Method for comprehensive utilization of fly ash and slag and slag reaction cell device

Abstract

The present application belongs to the technical field of blast furnace ironmaking, and discloses a slag reaction pool device and a comprehensive utilization method of dust ash and slag. The reaction pool assembly of the slag reaction pool device comprises a pool body and an enclosure. The enclosure cover is arranged above the pool body to close the reaction cavity. The reaction pool assembly is provided with a slag inlet, a molten iron outlet and a slag discharge port which are all connected with the reaction cavity. The slag inlet is connected with the slag outlet of the blast furnace, and the molten iron outlet is arranged at the bottom of the pool body. The dust ash spraying assembly is arranged to collect the dust ash discharged from the blast furnace and spray it into the reaction cavity. The air supply assembly is connected with the reaction cavity. The fan is arranged to suck external air into the reaction cavity to make the dust ash and the slag have a combustion reaction. The molten iron generated by the combustion reaction is discharged through the molten iron outlet, and the recovered slag is discharged through the slag discharge port. The slag reaction pool device and the comprehensive utilization method of dust ash and slag recover the iron in the dust ash and the slag discharged from the blast furnace, and reduce the content of iron and other harmful elements in the dust ash.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of blast furnace ironmaking, and particularly relates to a slag reaction tank device and a comprehensive utilization method of dust and slag. BACKGROUND

[0002] The core product of blast furnace production is molten iron, and by-products include dust and slag. The iron content of dust is usually as high as 30%, and the carbon content is as high as 40%; the iron content in blast furnace slag is as high as 1.5%. Moreover, when the furnace temperature is relatively low and the slag-iron separation effect is insufficient, the iron content in the slag will further increase.

[0003] Dust and slag iron can be recycled. Dust is commonly used as fuel in sintering, steelmaking and other processes to provide heat energy by using the combustible properties of dust. However, the ash, heavy metals and other components in the dust will have a great impact on the quality of sintered ore when they are used again in the sintering, steelmaking and other processes; especially harmful elements such as alkali metals, lead and zinc are brought into the sintered ore in the sintering process and return to the blast furnace smelting again, and the harmful elements are cyclically enriched between processes, which adversely affects production. Similarly, when dust is used in the steelmaking process, harmful elements will enter the molten steel, which will also cause the quality of the molten steel to deteriorate and affect the quality of subsequent rolled products.

[0004] Under the existing technical conditions, slag is usually quenched with water and used as a construction material, such as cement preparation. A large amount of iron in the dust and slag is not effectively recovered, resulting in an increase in the cost of molten iron in the blast furnace. SUMMARY

[0005] The purpose of the present application is to provide a slag reaction tank device and a comprehensive utilization method of dust and slag, which can solve the problem that a large amount of iron in the dust and slag produced by the existing blast furnace is not effectively recovered, resulting in an increase in the cost of molten iron, and the use of dust as fuel in the sintering, steelmaking and other processes causes harmful elements to affect product quality and adversely affect production.

[0006] To achieve this purpose, the present application adopts the following technical solutions:

[0007] Firstly, a slag reaction tank device is provided for making the dust and slag discharged from the blast furnace undergo a combustion reaction, and the slag reaction tank device comprises:

[0008] A reaction tank assembly, the reaction tank assembly comprises a tank body and an enclosure, the tank body has a reaction cavity inside, and the enclosure is arranged above the tank body to close the reaction cavity, the reaction tank assembly is provided with a slag inlet, a molten iron outlet and a slag discharge port which all communicate with the reaction cavity, the slag inlet communicates with the slag outlet of the blast furnace, the molten iron outlet is arranged at the bottom of the tank body, and the molten iron outlet can be selectively opened;

[0009] A dust ash spraying assembly is communicated with the reaction cavity, and is arranged to collect the dust ash discharged from the blast furnace and spray into the reaction cavity;

[0010] An air supply assembly is communicated with the reaction cavity, and comprises a fan arranged to suck external air into the reaction cavity to cause the dust ash and the slag to have a combustion reaction;

[0011] The molten iron generated by the combustion reaction is discharged through the molten iron outlet, and the recovered slag is discharged through the slag discharge port.

