A method and device for directly preparing hot pressed briquettes from high temperature kiln slag

Abstract

The present invention provides a method and device for directly preparing hot briquettes from high-temperature kiln slag, the method comprising: step S1. the pressing plate moves toward the lower material port under the hydraulic pushing action of the plate pusher; step S2. when the pressing plate moves to the material dropping station, the kiln slag in the high-temperature kiln falls into the briquette hole on the pressing plate, the pressing plate moves to the slag blocking station, and the kiln slag is flattened; step S3. when the pressing plate moves to the slag pressing station, the slag pressing machine presses down to obtain hot briquettes; step S4. when the pressing plate moves to the demoulding station, the hot briquettes are demoulded from the pressing plate. The method and device of the present invention can quickly transform high-temperature sticky kiln slag into hot briquettes to realize resource utilization, and it has the advantages of simple process, high degree of equipment automation, low system investment and operating costs, etc.

Description

Technical Field

[0001] The invention relates to the field of metallurgical technology, and specifically to a method and device for treating high-temperature kiln slag generated in the process of treating zinc-containing and iron-containing dust and sludge in a steel enterprise. Background Art

[0002] In 2020, my country's steel production exceeded 1 billion tons. The amount of dust and mud generated in each process for every ton of steel smelting is about 100 kg. Among them, the annual generation of dust such as blast furnace ash and electric furnace ash exceeds 30 million tons, which is a typical bulk solid waste of steel enterprises. A large amount of dust and mud requires a reasonable resource treatment method to maximize the interests of the enterprise. At the same time, considering the small particle size of dust and mud particles, standardized disposal is required to ensure the production of the enterprise and the working environment of employees.

[0003] Dust sludge often contains 2% to 10% zinc and 20% to 40% iron, and contains a large amount of valuable metal elements such as zinc and iron, which has important resource recycling value. At the same time, dust sludge contains a large amount of harmful elements such as potassium, sodium, and chlorine. Direct reuse is not conducive to the smooth production of metallurgical kilns. Therefore, it cannot be directly returned to the smelting process and must be removed by appropriate processes.

[0004] The pyrometallurgical process is to use carbon-containing materials under high temperature conditions to reduce iron oxides and other substances in the dust and mud treatment, so as to realize the valuable utilization of the iron element, and also realize the fume separation of zinc, lead non-ferrous metal elements, K, and Na salt substances. At present, the main production processes used in actual production include rotary kilns and rotary hearth furnaces. Due to the advantages of low investment and low production cost, most of the domestic production of iron-containing dust and mud still adopts the rotary kiln process. At present, the traditional rotary kiln treatment process has problems such as kiln ring formation and poor environment for wet treatment of high-temperature kiln slag. In particular, high-temperature kiln slag cannot be directly reused in steel production. Water cooling, wet grinding and wet selection processes are often used to extract magnetic iron. The production site environment is extremely harsh, the resource utilization rate is low, and the environmental pollution is serious. Summary of the invention

[0005] To solve the above problems, the present invention provides a method and device for directly preparing hot pressed blocks from high temperature kiln slag. The method and device enable the high temperature kiln slag to be directly reused in steel production, with high resource utilization rate and no environmental pollution.

[0006] The above objectives are achieved through the following solutions:

[0007] A method for directly preparing hot pressed briquettes from high temperature kiln slag, characterized in that the method comprises:

[0008] Step S1. The briquetting plate moves gradually from one end of the briquetting machine to the feeding port at the other end inside the briquetting machine;

[0009] Step S2. When the briquetting plate moves from one end of the briquetting machine to the blanking station, the slag (2) in the high-temperature kiln falls into the briquetting hole on the briquetting plate, and then the briquetting plate moves to the slag blocking station, and the slag is flattened on the briquetting plate;

[0010] Step S3. When the briquetting plate moves from the slag blocking station to the slag pressing station, the slag pressing machine presses down, and the kiln slag (2) is formed in the briquetting hole to obtain a hot briquette;

[0011] Step S4. When the briquetting plate moves from the slag pressing station to the demoulding station, the hot briquetting is demoulded from the briquetting hole of the briquetting plate, and the hot briquetting falls into the slag pot through the discharge port, and is then transported to the steelmaking production via a trolley.

