CN115029488A - Steel slag treatment system and method for treating steel slag by using same - Google Patents
Steel slag treatment system and method for treating steel slag by using same Download PDFInfo
- Publication number
- CN115029488A CN115029488A CN202210733948.2A CN202210733948A CN115029488A CN 115029488 A CN115029488 A CN 115029488A CN 202210733948 A CN202210733948 A CN 202210733948A CN 115029488 A CN115029488 A CN 115029488A
- Authority
- CN
- China
- Prior art keywords
- steel slag
- slag
- steel
- melting
- melting furnace
- 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.)
- Granted
Links
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
- C21B3/08—Cooling 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
-
- 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)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Furnace Details (AREA)
Abstract
The invention relates to a steel slag treatment system and a method for treating steel slag by adopting the same, which relate to the field of steel slag treatment and comprise a steel slag melting device and a control system; the steel slag melting device comprises a melting furnace, wherein a steel slag feeding port, a reactant feeding port, a gas stirring port, an iron outlet, a slag outlet and a plurality of heating electrodes positioned at different positions are arranged on the melting furnace; the control system is used for adjusting the adding amount of the reactant and/or the heating power of different heating electrodes according to the temperature and the weight of the steel slag to be added; the height of the tap hole and the slag hole is different, the position of the slag hole, which is positioned in the melting furnace, is higher than that of the tap hole, and the tap hole and the slag hole are used for shunting and discharging reduced iron and reconstructed steel slag. The steel slag melting device can continuously receive the steel slag, shorten the steel slag treatment process and improve the treatment efficiency.
Description
Technical Field
The invention relates to the field of steel slag treatment, in particular to a steel slag treatment system and a method for treating steel slag by adopting the same.
Background
The steel slag is a waste produced in the process of converter or electric furnace steel making, the yield is generally about 10-15% of the yield of crude steel, and the steel slag contains dicalcium silicate and tricalcium silicate which have similar components with cement, and also contains about 10% of metallic iron resources. The slag tapping temperature of the steel slag is above about 1400 ℃, and the steel slag is rich in huge heat.
At present, steel slag treatment technologies mainly comprise a hot splashing treatment process, a tank type hot stuffiness process, a pressure hot stuffiness process, a roller method treatment process, an air quenching treatment process, a granulation wheel treatment process, a disc splashing treatment process, a water quenching treatment process and the like, but the processes have some defects and drawbacks which cannot be overcome. Such as: (1) the hot splashing treatment process has long treatment period, large floor area, large environmental pollution, poor steel slag stability, no contribution to resource utilization and no recycling of heat. (2) The links of slag pouring, slag skimming and slag discharging in the tank type hot stuffiness process are open, dust cannot be collected, and the pollution is serious; the process operation requirement is strict; the equipment and automation degree is low, the number of workers is large, and the labor intensity is high; the heat is not recycled; there is a risk of explosion. (3) The process has the advantages of large investment, large occupied area, necessity of using a pressure container tank, no recycling of heat, explosion risk and high operating rate of a crane matched with a tank crane. (4) The treatment process of the roller method has large investment and high operating cost; the equipment is complex, the failure rate is high, and the maintenance difficulty is high; the steel slag treatment rate is low (about 50 percent); the heat is not recycled; there is a risk of explosion. (5) The air quenching treatment process can only treat liquid slag, and the utilization way of the product for treating the steel slag is narrow. (6) The treatment rate of the granulation wheel treatment process is low (generally about 50 percent); only steel slag with good fluidity can be processed; the equipment is seriously abraded; the gelling property of the processed steel slag is deteriorated, which affects the utilization of the steel slag. (7) The process slag tray treated by the tray splashing method is easy to deform; the process is complex; the investment and the operation cost are high; the steel slag has poor stability. (8) The treatment rate of the water quenching treatment process is low (50 percent at most); when water quenching is carried out, explosion easily occurs due to improper operation; the utilization way of the processed steel slag is narrow.
In addition, when the treated steel slag is magnetically separated, only the part which can be magnetized can be selected, and a large part of the iron oxide can not be magnetized and still remains in the tailings of the steel slag, thereby causing resource waste. The steel slag tailings after magnetic separation have the defects of low activity, high free calcium oxide content and the like compared with high furnace slag, so that the utilization rate is low, most of the steel slag tailings are accumulated to occupy land, and the environment is polluted.
Therefore, it is desirable to provide a method for melting and utilizing steel slag, which overcomes the disadvantages of the current steel slag treatment technology, reduces iron oxide in steel slag, improves the recovery rate and purity of iron, reconstructs steel slag tailings, improves the activity and stabilizes the quality of the steel slag, and recycles the heat contained in the steel slag to the maximum extent.
Disclosure of Invention
Technical problem
In view of the above, the technical problem to be solved by the present invention is how to provide a steel slag treatment system and a method for treating steel slag by using the same.