[0012] As an optional structure of the present application, the bottom of the pool body is provided with a plurality of accommodating grooves and a plurality of reaction protrusions, the accommodating grooves are communicated with the reaction cavity, and the reaction protrusions are protruded from the bottom of the pool body towards the direction of the cover, and the plurality of accommodating grooves and the plurality of reaction protrusions are sequentially and spacedly arranged.

[0013] As an optional structure of the present application, the height of the slag discharge port is greater than the top height of the reaction protrusion.

[0014] As an optional structure of the present application, the air supply assembly further comprises an air suction pipeline, one end of the air suction pipeline is communicated with the reaction cavity, and the other end is communicated with a blast furnace raw material preheating mechanism, and the air suction pipeline is arranged to guide the hot gas flow generated by the combustion reaction to preheat the raw material of the blast furnace.

[0015] As an optional structure of the present application, the air supply assembly further comprises an air supply pipeline connected to the fan, one end of the air supply pipeline is communicated with the reaction cavity, a plurality of adjusting holes are formed in the air supply pipeline, the adjusting holes are communicated with external air, and the adjusting holes can be selectively opened; and / or,

[0016] The air volume of the fan is adjustable.

[0017] As an optional structure of the present application, the dust ash spraying assembly further comprises a collecting box and a blowing pipe connected to the collecting box, the collecting box is used to contain the dust ash, one end of the blowing pipe away from the collecting box extends into the reaction cavity, the blowing pipe is a flexible and telescopic hose, and the outlet of the blowing pipe is arranged to be capable of pointing to any position of the pool body.

[0018] Secondly, a dust ash and slag comprehensive utilization method is provided, which applies the slag reaction pool device as described above, and the dust ash and slag comprehensive utilization method comprises:

[0019] The dust and slag discharged from the blast furnace are introduced into the reaction cavity of the slag reaction pool device, and external air is sucked into the reaction cavity, the dust and slag are combusted, the molten iron produced by the combustion is discharged through the molten iron outlet of the slag reaction pool device, and the recovered slag is discharged through the slag discharge port.

[0020] As an optional embodiment of the present application, the introduction of the dust and slag discharged from the blast furnace into the reaction cavity of the slag reaction pool device and the sucking of external air into the reaction cavity specifically comprises the following steps:

[0021] S11, before the slag is discharged from the blast furnace, the dust spraying assembly of the slag reaction pool device uniformly sprays and lays the collected dust on the bottom of the pool body;

[0022] S12, the fan is turned on to suck external air into the reaction cavity, and the dust starts to combust, and the fan uses minimum power;

[0023] S13, the blast furnace discharges the slag into the reaction cavity, and gradually increases the power of the fan.

[0024] As an optional embodiment of the present application, the bottom of the pool body is provided with a plurality of accommodating grooves and a plurality of reaction protrusions, the accommodating grooves are communicated with the reaction cavity, the reaction protrusions are protruded from the bottom of the pool body towards the direction of the cover, the plurality of accommodating grooves and the plurality of reaction protrusions are sequentially and spacedly arranged, and the height of the slag discharge port is greater than the top height of the reaction protrusions;

[0025] The combustion of the dust and the slag includes the following steps:

[0026] S21, the dust and the slag combust and generate molten iron, and the molten iron is deposited in the pool body;

[0027] S22, when the liquid level of the molten iron exceeds the top of the reaction protrusion, the dust spraying assembly of the slag reaction pool device is turned on again to spray the dust into the reaction cavity.

