A method for preparing FCC kaolin

Abstract

A method for preparing FCC kaolin is disclosed. When mixing kaolin with acid liquid, a stirring device including a flexible member is used. The stirring rods in the stirring device are arranged in a multi-layer structure. The stirring rods are rotatably arranged on a stirring main shaft in a hinged manner. A spring and a telescopic cylinder structure are provided at the hinge, so that the stirring rods in the same layer can be evenly stressed, which can balance the stirring conditions in the horizontal direction of the stirring drum. At the same time, since the flexible member structure is provided between the stirring rods in different layers, the stirring conditions in the vertical direction of the stirring drum can be balanced. At the same time, a spherical jet member is provided in the stirring rod, which can spray gas in the acid liquid to further enhance the stirring effect. Furthermore, the spherical jet member is connected to the flexible member and can adapt to the bending of the flexible member to change the jet direction, which can further enhance the stirring effect.

Description

Technical Field

[0001] The present invention relates to the field of non-metallic mineral processing, in particular to a method for preparing FCC kaolin. Background Art

[0002] Kaolin is the most commonly used filling component in semi-synthetic catalytic cracking (FCC) catalysts. In addition to serving as a catalyst matrix, it can also provide active centers and reaction products for the cracking of some macromolecules. However, since the surface area and pore volume of raw kaolin are very small, the number of active centers is very small, and the ability to crack macromolecules is limited. In this regard, many preparation methods of modified kaolin have appeared in the prior art. For example, Patent Document 1 discloses a method for modifying kaolin, in which calcined kaolin is reacted with acid, and the pores of the kaolin obtained after filtration are concentrated in the range of 50-200 angstroms. It can be used as a component of hydrocarbon conversion, especially catalytic cracking catalysts, but it only requires that the amount of acid solution used should at least be able to submerge the kaolin solid. , and its reaction time is also 4-40 hours. There is a problem that the acid solution and kaolin are not in contact or there is too much acid solution in the kaolin, which causes the modified kaolin to have local pores or is still very small. At the same time, since there is no good stirring process between the acid solution and kaolin, it will also cause the reaction time of the acid solution and kaolin to be uncontrollable, resulting in problems such as excessive reaction time and prolonged processing time. For example, Patent Document 2 discloses a modified kaolin and a preparation method thereof, which mixes kaolin raw materials and sulfuric acid aqueous solution, and then heat-treats the mixed kaolin to obtain modified kaolin. In this method, there is no detailed record of how the kaolin raw materials are specifically mixed with the sulfuric acid aqueous solution. The general kaolin The soil raw material and the sulfuric acid aqueous solution are only stirred by the stirring rod, which has the problems of long stirring time, uneven stirring, and large torque load required for the stirring motor; for example, Patent Document 3 discloses a catalytic cracking catalyst preparation process, which mainly relates to a raw material stirring process in the catalytic cracking catalyst production process, and the stirring structure 9 in the stirring process includes a plurality of wavy stirring plates 92. When stirring, the material is transported to a high place by the wavy stirring plates 92, and the stirring plates 92 drive the raw material to the center line of the top of the stirring barrel 6 and then fall under the action of gravity, thereby stirring the raw material inside the stirring barrel 6 in all directions, so that the stirring and mixing effect of the raw material is better, but the stirring structure is complex and the rotating shaft is arranged horizontally. The raw material has a large lifting height difference, and is not in contact with the liquid when it is at the top of the mixing barrel 6, which is not suitable for kaolin that needs to react with acid; for the stirring device, such as patent document 4, it discloses a self-rotating ventilation stirring device, which is composed of two groups of stirring mechanisms consisting of a five-body and four rotating blades, and an exhaust hole group is provided on the rotating blade. Therefore, by introducing pressurized gas into the pipe, the stirring device can be driven to stir. Although the stirring device combines ventilation stirring and mechanical stirring, the power output of the stirring device is still driven by pressurized gas, the stirring force is not large, and it can only stir the materials at the two layers of each layer. The two groups of rotating blades operate independently, and its adaptability is not strong.

[0003] [Patent Document 1] CN1057556C;

[0004] [Patent Document 2] CN104556081B;

[0005] [Patent Document 3] CN109225024B;

[0006] [Patent document 4]CN108479592B.