Solution scheme
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a steel slag treatment system, wherein the steel slag comprises liquid steel slag or liquid steel slag with partial solid steel slag, a steel slag melting device and a control system;
the steel slag melting device comprises a melting furnace, wherein a steel slag feeding port, a temperature sensor, a reactant feeding port, a gas stirring port, an iron outlet, a slag outlet and a plurality of heating electrodes positioned at different positions are arranged on the melting furnace;
the reactant charging hole is used for charging a reactant, and the reactant comprises a steel slag reducing agent and/or a reconstruction agent;
the control system is used for adjusting the adding amount of the reactant and/or the heating power of different heating electrodes according to the temperature and the weight of the steel slag to be added;
the steel slag feeding port is used for feeding steel slag into the melting furnace;
the gas stirring port is used for introducing gas to stir the molten steel slag;
the height of the tap hole and the height of the slag hole are different, the position of the slag hole, which is positioned in the melting furnace, is higher than the position of the tap hole, and the tap hole and the slag hole are used for shunting and discharging reduced iron and reconstructed steel slag.
The slag ladle tilting device comprises a slag ladle tilting system, a weighing system and a temperature measuring system, and is used for pouring the steel slag of the slag ladle into the melting furnace;
and the weighing system and the temperature measuring system are connected with the control system and are used for feeding back the weight and the temperature of the steel slag in the slag tank.
Further, the melting furnace is provided with a temperature sensor, and the temperature sensor is connected with the control system and used for monitoring the temperature in the melting furnace.
Further, the device also comprises a solid steel slag crushing device which is used for crushing the solid steel slag on the surface of the slag pot; optionally, the solid steel slag crushing device comprises a horizontal moving device, a telescopic device connected with the horizontal moving device, and a slag crushing part connected to the end of the telescopic device.
Further, the slag pot tipping system comprises a fixing mechanism for fixing the slag pot and a tipping mechanism for tipping the slag pot, wherein the rotating angle of the tipping mechanism is optionally 0-90 degrees, and the tipping mechanism is optionally controlled in a variable frequency mode and is used for enabling the steel slag tipping process to be stable.
Further, the system also comprises a steel slag rapid cooling and heat taking system and/or a steel slag slow cooling and heat taking system;
further, the steel slag rapid cooling and heat taking system comprises a flow guide device, a granulating device, a slow cooling device and an air-water heat exchange device; the flow guide device is used for guiding the reconstructed steel slag from the slag outlet of the melting furnace to the granulating device; the granulating device comprises a high-pressure spray gun and a particle bin, wherein the high-pressure spray gun is used for spraying high-speed jet flow to disperse the steel slag flowing out of the flow guide device and cool the steel slag in the particle bin to form particles; the slow cooling device is used for receiving the particles discharged by the particle bin and further cooling the particles; the air-water heat exchange device is used for exchanging heat with the granulating device and the slow cooling device.
Further, the second reconstructed slag treatment system comprises a pair roller device, a liquid-water heat exchange device and a crusher arranged below the pair roller device; and liquid metal for cooling the steel slag is arranged in the pair roller device, and the liquid metal exchanges heat with the liquid-water heat exchange device through a circulating pipeline.
And the system further comprises an online detection instrument for detecting whether the reconstructed steel slag is qualified or not, and the online detection instrument is used for discharging the steel slag into a steel slag rapid cooling and heat taking system and/or a steel slag slow cooling and heat taking system after the reconstructed steel slag is qualified.
Further, the device also comprises a feeding device used for feeding the reactant into the reactant feeding port, the feeding device is matched with a metering device, and the feeding device and the metering device are connected with a control system.
Furthermore, the steel slag melting device also comprises a slag chute for guiding the steel slag into the steel slag feeding port.
Furthermore, the melting furnace is also provided with a dust removal port, and the dust removal port is used for being connected with a matched dust removal system and removing dust-containing gas generated in the melting device.
Further, the steel slag is selected from one or more of common steel slag, vanadium-titanium steel slag, casting residue and desulphurization slag.
In another aspect, the present invention provides a method for processing steel slag by using the steel slag processing system, comprising the following steps:
weighing and measuring the temperature of the steel slag, and adding the steel slag into a melting furnace;
the control system adjusts the heating power of the electrode according to the feedback steel slag temperature and weight to enable the steel slag to be in a molten state;
adding a reactant into a melting device for reaction, and introducing inert gas for stirring to ensure that the steel slag and the reactant are fully reacted; optionally, the reactant comprises a reducing agent and/or a reconstituting agent;
the reduced molten iron flows out at regular time through the tapping hole and is used for returning to the steelmaking process, and the reconstructed steel slag flows out through the slag outlet.
Further, the method also comprises the following steps: carrying out online detection on the reconstructed steel slag flowing out of the slag outlet, and after the detection is qualified, carrying out at least the following treatment on the reconstructed steel slag:
1) guiding the reconstructed steel slag to flow out, spraying high-speed jet flow sprayed by a high-pressure spray gun to disperse and granulate the steel slag, so that the steel slag is cooled to form particles below 5mm in the dispersing process, then discharging the granulated particles into a slow cooling device to carry out heat exchange cooling, and optionally carrying out heat exchange in the granulating process; optionally, the water consumption of the high-pressure spray gun is 100kg of water/150 t of slag;
2) pouring the reconstructed steel slag into a double-roller device, cooling the steel slag through liquid metal in the double-roller device, crushing the cooled steel slag in a crusher to obtain a material, and optionally, exchanging heat between the liquid metal and a liquid-water heat exchange device through a circulating pipeline.
Further, in the process of melting the steel slag, dust-containing gas generated in the melting device is removed through a dust removal system.
