Continuous recovery device for titanium dioxide in catalyst

Abstract

The utility model relates to the technical field of titanium dioxide recovery, in particular to a continuous recovery device for titanium dioxide in a catalyst, which comprises a support frame and a protective shell fixedly arranged on the support frame, and a recovery grinding box is rotatably arranged in the protective shell. The transmission shaft rotates to drive the filter plate to shake perpendicular to the ground instead of a vibration motor, so that the stability of the device during use can be improved, the loss of electric energy during use of the vibration motor can be reduced, and the energy-saving and environment-friendly effects are achieved; through rotation of the spiral blades, the catalyst can be conveyed into the recycling and grinding box at a constant speed to be ground, and the catalyst can be prevented from splashing out of the recycling and grinding box during grinding; and the grinding roller rotating in the reverse direction of the recovery grinding box can conduct rolling friction refining on the catalyst with large particles, in this way, the upward extrusion force generated when the grinding roller grinds the catalyst can be reduced, and therefore the grinding roller is not prone to deformation in the using process.

Description

Technical Field

[0001] The utility model relates to the technical field of titanium dioxide recovery, in particular to a continuous recovery device for titanium dioxide in a catalyst. Background Art

[0002] In order to control the emission of nitrogen oxides (NOx), the selective catalytic reduction (SCR) flue gas denitrification technology has been widely used in coal-fired power plants in my country, and its core is the catalyst. At present, the most widely used denitrification catalyst in coal-fired power plants is the V2O5-WO3 / TiO2 system. Since the catalyst cannot be partially restored after deactivation, a large amount of waste catalyst is generated every year. However, vanadium-titanium waste catalysts have been included in the management of hazardous wastes by the state, and they are mainly composed of valuable metal oxides such as V, W and Ti. Therefore, it is of great significance to study the relevant technologies for harmless treatment and resource utilization of waste catalysts.

[0003] The main research contents and conclusions are as follows:

[0004] 1. The enhanced mechanical ball milling method was used to promote the dispersion of waste SCR catalyst carrier particles, and the effects of process conditions such as dispersant type, solution pH, dispersant mass concentration and ball milling time on the particle size of recycled waste catalyst carrier particles were systematically investigated. The experimental results show that adding sodium dodecyl sulfate or polyoxyethylene lauryl ether during ball milling can enhance particle dispersion. The optimal process conditions for enhanced ball milling dispersion are polyoxyethylene lauryl ether as dispersant, solution pH of 6.7, dispersant mass concentration of 10g / L, and ball milling time of 2h. This process can reduce the particle size of waste catalyst particles from 32.50μm to 2.19μm, improving the quality of recycled carrier TiO2 for reuse.

[0005] 2. The waste SCR catalyst was washed by NH4F / H2SO4 method to remove impurities mainly composed of SiO2 and alkali metals in the waste agent, and a recovery carrier mainly composed of Ti and W was obtained, which met the purity requirements of industrial titanium tungsten powder. The resynthesized catalyst was prepared using the recovered carrier, and the differences in its physical and chemical properties and catalytic activity with the deactivated catalyst and the fresh catalyst were studied. The experimental results show that compared with the deactivated catalyst, the specific surface area and V4+ / V5+ ratio of the resynthesized catalyst are increased, and the reduction performance of vanadium is restored. At the same time, the activity of the resynthesized catalyst is greatly improved compared with the deactivated catalyst, and it shows good N2 selectivity.

[0006] 3. The phosphorylated TiO2 carrier was obtained by impregnation method, and then V2O5-WO3 / TiO2 catalysts with different P contents were prepared. The experimental results show that the addition of P can improve the denitrification activity of V2O5-WO3 / TiO2 catalysts, especially the catalytic activity in the low temperature section. And when the P2O5 content is 2.0%, the catalyst activity is best improved. The results of NH3 temperature programmed desorption (NH3-TPD) show that the addition of P can increase the number of weakly acidic sites on the catalyst surface.

[0007] At present, when dispersing the waste SCR catalyst carrier particles, the waste SCR catalyst carrier particles are usually directly put into a ball mill for ball milling. In addition, some ball mills are equipped with screens and vibration motors to screen out impurities larger than the diameter of the waste SCR catalyst carrier particles. The amplitude of the screen provided by the vibration motor will not only increase the energy consumption of the ball mill, but also easily cause the ball mill to vibrate slightly when working. The long-term vibration of the ball mill will increase the friction between the ball mill and the ground, thereby reducing the service life of the equipment. Utility Model Content

[0008] The utility model aims to provide a continuous recovery device for titanium dioxide in a catalyst to solve the problems raised in the above-mentioned background technology.