[0012] According to the above-mentioned method for directly preparing hot briquette from high-temperature kiln slag, it is characterized in that in step S1, the briquetting plate moves along the guide rail in the briquetting machine under the hydraulic pushing action of the plate pusher.

[0013] According to the above-mentioned method for directly preparing hot briquettes from high-temperature kiln slag, it is characterized in that in step S2, when the briquetting plate runs from one end of the briquetting machine to the release agent spraying station, the blowing machine sprays the release agent to the briquetting plate, and then the briquetting plate sprayed with the release agent runs to the blanking station.

[0014] The method for directly preparing hot briquettes from high-temperature kiln slag is characterized in that in step S2, the kiln slag continuously moves toward the kiln head as the high-temperature kiln rotates, and the kiln slag in the high-temperature kiln falls from the kiln head into the briquetting holes on the briquetting plate; a slag blocking machine is provided at the slag blocking station, and the slag blocking machine contacts the kiln slag on the briquetting plate through the bottom baffle plate and then flattens the kiln slag.

[0015] According to the method for directly preparing hot pressed briquettes from high-temperature kiln slag, it is characterized in that in step S4, a plate turning machine at the demoulding station lifts up the briquetting plate to flip the briquetting plate on the guide rail, and then a vibrating machine vibrates the bottom of the briquetting plate (5) to demould the hot pressed briquettes.

[0016] According to the above-mentioned method for directly preparing hot briquettes from high-temperature kiln slag, it is characterized in that in step S4, the briquetting plate that has escaped from the hot briquetting is pushed out from one end of the briquetting machine close to the discharge port under the hydraulic pushing action of the plate pushing machine, and then transported to the guide rail at the other end of the briquetting machine by a crane to continue the cyclic operation.

[0017] The method for directly preparing hot pressed briquettes from high temperature slag is characterized in that the temperature of the slag output from the high temperature kiln head is 400-1400°C; the temperature of the slag when it runs to the slag press is 400-1200°C.

[0018] The method for directly preparing hot pressed briquettes from high temperature kiln slag is characterized in that the entire processing cycle of the kiln slag (2) from being output from the high temperature kiln head to being made into hot pressed briquettes and falling into the slag pot is 5-30 minutes.

[0019] A device for directly preparing hot pressed briquettes from high-temperature kiln slag, used in the above-mentioned method for directly preparing hot pressed briquettes from high-temperature kiln slag, characterized in that the device comprises a high-temperature kiln and a briquetting machine, the briquetting machine is sequentially provided with a release agent spraying station, a blanking station, a slag blocking station, a slag pressing station, a demoulding station and a discharge port, the kiln head of the high-temperature kiln is arranged above the blanking station of the briquetting machine, the slag blocking station is provided with a slag blocking machine, and the slag pressing station is provided with a slag pressing machine.

[0020] The device for directly preparing hot pressed briquettes in the above-mentioned high-temperature kiln is characterized in that the device also includes a plate pusher arranged at one end of the briquetting machine close to the release agent spraying station, and the plate pusher pushes the briquetting plate to slide along the guide rail inside the briquetting machine; a plate flipper is provided below the demoulding station and a vibrating machine is provided above it.

[0021] Beneficial effects of the present invention:

[0022] Based on the problems that the semi-molten materials in the high-temperature kiln are easy to stick during the processing process and the high-temperature iron-containing materials are difficult to shape, the present invention invents a device and method for directly preparing hot briquetting with high-temperature kiln slag, and innovatively realizes the direct preparation of hot briquetting with high-temperature kiln slag, which is conducive to the full recycling of high-temperature kiln slag in the steel production process. The method and device of the present invention use a briquetting plate as a mold, a slag stopper as a kiln slag flattening device, a blower to prevent adhesion, a push plate machine as the main power device, and a plate flipper and a vibrator to efficiently demold the hot briquetting. The method and device of the present invention can achieve efficient homogenization of high-temperature kiln slag, quickly transform high-temperature sticky kiln slag into hot briquetting, provide good physical conditions for recycling steel production processes, and effectively meet the requirements of steel production recycling. The process of the present invention is simple, has the advantages of high degree of equipment automation, low system investment and operating costs. Compared with the rotary hearth furnace and vertical furnace production processes, the rotary kiln production process has outstanding cost advantages. By matching the dust and mud treatment process of steel enterprises with this process, it is expected to significantly improve the efficiency of resource utilization and significantly reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0024] Figure 1 A flow chart of a method for directly preparing hot pressed briquettes from high temperature kiln slag provided by the present invention;

[0025] Figure 2 A flow chart of another embodiment of the method of the present invention;

[0026] Figure 3 A schematic diagram of a device for directly preparing hot briquetting from high-temperature kiln slag provided by the present invention.