[0028] As an optional embodiment of the present application, the discharge of the molten iron produced by the combustion reaction through the molten iron outlet of the slag reaction pool device comprises the following steps:

[0029] S31, according to the mass of the dust and the slag that have entered the reaction cavity, the mass and the liquid level of the molten iron in the reaction cavity are calculated;

[0030] S32, when the liquid level of the molten iron approaches the height of the slag discharge port, the molten iron outlet is opened to discharge the molten iron;

[0031] S33, when the amount of molten iron is discharged to reach the calculated mass, the molten iron outlet is blocked.

[0032] The beneficial effects of the present application are:

[0033] The slag reaction pool device provided by the present application comprises a reaction pool assembly, a dust ash spraying assembly and an air supply assembly. The reaction pool assembly comprises a pool body and an enclosure, the pool body has a reaction cavity therein, and the enclosure is arranged above the pool body to enclose the reaction cavity. The reaction pool assembly is provided with a slag inlet, a molten iron outlet and a slag discharge port, all of which communicate with the reaction cavity. The slag inlet communicates with the slag outlet of the blast furnace, the molten iron outlet is arranged at the bottom of the pool body, and the molten iron outlet can be selectively opened. The dust ash spraying assembly communicates with the reaction cavity, and is arranged to collect the dust ash discharged from the blast furnace and spray it into the reaction cavity. The air supply assembly communicates with the reaction cavity, and comprises a fan arranged to suck external air into the reaction cavity. The molten iron generated by the combustion reaction is discharged through the molten iron outlet, and the recovered slag is discharged through the slag discharge port. Specifically, the high-temperature slag enters the reaction pool, heats the dust ash, and the external air is sucked into the reaction cavity by the fan to provide sufficient oxygen for the combustion reaction process. The carbon and other metal elements in the dust ash begin to react under high temperature. The carbon-containing powder in the dust ash is burned and heated under the action of the high-temperature slag, further heating the slag. The slag generates molten iron during the combustion process, and simultaneously reduces the iron and other metal elements in the dust ash. On the one hand, the generated molten iron recovers the iron in the dust ash and slag, improves the output of the blast furnace, and reduces the production cost of the molten iron. On the other hand, the content of iron and other harmful elements in the dust ash is reduced, avoiding the influence on the quality of sintering, steelmaking and other products during the recycling process, and reducing the adverse effects on the blast furnace steelmaking production.

[0034] The dust ash and slag comprehensive utilization method provided by the present application applies the slag reaction pool device as described above, so that the dust ash and slag discharged from the blast furnace are subjected to combustion reaction again. The slag generates molten iron during the combustion process, and simultaneously reduces the iron and other metal elements in the dust ash. On the one hand, the generated molten iron recovers the iron in the dust ash and slag, improves the output of the blast furnace, and reduces the production cost of the molten iron. On the other hand, the content of iron and other harmful elements in the dust ash is reduced, avoiding the influence on the quality of sintering, steelmaking and other products during the recycling process, and reducing the adverse effects on the blast furnace steelmaking production. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 FIG. 1 is a structural schematic diagram of a slag reaction pool device provided by an embodiment of the present application.

[0036] In the figure:

[0037] 1, reaction cell assembly; 11, cell body; 12, cover; 111, reaction cavity; 112, slag inlet; 113, molten iron outlet; 114, slag discharge port; 115, accommodating groove; 116, reaction protrusion; 2, dust spraying assembly; 21, collection box; 22, blowing pipe; 3, air supply assembly; 31, fan; 32, air suction pipeline; 33, air supply pipeline;

[0038] 100, blast furnace raw material preheating mechanism. DETAILED DESCRIPTION

[0039] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0040] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and moreover, the "above", "above" and "above" of the first feature on the second feature include the first feature above and obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature on the second feature include the first feature below and obliquely below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0041] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0043] Example 1

[0044] like Figure 1 As shown, Embodiment 1 of the present invention provides a slag reaction tank device. The slag reaction tank device is used to cause the dust and slag discharged from the blast furnace to undergo a combustion reaction, so as to realize the dust and slag discharged from the blast furnace to react again to extract iron from the dust and slag, which greatly increases the output of the blast furnace.