[0009] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0010] A continuous recovery device for titanium dioxide in a catalyst, comprising a support frame and a protective shell fixedly arranged on the support frame, a recovery grinding box rotatably arranged in the protective shell, and the recovery grinding box and the protective shell form a recovery grinding mechanism;

[0011] The recovery and grinding mechanism cooperates with the feeding component through the conveying component, and the feeding component is used to screen the recovered catalyst according to the particle size and send it to the recovery and grinding mechanism through the conveying component;

[0012] The recovery and grinding mechanism is used to crush the catalyst after being screened by the feeding component, wherein the recovery and grinding mechanism, the feeding component, and the conveying component cooperate with each other through mechanical transmission.

[0013] A continuous recovery device for titanium dioxide in a catalyst as described above: the feeding assembly includes a transmission shaft rotatably arranged in the conveying assembly, a protrusion fixed on the circumferential surface of the transmission shaft, a wheel matched with the protrusion, a connecting rod rotatably connected to the wheel at the bottom, and a filter plate fixed above the connecting rod; the conveying assembly is also connected to a feed pipe, a feed hopper is fixedly arranged on the feed pipe, and the filter plate is slidably matched with the feed hopper.

[0014] A continuous recovery device for titanium dioxide in a catalyst as described above: the conveying component includes a feed pipe fixedly mounted on a protective shell, the transmission shaft is located in the feed pipe, a reducer is fixedly mounted on the end of the feed pipe away from the protective shell, one end of the transmission shaft is connected to the reducer, and the other end of the transmission shaft is connected to a recovery grinding box, a servo motor is fixedly mounted on the reducer, and spiral blades are fixedly mounted on the outer wall of the transmission shaft.

[0015] A continuous recovery device for titanium dioxide in a catalyst as described above: the grinding mechanism includes a grinding roller arranged in a recovery grinding box, the grinding roller is rotatably connected to the protective shell, and the grinding roller is mechanically matched with the transmission shaft through a transmission assembly.

[0016] A continuous recovery device for titanium dioxide in a catalyst as described above: two limit plates are fixedly arranged in the feed hopper, the filter plate is located between the two limit plates, a spring is fixedly arranged on the filter plate, and one end of the spring away from the filter plate is fixedly connected to a limit plate.

[0017] In the above-mentioned continuous recovery device of titanium dioxide in a catalyst, the transmission assembly comprises a first transmission gear fixedly arranged on the transmission shaft and a second transmission gear fixedly arranged on the grinding roller, and the first transmission gear and the second transmission gear are meshed with each other.

[0018] In the above-mentioned continuous recovery device of titanium dioxide in a catalyst: a discharge pipe is fixedly arranged on the protective shell, a control box is fixedly arranged on the support frame, and the recovery grinding box is slidably connected to the protective shell via a sliding mechanism.

[0019] In the above-mentioned continuous recovery device of titanium dioxide in a catalyst, the sliding mechanism comprises a sliding rail fixedly arranged in the protective shell and a sliding ring fixedly arranged on the recovery grinding box, and the sliding ring is slidably matched with the sliding rail.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] The filter plate is driven to shake vertically on the ground by rotating the transmission shaft instead of using a vibration motor. This not only improves the stability of the device during use, but also reduces the loss of electricity when the vibration motor is in use, thereby playing a role in energy saving and environmental protection; the rotation of the spiral blades can not only transport the catalyst to the recovery grinding box for grinding at a uniform speed, but also prevent the catalyst from splashing out of the recovery grinding box during grinding; the grinding roller rotating in the opposite direction to the recovery grinding box can refine the larger particles of the catalyst by rolling friction, which can reduce the upward extrusion force of the grinding roller when grinding the catalyst, thereby preventing the grinding roller from being easily deformed during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of a continuous recovery device of titanium dioxide in a catalyst.

[0023] Figure 2 This is a partial cross-sectional view of a feed pipe of a continuous recovery device for titanium dioxide in a catalyst.

[0024] Figure 3 This is a three-dimensional diagram of the connection between the drive shaft and the rotor of a continuous recovery device for titanium dioxide in a catalyst.