[0027] Figure 4 It is a schematic diagram of the structure of the briquetting plate from a top view.

[0028] Description of reference numerals:

[0029] High temperature kiln 1, kiln slag 2, kiln head 3, briquetting machine 4, briquetting plate 5, guide rail 6, briquetting hole 7, plate pusher 8, blowing machine 9, slag stopper 10, slag press 11, plate turning machine 12, vibrating machine 13, discharge port 14, hot briquetting 15, slag pot 16, trolley 17. Specific implementation methods

[0030] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] See also Figure 1-4 The present invention provides a method for directly preparing hot pressed briquettes from high temperature kiln slag, the method comprising the following steps:

[0033] Step S1. The briquetting plate 5 is moved inside the briquetting machine 4 from one end of the briquetting machine 4 to the unloading port (14) at the other end;

[0034] Step S2. When the briquetting plate 5 moves from one end of the briquetting machine 4 to the blanking station, the slag 2 in the high-temperature kiln 1 falls into the briquetting hole 7 on the briquetting plate 5, and then the briquetting plate 5 moves to the slag blocking station, and the slag is flattened on the briquetting plate 5;

[0035] Step S3. When the briquetting plate 5 moves from the slag blocking station to the slag pressing station, the slag pressing machine 11 presses down, and the kiln slag 2 is formed in the briquetting hole 7 to obtain the hot briquetting 15;

[0036] Step S4. When the briquetting plate 5 moves from the slag pressing station to the demoulding station, the hot briquetting 15 is demoulded from the briquetting hole 7 of the briquetting plate 5, and the hot briquetting 15 falls into the slag pot 16 through the discharge port 14, and is then transported to the steelmaking production via the trolley 17.

[0037] The method for directly preparing hot briquette from high-temperature kiln slag of the present invention comprises a plurality of briquetting plates, which are arranged in sequence on a track and move inside a briquetting machine, thereby improving production efficiency.

[0038] Among them, in step S1, the briquetting plate 5 moves along the guide rail in the briquetting machine 4 under the hydraulic pushing action of the push plate machine 8. In step S2, when the briquetting plate 5 runs from one end of the briquetting machine 4 to the release agent spraying station, the spraying machine 9 sprays the release agent to the briquetting plate 5 to prevent the hot briquetting from being difficult to demold, and then the briquetting plate 5 sprayed with the release agent runs to the blanking station. The release agent sprayed by the spraying machine 9 contains high melting point substances such as CaO and MgO, preferably calcium release agent, and the spraying operation pressure is not less than 0.1MPa. The slag 2 moves continuously toward the kiln head 3 as the high-temperature kiln 1 rotates, and the slag 2 in the high-temperature kiln 1 falls from the kiln head 3 into the briquetting hole 7 on the briquetting plate 5. The temperature of the slag 2 output from the kiln head 3 of the high-temperature kiln 1 is 400-1400℃, and the temperature of the slag 2 running to the slag press 11 is 400-1200℃. The slag blocking station is provided with a slag blocking machine 10, which contacts the slag 2 on the briquetting plate 5 through the bottom baffle plate to flatten the slag 2. The distance between the bottom baffle plate of the slag blocking machine 10 and the briquetting plate 5 is adjusted by hydraulic drive, and the distance is preferably 50-100 mm.

[0039] In step S3, the operating pressure of the slag pressing machine 11 when briquetting the high-temperature kiln slag 2 is not less than 10 MPa, and the maximum vibration frequency of the vibration machine 13 is not less than 60 Hz.