[0007] In summary, in the prior art, there is no process specifically for fully and evenly mixing kaolin and acid solution in the FCC kaolin preparation method, and there is no mixing device specifically for this process. In addition, the existing mixing device has a complex structure, and the operations of each rotating blade are independent of each other, without considering that the space between the two rotating blades also needs to be stirred. At the same time, if the solid-liquid ratio of each part in the entire stirring container is uneven, there will be over-stirring and under-stirring between the rotating blades. Therefore, the present invention provides an FCC kaolin preparation method that can quickly, evenly and dynamically mix kaolin and acid solution to improve the overall molding performance of modified kaolin. Summary of the Invention

[0008] In order to overcome the shortcomings of the existing FCC kaolin preparation method, the present invention provides a technical solution, a FCC kaolin preparation method, comprising the following steps:

[0009] (1) Acid preheating

[0010] According to the amount of kaolin to be prepared, the calculated acid solution is added to the mixing drum of the stirring device, the heating resistance wire is heated, and then the stirring mechanism is used to stir the acid solution so that the acid solution can be heated evenly. After the temperature of the acid solution reaches a first predetermined temperature, the stirring mechanism and the heating resistance wire are stopped.

[0011] (2) Kaolin Mixing

[0012] The kaolin is added into the mixing drum, and the stirring mechanism is started so that the stirring rod of the stirring mechanism fully stirs the kaolin, and gas is introduced into the stirring mechanism so that the gas is ejected from the exhaust hole member on the stirring rod. The flexible member connected between the stirring rods of the upper and lower layers stirs and mixes the kaolin together with the stirring rod. At the same time, the gas ejected from the exhaust hole member can form bubbles in the acid solution to further promote the mixing of the kaolin and the acid solution. The gas can also blow off the kaolin adhered to the stirring rod. The stirring mechanism stops after stirring evenly for a predetermined time.

[0013] (3) Kaolin heat treatment

[0014] The kaolin fully mixed with the acid solution is washed with water and filtered, and the filtered solid is then heat-treated to obtain FCC kaolin;

[0015] The stirring device includes a stirring drum, a stirring mechanism and a heating resistance wire, the heating resistance wire is arranged at the bottom of the stirring drum, the stirring mechanism is arranged in the middle of the stirring drum, the stirring mechanism includes a rotary drive mechanism, a stirring main shaft, a stirring rod, a flexible part and an exhaust hole part, the rotary drive mechanism is fixedly arranged at the top of the stirring drum, the lower end of the rotary drive mechanism is connected to the stirring main shaft, the stirring main shaft is hinged to several layers of stirring rods through an L-shaped mounting seat, the stirring rod is rotatably arranged on the L-shaped mounting seat through a hinge shaft, and a support spring is also arranged between the L-shaped mounting seat and the stirring rod, several flexible parts are arranged between adjacent layers of stirring rods, the exhaust hole part is arranged in the stirring rod, the L-shaped mounting seat includes a mounting base and a support rod, the hinge shaft is arranged on the mounting base, the support spring is placed on the support rod, and the support rod can support the stirring rod when the rotation angle of the stirring rod is too large, and the exhaust direction of the exhaust hole part is away from one end of the support rod.

[0016] Preferably, the exhaust hole member includes a left support plate, a right support plate, a circular opening and a spherical jet member located inside the stirring rod, the circular opening is located on the side of the stirring rod away from the support rod, the spherical jet member includes a spherical cavity, a left support shaft, a right support shaft, an upper connecting member, a lower connecting member and a jet port, the left support shaft and the right support shaft are located at the left and right ends of the spherical jet member, and are respectively rotatably arranged in the left support plate and the right support plate, the jet port is located on the front side of the spherical jet member and is accommodated in the circular opening, the upper connecting member and the lower connecting member are respectively located at the upper and lower ends of the spherical jet member, and the two ends of the flexible member are respectively connected to the upper connecting member and / or the lower connecting member.

[0017] Preferably, the upper connecting member and the lower connecting member both include a support rod and a ring member, the flexible member is a cable structure, and both ends of the cable are connected via the ring member.

