Activating system for carbide slag

Abstract

The invention relates to a mixing device, and provides a carbide slag activation system, which comprises a first grinding device, a pair of size mixing devices simultaneously connected with the discharge end of the first grinding device, a mixing device simultaneously connected with the pair of size mixing devices, and a second grinding device connected with the mixing device, the mixing device comprises a mixing block, a first through hole penetrating through the mixing block, a second through hole penetrating through the mixing block, a pair of connecting pipes arranged at the two ends of the first through hole respectively, a mixing pipe rotationally arranged in the second through hole, a driving device for driving the mixing pipe to rotate, and a feeding hole formed in the side wall of the mixing pipe; the first through hole is communicated with the second through hole, one end of the mixing pipe is communicated with a feed port of the second grinding device, and the other end of the mixing pipe is a closed end; the feeding hole is arranged close to the first through hole; and the pair of connecting pipes are respectively connected with the discharge ends of the pair of size mixing devices. The carbide slag activation system disclosed by the invention can be used for efficiently activating carbide slag.

Description

Technical Field

[0001] The invention relates to the technical field of mixing devices, and in particular to a carbide slag activation system. Background Art

[0002] Bauxite is the best raw material for producing aluminum and is also the most important application area. Its consumption accounts for more than 90% of the world's total bauxite production. Among the processes for preparing aluminum using bauxite, the Bayer process is a more common one. Its principle is to convert the alumina hydrate in bauxite into sodium aluminate with concentrated sodium hydroxide solution, and re-precipitate the aluminum hydroxide by dilution and adding aluminum hydroxide seeds. The remaining sodium aluminate solution, also called mother liquor, is reused to process the next batch of bauxite, realizing continuous production.

[0003] In the early stage of aluminum preparation from bauxite, it is necessary to mix bauxite with lime to prepare raw slurry. A large amount of lime is consumed. Carbide slag is the waste slag with calcium hydroxide as the main component after acetylene gas is obtained by hydrolysis of calcium carbide. After the carbide slag is activated by an activator, the carbide slag can be used instead of lime to dissolve alumina in aluminum preparation. The common carbide slag activation method is to grind the carbide slag into slurry, and then add an activator to the slurry for activation. However, due to the high solid content in the carbide slag slurry, it is difficult for the carbide slag to be fully and evenly dispersed in the slurry, and the stirring effect of the slurry is poor. It is usually improved by adding a large amount of water to improve the fluidity of the slurry, thereby improving the contact efficiency between the activator and the carbide slag and the activation efficiency. However, the amount of carbide slag that can be activated at a single time is small, and the production efficiency is not high. Summary of the invention

[0004] The object of the present invention is to provide a carbide slag activation system, which can efficiently activate carbide slag.

[0005] The embodiment of the present invention is realized through the following technical scheme: the carbide slag activation system of the present invention comprises a first grinding device, a pair of slurry mixing devices simultaneously connected to the discharge end of the first grinding device, a mixing device simultaneously connected to the pair of slurry mixing devices, and a second grinding device connected to the mixing device; the mixing device comprises a mixing block, a first through hole penetrating the mixing block, a second through hole penetrating the mixing block, a pair of connecting pipes respectively arranged at both ends of the first through hole, a mixing pipe rotatably arranged in the second through hole, a driving device for driving the mixing pipe to rotate, and a feed hole opened on the side wall of the mixing pipe; the first through hole and the second through hole are connected, one end of the mixing pipe is connected to the feed port of the second grinding device, and the other end is a closed end; the feed hole is arranged close to the first through hole; the pair of connecting pipes are respectively connected to the discharge ends of the pair of slurry mixing devices.

[0006] Furthermore, the mixing device also includes a grouting pipe arranged in the mixing pipe, and a plurality of nozzles arranged on the side wall of the grouting pipe; the grouting pipe is connected to the activator supply device.

