A method for rapid treatment of waste mortar blocks

Abstract

The present application relates to a kind of quick processing method of waste mortar block, belong to solid waste resource utilization and atmospheric pollution control technical field.The method includes: waste mortar block is broken and ground, and mixed with chemical activator and carries out ball milling activation, then calcination is carried out at 550 DEG C-700 DEG C, realize heat, mechanical force and chemical ternary activation;The obtained activated powder is modified by surface hydroxyl group after hydrogen peroxide, dispersed in organic solvent, add tetrabutyl titanate and carry out in situ hydrolysis condensation, generate nanometer titanium dioxide on the surface of powder;Finally granulation forming, photocatalytic functional material is obtained.The material obtained by the present application has alkaline surface chemical adsorption and nanometer titanium dioxide photocatalytic degradation function, and can be used for low concentration NOx and VOCs photocatalytic purification, realizes the high value-added rapid resource utilization of waste mortar block, and has good economic and environmental benefits.

Description

Technical Field

[0001] This invention relates to the field of solid waste resource utilization and air pollution control technology, specifically to a rapid treatment method for waste mortar blocks. Background Technology

[0002] Waste mortar blocks are discarded blocks generated during the production and construction of aerated concrete blocks.

[0003] Currently, the mainstream treatment method for waste mortar blocks is physical crushing and use as low-value-added filler or aggregate. However, there is insufficient economic incentive to crush waste mortar blocks into recycled fine aggregate for use in masonry mortar. Combining the resource utilization of solid waste with photocatalytic technology has become an important direction in the research of environmental functional materials.

[0004] Studies have shown that the main phase of waste mortar block powder is low-calcium-silicon hydrated calcium silicate (CSH). Both grinding and calcination processes can improve the cementitious activity of waste mortar blocks, with calcination promoting the transformation of CSH into cementitious β-C2S crystals. However, existing activation technologies are mostly single thermal or mechanical activation, and there is still room for optimization in activation efficiency and energy consumption. Although previous studies have shown that mechanical, thermal, and chemical activation can synergistically enhance the activity of regenerated micro-powders, a systematic study of a ternary synergistic activation system for waste mortar blocks has not yet been found.

[0005] Existing technologies have attempted to use recycled red brick sand and recycled glass sand as supports for nano-titanium dioxide to prepare composite photocatalyst mortar panels for degrading harmful gases in the air. Studies have shown that the NOx removal efficiency of recycled aggregate-based photocatalytic mortar treated with nano-titanium dioxide can reach approximately 90.75%. Other studies have used recycled waste concrete powder as a support for nano-titanium dioxide, confirming its feasibility. However, these technologies primarily use construction waste as an inert support, failing to fully utilize its potential chemical activity. The potential of the alkaline surface of waste mortar blocks for adsorbing acidic pollutants remains untapped. Nano-titanium dioxide tends to agglomerate on the support surface and has weak bonding with the matrix. Although studies have shown that stable Ti-O-Si chemical bonds can be established between the recycled aggregate surface and nano-titanium dioxide through hydroxylation treatment, existing technologies mostly employ physical mixing or simple impregnation methods for loading, lacking a systematic in-situ loading process design. This poses a risk of photocatalyst detachment during long-term use, affecting the material's durability.

[0006] Existing resource utilization of waste mortar mainly focuses on low-value fillers or recycled aggregates. There is no technical solution that can achieve integrated and rapid processing of crushing and grinding, activation and modification, functional loading and molding and granulation, and transform it into high-value-added environmental functional materials with both adsorption and photocatalytic functions. Summary of the Invention

[0007] To address the shortcomings of the existing technology, the present invention provides a rapid treatment method for waste mortar blocks.

[0008] The technical solution adopted by this invention to solve its technical problem is as follows: This invention provides a rapid treatment method for waste mortar blocks, comprising the following steps: Step 1: The waste mortar blocks are sequentially crushed by a jaw crusher, then by a hammer crusher, and finally by a vertical roller mill to obtain fine powder with a particle size ≤0.075mm.

[0009] Step 2: Place the fine powder obtained in Step 1 into a planetary ball mill, add 1% to 3% of a chemical activator by mass of the powder, and ball mill at a speed of 300 to 500 r / min for 30 to 90 min. Then place the activated powder in a muffle furnace and calcine at 550℃ to 700℃ for 30 to 60 min, and cool with the furnace to obtain the activated powder.

