Preparation method of green geopolymer based on engineering residual soil

Abstract

The application discloses a preparation method of green geopolymer based on engineering residual sludge soil, and the green geopolymer, for example, artificial stone, is prepared through a process of ingredient mixing, mud refining, ultrasonic curing, low-temperature firing and natural curing. In the application, the use amount of the curing agent is reduced by about 50% compared with the prior art under the condition of ensuring the strength of the artificial stone, the curing time of the artificial stone is shortened, the technical problem of long production cycle is solved, the enterprise cost is greatly reduced, the product quality is improved, and the advantages are remarkable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of artificial stone, and in particular to a preparation method of green geopolymer based on engineering residual mucky soil. BACKGROUND

[0002] Commercially produced geopolymer can be used for fireproof and heat-resistant coatings and adhesives, medical applications, high-temperature ceramics, new adhesives for refractory fiber composites, toxic and radioactive waste encapsulation, and new cements for concrete. In modern construction engineering, a common problem is the generation of a large amount of engineering residual mucky soil, which is usually considered as waste and needs to be properly treated. The engineering residual mucky soil can be made into green geopolymer, such as artificial stone, to reduce the consumption of natural resources. In the prior art, a preparation method of an engineering residual mucky soil artificial stone normal temperature composite curing agent is disclosed in Chinese patent application No. CN117069408A. The engineering residual mucky soil artificial stone normal temperature composite curing agent includes a liquid phase part, which is prepared by the following steps: preparing a curing agent base, adding nano titanium dioxide to the curing agent base, and forming a composite curing agent after sufficient stirring, wherein the mass ratio of the nano titanium dioxide to the curing agent base is 1%-2%, the curing agent base includes a solvent and a curing agent, the curing agent is TBPB, TBPO and MEKP in a molar ratio of 1:0.2:(0.5-2), and the mass percentage of the curing agent in the curing agent base is 45%-55%. The above curing agent has a usage of 20%-25% when making artificial stone, and has a high cost. SUMMARY

[0003] Therefore, the present application provides a preparation method of green geopolymer based on engineering residual mucky soil to solve the technical problems of large usage of curing agent and high cost of enterprises.

[0004] A preparation method of green geopolymer based on engineering residual mucky soil, comprising the following steps:

[0005] S1. preparing 5-10 parts of a composite curing agent, 55-65 parts of a semi-solid experimental soil, 10-15 parts of a dispersing agent, and 2-8 parts of a dehydrating agent, wherein the building waste is crushed and ground, mixed with fly ash in a certain proportion, crushed, sieved, baked, and organic matter and impurities are removed, and water is added and stirred to obtain the semi-solid experimental soil;

[0006] S2. stirring and mixing the semi-solid experimental soil, the composite curing agent and the dispersing agent according to the proportion; then adding the high-efficiency dehydrating agent and stirring uniformly to obtain a mixed sample soil;

[0007] S3. putting the mixed sample soil into a vacuum pug mill to pug the soil, and obtaining a sample soil mud;

[0008] S4. Pour the sample soil mud into the mold, vacuum shock, high pressure dehydration to obtain the test block;

[0009] S5. Put the test block into the ultrasonic curing tank for ultrasonic curing;

[0010] S6. Low temperature firing to obtain green geopolymer;

[0011] The composite curing agent is a normal temperature composite curing agent formed by fully stirring a curing agent base and nano titanium dioxide, the mass ratio of the nano titanium dioxide to the composite curing agent base is 1%-2%, the composite curing agent base comprises a solvent and a curing agent, the composite curing agent is TBPB, TBPO and MEKP in a molar ratio of 1:0.2:(0.5-2), and the mass percentage of the curing agent in the composite curing agent base is 45%-55%.

[0012] The high-efficiency dehydrating agent comprises inorganic matter, organic matter and surfactant in a mass ratio of (0.5-2):1:(0.5-2), the organic matter is cationic polyacrylamide, the surfactant is sodium dodecyl sulfonate, and the inorganic matter is a mixture of sodium carbonate and sodium bicarbonate in a mass ratio of 1:1.

[0013] Preferably, in the step S1, the ratio of the construction waste to the fly ash is 5:1.

[0014] Preferably, the composite curing agent is TBPB, TBPO and MEKP in a molar ratio of 1:0.2:(1-1.7).

[0015] Preferably, the diameter of the nano titanium dioxide is below 100 nm.