Further, adding the steel slag into the melting furnace, and pouring the steel slag in the slag tank into the melting furnace through a tilting mechanism, wherein the rotation angle of the tilting mechanism is 0-90 degrees, optionally, the tilting mechanism adopts variable frequency control, the rotation speed during tilting can be adjusted, and the tilting speed is slower when the tilting angle is larger.
Advantageous effects
(1) The invention adopts the steel slag melting treatment device to realize the slag-iron separation of the steel slag in the treatment stage, omits the subsequent steel slag magnetic separation procedure, and reconstructs the residual steel slag tailings components to realize the waste recycling of the steel slag. The heat of the steel slag is recycled, and water resources are saved; the steel slag melting device can continuously receive the steel slag, shorten the steel slag treatment process and improve the treatment efficiency.
(2) The steel slag melting device can continuously receive slag without waiting for the completion of one steel slag pot and then receiving the next steel slag pot, and intelligently controls the plurality of electrodes to heat the steel slag through the control system, so that the original steel slag and the newly poured steel slag in the steel slag melting device can be ensured to be adjusted to different heating powers by the electrodes at different positions to heat or preserve heat of the steel slag. And the reduced molten iron and the reconstructed steel slag can be discharged at regular time without waiting for the slag to be fed after being completely discharged. The whole steel slag melting treatment process can be operated uninterruptedly, can adapt to the slag tapping period of various steel-making workshops, only needs one set of matched auxiliary equipment, occupies small area and saves investment. The problem of among the prior art slag melting treatment device need accept earlier a jar of slag and then go on the processing of the steel slag of going off the jar is solved, also solved because of the too short problem that leads to the steel slag to wait for the steel slag cooling, waste heat in the workshop slag-tap cycle, can effectively accelerate the turnover of slag ladle, reduce and need set up the problem that a plurality of slag melting treatment devices arouse the cost rising.
(2) By adopting the technical scheme and the method for directly treating the high-temperature liquid steel slag, the electrode heating power consumption of the steel slag melting treatment device is saved, the liquid steel slag tailings are not cooled in a water pumping mode, the steel slag heat is recycled, water resources are saved, the steel slag treatment is green, no discharge is generated, the generated dust-containing gas is organized and discharged after passing through a dust removal system, the environment is protected, and the method meets the national environmental protection policy. The iron in the steel slag is reduced in the treatment process, a steel slag magnetic separation processing line is not required to be built, and the occupied area of a factory is reduced. After the steel slag tailings are reconstructed, the activity is improved, the quality is stable, the tailings can be completely utilized, waste materials are changed into valuable materials, and the steel slag tailings are not piled up to occupy land and pollute the environment. The whole process is completed by mechanical equipment from the moment that the steel slag is placed on the slag ladle tipping device to the moment that steel slag products are generated, and the automation level is higher than that of other steel slag treatment processes, so that the labor intensity of workers is reduced, and the labor is saved.
(4) After the steel slag is treated by the reconstruction agent, the fluidity of the steel slag is improved, and the viscosity of the steel slag is reduced, so that a steel slag quenching treatment mode (high-pressure spray gun spraying high-speed jet flow) can be realized, and a mode that the steel slag is poor in fluidity and large in viscosity and is not suitable for quenching is solved.
(5) The heat exchange device can improve the reutilization of heat energy, and simultaneously adopts liquid metal as a heat exchange medium, so that the heat exchange device can be configured according to different heat exchange speed requirements and can be customized for different products.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood and to make the technical means implementable in accordance with the content of the description, and to make the above and other objects, technical features, and advantages of the present invention more comprehensible, one or more preferred embodiments are listed below, and are described in detail below with reference to the accompanying drawings.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a schematic plan view of a process flow of one embodiment of a steel slag treatment system of the present invention.
FIG. 2 is a schematic side sectional view of a process flow of one embodiment of a steel slag treatment system of the present invention.
FIG. 3 is a schematic front cross-sectional view of a process flow of one embodiment of the steel slag treatment system of the present invention.
Fig. 4 is a schematic flow diagram of a quenching process of the steel slag processing system according to an embodiment of the present invention.
Fig. 5 is a schematic view of a slow cooling process of the reconstituted steel slag according to an embodiment of the steel slag treatment system of the present invention.
Description of the main reference numerals:
the slag ladle furnace comprises a 1-slag ladle tipping system, a 1-1 fixing mechanism, a 1-2 tipping mechanism, a 2-solid steel slag crushing device, a 2-1 horizontal moving device, a 2-2 telescopic device, a 2-3 slag breaking part, a 3-steel slag melting device, a 3-1 reactant feeding port, a 3-2 electrode, a 3-3 dust removing port, a 3-4 slag discharging port, a 3-5 iron discharging port, a 3-6 steel slag feeding port, a 4-feeding device, a 7-flow guiding device, an 8-high-pressure spray gun, a 9-particle bin, a 10-slow cooling device, an 11-air water heat exchange device, a 12-pair roller cooling device, a 13-crusher and a 14-liquid water heat exchange device.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Spatially relative terms, such as "below," "lower," "upper," "above," "upper," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the object in use or operation in addition to the orientation depicted in the figures. For example, if the items in the figures are turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the elements or features. Thus, the exemplary term "below" can encompass both an orientation of below and above. The article may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative terms used herein should be interpreted accordingly.
