Slag reaction tank device and dedusting ash and slag comprehensive utilization method

Abstract

The invention belongs to the technical field of blast furnace ironmaking, and discloses a slag reaction tank device and a dedusting ash and slag comprehensive utilization method.The reaction tank assembly of the slag reaction tank device comprises a tank body and a sealing cover, the sealing cover covers the tank body to seal a reaction cavity, and the reaction tank assembly is provided with a slag inlet, a molten iron outlet and a slag discharge outlet which are all communicated with the reaction cavity; the molten iron outlet is formed in the bottom of the tank body; the dedusting ash spraying assembly is arranged to collect dedusting ash discharged by the blast furnace and spray the dedusting ash into the reaction cavity; the air supply assembly communicates with the reaction cavity, and the draught fan is arranged to suck external air into the reaction cavity so that the dedusting ash and the slag can be subjected to a combustion reaction. Wherein the molten iron generated by the combustion reaction is discharged through the molten iron outlet, and the generated recovered slag is discharged through the slag discharge port. According to the furnace slag reaction tank device and the comprehensive utilization method of the fly ash and the furnace slag, iron in the fly ash and the furnace slag discharged by the blast furnace is recycled, and the content of iron and other harmful elements in the fly ash is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnace ironmaking, and in particular to a slag reaction pool device and a method for comprehensive utilization of dust and slag. Background Art

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

[0003] Dust ash and slag iron will be recycled. Dust ash is generally used as fuel for sintering, steelmaking and other processes, using the combustible properties of dust ash to provide heat energy. However, the ash, heavy metals and other components in the dust ash are reused in sintering, steelmaking and other processes, which has a great impact on the quality of sintered ore. In particular, harmful elements such as alkali metals, lead and zinc are brought into the sintered ore during the sintering process and returned to the blast furnace for smelting. Harmful elements are circulated and enriched between processes, which has an adverse effect on production. Similarly, when dust ash is used in the steelmaking process, harmful elements will enter the molten steel. The same ash will cause the quality of the molten steel to deteriorate, affecting the quality of subsequent rolled products.

[0004] Under existing technical conditions, slag is usually used as infrastructure material after water quenching, such as cement production, etc. A large amount of iron in dust and slag is not effectively recovered, resulting in an increase in the cost of blast furnace hot metal. Summary of the invention

[0005] The purpose of the present invention is to provide a slag reaction pool device and a method for comprehensive utilization of dust ash and slag, which can solve the problems that a large amount of iron in the dust ash and slag produced by the existing blast furnace is not effectively recovered, resulting in increased molten iron costs, and the dust ash is used as fuel for sintering, steelmaking and other processes, resulting in harmful elements that affect product quality and have an adverse effect on production.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] First, a slag reaction pool device is provided, which is used to cause dust and slag discharged from a blast furnace to undergo combustion reaction, and the slag reaction pool device comprises:

[0008] A reaction pool assembly, the reaction pool assembly comprising a pool body and a sealing cover, the pool body having a reaction chamber, the sealing cover being arranged above the pool body to close the reaction chamber, the reaction pool assembly being provided with a slag inlet, a molten iron outlet and a slag discharge port all connected to the reaction chamber, the slag inlet being connected to the slag outlet of the blast furnace, the molten iron outlet being arranged at the bottom of the pool body, and the molten iron outlet being selectively openable;

[0009] A dust ash spraying assembly, the dust ash spraying assembly is connected to the reaction chamber, and the dust ash spraying assembly is configured to collect dust ash discharged from the blast furnace and spray it into the reaction chamber;

[0010] an air supply component, the air supply component being connected to the reaction chamber, the air supply component comprising a fan, the fan being configured to draw external air into the reaction chamber so as to cause a combustion reaction between the dust removal ash and the slag;

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

[0012] As an optional structure of the present invention, a plurality of accommodating grooves and a plurality of reaction protrusions are provided at the bottom of the cell body, the accommodating grooves are connected to the reaction chamber, the reaction protrusions protrude from the bottom of the cell body toward the sealing cover, and the plurality of accommodating grooves and the plurality of reaction protrusions are arranged in sequence and spaced apart.

