A steel slag leaching reactor and method of use thereof

Abstract

The application provides a steel slag leaching reactor and a use method thereof, and the reactor comprises: an ammonium salt solution storage tank and a leaching reactor arranged from top to bottom; the ammonium salt solution storage tank and the leaching reactor are connected through a gas buffer tank; a plurality of water sprayers connected with the ammonium salt solution storage tank are arranged in the leaching reactor; a temperature measuring port and a pH detection port are arranged on the leaching reactor, and a rotary disc stirrer is arranged in the leaching reactor. In the leaching reaction process of the steel slag leaching reactor, the generated gas can be returned to the ammonium salt solution storage tank, the material can be recycled and utilized, and the cost is reduced; moreover, the material is fully stirred through the rotary disc stirrer, the multiple water sprayers are jointly used, the enrichment of the material in the corner is avoided, the material is beneficial to fully react, and the slag phase can also be avoided to be left after the reaction is completed; in addition, the temperature and pH parameters in the reactor can be monitored in the leaching process, and the stable leaching efficiency is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of reactors, in particular to a steel slag leaching reactor and a method for using the same. BACKGROUND

[0002] The steel industry is an important pillar of modern industry and plays a key role in the development of the national economy. With the continuous growth of steel production, the amount of steel slag discharged is also increasing. Steel slag is an inevitable byproduct of the steel smelting process, with a huge output and fast accumulation. The piling up of a large amount of steel slag not only occupies valuable land resources, but also may cause serious pollution to ecological environmental elements such as soil and groundwater due to the leaching of harmful substances such as heavy metals contained therein.

[0003] Steel slag contains a variety of valuable components, such as iron, silicon, calcium, magnesium, and other elements. Recycling and utilizing these valuable components have significant economic value. Currently, ammonium salt leaching of steel slag is a new and potential process. Ammonium salt has unique chemical properties, which can react with certain components in steel slag during leaching, allowing valuable metal ions and other substances to enter the solution, thereby achieving the separation and recovery of valuable components in steel slag. This process has advantages over traditional leaching processes in the extraction of specific valuable components, such as better selectivity in extracting calcium, magnesium, and other elements.

[0004] Traditional reactors have many problems when applied to the ammonium salt leaching of steel slag process. First, the ammonium salt leaching process is sensitive to reaction temperature, solution pH, and other parameters. Traditional reactors are difficult to accurately control these parameters, resulting in unstable leaching efficiency. Second, complex reaction phenomena such as gas production may occur during the ammonium salt leaching process, and the sealing and internal flow field design of traditional reactors cannot be well adapted, easily causing material loss and incomplete reaction. In addition, steel slag particles vary in size, and the stirring method of traditional reactors cannot ensure sufficient contact between steel slag and ammonium salt solution, resulting in dead angles in the leaching process and reducing the leaching rate. Furthermore, complete transfer and cleaning of the materials in the reactor after the completion of the leaching reaction is also a major problem.

[0005] In view of the above, the present application is proposed. SUMMARY

[0006] The purpose of the present application is to provide a steel slag leaching reactor and a method for using the same, which can solve the problems that traditional reactors cannot monitor temperature, pH, and other parameters, cannot recover and utilize the gas produced during the leaching process, and the material accumulates in the corners during the leaching process.

[0007] The first aspect of the present application provides a steel slag leaching reactor, comprising: an ammonium salt solution storage tank and a leaching reactor arranged from top to bottom; the ammonium salt solution storage tank is connected with the leaching reactor through a gas buffer tank; the leaching reactor is provided with a plurality of water sprayers connected with the ammonium salt solution storage tank; the leaching reactor is provided with a temperature measuring port and a pH detection port, and the leaching reactor is provided with a rotary disc stirrer.

[0008] Preferably, the gas buffer tank is arranged at the top of the leaching reactor, and the gas buffer tank is connected to the gas outlet at the top of the leaching reactor through a steam pipeline.

[0009] Preferably, a spring valve is installed at the gas outlet at the top of the leaching reactor.

[0010] Specifically, the spring valve can have various forms, and in a specific embodiment, the spring valve comprises a conical plug, an elastic member and a matching member; the matching member has a hollow cavity, the matching member is wider than the top of the conical plug, and the elastic member is connected with the top of the conical plug and the matching member.

[0011] Preferably, the top of the leaching reactor is provided with a plurality of water sprayers directly connected with the ammonium salt solution storage tank; and the side of the leaching reactor is provided with a plurality of water sprayers connected with the ammonium salt solution storage tank through a solution conveying pipeline.

[0012] Preferably, the ammonium salt solution storage tank is provided with a stirrer.

[0013] Preferably, the top of the ammonium salt solution storage tank is provided with a first feeding port, and the first feeding port is provided with a first feeding cover.