[0040] In step S4, the plate flipping machine 12 at the demoulding station lifts the briquetting plate 5 to flip the briquetting plate 5 on the guide rail, and then the vibrating machine 13 vibrates the bottom of the briquetting plate 5 to demould the hot pressed block 15. The hot pressed block 15 is a rectangular block structure with an aspect ratio of 1-3 and a minimum side length of not less than 3mm. After the hot pressed block 15 falls into the slag pot 16, it is protected by an inert gas, such as nitrogen, to prevent the hot pressed block 15 from oxidation.

[0041] The entire processing cycle from the kiln slag 2 being output from the kiln head 3 of the high-temperature kiln 1 to being made into hot pressed blocks 15 and falling into the slag pot 16 is 5-30 minutes.

[0042] In step S4, the briquetting plate 5 that has escaped from the hot briquetting 15 is pushed out from one end of the briquetting machine 4 close to the discharge port 14 under the hydraulic pushing action of the plate pusher 8, and then is transported to the guide rail (6) at the other end of the briquetting machine 4 by a crane to continue the cyclic operation.

[0043] The present invention also provides a device for directly preparing hot briquette from high-temperature kiln slag, which includes a high-temperature kiln 1 and a briquetting machine 4. The briquetting machine is provided with a release agent spraying station, a material-dropping station, a slag-blocking station, a slag-pressing station, a demoulding station and a material-dropping port 14 in sequence. The kiln head 3 of the high-temperature kiln 1 is arranged above the material-dropping station of the briquetting machine 4. The slag-blocking station is provided with a slag-blocking machine 10, and the slag-pressing station is provided with a slag-pressing machine 11. It also includes a plate pusher 8 arranged at one end of the briquetting machine 4 near the release agent spraying station, and the plate pusher 8 pushes the briquetting plate 5 to slide along the inner guide rail 6 of the briquetting machine; a plate flipper 12 is provided below the demoulding station, and a vibrating machine 13 is provided above it.

[0044] The high temperature kiln 1 of the present invention is a high temperature kiln, and the kiln production smelting temperature is 400-1600℃. Refractory materials are arranged in the high temperature kiln 1, and the thickness of the refractory materials is 80-300mm. The main body of the briquetting machine 4 is made of steel structure material, and the outer cover of the briquetting machine 4 is installed with insulation material, and the thickness of the insulation material is 50-100mm; the interior of the briquetting machine 4 is sprayed with high temperature resistant spray coating, and the thickness of the spray coating is 10-50mm. The briquetting plate 5 of the present invention is a rectangular cast steel or cast iron structure mold, and the side length of the briquetting plate 5 is 1-4m, the thickness is 100-500mm, and the briquetting holes 7 are evenly distributed on the briquetting plate 5. The briquetting plate 5 moves on the guide rail 6 under the push of the push plate machine 8. The guide rail 6 is a wear-resistant steel structure track, and the push plate machine 8 adopts a hydraulic drive method to provide power for the movement of the briquetting plate 5. The spraying machine 9 is a pressure powder spraying device. The spraying machine 9 sprays the release agent toward the briquetting plate 5 driven by compressed air. The pressure of the compressed air used is not less than 0.2MPa.

[0045] The slag stopper 10 is a high temperature resistant steel structure baffle with a thickness of 30-200mm; the distance between the slag stopper 10 and the upper surface of the briquetting plate 5 is adjustable at 30-200mm. The main body of the slag press 11 is a high temperature resistant steel structure. The bottom pressure plate of the slag press 11 and the briquetting plate 5 are of the same size. The slag press 11 works hydraulically. The plate flipper 12 lifts the briquetting plate 5 from the bottom of the briquetting plate 5 and can flip the briquetting plate 5 by 180°. Both the plate flipper 12 and the vibrating machine 13 are hydraulically operated.

[0046] The discharge port 14 is in the form of an inverted trumpet of a steel structure, the upper diameter of the discharge port 14 is larger than the size of the briquetting plate 5 , and the bottom outlet size is smaller than the upper diameter of the slag pot 16 .

