CN111850193A - Online quenching and tempering device and method for slag discharging and cooling process of molten steel slag - Google Patents
Online quenching and tempering device and method for slag discharging and cooling process of molten steel slag Download PDFInfo
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- 239000002893 slag Substances 0.000 title claims abstract description 294
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 219
- 239000010959 steel Substances 0.000 title claims abstract description 219
- 238000000034 method Methods 0.000 title claims abstract description 53
- 230000008569 process Effects 0.000 title claims abstract description 35
- 238000005496 tempering Methods 0.000 title claims abstract description 35
- 238000001816 cooling Methods 0.000 title claims abstract description 30
- 238000010791 quenching Methods 0.000 title claims abstract description 30
- 230000000171 quenching effect Effects 0.000 title claims abstract description 30
- 238000007599 discharging Methods 0.000 title claims abstract description 22
- 239000003607 modifier Substances 0.000 claims abstract description 33
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000010079 rubber tapping Methods 0.000 claims abstract description 22
- 230000000694 effects Effects 0.000 claims abstract description 13
- 229910052742 iron Inorganic materials 0.000 claims abstract description 13
- 238000011084 recovery Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims description 70
- 239000003795 chemical substances by application Substances 0.000 claims description 43
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 29
- 229910052791 calcium Inorganic materials 0.000 claims description 29
- 239000011575 calcium Substances 0.000 claims description 29
- 239000000463 material Substances 0.000 claims description 24
- 239000003638 chemical reducing agent Substances 0.000 claims description 22
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 21
- 229910052710 silicon Inorganic materials 0.000 claims description 21
- 239000010703 silicon Substances 0.000 claims description 21
- 238000012986 modification Methods 0.000 claims description 18
- 230000004048 modification Effects 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 230000009467 reduction Effects 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 11
- 239000007921 spray Substances 0.000 claims description 10
- 238000003723 Smelting Methods 0.000 claims description 8
- 238000009628 steelmaking Methods 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000000292 calcium oxide Substances 0.000 claims description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 4
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 2
- 238000007670 refining Methods 0.000 claims 4
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 239000002918 waste heat Substances 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 13
- 238000000227 grinding Methods 0.000 description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 8
- 239000000843 powder Substances 0.000 description 7
- 238000011161 development Methods 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 238000007885 magnetic separation Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- 235000012241 calcium silicate Nutrition 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000000265 homogenisation Methods 0.000 description 3
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000006011 modification reaction Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 2
- 235000019976 tricalcium silicate Nutrition 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000000378 calcium silicate Substances 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
- 230000008859 change Effects 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
-
- 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
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
-
- 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
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
-
- 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
- C21B2400/05—Apparatus features
- C21B2400/052—Apparatus features including rotating parts
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/066—Receptacle features where the slag is treated
- C21B2400/07—Receptacle features where the slag is treated open to atmosphere
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to an on-line quenching and tempering device and method in the slag discharging and cooling process of molten steel slag. And then the modified steel slag after the reaction is subjected to water cooling to a certain temperature, and finally the hot stuffiness treatment is carried out. The modifier is added in the slag tapping process of the molten steel slag, the steel slag is modified by quenching and tempering under the condition of not providing an external heat source, and the waste heat resource of the molten steel slag is fully utilized. The method has the advantages that the steel slag components are regulated and controlled from the root, the recovery rate of metallic iron in the steel slag can be improved, the content of the metallic iron in the tailings is reduced, the recovery rate of the metallic iron in the steel slag is greatly improved, the grindability of the steel slag is improved, the activity index of the steel slag is obviously improved, the realization of the resource utilization of all the steel slag is facilitated, and the method has great economic and social benefits.
Description
Technical Field
The invention relates to an online quenching and tempering device and method for a molten steel slag tapping cooling process, in particular to an online quenching and tempering device and method for a molten steel slag tapping cooling process generated in a production process of a steel enterprise.
Background
China is a big country for steel production, and in recent years, the steel yield exceeds 9 hundred million tons and accounts for more than half of the world. The steel slag is a necessary product in the steel-making process, 120-140 kg of steel slag is usually generated in each ton of steel smelting, and the total national annual output is more than 1 hundred million tons. The main chemical components of the steel slag comprise CaO and SiO2、FeO、Fe2O3The content of CaO in the ordinary converter steel slag is about 40 percent, and the content of SiO in the ordinary converter steel slag is about 40 percent215-20%, iron oxide content is 20-25%, and in addition, residual steel and other substances are about 10%. Therefore, the steel slag contains a large amount of calcium silicate materials and iron elements, and has great resource utilization value.