In this document, the terms "first", "second", etc. are used to distinguish two different elements or portions, and are not used to define a particular position or relative relationship. In other words, the terms "first," "second," and the like may also be interchanged with one another in some embodiments.
As shown in fig. 1 to 5, the present invention provides a steel slag treatment system, wherein the steel slag comprises liquid steel slag or liquid steel slag with partial solid steel slag, and comprises a steel slag melting device 3 and a control system; the steel slag melting device 3 comprises a melting furnace, wherein a steel slag inlet 3-6, a temperature sensor (which can be shot on a furnace cover), a reactant inlet 3-1, a gas stirring port, an iron outlet 3-5, a slag outlet 3-4 and a plurality of heating electrodes 3-2 positioned at different positions are arranged on the melting furnace; the reactant charging hole 3-1 is used for charging a reactant, and the reactant comprises a steel slag reducing agent and/or a reconstruction agent; the control system is used for adjusting the adding amount of the reactant and/or the heating power of different heating electrodes according to the temperature and the weight of the steel slag to be added; the steel slag adding port 3-6 is used for adding steel slag into the melting furnace; the gas stirring port is used for introducing gas to stir and melt the steel slag; the heights of the tap hole 3-5 and the slag hole 3-4 are different, the position of the slag hole 3-4 in the melting furnace is higher than the position of the tap hole 3-5, and the tap hole 3-5 and the slag hole 3-4 are used for shunting and discharging reduced iron and reconstructed steel slag.
When the device is used, the temperature and the weight of the steel slag are measured before the steel slag is added and fed back to the control system, after the steel slag is poured into the steel slag melting device, the control system intelligently adjusts each heating electrode according to the temperature and weight feedback, a reactant is added through a reactant feeding port, the reaction is fully carried out through gas stirring, and reduced iron and reconstructed steel slag are shunted and discharged by utilizing the difference of specific gravity of iron and slag and setting different heights of an iron outlet and a slag outlet. And when the steel slag is not treated, the steel slag can be continuously added, and the control system intelligently adjusts the heating electrode according to the adding condition to realize continuous reaction and continuous discharge.
Further, the slag ladle tilting device comprises a slag ladle tilting device 1, wherein the slag ladle tilting device 1 comprises a slag ladle tilting system, a weighing system and a temperature measuring system, and the slag ladle tilting device 1 is used for pouring steel slag in a slag ladle into a melting furnace; the weighing system and the temperature measuring system are connected with the control system and used for feeding back the weight and the temperature of the steel slag in the slag tank.
Further, the melting furnace is provided with a temperature sensor, and the temperature sensor is connected with the control system and used for monitoring the temperature in the melting furnace
When the slag melting device is used specifically, a slag tank filled with liquid steel slag is placed on the fixing mechanism by the overhead travelling crane, the weighing system is used for weighing the weight of the steel slag in the slag tank, the temperature measuring device is used for measuring the temperature of the steel slag in the slag tank and feeding back the weight and the temperature of the steel slag to the control system, and the control system is used for adjusting the working parameters of the steel slag melting device 3 in the next procedure in a linkage mode, so that the medicament and the heating of the steel slag melting device are based, and the intelligent control function is realized. The steel slag which is weighed and measured in temperature is poured into a slag chute of the steel slag melting device 3 by the tipping mechanism and enters the steel slag melting device 3 through the slag chute.
Further, the device also comprises a solid steel slag crushing device 2 which is used for crushing the solid steel slag on the surface of the slag pot; optionally, the solid steel slag crushing device 2 comprises a horizontal moving device 2-1, a telescopic device 2-2 connected with the horizontal moving device, and a slag crushing part 2-3 connected with the end part of the telescopic device 2-2. If the slag surface in the slag ladle of the slag ladle tipping device 1 is cooled into solid slag, which can affect the tipping of the liquid slag, the solid slag crushing device 2 crushes the solid slag on the surface layer, and the crushed solid slag and the liquid slag are poured into the slag melting device 3 together.
Further, the slag pot tilting system comprises a fixing mechanism 1-1 for fixing the slag pot and a tilting mechanism 1-2 for tilting the slag pot, wherein the tilting mechanism 1-2 is optionally rotated by 0-90 degrees, so that the slag pot can be safely and stably rotated by taking the axis of the suspension trunnion as a rotation center. Optionally, the tipping mechanism 1-2 is controlled by frequency conversion and is used for enabling the steel slag to be tipped stably. In order to ensure the stable dumping process of the liquid steel slag, the dumping mechanism adopts variable frequency control, the rotating speed during dumping can be adjusted, and the larger the dumping angle is, the slower the dumping speed is.
Furthermore, the system also comprises a steel slag rapid cooling and heat taking system and/or a steel slag slow cooling and heat taking system.
Further, the steel slag quenching and heat taking system comprises a flow guide device 7, a granulating device, a slow cooling device 10 and a gas-water heat exchange device 11; the flow guide device 7 is used for guiding the reconstructed steel slag from the slag outlet 3-4 of the melting furnace to the granulating device; the granulating device comprises a high-pressure spray gun 8 and a particle bin 9, wherein the high-pressure spray gun 8 is used for spraying high-speed jet flow to disperse the steel slag flowing out of the flow guide device and reduce the temperature in the particle bin 9 to form particles; the slow cooling device 10 is used for receiving the particles discharged from the particle bin 9 and further cooling the particles; the gas-water heat exchange device 11 is used for exchanging heat with the granulating device and the slow cooling device 10. The high pressure lance is preferably a supercritical high pressure lance.