[0014] Preferably, the rotary disc stirrer comprises a plurality of cross-arranged stirring rods, a rotary motor is arranged at the center of each stirring rod, and a filter screen is arranged above or below the stirring rod.

[0015] Preferably, the rotary disc stirrer comprises an upper rotary disc stirrer and a lower rotary disc stirrer, and a heating rod is arranged between the upper rotary disc stirrer and the lower rotary disc stirrer.

[0016] Preferably, the heating rod comprises a plurality of connected heating pipes, and positive and negative electrodes extending to the outer wall of the leaching reactor are arranged at both ends of the heating pipes.

[0017] Preferably, the side wall of the leaching reactor is provided with a second feeding port, the second feeding port is provided with a second feeding cover, and the bottom of the leaching reactor is provided with a discharging port.

[0018] Preferably, the ammonium salt comprises one or more of ammonium chloride, ammonium sulfate, ammonium bisulfate, ammonium acetate, ammonium nitrate, ammonium phosphate and ammonium carbonate.

[0019] In a second aspect of the present application, a method for using the steel slag leaching reactor is provided, comprising the following steps:

[0020] An ammonium salt solution is prepared by adding ammonium salt and water into an ammonium salt solution storage tank, and the leaching solution is provided for the leaching reactor below;

[0021] Steel slag is added into the leaching reactor, and the leaching solution is sprayed into the leaching reactor through a plurality of water sprayers, and the material is stirred by a rotating disc stirrer;

[0022] The gas generated in the leaching reactor enters a gas buffer tank and is then discharged into the ammonium salt solution storage tank, and part of the gas is absorbed by the solution and part of the gas is discharged from the ammonium salt solution storage tank;

[0023] During the leaching reaction, the reaction temperature and pH value in the leaching reactor are monitored through a temperature measuring port and a pH detection port;

[0024] After the leaching reaction is completed, the material is discharged from the leaching reactor, and the water sprayers are opened for spraying and flushing to clean the residual material in the leaching reactor.

[0025] The present application has at least the following beneficial effects:

[0026] (1) In the leaching reaction process of the steel slag leaching reactor of the present application, the generated gas can be returned to the ammonium salt solution storage tank, realizing the recycling of the material and reducing the cost, and the solution backflow phenomenon can also be avoided through the gas buffer tank.

[0027] (2) In the present application, the material is fully stirred by the rotating disc stirrer, and the combined action of the plurality of water sprayers is used, avoiding the enrichment of the material in a corner, which is beneficial to the full reaction of the material, and also avoiding the residue of the slag phase after the reaction is completed.

[0028] (3) In the present application, the temperature and pH and other parameters in the leaching reactor can be monitored through the temperature measuring port and the pH detection port during the leaching process, ensuring the stable leaching efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the following specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0030] Figure 1 The structure diagram of the steel slag leaching reactor provided by the present application is shown.

[0031] Figure 2 Structure diagram of spring valve provided by the present application.

[0032] Figure 3 Structure diagram of water sprayer provided by the present application.

[0033] Figure 4 Structure diagram of rotary disc stirrer provided by the present application.

[0034] Figure 5 Structure diagram of heating rod provided by the present application.

[0035] BRIEF DESCRIPTION OF DRAWINGS 1, ammonium salt solution storage tank; 11, first motor; 12, stirrer; 13, first feeding cover; 14, first feeding port; 15, steam pipeline; 16, spring valve; 161, conical plug; 162, elastic member; 163, matching part; 17, first ammonium salt solution conveying pipeline; 18, second ammonium salt solution conveying pipeline; 19, gas buffer tank; 2, leaching reactor; 21, temperature measuring port; 22, pH detection port; 23, second feeding cover; 24, second feeding port; 25, water sprayer; 251, second motor; 252, three-port spray head; 26, upper rotary disc stirrer; 261, first stirring rod; 262, second stirring rod; 263, third stirring rod; 264, rotary motor; 265, filter screen; 27, lower rotary disc stirrer; 28, heating rod; 281, positive electrode; 282, negative electrode; 283, heating tube; 29, discharge port. DETAILED DESCRIPTION

[0036] The technical solutions of the present application will be described below in conjunction with the embodiments, 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.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 a limitation of the present application.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] Example

[0040] like Figure 1 As shown, this embodiment provides a steel slag leaching reactor, including: an ammonium salt solution storage tank 1 and a leaching reactor 2 arranged from top to bottom; the ammonium salt solution storage tank 1 and the leaching reactor 2 are connected by a gas buffer tank 19, and the gas generated in the leaching reactor 2 can be returned to the ammonium salt solution storage tank 1, realizing the recycling of materials and reducing costs. The gas buffer tank 19 can prevent the backflow of solution; the leaching reactor 2 is equipped with several water sprayers 25 connected to the ammonium salt solution storage tank 1; the leaching reactor 2 is equipped with a temperature measuring port 21 and a pH measuring port 22, which can monitor the temperature and pH parameters in the leaching reactor during the leaching process to ensure stable leaching efficiency; the lower middle part of the leaching reactor 2 is equipped with a rotary agitator, which fully stirs the material, and the combined action of multiple water sprayers 25 avoids the accumulation of material in a certain corner, which is conducive to the full reaction of the material, and also avoids slag residue after the reaction is completed.

