina powder, tailings, and the amount of the modifying agent is within 25% of the total weight, where the total weight refers to the weight of the modifying agent and the molten titanium-containing blast furnace slag.
More specifically, in step S1, the temperature is increased to 1450-.
In one embodiment, step S2 is specifically: and cooling and forming by controlling the thickness of the titanium-containing blast furnace slag. The cooling efficiency can be enhanced and the crystallization regulation and control effect can be enhanced by controlling the thickness of the titanium-containing blast furnace slag, and meanwhile, a powerful condition is provided for obtaining the building concrete aggregate which meets the industrial requirements after self-cracking and reducing the secondary crushing process.
More specifically, the thickness of the titanium-containing blast furnace slag is controlled to be 0-50 mm.
In one embodiment, step S3 is specifically: and carrying out crystallization regulation and control on the titanium-containing blast furnace slag through slow cooling. The temperature reduction and condensation of the titanium-containing blast furnace slag are realized through slow cooling, the condensed titanium-containing blast furnace slag gradually crystallizes in the crystallization regulating and controlling furnace body 31 in the process of advancing along with the conveying roller 35 on the bearing plate 36, the strength of the crystallization regulating and controlling furnace body is improved, the heat released in the cooling process of the titanium-containing blast furnace slag forms a constant temperature area or a slow cooling area locally, the temperature is reduced to be below 800 ℃ through off-line measurement in the same process, the heat is preserved for 2 hours, the heat treatment regulation and control are carried out on the titanium-containing blast furnace slag, the titanium-containing blast furnace slag is completely crystallized, the crystallization effect is improved, and the content of a glass phase is reduced.
More specifically, the titanium-containing blast furnace slag is gradually cooled to 650 ℃ or lower.
In one embodiment, step S4 is specifically: the titanium-containing blast furnace slag is cracked by strong wind quenching or high-pressure water quenching. Residual stress in the crystallization heat treatment process of the titanium-containing blast furnace slag can be excited through quenching, so that internal stress is rapidly released, a cracking effect is achieved, the titanium-containing blast furnace slag is cracked to obtain slag blocks, the process energy consumption and the site occupation area for performing off-line mechanical crushing on large titanium-containing blast furnace slag blocks are effectively reduced, and meanwhile, the temperature of finally obtained aggregates can also be reduced.
More specifically, the titanium-containing blast furnace slag is quenched to 50 ℃ or lower.
In one embodiment, step S5 is specifically: screening out the slag blocks meeting the requirement of the particle size, and carrying out off-line mechanical crushing treatment on the slag blocks with larger sizes.
For further understanding of the present invention, an on-line continuous process for treating molten titanium-containing blast furnace slag according to the present invention will be described in detail with reference to examples.
Example 1
(1) High-temperature liquid molten titanium-containing blast furnace slag discharged from the blast furnace 1 enters the quenching and tempering furnace body 21 through the slag runner 5;
(2) in a quenching and tempering furnace body 21, 6 percent of quartz sand, 3 percent of alumina powder, 0.5 percent of fluorite tailings and 0.5 percent of ferrochrome slag are added in a top blowing mode through a feeding pipe 22, and a gas spray gun 23 is heated to 1450 ℃ through combustion;
(3) the quenched and tempered titanium-containing blast furnace slag enters a crystallization regulating and controlling furnace body 31 through a flow guide pipe 6, the thickness of the titanium-containing blast furnace slag is controlled by a roller 32 to be 10mm, and a conveying roller 35 drives a bearing plate 36 to convey the titanium-containing blast furnace slag;
(4) in the process of passing through the roller 32, the slow cooling air pipe 33 blows air to slowly cool the roller 32 and the titanium-containing blast furnace slag, crystallization is gradually carried out in the crystallization regulating and controlling furnace body 31, a constant temperature area or a slow cooling area is formed in the local part of the heat released in the cooling process of the titanium-containing blast furnace slag, the heat treatment regulation and control of the titanium-containing blast furnace slag are realized, the temperature is reduced to 770-fold 800 ℃ through off-line measurement in the same process, the heat preservation is carried out for 2 hours, the crystallization degree reaches 83.59%, the main crystal phase mainly comprises perovskite and diopside, and then slow cooling is carried out to 620-fold 650 ℃;
(5) the slowly cooled titanium-containing blast furnace slag on the bearing plate 36 moves forward along with the conveying roller 35 to reach the quenching air pipe 34, and is rapidly and intensively cooled to be quenched below 50 ℃;
(6) and screening the cooled and cracked slag blocks in a screening device 5, screening the slag blocks meeting the particle size requirement, and performing off-line mechanical crushing treatment on the slag blocks with larger sizes.