[0010] Through this step, the low-calcium silicate (CSH) portion of the waste mortar block powder is dehydrated and transformed into β-C2S crystals with gelling activity. Simultaneously, the alkaline environment provided by the chemical activator promotes the recombination and dissolution of the aluminosilicate structure. The synergistic effect of these three factors significantly increases the surface active sites of the powder. Compared to single thermal activation, which typically requires temperatures above 800℃, the activation temperature of this invention is 550℃~700℃, significantly lower, offering energy-saving advantages.

[0011] Step 3: Disperse the activated powder obtained in Step 2 in deionized water, add 2%~5% hydrogen peroxide by weight of the powder, and stir at 60℃~80℃ for 1~3 hours. Filter, wash, and dry to obtain modified powder with hydroxyl-rich surface.

[0012] The purpose of surface hydroxylation modification is twofold: firstly, hydroxyl groups provide chemical anchoring sites for the subsequent in-situ loading of nano-titanium dioxide; secondly, surface hydroxyl groups endow the material with stronger polarity, enhancing its adsorption affinity for polar pollutants such as NOx, SO2, and formaldehyde.

[0013] Step 4: Disperse the modified powder obtained in Step 3 in anhydrous ethanol, add tetrabutyl titanate and glacial acetic acid, and stir at room temperature for 2-4 hours. Then, slowly add deionized water and continue stirring for 1-2 hours to allow the tetrabutyl titanate to hydrolyze and condense in situ on the powder surface, generating nano-titanium dioxide particles that are firmly loaded onto the powder surface. The product is centrifuged, washed, and dried at 80℃-105℃ to obtain the composite powder loaded with nano-titanium dioxide.

[0014] Compared with simple physical mixing or impregnation methods, the in-situ loading method results in stronger bonding between nano-titanium dioxide and the carrier surface through Ti-O-Si or Ti-O-Ca chemical bonds, making it less prone to detachment.

[0015] Step 5: Place the composite powder obtained in Step 4 into a disc granulator, and spray in a composite binder solution accounting for 5%~10% of the total mass of the powder to granulate and obtain spherical particles with a particle size of 2~6mm. Dry the particles at 80℃~105℃ for 4~8h to obtain the finished product.

[0016] The photocatalytic functional particles obtained in this invention have the following structural features: Particle morphology: spherical or nearly spherical, with a particle size of 2~6mm, exhibiting good flowability and filling properties; Surface properties: The surface is rich in hydroxyl groups and basic sites, which gives it the ability to chemically adsorb acidic gases such as NOx; Photocatalytic activity: The surface is uniformly loaded with nano-titanium dioxide particles, which can efficiently photocatalytically degrade pollutants such as NOx and VOCs under ultraviolet light or sunlight irradiation; Carrier activity: The activated waste mortar block powder has gelling activity, and the particles themselves have a certain mechanical strength.

[0017] The material of this invention can be used as a packing material in a fixed-bed photocatalytic reactor for the photocatalytic degradation of low-concentration NOx and / or VOCs. In use, the composite functional particles are filled into a transparent fixed-bed reactor, and NOx-containing waste gas is introduced from the bottom of the reactor. NOx in the waste gas is first chemically adsorbed and enriched by alkaline sites on the particle surface. Under ultraviolet light or sunlight irradiation, the nano-titanium dioxide loaded on the surface is excited to generate photogenerated electron-hole pairs, oxidizing the adsorbed NOx to NO3. - Ultimately, it is fixed on the particle surface in the form of nitrates or discharged with the flushing water.

[0018] When the photocatalytic efficiency of the material drops below 60% of its initial value, it is regenerated by rinsing with deionized water for 10-20 minutes followed by drying. The initial value refers to the removal rate after the photocatalytic material has been used for the first time and the light irradiation has stabilized, i.e., after 30 minutes of light irradiation. When the photocatalytic efficiency of the material drops below 60% of this initial value, it is regenerated by rinsing with deionized water for 10-20 minutes followed by drying.