[0025] Figure 4 The utility model relates to a feed hopper and a filter plate explosion head of a continuous recovery device of titanium dioxide in a catalyst.

[0026] Figure 5 This is a cross-sectional view of the protective shell of a continuous recovery device for titanium dioxide in a catalyst.

[0027] Figure 6 This is a three-dimensional diagram of the connection between the recovery grinding box and the transmission shaft of a continuous recovery device for titanium dioxide in a catalyst.

[0028] In the figure: 1. support frame; 2. recovery grinding box; 3. feed pipe; 4. reducer; 5. servo motor; 6. transmission shaft; 7. spiral blade; 8. feed pipe; 9. feed hopper; 10. limit plate; 11. filter plate; 12. spring; 13. connecting rod; 14. rotating wheel; 15. bump; 16. grinding roller; 17. second transmission gear; 18. discharge pipe; 19. control box; 20. slide rail; 21. slip ring; 22. first transmission gear. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0030] See also Figure 1 to Figure 6 As an embodiment of the utility model, it includes a support frame 1 and a protective shell fixedly arranged on the support frame 1, a recovery grinding box 2 is rotatably arranged in the protective shell, and the recovery grinding box 2 and the protective shell form a recovery grinding mechanism;

[0031] The recovery and grinding mechanism cooperates with the feeding component through the conveying component, and the feeding component is used to screen the recovered catalyst according to the particle size and send it to the recovery and grinding mechanism through the conveying component;

[0032] The recovery and grinding mechanism is used to crush the catalyst after being screened by the feeding component, wherein the recovery and grinding mechanism, the feeding component, and the conveying component cooperate with each other through mechanical transmission.

[0033] When the device is in use, the catalyst is put into the feeding component. Particles with particle sizes that meet the standards will pass through the feeding component and fall into the conveying component, while particles with particle sizes that do not meet the standards will be retained in the feeding component, thereby screening the catalyst. The catalyst that falls into the conveying component will be transported to the recovery grinding box 2 and ground by the grinding mechanism. In addition, when the conveying component is in operation, it will drive the feeding component to screen the catalyst particles and the recovery grinding mechanism to grind the catalyst.

[0034] The feeding assembly includes a transmission shaft 6 rotatably arranged in the conveying assembly, a protrusion 15 fixed on the circumferential surface of the transmission shaft 6, a wheel 14 cooperating with the protrusion 15, a connecting rod 13 rotatably connected to the wheel 14 at the bottom, and a filter plate 11 fixed above the connecting rod 13; the conveying assembly is also connected to the feed pipe 8, and a feed hopper 9 is fixedly arranged on the feed pipe 8, and the filter plate 11 is slidably matched with the feed hopper 9.

[0035] When the transmission shaft 6 rotates, the transmission shaft 6 will drive the protrusion 15 to rotate. When the protrusion 15 rotates to the rotating wheel 14, the rotating wheel 14 will press over the protrusion 15. When the rotating wheel 14 presses over the protrusion 15, the rotating wheel 14 will push the filter plate 11 through the connecting rod 13. When the rotating wheel 14 rolls on the transmission shaft 6 again, the filter plate 11 will restore its original position due to its own gravity, so that the filter plate 11 can shake vertically on the ground in this reciprocating manner.

[0036] The filter plate 11 is driven to shake vertically on the ground by rotating the transmission shaft 6 instead of using a vibration motor, which not only improves the stability of the device during use, but also reduces the loss of electric energy when the vibration motor is used, thereby playing a role in energy saving and environmental protection.

[0037] The conveying assembly includes a conveying pipe 3 fixedly arranged on the protective shell, the transmission shaft 6 is located in the conveying pipe 3, a reducer 4 is fixedly arranged at one end of the conveying pipe 3 away from the protective shell, one end of the transmission shaft 6 is connected to the reducer 4, and the other end of the transmission shaft 6 is connected to the recovery grinding box 2, a servo motor 5 is fixedly arranged on the reducer 4, and a spiral blade 7 is fixedly arranged on the outer wall of the transmission shaft 6.

[0038] When the device is used, the servo motor 5 is started, and the start of the servo motor 5 drives the transmission shaft 6 to rotate through the reducer 4. The rotation of the transmission shaft 6 drives the spiral blades 7, and the rotating spiral blades 7 transport the catalyst in the feed pipe 3 to the recovery grinding box 2.