[0045] The slag reaction tank device includes a reaction tank assembly 1, a dust removal ash spraying assembly 2, and an air supply assembly 3. The reaction tank assembly 1 includes a tank body 11 and a cover 12. The tank body 11 contains a reaction chamber 111. The cover 12 covers the tank body 11 to enclose the reaction chamber 111. The reaction tank assembly 1 has a slag inlet 112, a molten iron outlet 113, and a slag discharge outlet 114, all connected to the reaction chamber 111. The slag inlet 112 connects to the slag outlet of the blast furnace. The molten iron outlet 113 is located at the bottom of the tank body 11 and can be selectively opened. The dust removal ash spraying assembly 2 connects to the reaction chamber 111 and is configured to collect the dust removed from the blast furnace and spray it into the reaction chamber 111. The air supply assembly 3 connects to the reaction chamber 111 and includes a fan 31, which is configured to draw external air into the reaction chamber 111. The molten iron produced by the combustion reaction is discharged through the molten iron outlet 113, and the recovered slag is discharged through the slag discharge outlet 114. Specifically, the high-temperature slag enters the reaction tank to heat the dust collector ash. External air is drawn into the reaction chamber 111 by the blower 31, ensuring sufficient oxygen for the combustion reaction. The carbon and other metal elements in the dust collector ash begin to react at high temperatures. The carbon-containing powder in the dust collector ash burns and releases heat under the action of the high-temperature slag, further heating the slag. Molten iron is generated during the slag combustion process, and the iron and other metal elements in the dust collector ash are simultaneously reduced. On the one hand, the generated molten iron recovers the iron from the dust collector ash and slag, increasing blast furnace output and reducing the cost of molten iron production. On the other hand, it reduces the content of iron and other harmful elements in the dust collector ash, avoiding the impact on the quality of sintering, steelmaking, and other products during the recycling process, and reducing the adverse effects on blast furnace steelmaking production.

[0046] Optionally, the slag discharge port 114 is normally open, and the molten iron outlet 113 is sealed with water-soaked mud. When the dust and slag undergo a combustion reaction, resulting in a large amount of molten iron accumulating in the reaction chamber 111, the molten iron outlet 113 can be opened to discharge the molten iron when the liquid level of the accumulated molten iron is about to rise to the slag discharge port 114.

[0047] Optionally, the cover 12 has a certain space, so that the external air sucked by the fan 31 can fully enter the reaction cavity 111 to achieve the combustion supporting effect.

[0048] The bottom of the pool body 11 is provided with a plurality of accommodating grooves 115 and a plurality of reaction protrusions 116. The accommodating grooves 115 are communicated with the reaction cavity 111, and the reaction protrusions 116 are protruded from the bottom of the pool body 11 towards the cover 12. The plurality of accommodating grooves 115 and the plurality of reaction protrusions 116 are sequentially and spacedly arranged. The number of the accommodating grooves 115 and the reaction protrusions 116 is set according to the area of the bottom of the pool body 11, which is not limited by the drawings of the embodiment. The depth of the accommodating grooves 115 is generally 40-50 mm, and the height of the reaction protrusions 116 is generally 40-50 mm, that is, the height difference between the lowest point of the accommodating grooves 115 and the highest point of the reaction protrusions 116 is about 80-100 mm. As shown in FIG. 1, Figure 1 The H1 in the figure is the depth of the lowest point of the accommodating grooves 115 relative to the bottom of the pool body 11, and the H2 in the figure is the height of the highest point of the reaction protrusions 116 relative to the bottom of the pool body 11. The molten iron will accumulate at the bottom of the pool body 11 under the action of gravity, and the arrangement of the plurality of accommodating grooves 115 and the plurality of reaction protrusions 116 is beneficial to the better separation of the molten iron and the upper layer of slag.

