CN115125349A - Direct pressure heat braising intelligent treatment method for molten iron pretreatment desulphurization slag - Google Patents
Direct pressure heat braising intelligent treatment method for molten iron pretreatment desulphurization slag Download PDFInfo
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- CN115125349A CN115125349A CN202210756577.XA CN202210756577A CN115125349A CN 115125349 A CN115125349 A CN 115125349A CN 202210756577 A CN202210756577 A CN 202210756577A CN 115125349 A CN115125349 A CN 115125349A
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- slag
- hot
- stewing
- steam
- desulphurization
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
- C21C1/025—Agents used for dephosphorising or desulfurising
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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
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- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
Abstract
The invention discloses an intelligent treatment method for molten iron pretreatment desulphurization slag. The method comprises the following steps: the method comprises the following steps: performing slurry spraying (10) on the inner side of the hot-stewed slag pot (1), and paving desulphurization slag particles (11) at the bottom of the hot-stewed slag pot (1); step two: the desulfurized slag is taken down into a hot stewing slag pot (1); step three: the upper cover (4) of the hot slag stewing tank is closed to form a closed space; step four: turning on the water spraying device (5), and spraying water into the hot stewing device (3); step five: the control device collects temperature values and pressure values in the thermal stewing device in real time during thermal stewing and transmits the collected data to the secondary system for analysis and processing; step six: when the temperature and the pressure in the thermal stewing device (3) reach the preset standard, the steam collecting device (6) is opened for collecting the steam. The water sprayed into the hot stewing device is contacted with the desulphurization slag in the hot stewing device, so that the water is vaporized into steam, and the steam is used for heat recovery, thereby shortening the prior process flow and recovering heat and more iron elements.
Description
Technical Field
The invention relates to the technical field of slag treatment, in particular to an intelligent treatment method for molten iron pretreatment desulphurization slag.
Background
The molten iron pretreatment desulphurization can be carried out outside the molten iron furnace before the steelmaking process, so that the sulfur content in the molten iron reaches a lower level before entering a converter, thereby reducing the desulphurization pressure of steelmaking and refining, improving the product quality and the service performance of steel and effectively improving the economic and technical level of steelmaking. The molten iron pretreatment desulphurization has obvious advantages in the aspects of improving the steel performance, reducing the steel-making desulphurization cost, producing high-quality steel and the like, and becomes one of the necessary procedures in the production flow of modern iron and steel enterprises. By using a KR method of a calcium-based desulfurizer, 9-12 kg of desulfurized slag is generated per ton of iron in the desulfurization process, and a large amount of sensible heat of the slag is contained.
At present, the mainstream desulphurization slag treatment process mainly comprises a hot stewing method, a hot splashing method and the like, which not only has poor treatment effect, but also consumes a large amount of water resources. Because the desulfurization slag contains higher sulfur content, serious environmental pollution is easily caused, and sensible heat contained in the slag is not recycled, so that serious heat waste is caused.
The method has the advantages that the hot desulphurization slag is subjected to pressure heat braising treatment by a direct pressure heat braising intelligent treatment method based on automatic and intelligent technical means, and the sensible heat of the slag in the hot desulphurization slag is recovered, so that the method has important significance.
Disclosure of Invention
In order to overcome the defects, the intelligent treatment method for the desulphurization slag in the molten iron pretreatment disclosed by the invention carries out pressure heat braising treatment on the thermal-state desulphurization slag through a direct pressure heat braising intelligent treatment method based on automatic and intelligent technical means, recovers the sensible heat of the slag in the thermal-state desulphurization slag, and carries out secondary treatment on the desulphurization slag subjected to pressure heat braising so as to realize efficient and intelligent waste heat recovery of the desulphurization slag.