[0039] The rotating spiral blades 7 can not only uniformly transport the catalyst to the recovery grinding box 2 for grinding, but also prevent the catalyst from splashing out of the recovery grinding box 2 during grinding.

[0040] Among them, a sieve plate is fixedly installed in the recovery grinding box 2, and the transmission shaft 6 is rotatably connected to the sieve plate. The sieve plate can screen the ground catalyst, and the side of the spiral blade 7 away from the transmission shaft 6 is in contact with the inner wall of the feed pipe 3.

[0041] The grinding mechanism includes a grinding roller 16 disposed in the recovery grinding box 2, the grinding roller 16 is rotatably connected to the protective shell, and the grinding roller 16 is mechanically matched with the transmission shaft 6 through a transmission assembly.

[0042] Two limit plates 10 are fixedly arranged in the feed hopper 9 , the filter plate 11 is located between the two limit plates 10 , a spring 12 is fixedly arranged on the filter plate 11 , and one end of the spring 12 away from the filter plate 11 is fixedly connected to one limit plate 10 .

[0043] The spring 12, the limiting plate 10 and the filter plate 11 are located on the same vertical line, and the spring 12 has the same elasticity.

[0044] The transmission assembly includes a first transmission gear 22 fixedly disposed on the transmission shaft 6 and a second transmission gear 17 fixedly disposed on the grinding roller 16 , and the first transmission gear 22 and the second transmission gear 17 are meshed with each other.

[0045] The rotating transmission shaft 6 will drive the first transmission gear 22 to rotate, and the first transmission gear 22 will drive the grinding roller 16 to rotate through the second transmission gear 17. The catalyst with a smaller diameter will pass through the gap between the recovery grinding box 2 and the grinding roller 16 for grinding, and the catalyst with a larger diameter will roll and rub between the recovery grinding box 2 and the grinding roller 16 under the reverse rotation of the grinding roller 16. As the catalyst rolls and rubs, the particle size will gradually decrease, and the decrease in the catalyst particle size will gradually approach the gap between the grinding roller 16 and the recovery grinding box 2 until the catalyst passes through the gap between the recovery grinding box 2 and the grinding roller 16 for grinding.

[0046] The grinding roller 16 rotating in the opposite direction to the recovery grinding box 2 can refine the catalyst with larger particles by rolling friction, which can reduce the upward squeezing force of the grinding roller 16 when grinding the catalyst, thereby preventing the grinding roller 16 from being easily deformed during use.

[0047] The diameter of the second transmission gear 17 is smaller than that of the grinding roller 16 , and the grinding roller 16 and the recovery grinding box 2 rotate in opposite directions.

[0048] When using the device: first start the servo motor 5, the start of the servo motor 5 drives the transmission shaft 6 to rotate through the reducer 4, the rotation of the transmission shaft 6 will drive the spiral blade 7, the protrusion 15, the first transmission gear 22, and the recovery grinding box 2 to rotate, when the protrusion 15 rotates to the rotating wheel 14, the rotating wheel 14 will press over the protrusion 15, when the rotating wheel 14 presses over the protrusion 15, the rotating wheel 14 will push the filter plate 11 through the connecting rod 13, when the rotating wheel 14 rolls on the transmission shaft 6 again, the filter plate 11 will restore its original position through the elastic potential energy of the spring 12 itself, so that the filter plate 11 can shake vertically to the ground in this reciprocating manner, and the first transmission gear 22 will drive the grinding roller 16 to rotate in the opposite direction through the second transmission gear 17 during the rotation process, and then The catalyst is placed on the filter plate 11. The shaking of the filter plate 11 vertically to the ground will screen out the impurities in the catalyst that are larger in diameter than the catalyst. The catalyst that meets the standards will fall into the feed pipe 3. The rotating spiral blades 7 will transport the catalyst in the feed pipe 3 to the recovery grinding box 2. The catalyst with a smaller diameter will pass through the gap between the recovery grinding box 2 and the grinding roller 16 for grinding. The catalyst with a larger diameter will roll and rub between the recovery grinding box 2 and the grinding roller 16 under the reverse rotation of the grinding roller 16. With the rolling friction of the catalyst, the particle size will gradually decrease. The decrease in the catalyst particle size will gradually approach the gap between the grinding roller 16 and the recovery grinding box 2 until the catalyst passes through the gap between the recovery grinding box 2 and the grinding roller 16 for grinding.