[0013] As an optional structure of the present invention, 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 invention, the air supply assembly also includes an air suction duct, one end of the air suction duct is connected to the reaction chamber, and the other end is connected to the blast furnace raw material preheating mechanism, and the air suction duct is configured to guide the hot air flow generated by the combustion reaction to preheat the raw materials of the blast furnace.

[0015] As an optional structure of the present invention, the air supply assembly further includes an air supply duct, the air supply duct is connected to the fan, one end of the air supply duct is connected to the reaction chamber, a plurality of adjustment holes are opened on the air supply duct, the adjustment holes are connected to the outside air, and the adjustment holes can be selectively opened; and / or,

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

[0017] As an optional structure of the present invention, the dust removal ash spraying assembly also includes a collecting box and a blowing pipe connected to the collecting box, the collecting box is used to hold the dust removal ash, the blowing pipe extends into the reaction chamber at one end away from the collecting box, the blowing pipe is a flexible and retractable hose, and the outlet of the blowing pipe is configured to be able to face any position of the pool body.

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

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

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

[0021] S11, before the blast furnace is discharged, the dust ash spraying component of the slag reaction pool device sprays the collected dust ash evenly on the bottom of the pool body;

[0022] S12, turning on the fan to draw external air into the reaction chamber, the dust removal ash starts to burn, and the fan uses minimum power;

[0023] S13, the blast furnace discharges the slag into the reaction chamber, and the power of the fan is gradually increased.

[0024] As an optional embodiment of the present invention, the bottom of the pool body is provided with a plurality of accommodating grooves and a plurality of reaction protrusions, the accommodating grooves are connected to the reaction chamber, the reaction protrusions protrude from the bottom of the pool body toward the sealing cover, the plurality of accommodating grooves and the plurality of reaction protrusions are arranged in sequence, and the height of the slag discharge port is greater than the top height of the reaction protrusions;

[0025] The combustion reaction between the dust removal ash and the slag comprises the following steps:

[0026] S21, the dust removal ash and the slag undergo combustion reaction to 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 removal ash spraying assembly of the slag reaction pool device is turned on again to spray the dust removal ash into the reaction chamber.

[0028] As an optional embodiment of the present invention, the molten iron produced by the combustion reaction is discharged through the molten iron outlet of the slag reaction pool device, comprising the following steps:

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

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

[0031] S33. When the amount of molten iron discharged reaches the calculated mass, the molten iron outlet is blocked.

[0032] Beneficial effects of the present invention:

[0033] The slag reaction pool device provided by the present invention includes a reaction pool component, a dust removal ash spraying component and an air supply component. The reaction pool component includes a pool body and a sealing cover, the pool body has a reaction chamber, the sealing cover is arranged above the pool body to close the reaction chamber, the reaction pool component is provided with a slag inlet, a molten iron outlet and a slag discharge port all connected to the reaction chamber, the slag inlet is connected to 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 removal ash spraying component is connected to the reaction chamber, and the dust removal ash spraying component is arranged to collect the dust removal ash discharged from the blast furnace and spray it into the reaction chamber. The air supply component is connected to the reaction chamber, and the air supply component includes a fan, and the fan is arranged to suck external air into the reaction chamber. The molten iron produced by the combustion reaction is discharged through the molten iron outlet, and the generated recovered slag is discharged through the slag discharge port. Specifically, the high-temperature slag enters the reaction pool to heat the dust ash, and the external air is sucked into the reaction chamber by the fan, so that there is sufficient oxygen in the combustion reaction process. The carbon and other metal elements in the dust ash begin to react at high temperature. The carbon-containing powder in the dust 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 ash are simultaneously reduced. On the one hand, the generated molten iron recovers the iron in the dust ash and slag, increases the blast furnace output, and reduces the cost of molten iron production. On the other hand, it reduces the content of iron and other harmful elements in the dust ash, avoids the impact on the quality of sintering, steelmaking and other products during the recycling process, and reduces the adverse impact on blast furnace steelmaking production.

[0034] The method for comprehensive utilization of dust ash and slag provided by the present invention uses the slag reaction pool device as described above to make the dust ash and slag discharged from the blast furnace undergo combustion reaction again, generate molten iron during the combustion of the slag, and simultaneously reduce the iron element 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, increases the output of the blast furnace, and reduces the production cost of molten iron. On the other hand, it reduces the content of iron and other harmful elements in the dust ash, avoids the impact on the quality of products such as sintering and steelmaking during the recycling process, and reduces the adverse impact on blast furnace steelmaking production. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic structural diagram of a slag reaction pool device provided in an embodiment of the present invention.

