White mud separation treatment device and treatment method

Abstract

The application relates to a white mud separation treatment device and treatment method, and relates to the technical field of white mud separation treatment.The device comprises a reaction kettle, the inside of the reaction kettle is sequentially provided with a reaction chamber, a throat channel and a separation chamber from bottom to top, the separation chamber is internally provided with an exhaust pipe assembly coaxial with the throat channel, the exhaust pipe assembly is configured to be telescopic, one side of the separation chamber is provided with a feeding port, the feeding port is tangent to and communicates with the separation chamber, a gas distributor is arranged on the bottom end inner wall of the reaction chamber, an air inlet assembly for circulating neutralization gas is arranged below the gas distributor, one end of the air inlet assembly is connected with a gas pumping device, the other end is connected with the gas distributor, and a driving fan blade is arranged in the air inlet assembly.The driving fan blade is pushed by the neutralization gas, the white mud slurry is fully contacted and mixed with the neutralization gas, the carbon black with light quality can be reversely swept and recovered by the neutralization gas, the white mud slurry separation and neutralization treatment are simultaneously realized, and the production energy consumption is reduced.

Description

Technical Field

[0001] This application relates to the field of white mud separation and treatment technology, and in particular to a white mud separation and treatment device and treatment method. Background Technology

[0002] White mud, whose main components are calcium oxide, calcium carbonate and calcium hydroxide, is a byproduct of the causticizing section of alkali recovery. During the causticizing process, in order to maximize the causticizing efficiency, an excessive amount of lime is usually added, resulting in a small amount of calcium hydroxide remaining in the white liquor and the precipitated white mud. Finally, the washed white mud contains a small amount of residual calcium hydroxide and sodium hydroxide.

[0003] The conventional methods for treating white mud are to fill pits and bury it or to neutralize the calcium hydroxide and sodium hydroxide in the white mud by introducing carbon dioxide. This is low-carbon and environmentally friendly, and the treated white mud can also be used as a filler in the papermaking industry.

[0004] The existing white mud light calcium carbonate still contains a small amount of carbon black, which makes the paper produced when it is used as a filler in the papermaking industry less than ideal. At the same time, the white mud is treated with carbon dioxide, which requires a lot of equipment, complicated procedures, high energy consumption and low efficiency. Summary of the Invention

[0005] This application provides a white mud separation and treatment equipment and method, which can solve the problems of poor treatment effect, high energy consumption and low efficiency in the existing white mud treatment.

[0006] The technical solution of this application is as follows: A white mud separation and treatment device for separating and purifying impurities in white mud, including a reaction vessel, wherein a reaction chamber, a throat channel and a separation chamber are arranged sequentially from bottom to top inside the reaction vessel, and an exhaust pipe assembly coaxial with the throat channel is provided inside the separation chamber. The exhaust pipe assembly is configured to be telescopic to adjust the height of the lower end in the vertical direction. A feed inlet is provided on one side of the separation chamber, and the feed inlet is tangential to and connected to the separation chamber.

[0007] A gas distributor is provided on the inner wall at the bottom of the reaction chamber. Below the gas distributor is an air intake assembly for the flow of neutralizing gas. One end of the air intake assembly is connected to a gas pump, and the other end is connected to the gas distributor. The air intake assembly is equipped with a drive fan blade. The drive fan blade is designed to rotate under the push of the neutralizing gas, so as to consume the kinetic energy of the neutralizing gas and drive the gas distributor to rotate inside the reaction chamber.

