Carbon material phosphoric acid recovery process and equipment

Abstract

The application discloses a carbon material phosphoric acid recovery process and equipment, wherein the device comprises an outer cylinder, an inner cylinder, a screening cylinder, a driving mechanism and a grinding mechanism; the upper end of the outer cylinder is provided with a feeding pipe, and the lower end is provided with a discharging pipe; the inner cylinder is fixedly connected with the outer cylinder; the screening cylinder is sleeved outside the inner cylinder; the screening cylinder comprises a bottom plate, side support plates and a top plate; the bottom plate and the top plate are connected through the side support plates; screening nets are arranged between adjacent side support plates; the bottom plate is rotatably connected with the bottom of the outer cylinder; the top plate is slidably connected with the top of the outer cylinder; the driving mechanism comprises a driving motor and a driving shaft; the driving motor is installed at the upper end of the outer cylinder; the output shaft of the driving motor is connected with the driving shaft; the driving shaft penetrates through the inner cylinder; the upper end of the driving shaft is rotatably connected with the outer cylinder; the lower end of the driving shaft is fixedly connected with the screening cylinder; and the grinding mechanism grinds the material. The application can continuously recover phosphoric acid from the activated material containing phosphoric acid after activation, simultaneously screens the material on line by using the screening mechanism, combines processes, reduces cost and increases benefit, and further improves the production efficiency of products.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon material preparation, in particular to a carbon material phosphoric acid recovery process and equipment. BACKGROUND

[0002] Activated carbon is a kind of adsorptive carbon material with pore structure, which is initially applied in the fields of medicine and food, and then extended to more and more fields such as purification and recovery. The earliest record of the application of activated carbon in China is in the Ming Dynasty as a medicine to treat diarrhea and gastrointestinal diseases. After that, the large-scale preparation of activated carbon fibers has rapidly developed in the fields of industry, food, environmental protection, etc.

[0003] At present, the preparation of carbon materials mostly adopts the phosphoric acid method. The main raw materials used in the preparation process of mesoporous activated carbon by the phosphoric acid method include biomass such as wood powder, phosphoric acid and hydrochloric acid. The biomass such as wood powder is first screened to remove hard impurities in the raw materials, and then the screened wood powder is immersed in phosphoric acid. The concentration of phosphoric acid is experimentally optimized according to the specific type and resin content of wood powder. Under the condition that the type of wood powder is determined, the concentration gradient of phosphoric acid is set, and then the wood powder is fully absorbed under a certain impregnation ratio. The obtained product is sent to a rotary activation furnace by a conveying device for carbon activation. The activated material is subjected to phosphoric acid recovery, and the phosphoric acid content in the solution is reduced to below 5 Baumé. After washing with clean water, drying, crushing and packaging of the finished product are performed. However, the activated carbon material contains high-concentration phosphoric acid which needs to be recovered. During the activation process, some fine particles or carbon powder or larger clumps may be formed due to transmission friction. If these particles, carbon powder and clumps are not further treated (such as screening and grinding), the granules will have a "mud-like" appearance when added to low-concentration recovery acid to extract high-concentration recovery phosphoric acid, which seriously hinders the flow of liquid and causes great difficulty in the recovery of phosphoric acid.

[0004] In view of the above problems, the present applicant has conducted in-depth research, and thus the present application is produced. SUMMARY

[0005] The main purpose of the present application is to provide a carbon material phosphoric acid recovery process and equipment, which can effectively solve the above technical problems.