[0036] In the figure:

[0037] 1. Reaction pool assembly; 11. Pool body; 12. Enclosure; 111. Reaction chamber; 112. Slag inlet; 113. Molten iron outlet; 114. Slag discharge port; 115. Accommodation groove; 116. Reaction protrusion; 2. Dust removal ash spraying assembly; 21. Collection box; 22. Blowing pipe; 3. Air supply assembly; 31. Fan; 32. Air suction duct; 33. Air supply duct;

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

[0039] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0043] Embodiment 1

[0044] like Figure 1 As shown, Embodiment 1 of the present invention provides a slag reaction pool device, which is used to cause a combustion reaction between dust ash and slag discharged from a blast furnace, so that the dust ash and slag discharged from the blast furnace react again to refine the iron in the dust ash and slag, thereby greatly increasing the output of the blast furnace.

[0045] The slag reaction pool device includes a reaction pool component 1, a dust removal ash spraying component 2 and an air supply component 3. The reaction pool component 1 includes a pool body 11 and a cover 12. The pool body 11 has a reaction chamber 111. The cover 12 is covered on the top of the pool body 11 to close the reaction chamber 111. The reaction pool component 1 is provided with a slag inlet 112, a molten iron outlet 113 and a slag discharge port 114 all connected to the reaction chamber 111. The slag inlet 112 is connected to the slag outlet of the blast furnace. The molten iron outlet 113 is arranged at the bottom of the pool body 11, and the molten iron outlet 113 can be selectively opened. The dust removal ash spraying component 2 is connected to the reaction chamber 111, and the dust removal ash spraying component 2 is configured to collect the dust removal ash discharged from the blast furnace and spray it into the reaction chamber 111. The air supply component 3 is connected to the reaction chamber 111, and the air supply component 3 includes a fan 31, and the fan 31 is configured to suck 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 generated recovered slag is discharged through the slag discharge port 114. Specifically, the high-temperature slag enters the reaction pool to heat the dust removal ash, and the external air is sucked into the reaction chamber 111 by the fan 31, so that there is sufficient oxygen for the combustion reaction process. The carbon and other metal elements in the dust removal ash begin to react at high temperature. The carbon-containing powder in the dust removal 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 removal ash are simultaneously reduced. On the one hand, the generated molten iron recovers the iron in the dust removal ash and slag, increases the blast furnace output, and reduces the cost of molten iron production. On the other hand, it reduces the content of iron and other harmful elements in the dust removal ash, avoids the impact on the quality of sintering, steelmaking and other products during the recycling process, and reduces the adverse impact on blast furnace steelmaking production.

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

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

[0048] The bottom of the cell 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, and the reaction protrusions 116 protrude from the bottom of the cell body 11 toward the sealing cover 12. The plurality of accommodating grooves 115 and the plurality of reaction protrusions 116 are arranged in sequence and at intervals. The number of accommodating grooves 115 and reaction protrusions 116 is set according to the bottom area of ​​the cell body 11, which is not limited to the drawings of this embodiment. The depth of the accommodating groove 115 is generally 40mm-50mm, and the height of the reaction protrusion 116 is generally 40mm-50mm, that is, the height difference between the lowest point of the accommodating groove 115 and the highest point of the reaction protrusion 116 is about 80mm-100mm. Figure 1 As shown in the figure, H1 is the depth of the lowest point of the receiving groove 115 relative to the bottom of the pool body 11, and H2 is the height of the highest point of the reaction protrusion 116 relative to the bottom of the pool body 11. Under the action of gravity, molten iron will accumulate at the bottom of the pool body 11, and the arrangement of multiple receiving grooves 115 and multiple reaction protrusions 116 is conducive to better separation of molten iron and upper slag.