[0016] Preferably, the mass ratio of the inorganic matter, the organic matter and the surfactant is (0.5-1):1:(0.5-1).

[0017] Preferably, in the high-efficiency dehydrating agent, the mass ratio of the inorganic matter, the organic matter and the surfactant is 1:1:1.

[0018] Preferably, the molecular weight of the cationic polyacrylamide is 9-11 million, and the cationic concentration is 20%-60%.

[0019] Preferably, the curing in the step S5 comprises the following steps: filling curing liquid into a curing tank, the curing tank is provided with an ultrasonic wave generating assembly, immersing the test block in the curing tank, starting the ultrasonic wave generating assembly for curing, and the curing time is 0.5-10 h.

[0020] Preferably, the ultrasonic frequency of the ultrasonic wave generating assembly can be selected from 30 kHz-50 kHz, and the ultrasonic power is controlled in a range of 5000 W-6000 W.

[0021] Preferably, in the step S6, the temperature of the low-temperature firing is 40-60 DEG C, and the firing time is 2-4 hours.

[0022] The technical scheme adopted in the application can achieve the following beneficial effects:

[0023] In the application, when green geopolymer (such as artificial stone) is produced based on engineering residual sludge soil, vacuum mud conditioning and the use of a curing tank are adopted, the use amount of the curing agent is reduced by about 50% compared with the prior art under the condition that the strength of the artificial stone is unchanged, and the curing time of the artificial stone is shortened, so that the cost of the enterprise is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 Fig. 1 is a structural schematic diagram of an ultrasonic curing tank.

[0025] In the figure, the ultrasonic curing tank 110, the ultrasonic wave generating assembly 111, the curing liquid circulating assembly 112, the circulating pump 1121, the circulating pipe 1122, the filtering assembly 1123, the heat exchanging assembly 1124, the curing liquid supplement pipe 130, the liquid discharge pipe 113, the liquid supplement control valve 131, the liquid level sensor 114, and the concentration detector 115.

[0026] Specific experimental methods

[0027] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant experimental examples. The experimental examples give the preferred experimental methods of the present application. However, the present application can be realized in many different forms and is not limited to the experimental methods described herein. On the contrary, the purpose of providing these experimental methods is to make the disclosure of the present application more thorough and comprehensive.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein only for the purpose of describing the specific experimental methods, and is not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0029] The present application will be further described below in conjunction with experimental examples.

[0030] Comparative Example 1

[0031] A preparation method of an engineering residual sludge soil for making artificial stone, comprising the following raw materials prepared in parts by weight: 20 parts of a curing agent, 63.5 parts of a screened and filtered experimental soil, 12.5 parts of a dispersing agent, and 4 parts of a dehydrating agent.

[0032] The curing agent is a curing agent configured according to TBPB, TBPO and MEKP in a molar ratio of 1:0.2:0.5, the mass percentage of the curing agent is 45%, and the solvent is dimethyl phthalate, to obtain a curing agent A; the dehydrating agent is a cationic polyacrylamide.

[0033] S1. The construction waste is crushed and ground, and is mixed with fly ash at a ratio of 5:1, is crushed, sieved, baked, and has organic matter and impurities removed, and is stirred with water to obtain semi-solid experimental soil.

[0034] Table 1: Main chemical components of slag (%)

[0035]

[0036] Table 2: Property parameters of fly ash (%)

[0037]

[0038] S2. The semi-solid experimental soil, the curing agent and the dispersing agent are mixed according to the ratio, the stirring speed is 180 r / min, and the stirring time is 40 min; then the dehydrating agent is added, the stirring speed is 50 r / min, and the stirring time is 15 min.

[0039] S3. The mixed soil is poured into a mold, vacuum vibration is performed for 2 min, and a test block is prepared by high-pressure dehydration with a pressure of 15 MPa.

[0040] S4. After demolding, the test block is placed in a natural environment for curing.

[0041] After 28 days of curing, the following table is measured (d: the abbreviation of English day):

[0042] Table 3: Properties of artificial stone prepared by using curing agent A

[0043]

[0044] As shown in Table 3, the compressive strength of the artificial stone prepared by using the curing agent A is 30 MPa after 28 days of curing, the curing efficiency is low, the porosity is large, the compressive strength is low, and the production cycle of the artificial stone is too long.