[0018] Preferably, a telescopic cylinder is also provided between the support rod and the stirring rod, and each telescopic cylinder is connected through a linkage drive oil circuit, the linkage drive oil circuit includes an oil tank, an oil pump, a three-position four-way solenoid valve and an oil circuit, and the four telescopic cylinders are connected through oil circuit I, oil circuit II, oil circuit III and oil circuit IV, respectively, and are connected to the A port and B port of the three-position four-way solenoid valve through oil circuit A and oil circuit B, respectively, the T port of the three-position four-way solenoid valve is connected to the oil tank through oil circuit D, and the P port of the three-position four-way solenoid valve is connected to the oil pump through oil circuit C and then to the oil tank.

[0019] Preferably, before step (2) of mixing the kaolin, the method further includes the step of debugging the stirring mechanism: controlling the three-position four-way solenoid valve to be in the right position, and filling the telescopic cylinder with liquid through the oil pump, and the degree of filling is such that when the stirring main shaft drives the stirring rod to rotate, when the stirring rod stirs the acid solution without kaolin, its axis can also pass through the center of the stirring main shaft after extension, and then, the three-position four-way solenoid valve is located in the middle position to complete the debugging of the stirring mechanism.

[0020] Preferably, when the four telescopic cylinders are to perform a linkage action, the three-position four-way solenoid valve is located in the middle position. At this time, the rodless chambers of the four telescopic cylinders are connected through the oil circuit structure; when the telescopic cylinder needs to be replenished with fluid, the three-position four-way solenoid valve is located in the right position, and the oil pump replenishes the oil into the telescopic cylinder; when the telescopic cylinder needs to be drained, the three-position four-way solenoid valve is located in the left position for draining.

[0021] Preferably, the stirring rods are arranged in three layers, with four stirring rods in each layer, and the stirring rods between two adjacent layers are connected by three flexible parts.

[0022] Preferably, the number of the exhaust hole members on each stirring rod is three and they are evenly distributed on the stirring rod.

[0023] Preferably, each of the spherical cavities is connected to an air pump for pumping gas.

[0024] Preferably, a groove structure for the upper connecting member and the lower connecting member to extend is provided on the stirring rod, and the long side of the groove structure is perpendicular to the axial direction of the left support shaft or the right support shaft.

[0025] The beneficial effects of the present invention are:

[0026] 1) The FCC kaolin preparation method of the present invention uses an acid solution to react with kaolin, and in order to ensure that the kaolin can fully and evenly contact and react with the acid solution, a stirring device including a multi-layer stirring mechanism is introduced in the stirring process. The stirring rods on each stirring mechanism are swingable, and the stirring rods between different layers are connected by flexible parts, so that the movements of the stirring mechanisms of each layer are linked. At the same time, the flexible parts between the layers stir the space between the stirring mechanisms. In this way, the entire stirring barrel is stirred, there is no dead angle problem, the stirring progress is accelerated, and the kaolin particles can fully and evenly contact and react with the acid solution, laying a solid foundation for the quality of the subsequently formed modified kaolin;

[0027] 2) Furthermore, in the stirring process of the FCC kaolin preparation method of the present invention, considering that when a stirring rod is used to mix kaolin and acid solution, kaolin will stick to the stirring rod, and the stirring rod can only stir the liquid by mechanical stirring, and its efficiency will be relatively low, a plurality of exhaust hole groups are provided on the stirring rod, and the air blown out from the exhaust hole groups prevents the kaolin from sticking to the stirring rod. At the same time, the blown air will form a stirring driving force in the liquid, and can also enable the kaolin to fully react with the acid solution in the liquid. At the same time, the plurality of exhaust hole groups are arranged in front of the rotation direction of the stirring rod. When the stirring rod is subjected to the resistance of the kaolin that is not uniformly stirred, the agglomerated kaolin can be blown away to form kaolin particles that fully react with the acid solution, thereby reducing the resistance of the stirring rod and adjusting the position of the stirring rod;

[0028] 3) Furthermore, in the stirring process of the FCC kaolin preparation method of the present invention, since the stirring rods of each layer are connected by flexible members, the kaolin will be deposited at the bottom of the mixing drum. The resistance of the stirring rods at the bottom of the mixing drum will be greater than that at the top. At this time, the flexible members will transfer the greater resistance to the stirring rods above, so that the force on the stirring device as a whole will be more uniform, so that the kaolin in the mixing drum can be stirred evenly without dead corners, and the deposited kaolin will be converted into stirring force for the stirring rods.