[0006] In order to achieve the above purpose, the solution of the present application is:

[0007] The application discloses a carbon material phosphoric acid recovery equipment which comprises an outer cylinder, an inner cylinder, a screening cylinder, a driving mechanism and a grinding mechanism, the upper end of the outer cylinder is provided with a feeding pipe and the lower end is provided with a discharging pipe, the upper end of the inner cylinder is fixedly connected with the outer cylinder, the screening cylinder is sleeved outside the inner cylinder, the screening cylinder comprises a bottom plate, side support plates and a top plate, the bottom plate and the top plate are connected through the side support plates, screening nets are arranged between adjacent side support plates, the bottom plate is rotationally connected with the bottom of the outer cylinder, and the top plate is slidingly connected with the top of the outer cylinder, the driving mechanism comprises a driving motor and a driving shaft, the driving motor is installed at the upper end of the outer cylinder, the output shaft of the driving motor is connected with the driving shaft, the driving shaft penetrates through the inner cylinder, the upper end of the driving shaft is rotationally connected with the outer cylinder, and the lower end of the driving shaft is fixedly connected with the screening cylinder, and the grinding mechanism is arranged in the inner cylinder and is used for grinding materials.

[0008] Further, the inner bottom end of the outer cylinder is provided with a bearing seat, the bottom plate is rotationally connected with the bearing seat, the lower end of the bearing seat is provided with a discharging pipe, the bottom plate and the bearing seat are provided with discharging holes which are in communication with the discharging pipe, and a plugging plate is arranged in the discharging pipe.

[0009] Further, the upper end of the inner cylinder is fixedly connected with the outer cylinder through a support, the lower end of the inner cylinder is provided with a guide ring, the upper surface of the bottom plate is provided with a ring groove, and the guide ring and the ring groove are matched with each other.

[0010] Further, the grinding mechanism comprises a transmission shaft, a transmission gear, a main gear, an upper grinding disc and a lower grinding disc, the upper end of the transmission shaft is rotationally connected with the outer cylinder, the lower end of the transmission shaft is rotationally connected with the inner cylinder, the transmission gear is sleeved on the transmission shaft, the top plate is provided with an inner gear ring which is in mesh with the transmission gear, the main gear is rotationally sleeved outside the driving shaft, the main gear is rotationally connected with the outer cylinder, the upper grinding disc is fixedly connected at the lower end of the main gear and is arranged above the upper opening of the inner cylinder, the lower grinding disc is fixedly connected on the driving shaft and is arranged in the upper opening of the inner cylinder, the grinding channel is formed between the upper grinding disc and the lower grinding disc, and the driving shaft is provided with a material conveying blade at the lower end of the lower grinding disc.

[0011] Further, the grinding mechanism further comprises a scattering blade which is uniformly arranged on the transmission shaft.

[0012] Further, the upper end of the top plate is provided with a guide rod, the upper side wall in the inner cylinder is provided with an annular guide groove, and the guide rod and the guide groove are matched and connected.

[0013] Further, the lower end of the plugging plate is provided with an operating rod.

[0014] Further, the lower end of the outer cylinder is provided with a supporting leg.

[0015] A preparation process based on the above equipment, comprising the following steps:

[0016] (1) Pour the activated carbon material prepared from the feeding pipe into the outer cylinder, so that the material falls into the inside of the screening cylinder, and low-concentration recovered phosphoric acid is injected;

[0017] (2) Start the driving motor, which drives the driving shaft and the screening cylinder to rotate;

[0018] (3) When the screening cylinder rotates, the inner ring gear meshes with the transmission gear, driving the transmission shaft to rotate, and the transmission shaft drives the dispersing blades to rotate to disperse and downwardly stir and convey the material;

[0019] (4) When the screening cylinder rotates, centrifugal force is generated, and fine particles, impurities and carbon powder pass through the screening net outward and fall into the outer cylinder, and are discharged through the discharge pipe for collection;

[0020] (5) The driving shaft drives the material conveying blades and the lower grinding disc to rotate, conveying the material agglomerated at the bottom of the screening cylinder upward along the inner cylinder to the upper opening of the inner cylinder;

[0021] (6) The transmission gear drives the main gear to rotate, thereby driving the upper grinding disc to rotate reversely relative to the lower grinding disc, and when the material is conveyed to the upper opening of the inner cylinder, the material falls into the screening cylinder again through the grinding channel, and the material with a larger size is ground and broken when passing through the grinding channel;

[0022] (7) Repeat steps (4)-(6) to fully discharge the impurities in the screening cylinder which seriously hinder the flow of the recovered phosphoric acid, and to cyclically grind the material, so that the carbon material can be screened to meet the size requirement during the recovery process;

[0023] (8) After the recovery and screening are completed, clean water is introduced to recover the residual phosphoric acid in the screened material again, and the carbon material is rinsed;

[0024] (9) Pull down the operating rod to take out the blocking plate, slowly drive the screening cylinder to rotate, so that the rinsed material in the screening cylinder falls into the discharge pipe through the discharge hole, and is discharged through the discharge pipe;

[0025] (10) Collect and dry the carbon material.