[0045] Comparative Example Two

[0046] In order to improve the curing efficiency of the artificial stone in Comparative Example One, a curing agent is configured through the following experiment.

[0047] A curing agent was prepared according to a molar ratio of 1:0.2:0.5 of TBPB, TBPO and MEKP, and the mass percentage of the curing agent was 45%. The solvent was dimethyl phthalate. The curing agent A was obtained and stored in a transparent glass bottle and a brown glass bottle. The transparent glass bottle was numbered as curing agent A1, and the brown glass bottle was numbered as curing agent A2. The gas phase pressure of the curing agent A1 and the curing agent A2 at different temperatures was detected by changing the storage temperature, and the experimental results are shown in Table 4.

[0048] On the basis of the comparative example one, the temperature was kept unchanged, and the appearance of the curing agent A1 and the curing agent A2 stored for 5 days, 10 days, 30 days, 60 days and 90 days was observed, respectively. The experimental results are shown in Table 6.

[0049] Experimental example one

[0050] The application discloses a preparation method of an engineering residual soil artificial stone normal-temperature composite curing agent, and comprises the following steps: preparing a curing agent base, adding nano titanium dioxide into the curing agent base, and fully stirring to form a composite curing agent. The mass ratio of the nano titanium dioxide to the curing agent base is 1:100. The curing agent base comprises a solvent and a curing agent. The curing agent is TBPB, TBPO and MEKP with a molar ratio of 1:0.2:0.5. The mass percentage of the curing agent in the curing agent base is 45%-55%. The curing agent is poured into the solvent dimethyl phthalate, uniformly mixed and stirred, the stirring speed is 100 r / min, the stirring time is 15 min, 1% nano titanium dioxide is added, and the stirring is uniformly continued until the stirring speed is 80 r / min and the stirring time is 20 min. The curing agent B is obtained and stored in a transparent glass bottle and a brown glass bottle. The transparent glass bottle is numbered as curing agent B1, and the brown glass bottle is numbered as curing agent B2. The gas phase pressure of the curing agent B1 and the curing agent B2 is detected by changing the storage temperature, and the experimental results are shown in Table 5.

[0051] The nano titanium dioxide has a diameter of less than 100 nm, good dispersibility and weather resistance.

[0052] The TBPB is tert-Butyl peroxybenzoate, CAS No: 614-45-9; the TBPO is Tert-Butylperoxy-2-Ethylhecanoate, CAS No: 3006-82-4; the MEKP is Methyl ethyl ketone peroxide, CAS No: 1338-23-4; and the solvent is Dimethyl phthalate, which is an organic substance and can be mixed with general organic solvents.

[0053] Experimental Example Two

[0054] While keeping other conditions of Experimental Example One unchanged, 2% of nano-titanium dioxide was added to obtain a curing agent C, which was stored in a light-transmitting glass bottle and a brown glass bottle, respectively, the light-transmitting glass bottle was numbered as curing agent C1, and the brown glass bottle was numbered as curing agent C2; the storage temperature was changed respectively, and the gas phase pressure of the curing agent C1 and the curing agent C2 was detected, and the experimental results are shown in Table 5.

[0055] Experimental Example Three

[0056] On the basis of Experimental Example One and Experimental Example Two, while keeping the temperature unchanged, the appearance of the curing agent B1, the curing agent B2, the curing agent C1 and the curing agent C2 stored for 5 days, 10 days, 30 days, 60 days and 90 days was observed respectively, and the experimental results are shown in Table 6.

[0057] Table 4 Temperature and pressure change table of curing agent A

[0058]

[0059] Table 5 Temperature and pressure change table of curing agent B and C with titanium dioxide added

[0060]

[0061] Table 6 90-day change table of curing agent

[0062]

[0063] From Tables 4 and 5, it can be seen that the brown glass bottle is relatively stable in storage.

[0064] From Table 4, it can be seen that the bottle pressure of the curing agent A1 and the curing agent A2 increases at 30°C, and rapidly increases at 35°C-40°C, which proves that the bottle pressure of the curing agent increases with the increase of temperature, and the explosion risk exists when the temperature continues to rise.

[0065] From table 4, 5, it can be seen that the bottle pressure of the curing agent B1, B2, C1, C2 with 1%-2% nano-titanium dioxide changes gently with temperature, but from table 6, it can be seen that with the extension of the standing time, the curing agent changes from transparent to slightly turbid, the turbidity is serious after 30 days, flocculation appears after 60 days, and the curing agent appears stratification after 90 days.

