Method for carbonizing inside and outside of solidified sludge hollow cylindrical sample and sample preparation device thereof

Abstract

The application provides a method for internal and external carbonization of a solidified silt hollow cylindrical sample, comprising the following steps: S1: providing a gas conveying mechanism, a sample storage mechanism, a hydraulic mechanism and a tamping mechanism; mixing a bacterial solution containing bacillus pasteurii, urea, water, carbide slag and soil samples, and stirring to obtain a mixture; S2: loading the mixture prepared in the step S1 into a vacancy of the sample storage mechanism, tamping by the tamping mechanism, tightly covering the cavity after tamping, completing the preparation of the sample, starting the internal reaction and the external reaction of the sample, opening the gas conveying mechanism after 24 hours, continuously conveying CO2 into the sample storage mechanism, and obtaining the internal and external carbonized solidified silt hollow cylindrical sample. The application also comprises a device used in the carbonization method, and the device and the method can solve the problems of uneven internal and external carbonization, poor sample integrity and destroyed sample uniformity in the conventional method.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sludge solidification, in particular to a method for carbonizing inside and outside of a solidified sludge hollow cylindrical sample and a sample preparation device. BACKGROUND

[0002] A large amount of engineering waste sludge is generated in the process of urban construction in the southeast coastal areas of China, which causes serious urban dust pollution due to its accumulation or transportation. Therefore, how to efficiently treat the engineering waste sludge has become a difficult problem for local governments and enterprises. In recent years, sludge solidification technology has developed rapidly, especially the use of carbide slag-carbon dioxide carbonization to cooperatively solidify sludge and use it as road subgrade filler has been favored by the academic and engineering circles. Accordingly, the dynamic and static mechanical properties of the solidified sludge type road subgrade filler have attracted widespread attention in the academic circle.

[0003] Under the action of traffic load, the solidified sludge type road subgrade filler will exhibit a phenomenon of continuous principal stress axis rotation, which will seriously affect the dynamic properties of the solidified sludge. At present, in the indoor soil test, the hollow cylindrical torsional shear test is the main test method for simulating the action of traffic load by realizing the continuous rotation of the principal stress axis of the unit body. Therefore, the preparation of the hollow cylindrical unit body of the solidified sludge is particularly important, and especially the uniformity and integrity of the hollow cylindrical sample are directly related to the reliability of the results of the hollow cylindrical torsional shear test.

[0004] However, the current hollow cylindrical sample preparation device and method have the following problems:

[0005] (1) The current unit body carbonization method is mainly a local carbonization method on the outer surface of carbon dioxide gas, that is, the sample is carbonized by introducing carbon dioxide gas. However, for sludge, on the one hand, the permeability of the sludge sample is poor, and it is difficult for the gas to penetrate into the interior of the sample, and a large amount of solidified products will be generated on the surface of the sample due to the carbonization reaction, which will further prevent the gas from penetrating into the interior of the sample; on the other hand, a large pressure is required to press the carbon dioxide into the interior of the sample in order to realize the carbonization of the interior of the sample, but due to the low strength and weak structure of the sludge, the sample will be damaged under a large pressure before carbonization. Therefore, the traditional carbon dioxide gas carbonization method can only realize the surface and shallow layer carbonization of the sludge sample, and the unit body sample prepared by this method is not uniform inside and outside, which seriously affects the reliability of the test results and cannot provide effective theoretical guidance for actual engineering.

[0006] (2) The hollow cylindrical unit body is the largest among all unit bodies in volume, and the uniformity of the sample may be damaged locally due to the improper device and method during the preparation of the hollow cylindrical unit body sample, which will seriously affect the test results and cause data deviation, and the data cannot be effectively applied.

[0007] (3) Hollow cylindrical unit body demolding generally adopts static pressure sample ejection, and currently a single rod connection mode is usually adopted between the loading sample ejection chassis and the loading rod, which will cause the chassis to tilt due to the bending of the loading rod over a long period of time, as shown in Figure 6 , so that the sample is changed from axial compression to bias, local stress concentration is generated, and the uniformity of the sample is damaged. SUMMARY

[0008] The technical problem to be solved by the present application is to provide a solidified silt hollow cylindrical sample internal and external carbonization method to solve the problems of uneven internal and external carbonization of conventional methods, damaged sample uniformity and difficult demolding.

[0009] To solve the above problems, the present application provides a solidified silt hollow cylindrical sample internal and external carbonization method, comprising the following steps:

[0010] S1: providing a gas conveying mechanism, a sample storage mechanism, a hydraulic mechanism and a compaction mechanism;

[0011] Mixing bacterial liquid containing Bacillus pasteurii, urea, water, calcium carbide slag and soil sample, and stirring to obtain a mixture;

[0012] S2: loading the mixture prepared in step S1 into the vacancy of the sample storage mechanism, and performing compaction treatment by the compaction mechanism; after compaction is completed, the cavity is tightly covered, the sample production is completed, the internal reaction and the external reaction of the sample start, and after waiting for 24 hours, the gas conveying mechanism is opened, CO2 is continuously introduced into the sample storage mechanism from the bottom, and a solidified silt hollow cylindrical sample with internal and external carbonization is obtained; a plurality of small holes are arranged on the sample storage mechanism, the small holes are used to ensure that the carbon dioxide concentration and pressure around the sample are equal during the aeration process, and the sample is separated from the sample storage mechanism by the hydraulic mechanism.