[0049] In order to discharge the molten iron more thoroughly, the molten iron outlet 113 can be arranged at the bottom of the accommodating groove 115, and one molten iron outlet 113 is arranged at the bottom of each accommodating groove 115. The aperture of the molten iron outlet 113 is 30-40 mm.

[0050] The height of the slag discharge port 114 is greater than the top height of the reaction protrusion 116, and the height of the slag discharge port 114 can be slightly greater than the top height of the reaction protrusion 116. Exemplarily, taking the bottom of the pool body 11 as a reference, the height of the slag discharge port 114 is 100 mm, and the top height of the reaction protrusion 116 is 80 mm. Figure 1 The H3 in the figure is the height of the slag discharge port 114 relative to the bottom of the pool body 11, and the H2 is the height of the highest point of the reaction protrusion 116 relative to the bottom of the pool body 11.

[0051] The air supply assembly 3 further comprises an air suction duct 32, one end of the air suction duct 32 being communicated with the reaction chamber 111, and the other end being communicated with the blast furnace raw material preheating mechanism 100. The air suction duct 32 is arranged to guide the hot gas flow generated by the combustion reaction to preheat the raw material of the blast furnace, save the fuel for preheating the raw material of the blast furnace, and reduce the fuel consumption of the blast furnace, thereby saving energy. Since the reaction chamber 111 is relatively closed, when the combustion reaction of the dust and the slag occurs, the pressure in the reaction chamber 111 rises, which will promote the hot gas flow generated by the combustion reaction to enter the blast furnace raw material preheating mechanism 100 through the air suction duct 32. Of course, an air suction motor can also be arranged on the air suction duct 32 to make the hot gas flow more smooth.

[0052] The air supply assembly 3 further comprises an air supply duct 33 connected to the fan 31, one end of the air supply duct 33 being communicated with the reaction chamber 111. A plurality of adjusting holes are arranged on the air supply duct 33, the adjusting holes being communicated with the external air and being selectively openable. The adjusting holes can be controlled to be opened or closed by a valve, so as to adjust the gas flow entering the reaction chamber 111 through the air supply duct 33, and further control the reaction temperature in the reaction chamber 111.

[0053] Optionally, the air volume of the fan 31 is adjustable. By changing the air volume of the fan 31, the effect of adjusting the combustion temperature can be achieved more quickly. The more the adjusting holes are opened and the larger the air volume of the fan 31 is, the higher the temperature in the reaction chamber 111 is. During the reaction process, if the temperature of the slag decreases, the spraying amount of the dust is appropriately increased, and the slag in the reaction chamber 111 is kept in a liquid state, so that the combustion can be continued.

[0054] Since the working temperature of the blast furnace raw material preheating mechanism 100 cannot be too high, the air suction temperature of the air suction duct 32 needs to be adjusted and controlled. A temperature sensor is arranged on the air suction duct 32 to detect the temperature of the hot gas flow. When the detected temperature is too high, the opening number of the adjusting holes of the air supply duct 33 and the air volume of the fan 31 are controlled to control the intensity of the combustion reaction, and thereby the temperature of the hot gas flow is adjusted. Optionally, in some embodiments, a mixed air port communicated with the external air is arranged on the air suction duct 32 to adjust the temperature of the hot gas flow in the air suction duct 32 more quickly. Generally, when the temperature of the recovered hot gas flow is greater than 300°C, the mixed air port on the air suction duct 32 needs to be opened to suck in the external cold air, and the temperature can be controlled to be below 300°C.

[0055] The dust spraying assembly 2 further comprises a collecting box 21 for containing the dust and a blowing pipe 22 connected to the collecting box 21, the blowing pipe 22 extends into the reaction cavity 111 from the end of the collecting box 21, the blowing pipe 22 is a flexible and retractable hose, and the outlet of the blowing pipe 22 is arranged to be capable of spraying towards any position of the pool body 11. The collected dust is sieved by a sieve with a mesh size of 3mm*3mm to remove impurities, and then the dust is loaded into the collecting box 21. The collecting box 21 is provided with a compressed air blower, and the dust can be sprayed in a long-distance and multi-point manner in the reaction cavity 111 through the retractable blowing pipe 22. The collecting structure of the dust, the spraying structure of the compressed air blower and the retractable structure of the blowing pipe 22 can be arranged according to the prior art, which is not the focus of the present application, and will not be described here.