[0026] Compared with the prior art, the beneficial effects are that the carbon material prepared by the activation process can be screened, the components such as carbon powder and fine particles mixed in the carbon material which seriously hinder the acid recovery are fully screened out, and the acid recovery efficiency of the carbon material is improved. Meanwhile, the carbon material can be cyclically conveyed and ground, and the large carbon material is fully ground and crushed, so that the particle size of the prepared carbon material is more uniform and meets the required size requirement. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a perspective view of the outer shape structure of the device of the present application.

[0028] Figure 2 Figure 4 is a sectional view of the structure of the device of the present application.

[0029] Figure 3 Figure 5 is a perspective view of the structure of the device of the present application.

[0030] Figure 4 Figure 6 is another perspective view of the structure of the device of the present application.

[0031] In the figure: outer cylinder 1, feed pipe 11, discharge pipe 12, foot 13, bearing seat 14, discharge pipe 15, discharge hole 16, sealing plate 17, guide groove 18, inner cylinder 2, guide ring 21, screening cylinder 3, bottom plate 31, ring groove 311, side support plate 32, top plate 33, inner gear ring 331, guide rod 332, screening mesh 34, motor 41, drive shaft 42, feed blade 421, transmission shaft 51, transmission gear 52, main gear 53, upper grinding disc 54, lower grinding disc 55, grinding channel 56, scattering blade 57. DETAILED DESCRIPTION

[0032] In order to further explain the technical solutions of the present application, the present application will be described in detail below through specific embodiments.

[0033] As Figures 1-4As shown, a kind of carbon material phosphoric acid recovery equipment, including outer cylinder 1, inner cylinder 2, screening cylinder 3, drive mechanism and grinding mechanism, the upper end of outer cylinder 1 is equipped with feed pipe 11 and the lower end is equipped with discharge pipe 12, feed pipe 11 can be introduced into carbon material to screening cylinder 3.In the upper end of outer cylinder, liquid inlet pipe is equipped for introducing low concentration recovery phosphoric acid and clean water into screening cylinder 3.The lower end of outer cylinder 1 is provided with several supporting legs 13, so that outer cylinder 1 is more stable and firm to stand, the upper end of inner cylinder 2 is fixedly connected with outer cylinder 1, screening cylinder 3 is sleeved outside inner cylinder 2, screening cylinder 3 includes bottom plate 31, side support plate 32 and top plate 33, bottom plate 31 and top plate 33 are connected by side support plate 32, adjacent side support plate 32 is equipped with screening net 34, screening net 34 is equipped with screening hole for screening carbon powder and small particles.The bottom plate 31 is rotatably connected with the bottom of outer cylinder 1, and the top plate 33 is slidably connected with the top of outer cylinder 1.The drive mechanism includes drive motor 41 and drive shaft 42, the drive motor 41 is installed on the upper end of outer cylinder 1, the output shaft of drive motor 41 is connected with drive shaft 42, drive shaft 42 passes through inner cylinder 2, and the upper end of drive shaft 42 is rotatably connected with outer cylinder 1, and the lower end of drive shaft 42 is fixedly connected with screening cylinder 3.The grinding mechanism is arranged in the inner cylinder 2 and grinds the material.After the above structure is used, the drive motor 41 is started, so that the drive shaft 42 drives the screening cylinder 3 to rotate together, and the inner cylinder 2 is fixedly arranged in the outer cylinder 1.When the screening cylinder 3 rotates, centrifugal force is generated, the impurities with small volume are screened out through the screening net 34, and the carbon material falls slowly to the bottom of the screening cylinder 3, and the injected low concentration recovery phosphoric acid and the clean water for flushing the carbon material can also pass through the screening net 34 and be recovered through the discharge pipe 12.