[0013] As a preferred scheme, in step S2, the expression of the internal reaction is:

[0014]

[0015] Ca 2+ +Cell→Cell-Ca 2+

[0016] CO2-3+Cell-Ca 2+ →Cell-CaCO3↓

[0017] The Cell is a negatively charged cell of microorganisms;

[0018] The expression of the external reaction is:

[0019] CO2+2OH- + Ca2+ = CaCO3↓ + H2O.

[0020] In the above method, the carbonation is realized by providing an alkaline environment for the sample outside the sample using carbide slag and urea to dissolve carbon dioxide to generate carbonate ions, and then reacting with calcium ions provided by the carbide slag to generate calcium carbonate to realize carbonation outside the sample. The carbonation is realized by using the urease produced by the microorganism Bacillus pasteurii to hydrolyze urea to generate carbonate ions, and then reacting with calcium ions provided by the carbide slag to generate calcium carbonate.

[0021] As a preferred solution, the step S2 further includes the step of introducing nitrogen gas after obtaining the solidified silt hollow cylindrical sample with internal and external carbonation, and removing and collecting the waste gas of the reaction.

[0022] Another technical problem to be solved by the present application is to provide a solidified silt hollow cylindrical sample internal and external carbonation device to solve the problem that the conventional device cannot internalize uniform carbonation sample.

[0023] In order to solve the above problems, the present application provides a solidified silt hollow cylindrical sample internal and external carbonation device, which is suitable for the method, and the carbonation device comprises an outer cylinder, a tamping mechanism and a gas conveying mechanism, the gas conveying mechanism is in communication with the inside of the outer cylinder, and the tamping mechanism is arranged above the outer cylinder.

[0024] The top of the outer cylinder is provided with a detachable upper top cover, and the inside of the outer cylinder is provided with:

[0025] A hydraulic mechanism, the hydraulic mechanism comprises a hydraulic machine and a first machine column, a second machine column, a third machine column and a fourth machine column connected with the hydraulic machine, the hydraulic machine can drive the first machine column, the second machine column, the third machine column and the fourth machine column to move up and down, and the hydraulic machine is arranged at the bottom of the outer cylinder.

[0026] The sample storage mechanism comprises an inner connecting sample top cover, a cylindrical plate, an outer connecting cylindrical plate, an upper layer gas blocking plate, a lower layer gas blocking plate, an inner connecting cylindrical plate and a sample base, the sample top cover is located at the upper end of the outer connecting cylindrical plate, the inner connecting cylindrical plate is located inside the outer connecting cylindrical plate, and there is a cavity between the outer connecting cylindrical plate and the inner connecting cylindrical plate, the sample base is movably arranged in the cavity, and the shape and size of the sample base are matched with the cavity, the upper layer gas blocking plate and the lower layer gas blocking plate are respectively located above and below the cavity, and the lower layer gas blocking plate is located below the sample base, the upper layer gas blocking plate is movably arranged at the upper end of the sample top cover, the inner connecting cylindrical plate is connected with the first machine column, the outer connecting cylindrical plate is connected with the second machine column, the sample base is connected with the third machine column, and the lower layer gas blocking plate is connected with the fourth machine column.

[0027] Small holes are arranged on the upper top cover, the bottom of the sample top cover and the sample base, and protrusions matched with the small holes are arranged on the upper layer gas blocking plate and the lower layer gas blocking plate.

[0028] The compaction mechanism is used for compacting the sample, the hydraulic mechanism is used for separating the sample, and the problem of difficult sample demolding in the conventional method is solved; in order to ensure that the carbon dioxide concentration and pressure of the upper part, the bottom and the side surface of the sample are equal, small holes and protrusions are designed, and there is a large height difference between the sample and the gas inlet, so that the gas cannot impact the sample, the uniformity of the external carbonization of the sample can be well ensured, and the problems of poor overall sample caused by non-uniform internal and external carbonization in the conventional method and damaged sample uniformity are solved.

[0029] As a preferred scheme, the carbonization device further comprises a tail gas collecting piston and a tail gas collecting mechanism, the tail gas collecting piston is arranged on the upper side wall of the outer cylinder body and communicates with the inside of the outer cylinder body, and the tail gas collecting mechanism is connected with the tail gas collecting piston.

[0030] As a preferred scheme, the gas conveying mechanism comprises a gas conveying device and a gas conveying piston, the gas conveying piston is arranged on the lower side wall of the outer cylinder body and communicates with the inside of the outer cylinder body, and the gas conveying device is connected with the gas conveying piston.