[0056] Embodiment two

[0057] The dust and slag comprehensive utilization method provided by the embodiment one of the present application uses the slag reaction pool device in the embodiment one. The dust and slag comprehensive utilization method comprises:

[0058] The dust and slag discharged from the blast furnace are introduced into the reaction cavity 111 of the slag reaction pool device, and external air is sucked into the reaction cavity 111, so that the dust and slag are subjected to a combustion reaction. Molten iron generated by the combustion reaction is discharged through the molten iron outlet 113 of the slag reaction pool device, and the generated recovered slag is discharged through the slag discharge port 114.

[0059] The dust and slag comprehensive utilization method of the embodiment makes the dust and slag discharged from the blast furnace undergo a combustion reaction again. The carbon and other metal elements in the dust start to react under high temperature. The carbon-containing powder in the dust is combusted and releases heat under the action of the high-temperature slag, thereby further heating the slag. Molten iron is generated during the combustion of the slag, and the iron and other metal elements in the dust are reduced at the same time. On the one hand, the generated molten iron recovers the iron in the dust and slag, thereby improving the output of the blast furnace and reducing the production cost of the molten iron. On the other hand, the content of iron and other harmful elements in the dust is reduced, thereby avoiding the influence on the quality of sintering, steelmaking and other products during the recycling process and reducing the adverse effects on the production of the blast furnace.

[0060] The dust and slag discharged from the blast furnace are introduced into the reaction cavity 111 of the slag reaction pool device, and external air is sucked into the reaction cavity 111, which specifically comprises the following steps:

[0061] S11, before the slag is discharged from the blast furnace, the dust spraying assembly 2 of the slag reaction pool device uniformly sprays and lays the collected dust on the bottom of the pool body 11, and the laying thickness of the dust is 10mm-20mm.

[0062] S12, open the fan 31 to suck external air into the reaction cavity 111, and in the case of sufficient oxygen, the dust ash starts to burn, which plays a combustion-supporting effect. At this time, the fan 31 uses the minimum power to avoid stirring up too much dust ash. The opening time of the fan 31 is about 1-2 minutes before the slag enters the reaction cavity 111, to avoid too long time causing the dust ash to burn out. As the intensity of the combustion increases, the power of the fan 31 is gradually increased.

[0063] S13, the blast furnace discharges slag into the reaction cavity 111, and the power of the fan 31 is gradually increased to help the slag quickly participate in the combustion.

[0064] The bottom of the pool body 11 of the slag reaction pool device is provided with a plurality of accommodating grooves 115 and a plurality of reaction protrusions 116. The accommodating grooves 115 are communicated with the reaction cavity 111, and the reaction protrusions 116 are protruded from the bottom of the pool body 11 towards the direction of the cover 12. The plurality of accommodating grooves 115 and the plurality of reaction protrusions 116 are sequentially and spacedly arranged. The height of the slag discharge port 114 is greater than the top height of the reaction protrusion 116. The molten iron and the upper slag are better separated through the arrangement of the plurality of accommodating grooves 115 and the plurality of reaction protrusions 116. The combustion reaction of the dust ash and the slag includes the following steps:

[0065] S21, the dust ash and the slag undergo a combustion reaction and generate molten iron, which is deposited in the pool body 11;

[0066] S22, when the liquid level of the molten iron exceeds the top of the reaction protrusion 116, the dust ash spraying assembly 2 is opened again to spray dust ash into the reaction cavity 111. The position of the blowing pipe 22 of the dust ash spraying assembly 2 is adjusted so that the dust ash spraying point is directly opposite the landing point of the slag entering the reaction cavity 111, so that the flow of the slag drives the mixed flow of the dust ash and participates in the reaction. According to the flow of the slag, 50 kg of dust ash is sprayed for every ton of slag flowing into the reaction cavity 111 to perform cyclic spraying.