The residual steel in the steel slag can be partially recycled through crushing, screening and magnetic separation, the recycled waste steel and magnetic separation powder are returned to a smelting process, but the residual steel slag with the content of about 80 percent cannot be utilized with high added value. The steel slag which cannot be utilized flows into the field of building materials such as cement and the like at a very low price, most of the steel slag still needs to be discarded or stockpiled, occupies land, pollutes soil and water systems, and seriously threatens the ecological environment and the life safety of residents. The large amount of steel slag cannot be effectively utilized and dumped, so that the environment is seriously polluted, and the resource is seriously wasted, and a new technology is urgently required to be developed to improve the resource utilization value and realize the full resource utilization.
The steel slag resource utilization mainly comprises two aspects of steel slag powder and steel slag mixture. The steel slag mixture is mainly used in the building fields of roads, brickmaking and the like and is used for replacing a sandstone mixture. Because the stability problem of the steel slag can not be thoroughly solved, the prior steel slag mixture can only replace a small amount of sandstone and can not be used as concrete, and therefore, the resource utilization of the steel slag is mainly steel slag powder. The steel slag powder mainly utilizes hydraulic gelling substances such as dicalcium silicate, tricalcium silicate and the like in the steel slag to serve as an admixture of cement and concrete, can reduce the using amount of the cement and reduce the construction cost, and is a main approach for large-scale resource utilization of the steel slag at present.
At present, the capacity of the steel slag powder related production line in China exceeds 1000 million tons, but the production is limited by the problems of steel slag activity, production cost and the like, the related production line does not achieve the production basically, and the actual yield is only millions of tons. The main reasons influencing the production and application of the steel slag powder are that the steel slag has high hardness, high grinding production cost and low activity, and the sale price is low. The iron element in the steel slag is the main reason influencing the high production cost and low activity of steel slag grinding. After magnetic separation, the steel slag still contains more than 1% of metallic iron, and the metallic iron is a key factor causing difficult grinding and high energy consumption of the steel slag. The presence of iron oxide content of about 20% in steel slag results in a much lower proportion of dicalcium silicate, tricalcium silicate than cement and a crystalline, dense, often only about 70% active.
In order to reduce the grinding energy consumption of the steel slag and improve the activity of the steel slag, a large amount of work is carried out by a research institution, and the research institution mainly comprises three aspects of process equipment optimization, medicament development and quenching, tempering and modifying. The technological equipment is developed with steel slag grinding technological equipment including vertical mill, horizontal roller mill, etc. and has improved equipment and technological measures, such as reinforced magnetic separation to reduce the content of metal iron, high efficiency superfine grinding to raise specific surface area, etc. In the aspect of medicament development, for example, methods for developing grinding aids to reduce the energy consumption of steel slag grinding, developing active activators to improve the grinding strength of the steel slag and the like are developed. At present, the improvement effects on the reduction of the production cost and the improvement of the activity of the steel slag powder are not obvious through the work of two aspects of process equipment optimization and medicament development. The quenching and tempering modification is to add a modifier into the steel slag, adjust the chemical components of the steel slag and reconstruct the mineral composition of the steel slag, thereby changing the mineral composition of the steel slag and radically improving the property of the steel slag. The quenching and tempering modification treatment can reduce the content of iron element in the steel slag, improve the content of active substances in the steel slag, improve the grindability of the steel slag, greatly improve the activity index of the steel slag and have higher technical development value.
The existing tempering and modifying treatment is usually reduction and modifier addition tempering under laboratory conditions. The quenching, tempering and modifying operation is basically that materials such as steel slag, a reducing agent, a modifying agent and the like are crushed to a certain granularity and mixed uniformly under a cold condition, then the materials are heated to a high temperature condition of more than 1300 ℃, and heat preservation is carried out to provide a certain reaction homogenization time. However, the energy cost is estimated to be too high when the modification treatment mode is adopted for production under actual industrial conditions, and economic feasibility is not achieved. Therefore, the development of a process technology for the on-line modification treatment of the molten steel slag is urgently needed, the efficient quenching and tempering modification of the steel slag is realized under the condition of lower energy cost by utilizing the temperature condition that the slag tapping of the steel slag reaches 1600 ℃, and the complete resource utilization of the steel slag is realized.