[0049] A discharge pipe 18 is fixedly provided on the protective shell, a control box 19 is fixedly provided on the support frame 1, and the recovery and grinding box 2 is slidably connected to the protective shell via a sliding mechanism.

[0050] The sliding mechanism includes a slide rail 20 fixedly arranged inside the protective shell and a slip ring 21 fixedly arranged on the recovery grinding box 2 , and the slip ring 21 is slidably connected to the slide rail 20 .

[0051] The cooperation between the slip ring 21 and the slide rail 20 plays a role in limiting the position of the recovery and grinding box 2, so that the rotation of the recovery and grinding box 2 in the protective shell can be more stable.

[0052] The above embodiments are exemplary rather than restrictive, so without departing from the spirit or basic features of the present invention, the technical solutions of the present invention that can be implemented in other specific forms are all included in the present invention.

Claims

1. A continuous recovery device for titanium dioxide in a catalyst, comprising a support frame (1) and a protective shell fixedly arranged on the support frame (1), a recovery grinding box (2) being rotatably arranged in the protective shell, and the recovery grinding box (2) and the protective shell forming a recovery grinding mechanism; It is characterized in that The recovery and grinding mechanism cooperates with the feeding component through the conveying component, and the feeding component is used to screen the recovered catalyst according to the particle size and send it to the recovery and grinding mechanism through the conveying component; The recovery and grinding mechanism is used to crush the catalyst after being screened by the feeding component, wherein the recovery and grinding mechanism, the feeding component, and the conveying component cooperate with each other through mechanical transmission.

2. The continuous recovery device for titanium dioxide in a catalyst according to claim 1, characterized in that: The feeding assembly comprises a transmission shaft (6) rotatably arranged in the conveying assembly, a protrusion (15) fixed on the circumferential surface of the transmission shaft (6), a rotating wheel (14) matched with the protrusion (15), a connecting rod (13) rotatably connected to the rotating wheel (14) at the bottom, and a filter plate (11) fixed above the connecting rod (13); the conveying assembly is also connected to a feeding pipe (8), a feeding hopper (9) is fixedly arranged on the feeding pipe (8), and the filter plate (11) is slidably matched with the feeding hopper (9).

3. The continuous recovery device for titanium dioxide in a catalyst according to claim 2, characterized in that: The conveying assembly comprises a conveying pipe (3) fixedly arranged on a protective shell, the transmission shaft (6) is located in the conveying pipe (3), a reducer (4) is fixedly arranged at one end of the conveying pipe (3) away from the protective shell, one end of the transmission shaft (6) is connected to the reducer (4), and the other end of the transmission shaft (6) is connected to a recovery grinding box (2), a servo motor (5) is fixedly arranged on the reducer (4), and a spiral blade (7) is fixedly arranged on the outer wall of the transmission shaft (6).

4. The continuous recovery device for titanium dioxide in a catalyst according to claim 1, characterized in that: The grinding mechanism comprises a grinding roller (16) arranged in a recovery grinding box (2); the grinding roller (16) is rotatably connected to the protective shell; and the grinding roller (16) is mechanically matched with a transmission shaft (6) through a transmission assembly.

5. The continuous recovery device for titanium dioxide in a catalyst according to claim 2, characterized in that: Two limit plates (10) are fixedly arranged in the feed hopper (9), the filter plate (11) is located between the two limit plates (10), a spring (12) is fixedly arranged on the filter plate (11), and one end of the spring (12) away from the filter plate (11) is fixedly connected to one of the limit plates (10).

6. The continuous recovery device for titanium dioxide in a catalyst according to claim 4, characterized in that: The transmission assembly comprises a first transmission gear (22) fixedly arranged on a transmission shaft (6) and a second transmission gear (17) fixedly arranged on a grinding roller (16); the first transmission gear (22) and the second transmission gear (17) are meshed with each other.

7. The continuous recovery device of titanium dioxide in a catalyst according to claim 1, characterized in that: A discharge pipe (18) is fixedly arranged on the protective shell, a control box (19) is fixedly arranged on the support frame (1), and the recovery grinding box (2) is slidably connected to the protective shell via a sliding mechanism.

8. The continuous recovery device of titanium dioxide in a catalyst according to claim 7, characterized in that: The sliding mechanism comprises a sliding rail (20) fixedly arranged in the protective shell and a sliding ring (21) fixedly arranged on the recycling grinding box (2), and the sliding ring (21) is in sliding cooperation with the sliding rail (20).

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