[0067] The molten iron generated by the combustion reaction is discharged through the molten iron outlet 113 of the slag reaction pool device, including the following steps:

[0068] S31, according to the mass of the dust ash and the slag that have entered the reaction cavity 111, the mass and the liquid level of the molten iron in the reaction cavity 111 are calculated.

[0069] S32, when the liquid level of the molten iron approaches the height of the slag discharge port 114, the molten iron outlet 113 is opened to discharge the molten iron.

[0070] S33, when the amount of discharged molten iron reaches the calculated mass, the molten iron outlet 113 is blocked.

[0071] The calculation method is as follows:

[0072] According to the mass of the dust added and the mass of the slag already entered into the reaction cavity 111, the mass of the molten iron generated in the reaction cavity 111 is preliminarily calculated. For example, it is known that the iron content in the dust is 30%, the iron content in the slag is 1.2%, the dust participating in the combustion reaction is 10 tons, the slag is 30 tons, and the molten iron generated after the reaction is expected to be 3.36 tons.

[0073] The density of the molten iron is 7 tons / m 3 According to the calculation, the bottom area of the reaction cavity 111 is known, and the height H of the molten iron deposited in the reaction cavity 111 can be obtained. When H approaches the slag discharge port 114, the molten iron outlet 113 blocked by the water gun is opened, and the generated molten iron is discharged into the ladle. When the discharge amount reaches 3.36 tons, the molten iron outlet 113 is blocked again using the water gun.

[0074] When the liquid level of the slag in the reaction cavity 111 reaches the position of the slag discharge port 114, the high-temperature slag will automatically flow into the slag channel and enter the water quenching system. The high-temperature slag after the reaction is water quenched to obtain water slag, which can be used as a basic raw material for making cement and the like.

[0075] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the scope of the present application. It is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A slag reaction cell apparatus for causing a combustion reaction of dust and slag discharged from a blast furnace, characterized by, The slag reaction pool device comprises: a reaction pool assembly (1) comprising a pool body (11) having a reaction cavity (111) therein and a cover (12) covering the pool body (11) to enclose the reaction cavity (111), the reaction pool assembly (1) being provided with a slag inlet (112), a molten iron outlet (113) and a slag discharge port (114) all communicating with the reaction cavity (111), the slag inlet (112) communicating with a slag outlet of a blast furnace, the molten iron outlet (113) being selectively openable and arranged at a bottom of the pool body (11); a dust ash spraying assembly (2) communicating with the reaction cavity (111) and arranged to collect dust ash discharged from the blast furnace and spray the dust ash into the reaction cavity (111); an air supply assembly (3) communicating with the reaction cavity (111) and comprising a fan (31) arranged to suck external air into the reaction cavity (111) to cause the dust ash and the slag to have a combustion reaction; wherein molten iron generated by the combustion reaction is discharged through the molten iron outlet (113) and recovered slag is discharged through the slag discharge port (114).

2. The slag reaction cell apparatus of claim 1, wherein, The bottom of the pool body (11) is provided with a plurality of accommodating grooves (115) and a plurality of reaction protrusions (116), the accommodating grooves (115) communicating with the reaction cavity (111), the reaction protrusions (116) protruding from the bottom of the pool body (11) toward the cover (12), and the accommodating grooves (115) and the reaction protrusions (116) being arranged in sequence and at intervals.

3. The slag reaction cell apparatus of claim 2, wherein, The height of the slag discharge port (114) is greater than the top height of the reaction protrusions (116).