[0031] The gas used by the gas conveying device is waste gas containing a large amount of carbon dioxide in an iron mill, and some toxic gases must be removed by a special device during the ventilation carbonization; the tail gas collecting piston is closed after the carbon dioxide in the sample is completely discharged from the carbonization device into the tail gas collecting device by the nitrogen gas conveyed by the gas conveying device after the sample carbonization is completed, so as to prevent the backflow of tail gas; the carbon dioxide concentration testing device is arranged on the inner wall of the outer cylinder of the device around the sample, and the pressure testing device is arranged in the gas conveying device, so that the carbon dioxide concentration testing device and the pressure testing device can control the better conditions for the survival of bacteria; the carbon dioxide gas is conveyed from the gas conveying piston at the bottom of the sample preparation device, and the carbon dioxide is accumulated at the bottom during the gas conveying due to the larger density of carbon dioxide than air, so that the air is discharged from the tail gas collecting piston above the sample preparation device.

[0032] As a preferred scheme, the inner connecting cylindrical plate and the outer connecting cylindrical plate are both multi-layer structures, and adjacent two layers are connected by a telescopic rod; the upper gas blocking plate is connected with the outer cylinder body through a connecting rod.

[0033] The inner connecting cylindrical plate and the outer connecting cylindrical plate are both multi-layer structures, and adjacent two layers are connected by a telescopic rod; the inner connecting cylindrical plate and the outer connecting cylindrical plate are both multi-layer structures, and adjacent two layers are connected by a telescopic rod; the telescopic rod can move freely, and when the hydraulic machine column moves downward, the bottom layer of the cylindrical plate is driven to move downward; when the bottom layer of the cylindrical plate is separated from the sample, the telescopic rod reaches the maximum elongation, and when the hydraulic machine column continues to move downward, the next layer of the cylindrical plate is driven to move downward, until all the cylindrical plates are separated from the sample.

[0034] As a preferred scheme, the hydraulic machine is fixed with an inner column, and the top cover is threadedly connected with the inner column through a screw piston. The outer connecting cylindrical plate is connected with the upper top cover through an outer cylindrical sleeve, and the inner connecting cylindrical plate is connected with the upper top cover through an inner cylindrical sleeve.

[0035] The outer cylindrical sleeve is connected with the outer connecting cylindrical plate, the inner cylindrical sleeve is connected with the inner connecting cylindrical plate, and the upper top cover is connected with the top end of the device outer cylinder; the connection modes are all V-shaped connection, and the inner connecting cylindrical plate and the outer connecting cylindrical plate are both five-layer structures, and the connection modes of adjacent two layers are also V-shaped connection.

[0036] As a preferred scheme, the carbonization device further comprises a carbon dioxide concentration testing device and a carbon dioxide pressure testing device, the carbon dioxide concentration testing device is arranged on the inner wall of the outer cylinder body near the sample storage mechanism, and the carbon dioxide pressure testing device is arranged on the gas conveying device.

[0037] As a preferred scheme, the number of the first machine column, the second machine column, the third machine column and the fourth machine column is three; the third machine column is provided with a machine column sleeve, and the machine column sleeve is located below the sample base.

[0038] As a preferred scheme, the tamping mechanism comprises a tamping hydraulic machine and a layered buckle, and the layered buckle is matched with the cavity in shape and size, and generally comprises a plurality of hollow annular rings arranged from top to bottom, and can be used as calibration during layered tamping, so that the height of the sample tamped each time is equal.

[0039] The third hydraulic machine column sleeve can fix the maximum downward distance of the sample base, and ensure the height of the sample.

[0040] The beneficial effects of the present application are as follows:

[0041] ①The present application adopts the method of internal and external carbonization combination, overcomes the defect of uneven internal and external carbonization of the traditional gas carbonization method, and realizes the recycling of industrial waste gas. When in use, first, the industrial waste gas is pretreated to remove some toxic gases, the carbon dioxide in the waste gas reacts with the alkaline environment (created by calcium slag and urea) to generate carbonate ions, and reacts with the calcium ions rich in calcium slag to generate calcium carbonate, realizing the surface carbonization of the hollow cylindrical sample, and the urease produced by the microorganism bacillus pasteurii hydrolyzes urea to generate carbonate ions and calcium ions provided by the calcium slag to generate calcium carbonate, so that the sample is carbonized inside and outside, and the adsorption and recycling of carbon dioxide in the industrial waste gas are realized, which has significant environmental benefits.

[0042] ②The present application realizes the integration of sample preparation and carbonization, the sample starts to carbonize after sample preparation is completed, the hollow cylindrical sample is exposed by moving the internal and external connecting cylindrical plate downward, and the external carbonization is realized by introducing the industrial waste gas rich in carbon dioxide, which significantly reduces the disturbance to the sample during carbonization, ensures the integrity and consistency of the hollow cylindrical sample, and improves the reliability of the test results.