[0019] The beneficial effects of this invention are that it integrates the chemical adsorption and photocatalytic functions of waste mortar blocks into a single material. The waste mortar blocks serve as both a photocatalyst carrier and a medium for adsorbing and enriching pollutants, first adsorbing and enriching them, then photocatalytically degrading them, effectively solving the problem of low photocatalytic degradation efficiency for low-concentration pollutants. The use of a ternary activation technology combining heat, mechanical force, and chemical activation significantly improves activation efficiency compared to single thermal or mechanical activation. The activation temperature is controlled at 550℃~700℃, far lower than the traditional thermal activation temperature of over 800℃, resulting in significant energy-saving advantages. The in-situ hydrolysis and condensation method using tetrabutyl titanate allows nano-titanium dioxide to be firmly loaded onto the carrier surface through chemical bonds Ti-O-Si and Ti-O-Ca, resulting in stronger bonding, less detachment, and a longer material lifespan compared to physical mixing or impregnation methods. Hydrogen peroxide treatment introduces a large number of hydroxyl groups onto the carrier surface, providing chemical anchors for the in-situ loading of nano-titanium dioxide and enhancing the surface's adsorption affinity for polar pollutant gases. This invention uses waste mortar blocks as the sole raw material, achieving high-value utilization of construction waste and providing a new resource-based approach for waste mortar blocks that differs from low-value fillers. The entire processing technology is simple to operate, uses conventional equipment, and is suitable for large-scale industrial production. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a process flow diagram of a rapid treatment method for waste mortar blocks according to the present invention.

[0022] Figure 2 This is a schematic diagram of the microstructure of the photocatalytic functional material of the present invention.

[0023] Figure 3 This is a schematic diagram illustrating the application of the material of this invention in fixed-bed photocatalytic reactions. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto. The raw materials used in the following embodiments are all commercially available products, the waste mortar blocks used are waste blocks produced by an aerated concrete block factory, and the Na2SiO3 used is anhydrous solid powder.

[0025] Example 1 Reference Figure 1The preparation process shown involves taking 10 kg of waste mortar blocks, which are then sequentially crushed into coarse particles (≤30 mm) using a jaw crusher, medium particles (≤10 mm) using a hammer crusher, and finely ground into fine particles (≤0.075 mm) using a vertical roller mill to obtain fine powder. The particle size of ≤0.075 mm is chosen because this fineness is comparable to that of cement, which facilitates uniform contact and reaction between the chemical activator and the powder during subsequent ball milling activation. Furthermore, powders within this particle size range have a suitable specific surface area, providing sufficient adhesion sites for the loading of nano-titanium dioxide without causing severe particle agglomeration and difficulties in subsequent granulation due to excessive fineness.

[0026] The obtained fine powder was placed in a planetary ball mill, and a chemical activator accounting for 2% of the powder mass was added. This chemical activator was a mixture of NaOH and anhydrous solid powder Na2SiO3 in a mass ratio of 2:1. The mixture was ball-milled at 400 rpm for 60 minutes. Subsequently, the activated powder was placed in a muffle furnace and calcined at 650 degrees Celsius for 45 minutes, followed by furnace cooling to obtain the activated powder.

[0027] The activated powder was dispersed in deionized water at a solid-liquid ratio of 1:8. Hydrogen peroxide, accounting for 3% of the powder's mass, was added, and the mixture was stirred at 70°C for 2 hours. After filtration, washing, and drying at 80°C, a modified powder rich in hydroxyl groups was obtained.

[0028] The modified powder was dispersed in anhydrous ethanol at a solid-liquid ratio of 1:4. Tetrabutyl titanate and glacial acetic acid were added, with tetrabutyl titanate accounting for 10% of the powder mass and the molar ratio of glacial acetic acid to tetrabutyl titanate being 1:1. The mixture was stirred at room temperature for 3 hours. Subsequently, deionized water was slowly added dropwise at a rate of approximately 1 ml per minute, with a molar ratio of water to tetrabutyl titanate of 3:1, and stirring continued for 1.5 hours. After centrifugation, washing, and drying at 90°C, the composite powder loaded with nano-TiO2 was obtained. The amount of tetrabutyl titanate was selected to be 5% to 15% of the powder mass because below 5%, the nano-TiO2 loading on the carrier surface is insufficient, resulting in too few photocatalytic active sites and low degradation efficiency; above 15%, the nano-TiO2 particles are prone to agglomeration on the carrier surface, clogging the carrier pores and reducing photocatalytic efficiency. The molar ratio of water to tetrabutyl titanate is controlled between 2:1 and 4:1 to ensure that tetrabutyl titanate is fully hydrolyzed and condensed to generate anatase nano-TiO2.