In the steel slag rapid cooling and heat taking system, a granulating device and a slow cooling device 10 are used for two-stage cooling, so that the heat recovery after steel slag granulation is more thorough. High-pressure water is used by a supercritical high-pressure spray gun, high-speed jet flow is formed by the spray gun, liquid steel slag is dispersed, the steel slag is solidified during falling in a particle bin, and the content of vitreous bodies in the granulated steel slag is obviously increased. The water consumption is about 100-150 kg/t slag. The temperature of the steel slag in the granulating device is reduced to about 800 ℃, and the heat in the particle bin 9 is converted into high-temperature saturated or superheated steam (230-; the steel slag is discharged from the granulating device and enters the slow cooling device 10, the temperature of the steel slag in the slow cooling device 10 is reduced to be below 100 ℃, meanwhile, the granulating device also has a heat exchange function, and the heat in the slow cooling device 10 is converted into high-temperature saturated or superheated steam (230-. The discharged materials are suitable for being used as cement clinker, slag powder raw materials and the like.
The invention reduces the viscosity of the steel slag by adding the restructuring agent and improves the fluidity, thereby effectively utilizing high speed to realize quenching and granulating.
Further, the second reconstructed slag treatment system comprises a pair roller device 12, a liquid-water heat exchange device 14 and a crusher 13 arranged below the pair roller device 14; the pair roller device 12 is internally provided with liquid metal for cooling steel slag, and the liquid metal exchanges heat with the liquid-water heat exchange device 14 through a circulating pipeline.
Liquid metal is filled in the roller pair device 12, the steel slag is cooled through the liquid metal, the cooled steel slag falls into the crusher 13 below, and materials with proper grain size are produced through crushing by the crusher. The discharged steel slag is suitable for being used as concrete aggregate, building sandstone and the like. Meanwhile, the liquid metal for cooling the steel slag transmits heat to the liquid-water heat exchange device 14, the liquid metal exchanges heat with water to generate high-temperature saturated or superheated steam (230-.
The steel slag can be cooled by adopting two modes of quenching granulation and slow cooling after being quenched and tempered in a steel slag melting device:
the liquid steel slag is quenched by a supercritical high-pressure spray gun for quenching granulation, the temperature of the steel slag is about 800 ℃, the proper cooling speed is adjusted in a granulation device to improve the tricalcium silicate content of the steel slag, the steel slag is suitable for being used as cement clinker, slag powder raw materials and the like, a slow cooling device is adopted in the second stage to further recover heat, meanwhile, the temperature of the steel slag is reduced to be below 100 ℃, the heat of the steel slag is recovered through two-stage heat exchange, steam is generated, and the heat recovery rate reaches over 75%.
The discharged steel slag is slowly cooled by the aid of the pair rollers filled with liquid metal, the liquid steel slag exchanges heat with the liquid metal in the pair rollers through extrusion of the pair rollers, the proper cooling speed is adjusted to enable components of the steel slag to be suitable for being used as concrete aggregate, building sandstone and the like, and the steel slag enters the crusher to be crushed after passing through the pair rollers, so that concrete aggregate and building sandstone with proper grain size are produced. The roller cools the steel slag and recovers the heat of the steel slag, the liquid metal exchanges heat with water to generate steam, and the energy recovery rate can reach over 60 percent.
The steel slag heat recovered by the quenching granulation mode and the slow cooling mode can generate steam for steel mills to use or for power generation.
And the system further comprises an online detection instrument for detecting whether the reconstructed steel slag is qualified or not, and the online detection instrument is used for discharging the steel slag into a steel slag rapid cooling and heat taking system and/or a steel slag slow cooling and heat taking system after the reconstructed steel slag is qualified.
Furthermore, the device also comprises a feeding device used for feeding the reactant into the reactant feeding port, the feeding device is matched with a metering device, and the feeding device and the metering device are connected with a control system.
Furthermore, the steel slag melting device also comprises a slag chute for guiding the steel slag into the steel slag feeding port.
Furthermore, the melting furnace is also provided with a dust removal port, and the dust removal port is used for being connected with a matched dust removal system and removing dust-containing gas generated in the melting device.
Further, the steel slag can be one or more selected from common steel slag, vanadium-titanium steel slag, casting residue and desulphurization slag.
In another aspect, the present invention provides a method for processing steel slag by using the steel slag processing system, comprising the following steps:
weighing and measuring the temperature of the steel slag, and adding the steel slag into a melting furnace;
the control system adjusts the heating power of the electrode according to the feedback steel slag temperature and weight to enable the steel slag to be in a molten state;
adding a reactant into a melting device for reaction, and introducing inert gas for stirring to ensure that the steel slag and the reactant are fully reacted; optionally, the reactant comprises a reducing agent and/or a reconstituting agent;
the reduced molten iron flows out at regular time through a tap hole 3-5 for returning to the steelmaking process, and the reconstructed steel slag flows out through a slag hole 3-4.