4. A slag reaction cell apparatus according to any one of claims 1 to 3, characterised in that, The air supply assembly (3) further comprises an air suction pipeline (32) having one end communicating with the reaction cavity (111) and the other end communicating with a blast furnace raw material preheating mechanism (100), the air suction pipeline (32) being arranged to guide hot air generated by the combustion reaction to preheat raw materials of the blast furnace.

5. A slag reaction cell apparatus according to any one of claims 1 to 3, characterised in that, The air supply assembly (3) further comprises an air supply pipeline (33) connected to the fan (31), one end of the air supply pipeline (33) communicating with the reaction cavity (111), the air supply pipeline (33) being provided with a plurality of adjusting holes communicating with external air, and the adjusting holes being selectively openable; and / or The air volume of the fan (31) is adjustable.

6. A slag reaction cell apparatus according to any one of claims 1 to 3, characterised in that, The dust removal spraying assembly (2) also includes a collection box (21) and a blow pipe (22) connected to the collection box (21). The collection box (21) is used to hold the dust removal ash. One end of the blow pipe (22) away from the collection box (21) extends into the reaction chamber (111). The blow pipe (22) is a flexible and retractable hose. The outlet of the blow pipe (22) is set to be able to face any position of the pool body (11).

7. A method for comprehensive utilization of dust ash and slag, characterized in that, The method for comprehensive utilization of dust and slag using the slag reaction tank device as described in any one of claims 1-6 includes: The dust and slag discharged from the blast furnace are introduced into the reaction chamber (111) of the slag reaction pool device and external air is drawn into the reaction chamber (111). The dust includes carbon-containing powder. The dust and slag undergo a combustion reaction. The molten iron produced by the combustion reaction is discharged through the molten iron outlet (113) of the slag reaction pool device. The recycled slag produced is discharged through the slag discharge port (114).

8. The method for comprehensive utilization of fly ash and slag according to claim 7, characterized in that, The process of introducing the dust and slag discharged from the blast furnace into the reaction chamber (111) of the slag reaction tank device and drawing external air into the reaction chamber (111) specifically includes the following steps: S11. Before the blast furnace discharges slag, the dust removal ash spraying component (2) of the slag reaction tank device sprays the collected dust removal ash evenly onto the bottom of the tank body (11). S12. Turn on the fan (31) to draw in outside air into the reaction chamber (111), and the dust starts to burn. The fan (31) uses minimum power. S13. The blast furnace discharges the slag into the reaction chamber (111) and gradually increases the power of the blower (31).

9. The method for comprehensive utilization of dust and slag according to claim 7, characterized in that, The bottom of the pool body (11) is provided with a plurality of accommodating grooves (115) and a plurality of reaction protrusions (116). The accommodating grooves (115) are connected to the reaction chamber (111). The reaction protrusions (116) protrude from the bottom of the pool body (11) toward the cover (12). The plurality of accommodating grooves (115) and the plurality of reaction protrusions (116) are arranged in sequence at intervals. The height of the slag discharge port (114) is greater than the top height of the reaction protrusions (116). The combustion reaction between the dust and the slag includes the following steps: S21, The dust and slag react to form molten iron, which is deposited in the pool (11); S22. When the liquid level of the molten iron exceeds the top of the reaction protrusion (116), the dust removal ash spraying component (2) of the slag reaction tank device is turned on again to spray the dust removal ash into the reaction chamber (111).

10. The method for comprehensive utilization of fly ash and slag according to claim 7, characterized in that, The molten iron produced by the combustion reaction is discharged through the molten iron outlet (113) of the slag reaction pool device, which includes the following steps: S31. Based on the mass of the dust and slag that have entered the reaction chamber (111), calculate the mass of the molten iron and the liquid level in the reaction chamber (111); S32, when the liquid iron level approaches the height of the slag discharge port (114), open the liquid iron outlet (113) to discharge the liquid iron; S33, when the discharged amount of the liquid iron reaches the calculated mass, block the liquid iron outlet (113).

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