[0066] Experimental example four

[0067] In order to solve the above-mentioned turbidity, flocculation and stratification of the curing agent, the material ratio is changed, and the experiment is as follows.

[0068] Keeping other conditions of experimental example one unchanged, the molar ratio of TBPB, TBPO, MEKP is configured according to the proportion described in the following table to prepare curing agents D1-D5, which are filled into brown glass bottles and stored at room temperature 25℃, and the appearance of the curing agents is observed respectively after 2 days, 10 days, 30 days, 60 days, 90 days and 180 days, where d represents days, and the experimental results are as follows.

[0069] Table 7 Molar ratio change table

[0070]

[0071]

[0072] From table 7, it can be seen that when the molar ratio of TBPB, TBPO, MEKP is 1:0.2:0.8, the curing agent composition is found to be slightly turbid after 10 days, flocculation appears after 60 days, and stratification appears after 90 days; when the molar ratio of TBPB, TBPO, MEKP is changed to 1:0.2:1, flocculation appears after 90 days, and stratification appears after 180 days, and the state of the curing agent is obviously improved by increasing the amount of MEKP; further increasing the amount of MEKP, from table 7, it can be seen that when the molar ratio of TBPB, TBPO, MEKP is changed to 1:0.2:1.7, slight turbidity appears after 180 days; further experiment, when the molar ratio of TBPB, TBPO, MEKP is changed to 1:0.2:2, the curing agent remains transparent, and no flocculation or stratification appears, and the curing agent is stable at room temperature with the passage of time.

[0073] Experimental example five

[0074] Keeping other conditions of comparative example one unchanged, artificial stone X1-X4 is prepared by using the above-mentioned curing agent, and the compressive strength of the artificial stone is observed respectively after 3 days, 5 days, 7 days and 10 days as follows.

[0075] Table 8 Compressive strength of artificial stone (MPa) and porosity (%)

[0076]

[0077]

[0078] From Table 1 and Table 8, under the same preparation steps, Table 1 is without the addition of nano-titanium dioxide curing agent A, the compressive strength of the artificial stone prepared after curing for 28 days is 30 MPa, the curing efficiency is low; Table 8 is a new configuration of adding inorganic nano-titanium dioxide curing agent D1-D5, the compressive strength of the artificial stone prepared is significantly improved, the compressive strength at the 10th day has reached more than 30 MPa, the curing efficiency is significantly improved, but the porosity is larger, the dehydration effect is not good, and the problem of low curing efficiency in Comparative Example 1 is solved.

[0079] To solve the problem of large porosity and low compressive strength in Comparative Example 1, the dehydrating agent is reconfigured, for example as follows.

[0080] Experimental Example Six

[0081] To improve the large porosity and low compressive strength of the artificial stone in Comparative Example 1, the curing agent is configured through the following experiments.

[0082] An engineering residual sludge soil artificial stone deep efficient dehydrating agent, comprising inorganic matter, organic matter and surfactant, the organic matter is cationic polyacrylamide, the surfactant is sodium dodecyl sulfonate, the inorganic matter is a mixture of sodium carbonate and sodium bicarbonate with a mass ratio of 1:1, the molecular weight of the cationic polyacrylamide is 9-11 million, and the cationic concentration is 20%-60%.

[0083] The inorganic matter sodium carbonate, sodium bicarbonate, surfactant sodium dodecyl sulfonate, and cationic polyacrylamide are configured according to the proportions described in the following table to obtain dehydrating agents T1-T16.

[0084] Table 9 Comparative Example Dehydrating Agent Proportion Composition Table

[0085]

[0086]

[0087] Experimental Example Seven

[0088] The other conditions of Comparative Example 1 are kept unchanged, and the dehydrating agents T1-T16 configured in Experimental Example Six are used to prepare artificial stone test blocks Y1-Y16, respectively.

[0089] After natural curing for 28 days, the porosity and compressive strength of the artificial stone test blocks Y1-Y16 are detected, the porosity is calculated using the following formula, and the compressive strength is tested by loading the test block on an electronic universal testing machine, the machine is loaded at a speed of 0.02 mm / s until the test piece is destroyed, and the maximum compressive failure load is recorded.