Further, the method also comprises the following steps: carrying out on-line detection on the reconstructed steel slag flowing out of the slag hole 3-4, and after the detection is qualified, carrying out at least the following treatment on the reconstructed steel slag:
1) guiding the reconstructed steel slag to flow out, spraying high-speed jet flow to disperse and granulate the steel slag through a high-pressure spray gun, cooling the steel slag to form particles with the particle size of less than 5mm in the dispersion process, then discharging the granulated particles into a slow cooling device to carry out heat exchange cooling, and optionally carrying out heat exchange in the granulation process; optionally, the water consumption of the high-pressure spray gun is 100kg of water/150 t of slag;
2) pouring the reconstructed steel slag into a double-roller device, cooling the steel slag through liquid metal in the double-roller device, crushing the cooled steel slag in a crusher to obtain a material, and optionally, exchanging heat between the liquid metal and a liquid-water heat exchange device through a circulating pipeline.
Further, in the process of melting the steel slag, dust-containing gas generated in the melting device is removed through a dust removal system.
Further, adding the steel slag into the melting furnace, and pouring the steel slag in the slag tank into the melting furnace through a tilting mechanism, wherein the rotation angle of the tilting mechanism is 0-90 degrees, optionally, the tilting mechanism adopts variable frequency control, the rotation speed during tilting can be adjusted, and the tilting speed is slower when the tilting angle is larger. The steel slag treatment method of the invention comprises the following specific steps:
step 1, a crown block places a slag ladle filled with steel slag on a slag ladle tipping device 1, and the slag ladle tipping device 1 is used for weighing and measuring the temperature of the high-temperature liquid steel slag;
step 2, if a solid slag layer appears on the surface of the steel slag in the slag pot, crushing the steel slag by the solid steel slag crushing device 2, and after the crushing process is finished, dumping the steel slag in the slag pot into a slag chute of the steel slag melting device 3 by the slag pot tipping device 1;
step 3, the steel slag melting device 3 adjusts the power of the heating electrode according to the steel slag temperature fed back by the slag pot tipping device 1, and heats the steel slag to keep the steel slag in a high-temperature melting state;
step 4, adding a reducing agent and a reconstruction agent into the steel slag melting device 3 according to a certain proportion by the steel slag reducing agent and reconstruction agent feeding device 4 according to the steel slag weight fed back by the slag ladle tipping device 1;
step 5, introducing gases such as nitrogen into a gas stirring port of the steel slag melting treatment device 3, so that the molten steel slag and the medicament added by the feeding device 4 are fully reacted;
step 6, when the steel slag melting device 3 works, the generated dust-containing gas enters a dust removal system from a dust removal port to be purified and then is discharged outside;
and 7, the reduced molten iron flows into the molten iron tank through the reduced iron taphole 3-5 and then returns to the main steelmaking process. The steel slag on the upper layer of the molten iron flows into a slag tank through a reconstructed slag outlet 3-4, so that the separation of slag and iron is realized;
Step 9 (parallel to step 8), pouring the steel slag discharged from the reconstructed slag outlet 3-4 into a pair roller device 12 after the steel slag is detected to be qualified by an online detection instrument, introducing liquid metal into the pair roller device 12, cooling the steel slag by the liquid metal, enabling the cooled steel slag to fall into a crusher 13 below, and crushing the steel slag by the crusher to produce a material with a proper grain size. The discharged steel slag is suitable for being used as concrete aggregate, building sandstone and the like. Meanwhile, the liquid metal for cooling the steel slag transmits heat to the liquid-water heat exchange device 14, the liquid metal exchanges heat with water to generate high-temperature saturated or superheated steam (230-.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications. Any simple modifications, equivalent changes and modifications made to the above exemplary embodiments shall fall within the scope of the present invention.
Claims (10)
1. A steel slag treatment system, the steel slag comprises liquid steel slag or liquid steel slag with partial solid steel slag, which is characterized by comprising a steel slag melting device and a control system;
the steel slag melting device comprises a melting furnace, wherein a steel slag feeding port, a reactant feeding port, a gas stirring port, an iron outlet, a slag outlet and a plurality of heating electrodes positioned at different positions are arranged on the melting furnace;
the reactant charging hole is used for charging a reactant, and the reactant comprises a steel slag reducing agent and/or a reconstruction agent;
the control system is used for adjusting the adding amount of the reactant and/or the heating power of different heating electrodes according to the temperature and the weight of the steel slag to be added;
the steel slag feeding port is used for feeding steel slag into the melting furnace;
the gas stirring port is used for introducing gas to stir molten steel slag;
the height of the tap hole and the slag hole is different, the position of the slag hole, which is positioned in the melting furnace, is higher than that of the tap hole, and the tap hole and the slag hole are used for shunting and discharging reduced iron and reconstructed steel slag.
2. The steel slag processing system of claim 1, further comprising a slag pot tilting device, wherein the slag pot tilting device comprises a slag pot tilting system, a weighing system and a temperature measuring system, and is used for pouring the steel slag of the slag pot into the melting furnace;
the weighing system and the temperature measuring system are connected with the control system and are used for feeding back the weight and the temperature of the steel slag in the slag tank;
and/or the melting furnace is provided with a temperature sensor, and the temperature sensor is connected with the control system and used for monitoring the temperature in the melting furnace.