Example 2
(1) High-temperature liquid molten titanium-containing blast furnace slag discharged from the blast furnace 1 enters the quenching and tempering furnace body 21 through the slag runner 5;
(2) 13 percent of quartz sand, 5 percent of alumina powder, 1 percent of fluorite tailings and 1 percent of ferrochrome slag are added into a quenching and tempering furnace body 21 by a feeding pipe 22 in a top blowing mode, and a gas spray gun 23 is heated to 1500 ℃ by combustion;
(3) the quenched and tempered titanium-containing blast furnace slag enters a crystallization regulating and controlling furnace body 31 through a flow guide pipe 6, the thickness of the titanium-containing blast furnace slag is controlled by a roller 32 to be 30mm, and a conveying roller 35 drives a bearing plate 36 to convey the titanium-containing blast furnace slag;
(4) in the process of passing through the roller 32, the slow cooling air pipe 33 blows air to slowly cool the roller 32 and the titanium-containing blast furnace slag, crystallization is gradually carried out in the crystallization regulating and controlling furnace body 31, a constant temperature area or a slow cooling area is formed in the local part by the heat released in the cooling process of the titanium-containing blast furnace slag, the heat treatment regulation and control of the titanium-containing blast furnace slag are realized, the temperature is reduced to 740-phase 770 ℃ through off-line measurement in the same process, the temperature is kept for 2 hours, the crystallization degree reaches 89.01 percent, the main crystalline phase is mainly diopside, and then slow cooling is carried out to 590-phase 620 ℃;
(5) the slowly cooled titanium-containing blast furnace slag on the bearing plate 36 moves forward along with the conveying roller 35 to reach the quenching air pipe 34, and is rapidly and intensively cooled to be quenched below 50 ℃;
(6) and screening the cooled and cracked slag blocks in a screening device 5, screening the slag blocks meeting the particle size requirement, and performing off-line mechanical crushing treatment on the slag blocks with larger sizes.
Example 3
(1) High-temperature liquid molten titanium-containing blast furnace slag discharged from the blast furnace 1 enters the quenching and tempering furnace body 21 through the slag runner 5;
(2) in a quenching and tempering furnace body 21, 16 percent of quartz sand, 7 percent of alumina powder, 1 percent of fluorite tailings and 1 percent of ferrochrome tailings are added in a top blowing mode through a feeding pipe 22, and a gas spray gun 23 is used for heating to 1550 ℃ through combustion;
(3) the quenched and tempered titanium-containing blast furnace slag enters a crystallization regulating and controlling furnace body 31 through a flow guide pipe 6, the thickness of the titanium-containing blast furnace slag is controlled by a roller 32 to be 50mm, and a conveying roller 35 drives a bearing plate 36 to convey the titanium-containing blast furnace slag;
(4) in the process of passing through the roller 32, the slow cooling air pipe 33 blows air to slowly cool the roller 32 and the titanium-containing blast furnace slag, crystallization is gradually carried out in the crystallization regulating and controlling furnace body 31, a constant temperature area or a slow cooling area is formed in the local part of the heat released in the cooling process of the titanium-containing blast furnace slag, the heat treatment regulation and control of the titanium-containing blast furnace slag are realized, the temperature is reduced to 710-charge 740 ℃ through off-line measurement in the same process, the temperature is kept for 2 hours, the crystallization degree reaches 83.35%, the main crystal phase mainly comprises anorthite and diopside, and then slow cooling is carried out to 560-charge 590 ℃;
(5) the condensed titanium-containing blast furnace slag gradually crystallizes in the crystallization regulating and controlling furnace body 31 in the process that the condensed titanium-containing blast furnace slag advances on the bearing plate 36 along with the conveying roller 35, the heat released in the cooling process of the titanium-containing blast furnace slag forms a constant temperature area or a slow cooling area locally, the heat treatment regulation and control are carried out on the titanium-containing blast furnace slag, the titanium-containing blast furnace slag is completely crystallized, and the titanium-containing blast furnace slag is rapidly and intensively cooled to be quenched below 50 ℃ when reaching the quenching air pipe 34;
(6) and screening the cooled and cracked slag blocks in a screening device 5, screening the slag blocks meeting the particle size requirement, and performing off-line mechanical crushing treatment on the slag blocks with larger sizes.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The on-line continuous treatment method of the molten titanium-containing blast furnace slag is characterized by comprising the following steps:
s1: adding a conditioner into high-temperature liquid molten titanium-containing blast furnace slag, heating for conditioning, wherein the conditioner is one or more of quartz sand, alumina powder, tailings and tailings, and the addition of the conditioner accounts for 25% of the total weight;
s2: cooling and molding the quenched and tempered titanium-containing blast furnace slag by controlling the thickness of the titanium-containing blast furnace slag;
s3: the cooled and formed titanium-containing blast furnace slag is crystallized and controlled through slow cooling, the temperature reduction and condensation of the titanium-containing blast furnace slag are realized through the slow cooling, the condensed titanium-containing blast furnace slag is gradually crystallized in a crystallization and control furnace body in the process of advancing along with a conveying roller on a bearing plate, heat released in the cooling process of the titanium-containing blast furnace slag forms a constant temperature area or a slow cooling area locally, the temperature is reduced to be below 800 ℃, and the temperature is kept for 2 hours;
s4: cracking the titanium-containing blast furnace slag after crystallization regulation to obtain a slag block;
s5: and screening the cracked slag blocks.
2. The method as claimed in claim 1, wherein the molten titanium-containing blast furnace slag is heated to 1450-1550 ℃.
3. The on-line continuous process for treating molten titanium-containing blast furnace slag according to claim 1, wherein the formed thickness of the titanium-containing blast furnace slag is controlled to be 0 to 50 mm.
4. The method of claim 1, wherein the molten titanium-containing blast furnace slag is gradually cooled to 650 ℃ or lower.
5. The on-line continuous process for treating molten titanium-containing blast furnace slag according to claim 1, wherein in step S4, the titanium-containing blast furnace slag is cracked by strong wind quenching or high pressure water quenching.
6. The method of claim 5, wherein the molten titanium-containing blast furnace slag is quenched to 50 ℃ or lower.
7. The method of claim 1, wherein in step S5, the slag blocks with the required particle size are screened out and the slag blocks with larger size are mechanically crushed off-line.
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