[0007] Furthermore, there are multiple grouting pipes, and the multiple grouting pipes are distributed in a circle around the axis of the mixing tube; a slurry guide chamber is provided at the closed end of the mixing tube, and the multiple grouting pipes are connected to the slurry guide chamber, and the slurry guide chamber is connected to a first conduit at one end away from the grouting pipe, the first conduit is sealingly and rotatably connected to a second conduit, and the second conduit is connected to the mixing block through a support rod; the second conduit is connected to the activator supply device.

[0008] Furthermore, the driving device includes a driven wheel arranged on the outer wall of the mixing tube, a first motor fixedly arranged on the outer wall of the mixing block, a driving wheel arranged on the output shaft of the first motor, and a belt for connecting the driving wheel and the driven wheel.

[0009] Furthermore, the first grinding device is a dry ball mill, and the second grinding device is a wet ball mill.

[0010] Furthermore, the slurry mixing device includes a tank body, a stirring device arranged in the tank body, a first feed pipe connected to the upper end of the tank body, an air intake pipe connected to the upper end of the tank body, a second feed pipe connected to the side wall of the air intake pipe, and a water injection pipe connected to the upper end of the tank body.

[0011] Furthermore, the stirring device includes a stirring shaft arranged in the tank body, a plurality of blades arranged on the stirring shaft, and a second motor connected to the stirring shaft.

[0012] Furthermore, the height of the tank body is higher than the height of the mixing block.

[0013] The technical scheme of the present invention has at least the following advantages and beneficial effects: the carbide slag activation system of the present invention, when in use, first puts solid carbide slag into a first grinding device for preliminary grinding, then puts the ground carbide powder into two slurry mixing devices respectively, adds water and a part of the activator into the carbide powder in the slurry mixing device, and stirs it into slurry, and then sends the slurry to the mixing device through a connecting pipe, in which the slurry enters the first through hole through the connecting pipe and is blocked by the mixing tube, when the mixing tube rotates to the point where the feed hole is connected to one side of the first through hole, the slurry on this side enters the mixing tube through the feed hole, and enters the second grinding device through the mixing tube for grinding, because the mixing tube is in a continuous rotating state under the action of the driving device, so that the slurry on both sides of the mixing tube is fed alternately, which is equivalent to cutting the slurry discharged from the two slurry mixing devices into small sections through the rotation of the mixing tube, mixing them in the mixing tube, and finally merging them into the second grinding device for grinding and mixing. In this way, the carbide slag can be better ground into particles through two-stage grinding, and the carbide and activator can be fully mixed and uniformly through the mixing device. Due to the mixing effect of the mixing device, it is not necessary to add a large amount of water to improve the mixing effect, which can increase the carbide content in the slurry. And the whole system can realize continuous production to ensure production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 A structural schematic diagram of a carbide slag activation system provided by an embodiment of the present invention;

[0016] Figure 2 A schematic diagram of the structure of a mixing device part provided in an embodiment of the present invention;

[0017] Figure 3 A schematic structural diagram of a mixing device provided by an embodiment of the present invention from a perspective of the interior;

[0018] Figure 4 A schematic diagram of the structure of the mixing device provided by an embodiment of the present invention from two perspectives;

[0019] Figure 5 A schematic diagram of the structure of a mixing block part provided by an embodiment of the present invention;

[0020] Figure 6 A schematic diagram of the structure of a mixing tube part provided by an embodiment of the present invention;

[0021] Figure 7 This is a schematic diagram of the internal structure of a slurry mixing device provided in an embodiment of the present invention.

[0022] Icons: 11-first grinding device, 12-second grinding device, 20-slurry mixing device, 21-tank body, 22-first feed pipe, 23-air inlet pipe, 24-second feed pipe, 25-water injection pipe, 26-stirring shaft, 27-blade, 28-second motor, 30-mixing device, 31-mixing block, 32-first through hole, 33-second through hole, 34-connecting pipe, 35-mixing pipe, 36-feed hole, 37-grouting pipe, 38-nozzle, 39-slurry guide chamber, 310-first conduit, 311-second conduit, 312-support rod, 313-first motor, 314-driving wheel, 315-transmission belt, 316-driven wheel. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions 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 part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply 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 a limitation on the present invention.