[0043] ③In the demolding process, the following problems will be caused when the traditional single rod is used to drive the sample to move up and down: (1) stress concentration and local damage; (2) long-time use of single rod to drive the sample to move up and down will cause the rod to bend and generate a bias stress, resulting in cracks in the unit, affecting the test accuracy; (3) the sample edge will tilt due to the bending moment, destroying the uniformity of the sample. The first machine column, the second machine column, the third machine column and the fourth machine column of the present application have multiple columns, and the columns of each type of machine column can move downward or upward at the same time, which can effectively avoid the problems caused by the traditional single rod driving the sample to move up and down.

[0044] ④When demolding, the upper layer connecting rod is used to move the upper layer of the gas blocking plate upward until the top of the upper part of the top cover is moved, exposing the uniformly arranged small holes of the sample top cover, and then the hydraulic machine is used to move the lower layer of the gas blocking plate downward by lowering the fourth machine column, exposing the uniformly arranged small holes of the sample base, ensuring that the upper part, bottom and side of the sample have equal carbon dioxide concentration and pressure, and the sample has a large height difference with the gas inlet, so that the gas will not impact the sample, and the uniformity of the external carbonization of the sample can be well guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is the sample preparation diagram of the device of the present application;

[0046] Figure 2 is the carbonization diagram of the device of the present application;

[0047] Figure 3 is the 1-1 sectional view of the device of the present application;

[0048] Figure 4 is the 2-2 sectional view of the device of the present application;

[0049] Figure 5 is the principle diagram of internal reaction and external reaction in the carbonization process of the device of the present application;

[0050] Figure 6 is the local stress diagram of the prior art scheme in the background art;

[0051] Figure 7 is the structure diagram of the device of the present application when the lowermost telescopic rod of the internal connecting type cylindrical plate and the external connecting type cylindrical plate is in the stretched state.

[0052] BRIEF DESCRIPTION OF DRAWINGS:

[0053] 1, gas delivery device; 2, gas delivery piston; 3, tail gas collection piston; 4, tail gas collection mechanism; 5, sample base; 6, screw piston; 7, upper gas blocking plate; 8, lower gas blocking plate; 9, internal connecting cylindrical plate; 10, external connecting cylindrical plate; 11, hydraulic press; 12, No. 1 machine column; 13, No. 2 machine column; 14, No. 3 machine column; 15, No. 4 machine column; 16, upper connecting rod; 17, sample top cover; 18, outer cylinder; 19, inner column; 20, carbon dioxide concentration testing device; 21, carbon dioxide pressure testing device; 22, inner cylindrical sleeve; 23, outer cylindrical sleeve; 24, upper top cover; 25, machine column sleeve; 26, solidified silt hollow cylindrical sample; 27, compaction hydraulic press; 28, layered buckle. DETAILED DESCRIPTION

[0054] The technical solutions of the present application will be described below in a clear and complete manner. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0055] The present application provides a method for internal and external carbonization of a solidified silt hollow cylindrical sample, comprising the following steps:

[0056] S1: providing a gas delivery mechanism, a sample storage mechanism, a hydraulic mechanism, and a compaction mechanism;

[0057] Mixing a bacterial solution containing Bacillus pasteurii, urea, water, calcium carbide slag, and soil samples, and stirring to obtain a mixture;

[0058] S2: loading the mixture prepared in step S1 into the vacancy of the sample storage mechanism, and performing compaction treatment by the compaction mechanism. After compaction is completed, the cavity is tightly covered, the sample production is completed, the internal reaction and external reaction of the sample begin, and after waiting for 24 hours, the gas delivery mechanism is opened, CO2 is continuously introduced into the sample storage mechanism from the bottom, and a solidified silt hollow cylindrical sample with internal and external carbonization is obtained. A plurality of small holes are provided on the sample storage mechanism, which are used to ensure that the carbon dioxide concentration and pressure around the sample are equal during the aeration process, and the sample is separated from the sample storage mechanism by the hydraulic mechanism.

[0059] As a preferred scheme, in step S2, the reaction process is as shown in the following formula: Figure 5 The expression of the internal reaction is:

[0060]

[0061] Ca 2+ +Cell→Cell-Ca 2+

[0062] CO2-3+Cell-Ca 2+ →Cell-CaCO3↓

[0063] The Cell is a negatively charged cell of a microorganism;

[0064] The expression of the external reaction is:

[0065] CO2+2OH - +Ca2+=CaCO3↓+H2O.

[0066] As a preferred scheme, the step S2 further comprises the step of introducing nitrogen after obtaining the solidified silt hollow cylindrical sample with internal and external carbonization, and removing and collecting the waste gas of the reaction.