[0029] The composite powder is placed in a disc granulator, and a composite binder solution accounting for 8% of the total powder mass is sprayed in. This binder is a solution prepared by mixing water glass and polyvinyl alcohol in a mass ratio of 3:1, with a solid content of 8%. Granulation yields spherical particles with a diameter of 3 to 5 mm. After drying at 95 degrees Celsius for 6 hours, the photocatalytic functional material is obtained. The binder addition amount is selected to be 5% to 10% of the powder mass because below 5%, particle forming is difficult, mechanical strength is insufficient, and it is easy to pulverize and break during use; above 10%, the binder will block the pores on the material surface, cover the active sites, and reduce adsorption and photocatalytic performance.

[0030] Example 2 The process is basically the same as in Example 1, except that: in step 2, the activation temperature is 700 degrees Celsius and the activation time is 30 minutes; the amount of chemical activator added is one percent of the powder mass; in step 4, the amount of tetrabutyl titanate is eight percent of the powder mass; and the molar ratio of glacial acetic acid to tetrabutyl titanate is 0.5:1.

[0031] Example 3 The process is basically the same as in Example 1, except that: in step 2, the ball mill activation speed is 300 revolutions per minute and the time is 90 minutes; in step 3, the amount of hydrogen peroxide added is 5% of the powder mass, the treatment temperature is 60 degrees Celsius, and the treatment time is 3 hours; in step 5, the amount of binder added is 10% of the total powder mass, and the granulation particle size is 2 to 4 mm.

[0032] Example 4 The process is basically the same as in Example 1, except that: in step 2, the ball mill activation speed is 500 rpm and the time is 30 minutes; in step 3, the amount of hydrogen peroxide added is 2% of the powder mass, the treatment temperature is 80 degrees Celsius, and the treatment time is 1 hour; in step 5, the amount of binder added is 5% of the total powder mass, and the granulation particle size is 4 to 6 mm.

[0033] Compare with Example 1 The process is basically the same as in Example 1, except that in step 2, no chemical activator is added and no ball milling activation is performed. Instead, the fine powder is calcined at 650 degrees Celsius for 45 minutes, which is a single thermal activation.

[0034] Compare with Example 2 The process is basically the same as in Example 1, except that step 3 is omitted and the activated powder is directly loaded with nano-TiO2 without undergoing hydrogen peroxide modification.

[0035] Compare with Example 3 The process is basically the same as in Example 1, except that in step 4, in-situ hydrolysis and condensation of tetrabutyl titanate is not used. Instead, commercially available nano-TiO2 powder with an average particle size of 25 nm is physically ball-milled with modified powder at a mass ratio of 10:100. The ball milling speed is 200 rpm and the time is 30 minutes.

[0036] Figure 3 The direction of the middle arrow indicates the gas flow direction, see reference. Figure 3 The application method shown involves filling the test material into a fixed-bed photocatalytic reactor to a height of 20 cm. The inner diameter of the reaction tube is 5 cm. Simulated air containing NO is introduced, with an initial NO concentration of 500 ppb and a flow rate of 1 liter per minute. Under 365 nm UV lamp irradiation (8 W), the outlet NO concentration is continuously monitored using a chemiluminescence NO-NO2-NOx analyzer. After the reaction stabilizes (30 minutes of irradiation), the outlet NO concentration at that moment is recorded as the basis for calculating the stable removal rate. The NO removal rate is calculated using the following formula: NO removal rate equals the inlet NO concentration minus the outlet NO concentration, divided by the inlet NO concentration, and multiplied by 100%. Here, the inlet NO concentration is in ppb, and the outlet NO concentration refers to the outlet NO concentration after 30 minutes of irradiation, also in ppb.

[0037] When the NO removal rate of the material drops below 60% of its initial value, the material is removed from the reactor, rinsed with deionized water for 15 minutes, dried at 105 degrees Celsius for 4 hours, and then refilled. The NO removal rate after 30 minutes of light exposure is tested again using the same method, and this cycle is repeated multiple times. The initial value here refers to the NO removal rate when the material is first used and the light exposure is stable for 30 minutes.

[0038] The NO removal rates of the materials obtained from each embodiment and the control example are shown in the table below.

