Steel slag leaching reactor and use method thereof

Abstract

The invention provides a steel slag leaching reactor and a use method thereof. The reactor comprises an ammonium salt solution storage tank and a leaching reactor which are arranged from top to bottom, the ammonium salt solution storage tank is connected with the leaching reactor through a gas buffer tank; a plurality of water sprayers connected with an ammonium salt solution storage tank are arranged in the leaching reactor; a temperature measuring opening and a pH detection opening are formed in the leaching reactor, and a turntable stirrer is arranged in the leaching reactor. According to the steel slag leaching reactor, in the leaching reaction process, generated gas can return to the ammonium salt solution storage tank, recycling of materials is achieved, and the cost is reduced; the materials are fully stirred through the rotating disc stirrer, and the materials are prevented from being enriched at corners under the combined action of a plurality of water sprayers, so that the materials can fully react, and slag phase residues can be avoided after the reaction is completed; in addition, parameters such as temperature and pH in the reactor can be monitored in the leaching process, and stable leaching efficiency is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of reactors, and in particular to a slag leaching reactor and a use method thereof. Background Art

[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 emission of steel slag is also increasing. Steel slag is an inevitable product of the steel smelting process, with huge output and fast accumulation. The accumulation of large amounts of steel slag not only occupies precious land resources, but also may cause serious pollution to ecological environment elements such as soil and groundwater due to the seepage of harmful substances such as heavy metals contained in it.

[0003] Steel slag contains a variety of valuable components, such as iron, silicon, calcium, magnesium and other elements. The recycling of these valuable components has significant economic value. At present, ammonium salt leaching of steel slag is an emerging and promising process. Ammonium salt has unique chemical properties. When leaching steel slag, it can react with certain components in the steel slag, allowing valuable metal ions and other substances to enter the solution, thereby achieving the separation and recovery of valuable components in the steel slag. Compared with traditional leaching processes, this process shows advantages in the extraction of specific valuable components, such as good selectivity in the extraction of elements such as calcium and magnesium.

[0004] There are many problems when traditional reactors are used in the process of ammonium salt leaching of steel slag. First, the ammonium salt leaching process is sensitive to parameters such as reaction temperature and solution pH. It is difficult for traditional reactors to accurately control these parameters, resulting in unstable leaching efficiency. Secondly, complex reaction phenomena such as gas may be produced during the ammonium salt leaching process. The sealing and internal flow field design of traditional reactors cannot adapt well, which can easily cause material loss and incomplete reaction. In addition, the steel slag particles are of different sizes, and the stirring method of the traditional reactor cannot ensure sufficient contact between the steel slag and the ammonium salt solution, resulting in dead corners in the leaching process and reducing the leaching rate. Furthermore, after the leaching reaction is completed, the complete transfer and cleaning of the materials in the reactor is also a major problem.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The object of the present invention 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 parameters such as temperature and pH, it is difficult to recycle the gas generated during the leaching process, and the material is enriched in corners during the leaching process.

[0007] The first aspect of the present invention 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 and the leaching reactor are connected via a gas buffer tank; a plurality of water sprinklers connected to 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 disk agitator is arranged in the leaching reactor.

[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 pipe.

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

[0010] Specifically, the spring valve can be in various forms. In a specific embodiment, the spring valve includes: 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 to the conical plug and the top of the matching member.

[0011] Preferably, a plurality of sprinklers directly connected to the ammonium salt solution storage tank are arranged on the top of the leaching reactor; and a plurality of sprinklers connected to the ammonium salt solution storage tank through a solution delivery pipeline are arranged on the side of the leaching reactor.

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

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

[0014] Preferably, the turntable agitator comprises: a plurality of cross-arranged stirring rods, a plurality of stirring rods are provided with rotating motors at the centers thereof, and a filter is provided above or below the stirring rods.

[0015] Preferably, the turntable agitator comprises: an upper turntable agitator and a lower turntable agitator; a heating rod is provided between the upper turntable agitator and the lower turntable agitator.

[0016] Preferably, the heating rod comprises: a plurality of connected heating tubes, at both ends of which are provided a positive electrode and a negative electrode extending to the outer wall of the leaching reactor.

[0017] Preferably, a second feed inlet is provided on the side wall of the leaching reactor, and a second feed cover is provided on the second feed inlet; and a discharge port is provided at the bottom of the leaching reactor.

[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] A second aspect of the present invention provides a method for using a slag leaching reactor, comprising the following steps:

[0020] Adding ammonium salt and water into the ammonium salt solution storage tank to prepare an ammonium salt solution, which provides leaching liquid for the leaching reactor below;

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

[0022] The gas generated in the leaching reactor enters the gas buffer tank and then is discharged into the ammonium salt solution storage tank, 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 the temperature measuring port and the pH detection port;

[0024] After the leaching reaction is completed, the material is discharged from the leaching reactor, and the sprinkler is turned on for spray flushing to clean the residual material in the leaching reactor.