[0027] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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.

[0028] Example

[0029] The following is further described in conjunction with specific embodiments. Figure 1 -Attached Figure 7 As shown, the carbide slag activation system of this embodiment includes a first grinding device 11, a pair of slurry mixing devices 20 simultaneously connected to the discharge end of the first grinding device 11, a mixing device 30 simultaneously connected to the pair of slurry mixing devices 20, and a second grinding device 12 connected to the mixing device 30; the mixing device 30 includes a mixing block 31, a first through hole 32 penetrating the mixing block 31, a second through hole 33 penetrating the mixing block 31, a pair of connecting pipes 34 respectively arranged at both ends of the first through hole 32, a mixing pipe 35 rotatably arranged in the second through hole 33, a driving device for driving the mixing pipe 35 to rotate, and a feeding hole 36 opened on the side wall of the mixing pipe 35; the first through hole 32 and the second through hole 33 are connected, one end of the mixing pipe 35 is connected to the feeding port of the second grinding device 12, and the other end is a closed end; the feeding hole 36 is arranged near the first through hole 32; the pair of connecting pipes 34 are respectively connected to the discharge ends of the pair of slurry mixing devices 20. Specifically, when in use, solid carbide slag is first put into the first grinding device 11 for preliminary grinding, and then the ground carbide powder is put into two slurry mixing devices 20 respectively, water and part of the activator are added to the carbide powder in the slurry mixing device 20, and it is stirred into slurry, and then the slurry is sent to the mixing device 30 through the connecting pipe 34. In the mixing device 30, the slurry enters the first through hole 32 through the connecting pipe 34 and is blocked by the mixing pipe 35. When the mixing pipe 35 rotates to the feeding hole 36 and the first through hole 32, the mixing pipe 35 is blocked by the mixing pipe 35. When one side of the hole 32 is connected, the slurry on this side enters the mixing tube 35 through the feed hole 36, and enters the second grinding device 12 through the mixing tube 35 for grinding. Since the mixing tube 35 is in a continuously rotating state under the action of the driving device, the slurries on both sides of the mixing tube 35 are fed alternately, which is equivalent to cutting the slurries discharged from the two slurry mixing devices 20 into small sections through the rotation of the mixing tube 35, and mixing them in the mixing tube 35, and finally merging them into the second grinding device 12 for grinding and mixing. In this way, the carbide slag can be better ground into microparticles through two-stage grinding, and the carbide and the activator can be fully mixed and uniform through the mixing device 30. And the whole system can realize continuous production and ensure production efficiency.

[0030] The mixing device 30 in this embodiment also includes a grouting pipe 37 disposed in the mixing pipe 35, and a plurality of nozzles 38 disposed on the side wall of the grouting pipe 37; the grouting pipe 37 is connected to the activator supply device. Specifically, part of the activator is mixed into the calcium carbide slurry in the slurry mixing device 20, and then the activator and the activator are sent into the mixing pipe 35 through the grouting pipe 37 to be evenly mixed with the calcium carbide slurry in the mixing pipe 35. During the mixing process, the grouting pipe 37 will rotate with the mixing pipe 35, while the slurry will not rotate with the mixing pipe 35, so there will be relative rotation between the grouting pipe 37 and the slurry, so that when the activator is sprayed out through the nozzle 38, it can be sprayed more evenly in the slurry.