According to the invention, the modifier is added in the slag tapping process of the molten steel slag, the steel slag is subjected to quenching and tempering modification under the condition of not providing an external heat source, and the waste heat resource of the molten steel slag is fully utilized. A special quenching and tempering modification device is adopted to carry out quenching and tempering homogenization treatment on the materials, and secondary homogenization is carried out by using steel slag pretreatment crushing equipment in cooperation, so that the full implementation of quenching, tempering and modification reaction is ensured. The method radically regulates and controls the components of the steel slag, can improve the recovery rate of metallic iron in the steel slag, reduce the content of metallic iron in tailings, greatly improve the grindability of the steel slag, obviously improve the activity index of the steel slag, facilitate the realization of the resource utilization of all the steel slag, and have great economic and social benefits.
Disclosure of Invention
In order to solve the technical problems, the invention provides an online quenching and tempering device for a molten steel slag deslagging cooling process, which comprises: the slag-tap changer comprises a steel smelting furnace (1), a slag outlet (2), a steel slag tank (3), a reducing agent bin (4), a calcium agent bin (5), a silicon agent bin (6), a mixing bin (7), a feeder (8), a mixing bed (9), a feeding port (10), a mixer (11), a water spray nozzle (12), a discharging port (13), a slag receiving tank (14) and a hot stuffy tank (16); the slag outlet (2) is arranged above the side part of the steel making furnace (1); the reducing agent bin (4), the calcium agent bin (5) and the silicon agent bin (6) are arranged above the mixing bin (7) in parallel, a feeder (8) is arranged below the mixing bin (7) and used for mixing materials in the reducing agent bin (4), the calcium agent bin (5) and the silicon agent bin (6) through the mixing bin (7) and then feeding the materials into the feeder (8), and the steel slag pot (3) can move between a first position and a second position, wherein the first position is a position where the steel slag pot (3) is located below the feeder (8) and the slag outlet (2) and used for enabling molten steel slag in the steel smelting furnace (1) to be poured into the steel slag pot (3) through the slag outlet (2) and simultaneously feeding the materials in the feeder (8) into the steel slag pot (3); the second position is that the steel slag tank (3) is positioned above the mixing bed (9) and is used for pouring a mixture of molten steel slag and materials in the steel slag tank (3) into the mixing bed (9) through a feed inlet (10), the feed inlet (10) is arranged above the front end of the mixing bed (9), a water spray nozzle (12) is arranged above the inner part of the mixing bed (9), a mixer (11) is arranged in the mixing bed (9) and is used for uniformly stirring the mixture of the molten steel slag and the materials in the mixing bed (9), and a discharge outlet (13) is arranged below the rear end of the mixing bed (9); the slag receiving tank (14) can move between a position below the discharge port (13) and a position placed in the hot stuffy tank (16) and is used for sending the modified steel slag cooled by the mixing bed (9) into the hot stuffy tank (16) for stuffy slag treatment.
The on-line tempering device for the slag tapping and cooling process of the molten steel slag further comprises a slag discharging car (15), wherein the slag receiving tank (14) can be seated on the slag discharging car (15) and is used for transporting the slag receiving tank (14) out of the mixing bed (9) through the slag discharging car (15). The steel slag pot (3) and the slag receiving pot (14) are steel-casting slag pots. The reducing agent bin (4), the calcium agent bin (5), the silicon agent bin (6) and the mixing bin (7) are steel structure bins. The feeder (8) is a screw feeder, the rotating speed of the screw is 10-100 r/min, and the grain diameter of the maximum conveyed material is 50 mm. The mixing bed (9) is of a closed box structure, a heat insulation layer is arranged outside the mixing bed (9), the thickness of the heat insulation material is not less than 5mm, and the diameters of the feeding port (10) and the discharging port (13) are not less than 1 m. The mixer (11) is of a single-tooth-roller structure, heat-resistant steel is adopted as external stirring teeth, and the rotating speed of the mixer (11) is 3-30 r/min.