[0034] In the embodiment, the inner bottom end of outer cylinder 1 is provided with a bearing seat 14, the bottom plate 31 and the bearing seat 14 are rotatably connected through a bearing, the bearing seat 14 can support the screening cylinder 3, the lower end of the bearing seat 14 is provided with a discharge pipe 15, the bottom plate 31 and the bearing seat 14 are provided with a discharge hole 16 in communication with the discharge pipe 15, the discharge pipe 15 is provided with a blocking plate 17, when the blocking plate 17 blocks the discharge pipe 15, the material can be kept in the screening cylinder 3.When the blocking plate 17 opens the discharge pipe 15, the material in the screening cylinder 3 can enter the discharge pipe 15 through the discharge hole 16 and be discharged and collected through the discharge pipe 12.The lower end of the blocking plate 17 is provided with an operating rod, so that the blocking plate 17 can be conveniently operated and taken out.

[0035] In the embodiment, the upper end of the inner cylinder 2 is fixedly connected with the outer cylinder 1 through a support, the lower end of the inner cylinder 2 is provided with a guide ring 21, the upper surface of the bottom plate 31 is provided with a ring groove 311, the guide ring 21 and the ring groove 311 are matched with each other, so that the bottom end of the screening cylinder 3 can be further limited, and the screening cylinder 3 rotates more stably.

[0036] In the embodiment, the grinding mechanism comprises a transmission shaft 51, a transmission gear 52, a main gear 53, an upper grinding disc 54 and a lower grinding disc 55, the upper end of the transmission shaft 51 is rotationally connected with the outer cylinder body 1, the lower end of the transmission shaft 51 is rotationally connected with the inner cylinder body 2, the transmission gear 52 is sleeved on the transmission shaft 51, the inner ring gear 331 meshing with the transmission gear 52 is arranged on the top plate 33, the main gear 53 is rotationally sleeved on the outside of the drive shaft 42, the main gear 53 is rotationally connected with the outer cylinder body 1, the upper grinding disc 54 is fixedly connected with the lower end of the main gear 53 and the upper grinding disc 54 is arranged above the upper opening of the inner cylinder body 2, the lower grinding disc 55 is fixedly connected with the drive shaft 42 and the lower grinding disc 55 is arranged in the upper opening of the inner cylinder body 2, the lower grinding disc 55 is in the shape of a quarter of a disc, the grinding channel 56 is formed between the upper grinding disc 54 and the lower grinding disc 55, the gap of the grinding channel 56 is larger than the size of the screening hole, so that the ground carbon material can meet the size requirement and cannot pass through the screening hole, the drive shaft 42 is provided with a feeding blade 421 at the lower end of the lower grinding disc 55, the feeding blade 421 is in the shape of a spiral and can convey the material at the bottom upward. After the above structure is adopted, the material in the screening cylinder 3 gradually converges to the middle part at the bottom of the screening cylinder 3, the material is conveyed upward along the inner cylinder body 2 under the action of the movement of the feeding blade 421, when the material is conveyed to the upper end of the inner cylinder body 2, the material enters the grinding channel 56 between the upper grinding disc 54 and the lower grinding disc 55, the material with large volume is ground and crushed, then the material continues to be discharged and falls into the screening cylinder 3, and the above steps are repeated. More solidly, the grinding mechanism further comprises a scattering blade 57, the scattering blades 57 are evenly arranged on the transmission shaft 51, the scattering blades 57 can scatter the material and also convey the material downward.

[0037] In the embodiment, the upper end of the top plate 33 is provided with a guide rod 332, the upper side wall inside the outer cylinder body 1 is provided with an annular guide groove 18, the guide rod 332 and the guide groove 18 are connected in cooperation, the guide rod 332 can support and limit the upper end of the screening cylinder 3 and further guide the rotation of the screening cylinder 3.