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

[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 is slightly greater than the top height of the reaction protrusion 116. For example, with 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 H3 is the height of the slag discharge port 114 relative to the bottom of the pool body 11 , and 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 also includes an air suction duct 32, one end of which is connected to the reaction chamber 111, and the other end is connected to the blast furnace raw material preheating mechanism 100. The air suction duct 32 is configured to guide the hot air flow generated by the combustion reaction to preheat the raw materials of the blast furnace, save fuel for preheating the raw materials of the blast furnace, reduce the fuel consumption of the blast furnace, and be more energy-efficient. Since the reaction chamber 111 is relatively closed, when the dust removal ash and slag undergo a combustion reaction, the pressure in the reaction chamber 111 increases, which will cause the hot air 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 provided on the air suction duct 32 to make the hot air flow flow smoother.

[0052] The air supply assembly 3 also includes an air supply duct 33, which is connected to the fan 31, and one end of the air supply duct 33 is connected to the reaction chamber 111. The air supply duct 33 is provided with a plurality of adjustment holes, which are connected to the outside air and can be selectively opened. The adjustment holes can be opened or closed by a valve, thereby adjusting the gas flow entering the reaction chamber 111 through the air supply duct 33, and further controlling 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 adjustment holes are opened, the greater the air volume of the fan 31, and the temperature in the reaction chamber 111 increases. During the reaction process, if the slag temperature decreases, the spraying amount of dust removal ash is appropriately increased to keep the slag in the reaction chamber 111 in a liquid state, so that it can continue to burn.

[0054] Since the operating temperature of the blast furnace raw material preheating mechanism 100 cannot be too high, the suction temperature of the suction duct 32 needs to be adjusted and controlled. A temperature sensor is set on the suction duct 32 to detect the temperature of the hot air flow. When the detected temperature is too high, the intensity of the combustion reaction is controlled by controlling the number of opening holes of the air supply duct 33 and the air volume of the fan 31, and then the temperature of the hot air flow is adjusted. Optionally, in some embodiments, the suction duct 32 is provided with a mixing port connected to the outside air, so that the temperature of the hot air flow in the suction duct 32 is adjusted more quickly. Usually, when the temperature of the recovered hot air flow is greater than 300°C, it is necessary to open the mixing port on the suction duct 32 to inhale external cold air and control the temperature below 300°C.

[0055] The dust ash spraying assembly 2 also includes a collection box 21 and a blowing pipe 22 connected to the collection box 21. The collection box 21 is used to hold dust ash. The end of the blowing pipe 22 away from the collection box 21 extends into the reaction chamber 111. The blowing pipe 22 is a flexible and retractable hose. The outlet of the blowing pipe 22 is set to be able to face any position of the cell body 11. First, the collected dust ash is sieved with a sieve with an aperture of 3mm*3mm to remove the debris in the dust ash, and then the dust ash is loaded into the collection box 21. The collection box 21 is provided with a compressed air blower, and the dust ash is sprayed at a long distance and multiple points in the reaction chamber 111 through the retractable blowing pipe 22. The dust ash collection structure of the dust ash spraying assembly, the blowing structure of the compressed air blower, and the retractable structure of the blowing pipe 22 can be set with reference to the prior art. This is not the focus of this application, and this implementation will not be repeated here.

[0056] Embodiment 2

[0057] Embodiment 1 of the present invention provides a method for comprehensive utilization of dust ash and slag, using the slag reaction pool device in Embodiment 1. The method for comprehensive utilization of dust ash and slag includes:

[0058] The dust and slag discharged from the blast furnace are introduced into the reaction chamber 111 of the slag reaction tank device and the external air is sucked into the reaction chamber 111, the dust and slag undergo a combustion reaction, and the molten iron produced by the combustion reaction is discharged through the molten iron outlet 113 of the slag reaction tank device, and the produced recovered slag is discharged through the slag discharge port 114.

[0059] The method for comprehensive utilization of dust ash and slag of this embodiment causes the dust ash and slag discharged from the blast furnace to undergo combustion reaction again, and the carbon and other metal elements in the dust ash begin to react under high temperature. The carbon-containing powder in the dust ash burns and releases heat under the action of the high-temperature slag, further heating the slag, generating molten iron during the slag combustion process, and simultaneously reducing 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, increases the output of the blast furnace, and reduces the production cost of molten iron. On the other hand, it reduces the content of iron and other harmful elements in the dust ash, avoids the impact on the quality of products such as sintering and steelmaking during the recycling process, and reduces the adverse impact on blast furnace steelmaking production.