[0029] 4) Furthermore, the flexible member rotates into a cable structure, and the cable is made of polyacrylonitrile fiber, which has good acid and oxidant resistance and poor hygroscopicity. When the polyacrylonitrile fiber flexible member is used for stirring, since it is immersed in acid, a lot of acid will be absorbed on the surface of the cable. After the cable touches the kaolin, due to its poor hygroscopicity, the acid will be transferred to the kaolin. The use of the cable can not only achieve physical stirring of the kaolin agglomerates, but also transfer the acid to the kaolin through contact, thereby further making the reaction between the kaolin and the acid more complete;

[0030] 5) Furthermore, the stirring rod is hinged to the stirring main shaft through an articulated shaft, and the stirring rod and the stirring main shaft are connected by a spring and a telescopic cylinder. At the same time, multiple telescopic cylinders are connected by a linkage drive oil circuit, so that the stirring rod and the stirring main shaft can be movably connected, and the stirring rod with a larger local force on the same layer is transferred to other stirring rods, so that the force of the entire stirring rod can be more balanced as a whole, and the required motor driving torque can be reduced accordingly, reducing the consumption load of the motor and improving the working environment of the motor;

[0031] 6) Furthermore, the flexible member between the two layers of stirring rods is connected to the spherical jet member, which is rotatably arranged in the stirring rod through the left support shaft and the right support shaft. When the flexible member bends due to touching the kaolin during stirring, the spherical jet member is driven to rotate, so that the angle of the gas ejected is deflected. At this time, the ejected gas can play the role of blowing away the kaolin lumps, and at the same time, it can also make the kaolin rise or sink in the acid solution, so that it can be located at the layer where the stirring rod is located, and the kaolin can be fully stirred, further shortening the stirring time and improving the stirring efficiency.

[0032] 7) Furthermore, in the hinged structure between the stirring rod and the L-shaped mounting seat, a support spring is also arranged between them. The support spring causes the stirring rod to swing back and forth during stirring, and the swinging action is transmitted to the flexible part, so that the flexible part is always in a shaking state. The shaking state makes the flexible part have a better stirring effect on kaolin, which can further enhance the stirring effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a flow chart for preparing FCC kaolin according to the present invention;

[0034] Figure 2 Schematic diagram of the stirring device structure;

[0035] Figure 3 for Figure 2 AA view;

[0036] Figure 4 for Figure 3 Enlarged view of B;

[0037] Figure 5 It is a front view of the spherical air-injection member 17;

[0038] Figure 6 It is the linkage drive oil circuit.

[0039] Description of labels

[0040] 1. Stirring device; 2. Stirring drum; 3. Stirring mechanism; 4. Rotary drive mechanism; 5. Stirring spindle; 6. Stirring rod; 7. Exhaust hole; 8. Flexible member; 9. L-shaped mounting seat; 10. Articulated shaft; 11. Mounting base; 12. Support member; 13. Support spring; 14. Left support plate; 15. Right support plate; 16. Circular opening; 17. Spherical jet member; 18. Spherical cavity; 19. Left support shaft; 20. Right support Shaft; 21. Upper connecting piece; 22. Lower connecting piece; 23. Support rod; 24. Ring member; 25. Telescopic cylinder; 26. Linkage drive oil circuit; 27. Oil tank; 28. Oil pump; 29. ​​Three-position four-way solenoid valve; 30. Oil circuit A; 31. Oil circuit B; 32. Oil circuit C; 33. Oil circuit D; 34. Oil circuit I; 35. Oil circuit II; 36. Oil circuit III; 37. Oil circuit IV; 38. Jet nozzle; 39. Heating resistor wire. DETAILED DESCRIPTION

[0041] The present invention is further described below with reference to the embodiments, but the present invention is not limited in any way. Any changes or substitutions made based on the teachings of the present invention fall within the scope of protection of the present invention.

