Ecological permeable brick for recycling construction waste and preparation method thereof

Abstract

The application is a kind of ecological water permeable brick for recycling construction waste and a preparation method thereof, the ecological water permeable brick is made of the following raw materials by weight: 450-500 parts of waste glass aggregate, 200-250 parts of dewatered municipal sludge, 75-125 parts of iron tailings powder, 75 parts of water, 26 parts of pore forming agent, 1-3 parts of nano calcium carbonate and 1-3 parts of nano titanium dioxide. The solid waste is processed into ecological water permeable brick through harmless and resourceful treatment, thereby improving the utilization rate of solid waste; the nano titanium dioxide has self-cleaning effect under light, can oxidize toxic pollutants in the air into inorganic substances such as CO2 and H2O, has the advantages of fast decomposition speed, high removal rate and the like, and has certain environmental protection advantages; the waste glass is used as aggregate to absorb solid waste, at the same time, the light absorption of the water permeable brick is increased, the use amount of nano titanium dioxide is reduced under the same effect condition, and certain economic advantages are achieved.

Description

Technical Field

[0001] This invention relates to the technical field of building materials, and in particular to an eco-friendly permeable brick made from recycled construction waste and its preparation method. Background Technology

[0002] Sponge city is a new generation of urban stormwater management concept, referring to cities that, like sponges, possess good resilience in adapting to environmental changes and coping with natural disasters caused by rainwater; it can also be called a "water-resilient city." Under the new circumstances, sponge city is an innovative manifestation of promoting green building construction, low-carbon city development, and the formation of smart cities.

[0003] Permeable bricks are a commonly used material in the current treatment of black and odorous water bodies and the construction of sponge cities. They have a pore structure of a certain size and number, and are usually quite porous. While the presence of this pore structure makes the brick permeable, it also reduces its compressive strength to some extent. Currently, the large-scale emission of vehicle exhaust and industrial waste gas has led to increasingly serious air pollution problems. Therefore, providing a permeable brick that combines performance and environmental protection characteristics is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] The present invention aims to address the shortcomings of the prior art by providing an eco-friendly permeable brick for recycling construction waste and its preparation method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An eco-friendly permeable brick made from recycled construction waste, comprising the following components and their weight proportions:

[0007] 450-500 parts waste glass aggregate, 200-250 parts dewatered municipal sludge, 75-125 parts iron tailings powder, 75 parts water, 26 parts pore-forming agent, 1-3 parts nano titanium dioxide, and 1-3 parts nano calcium carbonate.

[0008] The specific steps of the above-mentioned method for preparing eco-friendly permeable bricks from recycled construction waste are as follows:

[0009] S1. Waste glass is crushed by a crusher and sorted by a screening machine to prepare waste glass aggregate. The waste glass aggregate includes coarse aggregate with a particle size of 6.5-10mm, medium aggregate with a particle size of 3.5-6mm, and fine aggregate with a particle size of 0.5-3mm. The mass ratio of coarse aggregate, medium aggregate, and fine aggregate is 2:1:1.

[0010] S2. Place the municipal sludge in a forced-air drying oven and dry it at 105℃ to constant weight. Then crush, grind, and pass it through a 200-mesh sieve to prepare dewatered municipal sludge.

[0011] S3. The iron tailings are mechanically activated using a planetary ball mill to prepare iron tailings powder.

[0012] S4. After wetting the mixer, add the waste glass aggregate prepared in step S1, the dehydrated municipal sludge prepared in step S2, and the pore-forming agent in sequence. After stirring for 90 seconds, add the iron tailings powder, nano titanium dioxide, and nano calcium carbonate prepared in step S3. Stir for another 60 seconds to mix the internal materials evenly. Start adding water while stirring. Add water and stir within 120 seconds to obtain the mixture.

[0013] S5. After aging for 12 hours, the mixture obtained in step S4 is sent into a mold and formed by pressure molding. Under the conditions of maintaining ventilation and light exposure of no less than 12 hours per day, it is naturally cured for 10 days. Then it is sent into the sintering chamber for heating and sintering. After natural cooling, ecological permeable bricks are obtained.

[0014] In step S3, the iron tailings include high-silicon iron tailings, high-alumina iron tailings, high-calcium-magnesium iron tailings, Jiuquan Iron and Steel Group iron tailings, and polymetallic iron tailings.