[0039] Table 1 NO removal rates of materials obtained from each embodiment and control example As shown in Table 1: First, the initial NO removal rate of Example 1 reached 83.0%, significantly higher than the 52.3% of Control Example 1, indicating that the ternary activation of heat, mechanical force, and chemical force significantly improved the photocatalytic performance of the material compared with single heat activation. This is because ternary activation significantly increased the active sites on the support surface, which is beneficial to the uniform loading of nano-TiO2 and the surface adsorption and enrichment of pollutants. Second, the initial NO removal rate of Example 1 (83.0%) was significantly higher than the 61.5% of Control Example 2, indicating that surface hydroxylation modification plays a key role in improving photocatalytic performance. The surface hydroxyl groups introduced by hydrogen peroxide treatment provide chemical anchoring sites for nano-TiO2, improving the loading firmness and dispersibility; on the other hand, it enhances the adsorption affinity of the surface for polar NO gas, promoting adsorption, enrichment, and photocatalytic effects. Third, the initial NO removal rate of Example 1 (83.0%) was significantly higher than the 58.7% of Control Example 3, indicating that the in-situ hydrolysis and condensation loading method of tetrabutyl titanate has a significant advantage over the physical mixing method. In-situ loading allows nano-TiO2 to be firmly bonded to the support surface through Ti-O-Si or Ti-O-Ca chemical bonds, resulting in stronger bonding and more uniform dispersion, effectively avoiding the problems of TiO2 agglomeration and easy detachment in physical mixing methods. Fourth, after five photocatalytic reactions and water washing regeneration cycles in Example 1, the NO removal rate remained at 77.1%, which is 92.9% of the initial value, indicating that the material of the present invention has good cycle stability and regeneration performance.

[0040] The microstructure of the material obtained in Example 1 was observed using a scanning electron microscope, and the results were consistent with... Figure 2 The microstructure shown is schematic. Figure 1 The results showed that the material consisted of spherical or near-spherical particles with a particle size distribution of 3 to 5 mm; the surface was rough and porous, and nanoscale particles with a particle size of approximately 15 to 25 nm were uniformly distributed on the support surface, corresponding to in-situ loaded nano-TiO2 particles. Energy dispersive spectroscopy analysis showed the presence of elements such as Ca, Si, Al, O, and Ti on the support surface, with Ti element being uniformly distributed, indicating that nano-TiO2 was uniformly loaded on the support surface.

[0041] Fourier transform infrared spectroscopy was used to analyze the products at each stage in Example 1. The results showed that after hydrogen peroxide modification, the intensity of the OH stretching vibration peak near wavenumber 3400 was significantly enhanced, indicating an increase in the surface hydroxyl content. After in-situ loading with tetrabutyl titanate, a Ti-O-Si stretching vibration peak appeared near wavenumber 960, proving that nano-TiO2 is chemically bonded to the support surface.

[0042] X-ray diffraction was used to analyze the powders before and after activation in Example 1. The results showed that the main phases of the powder before activation were low-calcium-silicon ratio (CSH) and quartz. After ternary synergistic activation at 650°C, the characteristic peaks of CSH weakened, and diffraction peaks of β-C2S appeared at 2θ of 32.1° and 41.2°, indicating that the activation process successfully generated β-C2S crystals with gelling activity. After loading with nano-TiO2, the characteristic diffraction peaks of anatase TiO2 appeared in the XRD pattern, located at 2θ of 25.3°, 37.8°, and 48.1°, respectively, indicating that the in-situ generated TiO2 was mainly anatase crystals with good photocatalytic activity.

[0043] Example 5 The material obtained in Example 1 was filled into a fixed-bed photocatalytic reactor, the reactor structure of which is as described above. Figure 3 As shown. The simulated flue gas composition was: NO concentration 500 ppb, SO2 concentration 100 ppb, O2 volume fraction 20%, N2 as balance gas, relative humidity 50%, and gas flow rate 1 liter per minute. It operated stably for 8 hours under 365 nm UV irradiation. The results showed that the material's NO removal rate remained stable between 79% and 83%, and no significant NO2 formation was detected in the outlet gas, indicating that NO was mainly oxidized to nitrates and fixed on the material surface. After 8 hours of operation, the material's denitrification efficiency remained above 95% of the initial value.