In order to achieve the purpose, the invention discloses an intelligent treatment method of molten iron pretreatment desulphurization slag, which comprises the following steps:
the method comprises the following steps: slurry spraying (10) is carried out on the inner side of the hot-stewed slag pot (1), and desulphurization slag particles (11) are laid at the bottom of the hot-stewed slag pot (1);
step two: the desulfurized slag is taken down into a hot stewing slag pot (1);
step three: the upper cover (4) of the hot stewing slag pot is closed to form a closed space;
step four: turning on the water spraying device (5), and spraying water into the hot stewing device (3);
step five: the control device collects temperature values and pressure values inside the thermal stewing device in real time during thermal stewing and transmits the collected data to the secondary system for analysis and processing;
step six: when the temperature and the pressure in the thermal stewing device (3) reach the preset standards, the steam collecting device (6) is opened for steam collection.
Furthermore, the thickness of the slurry (10) sprayed on the inner side of the hot-stewed slag tank (1) is 5-8 cm, and the particle size of the desulphurization slag particles (11) laid at the bottom is 1-3 cm, and the thickness range is 8-10 cm.
Further, the desulfurization slag (2) comprises the following components: 40-50 parts of CaO and SiO 2 10 to 20 portions of Al 2 O 3 2-8 parts of MgO, 5-10 parts of TFe, 15-25 parts of S and 2-4 parts of S, and the temperature is about 1200-1300 ℃.
Further, in the sixth step, when the temperature of the steam is more than or equal to 250 ℃ and the pressure is less than 0.3MPa, the steam collecting device (6) is opened.
Further, in the sixth step, when the temperature of the steam is less than 100 ℃ and the pressure is less than 0.1MPa, the collection of the steam is stopped.
The control device is a PLC and/or a computer, the PLC and the computer can intelligently control the switch of the water spraying device, meanwhile, the temperature measuring device and the pressure measuring device are arranged in the heat stewing device, the pressure value and the temperature value of steam can be collected in real time, and the pressure value and the temperature value are transmitted to the PLC and the computer for processing.
Further, the seventh step: a treatment cycle of water spraying, vaporizing, and steam collecting is about 30min, which is determined by the temperature and pressure of the steam in the thermal soaking device.
Further, the step eight: the treatment period of the desulphurization slag pretreated by the molten iron in one batch is 6-8 h, and is determined according to the temperature of the desulphurization slag.
Furthermore, the hot metal pretreatment desulphurization slag can recover steam and carry out secondary treatment on the residual desulphurization slag through hot stewing.
In order to achieve the aim, the intelligent treatment device for the molten iron pretreatment desulphurization slag comprises a hot stewing device and a hot stewing slag tank arranged in the hot stewing device; a closed cover is arranged at the opening of the thermal braising device; the closed cover is provided with a water spraying device which is communicated with a water inlet pipeline; a mud layer is sprayed on the side arm in the hot-stewing slag tank, and desulphurization slag particles are paved at the bottom of the hot-stewing slag tank; the sealed cover is also provided with a steam collecting pipeline, and the steam collecting pipeline is provided with a controlled valve.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
according to the invention, water sprayed into the thermal braising device is contacted with the desulphurization slag in the thermal braising device, so that the water is vaporized into steam, the steam is used for heat recovery, the desulphurization slag is recycled, and the desulphurization slag in the rest thermal braising device is subjected to secondary treatment, so that the existing process flow is shortened, the heat in the desulphurization slag is recovered, more iron elements are recovered, and a remarkable technical effect is achieved; the invention also saves the resource waste, saves the field utilization, reduces the environmental pollution and reduces the investment cost; in addition, through intelligent control, the labor cost is reduced, the generation efficiency is improved, and the method has remarkable progress.