3. The steel slag treatment system according to claim 2, further comprising a solid steel slag crushing device for crushing the solid steel slag on the surface of the slag pot; optionally, the solid steel slag crushing device comprises a horizontal moving device, a telescopic device connected with the horizontal moving device, and a slag crushing part connected to the end part of the telescopic device;
and/or the slag pot tipping system comprises a fixing mechanism for fixing the slag pot and a tipping mechanism for tipping the slag pot, wherein the rotating angle of the tipping mechanism is optionally 0-90 degrees, and the tipping mechanism is optionally controlled in a variable frequency mode and is used for enabling the steel slag tipping process to be smooth.
4. The steel slag treatment system according to any one of claims 1 to 3, further comprising a steel slag rapid cooling and heat extracting system and/or a steel slag slow cooling and heat extracting system;
optionally, the steel slag rapid cooling and heat extracting system comprises a flow guide device, a granulating device, a slow cooling device and an air-water heat exchange device; the flow guide device is used for guiding the reconstructed steel slag from the slag outlet of the melting furnace to the granulating device; the granulating device comprises a high-pressure spray gun and a particle bin, wherein the high-pressure spray gun is used for spraying high-speed jet flow to disperse the steel slag flowing out of the flow guide device and cool the steel slag in the particle bin to form particles; the slow cooling device is used for receiving the particles discharged by the particle bin and further cooling the particles; the gas-water heat exchange device is used for exchanging heat with the granulating device and the slow cooling device;
optionally, the second reconstructed slag treatment system comprises a pair roller device, a liquid-water heat exchange device and a crusher arranged below the pair roller device; liquid metal for cooling steel slag is arranged in the pair roller device, and the liquid metal exchanges heat with the liquid-water heat exchange device through a circulating pipeline;
optionally, the system further comprises an online detection instrument for detecting whether the reconstructed steel slag is qualified, and the online detection instrument is used for discharging the steel slag into the steel slag rapid cooling and heat extracting system and/or the steel slag slow cooling and heat extracting system after the reconstructed steel slag is qualified.
5. The steel slag treatment system according to any one of claims 1 to 4, further comprising a feeding device for feeding the reactant into the reactant feeding port, wherein the feeding device is provided with a metering device, and the feeding device and the metering device are connected with the control system;
and/or the steel slag melting device also comprises a slag chute used for guiding the steel slag to enter the steel slag feeding port.
6. The steel slag treatment system according to any one of claims 1 to 5, wherein the melting furnace is further provided with a dust removal port, and the dust removal port is used for connecting with a matched dust removal system and removing dust-containing gas generated in the melting device;
and/or the steel slag is selected from one or more of common steel slag, vanadium-titanium steel slag, casting residue and desulphurization slag.
7. A method of processing steel slag using the steel slag processing system according to any one of claims 1 to 6, comprising the steps of:
weighing and measuring the temperature of the steel slag, and adding the steel slag into a melting furnace;
the control system adjusts the heating power of the electrode according to the feedback steel slag temperature and weight to enable the steel slag to be in a molten state;
adding a reactant into a melting device for reaction, and introducing inert gas for stirring to ensure that the steel slag and the reactant are fully reacted; optionally, the reactant comprises a reducing agent and/or a reconstituting agent;
the reduced molten iron flows out at regular time through the tapping hole and is used for returning to the steelmaking process, and the reconstructed steel slag flows out through the slag outlet.
8. The method of claim 7, further comprising the steps of: carrying out on-line detection on the reconstructed steel slag flowing out of the slag outlet, and after the detection is qualified, carrying out at least the following treatment on the reconstructed steel slag:
1) guiding the reconstructed steel slag to flow out, spraying high-speed jet flow sprayed by a high-pressure spray gun to disperse and granulate the steel slag, so that the steel slag is cooled to form particles below 5mm in the dispersing process, then discharging the granulated particles into a slow cooling device to carry out heat exchange cooling, and optionally carrying out heat exchange in the granulating process; optionally, the water consumption of the high-pressure spray gun is 100kg of water/150 t of slag;
2) pouring the reconstructed steel slag into a double-roller device, cooling the steel slag through liquid metal in the double-roller device, crushing the cooled steel slag in a crusher to obtain a material, and optionally, exchanging heat between the liquid metal and a liquid-water heat exchange device through a circulating pipeline.
9. The method according to claim 7 or 8, wherein the dust-containing gas generated in the melting device is also removed by a dust removal system during the melting of the steel slag.