[0015] In step S3, the parameters for mechanical activation of the iron tailings using a planetary ball mill are as follows: the rotational speed of the planetary ball mill is 360 r / min; the ball-to-material ratio is 3.75:1; the average ball diameter is 8.70 mm; the grinding time is 2-4 h; and the ball gradation is selected as follows.

[0016] In step S4, the pore-forming agent is made from one or two of wood chips and bamboo chips, and dried at 105°C to constant weight.

[0017] In step S4, the stirring speed is 700-800 r / min.

[0018] In step S5, the molding pressure is 16 MPa.

[0019] In step S5, the light intensity for natural curing is 1000-1400 Lux, the relative humidity is 25-35%, and the temperature is 25-35℃.

[0020] In step S5, the sintering temperature is 1000-1400℃ and the sintering time is 2-3 hours. First, the temperature is increased to 300-350℃ at a rate of 1-3℃ / min, then to 650-700℃ at a rate of 3-5℃ / min, and finally to 1000-1400℃ at a rate of 5-8℃ / min.

[0021] The beneficial effects of this invention are as follows: This invention processes solid waste into ecological permeable bricks through harmless and resource-based treatment, thereby improving the utilization rate of solid waste; it utilizes the self-cleaning effect of nano-titanium dioxide under light, which can oxidize toxic pollutants in the air into inorganic substances such as CO2 and H2O, and has the advantages of fast decomposition speed and high removal efficiency, thus having certain environmental advantages; while using waste glass as aggregate to dispose of solid waste, it increases the light absorption of permeable bricks and improves the self-cleaning ability of nano-titanium dioxide, reducing the amount of nano-titanium dioxide used under the same effect conditions, thus having certain economic advantages. Detailed Implementation

[0022] The principles and features of the present invention are described below with reference to specific embodiments. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. The advantages and features of the present invention will become clearer from the following description.

[0023] 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 this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] The present invention will be further described below with reference to specific embodiments:

[0025] An eco-friendly permeable brick made from recycled construction waste, comprising the following components and their weight proportions:

[0026] 450-500 parts waste glass aggregate, 200-250 parts dewatered municipal sludge, 75-125 parts iron tailings powder, 75 parts water, 26 parts pore-forming agent, 1-3 parts nano titanium dioxide, and 1-3 parts nano calcium carbonate.

[0027] The specific steps of the above-mentioned method for preparing eco-friendly permeable bricks from recycled construction waste are as follows:

[0028] S1. Waste glass is crushed by a crusher and sorted by a screening machine to prepare waste glass aggregate. The waste glass aggregate includes coarse aggregate with a particle size of 6.5-10mm, medium aggregate with a particle size of 3.5-6mm, and fine aggregate with a particle size of 0.5-3mm. The mass ratio of coarse aggregate, medium aggregate, and fine aggregate is 2:1:1.

[0029] S2. Place the municipal sludge in a forced-air drying oven and dry it at 105℃ to constant weight. Then crush, grind, and pass it through a 200-mesh sieve to prepare dewatered municipal sludge.

[0030] S3. The iron tailings are mechanically activated using a planetary ball mill at a speed of 360 r / min; the ball-to-material ratio is 3.75:1; the average ball diameter is 8.70 mm; the grinding time is 2-4 hours; and the ball gradation is selected as follows. Preparation of iron tailings powder;

[0031] Iron tailings include, but are not limited to, high-silicon iron tailings, high-alumina iron tailings, high-calcium-magnesium iron tailings, Jiuquan Iron & Steel Group iron tailings, and polymetallic iron tailings;

[0032] S4. After wetting the mixer, add the waste glass aggregate prepared in step S1, the dehydrated municipal sludge prepared in step S2, and the pore-forming agent in sequence. After stirring for 90 seconds, add the iron tailings powder, nano titanium dioxide, and nano calcium carbonate prepared in step S3. Stir for another 60 seconds to mix the internal materials evenly. Start adding water while stirring. Add water and stir within 120 seconds to obtain the mixture.

[0033] The pore-forming agent is made from one or two of wood chips and bamboo chips, and dried at 105℃ to constant weight; the stirring speed is 700-800 r / min.