[0067] The present application provides a solidified silt hollow cylindrical sample internal and external carbonization device, as shown in Figures 1-4 The carbonization device is suitable for the method, and the carbonization device comprises an outer cylinder 18, a tamping mechanism, and a gas conveying mechanism in communication with the inside of the outer cylinder 18; the tamping mechanism is arranged above the outer cylinder 18;

[0068] A detachable upper cover 24 is arranged at the top of the outer cylinder 18; the inside of the outer cylinder 18 is provided with:

[0069] A hydraulic mechanism, which comprises a hydraulic machine 11 and a first machine column 12, a second machine column 13, a third machine column 14, and a fourth machine column 15 connected with the hydraulic machine 11; the hydraulic machine 11 can drive the first machine column 12, the second machine column 13, the third machine column 14, and the fourth machine column 15 to move up and down; the hydraulic machine 11 is arranged at the bottom of the outer cylinder 18;

[0070] The sample storage mechanism comprises an inner connecting sample top cover 17, a cylindrical plate, an outer connecting cylindrical plate 10, an upper gas blocking plate 7, a lower gas blocking plate 8, an inner connecting cylindrical plate 9 and a sample base 5, the sample top cover 17 is located at the upper end of the outer connecting cylindrical plate 10, the inner connecting cylindrical plate 9 is located inside the outer connecting cylindrical plate 10, and there is a cavity between the outer connecting cylindrical plate 10 and the inner connecting cylindrical plate 9, the sample base 5 is movably arranged in the cavity, and the shape and size of the sample base 5 are matched with the cavity, the upper gas blocking plate 7 and the lower gas blocking plate 8 are located above and below the cavity respectively, and the lower gas blocking plate 8 is located below the sample base 5, the upper gas blocking plate 7 is movably arranged at the upper end of the sample top cover 17, the inner connecting cylindrical plate 9 is connected with the first machine column 12, the outer connecting cylindrical plate 10 is connected with the second machine column 13, the sample base 5 is connected with the third machine column 14, and the lower gas blocking plate 8 is connected with the fourth machine column 15; the upper top cover 24, the bottom of the sample top cover 17 and the sample base 5 are provided with small holes, and the upper gas blocking plate 7 and the lower gas blocking plate 8 are provided with protrusions matched with the small holes.

[0071] Preferably, the carbonization device further comprises a tail gas collecting piston 3 and a tail gas collecting mechanism 4, the tail gas collecting piston 3 is arranged on the upper side wall of the outer cylinder body 18 and communicates with the inside of the outer cylinder body 18, and the tail gas collecting mechanism 4 is connected with the tail gas collecting piston 3.

[0072] Preferably, the gas conveying mechanism comprises a gas conveying device 1 and a gas conveying piston 2, the gas conveying piston 2 is arranged on the lower side wall of the outer cylinder body 18 and communicates with the inside of the outer cylinder body 18, and the gas conveying device 1 is connected with the gas conveying piston 2.

[0073] Preferably, the inner connecting cylindrical plate 9 and the outer connecting cylindrical plate 10 are both multi-layer structures, and adjacent two layers of structures are connected through telescopic rods; the upper gas blocking plate 7 is connected with the outer cylinder body 18 through an upper connecting rod 16.

[0074] The inner connecting cylindrical plate 9 and the outer connecting cylindrical plate 10 are both divided into multi-layer structures, adjacent two layers of structures are connected by telescopic rods, the telescopic rods can move freely, when the hydraulic machine 11 column moves downward, the bottommost layer of cylindrical plates is driven to move downward, when the bottommost layer of cylindrical plates is separated from the sample, at this time, the telescopic rods reach the maximum elongation, when the hydraulic machine 11 column continues to move downward, the next layer of cylindrical plates is driven to move downward, until all the cylindrical plates are separated from the sample.

[0075] Preferably, the hydraulic machine 11 is fixed with an inner column 19, and the top cover is threadedly connected with the inner column 19 through a screw piston 6. The outer connecting cylindrical plate 10 is connected with the upper top cover 24 through an outer cylindrical sleeve 23, and the inner connecting cylindrical plate 9 is connected with the upper top cover 24 through an inner cylindrical sleeve 22. The outer cylindrical sleeve 23 is connected with the outer connecting cylindrical plate 10, the inner cylindrical sleeve 22 is connected with the inner connecting cylindrical plate 9, the upper top cover is connected with the top end of the device outer cylinder, and the connection mode is V-shaped connection. The inner connecting cylindrical plate 9 and the outer connecting cylindrical plate 10 are both divided into five layers, and the connection mode of adjacent two layers is also V-shaped connection.

[0076] Preferably, the carbonization device further comprises a carbon dioxide concentration testing device 20 and a carbon dioxide pressure testing device 21. The carbon dioxide concentration testing device 20 is arranged on the inner wall of the outer cylinder body 18 close to the sample storage mechanism, and the carbon dioxide pressure testing device 21 is arranged on the gas conveying device 1.

[0077] Preferably, the number of the first machine column 12, the second machine column 13, the third machine column 14 and the fourth machine column 15 is three, and the third machine column 14 is provided with a machine column sleeve 25, which is located below the sample base 5.

[0078] Preferably, the tamping mechanism comprises a tamping hydraulic machine 27 and a layered buckle 28. The layered buckle 28 is connected with the bottom of the tamping hydraulic machine 27. The hydraulic machine 27 is used for driving the layered buckle 28 to move up and down, and the shape and size of the layered buckle 28 are matched with the cavity.