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

[0026] (1) During the leaching reaction process of the steel slag leaching reactor of the present invention, the gas generated can be returned to the ammonium salt solution storage tank, thereby realizing the recycling of materials and reducing costs. The gas buffer tank can also avoid the solution back-absorption phenomenon.

[0027] (2) The present invention fully stirs the material by a rotary disk agitator and then uses the combined effect of multiple water sprinklers to avoid the enrichment of the material in a certain corner, which is conducive to the full reaction of the material and can also avoid the residue phase from remaining after the reaction is completed.

[0028] (3) During the leaching process, the present invention can monitor the temperature and pH parameters in the leaching reactor through the temperature measuring port and the pH detection port to ensure stable leaching efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 This is a schematic structural diagram of the steel slag leaching reactor provided by the present invention.

[0031] Figure 2 This is a schematic structural diagram of the spring valve provided by the present invention.

[0032] Figure 3 A schematic structural diagram of a sprinkler provided by the present invention.

[0033] Figure 4 This is a schematic structural diagram of the turntable agitator provided by the present invention.

[0034] Figure 5 This is a schematic structural diagram of the heating rod provided by the present invention.

[0035] Description of reference numerals: 1. ammonium salt solution storage tank; 11. first motor; 12. agitator; 13. first feeding cover; 14. first feeding port; 15. steam pipe; 16. spring valve; 161. conical plug; 162. elastic member; 163. matching member; 17. first ammonium salt solution delivery pipeline, 18. second ammonium salt solution delivery 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-nozzle nozzle; 26. Upper turntable agitator; 261. First stirring rod; 262. Second stirring rod; 263. Third stirring rod; 264. Rotating motor; 265. Filter; 27. Lower turntable agitator; 28. Heating rod; 281. Positive electrode; 282. Negative electrode; 283. Heating tube; 29. ​​Discharge port. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than 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.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships 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, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0038] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, 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 connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Example

[0040] like Figure 1 As shown, this embodiment provides a steel slag leaching reactor, comprising: 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 through 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, so that the material is recycled and the cost is reduced. The solution back-absorption phenomenon can be avoided by the gas buffer tank 19; a plurality of sprinklers 25 connected to the ammonium salt solution storage tank 1 are arranged in the leaching reactor 2; a temperature measuring port 21 and a pH detection port 22 are provided on the leaching reactor 2, and the temperature and pH and other parameters in the leaching reactor can be monitored during the leaching process to ensure stable leaching efficiency; a turntable agitator is provided in the middle and lower part of the leaching reactor 2, and the material is fully stirred by the turntable agitator, and then the joint action of multiple sprinklers 25 is adopted to avoid the enrichment of the material in a certain corner, which is conducive to the full reaction of the material, and the slag phase can also be avoided after the reaction is completed.

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

[0042] In this embodiment, a spring valve 16 is installed at the gas outlet on 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 member 162 and a matching member 163; the matching member 163 has a hollow cavity, the matching member 163 is wider than the top of the conical plug 161, and the elastic member 162 is connected to the conical plug 161 and the top of the matching member 163.

[0044] In this embodiment, eight sprinklers 25 are provided on the top inner wall of the leaching reactor 2 and are directly connected to the ammonium salt solution storage tank 1; twelve sprinklers 25 are provided on the side inner wall of the leaching reactor 2 and are connected to the ammonium salt solution storage tank 1 through four pipelines, namely the first solution delivery pipeline 17 and the second solution delivery pipeline 18.

[0045] In this embodiment, an agitator 12 is provided in the ammonium salt solution storage tank 1 , and the agitator 12 is driven by a top first motor 11 to stir.

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

[0047] like Figure 3 As shown, the sprinkler 25 includes a second motor 251 and a three-port nozzle 252. The second motor 251 is used to absorb water and store pressure. The three-port nozzle 252 is connected to the bottom of the second motor 251 to realize water spraying.

[0048] In this embodiment, the turntable agitator includes: an upper turntable agitator 26 and a lower turntable agitator 27; three identical heating rods 28 are horizontally arranged and connected between the upper turntable agitator 26 and the lower turntable agitator 27.

[0049] like Figure 4 As shown, the bottom of the upper turntable stirrer 26 is a filter screen 265, and the first stirring rod 261, the second stirring rod 262 and the third stirring rod 263 are crossed above the filter screen 265. A rotating motor 264 is arranged at the center of the vertically crossed stirring rods. The rotating motor 264 is powered by electrodes on both sides of the heating rod 28, thereby driving the stirring rods to rotate rapidly. The top of the lower turntable stirrer 27 is a filter screen, and the fourth stirring rod, the fifth stirring rod and the sixth stirring rod are crossed below the filter screen.

[0050] like Figure 5 As shown, the heating rod 28 includes: a plurality of connected heating tubes 283, at both ends of which are provided a positive electrode 281 and a negative electrode 282 extending to the outer wall of the leaching reactor 2, which are used to supply power to the turntable agitator and the heating tube, and at the same time, realize temperature control at the upper temperature measuring port 21.