[0008] By adopting the above scheme and setting up a retractable exhaust pipe assembly, when the neutralizing gas is introduced from below the device, the kinetic energy of the neutralizing gas drives the drive fan blades. The drive fan blades drive the gas distributor to rotate, thereby agitating the white mud slurry. This allows the white mud slurry to fully contact and mix with the neutralizing gas. At the same time, the neutralizing gas, after being decelerated, can remain in the white mud slurry for a longer time, thus forming a fluidized bed inside the reaction chamber to neutralize the calcium hydroxide and sodium hydroxide in the white mud slurry. In addition, unreacted neutralizing gas, after passing through the white mud slurry, enters the throat channel through a contraction process. The secondary acceleration method, although consuming some gas kinetic energy to drive the fan blades, can still ensure that the gas reaches a critical velocity at the throat sufficient to purge carbon black by rationally designing the contraction ratio of the reaction chamber and the throat channel and controlling the initial air intake velocity. Meanwhile, the lighter carbon black enriched in the white mud slurry, which enters tangentially above, can be back-blown by the unreacted neutralizing gas under the action of centrifugal force and blown to the outside through the exhaust pipe assembly. This achieves the separation of carbon black in the white mud slurry while increasing the rate of neutralization treatment of the white mud slurry, reducing production steps and the introduced equipment, and thus reducing production energy consumption.

[0009] In one embodiment of this application, the exhaust pipe assembly includes:

[0010] The fixed cylinder is an inverted frustum-shaped component that is rotatably assembled on the upper end of the separation chamber. The fixed cylinder has a vertically extending threaded channel in the middle.

[0011] An exhaust pipe is threaded into the inside of the threaded channel. One end of the exhaust pipe passes through the fixed cylinder and is slidably connected to the reaction vessel through a connector, while the other end extends to the throat channel.

[0012] The fixed cylinder has a toothed ring on its outer top, and a drive motor is fixedly mounted on the upper end of the reactor. The drive shaft of the drive motor has a drive gear, and the drive gear meshes with the toothed ring.

[0013] By adopting the above scheme, since the solid content of the white mud slurry varies, when white mud slurry with different solid contents is introduced, the drive motor is turned on, and the drive motor drives the gear to rotate, thereby causing the fixed cylinder to rotate at the upper end of the reactor. At the same time, since the fixed cylinder and the exhaust pipe are threadedly connected, and the exhaust pipe is slidably connected to the reactor, when the fixed cylinder rotates, the force between the threads controls the up and down movement of the exhaust pipe in the separation chamber, thereby adjusting the position of the lower end of the exhaust pipe. This allows the device to precisely control the position of carbon black recovery, i.e., the separation point of solid-gas separation of the white mud slurry by the rising neutralization gas, according to the white mud slurry with different solid contents.

[0014] In one embodiment of this application, the connector includes:

[0015] A connecting rod, one end of which is fixedly mounted on the outer wall of the reactor;

[0016] A slip ring is provided, with the other end of the connecting rod connected and fixed to the slip ring. The slip ring is sleeved on the outside of the exhaust pipe and slidably connected to the exhaust pipe.

[0017] By adopting the above scheme, and by setting a connecting rod and a slip ring, a guide rail is provided for the exhaust pipe to slide in the vertical direction when the fixed cylinder rotates, so that the exhaust pipe can slide up and down inside the slip ring.

[0018] In one embodiment of this application, a shaping ring assembly is further included, the shaping ring assembly including at least two fixing rings, the at least two fixing rings being spaced apart along the length direction of the throat channel on the inner wall of the throat channel.

[0019] By adopting the above scheme, and by setting at least two sets of fixing rings on the inner wall of the throat channel, when the white mud slurry enters the separation chamber tangentially, under the action of centrifugal force, the larger calcium carbonate particles in the white mud slurry can be separated and move downward along the inner wall of the separation chamber to form a turbulent slurry layer. When the calcium carbonate particles pass through the fixing rings, the presence of the fixing rings can, on the one hand, prevent the slurry from short-circuiting and falling directly to the bottom, thus prolonging its residence time, and on the other hand, it can impact and disperse the particles, thus achieving a certain effect of particle size uniformity.

[0020] In one embodiment of this application, the reactor is an hourglass-shaped container component, the reaction chamber, the throat channel and the separation chamber are interconnected, and the inner wall shape of the reaction chamber is designed to compress the neutralizing gas, such that the flow rate of the neutralizing gas when entering the throat channel is greater than the suspension velocity of the carbon black and less than the suspension velocity of the calcium carbonate particles.