[0079] In the above structure of the present application:

[0080] The first hydraulic machine 11 column is connected with the inner connecting cylindrical plate 9, and the inner connecting cylindrical plate 9 is controlled to move up and down by controlling the first hydraulic machine 11 column to move up and down through the hydraulic machine 11;

[0081] The second hydraulic machine 11 column is connected with the outer connecting cylindrical plate 10, and the outer connecting cylindrical plate 10 is controlled to move up and down by controlling the second hydraulic machine 11 column to move up and down through the hydraulic machine 11;

[0082] The third hydraulic machine 11 column is connected with the sample base 5, and the sample base 5 is controlled to move up and down by controlling the third hydraulic machine 11 column to move up and down through the hydraulic machine 11;

[0083] The fourth hydraulic machine 11 column is connected with the lower layer gas blocking plate 8, and the lower layer gas blocking plate 8 is controlled to move up and down by controlling the fourth hydraulic machine 11 column to move up and down through the hydraulic machine 11;

[0084] The tamping mechanism is used for tamping the sample; the hydraulic mechanism is used for separating the sample;

[0085] The internal connecting cylindrical plate 9 and the external connecting cylindrical plate 10 are both divided into multiple layers, which can be generally divided into five layers, and the two adjacent layers are connected by the telescopic rod, which can move freely. When the hydraulic machine 11 column moves downward, the bottom layer of the cylindrical plate is driven to move downward. When the bottom layer of the cylindrical plate is separated from the sample, the telescopic rod reaches the maximum extension amount. When the hydraulic machine 11 column continues to move downward, the next layer of the cylindrical plate is driven to move downward, until all the cylindrical plates are separated from the sample.

[0086] The third hydraulic machine 11 column sleeve can fix the maximum downward distance of the sample base 5, so as to ensure the height of the sample;

[0087] The top of the device outer cylinder is flush with the top of the external connecting cylindrical plate 10 during assembly, and the device inner column 19 is flush with the top of the internal connecting cylindrical plate 9 during assembly.

[0088] The following provides a description of the above-mentioned solutions of the present application in combination with the examples of data:

[0089] Example 1:

[0090] A method for carbonizing the inside and outside of a solidified silt hollow cylindrical sample, comprising the following steps:

[0091] S1: In the device, the bacterial solution containing Bacillus pasteurii, urea, water, solidifying agent, and soil sample are stirred according to a certain proportion by using a stirring rod;

[0092] S2: After uniform stirring, the mixture is divided into five equal parts and sequentially placed in the cavities of the sample preparation device for layered tamping, that is, each part of the mixed silt is tamped by using the tamping device;

[0093] The internal connecting cylindrical plate 9 and the external connecting cylindrical plate 10 are moved upward by using the hydraulic machine 11 through the first hydraulic machine 11 column and the second machine column 13. The external connecting cylindrical plate 10 is moved to the clamping groove between the device outer cylinder and the external connecting cylindrical plate 10. The internal connecting cylindrical plate 9 is moved to the clamping groove between the device inner column 19 and the internal connecting cylindrical plate 9. Then, the sample base 5 is tightly attached to the top of the third hydraulic machine 11 column sleeve by using the hydraulic machine 11 through the downward movement of the third hydraulic machine 11 column. Finally, the lower air blocking plate 8 is tightly attached to the sample base 5 by using the hydraulic machine 11 through the upward movement of the fourth machine column 15. The mold assembly is completed, and the mold interior is coated with a release agent;

[0094] A limiting device is set in the compaction hammer (layer buckle) in the compaction hydraulic system 27. The layer buckle 28 has four layers evenly spaced at 40mm intervals from the bottom upwards. When the uppermost layer reaches the top of the sample preparation device cavity, the first layer is compacted, and compaction is completed. After compaction, a scraping tool is used to scrape the surface. After scraping, the first layer is compacted. Then, the second layer is compacted, and the first layer compaction steps are repeated. When proceeding to the last layer, the outer cylindrical sleeve 23 and the inner cylindrical sleeve 22 are first installed. Figure 2 The sample surface is then compacted at the indicated location. After compaction, the surface is leveled with a scraper. The top cover is then tightened to complete the sample preparation. After 24 hours of curing, the internal connecting cylindrical plate 9 and the external connecting cylindrical plate 10 are moved downwards using a hydraulic press 11 until they detach from the sample. This includes using the upper connecting rod 16 to move the upper air-blocking plate 7 upwards until the top of the top cover is reached. Then, the lower air-blocking plate 8 is moved downwards using the hydraulic press 11 via the lowering column of the fourth hydraulic press 11. Move the sample 50mm, and then input the waste gas containing a large amount of carbon dioxide from the ironmaking plant through the gas supply device 1. After the gas is introduced, the mass of the sample gradually decreases until the mass of the sample no longer changes, and the carbonization of the sample is completed. Then, replace the gas in the gas supply device 1 with nitrogen and completely discharge the waste gas in the device into the tail gas collection device. Close the tail gas collection piston 3 and the gas supply piston 2. Then, use the hydraulic press 11 to lift the sample base 5 through the lifting column of the No. 3 hydraulic press 11, take out the sample, and complete the production of the unit body to obtain the solidified sludge hollow cylindrical sample 26.