Drawings
FIG. 1 is an overall block diagram of the present invention;
in the figure: 1. thermally stewing the slag tank; 2. desulfurizing slag; 3. a thermal braising device; 4. covering the thermal stewing device; 5. a water spraying device; 6. a steam collection device; 7. a temperature and pressure measuring device; 8. a PLC machine; 9. a computer; 10. slurry; 11. desulfurizing slag particles.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As can be seen from fig. 1, the intelligent treatment method for molten iron pretreatment desulphurization slag of the embodiment includes a hot-stewing slag tank 1 and a hot-stewing device 3, and includes the following steps:
the method comprises the following steps: spraying slurry 10 on the inner side of the hot slag stewing tank 1, paving desulphurization slag particles 11 at the bottom of the hot slag stewing tank 1, and arranging a hot stewing device 3 outside the hot slag stewing tank 1;
step two: after receiving the slag-raking signal, the hot-braising slag tank 1 is lifted to a slag tank car along the track in an automatic, manual or remote control mode of an unmanned crane, and is conveyed to a desulfurization station, and the desulfurization slag is raked into the hot-braising slag tank 1;
step three: an unmanned overhead traveling crane lifts the hot-braising slag tank 1 into a hot-braising device 3 of a slag treatment workshop through a rail in an automatic, manual or remote control mode, and the hot-braising device closes an upper cover 4 to form a closed space;
step four: turning on a water spraying device 5, spraying water into the hot stewing device, generating steam in the hot stewing device, and gradually increasing the temperature and the pressure;
step five: the inside of the hot stewing device is respectively provided with a pressure measuring device and a temperature measuring device 7, and is simultaneously butted with a PLC8 primary system, so that the temperature value and the pressure value inside the hot stewing device can be collected during hot stewing, the PLC8 is also butted with a computer 9 secondary system through an interface, and the collected data is synchronously transmitted to the secondary system for analysis and processing;
step six: acquiring a temperature value and a pressure value in the thermal braising device in real time through a PLC8 and a computer 9, and opening a steam collecting device 6 for collecting when the temperature and the pressure in the thermal braising device reach certain collectable standards, and repeatedly collecting steam;
step seven: opening the upper cover 4 of the thermal stewing device, lifting out the thermal stewing slag tank 1, and performing secondary utilization on the residual desulphurization slag;
step eight: waiting for the next batch of hot stewing slag pot to be transported, and repeating the steps;
the invention directly pours the desulphurization slag 2 into a hot stewing slag tank 1 which is sprayed with slurry 10 on the inner side and paved with desulphurization slag particles 11 at the bottom, hangs the hot stewing slag tank 1 into a hot stewing device 3, closes an upper cover 4 of the hot stewing device to form a closed system, and intelligently controls the processes of water spraying, vaporization and steam collection through an intelligent model to realize the heat recovery of steam.
The thickness range of the slurry 10 sprayed on the inner side of the hot-stewing slag tank 1 is 5-8 cm, the particle size of the desulphurization slag particles 11 laid at the bottom is 1-3 cm, the thickness is 8-10 cm, and the desulphurization slag hot-stewing treatment can be carried out.
The desulfurization slag 2 contains 40-50 parts of CaO and SiO 2 About 10 to 20 parts of Al 2 O 3 About 2 to 8 parts, about 5 to 10 parts of MgO, about 15 to 25 parts of TFe, about 2 to 4 parts of S, and warmThe degree ranges from about 1200 to about 1300 ℃.
And the unmanned crane receives the slag-raking signal, and the hot-braising slag tank 1 is hung to a desulfurization station through the track by the unmanned crane, so that the desulfurization slag is raked into the hot-braising slag tank 1.
The input end of the water spraying device 5 is connected with a PLC8 and a computer 9, and the opening and closing of the water spraying device 5 and the water spraying amount are intelligently controlled through the computer 9 and a PLC 8.
The temperature measuring device 7 and the pressure measuring device 7 are arranged at a plurality of positions of the thermal stewing device 3, and transmit real-time temperature and pressure data acquisition and transmission to the PLC8 and the computer 9.
And sixthly, when the temperature of the steam is more than or equal to 250 ℃ and the pressure is less than 0.3Mpa, automatically opening the steam collecting device 6 by the system, and collecting the steam in the thermal stewing device 3.
And step six, when the temperature of the steam is less than 100 ℃ and the pressure is less than 0.1MPa, automatically stopping collecting the steam by the system.