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

[0061] S11. Before the blast furnace is discharged from the slag tank, the dust removal ash spraying assembly 2 of the slag reaction tank device evenly sprays the collected dust removal ash on the bottom of the tank body 11; the dust removal ash is laid with a thickness of 10mm-20mm.

[0062] S12, turn on the fan 31 to draw external air into the reaction chamber 111. When there is sufficient oxygen, the dust ash starts to burn, which has a combustion-supporting effect. At this time, the fan 31 uses the minimum power to avoid raising too much dust ash. The fan 31 is turned on about 1 to 2 minutes before the slag enters the reaction chamber 111 to avoid burning out the dust ash for too long. As the intensity of the combustion increases, the power of the fan 31 is gradually increased.

[0063] S13, the slag discharged from the blast furnace enters the reaction chamber 111, and the power of the fan 31 is gradually increased to help the slag to quickly participate in 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 connected to the reaction chamber 111, the reaction protrusions 116 are protruded from the bottom of the pool body 11 toward the sealing cover 12, the plurality of accommodating grooves 115 and the plurality of reaction protrusions 116 are arranged in sequence, the height of the slag discharge port 114 is greater than the top height of the reaction protrusion 116, and the arrangement of the plurality of accommodating grooves 115 and the plurality of reaction protrusions 116 makes it possible to better separate the molten iron and the upper slag. The combustion reaction of the dust removal ash and the slag includes the following steps:

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

[0066] S22. When the level of the molten iron exceeds the top of the reaction protrusion 116, the dust ash spraying assembly 2 is turned on again to spray the dust ash into the reaction chamber 111. The position of the blowing pipe 22 of the dust ash spraying assembly 2 is adjusted so that the injection point of the dust ash is directly opposite to the landing point of the slag entering the reaction chamber 111, so that the flow of the slag drives the dust ash to mix and flow and participate in the reaction. According to the flow rate of the slag, 50 kg of dust ash is sprayed for every ton of slag flowing into the reaction chamber 111 for cyclic spraying.

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

[0068] S31. Calculate the mass and liquid level of the molten iron in the reaction chamber 111 according to the mass of the dust and slag that have entered the reaction chamber 111.

[0069] S32. When the molten iron level 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 discharged molten iron amount reaches the calculated mass, the molten iron outlet 113 is blocked.

[0071] The calculation method is as follows:

[0072] The mass of molten iron generated in the reaction chamber 111 is preliminarily calculated based on the mass of the added dust ash and the mass of the slag that has entered the reaction chamber 111. For example, it is known that the iron content in the dust ash is 30% and the iron content in the slag is 1.2%. From the time when the slag flows into the reaction chamber 111 to the calculation time, the dust ash participating in the combustion reaction is 10 tons, and the slag flowing into the reaction chamber is 30 tons. The amount of molten iron expected to be generated after the reaction is: 10*30%+30*1.2%=3.36 tons.

[0073] The density of molten iron is 7 tons / m 3 Calculation shows that the bottom area of ​​the reaction chamber 111 is known, and the height H of the molten iron deposited in the reaction chamber 111 can be obtained. When H is close to the slag discharge port 114, the molten iron outlet 113 blocked by the water bubble mud is opened, and the generated molten iron is discharged into the ladle. When the discharge volume reaches 3.36 tons, the molten iron outlet 113 is blocked with water cannon mud.

[0074] When the liquid level of the slag in the reaction chamber 111 reaches the position of the slag discharge port 114, the high-temperature slag will automatically flow into the slag ditch 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 construction raw material for making cement.

[0075] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A slag reaction pool device, used to cause the dust and slag discharged from the blast furnace to undergo combustion reaction, characterized in that: The slag reaction pool device comprises: A reaction pool assembly (1), the reaction pool assembly (1) comprising a pool body (11) and a sealing cover (12), the pool body (11) having a reaction chamber (111), the sealing cover (12) being arranged above the pool body (11) to seal the reaction chamber (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 connected to the reaction chamber (111), the slag inlet (112) being connected to a slag outlet of the blast furnace, the molten iron outlet (113) being arranged at the bottom of the pool body (11), and the molten iron outlet (113) being selectively openable; A dust ash spraying assembly (2), the dust ash spraying assembly (2) being connected to the reaction chamber (111), and the dust ash spraying assembly (2) being configured to collect dust ash discharged from the blast furnace and spray it into the reaction chamber (111); an air supply component (3), the air supply component (3) being connected to the reaction chamber (111), the air supply component (3) comprising a fan (31), the fan (31) being configured to draw external air into the reaction chamber (111) so as to cause a combustion reaction between the dust removal ash and the slag; The molten iron produced by the combustion reaction is discharged through the molten iron outlet (113), and the recovered slag produced is discharged through the slag discharge port (114).