The invention relates to a method for online tempering slag tapping and cooling processes of molten steel slag by preferably adopting the device, which comprises the following steps:
(1) molten steel slag is poured into a steel slag tank (3) through a slag outlet (2) by a steel-making furnace (1), and materials in a reducing agent bin (4), a calcium agent bin (5) and a silicon agent bin (6) are uniformly poured into the steel slag tank (3) along with the molten steel slag through a mixing bin (7) and a feeder (8) in the slag pouring process;
(2) preferably, a crown block is adopted, steel slag in the steel slag tank (3) is poured into a mixing bed (9) through a feeding hole (10), the mixture is stirred and mixed uniformly by a mixer (11), and a water spraying hole (12) is opened to pump water to the modified steel slag and cool the modified steel slag to a certain temperature after the stirring is finished for a certain modification time;
(3) the cooled modified steel slag is discharged into a slag receiving tank (14) through a discharge port (13), the slag receiving tank (14) is transported out of the mixing bed (9) through a tank discharging car (15), and then is preferably hoisted into a hot stuffy tank (16) through a crown block to carry out stuffy slag treatment.
Wherein the carbon element content of the reduction modifier in the reducing agent bin (4) exceeds 30 percent, and the addition amount of the reduction modifier for processing steel slag per ton is 30-150 kg; the content of calcium oxide element of the calcium increasing modifier in the calcium agent bin (5) exceeds 70 percent, and the addition amount of the calcium increasing modifier for processing steel slag per ton does not exceed 80 kg; the silicon oxide element content of the silicon-increasing modifier in the silicon agent bin (6) exceeds 70 percent, and the adding amount of the silicon-increasing modifier for processing steel slag per ton does not exceed 100 kg.
Wherein the stirring modification time of the steel slag by adopting the mixer (11) is 10-30 minutes. Preferably, the water spraying nozzle (12) sprays water to the modified steel slag for cooling for 5-15 minutes, the water spraying amount per ton of steel slag is 50-250kg, and the temperature of the treated modified steel slag is 500-800 ℃. Preferably, the slag receiving tank (14) filled with the modified steel slag is subjected to slag smoldering treatment in a hot smoldering tank (16), and the slag smoldering time is 1-5 hours. Preferably, the iron recovery rate of the modified steel slag exceeds 85%, the activity index of the steel slag exceeds 90%, and the technical scheme of the invention is as follows: the utility model provides an online quenching and tempering device of melting slag cooling process, it includes: the slag-tap-hole slag-removing device comprises a steel-smelting furnace, a slag hole, a steel slag pot, a reducing agent bin, a calcium agent bin, a silicon agent bin, a mixing bin, a feeder, a mixing bed, a feeding hole, a mixer, a water jet, a discharging hole, a slag receiving pot, a tank discharging car and a hot stuffy pot. The slag outlet is arranged above the side part of the steel furnace; the reducing agent bin, the calcium agent bin and the silicon agent bin are arranged above the mixing bin in parallel; a feeder is arranged below the mixing bin; the steel slag pot is arranged below the feeder and the slag outlet; the feed inlet is arranged above the front end of the mixing bed, the water spray nozzle is arranged above the inner part of the mixing bed, the mixer is arranged in the mixing bed, and the discharge outlet is arranged below the rear end of the mixing bed; the slag receiving tank is arranged below the discharge port, is seated on the tank discharging vehicle, and is finally placed in the hot stuffy tank.
An on-line quenching and tempering method for a slag tapping cooling process of molten steel slag carries out quenching and tempering modification on the steel slag under the condition of not providing an external heat source, and fully utilizes the residual heat resource of the molten steel slag. The method adopts special quenching and tempering modification devices such as a mixing bed and a mixer to carry out quenching and tempering modification treatment on the materials, radically changes the components of the steel slag, is simple and easy to operate, and obviously improves the performance of the steel slag.
Preferably, the online quenching and tempering method for the slag tapping cooling process of the molten steel slag comprises the following steps of: (1) the steel-making furnace pours the molten steel slag into the steel slag pot through the slag outlet, and the materials in the reducing agent bin, the calcium agent bin and the silicon agent bin are evenly poured into the steel slag pot together with the molten steel slag through the mixing bin and the feeder in the slag pouring process. (2) Pouring the steel slag in the steel slag tank into a mixing bed through a feeding hole by using a crane, uniformly mixing the steel slag by using a mixer, and after stirring for a certain modification time, opening a water spraying hole to pump water and cool the modified steel slag to a certain temperature. (3) And discharging the cooled modified steel slag into a slag receiving tank through a discharge port, conveying the slag receiving tank out of the mixing bed through a tank discharging vehicle, and then hoisting the slag into a hot stuffy tank through an overhead crane for stuffy slag treatment.