[0034] S5. After aging for 12 hours, the mixture obtained in step S4 is fed into a mold and formed using a pressure molding method at a pressure of 16 MPa. The mixture is then naturally cured for 10 days under conditions of good ventilation and at least 12 hours of sunlight per day. The light intensity during natural curing is 1000-1400 Lux, the relative humidity is 25-35%, and the temperature is 25-35℃. The mixture is then placed in a sintering chamber for heating and sintering at a temperature of 1000-1400℃ for 2-3 hours. The temperature is first increased to 300-350℃ at a rate of 1-3℃ / min, then to 650-700℃ at a rate of 3-5℃ / min, and finally to 1000-1400℃ at a rate of 5-8℃ / min. After natural cooling, the permeable ecological brick is obtained. Specific Implementation Example 1:

[0036] An eco-friendly permeable brick made from recycled construction waste is produced from the following raw materials in parts by weight: 450 parts waste glass aggregate, 200 parts dehydrated municipal sludge, 125 parts iron tailings powder, 75 parts water, 26 parts pore-forming agent, 1 part nano titanium dioxide, and 3 parts nano calcium carbonate.

[0037] The above-mentioned method for preparing eco-friendly permeable bricks made from recycled construction waste includes the following steps:

[0038] S1. Waste glass is crushed by a crusher and sorted by a screening machine to prepare waste glass aggregate. The waste glass aggregate includes coarse aggregate with a particle size of 6.5-10mm, medium aggregate with a particle size of 3.5-6mm, and fine aggregate with a particle size of 0.5-3mm. The mass ratio of coarse aggregate, medium aggregate, and fine aggregate is 2:1:1.

[0039] S2. Place the municipal sludge in a forced-air drying oven and dry it at 105℃ to constant weight. Then crush, grind, and pass it through a 200-mesh sieve to prepare dewatered municipal sludge.

[0040] S3. The iron tailings are mechanically activated using a planetary ball mill to prepare iron tailings powder.

[0041] S4. After wetting the mixer, add the waste glass aggregate prepared in step S1, the dehydrated municipal sludge prepared in step S2, and the pore-forming agent in sequence. After stirring for 90 seconds, add the iron tailings powder, nano titanium dioxide, and nano calcium carbonate prepared in step S3. Stir for another 60 seconds to mix the internal materials evenly. Start adding water while stirring. Add water and stir within 120 seconds to obtain the mixture.

[0042] S5. After aging for 12 hours, the mixture obtained in step S4 is sent into a mold and formed by pressure molding. Under the conditions of maintaining ventilation and light exposure of no less than 12 hours per day, it is naturally cured for 10 days. Then it is sent into the sintering chamber for heating and sintering. After natural cooling, ecological permeable bricks are obtained.

[0043] Municipal sludge is a byproduct of the sewage treatment process in sewage treatment plants. It is a viscous solid sediment containing inorganic and organic substances such as sand, residual feces, and microbial remains.

[0044] The iron tailings are of the high-silicon type.

[0045] The parameters for mechanical activation of iron tailings using a planetary ball mill are as follows: mill speed 360 r / min; ball-to-material ratio 3.75:1; average ball diameter 8.70 mm; and ball gradation selected. The grinding time is 4 hours.

[0046] The pore-forming agent is wood chips dried to constant weight at 105°C.

[0047] The stirring speed is 700 r / min.

[0048] The molding pressure is 16 MPa.

[0049] Natural maintenance requires a light intensity of 1000 Lux, a relative humidity of 25%, and a temperature of 25°C.

[0050] The sintering temperature for the heating sintering is 1000℃, and the sintering time is 2 hours. First, the temperature is increased to 300℃ at a rate of 1℃ / min, then to 650℃ at a rate of 3℃ / min, and finally to 1000℃ at a rate of 5℃ / min. Specific Implementation Example 2:

[0052] An eco-friendly permeable brick made from recycled construction waste is produced from the following raw materials in parts by weight: 500 parts waste glass aggregate, 200 parts dehydrated municipal sludge, 120 parts iron tailings powder, 75 parts water, 26 parts pore-forming agent, 1 part nano titanium dioxide, and 3 parts nano calcium carbonate.

[0053] Its preparation method is the same as that in Specific Example 1.