[0038] A preparation process based on the above device, comprising the following steps:

[0039] (1) The activated carbon material is poured into the outer cylinder body 1 from the feeding pipe 11, so that the material falls into the inside of the screening cylinder 3 and low-concentration recycled phosphoric acid is injected;

[0040] (2) The drive motor 41 is started, the drive motor 41 drives the drive shaft 42 and the screening cylinder 3 to rotate;

[0041] (3) When the screening cylinder 3 rotates, the inner ring gear 331 meshes with the transmission gear 52, the transmission shaft 51 is driven to rotate, the transmission shaft 51 drives the scattering blades 57 to rotate, the material is scattered and downwardly stirred and conveyed;

[0042] (4) The centrifugal force is generated when the screening cylinder 3 rotates, and the fine particles, impurities and carbon powder fall outside through the screening net 34 into the outer cylinder 1 and are discharged through the discharge pipe 12 for collection;

[0043] (5) The driving shaft 42 drives the material conveying blade 421 and the lower grinding disc 55 to rotate, and the material agglomerated at the bottom of the screening cylinder 3 is conveyed upwards along the inner cylinder 2 to the upper opening of the inner cylinder 2;

[0044] (6) The transmission gear 52 drives the main gear 53 to rotate, thereby driving the upper grinding disc 54 to rotate in the opposite direction relative to the lower grinding disc 55, and when the material is conveyed to the upper opening of the inner cylinder 2, the material falls into the screening cylinder 3 again through the grinding channel 56, and the material with a larger size is ground and crushed when passing through the grinding channel 56;

[0045] (7) The steps (4)-(6) are repeated to fully discharge the components such as carbon powder and fine particles in the screening cylinder 3 which seriously hinder acid recovery, and the material is cyclically ground so that the carbon material can meet the size requirement;

[0046] (8) After the recovery and screening are completed, clean water is introduced to recover the residual phosphoric acid in the screened material again, and the carbon material is rinsed, and then the liquid after washing is discharged through the discharge pipe 12 for recovery;

[0047] (9) The operating rod is pulled downward to take out the blocking plate 17, the screening cylinder 3 is slowly driven to rotate, the material in the screening cylinder 3 falls into the discharge pipe 15 through the discharge hole 16, and is discharged through the discharge pipe 12;

[0048] (10) The carbon material is collected and dried.

[0049] Compared with the prior art, the beneficial effects are that the carbon material prepared by the activation process can be screened, the components such as carbon powder and fine particles in the carbon material which seriously hinder acid recovery can be fully screened out, and the efficiency of acid recovery of the carbon material is improved. At the same time, the carbon material can be cyclically conveyed and ground, the large carbon material is fully ground and crushed, the particle size of the prepared carbon material is more uniform, and the size requirement is met.

[0050] The above embodiments and drawings do not limit the product form and style of the present application, and any appropriate changes or modifications made by those skilled in the art shall be considered as not departing from the patent scope of the present application.