[0021] By adopting the above scheme, by adjusting the contraction ratio of the reaction chamber and the throat channel, and simultaneously adjusting the initial velocity of the neutralizing gas pumped into the device, the unreacted neutralizing gas can be accelerated after compression, so that its velocity is greater than the suspension velocity of the carbon black and less than the suspension velocity of the calcium carbonate particles, thereby achieving reverse blowing and separation and recovery of carbon black in the white mud slurry.

[0022] In one embodiment of this application, the intake assembly includes:

[0023] An air intake chamber, wherein a rotating column is rotatably connected inside the air intake chamber, and drive fan blades are arranged at intervals along the circumference of one end of the rotating column.

[0024] An air intake pipe is provided on one side of the air intake chamber, and the air intake pipe is connected to the air pumping equipment;

[0025] One end of the air intake chamber is connected to the gas distributor, and the other end of the rotating column passes through the air intake chamber and is connected and fixed to the gas distributor.

[0026] By adopting the above scheme, when the neutralized gas enters the air inlet chamber, the kinetic energy of the neutralized gas itself can be converted into the kinetic energy of the driving fan blades, so that the driving fan blades can rotate inside the air inlet chamber, thereby driving the gas distributor to rotate inside the reaction chamber and performing a preliminary stirring effect on the reaction chamber. At the same time, when the neutralized gas passes through the gas distributor, it can be more evenly dispersed into the interior of the reactor, thereby forming a gas-liquid-solid mixed fluidized bed, which allows the white mud slurry to react fully with carbon dioxide.

[0027] In one embodiment of this application, a support frame assembly and a discharge pipe are further included, the support frame assembly comprising:

[0028] A placement rack, wherein a vibration groove extending vertically is provided at the upper end of the placement rack;

[0029] A support frame is provided above the placement frame. A connecting block is provided at the lower end of the support frame. One end of the connecting block extends into the vibration groove and is connected and fixed to the bottom inner wall of the vibration groove through an elastic element.

[0030] The discharge pipe is installed at the bottom of the reaction chamber and is connected to the reaction chamber.

[0031] By adopting the above scheme, when the white mud slurry is introduced into the equipment, the impact between the white mud slurry and the reaction chamber, the collision between the calcium carbonate particles and the fixed ring, and the vibration generated by the drive motor during operation can all be transmitted to the elastic element. This causes the elastic element to deform with the vibration, which in turn causes the entire equipment to vibrate continuously on the placement frame. This causes the gas film of the bubbles when carbon dioxide gas is introduced into the white mud slurry to break down rapidly, thereby further improving the reaction rate of the white mud slurry inside.

[0032] In one embodiment of this application, the gas distributor has a plurality of arc-shaped grooves spaced apart along its circumference on its outer wall.

[0033] By adopting the above scheme, circumferentially distributed arc-shaped grooves are set on the outside of the gas distributor, thereby increasing the friction coefficient between the gas distributor and the white mud slurry, so that the gas distributor can better stir the white mud slurry when rotating.

[0034] The second objective of this invention is to provide a method for separating and processing white mud.

[0035] The technical solution is as follows: A method for separating and treating white mud, using a white mud separation and treatment device to treat white mud, includes the following steps:

[0036] S1: The white mud is transported to the dispersion tank, diluted with process water to a slurry with a solid content of 30%-35%, and impurities and lime particles are preliminarily screened out by a vibrating screen to obtain white mud slurry.

[0037] S2: Use white mud separation and treatment equipment to separate carbon black from white mud slurry, add modifier to white mud slurry, and introduce carbon dioxide gas to neutralize white mud slurry to form modified white mud slurry;

[0038] S3: Pump the modified white mud slurry into the particle size equalizer and perform a second sieve to obtain the product.

[0039] By adopting the above scheme, a modifier is added to the white mud slurry before carbon dioxide is introduced, and then carbon dioxide gas is introduced. This allows the device to neutralize the calcium hydroxide and sodium hydroxide in the white mud slurry, while simultaneously generating modified calcium carbonate. When this modified calcium carbonate is used as a paper filling material, the paper's performance can be improved.