[0051] In this embodiment, a second feed port 24 is provided on the side wall of the leaching reactor 2, and a second feed cover 23 is provided on the second feed port 24; a discharge port 29 is provided at the bottom of the leaching reactor 2, and the materials after the reaction are completed are discharged from the discharge port 29.

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

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

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

[0055] The leaching reactor 2 is fed with steel slag through the second feeding port 24, and the ammonium salt solution storage tank 1 can spray the leaching solution into the leaching reactor 2 through multiple water sprayers 25. After the feeding is completed, the second feeding cover 23 is closed, and clean water is added to 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 turntable stirrer 26 and the lower turntable stirrer 27 start to rotate rapidly respectively to avoid the enrichment of raw materials in the corners;

[0056] When the temperature rises to a certain level, gas will be generated in the leaching reactor 2 and discharged from the spring valve 16. The conical plug 161 in the spring valve 16 will compress the elastic member 162 upward due to pressure, and the gas will be discharged from the matching member 163 to the ammonium salt solution storage tank 1. The ammonia gas that is easily soluble in water will be absorbed, and the excess gas will be discharged from the first feeding port 14. 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, the leaching reaction process is strictly monitored through the temperature measuring port 21 and the pH detection port 22 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 sprayer 25 can be opened for spraying and flushing. After all the materials are transferred, the power supply is turned off.

[0059] In summary, in the leaching reaction process of the steel slag leaching reactor of the present invention, the gas generated can be returned to the ammonium salt solution storage tank, so that the material can be recycled and the cost can be reduced. The solution back-absorption phenomenon can also be avoided by the gas buffer tank. The present invention fully stirs the material by a rotary disk agitator, and then adopts the joint action of multiple sprinklers to avoid the enrichment of the material in a certain corner, which is conducive to the full reaction of the material, and the slag phase can also be avoided after the reaction is completed. The present invention can monitor the temperature and pH and other parameters in the leaching reactor through the temperature measuring port and the pH detection port during the leaching process to ensure stable leaching efficiency.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steel slag leaching reactor, characterized in that: include: An ammonium salt solution storage tank (1) and a leaching reactor (2) are arranged from top to bottom; The ammonium salt solution storage tank (1) and the leaching reactor (2) are connected via a gas buffer tank (19); a plurality of water sprayers (25) connected to the ammonium salt solution storage tank (1) are arranged in the leaching reactor (2); a temperature measuring port (21) and a pH detection port (22) are arranged on the leaching reactor (2); and a rotary disk agitator is arranged in the leaching reactor (2).

2. The steel slag leaching reactor according to claim 1, characterized in that: The gas buffer tank (19) is arranged at the top of the leaching reactor (2), and the gas buffer tank (19) is connected to the gas outlet at the top of the leaching reactor (2) through a steam pipeline (15).

3. The steel slag leaching reactor according to claim 2, characterized in that: The gas outlet at the top of the leaching reactor (2) is equipped with a spring valve (16).

4. The steel slag leaching reactor according to claim 1, characterized in that: The top of the leaching reactor (2) is provided with a plurality of water sprayers (25) directly connected to the ammonium salt solution storage tank (1); the side of the leaching reactor (2) is provided with a plurality of water sprayers (25) connected to the ammonium salt solution storage tank (1) through a solution delivery pipeline.

5. The steel slag leaching reactor according to claim 1, characterized in that: The ammonium salt solution storage tank (1) is provided with a stirrer (12).

6. The steel slag leaching reactor according to claim 1, characterized in that: The top of the ammonium salt solution storage tank (1) is provided with a first feeding port (14), and the first feeding port (14) is provided with a first feeding cover (13).

7. The steel slag leaching reactor according to claim 1, characterized in that: The turntable agitator comprises: an upper turntable agitator (26) and a lower turntable agitator (27); a heating rod (28) is provided between the upper turntable agitator (26) and the lower turntable agitator (27).

8. The steel slag leaching reactor according to claim 7, characterized in that: The heating rod (28) comprises: a plurality of connected heating tubes (283), with a positive electrode (281) and a negative electrode (282) extending to the outer wall of the leaching reactor (2) being provided at both ends of the heating tubes (283).

9. The steel slag leaching reactor according to claim 1, characterized in that: The side wall of the leaching reactor (2) is provided with a second feed inlet (24), and the second feed inlet (24) is provided with a second feeding cover (23); and the bottom of the leaching reactor (2) is provided with a discharge port (29).

10. The method for using the steel slag leaching reactor according to any one of claims 1 to 9, characterized in that: The steps include: Adding ammonium salt and water into an ammonium salt solution storage tank (1) to prepare an ammonium salt solution, and providing a leaching solution for a 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 the material is stirred by a rotary disk stirrer; 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 process, the reaction temperature and 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), and the water sprayer (25) is turned on for spray flushing to clean the residual material in the leaching reactor (2).

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