[0090] The formula for calculating the porosity P of the artificial stone is:

[0091] P - porosity of the artificial stone, %;

[0092] V0 - volume of the material in the natural state, or apparent volume, cm 3 or m 3 ; p0 is the bulk density of the raw material, g / cm 3 or kg / m 3 ;

[0093] V - absolute compacted volume of the material, cm 3 or m 3 ; p is the density of the artificial stone, g / cm 3 or kg / m 3 .

[0094]

[0095] Table 10 Porosity and compressive strength of artificial stone after curing for 28 days

[0096]

[0097] From Tables 9 and 10, it can be seen that, under the same preparation steps, when the artificial stone is prepared only with cationic polyacrylamide in Experimental Example 1, the porosity is relatively large and the compressive strength is relatively low; when the artificial stone is prepared by adding inorganic sodium carbonate, sodium bicarbonate or surfactant sodium dodecyl sulfonate on the basis of cationic polyacrylamide, the porosity and compressive strength change little, and even if the ratio of the inorganic substance or surfactant sodium dodecyl sulfonate is changed, the porosity and compressive strength still change little; when cationic polyacrylamide, inorganic substance and sodium dodecyl sulfonate are used simultaneously with a mass ratio of 1:0.5:0.5, the porosity of the artificial stone prepared thereby is reduced and the compressive strength is increased, but when the mass ratio of cationic polyacrylamide, inorganic substance and sodium dodecyl sulfonate is 1:2:2, the porosity of the artificial stone prepared thereby is increased and the compressive strength is reduced.

[0098] In summary, the porosity and the compressive strength are inversely proportional to each other, the lower the porosity of the artificial stone, the higher the compressive strength, and vice versa. The best improvement effect is achieved when the mass ratio of cationic polyacrylamide, inorganic substance and sodium dodecyl sulfonate is 1:1:1, the porosity of the artificial stone sample reaches 0.156% after natural curing for 28 days, and the compressive strength can reach 40 MPa.

[0099] From the above experimental example one to experimental example seven, it can be seen that when the other conditions of the comparative example one are kept unchanged, the curing efficiency of the artificial stone prepared by the experimental example using the newly prepared curing agents D1-D5 is significantly improved, but the porosity is too large; when the other conditions of the comparative example one are kept unchanged, the porosity of the artificial stone prepared by the experimental example using the newly prepared dehydrating agents T8-T16 is significantly reduced, and the compressive strength is increased, but the cycle of making the artificial stone is too long. In order to solve this problem, the optimal proportion of curing agent and dehydrating agent is used to make artificial stone, and the experiment is as follows.

[0100] Experimental example eight

[0101] The other conditions of the comparative example one are kept unchanged, the curing agent is D5 in experimental example four, and the dehydrating agent is T12 in experimental example six, and the performance of the artificial stone is as follows:

[0102] Table 11 Performance of artificial stone prepared by using curing agent A

[0103]

[0104] From table 11, it can be seen that the porosity of the artificial stone prepared by using the new curing agent D5 and dehydrating agent T12 is significantly reduced after 15 days of curing, and the compressive strength reaches 37.4MPa, which meets the performance standard of artificial stone, shortens the delivery time, reduces the cost, improves the product quality, and has obvious advantages.

[0105] Although the artificial stone prepared in experimental example eight has improved porosity and compressive strength, the consumption of curing agent is large, accounting for 20%-25%, which makes the enterprise cost higher, and the manufacturing process needs to be further improved.

[0106] Experimental example nine

[0107] A preparation method of green geopolymer based on engineering residual sludge soil, comprising the following raw materials prepared by weight parts: 10 parts of curing agent, 63.5 parts of screened and filtered experimental soil, 12.5 parts of dispersing agent, and 4 parts of dehydrating agent, and the following process is used to make.

[0108] The building waste is crushed and ground, and the fly ash is mixed according to the ratio of 5:1, crushed, sieved, baked, and the organic matter and impurities are removed, and the semi-solid experimental soil is obtained by adding water and stirring.

[0109] The semi-solid experimental soil, the curing agent and the dispersing agent are mixed according to the proportion, the stirring speed is 180r / min, and the stirring time is 40min; then the dehydrating agent is added, the stirring speed is 50r / min, and the stirring time is 15min, and the mixed sample soil is prepared.

[0110] The mixed sample soil is put into a vacuum pug mill to pug, and 20 times of vacuum pugging is carried out at a pressure of 50 MPa to obtain sample soil mud.