[0042] A method for preparing FCC kaolin, such as Figure 1 As shown, the following steps are included:

[0043] (1) Acid preheating

[0044] According to the amount of kaolin to be prepared, the calculated acid solution is added to the mixing drum 2 of the stirring device 1, and the heating resistance wire 39 is used to heat the acid solution. Then, the stirring mechanism 3 is used to stir the acid solution so that the acid solution can be heated evenly. After the temperature of the acid solution reaches the first predetermined temperature, the stirring mechanism 3 and the heating resistance wire 39 are stopped.

[0045] (2) Kaolin Mixing

[0046] The kaolin is added to the mixing drum 2, and the stirring mechanism 3 is started so that the stirring rod 6 of the stirring mechanism 3 fully stirs the kaolin. Gas is introduced into the stirring mechanism 3 so that the gas is ejected from the exhaust hole 7 on the stirring rod 6. The flexible member 8 connected between the stirring rods 6 of the upper and lower layers stirs and mixes the kaolin together with the stirring rod 6. At the same time, the gas ejected from the exhaust hole 7 can form bubbles in the acid solution to further promote the mixing of the kaolin and the acid solution. The gas can also blow off the kaolin adhered to the stirring rod 6. The stirring mechanism 3 stops after stirring evenly for a predetermined time.

[0047] (3) Kaolin heat treatment

[0048] The kaolin fully mixed with the acid solution is washed with water and filtered, and then the filtered solid is heat-treated to obtain FCC kaolin.

[0049] like Figure 2-3 As shown, the stirring device 1 includes a stirring drum 2, a stirring mechanism 3 and a heating resistance wire 39, the heating resistance wire 39 is arranged at the bottom of the stirring drum 2, the stirring mechanism 3 is arranged in the middle of the stirring drum 2, the stirring mechanism 3 includes a rotary drive mechanism 4, a stirring main shaft 5, a stirring rod 6, a flexible member 8 and an exhaust hole member 7, the rotary drive mechanism 4 is fixedly arranged on the top of the stirring drum 2, the lower end of the rotary drive mechanism 4 is connected to the stirring main shaft 5, the stirring main shaft 5 is hinged to several layers of stirring rods 6 through an L-shaped mounting seat 9, and the stirring rod 6 is connected to the hinge shaft 10 The rotation is set on the L-shaped mounting seat 9, and a support spring 13 is also set between the L-shaped mounting seat 9 and the stirring rod 6. Several flexible parts 8 are set between the stirring rods 6 of adjacent layers. The exhaust hole part 7 is set in the stirring rod 6. The L-shaped mounting seat 9 includes a mounting base 11 and a support rod 12. The hinge shaft 10 is set on the mounting base 11. The support spring 13 is set on the support rod 12. The support rod 12 can support the stirring rod 6 when the rotation angle of the stirring rod is too large. The exhaust direction of the exhaust hole part 7 is away from the end of the support rod 12.

[0050] like Figure 4-5 As shown, the exhaust hole member 7 includes a left support plate 14, a right support plate 15, a circular opening 16 and a spherical jet member 17 located inside the stirring rod 6. The circular opening 16 is located on the side of the stirring rod 6 away from the support rod 12. The spherical jet member 17 includes a spherical cavity 18, a left support shaft 19, a right support shaft 20, an upper connecting member 21, a lower connecting member 22 and a jet port 38. The left support shaft 19 and the right support shaft 20 are located at the left and right ends of the spherical jet member 17 and are rotatably arranged in the left support plate 14 and the right support plate 15 respectively. The jet port 38 is located on the front side of the spherical jet member 17 and is accommodated in the circular opening 16. The upper connecting member 21 and the lower connecting member 22 are respectively located at the upper and lower ends of the spherical jet member 17. The two ends of the flexible member 8 are respectively connected to the upper connecting member 21 and / or the lower connecting member 22.

[0051] The upper connecting member 21 and the lower connecting member 22 both include a support rod 23 and a ring member 24 . The flexible member 8 is preferably a cable structure, and both ends of the cable are connected via the ring member 24 .

[0052] Preferably, the cable is made of polyacrylonitrile fibers.

[0053] Preferably, the stirring rod 6 is a hollow cylindrical structure.