[0040] In one embodiment of this application, the modifier is cationic starch or sodium silicate.

[0041] By adopting the above scheme, when cationic starch is added, the cationic starch molecular chains will be adsorbed onto the surface of the negatively charged white mud particles through electrostatic attraction. The positively charged starch layer on the surface will increase the affinity between the white mud particle surface and the negatively charged pulp fibers, thereby improving the retention rate of the white mud particles in the papermaking process. It can also act as a retention aid to improve the retention rate of fine fibers and other fillers. At the same time, starch molecules can enhance the binding force between fibers, thus avoiding the problem that traditional fillers will reduce the paper strength.

[0042] When sodium silicate is added, it reacts in a carbon dioxide atmosphere to form amorphous or hydrated silica. As the carbonization reaction proceeds, newly generated nano-calcium carbonate and / or silica are deposited and coated on the surface of the original white mud particles, forming a stable composite structure with white mud particles as the core and newly generated calcium carbonate and silica as the shell. The coated silica can significantly improve the whiteness and light scattering ability of the filler, improve the opacity of the paper, and at the same time, its porous structure can improve the ink absorption performance of the paper and improve its printability.

[0043] In summary, this application includes at least one of the following beneficial technical effects: by setting the separation chamber above the reaction chamber and tangentially introducing the white mud slurry into the separation chamber, the carbon black in the white mud slurry is separated. The equipment also introduces neutralizing gas into the reaction chamber from below. The neutralizing gas can not only react with the white mud slurry, but also drive the gas distributor to rotate to agitate the white mud slurry with the kinetic energy of the carbon dioxide gas. At the same time, the unreacted neutralizing gas can also back-purge and recover the separated carbon black, thereby highly integrating the separation and neutralization operations that were originally carried out separately in the process, reducing the number of process steps and reducing production energy consumption.

[0044] By setting up an exhaust pipe assembly, the device can adjust the position of the lower end of the exhaust pipe assembly inside the device according to the white mud slurry with different solid contents. This allows the neutralizing gas rising in the opposite direction to back purge the carbon black concentrated in the throat channel, thereby adjusting the separation point of gas-solid separation in the separation operation. As a result, the device can accurately separate white mud slurry with different solid contents.

[0045] By optimizing the white mud treatment process and adding modifiers, the neutralizing gas can not only neutralize the alkaline white mud slurry, but also work together with the modifiers to form a modified layer on the outside of the white mud particles, which is coated with the modifier. This improves the performance of the white mud as a filler in papermaking and thus improves the performance of the manufactured paper. Attached Figure Description

[0046] Figure 1 This is a plan sectional view of a white mud separation and treatment device provided in the embodiments of this application;

[0047] Figure 2 This is a perspective view of an exhaust pipe assembly of a white mud separation and treatment device provided in an embodiment of this application;

[0048] Figure 3 This is a front sectional view of an exhaust pipe assembly of a white mud separation and treatment device provided in an embodiment of this application;

[0049] Figure 4 yes Figure 1 An enlarged schematic diagram of part A in the middle;

[0050] Figure 5 This is a perspective view of a fixing ring for a white mud separation and treatment device provided in the embodiments of this application;

[0051] Figure 6 This is a perspective view of a gas distributor for a white mud separation and treatment device provided in the embodiments of this application;

[0052] Figure 7This is a process flow diagram of a white mud separation and treatment method provided in the embodiments of this application.