2. The slag reaction pool device according to claim 1, characterized in that: The bottom of the cell 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 cell body (11) toward the sealing cover (12); and the plurality of accommodating grooves (115) and the plurality of reaction protrusions (116) are arranged in sequence and at intervals.

3. The slag reaction pool device according to claim 2, characterized in that: The height of the slag discharge port (114) is greater than the top height of the reaction protrusion (116).

4. The slag reaction pool device according to any one of claims 1 to 3, characterized in that: The air supply assembly (3) further comprises an air suction duct (32), one end of the air suction duct (32) being connected to the reaction chamber (111), and the other end of the air suction duct (32) being connected to the blast furnace raw material preheating mechanism (100), and the air suction duct (32) being configured to guide the hot air flow generated by the combustion reaction to preheat the raw materials of the blast furnace.

5. The slag reaction pool device according to any one of claims 1 to 3, characterized in that: The air supply component (3) further comprises an air supply duct (33), the air supply duct (33) being connected to the fan (31), one end of the air supply duct (33) being connected to the reaction chamber (111), the air supply duct (33) being provided with a plurality of adjustment holes, the adjustment holes being connected to external air, and the adjustment holes being selectively openable; and / or, The air volume of the fan (31) is adjustable.

6. The slag reaction pool device according to any one of claims 1 to 3, characterized in that: The dust removal ash spraying assembly (2) further comprises a collection box (21) and a blowing pipe (22) connected to the collection box (21); the collection box (21) is used to contain the dust removal ash; one end of the blowing pipe (22) away from the collection box (21) extends into the reaction chamber (111); the blowing pipe (22) is a flexible and retractable hose; and an outlet of the blowing pipe (22) is arranged to be able to face any position of the cell body (11).

7. A method for comprehensive utilization of dust and slag, characterized in that: Using the slag reaction pool device according to any one of claims 1 to 9, the method for comprehensive utilization of dust ash and slag comprises: 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 sucked into the reaction chamber (111), the dust and slag undergo 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).

8. The method for comprehensive utilization of dust and slag according to claim 7, characterized in that: The step of introducing the dust and slag discharged from the blast furnace into the reaction chamber (111) of the slag reaction pool device and sucking external air into the reaction chamber (111) specifically comprises the following steps: S11, before the blast furnace is discharged from the slag, the dust removal ash spraying assembly (2) of the slag reaction pool device sprays the collected dust removal ash evenly on the bottom of the pool body (11); S12, turning on the fan (31) to draw external air into the reaction chamber (111), the dust removal ash starts to burn, and the fan (31) uses minimum power; S13, the blast furnace discharges the slag into the reaction chamber (111), and the power of the fan (31) is gradually increased.

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 sealing cover (12), the plurality of accommodating grooves (115) and the plurality of reaction protrusions (116) are arranged in sequence and spaced apart, and the height of the slag discharge port (114) is greater than the top height of the reaction protrusion (116); The combustion reaction between the dust removal ash and the slag comprises the following steps: S21, the dust removal ash and the slag undergo combustion reaction to generate molten iron, and the molten iron is deposited in the pool body (11); S22. When the liquid level of the molten iron exceeds the top of the reaction protrusion (116), the dust removal ash spraying assembly (2) of the slag reaction pool device is turned on again to spray the dust removal ash into the reaction chamber (111).

10. The method for comprehensive utilization of dust 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, comprising the following steps: S31, calculating the mass and liquid level of the molten iron in the reaction chamber (111) according to the mass of the dust and the slag that have entered the reaction chamber (111); S32, when the level of the molten iron approaches the height of the slag discharge port (114), opening the molten iron outlet (113) to discharge the molten iron; S33. When the amount of molten iron discharged reaches the calculated mass, the molten iron outlet (113) is blocked.

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