Claims

1. A process for phosphoric acid recovery from a carbonaceous material, characterized by, The method comprises the following steps: (1) pouring the activated carbon material into the outer cylinder through the feeding pipe, so that the material falls into the inside of the screening cylinder and is mixed with the low-concentration recycled phosphoric acid; (2) starting the driving motor, which drives the driving shaft and the screening cylinder to rotate; (3) when the screening cylinder rotates, the inner ring gear meshes with the transmission gear, driving the transmission shaft to rotate, which drives the dispersing blades to rotate, dispersing and downwardly stirring and conveying the material; (4) when the screening cylinder rotates, centrifugal force is generated, and the fine particles, impurities and carbon powder pass through the screening net and fall into the outer cylinder, and are discharged through the discharge pipe; (5) the driving shaft drives the feeding blades and the lower grinding disc to rotate, conveying the material gathered at the bottom of the screening cylinder to the upper opening of the inner cylinder; (6) the transmission gear drives the main gear to rotate, thereby driving the upper grinding disc to rotate reversely relative to the lower grinding disc, and when the material is conveyed to the upper opening of the inner cylinder, the material falls into the screening cylinder again through the grinding channel, and the material with a large size is ground and crushed when passing through the grinding channel; (7) repeating steps (4)-(6) to fully discharge the impurities that seriously hinder the flow of the recycled phosphoric acid, and to cyclically grind the material, so that the carbon material can be screened to meet the size requirement during the recycling process; (8) after the recycling and screening are completed, clean water is introduced to recycle the residual phosphoric acid in the screened material and to rinse the carbon material; (9) pulling down the operating rod to take out the blocking plate, slowly driving the screening cylinder to rotate, so that the rinsed material in the screening cylinder falls into the discharge pipe through the discharge hole and is discharged through the discharge pipe; (10) collecting and drying the carbon material; The device comprises an outer cylinder, an inner cylinder, a screening cylinder, a driving mechanism and a grinding mechanism, the upper end of the outer cylinder is provided with a feeding pipe and the lower end is provided with a discharge pipe, the upper end of the inner cylinder is fixedly connected with the outer cylinder, the screening cylinder is sleeved outside the inner cylinder, the screening cylinder comprises a bottom plate, side support plates and a top plate, the bottom plate and the top plate are connected through the side support plates, the adjacent side support plates are provided with a screening net, the bottom plate is rotatably connected with the bottom of the outer cylinder, and the top plate is slidably connected with the top of the outer cylinder, the driving mechanism comprises a driving motor and a driving shaft, the driving motor is installed at the upper end of the outer cylinder, the output shaft of the driving motor is connected with the driving shaft, the driving shaft penetrates through the inner cylinder, the upper end of the driving shaft is rotatably connected with the outer cylinder, and the lower end of the driving shaft is fixedly connected with the screening cylinder, and the grinding mechanism is arranged in the inner cylinder and grinds the material; The grinding mechanism comprises a transmission shaft, a transmission gear, a main gear, an upper grinding disc and a lower grinding disc, the upper end of the transmission shaft is rotatably connected with the outer cylinder, the lower end of the transmission shaft is rotatably connected with the inner cylinder, the transmission gear is sleeved on the transmission shaft, the top plate is provided with an inner ring gear meshing with the transmission gear, the main gear is rotatably sleeved outside the driving shaft, the main gear is rotatably connected with the outer cylinder, the upper grinding disc is fixedly connected at the lower end of the main gear and is arranged above the upper opening of the inner cylinder, the lower grinding disc is fixedly connected on the driving shaft and is arranged in the upper opening of the inner cylinder, the upper grinding disc and the lower grinding disc form a grinding channel therebetween, and the driving shaft is provided with feeding blades at the lower end of the lower grinding disc.

2. A process for phosphoric acid recovery from carbonaceous material as claimed in claim 1 wherein, The inner bottom end of the outer cylinder body is provided with a bearing seat, a bottom plate and a rotating connection between the bearing seat and the bottom plate.

3. A process for phosphoric acid recovery from carbonaceous material as claimed in claim 1 wherein, The upper end of the inner cylinder body is fixedly connected with the outer cylinder body through a support, the lower end of the inner cylinder body is provided with a guide ring, the upper surface of the bottom plate is provided with a ring groove, and the guide ring and the ring groove are matched with each other.

4. A process for phosphoric acid recovery from carbonaceous material as claimed in claim 3 wherein, The grinding mechanism further comprises scattering blades which are uniformly distributed on the transmission shaft.

5. A process for phosphoric acid recovery from carbonaceous material as claimed in claim 1 wherein, The upper end of the top plate is provided with a guide rod, the upper side wall in the inner part of the outer cylinder body is provided with an annular guide groove, and the guide rod and the guide groove are connected in a matched mode.

6. A process for phosphoric acid recovery from carbonaceous material as claimed in claim 2 wherein, The lower end of the sealing plate is provided with an operating rod.

7. A process for phosphoric acid recovery from carbonaceous material as claimed in claim 1 wherein, The lower end of the outer cylinder body is provided with a supporting leg.

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