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0048] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for directly preparing hot pressed briquettes from high temperature kiln slag, characterized in that: The method comprises: Step S1. The briquetting plate (5) is moved inside the briquetting machine (4) from one end of the briquetting machine (4) to the unloading port (14) at the other end; Step S2. When the briquetting plate (5) moves from one end of the briquetting machine (4) to the material dropping station, the slag (2) in the high-temperature kiln (1) falls into the briquetting hole (7) on the briquetting plate (5), and then the briquetting plate (5) moves to the slag blocking station, and the slag is flattened on the briquetting plate (5); Step S3. When the briquetting plate (5) moves from the slag blocking station to the slag pressing station, the slag pressing machine (11) presses down. The kiln slag (2) is formed in the briquetting hole (7) to obtain a hot briquette (15); Step S4. When the briquetting plate (5) moves from the slag pressing station to the demoulding station, the hot briquetting (15) is demoulded from the briquetting hole (7) of the briquetting plate (5), and the hot briquetting (15) falls into the slag pot (16) through the discharge port (14), and is then transported to the steelmaking production via the trolley (17).

2. The method for directly preparing hot briquettes from high temperature kiln slag according to claim 1, characterized in that: In step S1, the briquetting plate (5) moves along the guide rail inside the briquetting machine (4) under the hydraulic pushing action of the plate pusher (8).

3. The method for directly preparing hot briquettes from high temperature kiln slag according to claim 1, characterized in that: In step S2, when the briquetting plate (5) moves from one end of the briquetting machine (4) to the release agent spraying station, the spraying machine (9) sprays the release agent to the briquetting plate (5), and then the briquetting plate (5) sprayed with the release agent moves to the blanking station.

4. The method for directly preparing hot briquettes from high temperature kiln slag according to claim 3, characterized in that: In step S2, the slag (2) continuously moves toward the kiln head (3) as the high-temperature kiln (1) rotates, and the slag (2) in the high-temperature kiln (1) falls from the kiln head (3) into the briquetting hole (7) on the briquetting plate (5); the slag blocking station is provided with a slag blocking machine (10), and the slag blocking machine (10) contacts the slag (2) on the briquetting plate (5) through the bottom baffle plate and then flattens the slag (2).

5. The method for directly preparing hot briquettes from high temperature kiln slag according to claim 1, characterized in that: In step S4, the plate turning machine (12) at the demoulding station lifts up the briquetting plate (5) to turn the briquetting plate (5) over on the guide rail, and then the vibrating machine (13) vibrates the bottom of the briquetting plate (5) to demould the hot briquetting (15).

6. The method for directly preparing hot briquettes from high temperature kiln slag according to claim 5, characterized in that: In step S4, the briquetting plate (5) that has been released from the hot briquetting (15) is pushed out from one end of the briquetting machine (4) close to the discharge port (14) by the hydraulic pushing action of the plate pusher (8), and then transported to the guide rail (6) at the other end of the briquetting machine (4) by a crane to continue the cyclic operation.

7. The method for directly preparing hot briquettes from high temperature kiln slag according to claim 4, characterized in that: The temperature of the slag (2) output from the kiln head (3) of the high-temperature kiln (1) is 400-1400°C; the temperature of the slag (2) when it reaches the slag press (11) is 400-1200°C.

8. The method for directly preparing hot briquettes from high temperature kiln slag according to claim 4, characterized in that: The entire processing cycle from the kiln slag (2) being output from the kiln head (3) of the high-temperature kiln (1) to being made into hot pressed blocks (15) and falling into the slag pot (16) is 5-30 minutes.

9. A device for directly preparing hot briquettes from high-temperature kiln slag, used in the method for directly preparing hot briquettes from high-temperature kiln slag as claimed in any one of claims 1 to 8, characterized in that: The device comprises a high-temperature kiln (1) and a briquetting machine (4), wherein the briquetting machine is provided with a demoulding agent spraying station, a material dropping station, a slag blocking station, a slag pressing station, a demoulding station and a material discharge port (14) in sequence, a kiln head (3) of the high-temperature kiln (1) is arranged above the material dropping station of the briquetting machine (4), the slag blocking station is provided with a slag blocking machine (10), and the slag pressing station is provided with a slag pressing machine (11).

10. The device for directly preparing hot briquettes from high temperature kiln slag according to claim 9, characterized in that: The device also includes a plate pusher (8) arranged at one end of the briquetting machine (4) close to the demoulding agent spraying station, and the plate pusher (8) pushes the briquetting plate (5) to slide along the guide rail (6) inside the briquetting machine; a plate flipper (12) is provided below the demoulding station and a vibrating machine (13) is provided above it.

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