Wherein the content of carbon element in the reduction modifier in the reducing agent bin exceeds 30 percent, and the addition amount of the reduction modifier for processing steel slag per ton is 30-150 kg; the content of calcium oxide element of the calcium increasing modifier in the calcium agent bin exceeds 70 percent, and the addition amount of the calcium increasing modifier for processing steel slag per ton does not exceed 80 kg; the silicon oxide element content of the silicon-increasing modifier in the silicon agent bin exceeds 70 percent, and the adding amount of the silicon-increasing modifier for processing steel slag per ton does not exceed 100 kg. The three modifiers only require the content of main components, the cost of the modifiers is controlled at a low level, for example, the reducing modifier can be various materials, the proposed carbon content exceeds 30%, low-cost materials such as blast furnace ash, blue carbon and the like can be selected, and the content fluctuation of other components is large; also calcium-enhancing modifiers, silicon-enhancing modifiers are considered from this point of view.
The invention has the advantages that the device and the method realize the on-line modification treatment of the slag-out cooling process of the molten steel slag, the production equipment is simple, the flow of the treatment process is short, the efficiency is high, the reduction of iron oxide in the steel slag is promoted through the modification reaction, the metal iron recovery rate of the steel slag is fundamentally improved, the activity index of the steel slag is greatly improved, the resource utilization value of the steel slag is expected to be greatly improved, and the invention has obvious economic benefit.
Drawings
FIG. 1 is a schematic diagram of on-line quenching and tempering in the slag tapping and cooling process of molten steel slag.
Detailed Description
An online quenching and tempering device for a slag tapping cooling process of molten steel slag is shown in figure 1, and comprises: the slag-tap changer comprises a steel smelting furnace 1, a slag outlet 2, a steel slag tank 3, a reducing agent bin 4, a calcium agent bin 5, a silicon agent bin 6, a mixing bin 7, a feeder 8, a mixing bed 9, a feed inlet 10, a mixer 11, a water spray nozzle 12, a discharge port 13, a slag receiving tank 14, a tank discharging vehicle 15 and a hot stuffy tank 16. The slag outlet 2 is arranged above the side part of the steel making furnace 1; the reducing agent bin 4, the calcium agent bin 5 and the silicon agent bin 6 are arranged above the mixing bin 7 in parallel; a feeder 8 is arranged below the mixing bin 7; the steel slag pot 3 is arranged below the feeder 8 and the slag outlet 2; the feeding port 10 is arranged above the front end of the mixing bed 9, the water spraying port 12 is arranged above the inner part of the mixing bed 9, the mixer 11 is arranged in the mixing bed 9, and the discharging port 13 is arranged below the rear end of the mixing bed 9; the slag receiving tank 14 is arranged below the discharge port 14, is seated on the tank discharging vehicle 15, and finally the slag receiving tank 14 is placed in the hot stuffy tank 16. The steel slag tank 3 and the slag receiving tank 14 are cast steel structure slag tanks. The reducing agent bin 4, the calcium agent bin 5, the silicon agent bin 6 and the mixing bin 7 are steel structure bins. The feeder 8 is a screw feeder, the rotating speed of the screw is 10-100 r/min, and the particle size of the maximum conveyed material is 50 mm. The mixing bed 9 is of a closed box structure, a heat insulation layer is arranged outside the mixing bed, the thickness of the heat insulation material is not less than 5mm, and the diameters of the feeding hole 10 and the discharging hole 13 are not less than 1 m. The mixer 11 is of a single-tooth-roller structure, heat-resistant steel is adopted as external stirring teeth, and the rotating speed of the mixer 11 is 3-30 r/min.
An on-line quenching and tempering method in a slag tapping and cooling process of molten steel slag comprises the following steps: (1) the steel-making furnace 1 pours the molten steel slag into the steel slag tank 3 through the slag outlet 2, and the materials in the reducing agent bin 4, the calcium agent bin 5 and the silicon agent bin 6 are uniformly poured into the steel slag tank 3 together with the molten steel slag through the mixing bin 7 and the feeder 8 in the slag pouring process. (2) Pouring the steel slag in the steel slag tank 3 into a mixing bed 9 through a feeding hole 10 by using a crown block, uniformly mixing the steel slag by using a mixer 11, and after stirring for a certain modification time, opening a water spraying hole 12 to spray water to the modified steel slag and cooling the modified steel slag to a certain temperature. (3) The cooled modified steel slag is discharged into a slag receiving tank 14 through a discharge port 13, the slag receiving tank 14 is transported out of the mixing bed 9 through a tank discharging vehicle 15, and then is hoisted into a hot stuffy tank 16 through an overhead vehicle for stuffy slag treatment.