[0054] Municipal sludge is a byproduct of the sewage treatment process in sewage treatment plants. It is a viscous solid sediment containing inorganic and organic substances such as sand, residual feces, and microbial remains.

[0055] The iron tailings are of the high-silicon type.

[0056] The parameters for mechanical activation of iron tailings using a planetary ball mill are as follows: mill speed 360 r / min; ball-to-material ratio 3.75:1; average ball diameter 8.70 mm; and ball gradation selected. The grinding time is 4 hours.

[0057] The pore-forming agent is wood chips dried to constant weight at 105°C.

[0058] The stirring speed is 750 r / min.

[0059] The molding pressure is 16 MPa.

[0060] Natural maintenance requires a light intensity of 1200 Lux, a relative humidity of 30%, and a temperature of 30°C.

[0061] The sintering temperature for the heating sintering is 1200℃, and the sintering time is 2.5h. First, the temperature is increased to 325℃ at a rate of 2℃ / min, then to 675℃ at a rate of 4℃ / min, and finally to 1200℃ at a rate of 6℃ / min. Specific Implementation Example 3:

[0063] An eco-friendly permeable brick made from recycled construction waste is produced from the following raw materials in parts by weight: 450 parts waste glass aggregate, 225 parts dehydrated municipal sludge, 100 parts iron tailings powder, 75 parts water, 26 parts pore-forming agent, 2 parts nano titanium dioxide, and 2 parts nano calcium carbonate.

[0064] Its preparation method is the same as that in Specific Example 1.

[0065] Municipal sludge is a byproduct of the sewage treatment process in sewage treatment plants. It is a viscous solid sediment containing inorganic and organic substances such as sand, residual feces, and microbial remains.

[0066] The iron tailings are of the high-alumina type.

[0067] The parameters for mechanical activation of iron tailings using a planetary ball mill are as follows: mill speed 360 r / min; ball-to-material ratio 3.75:1; average ball diameter 8.70 mm; and ball gradation selected. The grinding time is 3 hours.

[0068] The pore-forming agent is bamboo shavings dried to constant weight at 105℃.

[0069] The stirring speed is 800 r / min.

[0070] The molding pressure is 16 MPa.

[0071] Naturally maintained conditions include a light intensity of 1400 Lux, a relative humidity of 35%, and a temperature of 35°C.

[0072] The sintering temperature for the heating sintering is 1400℃, and the sintering time is 3h. First, the temperature is increased to 350℃ at a rate of 3℃ / min, then to 700℃ at a rate of 5℃ / min, and finally to 1400℃ at a rate of 8℃ / min. Specific Implementation Example 4:

[0074] An eco-friendly permeable brick made from recycled construction waste is produced from the following raw materials in parts by weight: 500 parts waste glass aggregate, 225 parts dehydrated municipal sludge, 100 parts iron tailings powder, 75 parts water, 26 parts pore-forming agent, 2 parts nano titanium dioxide, and 2 parts nano calcium carbonate.

[0075] Its preparation method is the same as that in Specific Example 1.

[0076] Municipal sludge is a byproduct of the sewage treatment process in sewage treatment plants. It is a viscous solid sediment containing inorganic and organic substances such as sand, residual feces, and microbial remains.

[0077] The iron tailings are of the high-alumina type.

[0078] The parameters for mechanical activation of iron tailings using a planetary ball mill are as follows: mill speed 360 r / min; ball-to-material ratio 3.75:1; average ball diameter 8.70 mm; and ball gradation selected. The grinding time is 3 hours.

[0079] The pore-forming agent is bamboo shavings dried to constant weight at 105℃.

[0080] The stirring speed is 700 r / min.

[0081] The molding pressure is 16 MPa.

[0082] Natural maintenance requires a light intensity of 1000 Lux, a relative humidity of 25%, and a temperature of 25°C.

[0083] The sintering temperature for the heating sintering is 1000℃, and the sintering time is 2 hours. First, the temperature is increased to 300℃ at a rate of 1℃ / min, then to 650℃ at a rate of 3℃ / min, and finally to 1000℃ at a rate of 5℃ / min. Specific Implementation Example 5:

[0085] An eco-friendly permeable brick made from recycled construction waste is produced from the following raw materials in parts by weight: 450 parts waste glass aggregate, 250 parts dehydrated municipal sludge, 75 parts iron tailings powder, 75 parts water, 26 parts pore-forming agent, 3 parts nano titanium dioxide, and 1 part nano calcium carbonate.