[0053] Explanation of reference numerals in the attached drawings: 1. Reactor; 11. Reaction chamber; 12. Throat channel; 13. Separation chamber; 131. Feed inlet; 14. Exhaust pipe assembly; 141. Fixed cylinder; 1411. Gear ring; 142. Exhaust pipe; 143. Connector; 1431. Connecting rod; 1432. Slip ring; 144. Drive motor; 1441. Drive gear; 2. Gas distributor; 21. Arc-shaped groove; 3. Air intake assembly; 31. Drive fan blade; 32. Air intake chamber; 321. Air intake pipe; 33. Rotating column; 4. Shaping ring assembly; 41. Fixed ring; 5. Support frame assembly; 51. Placement frame; 511. Vibration groove; 52. Support frame; 521. Connecting block; 53. Elastic element; 6. Discharge pipe. Detailed Implementation

[0054] The following is in conjunction with the appendix Figure 1 - Figure 7 This application provides a more detailed description of the white mud separation and treatment equipment and method. Example

[0055] This application provides a white mud separation and treatment device for separating and purifying impurities in white mud, including a reaction vessel 1.

[0056] Please see Figure 1 The reactor 1 is provided with a reaction chamber 11, a throat channel 12 and a separation chamber 13 arranged sequentially from bottom to top. The separation chamber 13 is provided with an exhaust pipe assembly 14 coaxial with the throat channel 12. The exhaust pipe assembly 14 is configured to be telescopic to adjust the height of the lower end in the vertical direction. The separation chamber 13 is provided with a feed inlet 131 on one side. The feed inlet 131 is tangent to and connected to the separation chamber 13.

[0057] A gas distributor 2 is provided on the inner wall of the bottom end of the reaction chamber 11. Below the gas distributor 2 is an air inlet assembly 3 for the flow of neutralizing gas. One end of the air inlet assembly 3 is connected to a pumping device, and the other end is connected to the gas distributor 2. The air inlet assembly 3 is equipped with a drive fan blade 31. The drive fan blade 31 is designed to rotate under the push of the neutralizing gas, so as to consume the kinetic energy of the neutralizing gas and drive the gas distributor 2 to rotate inside the reaction chamber 11. By using the kinetic energy of the neutralizing gas to drive the drive fan blade 31, the gas distributor 2 is driven to rotate, so that the white mud slurry can be stirred and fully mixed with the neutralizing gas. The unreacted neutralizing gas can back-purge and recover the lighter carbon black enriched at the throat channel 12. The separation and neutralization of the white mud slurry are realized simultaneously, reducing the production process and the introduced equipment, thereby reducing production energy consumption.

[0058] In this embodiment, the neutralizing gas is carbon dioxide gas, which can be generated and separated from industrial waste gas, thus making the device more low-carbon and environmentally friendly.

[0059] The solid content of the white mud slurry is 30%-35%.

[0060] Please see Figure 2 The exhaust pipe assembly 14 includes a fixed cylinder 141 and an exhaust pipe 142. The fixed cylinder 141 is an inverted frustum-shaped component and is rotatably mounted on the upper end of the separation chamber 13. The fixed cylinder 141 has a vertically extending threaded channel in the middle. The exhaust pipe 142 is threaded into the inside of the threaded channel. One end of the exhaust pipe 142 extends out of the fixed cylinder 141 and is slidably connected to the reaction vessel 1 through a connector 143. The other end extends to the throat channel 12. A toothed ring is provided on the outer side of the top end of the fixed cylinder 141. 1411, A drive motor 144 is fixedly mounted on the upper end of the reaction vessel 1. The drive shaft of the drive motor 144 is provided with a drive gear 1441. The drive gear 1441 meshes with the gear ring 1411. Due to the different solid content of the white mud slurry, the fixed cylinder 141 is rotated by turning on the drive motor 144. The fixed cylinder 141 is threadedly engaged with the exhaust pipe 142, and the exhaust pipe 142 is controlled to move up and down in the separation chamber 13, thereby precisely controlling the separation point of solid-gas separation of the white mud slurry.

[0061] Please continue reading. Figure 2 and Figure 3 The connecting member 143 includes a connecting rod 1431 and a slip ring 1432. One end of the connecting rod 1431 is fixedly mounted on the outer wall of the reactor 1, and the other end of the connecting rod 1431 is connected and fixed to the slip ring 1432. The slip ring 1432 is sleeved on the outside of the exhaust pipe 142 and is slidably connected to the exhaust pipe 142. By setting the slip ring 1432, the exhaust pipe 142 can slide stably up and down inside the slip ring 1432.