[0095] The hollow cylindrical sample has a height of 200mm, an inner diameter of 60mm, and an outer diameter of 100mm. The outer carbonized cylinder 18 of the solidified sludge hollow cylindrical sample has a diameter of 800mm and a height of 1200mm. The sample base 5 has an inner diameter of 60mm and an outer diameter of 100mm. The thickness of the inner connecting cylindrical plate 9 and the outer connecting cylindrical plate 10 is 3mm. The height of the inner cylindrical sleeve 22 and the outer cylindrical sleeve 23 is 40mm, providing reserved space for the final compaction of the sample. The top of the outer cylinder of the device is embedded in the outer connecting cylindrical plate 10 by 1.5mm, and the inner column 19 of the device is embedded in the inner connecting cylindrical plate 9 by 1.5mm. The height of the inner connecting cylindrical plate 9 and the outer connecting cylindrical plate 10 is 220mm, and the top of the inner connecting cylindrical plate 9 and the outer connecting cylindrical plate 10 are flush with the top of the sample, while the bottom extends 20mm beyond the bottom of the sample.

[0096] In step S2, when the bottom layer structure of the inner connecting cylindrical plate 9 and the outer connecting cylindrical plate 10 is separated from the sample, the distance between the top of the bottom layer structure and the bottom of the adjacent layer structure is 40 mm, and the telescopic rod reaches the maximum length; when the second bottom layer structure is separated from the sample, the distance between the top of the second bottom layer structure and the bottom of the third bottom layer structure is 80 mm, and the telescopic rod reaches the maximum length; when the third bottom layer structure is separated from the sample, the distance between the top of the third bottom layer structure and the bottom of the fourth bottom layer structure is 120 mm, and the telescopic rod reaches the maximum length; when the fourth bottom layer structure is separated from the sample, the distance between the top of the fourth bottom layer structure and the bottom of the fifth bottom layer structure is 160 mm, and the telescopic rod reaches the maximum length.

[0097] The working principle of the present application is as follows: the raw materials are compacted by the layering buckle 28 of the compaction device, and then the inner connecting cylindrical plate 9 and the outer connecting cylindrical plate 10 are moved downward by the hydraulic machine 11 until they are separated from the sample, as shown in Figure 7 Figure 7 The upper layer connecting rod 16 is used to move the upper layer gas blocking plate 7 upward until the top of the upper part of the top cover is moved, and the small holes uniformly arranged on the top cover 17 of the sample are exposed, and then the fourth hydraulic machine 11 column is used to move the lower layer gas blocking plate 8 downward, and the small holes uniformly arranged on the base 5 of the sample are exposed, so that the carbon dioxide concentration and pressure of the upper part, the bottom part and the side surface of the sample are equal, and there is a large height difference between the sample and the gas inlet, so that the gas cannot impact the sample, and thus the carbon dioxide can be uniformly introduced into the upper part, the bottom part and the side surface of the sample from the bottom to the top, so that the sample surface and the carbon dioxide can react to produce calcium carbonate crystals for carbonization, and the carbonization of each region of the sample surface is simultaneous and more uniform, and the carbon dioxide concentration testing device 20 and the carbon dioxide concentration pressure testing device 21 can clearly determine whether the introduced carbon dioxide concentration and pressure meet the requirements.

[0098] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present application.​

Claims

1. A device for carbonation of inner and outer surfaces of a solidified sludge hollow cylinder specimen, characterized in that, The carbonization device comprises an outer cylinder (18), a tamping mechanism and a gas conveying mechanism, the gas conveying mechanism is in communication with the inside of the outer cylinder (18); the tamping mechanism is arranged above the outer cylinder; A detachable upper top cover (24) is arranged at the top of the outer cylinder (18); the inside of the outer cylinder is provided with: A hydraulic mechanism, the hydraulic mechanism comprises a hydraulic machine (11) and a first machine column (12), a second machine column (13), a third machine column (14) and a fourth machine column (15) connected with the hydraulic machine (11), the hydraulic machine (11) is used for driving the first machine column (12), the second machine column (13), the third machine column (14) and the fourth machine column (15) to move up and down, and the hydraulic machine (11) is arranged at the bottom of the outer cylinder (18); A sample storage mechanism, the sample storage mechanism comprises a sample top cover (17), an internally connected cylindrical plate (9), an externally connected cylindrical plate (10), an upper gas blocking plate (7), a lower gas blocking plate (8) and a sample base (5), the sample top cover (17) is located at the upper end of the externally connected cylindrical plate (10), the internally connected cylindrical plate (9) is located inside the externally connected cylindrical plate (10), and there is a cavity between the externally connected cylindrical plate (10) and the internally connected cylindrical plate (9), the sample base (5) is movably arranged in the cavity, and the shape and size of the sample base (5) are matched with the cavity, the upper gas blocking plate (7) and the lower gas blocking plate (8) are respectively located above and below the cavity, and the lower gas blocking plate (8) is located below the sample base (5), and the upper gas blocking plate (7) is movably arranged at the upper end of the sample top cover (17); The internally connected cylindrical plate (9) is connected with the first machine column (12), the externally connected cylindrical plate (10) is connected with the second machine column (13), the sample base (5) is connected with the third machine column (14), and the lower gas blocking plate (8) is connected with the fourth machine column (15); small holes are arranged on the upper top cover (24), the bottom of the sample top cover (17) and the sample base (5), and protrusions matched with the small holes are arranged on the upper gas blocking plate (7) and the lower gas blocking plate (8); The internally connected cylindrical plate (9) and the externally connected cylindrical plate (10) are both multi-layer structures, and adjacent two layers of structures are connected through telescopic rods.