[0044] Example 6 200g of the material obtained in Example 1 was filled into a small air purifier filter element, with a filling layer thickness of 3cm, and placed in a 30 cubic meter sealed experimental chamber. Formaldehyde gas was injected into the chamber to an initial concentration of 1.0 mg / m³, the purifier was turned on, and the chamber's fluorescent lights were turned on at a light intensity of 500 lux. After running for 4 hours, the formaldehyde concentration in the chamber dropped to 0.08 mg / m³, achieving a removal rate of 92%, which is better than the formaldehyde limit requirement in GB / T 18883-2022 "Indoor Air Quality Standard," which limits formaldehyde to no more than 0.08 mg / m³. After water washing and regeneration, the material was reused, and the formaldehyde removal rate remained above 85% even in the 5th cycle.

[0045] Based on the above embodiments, comparative examples, and performance test results, it can be seen that: First, through the combined effect of three key technologies—thermal, mechanical, and chemical ternary activation, surface hydroxylation modification, and in-situ loading of nano-TiO2—this invention enables the obtained photocatalytic functional material to achieve a removal rate of over 83% for low-concentration NOx and over 92% for formaldehyde, which is significantly superior to the control examples.

[0046] Secondly, the material of this invention can be regenerated through simple water washing, and the NO removal rate can still maintain 92.9% of the initial value after 5 cycles, which has good prospects for engineering applications.

[0047] Third, this invention enables rapid processing and high-value utilization of waste mortar blocks. The preparation process is simple to operate and uses conventional equipment. The raw materials used are all industrial waste and conventional chemical reagents, resulting in low production costs. It is suitable for large-scale industrial production and can be widely applied in the photocatalytic purification of low-concentration NOx, VOCs and other air pollutants.

[0048] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A rapid treatment method for waste mortar blocks, characterized in that, Includes the following steps: Step 1: Crush and grind the waste mortar blocks to obtain fine powder; Step 2: Mix the fine powder obtained in Step 1 with a chemical activator and then ball mill it for activation. Then, calcine it at 550℃~700℃ to obtain activated powder. Step 3: Place the activated powder obtained in Step 2 in a hydrogen peroxide solution for surface hydroxylation modification treatment to obtain modified powder with hydroxyl-rich surface. Step 4: Disperse the modified powder obtained in Step 3 in an organic solvent, add tetrabutyl titanate and glacial acetic acid, stir, and then add water dropwise to carry out an in-situ hydrolysis and condensation reaction to generate nano-titanium dioxide on the surface of the powder. After separation, washing and drying, a composite powder loaded with nano-titanium dioxide is obtained. Step 5: Granulate the composite powder obtained in Step 4, and dry it to obtain the photocatalytic functional material.

2. The rapid treatment method for waste mortar blocks as described in claim 1, characterized in that, The grinding mentioned in step 1 refers to grinding the waste mortar blocks to a particle size ≤ 0.075 mm.

3. The rapid treatment method for waste mortar blocks as described in claim 1, characterized in that, The chemical activator mentioned in step 2 is a compound of NaOH and Na2SiO3 in a mass ratio of 2:1, and the amount added is 1% to 3% of the mass of the fine powder.

4. The rapid treatment method for waste mortar blocks as described in claim 1, characterized in that, In step 2, the ball milling activation is performed at a speed of 300-500 r / min for 30-90 min; the calcination activation is performed for 30-60 min.

5. The rapid treatment method for waste mortar blocks as described in claim 1, characterized in that, In step 3, the hydrogen peroxide solution has a mass fraction of 30%, the amount added is 2% to 5% of the mass of the activated powder, the treatment temperature is 60℃ to 80℃, and the treatment time is 1 to 3 hours.

6. The rapid treatment method for waste mortar blocks as described in claim 1, characterized in that, In step 4, the amount of tetrabutyl titanate used is 5% to 15% of the mass of the modified powder, and the molar ratio of water to tetrabutyl titanate is 2 to 4:

1.

7. The rapid treatment method for waste mortar blocks as described in claim 1, characterized in that, The granulation process described in step 5 uses a disc granulator. The binder is a solution of water glass and polyvinyl alcohol prepared in a mass ratio of 3:1, with a solid content of 5% to 10%, and the amount added is 5% to 10% of the mass of the composite powder.

8. The rapid treatment method for waste mortar blocks as described in claim 1, characterized in that, The particle size of the granules obtained by granulation in step 5 is 2~6mm.

Images