[0062] Please see Figure 5 It also includes a shaping ring assembly 4, which includes at least two fixing rings 41. The at least two fixing rings 41 are spaced apart on the inner wall of the throat channel 12 along the length direction of the throat channel 12. By setting at least two sets of fixing rings 41 on the inner wall of the throat channel 12, the large particles of calcium carbonate that are separated are decelerated when passing through the fixing rings 41, and a certain particle size uniformity effect is achieved.

[0063] Please see Figure 1The reactor 1 is an hourglass-shaped container. The reaction chamber 11, the throat channel 12, and the separation chamber 13 are interconnected. The inner wall of the reaction chamber 11 is designed to compress the neutralizing gas, so that the flow velocity of the neutralizing gas when entering the throat channel 12 is greater than the suspension velocity of carbon black and less than the suspension velocity of calcium carbonate particles. By customizing the contraction ratio of the reaction chamber 11 and the throat channel 12, the unreacted neutralizing gas can be accelerated after compression, and its velocity can be greater than the suspension velocity of carbon black and less than the suspension velocity of calcium carbonate particles, thereby achieving reverse purging and separation and recovery of carbon black in the white mud slurry.

[0064] Please see Figure 1 The air intake assembly 3 includes an air intake chamber 32, inside which a rotating column 33 is rotatably connected. Driven fan blades 31 are spaced apart along the circumference of one end of the rotating column 33. An air intake pipe 321 is provided on one side of the air intake chamber 32 and is connected to a pumping device. One end of the air intake chamber 32 is connected to the gas distributor 2, and the other end of the rotating column 33 passes through the air intake chamber 32 and is fixedly connected to the gas distributor 2. By utilizing the kinetic energy of the neutralized gas, the drive fan blades 31 can rotate inside the air intake chamber 32, enabling the entire gas distributor 2 to perform a preliminary stirring action, thereby allowing the white mud slurry to fully react with carbon dioxide.

[0065] Please see Figure 1 and Figure 4 It also includes a support frame assembly 5 and a discharge pipe 6. The support frame assembly 5 includes a placement frame 51 and a support frame 52. The upper end of the placement frame 51 is provided with a vibration groove 511 extending in a vertical direction. The support frame 52 is disposed above the placement frame 51. The lower end of the support frame 52 is provided with a connecting block 521. One end of the connecting block 521 extends into the vibration groove 511 and is connected and fixed to the inner wall of the bottom end of the vibration groove 511 through an elastic element 53. The discharge pipe 6 is assembled at the bottom end of the reaction chamber 11 and communicates with the reaction chamber 11. By setting the elastic element 53, the entire device can vibrate continuously on the placement frame 51, so that the gas film of the bubbles when carbon dioxide gas is introduced into the white mud slurry will break rapidly, further improving the reaction rate of the white mud slurry inside.

[0066] Please see Figure 6 The gas distributor 2 has multiple arc-shaped grooves 21 spaced apart along its circumference on its outer wall. The circumferentially distributed arc-shaped grooves 21 on the outside of the gas distributor 2 make the stirring effect of the white mud slurry better when the gas distributor 2 rotates.

[0067] The second objective of this invention is to provide a method for separating and processing white mud.

[0068] The technical solution is as follows:

[0069] Please see Figure 7 A method for separating and treating white mud, using a white mud separation and treatment device to treat white mud, includes the following steps:

[0070] S1: The white mud is transported to the dispersion tank, diluted with process water to a slurry with a solid content of 30%-35%, and impurities and lime particles are preliminarily screened out by a vibrating screen to obtain white mud slurry.

[0071] S2: Use white mud separation and treatment equipment to separate carbon black from white mud slurry, add modifier to white mud slurry, and introduce carbon dioxide gas to neutralize white mud slurry to form modified white mud slurry;

[0072] S3: Pump the modified white mud slurry into the particle size equalizer and perform a second sieve to obtain the product.