[0111] The sample soil mud is poured into a mold, and after vacuum vibration for 2 min, a test block is prepared by high-pressure dehydration at a pressure of 15 MPa.

[0112] The curing liquid is filled into the curing tank, the curing tank is provided with an ultrasonic wave generating assembly, the test block is immersed in the curing tank, the ultrasonic wave generating assembly is started to cure, the curing time is 5 h, the ultrasonic wave generating assembly further comprises an ultrasonic frequency of 40 kHz, and the ultrasonic power is controlled at about 6000 W.

[0113] Green geopolymer, for example artificial stone, is obtained by low-temperature firing, the temperature of low-temperature firing is 50 DEG C, the firing time is 10 h, and curing is carried out in a natural environment.

[0114] Table 12 shows the performance of the artificial stone prepared in Experimental Example Nine.

[0115]

[0116] As shown in Table 12, after the improved process, the compressive strength of the artificial stone is increased, the porosity is reduced, and the curing time of the artificial stone is reduced to 10 days.

[0117] In another preferred embodiment of the present application, a curing method for optimizing artificial stone is also provided, which adopts an artificial stone curing device for curing by ultrasonic wave, greatly reduces the curing time of the artificial stone, and the specific implementation is as follows.

[0118] The curing method for artificial stone comprises an artificial stone efficient curing device, the device is provided with an ultrasonic curing tank 110, the ultrasonic curing tank 110 is filled with curing liquid, at least one ultrasonic wave generating assembly 111 is arranged in the ultrasonic curing tank 110, the ultrasonic wave generating assembly 111 is used to form vibration wave, and the vibration wave can propagate in the curing liquid.

[0119] The cross section of the ultrasonic curing tank 110 is generally rectangular, and the cross section can also be circular, oval, triangular or polygonal. The specific shape and size such as length and width can be selected according to the shape of the inorganic ecological stone and the scale of the inorganic ecological stone to be cured in each batch. The curing liquid can be a commercially available concrete curing liquid or a curing liquid prepared according to the process requirements. Different curing liquids have a certain effect on the curing time of the inorganic ecological stone, but regardless of the curing liquid, experiments show that the curing period of the inorganic ecological stone can be controlled within 0.5h-10h, which greatly shortens the curing period of the inorganic ecological stone and improves the production efficiency of the inorganic ecological stone. Further, a curing liquid storage tank or tank can be provided to facilitate the supply of curing liquid to the ultrasonic curing tank 110.

[0120] In use, the inorganic ecological stone is immersed in the curing tank, and the ultrasonic wave generating assembly 111 is started. The generated ultrasonic waves propagate in the curing liquid and penetrate the inorganic ecological stone, improving the penetration rate of the curing liquid. In principle, the higher the ultrasonic frequency, the longer the ultrasonic time, and the greater the ultrasonic power, the higher the curing efficiency of the inorganic ecological stone, and the better the mechanical properties of the inorganic ecological stone. However, considering energy saving and cost control, the ultrasonic time is generally controlled within 30min-720min, the ultrasonic frequency can be selected as 40kHz, and the ultrasonic power is controlled around 6000W.

[0121] In some specific embodiments, at least one ultrasonic wave generating assembly 111 is arranged in the side wall of the ultrasonic curing tank 110. The vibration wave generated by the ultrasonic wave generating assembly 111 can cover at least the placement area of the inorganic ecological stone in the ultrasonic curing tank 110. The vibration wave generated by the ultrasonic wave generating assembly 111 propagates horizontally along the cross section direction of the ultrasonic curing tank 110, thereby penetrating the inorganic ecological stone from front to back and improving the penetration rate of the curing liquid. As a preferred embodiment, the ultrasonic wave generating assembly 111 comprises an ultrasonic wave generator and an ultrasonic vibration plate, and the ultrasonic vibration plate can generate vibration waves for curing the inorganic ecological stone.

[0122] In yet another specific embodiment, a pressure-resistant wear-resistant plate is arranged on the bottom surface of the ultrasonic curing tank 110. In some cases, the bottom of the inorganic ecological stone is provided with a tray made of PVC material or the like. At this time, the ultrasonic wave generating assembly 111 needs to be arranged in the side wall of the ultrasonic curing tank 110, and the vibration wave propagates along the cross section direction parallel to the curing tank and covers the height direction of the inorganic ecological stone placement area.