2. The device for carbonation of solidified sludge hollow cylinder specimen inside and outside according to claim 1, characterized in that, The carbonization device further comprises a tail gas collecting piston (3) and a tail gas collecting mechanism (4), the tail gas collecting piston (3) is arranged on the upper side wall of the outer cylinder (18) and is in communication with the inside of the outer cylinder (18), and the tail gas collecting mechanism (4) is connected with the tail gas collecting piston (3).

3. The device for carbonation of solidified sludge hollow cylinder specimen inside and outside according to claim 1, characterized in that, The gas conveying mechanism comprises a gas conveying device (1) and a gas conveying piston (2), the gas conveying piston (2) is arranged on the lower side wall of the outer cylinder (18) and is in communication with the inside of the outer cylinder (18), and the gas conveying device (1) is connected with the gas conveying piston (2).

4. The device for carbonation of solidified sludge hollow cylinder specimen inside and outside according to claim 1, characterized in that, The upper layer gas blocking plate (7) is connected with the outer cylinder (18) through an upper layer connecting rod (16).

5. The device for carbonation of solidified sludge hollow cylinder specimen inside and outside according to claim 1, characterized in that, An inner column (19) is fixed on the hydraulic machine (11), and the upper cover (24) is threadedly connected with the inner column (19) through a screw piston (6); the outer connecting cylindrical plate is connected with the upper cover (24) through an outer cylindrical sleeve (23), and the inner connecting cylindrical plate is connected with the upper cover (24) through an inner cylindrical sleeve (22).

6. The device for carbonation of solidified sludge hollow cylinder specimen inside and outside according to claim 1, characterized in that, The carbonization device further comprises a carbon dioxide concentration testing device (20) and a carbon dioxide pressure testing device (21), wherein the carbon dioxide concentration testing device (20) is arranged on the inner wall of the outer cylinder (18) near the sample storage mechanism, and the carbon dioxide pressure testing device (21) is arranged on the gas conveying device (1).

7. The device for carbonation of solidified sludge hollow cylinder specimen inside and outside according to claim 1, characterized in that, The number of the first machine column (12), the second machine column (13), the third machine column (14) and the fourth machine column (15) is three; the third machine column (14) is provided with a machine column sleeve (25), and the machine column sleeve (25) is located below the sample base (5).

8. The device for carbonation of solidified sludge hollow cylinder specimen inside and outside according to claim 1, characterized in that, The tamping mechanism comprises a tamping hydraulic machine (27) and a layered buckle (28), the top of the layered buckle is connected with the tamping hydraulic machine, the hydraulic machine (27) is used for driving the layered buckle (28) to move up and down, and the shape and size of the layered buckle (28) are matched with the cavity.

9. A method for carbonation of inner and outer surfaces of a solidified sludge hollow cylinder specimen, characterized by, The method is implemented by the carbonization device according to any one of claims 1-8, and comprises the following steps: S1: providing a gas conveying mechanism, a sample storage mechanism, a hydraulic mechanism and a tamping mechanism; The bacterium liquid containing the bacillus pasteurii, urea, water, calcium carbide slag and soil sample are mixed and stirred to obtain a mixture; S2: the mixture prepared in the step S1 is loaded into the vacancy of the sample storage mechanism, tamping treatment is performed by the tamping mechanism, the cavity is tightly covered after tamping is completed, the preparation of the sample is completed, the internal reaction of the sample is started, after 24 hours, the gas conveying mechanism is opened, CO2 is continuously introduced into the sample storage mechanism from the bottom, a solidified silt hollow cylindrical sample subjected to internal and external carbonization is obtained, a plurality of small holes are arranged on the sample storage mechanism, the small holes are used to ensure that the carbon dioxide concentration and pressure around the sample are equal during the aeration process, and the sample is separated from the sample storage mechanism by the hydraulic mechanism.

10. The method of carbonation of solidified sludge hollow cylinder specimens according to claim 9, characterized in that: In the step S2, the expression of the internal reaction is: ； The cell is a microorganism with a negative charge; The expression of the external reaction is: 。 11. The solidified silt hollow cylindrical sample internal and external carbonization method according to claim 9, wherein the step S2 further comprises the steps of introducing nitrogen after the solidified silt hollow cylindrical sample subjected to internal and external carbonization is obtained, and exhausting and collecting the reaction waste gas.

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