[0054] Preferably, the stirring rods 6 are three layers, and each layer has four stirring rods 6. Of course, the number of stirring rod layers and the number of stirring rods can be multiple, such as greater than or equal to 2.

[0055] Preferably, if Figure 4 、 6 As shown, a telescopic cylinder 25 is provided between the support rod 12 and the stirring rod 6, and each telescopic cylinder 25 is connected through a linkage drive oil circuit 26. The linkage drive oil circuit 26 includes an oil tank 27, an oil pump 28, a three-position four-way solenoid valve 29 and an oil circuit. The four telescopic cylinders 25 are respectively connected through oil circuit I34, oil circuit II35, oil circuit III36 and oil circuit IV37, and are respectively connected to the A port and the B port of the three-position four-way solenoid valve 29 through oil circuit A30 and oil circuit B31. The T port of the three-position four-way solenoid valve 29 is connected to the oil tank 27 through oil circuit D33. The P port of the three-position four-way solenoid valve 29 is connected to the oil pump 28 through oil circuit C32 and then to the oil tank 27.

[0056] When the four telescopic cylinders 25 are to perform a linkage action, the three-position four-way solenoid valve 29 is located in the middle position. At this time, the rodless chambers of the four telescopic cylinders 25 are connected through the oil circuit structure; when the telescopic cylinders 25 need to be replenished with fluid, the three-position four-way solenoid valve is located in the right position, and the oil pump 28 replenishes oil into the telescopic cylinders 25; when the telescopic cylinders 25 need to be drained, the three-position four-way solenoid valve is located in the left position for draining.

[0057] Preferably, before the kaolin mixing step, the step of debugging the stirring mechanism is also included: controlling the three-position four-way solenoid valve 29 to be in the right position, and filling the telescopic cylinder 25 with liquid through the oil pump 28. The filling degree is such that when the stirring spindle drives the stirring rod 6 to rotate, when the stirring rod stirs the acid solution without kaolin, its axis can also pass through the center of the stirring spindle 5 after extension. Then, the three-position four-way solenoid valve 29 is located in the middle position to complete the debugging of the stirring mechanism.

[0058] Preferably, the number of the exhaust hole members 7 on each stirring rod 6 is three, and they are evenly distributed on the stirring rod 6 .

[0059] Preferably, the spherical cavities 18 are all connected to an air pump, which is used to pump in gas. This is not the focus here and is not reflected in the device, so it will not be described in detail here.

[0060] Preferably, a groove-shaped structure for the upper connecting member 21 and the lower connecting member 22 to extend is provided on the stirring rod 6 , and the long side of the groove-shaped structure is perpendicular to the axial direction of the left support shaft 19 .

[0061] Preferably, the acid is hydrochloric acid, nitric acid or sulfuric acid.

[0062] Preferably, the acid solution is a sulfuric acid aqueous solution with a concentration of 70-98 wt %, and the amount of the acid solution is sufficient to completely soak the kaolin, preferably in a weight ratio of 1:1.

[0063] Preferably, the first predetermined temperature is 100-300° C.; the predetermined time is 10 minutes; the heat treatment temperature is 80-100° C., and the heat treatment time is preferably 1-15 hours.

[0064] Preferably, the rotation drive mechanism 4 is a motor.

[0065] Preferably, the air jet 38 extends out of the circular opening 16 , and the diameter of the circular opening 16 is larger than that of the air jet 38 .

[0066] Preferably, considering that kaolin will be deposited at the bottom of the mixing drum 2 when it is stirred, the resistance encountered by the stirring rod 6 at the bottom will become greater, so the spring force will be relatively large. In order to avoid the deformation of the spring affecting the stirring of kaolin by the stirring rod 6, the elastic coefficient of the support spring 13 connected to the stirring rod 6 at the bottom layer is the largest, and from bottom to top, the elastic coefficient of the support spring 13 at each layer of stirring rod 6 becomes smaller.