[0123] Further, the ultrasonic curing tank 110 is provided with a heating assembly for heating the curing liquid in the ultrasonic curing tank 110. Experiments show that, in order to increase the compressive strength of the inorganic ecological stone and reduce the water absorption rate of the inorganic ecological stone, the ultrasonic treatment and the heat treatment are simultaneously performed when the curing liquid is subjected to the penetration treatment, which has a good synergistic effect and can further improve the curing efficiency of the inorganic ecological stone and optimize the mechanical property parameters of the inorganic ecological stone. In a specific embodiment, the heating assembly includes an electric heating element or a steam heating element arranged in the curing tank, for example, the heating assembly is an electric heating wire arranged at the bottom of the curing tank, or a steam coil arranged at the bottom of the curing tank, or hot air, steam or hot water is directly blown into the curing tank.

[0124] In the ultrasonic curing tank 110, a curing liquid supplement pipe 130 is arranged, and a liquid supplement control valve 131 is arranged on the curing liquid supplement pipe 130. The curing liquid supplement pipe 130 is used to add or supplement the curing liquid in the curing tank according to the actual production condition. Preferably, a liquid discharge pipe 113 is arranged at the bottom of the curing tank to discharge the old curing liquid in the curing tank, and the new curing liquid is added through the curing liquid supplement pipe 130.

[0125] In some other embodiments, a liquid level sensor 114 is arranged in the ultrasonic curing tank 110, and the liquid level sensor 114 is electrically connected with the liquid supplement control valve 131 and used to automatically supplement the curing liquid in the ultrasonic curing tank 110. When the concentration or liquid level of the curing liquid cannot meet the process requirement, the liquid supplement control valve 131 is automatically opened to supplement the curing liquid.

[0126] In some preferred embodiments, a curing liquid circulation assembly 112 is arranged on the ultrasonic curing tank 110, the curing liquid circulation assembly 112 includes a circulation pump 1121 and a circulation pipe 1122 connected to the outlet end of the circulation pump 1121, the inlet of the circulation pump 1121 is arranged at the lower part of the ultrasonic curing tank 110, and the outlet end of the circulation pipe 1122 is arranged at the upper part of the ultrasonic curing tank 110. During or after the curing of the inorganic ecological stone, the curing liquid at the bottom of the ultrasonic curing tank 110 is circulated to the upper part of the ultrasonic curing tank 110 through the circulation pump 1121 and the circulation pipe 1122, so as to maintain the uniformity of the curing liquid in the ultrasonic curing tank 110. Further, the circulation pipe 1122 is provided with a filtering assembly 1123 for filtering the impurities in the curing liquid. During the circulation of the curing liquid, the impurities such as inorganic ecological stone residues are filtered to maintain the purity of the curing liquid.

[0127] As preferred, the circulating pipe 1122 is provided with a heat exchange component 1124 for heating the curing solution in the ultrasonic curing tank 110. At this time, the curing solution can be heated to the process temperature by the heat exchange component 1124 provided on the circulating pipe 1122. The heat exchange component 1124 provided on the circulating pipe 1122 can provide heat for the curing solution as a heating component, or supplement heat for the curing solution as a supplement of the heating component.

[0128] In some specific embodiments, the ultrasonic curing tank 110 is provided with a concentration detector 115 for detecting the concentration of the curing solution, and the concentration detector 115 is electrically connected with the liquid level sensor 114 and the liquid supplement control valve 131. In the curing process of the inorganic ecological stone, when there is too much inorganic ecological stone to be cured, the concentration of the curing solution may decrease, or when the surface of the inorganic ecological stone is too dry, the concentration of the curing solution may increase. Therefore, it is necessary to control the concentration of the curing solution to ensure the curing quality of the inorganic ecological stone. Therefore, the ultrasonic curing tank 110 can be provided with a concentration detector 115 for detecting the concentration of the curing solution, which can detect the concentration of the curing solution and automatically control the liquid supplement control valve 131 and the liquid discharge pipe 113 in cooperation with the liquid level sensor 114, so as to supplement the liquid in the ultrasonic curing tank 110 in time or discharge the curing solution in the ultrasonic curing tank 110 in time when the concentration is too high. The ultrasonic curing tank 110 contains the curing solution, and is provided with at least one ultrasonic component. The ultrasonic component can provide vibration waves, and when the vibration waves propagate in the curing solution, countless micro vacuum bubbles are generated in the curing solution. When the vacuum bubbles are broken under pressure, a strong impact is generated on the artificial ecological stone. Experiments show that the curing period of the inorganic ecological stone is shortened to 0.5-10h by using the ultrasonic wave to cure the inorganic ecological stone in the curing solution, which has the beneficial effect of shortening the curing period of the inorganic ecological stone.