[0086] Its preparation method is the same as that in Specific Example 1.

[0087] Municipal sludge is a byproduct of the sewage treatment process in sewage treatment plants. It is a viscous solid sediment containing inorganic and organic substances such as sand, residual feces, and microbial remains.

[0088] The iron tailings are of the high-calcium-magnesium type.

[0089] The parameters for mechanical activation of iron tailings using a planetary ball mill are as follows: mill speed 360 r / min; ball-to-material ratio 3.75:1; average ball diameter 8.70 mm; and ball gradation selected. The grinding time is 2 hours.

[0090] The pore-forming agent is wood chips and bamboo chips dried to constant weight at 105℃, with a mass ratio of wood chips to bamboo chips of 1:1 after drying.

[0091] The stirring speed is 750 r / min.

[0092] The molding pressure is 16 MPa.

[0093] Natural maintenance requires a light intensity of 1200 Lux, a relative humidity of 30%, and a temperature of 30°C.

[0094] The sintering temperature for the heating sintering is 1200℃, and the sintering time is 2.5h. First, the temperature is increased to 325℃ at a rate of 2℃ / min, then to 675℃ at a rate of 4℃ / min, and finally to 1200℃ at a rate of 6℃ / min. Specific Implementation Example 6:

[0096] An eco-friendly permeable brick made from recycled construction waste is produced from the following raw materials in parts by weight: 500 parts waste glass aggregate, 250 parts dehydrated municipal sludge, 75 parts iron tailings powder, 75 parts water, 26 parts pore-forming agent, 3 parts nano titanium dioxide, and 1 part nano calcium carbonate.

[0097] Its preparation method is the same as that in Specific Example 1.

[0098] Municipal sludge is a byproduct of the sewage treatment process in sewage treatment plants. It is a viscous solid sediment containing inorganic and organic substances such as sand, residual feces, and microbial remains.

[0099] The iron tailings are of the high-calcium-magnesium type.

[0100] The parameters for mechanical activation of iron tailings using a planetary ball mill are as follows: mill speed 360 r / min; ball-to-material ratio 3.75:1; average ball diameter 8.70 mm; and ball gradation selected. The grinding time is 2 hours.

[0101] The pore-forming agent is wood chips and bamboo chips dried to constant weight at 105℃, with a mass ratio of wood chips to bamboo chips of 1:1 after drying.

[0102] The stirring speed is 800 r / min.

[0103] The molding pressure is 16 MPa.

[0104] Naturally maintained conditions include a light intensity of 1400 Lux, a relative humidity of 35%, and a temperature of 35°C.

[0105] The sintering temperature for the heating sintering is 1400℃, and the sintering time is 3h. First, the temperature is increased to 350℃ at a rate of 3℃ / min, then to 700℃ at a rate of 5℃ / min, and finally to 1400℃ at a rate of 8℃ / min.

[0106] The ecological permeable bricks prepared in specific embodiments 1-6 were subjected to performance testing, and the test results are shown in Table 1.

[0107] Table 1 shows the performance test results of the permeable ecological bricks prepared in specific embodiments 1-6.

[0108]

[0109]

[0110] As shown in Table 1, the permeable ecological bricks prepared by this invention have good permeability, with a permeability rate of 2.41 × 10⁻⁶. -2 -3.32×10 -2 For permeable bricks to achieve a permeability coefficient greater than 1×10 cm / s, the flow rate should be between cm / s.-2 The design requirement of cm / s is met, while the compressive strength reaches 30MPa. By adding nano titanium dioxide, the self-cleaning ability of the permeable brick is increased, the sterilization rate reaches 98.5%, and the solid waste utilization rate reaches 91%, which improves the environmental friendliness of the ecological permeable brick, making the ecological permeable brick of this invention suitable for promotion and application in practical engineering.