[0073] The modifier is cationic starch or sodium silicate.

[0074] In this embodiment, the neutralization chemical reaction involved is as follows:

[0075] Ca(OH)2 + CO2 = CaCO3↓ + H2O;

[0076] NaOH + CO2 = NaHCO3.

[0077] When the modifier is sodium silicate, the carbon dioxide gas introduced into the white mud slurry dissolves in water to form carbonic acid. Carbonic acid is more acidic than silicic acid, and thus carbonic acid reacts with sodium silicate to produce sodium carbonate and silicic acid.

[0078] The chemical reaction that produces silicon dioxide is as follows:

[0079] Na2SiO3 + CO2+ H2O = Na2CO3 + H2SiO3↓

[0080] The silicic acid produced by the reaction is a very unstable weak acid with extremely low solubility in water. It will immediately precipitate out in the form of a colloidal precipitate, namely hydrated silicon dioxide.

[0081] When using the above process, firstly, white mud is added to a dispersion tank and diluted with process water to prepare a white mud slurry with a solid content of 32%.

[0082] The white mud slurry is pumped into the separation chamber 13 from the feed inlet 131 at a tangential velocity of 1.0 m / s. Simultaneously, industrial waste gas containing carbon dioxide is introduced into the air inlet pipe 321 as a neutralizing gas, and the total flow rate into the reactor 1 is controlled at 50 m³ / h. The kinetic energy of the gas drives the gas distributor 2 to rotate at a speed of approximately 60 rpm, stirring the slurry in the reaction chamber 11. The temperature inside the entire reactor 1 is controlled at approximately 60°C through external jacket water cooling.

[0083] In this embodiment, the drive motor 144 drives the drive gear 1441 to rotate, thereby adjusting the height of the exhaust pipe 142 so that its lower end is located about 50mm above the narrowest part of the throat passage 12.

[0084] Under these process parameters, the equipment operates stably. Tests show that the carbon black content in the gas discharged from the exhaust pipe assembly 14 is significantly enriched, and the carbon black removal rate in the final white mud product can reach more than 95%. At the same time, the pH value of the modified white mud slurry discharged from the discharge pipe 6 is stable at around 7.5, and the white mud neutralization rate can reach 98%, achieving the expected technical effect.

[0085] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A white mud separation treatment apparatus for separating impurities in separated and purified white mud, characterized by, The utility model relates to a reaction kettle, which comprises a reaction kettle (1), the inside of the reaction kettle (1) is sequentially provided with reaction chamber (11) from bottom to top respectively, throat channel (12) and separation chamber (13), the inside of separation chamber (13) is equipped with the exhaust pipe assembly (14) with throat channel (12) same axis, the exhaust pipe assembly (14) is configured to be retractable, to adjust the height of lower end in vertical direction, one side of separation chamber (13) is equipped with feed inlet (131), and the feed inlet (131) is tangent to separation chamber (13) and communicates, the bottom end inner wall of reaction chamber (11) is equipped with gas distributor (2), the lower side of gas distributor (2) is equipped with the gas inlet assembly (3) that can supply neutralization gas to flow, one end of gas inlet assembly (3) is connected with pumping equipment, the other end is connected with gas distributor (2), the inside of gas inlet assembly (3) is equipped with drive fan blade (31), drive fan blade (31) is designed to rotate under the push of neutralization gas, to consume the kinetic energy of neutralization gas while driving gas distributor (2) to rotate in the inside of reaction chamber (11). The reaction kettle (1) is a sandglass-shaped container member, the reaction chamber (11), the throat channel (12) and the separation chamber (13) are communicated with each other, the inner wall of the reaction chamber (11) is designed to compress the neutralization gas, and a set contraction ratio is arranged between the reaction chamber (11) and the throat channel (12) to accelerate the flow rate of the neutralization gas when entering the throat channel (12), so that the flow rate of the neutralization gas when entering the throat channel (12) is greater than the suspension velocity of the carbon black and less than the suspension velocity of the calcium carbonate particles.