[0031] In this embodiment, there are multiple grouting pipes 37, which are distributed in a circle around the axis of the mixing tube 35; a slurry guide chamber 39 is provided at the closed end of the mixing tube 35, and the multiple grouting pipes 37 are all connected to the slurry guide chamber 39, and the end of the slurry guide chamber 39 away from the grouting pipe 37 is connected to the first conduit 310, and the first conduit 310 is sealed and rotatably connected to the second conduit 311, and the second conduit 311 is connected to the mixing block 31 through the support rod 312; the second conduit 311 is connected to the activator supply device. Specifically, the multiple grouting pipes 37 can improve the uniformity of the activator entering the slurry, and the activator supply device pumps the activator into the second conduit 311, then into the first conduit 310, and then into the slurry guide chamber 39, and distributes the activator to each grouting pipe 37 through the slurry guide chamber 39, and finally sprays it out through the nozzle 38.

[0032] The driving device in this embodiment includes a driven wheel 316 disposed on the outer wall of the mixing tube 35, a first motor 313 fixedly disposed on the outer wall of the mixing block 31, a driving wheel 314 disposed on the output shaft of the first motor 313, and a belt for connecting the driving wheel 314 and the driven wheel 316. Specifically, in addition to belt drive, sprocket drive, gear drive, etc. can also be used.

[0033] In this embodiment, the first grinding device 11 is a dry ball mill, and the second grinding device 12 is a wet ball mill. Specifically, there are various types of activators, including solid powder and liquid. For liquid activators, it is not convenient to mix with calcium carbide for grinding at the beginning. Therefore, the calcium carbide slag is first ground to a certain particle size using dry ball milling balls, and then slurried and mixed with the activator, and finally sent to the wet ball mill for further grinding. The slurry can also be finally mixed in the wet ball mill.

[0034] The slurry mixing device 20 in this embodiment includes a tank body 21, a stirring device arranged in the tank body 21, a first feed pipe 22 connected to the upper end of the tank body 21, an air intake pipe 23 connected to the upper end of the tank body 21, a second feed pipe 24 connected to the side wall of the air intake pipe 23, and a water injection pipe 25 connected to the upper end of the tank body 21. Specifically, the powdered calcium carbide powder is fed into the tank body 21 through the first feed pipe 22, and then water is fed into the tank body 21 through the water injection pipe 25. Then, the valves on the first feed pipe 22 and the water injection pipe 25 are closed, and the air compressor is connected to the air inlet pipe 23. Air is sent into the tank body 21 through the air compressor. During the air supply process, since the air inlet pipe 23 is under negative pressure, the activator is sucked through the second feed pipe 24 and sprayed into the tank body 21. The activator is efficiently mixed under the action of the stirring device. After the mixing is completed, since the tank body 21 is still under high pressure, the high pressure will push the thick slurry in the tank body 21 to flow into the mixing device 30 through the connecting pipe 34. In this way, there is no need to set up a special feeding pump or other structures, and even if the concentration of calcium carbide in the slurry is high, the slurry as a whole can flow smoothly.

[0035] The stirring device in this embodiment includes a stirring shaft 26 disposed in the tank body 21 , a plurality of blades 27 disposed on the stirring shaft 26 , and a second motor 28 connected to the stirring shaft 26 .

[0036] The height of the tank body 21 in this embodiment is higher than the height of the mixing block 31. Specifically, a higher tank body 21 can facilitate the flow of the slurry.

[0037] In summary, the carbide slag activation system of the present embodiment, when in use, firstly puts the solid carbide slag into the first grinding device 11 for preliminary grinding, and then puts the ground carbide powder into two slurry mixing devices 20 respectively, adds water and part of the activator to the carbide powder in the slurry mixing device 20, and stirs it into slurry, and then sends the slurry to the mixing device 30 through the connecting pipe 34, and in the mixing device 30, the slurry enters the first through hole 32 through the connecting pipe 34 and is blocked by the mixing pipe 35. When the mixing pipe 35 rotates to the feed hole When the first through hole 36 is connected to one side of the first through hole 32, the slurry on the side enters the mixing tube 35 through the feed hole 36, and enters the second grinding device 12 through the mixing tube 35 for grinding. Since the mixing tube 35 is in a state of continuous rotation under the action of the driving device, the slurries on both sides of the mixing tube 35 are fed alternately, which is equivalent to cutting the slurries discharged from the two slurry mixing devices 20 into small sections through the rotation of the mixing tube 35, and mixing them in the mixing tube 35, and finally merging them into the second grinding device 12 for grinding and mixing. In this way, the carbide slag can be better ground into microparticles through two-stage grinding, and the carbide and the activator can be fully mixed and uniform through the mixing device 30. And the whole system can realize continuous production and ensure production efficiency.