Wherein the carbon element content of the reduction modifier in the reducing agent bin 4 exceeds 30 percent, and the addition amount of the reduction modifier for processing steel slag per ton is 30-150 kg; the content of calcium oxide element of the calcium increasing modifier in the calcium agent bin 5 exceeds 70 percent, and the addition amount of the calcium increasing modifier for processing steel slag per ton does not exceed 80 kg; the silicon oxide element content of the silicon-increasing modifier in the silicon agent bin 6 exceeds 70 percent, and the adding amount of the silicon-increasing modifier for processing steel slag per ton does not exceed 100 kg. The stirring modification time of the steel slag by adopting the mixer 11 is 10-30 minutes. The water spraying opening 12 sprays water to the modified steel slag for cooling for 5-15 minutes, the water spraying amount per ton of the steel slag is 50-250kg, and the temperature of the treated modified steel slag is 500-800 ℃. The slag receiving tank 14 filled with the modified steel slag is subjected to slag smoldering treatment in a hot smoldering tank 16, and the slag smoldering time is 1-5 hours. The iron recovery rate of the modified steel slag exceeds 85 percent, and the activity index of the steel slag exceeds 90 percent.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. The utility model provides an online quenching and tempering device of melting steel slag cooling process, its characterized in that, the online quenching and tempering device of melting steel slag cooling process includes: the slag-tap changer comprises a steel smelting furnace (1), a slag outlet (2), a steel slag tank (3), a reducing agent bin (4), a calcium agent bin (5), a silicon agent bin (6), a mixing bin (7), a feeder (8), a mixing bed (9), a feeding port (10), a mixer (11), a water spray nozzle (12), a discharging port (13), a slag receiving tank (14) and a hot stuffy tank (16); the slag outlet (2) is arranged above the side part of the steel making furnace (1); the reducing agent bin (4), the calcium agent bin (5) and the silicon agent bin (6) are arranged above the mixing bin (7) in parallel, a feeder (8) is arranged below the mixing bin (7) and used for mixing materials in the reducing agent bin (4), the calcium agent bin (5) and the silicon agent bin (6) through the mixing bin (7) and then feeding the materials into the feeder (8), and the steel slag pot (3) can move between a first position and a second position, wherein the first position is a position where the steel slag pot (3) is located below the feeder (8) and the slag outlet (2) and used for enabling molten steel slag in the steel smelting furnace (1) to be poured into the steel slag pot (3) through the slag outlet (2) and simultaneously feeding the materials in the feeder (8) into the steel slag pot (3); the second position is that the steel slag tank (3) is positioned above the mixing bed (9) and is used for pouring a mixture of molten steel slag and materials in the steel slag tank (3) into the mixing bed (9) through a feed inlet (10), the feed inlet (10) is arranged above the front end of the mixing bed (9), a water spray nozzle (12) is arranged above the inner part of the mixing bed (9), a mixer (11) is arranged in the mixing bed (9) and is used for uniformly stirring the mixture of the molten steel slag and the materials in the mixing bed (9), and a discharge outlet (13) is arranged below the rear end of the mixing bed (9); the slag receiving tank (14) can move between a position below the discharge port (13) and a position placed in the hot stuffy tank (16) and is used for sending the modified steel slag cooled by the mixing bed (9) into the hot stuffy tank (16) for stuffy slag treatment.
2. The on-line refining device for the slag tapping cooling process of the molten steel slag as claimed in claim 1, wherein the on-line refining device for the slag tapping cooling process of the molten steel slag further comprises a slag tapping car (15), and the slag receiving tank (14) can be seated on the slag tapping car (15) and is used for transporting the slag receiving tank (14) out of the mixing bed (9) through the slag tapping car (15).
3. The on-line refining apparatus for slag tapping cooling process of molten steel slag according to any one of claims 1-2, wherein the slag pot (3) and the slag receiving pot (14) are steel-casting structure slag pots.
4. The on-line quenching and tempering device for the slag tapping cooling process of the molten steel slag according to any one of claims 1 to 2, wherein the reducing agent bin (4), the calcium agent bin (5), the silicon agent bin (6) and the mixing bin (7) are steel structure bins.