[0111] This invention processes solid waste into eco-friendly permeable bricks through harmless and resource-based treatment, improving the utilization rate of solid waste. It utilizes nano-titanium dioxide's self-cleaning properties under light, oxidizing toxic pollutants in the air into inorganic substances such as CO2 and H2O. This process boasts advantages such as rapid decomposition and high purification efficiency, resulting in eco-friendly permeable bricks with certain environmental advantages. Furthermore, using waste glass as aggregate to dispose of solid waste increases the light absorption of the permeable bricks, enhancing the self-cleaning ability of the nano-titanium dioxide. Under the same effective conditions, this reduces the amount of nano-titanium dioxide used, offering certain economic advantages.

[0112] The present invention has been described above with reference to specific embodiments. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or direct application to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A method for preparing eco-friendly permeable bricks from recycled construction waste, characterized in that, The components and their weight percentages of the permeable ecological bricks are as follows: 450-500 parts of waste glass aggregate, 200-250 parts of dewatered municipal sludge, 75-125 parts of iron tailings powder, 75 parts of water, 26 parts of pore-forming agent, 1-3 parts of nano titanium dioxide, and 1-3 parts of nano calcium carbonate. The specific preparation steps are as follows: S1. Waste glass is crushed by a crusher and sorted by a screening machine to prepare waste glass aggregate. The waste glass aggregate includes coarse aggregate with a particle size of 6.5-10mm, medium aggregate with a particle size of 3.5-6mm, and fine aggregate with a particle size of 0.5-3mm. The mass ratio of coarse aggregate, medium aggregate, and fine aggregate is 2:1:

1. S2. Place the municipal sludge in a forced-air drying oven and dry it at 105°C to constant weight. Then crush, grind, and pass it through a 200-mesh sieve to prepare dewatered municipal sludge. S3. The iron tailings are mechanically activated using a planetary ball mill to prepare iron tailings powder. S4. After wetting the mixer, add the waste glass aggregate prepared in step S1, the dehydrated municipal sludge prepared in step S2, and the pore-forming agent in sequence. After stirring for 90 seconds, add the iron tailings powder, nano titanium dioxide, and nano calcium carbonate prepared in step S3. Stir for another 60 seconds to mix the internal materials evenly. Start adding water while stirring. Add water and stir within 120 seconds to obtain the mixture. S5. After aging for 12 hours, the mixture obtained in step S4 is sent into a mold and formed by pressure molding. Under the conditions of maintaining ventilation and light exposure of no less than 12 hours per day, it is naturally cured for 10 days. Then it is sent into the sintering chamber for heating and sintering. After natural cooling, ecological permeable bricks are obtained.

2. The method for preparing eco-friendly permeable bricks from recycled construction waste according to claim 1, characterized in that, In step S3, the iron tailings include high-silicon iron tailings, high-alumina iron tailings, high-calcium-magnesium iron tailings, Jiuquan Iron and Steel Group iron tailings, and polymetallic iron tailings.

3. The method for preparing eco-friendly permeable bricks from recycled construction waste according to claim 2, characterized in that, In step S3, the parameters for mechanical activation of iron tailings by a planetary ball mill are as follows: the rotation speed of the planetary ball mill is 360 r / min; the ball-to-material ratio is 3.75:1; the average ball diameter is 8.70 mm; the grinding time is 2-4 h; and the ball gradation is φ5:φ8:φ10:φ15=6:5:5:

2.

4. The method for preparing eco-friendly permeable bricks from recycled construction waste according to claim 3, characterized in that, In step S4, the pore-forming agent is made from one or two of wood chips and bamboo chips, and dried at 105°C to constant weight.

5. The method for preparing eco-friendly permeable bricks from recycled construction waste according to claim 4, characterized in that, In step S4, the stirring speed is 700-800 r / min.

6. The method for preparing eco-friendly permeable bricks from recycled construction waste according to claim 5, characterized in that, In step S5, the molding pressure is 16 MPa.

7. The method for preparing eco-friendly permeable bricks from recycled construction waste according to claim 6, characterized in that, In step S5, the light intensity for natural curing is 1000-1400 Lux, the relative humidity is 25-35%, and the temperature is 25-35℃.

8. The method for preparing eco-friendly permeable bricks from recycled construction waste according to claim 7, characterized in that, In step S5, the sintering temperature is 1000-1400℃ and the sintering time is 2-3 hours. First, the temperature is increased to 300-350℃ at a rate of 1-3℃ / min, then to 650-700℃ at a rate of 3-5℃ / min, and finally to 1000-1400℃ at a rate of 5-8℃ / min.

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