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A carbide slag activation system, characterized in that: It comprises a first grinding device (11), a pair of slurry mixing devices (20) simultaneously connected to the discharge end of the first grinding device (11), a mixing device (30) simultaneously connected to the pair of slurry mixing devices (20), and a second grinding device (12) connected to the mixing device (30); The mixing device (30) comprises a mixing block (31), a first through hole (32) penetrating the mixing block (31), a second through hole (33) penetrating the mixing block (31), a pair of connecting pipes (34) respectively arranged at two ends of the first through hole (32), a mixing pipe (35) rotatably arranged in the second through hole (33), a driving device for driving the mixing pipe (35) to rotate, and a feed hole (36) opened on a side wall of the mixing pipe (35); The first through hole (32) and the second through hole (33) are connected; one end of the mixing tube (35) is connected to the feed port of the second grinding device (12), and the other end is a closed end; the feed hole (36) is arranged close to the first through hole (32); and the pair of connecting tubes (34) are respectively connected to the discharge ends of the pair of slurry mixing devices (20).

2. The carbide slag activation system according to claim 1, characterized in that: The mixing device (30) further comprises a grouting pipe (37) arranged in the mixing pipe (35), and a plurality of nozzles (38) arranged on the side wall of the grouting pipe (37); the grouting pipe (37) is connected to an activator supply device.

3. The carbide slag activation system according to claim 2, characterized in that: The grouting pipes (37) are provided in plurality, and the plurality of grouting pipes (37) are distributed in a circle around the axis of the mixing pipe (35); The closed end of the mixing tube (35) is provided with a slurry guide chamber (39), and the plurality of grouting pipes (37) are all connected to the slurry guide chamber (39); one end of the slurry guide chamber (39) away from the grouting pipe (37) is connected to a first conduit (310); the first conduit (310) is sealingly and rotatably connected to a second conduit (311); the second conduit (311) is connected to the mixing block (31) via a support rod (312); The second conduit (311) is in communication with the activator supply device.

4. The carbide slag activation system according to claim 1, characterized in that: The driving device comprises a driven wheel (316) arranged on the outer wall of the mixing tube (35), a first motor (313) fixedly arranged on the outer wall of the mixing block (31), a driving wheel (314) arranged on the output shaft of the first motor (313), and a belt for connecting the driving wheel (314) and the driven wheel (316).

5. The carbide slag activation system according to claim 1, characterized in that: The first grinding device (11) is a dry ball mill, and the second grinding device (12) is a wet ball mill.

6. The carbide slag activation system according to claim 1, characterized in that: The slurry mixing device (20) comprises a tank body (21), a stirring device arranged in the tank body (21), a first feed pipe (22) connected to the upper end of the tank body (21), an air intake pipe (23) connected to the upper end of the tank body (21), a second feed pipe (24) connected to the side wall of the air intake pipe (23), and a water injection pipe (25) connected to the upper end of the tank body (21).

7. The carbide slag activation system according to claim 6, characterized in that: The stirring device comprises a stirring shaft (26) arranged in the tank body (21), a plurality of blades (27) arranged on the stirring shaft (26), and a second motor (28) connected to the stirring shaft (26).

8. The carbide slag activation system according to claim 6, characterized in that: The height of the tank body (21) is higher than the height of the mixing block (31).

Images