[0067] The present invention provides an FCC kaolin preparation method, which first heats the acid solution in the mixing drum, and then stirs the acid solution by stirring the stirring mechanism so that the temperature can be uniformly increased. After the temperature of the acid solution reaches a predetermined value, the heating and stirring of the stirring mechanism are stopped, and then the kaolin raw material is added, and the motor 4 is driven to rotate the stirring spindle 5, driving the stirring rods 6 of each layer to stir. In the initial state, the three-position four-way solenoid valve 29 is located in the right position, and the telescopic cylinders 25 are filled with liquid. When the stirring spindle drives the stirring rods 6 to rotate again, when the stirring rods stir the acid solution without kaolin, their axes can also pass through the center of the stirring spindle 5 after extension. Then, the three-position four-way solenoid valve 29 is located in the middle position. At this time, the telescopic cylinders 25 are synchronized and linked to each other, so that each flexible member 8 is in The kaolin material is then added into the tensioned state, and the motor 4 is started. At this time, the stirring rod 6 stirs the kaolin, and at the same time, the air pump is used to introduce gas. When the stirring rod 6 stirs, an air flow is generated in front of the stirring rod in the direction of rotation, which can further disperse the kaolin lumps. At the same time, the flexible member 8 between adjacent layers can also stir the kaolin. When the flexible member 8 encounters the kaolin lumps, it is subjected to a greater force and then bends. The bent flexible member 8 will drive the spherical cavity 18 to rotate, thereby changing the rotation angle of the jet port 38. The jet ports 38 in the stirring rods at the top and bottom layers will tilt the jet downward and upward respectively, which will cause the kaolin to move toward the layer where the stirring rod is located, so that the stirring rod can further stir the kaolin. At the same time, the setting of the support spring 13 makes the stirring rod 6 always in a back-and-forth vibrating state, and the back-and-forth vibrating stirring rod 6 makes the flexible member 8 always in a shaking state, which can further enhance the mixing effect of the kaolin. Compared with the ordinary stirring device, it can achieve a good stirring effect, so that the performance of the obtained kaolin is the same in all places, and the difference between the kaolins will not be too great, which can further improve the quality of FCC kaolin.

[0068] In summary, in a method for preparing FCC kaolin of the present invention, a stirring device including a flexible part is used when mixing kaolin with acid liquid, and the stirring rods in the stirring device are arranged in a multi-layer structure, and the stirring rods are rotatably arranged on the stirring main shaft in a hinged manner, and a spring and a telescopic cylinder structure are provided at the hinge, so that the stirring rods on the same layer can be uniformly stressed, which can balance the stirring conditions in the horizontal direction of the stirring barrel. At the same time, since the flexible part structure is provided between the stirring rods between different layers, it can balance the stirring conditions in the vertical direction of the stirring barrel. At the same time, a spherical jet part is provided in the stirring rod, which can spray gas in the acid liquid to further enhance the stirring effect. Furthermore, the spherical jet part is connected to the flexible part, which can adapt to the bending of the flexible part and change the jet direction, which can further enhance the stirring effect.

Claims

1. A stirring device (1) for preparing FCC kaolin, characterized in that: The stirring device (1) comprises a stirring drum (2), a stirring mechanism (3) and a heating resistance wire (39), wherein the heating resistance wire (39) is arranged at the bottom of the stirring drum (2), the stirring mechanism (3) is arranged at the middle of the stirring drum (2), the stirring mechanism (3) comprises a rotary drive mechanism (4), a stirring main shaft (5), a stirring rod (6), a flexible member (8) and an exhaust hole member (7), the rotary drive mechanism (4) is fixedly arranged at the top of the stirring drum (2), the lower end of the rotary drive mechanism (4) is connected to the stirring main shaft (5), and the stirring main shaft (5) is connected to the stirring main shaft (5) by an L-shaped The mounting seat (9) is hinged to a plurality of layers of stirring rods (6), and the stirring rods (6) are rotatably arranged on the L-shaped mounting seat (9) through a hinge shaft (10). A support spring (13) is further arranged between the L-shaped mounting seat (9) and the stirring rods (6). A plurality of flexible members (8) are arranged between the stirring rods (6) of adjacent layers. An exhaust hole member (7) is arranged in the stirring rod (6). The L-shaped mounting seat (9) includes a mounting base (11) and a support rod (12). The hinge shaft (10) is arranged on the mounting base (11), and the support spring (13) is arranged on the support rod (12). The support rod (12) can support the stirring rod (6) when the stirring rod rotates at an excessively large angle, and the exhaust direction of the exhaust hole member (7) is toward one end away from the support rod (12); the exhaust hole member (7) comprises a left support plate (14) located inside the stirring rod (6), a right support plate (15), a circular opening (16) and a spherical air-jet member (17), the circular opening (16) being located on a side of the stirring rod (6) away from the support rod (12), and the spherical air-jet member (17) comprising a spherical cavity (18), a left support shaft (19), a right support shaft (20), an upper connecting member (11) and a lower connecting member (12). The spherical jet component (17) is provided with a spherical jet component (21), a lower connecting component (22) and an air jet port (38), a left supporting shaft (19) and a right supporting shaft (20) are located at the left and right ends of the spherical jet component (17), and are rotatably arranged in the left supporting plate (14) and the right supporting plate (15), respectively, the air jet port (38) is located at the front side of the spherical jet component (17) and is accommodated in the circular opening (16), the upper connecting component (21) and the lower connecting component (22) are respectively located at the upper end and the lower end of the spherical jet component (17), and the two ends of the flexible component (8) are respectively connected to the upper connecting component (21) and the lower connecting component (22); The plurality of flexible members (8) are cables made of polyacrylonitrile fibers.