In the seventh step, the treatment period of water spraying, vaporization and steam collection is about 30min, which is determined according to the temperature and pressure of the steam.
Step eight: the treatment period of the molten iron pretreatment desulphurization slag is 6-8 h, and is determined according to the temperature of the desulphurization slag 2.
The heat of the desulphurization slag 2 is recycled through steam, the desulphurization slag can be used for power generation and other purposes, the designed intelligent models are used except for pouring and pouring the desulphurization slag 2 in the whole operation steps, intelligent control is performed through the computer 9 and the PLC8, the designed intelligent models have a self-learning function, the steam heat can be recycled through dynamically optimizing and adjusting the desulphurization slag thermal braising, the residual desulphurization slag resources can be secondarily utilized, and the efficiency of steam collection and molten iron pretreatment of the desulphurization slag is improved.
According to the invention, the desulphurization slag 2 sprayed into the hot braising device 3 is added with water to be vaporized into steam, a large amount of heat is generated, the steam is subjected to heat recovery, and the residual desulphurization slag is subjected to secondary treatment; the invention also saves the resource waste, saves the field utilization, reduces the environmental pollution and reduces the investment cost.
The invention directly carries out pressure heat braising treatment on the desulphurization slag 2, shortens the process flow, reduces the equipment investment, carries out the processes of intelligently controlling water spraying, vaporization, steam collection and the like through a PLC primary system and a computer secondary system, recovers the iron element in the desulphurization slag and the heat in the desulphurization slag, reduces the labor cost through intelligent control, provides the generation efficiency and has remarkable progress.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. An intelligent treatment method for molten iron pretreatment desulphurization slag is characterized in that: the method comprises the following steps:
the method comprises the following steps: performing slurry spraying (10) on the inner side of the hot-stewed slag pot (1), and paving desulphurization slag particles (11) at the bottom of the hot-stewed slag pot (1);
step two: the desulfurized slag is taken down into a hot stewing slag pot (1);
step three: the upper cover (4) of the hot slag stewing tank is closed to form a closed space;
step four: turning on the water spraying device (5), and spraying water into the hot stewing device (3);
step five: the control device collects temperature values and pressure values inside the thermal stewing device in real time during thermal stewing and transmits the collected data to the secondary system for analysis and processing;
step six: when the temperature and the pressure in the thermal stewing device (3) reach the preset standard, the steam collecting device (6) is opened for collecting the steam.
2. The intelligent treatment method of molten iron pretreatment desulphurization slag according to claim 1, characterized in that: the thickness of the slurry (10) sprayed on the inner side of the hot-stewed slag tank (1) is 5-8 cm, and the particle size of the desulphurization slag particles (11) laid at the bottom is 1-3 cm and the thickness range is 8-10 cm.
3. The intelligent treatment method of the molten iron pretreatment desulphurization slag according to claim 1, characterized in that: the desulfurization slag (2) comprises the following components: 40-50 parts of CaO and SiO 2 10 to 20 portions of Al 2 O 3 2-8 parts of MgO, 5-10 parts of MgO, 15-25 parts of TFe and 2-4 parts of S, and the temperature is about 1200-1300 ℃.
4. The intelligent treatment method for the molten iron pretreatment desulfurization slag according to claim 1, characterized in that: in the sixth step, when the temperature of the steam is more than or equal to 250 ℃ and the pressure is less than 0.3MPa, the steam collecting device (6) is opened.
5. The intelligent treatment method of the molten iron pretreatment desulphurization slag according to claim 1, characterized in that: and step six, stopping collecting the steam when the temperature of the steam is less than 100 ℃ and the pressure is less than 0.1 MPa.
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| CN202210756577.XA CN115125349A (en) | 2022-06-29 | 2022-06-29 | Direct pressure heat braising intelligent treatment method for molten iron pretreatment desulphurization slag |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115786603A (en) * | 2022-11-16 | 2023-03-14 | 上海宝钢节能环保技术有限公司 | Unmanned processing system of molten iron desulfurization sediment |
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