2. The white mud separation and treatment device according to claim 1, characterized in that, The exhaust pipe assembly (14) comprises: a fixed cylinder (141) which is an inverted circular truncated cone member and is rotatably assembled on the upper end of the separation chamber (13), a vertically extending threaded channel is arranged in the middle of the fixed cylinder (141); an exhaust pipe (142) which is threadedly connected in the threaded channel, one end of the exhaust pipe (142) penetrates through the fixed cylinder (141) and is slidably connected with the reaction kettle (1) through a connecting piece (143), and the other end of the exhaust pipe (142) extends to the throat channel (12); a tooth ring (1411) is arranged on the outer top end of the fixed cylinder (141), a driving motor (144) is fixedly assembled on the upper end of the reaction kettle (1), a driving gear (1441) is arranged on the driving shaft of the driving motor (144), and the driving gear (1441) is engaged with the tooth ring (1411).

3. A white mud separation and treatment apparatus according to claim 2, characterized in that, The connecting piece (143) comprises: a connecting rod (1431) which is fixedly assembled on the outer wall of the reaction kettle (1); a slip ring (1432) which is connected and fixed with the other end of the connecting rod (1431), the slip ring (1432) is sleeved on the outside of the exhaust pipe (142) and is slidably connected with the exhaust pipe (142).

4. The white mud separation and treatment device according to claim 1, characterized in that: Further comprising a shaping ring assembly (4), the shaping ring assembly (4) comprising at least two fixed rings (41), the at least two fixed rings (41) being arranged on the inner wall of the throat passage (12) in the length direction of the throat passage (12).

5. The white mud separation and treatment apparatus according to claim 1, characterized in that, The air inlet assembly (3) comprises: An air inlet cavity (32) is internally rotatably connected with a rotating column (33), one end of the rotating column (33) is externally arranged with the driving fan blades (31) in the circumferential direction of the rotating column (33); One side of the air inlet cavity (32) is provided with an air inlet pipe (321), and the air inlet pipe (321) is connected with a gas pumping device; One end of the air inlet cavity (32) is in communication with the gas distributor (2), and the other end of the rotating column (33) penetrates through the air inlet cavity (32) and is fixedly connected with the gas distributor (2).

6. The white mud separation and treatment apparatus according to claim 1, characterized in that, Further comprising a support frame assembly (5) and a discharge pipe (6), the support frame assembly (5) comprising: A placement frame (51) is provided with a vibration groove (511) extending in the vertical direction at the upper end of the placement frame (51); A support frame (52) is arranged above the placement frame (51), and the lower end of the support frame (52) is provided with a connecting block (521), one end of the connecting block (521) extends into the vibration groove (511), and the vibration groove (511) is fixedly connected with the inner wall at the bottom end of the vibration groove (511) through an elastic element (53); The discharge pipe (6) is assembled at the bottom end of the reaction chamber (11) and is in communication with the reaction chamber (11).

7. A white mud separation and treatment apparatus according to claim 1, characterized in that: A plurality of arc-shaped grooves (21) are arranged on the outer wall of the gas distributor (2) in the circumferential direction of the gas distributor (2).

8. A white mud separation treatment method characterized by: A white mud separation treatment device according to any one of claims 1-7 is used to treat white mud, comprising the following steps: S1: white mud is transported to a dispersion tank, process water is added to dilute the white mud to a slurry with a solid content of 30%-35%, and impurities and lime particles are preliminarily screened out through a vibrating screen to prepare a white mud slurry; S2: carbon black in the white mud slurry is separated using the white mud separation treatment device, a modifier is added to the white mud slurry, and carbon dioxide gas is introduced to neutralize the white mud slurry to form a modified white mud slurry; S3: the modified white mud slurry is pumped into a particle size uniformizing machine and is subjected to secondary screening to obtain a product.

9. The white mud separation treatment method according to claim 8, characterized by: The modifier is cationic starch or sodium silicate.

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