[0041] In this embodiment, the gas buffer tank 19 is located on the top right side of the leaching reactor 2. The gas buffer tank 19 is connected to the gas outlet at the top of the leaching reactor 2 via a steam pipe 15. The bottom of the gas buffer tank 19 is connected to a pipe that leads into the ammonium salt solution storage tank 1 and is submerged in the upper layer of the solution.

[0042] In this embodiment, a spring valve 16 is installed at the air outlet at the top of the leaching reactor 2, and the steam pipe 15 is connected to the leaching reactor 2 through the spring valve 16.

[0043] like Figure 2 As shown, the spring valve 16 includes: a conical plug 161, an elastic element 162, and a fitting 163; the fitting 163 has a hollow cavity, and the fitting 163 is slightly wider than the top of the conical plug 161; the elastic element 162 is connected to the top of the conical plug 161 and the fitting 163.

[0044] In the embodiment, eight water sprayers 25 are arranged on the inner wall of the top of the leaching reactor 2 and connected directly with the ammonium salt solution tank 1; twelve water sprayers 25 are arranged on the inner wall of the side of the leaching reactor 2 and connected with the ammonium salt solution tank 1 through four pipes including the first solution conveying pipe 17 and the second solution conveying pipe 18.

[0045] In the embodiment, the ammonium salt solution tank 1 is provided with a stirrer 12 driven by the first motor 11 at the top for stirring.

[0046] In the embodiment, the left side of the top of the ammonium salt solution tank 1 is provided with a first feeding port 14 for feeding solid and liquid, and the first feeding port 14 is provided with a first feeding cover 13.

[0047] As shown in Figure 3 , the water sprayer 25 includes a second motor 251 and a three-port sprayer 252, the second motor 251 is used for water absorption and pressure storage, and the three-port sprayer 252 is connected with the bottom of the second motor 251 to realize water spraying.

[0048] In the embodiment, the rotary disc stirrer includes an upper rotary disc stirrer 26 and a lower rotary disc stirrer 27, and three same heating rods 28 are transversely arranged and connected between the upper rotary disc stirrer 26 and the lower rotary disc stirrer 27.

[0049] As shown in Figure 4 , the bottom of the upper rotary disc stirrer 26 is a filter screen 265, and a first stirring rod 261, a second stirring rod 262 and a third stirring rod 263 are arranged above the filter screen 265 in a cross manner, a rotating motor 264 is arranged at the center of the vertically crossed stirring rods, the rotating motor 264 is powered through electrodes on both sides of the heating rod 28 to drive the rapid rotation of the stirring rods. The top of the lower rotary disc stirrer 27 is a filter screen, and a fourth stirring rod, a fifth stirring rod and a sixth stirring rod are arranged below the filter screen in a cross manner.

[0050] As shown in Figure 5 , the heating rod 28 includes a plurality of connected heating pipes 283, positive electrodes 281 and negative electrodes 282 are arranged at both ends of the heating pipes 283 and extend to the outer wall of the leaching reactor 2, which are used for power supply of the rotary disc stirrer and the heating pipes, and at the same time, temperature control is realized at the upper temperature measuring port 21.

[0051] In the embodiment, the side wall of the leaching reactor 2 is provided with a second feeding port 24, and the second feeding port 24 is provided with a second feeding cover 23; the bottom of the leaching reactor 2 is provided with a discharging port 29, and the material to be reacted is discharged from the discharging port 29 after the reaction is completed.

[0052] In the embodiment, the ammonium salt is ammonium chloride.

[0053] The embodiment also provides a method for using the steel slag leaching reactor, comprising the following steps:

[0054] The ammonium salt solution storage tank 1 adds ammonium salt and water through the first feeding port 14 at the top in a fixed ratio to prepare an ammonium salt solution, and the first motor 11 controls the stirrer 12 to stir and dissolve the solution, so as to provide a leaching liquid for the leaching reaction of the steel slag below;

[0055] The steel slag is fed into the leaching reactor 2 through the second feeding port 24, the ammonium salt solution storage tank 1 can spray the leaching liquid into the leaching reactor 2 through the plurality of water sprayers 25, the second feeding cover 23 is closed after the feeding is completed, clean water is added into the ammonium salt solution, the positive electrode 281 and the negative electrode 282 are connected, and heating and stirring are started; at this time, the three stirring rods in the upper disc stirrer 26 and the lower disc stirrer 27 start to rotate rapidly, so as to avoid the enrichment of the raw materials in the corners;