[0129] The curing of the artificial stone by the above method only needs 0.5-10h, and the effect is better on the basis of selecting or using a suitable curing solution, which greatly improves the curing efficiency and saves the curing time.

[0130] The above experimental examples only express the device layout method of the present application, which is described in detail, but it cannot be understood as a limitation on the scope of the patent application; it should be pointed out that for ordinary skilled persons in the art, some adjustments and improvements can be made without departing from the concept of the present application, which are within the scope of the present application; therefore, the protection scope of the patent application should be subject to the appended claims.

Claims

1. A method for preparing an engineering slurry-based green geopolymer, characterized by, The method comprises the following steps: S1. Preparing 5-10 parts of composite curing agent, 55-65 parts of semi-solid experimental soil, 10-15 parts of dispersing agent, and 2-8 parts of dehydrating agent, wherein the construction waste is crushed and ground with fly ash in a certain proportion, crushed, sieved, baked, and organic matter and impurities are removed, and water is added and stirred to obtain the semi-solid experimental soil; S2. Stir and mix the semi-solid experimental soil, the composite curing agent, and the dispersing agent according to the proportion; then add the dehydrating agent and stir uniformly to obtain a mixed sample soil; S3. Put the mixed sample soil into a vacuum pug mill to pug, and obtain a sample soil mud; S4. Pour the sample soil mud into a mold, vacuum shake, and high-pressure press to dehydrate to obtain a test block; S5. Put the test block into an ultrasonic curing tank, fill the curing liquid into the tank, and set an ultrasonic wave generating assembly in the tank. Submerge the test block in the curing liquid, start the ultrasonic wave generating assembly for curing, and the curing time is 0.5-10 hours. The ultrasonic frequency of the ultrasonic wave generating assembly is 30-50 kHz, and the ultrasonic power is controlled at 5,000-6,000 W. The ultrasonic curing tank is also provided with a curing liquid circulating assembly, a liquid discharge pipe, a liquid level sensor, and a concentration detector; S6. Low-temperature firing to obtain a green geopolymer, and the low-temperature firing temperature is 40-60℃, and the firing time is 2-4 hours. The composite curing agent is a room temperature composite curing agent formed by fully stirring a curing agent base and nano titanium dioxide, the mass ratio of the nano titanium dioxide to the curing agent base is 1-2%, the curing agent base comprises a solvent and a curing agent, the curing agent in the curing agent base is TBPB, TBPO, and MEKP in a molar ratio of 1:0.2:(0.5-2), and the mass percentage of the curing agent in the curing agent base is 45-55%. The dehydrating agent comprises inorganic matter, organic matter, and a surfactant in a mass ratio of (0.5-2):1:(0.5-2), the organic matter is cationic polyacrylamide, the surfactant is sodium dodecyl sulfonate, and the inorganic matter is a mixture of sodium carbonate and sodium bicarbonate in a mass ratio of 1:

1.

2. The method for preparing an engineering sludge-based green geopolymer according to claim 1, characterized in that, In step S1, the ratio of the construction waste to the fly ash is 5:

1.

3. The method for preparing an engineering sludge-based green geopolymer according to claim 1, characterized in that, The curing agent in the curing agent base is TBPB, TBPO, and MEKP in a molar ratio of 1:0.2:(1-1.7).

4. The method for preparing an engineering sludge-based green geopolymer according to claim 1, characterized in that, The nano titanium dioxide has a diameter of less than 100 nm.

5. The method of claim 1, wherein the green geopolymer based on engineered sludge soil is characterized by, The mass ratio of the inorganic matter, the organic matter, and the surfactant is (0.5-1):1:(0.5-1).

6. The method of claim 1, wherein the green geopolymer based on engineered sludge soil is characterized by, In the dehydrating agent, the mass ratio of the inorganic matter, the organic matter, and the surfactant is 1:1:

1.

7. The method of claim 1, wherein the green geopolymer based on engineered sludge soil is characterized by, The cationic polyacrylamide has a molecular weight of 9-11 million and a cationic concentration of 20-60%.

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