2. The stirring device (1) for preparing FCC kaolin according to claim 1, characterized in that: The upper connecting member (21) and the lower connecting member (22) both include a support rod (23) and a ring member (24), and the two ends of the cable are connected via the ring member (24).

3. The stirring device (1) for preparing FCC kaolin according to claim 2, characterized in that: A telescopic cylinder (25) is further provided between the support rod (12) and the stirring rod (6), and each telescopic cylinder (25) is connected via a linkage drive oil circuit (26). The linkage drive oil circuit (26) includes an oil tank (27), an oil pump (28), a three-position four-way solenoid valve (29) and an oil circuit. The four telescopic cylinders (25) are respectively connected via oil circuit I (34), oil circuit II (35), oil circuit III (36) and oil circuit IV (37), and are respectively connected to the A port and the B port of the three-position four-way solenoid valve (29) via oil circuit A (30) and oil circuit B (31). The T port of the three-position four-way solenoid valve (29) is connected to the oil tank (27) via oil circuit D (33). The P port of the three-position four-way solenoid valve (29) is connected to the oil pump (28) via oil circuit C (32) and then to the oil tank (27).

4. The stirring device (1) for preparing FCC kaolin according to claim 3, characterized in that: When the four telescopic cylinders (25) are to be linked, the three-position four-way solenoid valve (29) is located in the middle position, and at this time, the rodless chambers of the four telescopic cylinders (25) are connected through the oil circuit structure; when the telescopic cylinders (25) need to be replenished with fluid, the three-position four-way solenoid valve is located in the right position, and the oil pump (28) replenishes the oil into the telescopic cylinders (25); when the telescopic cylinders (25) need to be drained, the three-position four-way solenoid valve is located in the left position for draining.

5. The stirring device (1) for preparing FCC kaolin according to claim 1, characterized in that: The stirring rods (6) are arranged in three layers, with four stirring rods (6) on each layer. The stirring rods (6) between two adjacent layers are connected via three flexible members (8).

6. The stirring device (1) for preparing FCC kaolin according to claim 1, characterized in that: The resistance to the stirring rod (6) at the bottom will become greater, so the force on the spring will be greater. In order to avoid the deformation of the spring affecting the stirring of kaolin by the stirring rod (6), the elastic coefficient of the support spring (13) connected to the stirring rod (6) at the bottom layer is the largest. From bottom to top, the elastic coefficients of the support springs (13) at each layer of the stirring rod (6) become smaller.

7. The stirring device (1) for preparing FCC kaolin according to claim 1, characterized in that: The spherical cavities (18) are all connected to an air pump, and the air pump is used to pump in gas.

8. The stirring device (1) for preparing FCC kaolin according to claim 1, characterized in that: A groove structure for the upper connecting piece (21) and the lower connecting piece (22) to extend is provided on the stirring rod (6), and the long side of the groove structure is perpendicular to the axial direction of the left supporting shaft (19) or the right supporting shaft (20).

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