[0056] When the temperature rises to a certain degree, the gas generated in the leaching reactor 2 is discharged from the spring valve 16, the conical plug 161 in the spring valve 16 is compressed upward due to the pressure, the gas is discharged from the matching part 163 to the ammonium salt solution storage tank 1, the ammonia gas easily soluble in water is absorbed, and excessive gas is discharged from the first feeding port 14, so that the spring valve 16 realizes the automatic exhaust function, and the gas buffer tank 19 can prevent the liquid from being sucked back;

[0057] During the leaching reaction process, the temperature measuring port 21 and the pH detection port 22 are used to strictly monitor the leaching reaction process, so as to ensure the stable leaching efficiency;

[0058] After the leaching reaction is completed, the material flows out from the discharge port 29 at the bottom of the leaching reactor 2, at this time, the water sprayers 25 can be opened to spray and flush, and the power supply is turned off after the material is completely transferred.

[0059] In summary, in the leaching reaction process of the steel slag leaching reactor, the generated gas can be returned to the ammonium salt solution storage tank, the material recycling is realized, the cost is reduced, and the solution backflow phenomenon can be avoided through the gas buffer tank; the material is fully stirred through the disc stirrer, the multiple water sprayers are used together, the enrichment of the material in a corner is avoided, the material fully reacts, the slag phase residue can be avoided after the reaction is completed, the temperature and pH parameters in the leaching reactor can be monitored through the temperature measuring port and the pH detection port during the leaching process, and the stable leaching efficiency is ensured.

[0060] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A steel slag leaching reactor characterized by, The application relates to a leaching reactor for leaching steel slag. The ammonium salt solution storage tank (1) is connected with the leaching reactor (2) through a gas buffer tank (19); a plurality of water sprayers (25) are arranged in the leaching reactor (2) and connected with the ammonium salt solution storage tank (1); a temperature measuring port (21) and a pH detecting port (22) are arranged on the leaching reactor (2); a rotary disc stirrer is arranged in the leaching reactor (2); the gas buffer tank (19) is arranged on the top of the leaching reactor (2) and connected with a gas outlet on the top of the leaching reactor (2) through a steam pipeline (15); a spring valve (16) is arranged on the gas outlet on the top of the leaching reactor (2); a plurality of water sprayers (25) are arranged on the top of the leaching reactor (2) and directly connected with the ammonium salt solution storage tank (1); a stirrer (12) is arranged in the ammonium salt solution storage tank (1); a plurality of water sprayers (25) are arranged on the side of the leaching reactor (2) and connected with the ammonium salt solution storage tank (1) through a solution conveying pipeline; the rotary disc stirrer comprises an upper rotary disc stirrer (26) and a lower rotary disc stirrer (27); a heating rod (28) is arranged between the upper rotary disc stirrer (26) and the lower rotary disc stirrer (27). A first feeding port (14) is arranged on the top of the ammonium salt solution storage tank (1) and provided with a first feeding cover (13).

2. The steel slag leaching reactor according to claim 1, characterized in that, The heating rod (28) comprises a plurality of connected heating pipes (283), and positive electrodes (281) and negative electrodes (282) are arranged at two ends of the heating pipes (283) and extend to the outer wall of the leaching reactor (2).

3. The steel slag leaching reactor according to claim 1, characterized in that, A second feeding port (24) is arranged on the side wall of the leaching reactor (2) and provided with a second feeding cover (23); and a discharging port (29) is arranged on the bottom of the leaching reactor (2).

4. The steel slag leaching reactor according to claim 1, characterized in that, The application further discloses a leaching method.

5. The method of using a steel slag leaching reactor according to any one of claims 1 to 4, characterized in that, Ammonium salt and water are added into the ammonium salt solution storage tank (1) to prepare ammonium salt solution, so as to provide leaching liquid for the leaching reactor (2) below; Steel slag is added into the leaching reactor (2), and the leaching liquid is sprayed into the leaching reactor (2) through a plurality of water sprayers (25), and a rotary disc stirrer is used to stir the material; The gas generated in the leaching reactor (2) enters the gas buffer tank (19) and is then discharged into the ammonium salt solution storage tank (1), part of the gas is absorbed by the solution, and part of the gas is discharged from the ammonium salt solution storage tank (1); During the leaching reaction, the reaction temperature and the pH value in the leaching reactor (2) are monitored through the temperature measuring port (21) and the pH detecting port (22); After the leaching reaction is completed, the material is discharged from the leaching reactor (2), the water sprayers (25) are opened to spray and flush, and the residual material in the leaching reactor (2) is cleaned. ​

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