5. An on-line refining device for slag tapping and cooling process of molten steel slag as claimed in any one of claims 1-2, wherein the feeder (8) is a screw feeder, the screw speed is 10-100 rpm, and the maximum grain size of the transported material is 50 mm.
6. The on-line quenching and tempering device for the slag tapping cooling process of the molten steel slag according to any one of claims 1 to 2, wherein the mixing bed (9) is of a closed box structure, a heat insulation layer is arranged outside the mixing bed (9), the thickness of the heat insulation layer is not less than 5mm, and the diameters of the feeding port (10) and the discharging port (13) are not less than 1 m.
7. The on-line quenching and tempering device for the slag tapping cooling process of the molten steel slag according to any one of claims 1-2, characterized in that the mixer (11) is of a single-tooth roller structure, the external stirring teeth are made of heat-resistant steel, and the rotating speed of the mixer (11) is 3-30 rpm.
8. Method for on-line tempering of slag cooling of molten steel slag, preferably by means of an apparatus according to any of claims 1 to 7, characterized in that it comprises the following steps:
(1) molten steel slag is poured into a steel slag tank (3) through a slag outlet (2) by a steel-making furnace (1), and materials in a reducing agent bin (4), a calcium agent bin (5) and a silicon agent bin (6) are uniformly poured into the steel slag tank (3) along with the molten steel slag through a mixing bin (7) and a feeder (8) in the slag pouring process;
(2) preferably, a crown block is adopted, steel slag in the steel slag tank (3) is poured into a mixing bed (9) through a feeding hole (10), the mixture is stirred and mixed uniformly by a mixer (11), and a water spraying hole (12) is opened to pump water to the modified steel slag and cool the modified steel slag to a certain temperature after the stirring is finished for a certain modification time;
(3) the cooled modified steel slag is discharged into a slag receiving tank (14) through a discharge port (13), the slag receiving tank (14) is transported out of the mixing bed (9) through a tank discharging car (15), and then is preferably hoisted into a hot stuffy tank (16) through a crown block to carry out stuffy slag treatment.
9. The method of claim 8, wherein: the carbon element content of the reduction modifier in the reducing agent bin (4) exceeds 30 percent, and the addition amount of the reduction modifier for processing steel slag per ton is 30-150 kg; the content of calcium oxide element of the calcium increasing modifier in the calcium agent bin (5) exceeds 70 percent, and the addition amount of the calcium increasing modifier for processing steel slag per ton does not exceed 80 kg; the silicon oxide element content of the silicon-increasing modifier in the silicon agent bin (6) exceeds 70 percent, and the adding amount of the silicon-increasing modifier for processing steel slag per ton does not exceed 100 kg.
10. Method according to one of claims 8 to 9, characterized in that: the stirring modification time of the steel slag by adopting the mixer (11) is 10-30 minutes. Preferably, the water spraying nozzle (12) sprays water to the modified steel slag for cooling for 5-15 minutes, the water spraying amount per ton of steel slag is 50-250kg, and the temperature of the treated modified steel slag is 500-800 ℃. Preferably, the slag receiving tank (14) filled with the modified steel slag is subjected to slag smoldering treatment in a hot smoldering tank (16), and the slag smoldering time is 1-5 hours. Preferably, the iron recovery rate of the modified steel slag exceeds 85 percent, and the activity index of the steel slag exceeds 90 percent.
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| CN114107581A (en) * | 2021-11-17 | 2022-03-01 | 四川通达再生资源综合利用有限公司 | Steel slag recycling device and method |
| CN114292971A (en) * | 2022-01-07 | 2022-04-08 | 广西柳钢环保股份有限公司 | Novel steel slag treatment method |
| CN114672607A (en) * | 2022-03-18 | 2022-06-28 | 中国重型机械研究院股份公司 | Method for reducing iron oxide on line by converter deslagging |
| CN115121586A (en) * | 2022-07-04 | 2022-09-30 | 中冶节能环保有限责任公司 | Electric furnace slag treatment method and device |
| CN115491445A (en) * | 2022-09-01 | 2022-12-20 | 刘春茗 | Liquid steel slag dry-process quenching and tempering equipment and quenching and tempering method thereof |
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| CN115491445A (en) * | 2022-09-01 | 2022-12-20 | 刘春茗 | Liquid steel slag dry-process quenching and tempering equipment and quenching and tempering method thereof |
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