10. The method of claim 7 or 8, wherein the steel slag is added into the melting furnace, and the steel slag in the slag tank is poured into the melting furnace through a tilting mechanism, wherein the tilting mechanism has a rotation angle of 0-90 degrees, optionally, the tilting mechanism adopts variable frequency control, and the rotation speed during the tilting can be adjusted, wherein the larger the tilting angle, the slower the tilting speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210733948.2A CN115029488B (en) | 2022-06-27 | 2022-06-27 | Steel slag treatment system and method for treating steel slag by adopting same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210733948.2A CN115029488B (en) | 2022-06-27 | 2022-06-27 | Steel slag treatment system and method for treating steel slag by adopting same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115029488A true CN115029488A (en) | 2022-09-09 |
| CN115029488B CN115029488B (en) | 2023-10-03 |
Family
ID=83127717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210733948.2A Active CN115029488B (en) | 2022-06-27 | 2022-06-27 | Steel slag treatment system and method for treating steel slag by adopting same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115029488B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116732258A (en) * | 2023-06-28 | 2023-09-12 | 无锡市东方环境工程设计研究所有限公司 | Process slag flow control device and method for realizing multi-furnace continuous air quenching and granulation of steel slag |
| WO2024254702A1 (en) * | 2023-06-14 | 2024-12-19 | Hatch Ltd. | Waste ferrous slag cleaning method, furnace, and system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103557711A (en) * | 2013-11-05 | 2014-02-05 | 南京凯盛开能环保能源有限公司 | Molten slag rapid cooling, granulation and waste heat recovery power generation system and method |
| EP2759606A1 (en) * | 2012-06-27 | 2014-07-30 | Nippon Steel & Sumitomo Metal Corporation | Steel slag reduction equipment and steel slag reduction system |
| CN106048109A (en) * | 2016-07-18 | 2016-10-26 | 东北大学 | Method for mixed slag smelting reduction recycling and thermal refining |
| CN112723761A (en) * | 2021-01-28 | 2021-04-30 | 天津水泥工业设计研究院有限公司 | Full-solid waste modifier for reduction and reconstruction of molten steel slag, modification process and product |
| CN112899418A (en) * | 2021-03-19 | 2021-06-04 | 中冶节能环保有限责任公司 | Vertical cooling heat exchange power generation device and method for molten steel slag |
| CN216005917U (en) * | 2021-09-27 | 2022-03-11 | 郭瑛 | Molten steel slag reduction ironmaking equipment |
-
2022
- 2022-06-27 CN CN202210733948.2A patent/CN115029488B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2759606A1 (en) * | 2012-06-27 | 2014-07-30 | Nippon Steel & Sumitomo Metal Corporation | Steel slag reduction equipment and steel slag reduction system |
| CN103557711A (en) * | 2013-11-05 | 2014-02-05 | 南京凯盛开能环保能源有限公司 | Molten slag rapid cooling, granulation and waste heat recovery power generation system and method |
| CN106048109A (en) * | 2016-07-18 | 2016-10-26 | 东北大学 | Method for mixed slag smelting reduction recycling and thermal refining |
| CN112723761A (en) * | 2021-01-28 | 2021-04-30 | 天津水泥工业设计研究院有限公司 | Full-solid waste modifier for reduction and reconstruction of molten steel slag, modification process and product |
| CN112899418A (en) * | 2021-03-19 | 2021-06-04 | 中冶节能环保有限责任公司 | Vertical cooling heat exchange power generation device and method for molten steel slag |
| CN216005917U (en) * | 2021-09-27 | 2022-03-11 | 郭瑛 | Molten steel slag reduction ironmaking equipment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024254702A1 (en) * | 2023-06-14 | 2024-12-19 | Hatch Ltd. | Waste ferrous slag cleaning method, furnace, and system |
| CN116732258A (en) * | 2023-06-28 | 2023-09-12 | 无锡市东方环境工程设计研究所有限公司 | Process slag flow control device and method for realizing multi-furnace continuous air quenching and granulation of steel slag |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115029488B (en) | 2023-10-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109112238B (en) | Spiral crushing device and method for molten steel slag | |
| CN115029488B (en) | Steel slag treatment system and method for treating steel slag by adopting same | |
| CN105621906B (en) | A kind of metallurgical slag granulation processing system and method | |
| CN111471817A (en) | Gas quenching method for improving stability of steel slag and recovering physical heat of molten steel slag | |
| US6241798B1 (en) | Iron smelting process and plant according to the multiple zone smelting process | |
| CN101880737A (en) | System and method for recovering waste heat of continuous hot steel slag | |
| JPS5927732B2 (en) | Heat recovery method from molten slag | |
| CN103896275A (en) | Plasma refining and purifying furnace for producing solar energy polysilicon through metallurgy method | |
| CN104561405A (en) | Hot steel-making slag high-temperature solidification, pelletization and heat recovery method and equipment system thereof | |
| CN116926247A (en) | Steel slag modification and valuable element recovery method | |
| KR20120075329A (en) | Integrated iron and steelmaking system and method | |
| JP5107226B2 (en) | Method and apparatus for recovering refractory debris and ladle slag as process slag in ferrous metallurgy production at EAF and for performing related metering on a furnace for forming process slag | |
| CN106755660A (en) | A kind of foamed slag dilute phase dry granulation methods based on steel mill's solid waste melting and reducing | |
| CN114262761B (en) | Short-flow integrated treatment system and treatment method for steel slag | |
| CN104404190A (en) | A hot metal desiliconization agent, a spraying device and a method for pretreatment of hot metal desiliconization | |
| CN105154604B (en) | Improve the method and device of Iron-smelting efficiency | |
| CN110643757B (en) | Processing method of thermal state casting slag processing system | |
| Li et al. | Recent progress of hot stage processing for steelmaking slags in China considering stability and heat recovery | |
| CN209113933U (en) | A kind of molten steel slag spiral crushing device | |
| JP4946931B2 (en) | Apparatus and method for cooling molten slag | |
| CN216947078U (en) | Short-flow thermal state steel slag treatment system | |
| CN218710606U (en) | Continuous steel slag reduction modification equipment | |
| CN104593530A (en) | High-temperature tempering and curing method of liquid slag and equipment system of method | |
| CN202297357U (en) | Hydraulic sputtering crushing device for high-temperature fused quartz lumps | |
| CN106755662B (en) | The resource recovery device and method of Copper converter smelting slag |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |