Preparation method of baking-free brick based on activated printing and dyeing sludge cemented construction waste

Abstract

The invention discloses a preparation method of a baking-free brick based on activated printing and dyeing sludge cemented construction waste. The baking-free brick is prepared from the following raw materials: construction waste, industrial solid waste, printing and dyeing sludge and an activating agent. Compared with the prior art, the solid raw materials used in the invention all come from solid wastes in the building industry and the industry, and the solid wastes are recycled through physical and chemical activation, so that on one hand, a large amount of different types of solid wastes are consumed, and on the other hand, the dependence on natural resources is also reduced; and the method accords with the concepts of circular economy and sustainable development in China. Meanwhile, the preparation method disclosed by the invention has the advantages of simple preparation process, low cost, low energy consumption and carbon emission, no need of a high-temperature process and the like, and has a wide application prospect.

Description

Technical Field

[0001] This application relates to the fields of solid waste resource utilization and building materials technology, specifically to a method and system for preparing non-fired bricks based on activated dyeing sludge cemented construction waste. Background Technology

[0002] With the emergence of rural urbanization development models, the construction industry, as a key pillar industry, generates a large amount of construction waste while boosting GDP. Due to a lack of scientific and reasonable disposal methods, construction waste places significant pressure on the natural environment. Finding effective ways to utilize construction waste, ensuring the sustainable development of the construction industry under a "green" approach, and achieving resource-based recycling of the generated construction waste are of paramount importance.

[0003] my country is one of the world's largest textile producers and exporters, and the textile printing and dyeing industry is one of its pillar industries. Finding a way to externally treat and dispose of sludge is crucial.

[0004] In summary, dyeing and printing sludge has poor gelling activity; construction waste has low strength and high water absorption; existing technologies for preparing non-fired bricks usually only allow for the small-scale incorporation of one of these two into cement-based materials, resulting in low utilization rates of dyeing and printing sludge and construction waste.

[0005] Furthermore, dyeing and printing sludge contains a large amount of organic matter, and construction waste, while having low strength, also has strong water absorption, seriously affecting the physical properties of cement-based non-fired bricks. This is also a problem in the resource utilization of dyeing and printing sludge and construction waste in the field of building materials. Currently, patent literature reports that the amount of dyeing and printing sludge or construction waste added to non-fired bricks is relatively small, and the capacity to absorb dyeing and printing sludge and construction waste is limited. Moreover, there are few reports on how to solve the problem of the weakening of the strength of cementitious materials by dyeing and printing sludge and construction waste. The applicant has systematically reviewed a large number of domestic and foreign patent literature and scientific research materials, but has not found any reports on the method of "dyeing and printing sludge pretreatment + construction waste + prehydration + dry hardening molding" to solve the strength loss problem in the synergistic utilization of dyeing and printing sludge and construction waste in building materials, or on the preparation of non-fired bricks made by activating dyeing and printing sludge to bind construction waste.

[0006] Furthermore, conventional non-fired bricks typically use silicate cement as a binder and natural sand and gravel as aggregates, and are produced through a dry-hardening pressing process. Sludge-fired bricks, on the other hand, utilize a complete waste system, do not use silicate cement or natural sand and gravel, and are formed using the same dry-hardening process. Both in terms of manufacturing process and cost, conventional non-fired bricks have higher production costs, a longer curing period, and higher energy consumption during the dry-hardening process. Summary of the Invention

[0007] The main objective of this application is to provide a method and system for preparing non-fired bricks based on activated dyeing and printing sludge cemented construction waste, in order to solve the current problems.

[0008] To achieve the above objectives, this application provides the following technology:

[0009] The first aspect of this application provides a method for preparing non-fired bricks based on activated dyeing and printing sludge cemented construction waste, comprising the following preparation steps:

[0010] The dyeing and printing sludge raw material is activated and pulverized to obtain activated dyeing and printing sludge raw material with a mesh size of 100 or smaller.

[0011] Construction waste is crushed to obtain fine aggregate from construction waste.

[0012] Weigh out the dyeing and printing sludge, construction waste, fly ash and activator according to the formula, and mix them to obtain a uniform slurry.

[0013] The homogeneous slurry is pre-hydrated to obtain a pre-hydrated cemented semi-dry material;

[0014] The obtained semi-dry material is pressed to obtain brick blanks;

[0015] The brick blanks are cured at 60-80℃ for 8-12 hours to obtain non-fired bricks made from activated dyeing sludge cemented with construction waste.

[0016] As an optional embodiment of this application, the dyeing and printing sludge raw material may be activated to obtain activated dyeing and printing sludge raw material of 100 mesh or less, including:

[0017] The raw material of dyeing and printing sludge is chemically activated through enzyme catalysis, hydrothermal treatment, organic matter removal, filtration, and drying processes.

[0018] The chemically activated dyeing and printing sludge raw material is ground using a mechanical grinding process to achieve physical activation, resulting in activated dyeing and printing sludge raw material ground to 100 mesh or less.

[0019] As an optional embodiment of this application, the activator may be a mixture of calcium oxide, alkali metal silicate / alkaline earth metal silicate and water.

[0020] As an optional embodiment of this application, the uniform slurry is optionally prepared by mixing and stirring dyeing sludge, crushed construction waste, fly ash, calcium oxide, alkali metal silicate / alkaline earth metal silicate and water in a mass ratio of 1:(4-6):(0.8-1.7):(0.15-0.25):(0.9-1.1):(1.1-1.3).

[0021] As an optional embodiment of this application, the homogeneous slurry may be pre-hydrated to obtain a pre-hydrated, cemented, semi-dry material, comprising:

[0022] Prepare a constant temperature chamber and set the temperature to 20-25℃;

[0023] The uniform slurry is placed in the constant temperature box for pre-hydration, so that the calcium and silicate in the uniform slurry system react under alkaline conditions to generate hydrated calcium silicate and coat the surface of the construction waste, thereby improving the physical properties of the construction waste. At the same time, the fluidity of the slurry is reduced to a level that facilitates the pressing and molding of brick blanks.

[0024] After prehydration for 5-10 minutes, the resulting mud is broken up to obtain a prehydrated cemented semi-dry material.

[0025] As an optional embodiment of this application, optionally, the obtained semi-dry material is pressed into brick blanks, including:

[0026] The resulting semi-dry material is loaded into the mold of a pressure brick making machine and pressed for 15 seconds using a pressure of 30-1000kN to obtain a brick blank.

[0027] As an optional implementation of this application, the brick blanks may be cured under preset curing conditions to obtain non-fired bricks made from activated dyeing and printing sludge-bonded construction waste, including:

[0028] The brick blanks are cured at 60-80℃ for 8-12 hours to obtain non-fired bricks made from activated dyeing sludge cemented with construction waste.

[0029] A second aspect of this application provides a system for preparing the aforementioned non-fired bricks, comprising:

[0030] The dyeing and printing sludge activation and pulverization unit is used to activate and pulverize the dyeing and printing sludge raw material to obtain dyeing and printing sludge activated raw material of 100 mesh and below.

[0031] The construction waste crushing unit is used to crush construction waste to obtain fine aggregate.

[0032] The weighing unit is used to weigh out the dyeing sludge, construction waste, fly ash and activator according to the formula.

[0033] The mixing unit is used to mix and stir the measured dyeing sludge, construction waste, fly ash and activator to obtain a uniform slurry.

[0034] The prehydration unit is used to prehydrate the homogeneous slurry to obtain a prehydrated cemented semi-dry material.

[0035] The brick blank forming unit is used to press the obtained semi-dry material into brick blanks;

[0036] The brick curing unit is used to cure the brick blanks at 60-80℃ for 8-12 hours to obtain non-fired bricks made from activated dyeing sludge cemented with construction waste.

[0037] Compared with the prior art, this application can bring the following technical effects:

[0038] 1. The raw materials for the non-fired bricks of this invention include construction waste, industrial solid waste, dyeing sludge, and activators. Compared with existing technologies, the solid raw materials used in this invention are all derived from solid waste from the construction and industrial sectors. These solid wastes are recycled through physical and chemical activation, which not only consumes a large amount of different types of solid waste but also reduces dependence on natural resources, aligning with the national concepts of circular economy and sustainable development. Furthermore, the preparation process involved in this invention is simple, low-cost, energy-efficient, and carbon-emission-free, requiring no high-temperature processes, thus possessing broad application prospects.

[0039] 2. The development of non-fired bricks based on activated dyeing and printing sludge bonded with construction waste is of great significance for promoting the large-scale synergistic utilization of dyeing and printing sludge and construction waste in building materials. Based on this, the preparation of non-fired bricks using treated dyeing and printing sludge and crushed construction waste as the main raw materials has advantages such as simple process, high utilization rate of dyeing and printing sludge and construction waste, and the fact that the raw materials for brick making are entirely solid waste, showing potential for industrial application. Attached Figure Description

[0040] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings:

[0041] Figure 1 This is a schematic diagram of the entire process of preparing the non-fired bricks according to the present invention. Detailed Implementation

[0042] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0043] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0044] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0045] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0046] In addition, the term "multiple" should mean two or more.

[0047] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0048] The first aspect of this application provides a method for preparing non-fired bricks based on activated dyeing and printing sludge cemented construction waste, comprising the following preparation steps:

[0049] The dyeing and printing sludge raw material is activated and pulverized to obtain activated dyeing and printing sludge raw material with a mesh size of 100 or smaller.

[0050] Construction waste is crushed to obtain fine aggregate from construction waste.

[0051] Weigh out the dyeing and printing sludge, construction waste, fly ash and activator according to the formula, and mix them to obtain a uniform slurry.

[0052] The homogeneous slurry is pre-hydrated to obtain a pre-hydrated cemented semi-dry material;

[0053] The obtained semi-dry material is pressed to obtain brick blanks;

[0054] The brick blanks are cured at 60-80℃ for 8-12 hours to obtain non-fired bricks made from activated dyeing sludge cemented with construction waste.

[0055] like Figure 1 The diagram shown is a complete process flow chart of the preparation method of this application. Specifically, it includes the following steps:

[0056] First, the dyeing and printing sludge is subjected to enzyme catalysis, hydrothermal treatment, organic matter removal, filtration, drying, and grinding to 100 mesh or less. Construction waste is crushed to form fine aggregate. The treated and ground dyeing and printing sludge, crushed construction waste, fly ash, calcium oxide, alkali metal silicates / alkaline earth metal silicates, and water are mixed and stirred evenly in a mass ratio of 1:(4-6):(0.8-1.7):(0.15-0.25):(0.9-1.1):(1.1-1.3). The mixture is then placed in a constant temperature chamber at 20-25℃ for pre-hydration for 5-10 minutes. This allows the calcium and silicates in the system to react under alkaline conditions to form hydrated calcium silicate, which coats the surface of the construction waste, improving its physical properties. At the same time, it reduces the fluidity of the slurry to a suitable level for pressing and molding with a pressure brick making machine. Then, the semi-dry material obtained by prehydration is broken up and separated, then loaded into a mold and pressed under a pressure of 30-1000kN to obtain a brick blank. The obtained brick blank is placed in a constant temperature box at 60-80℃ for 8-12 hours to obtain a non-fired brick based on activated dyeing sludge cemented construction waste.

[0057] The specific steps are as follows:

[0058] (1) The dyeing and printing sludge is chemically activated by enzyme catalysis, hydrothermal process, organic matter removal, filtration and drying process, and then physically activated by mechanical grinding process and ground to 100 mesh or less to obtain activated dyeing and printing sludge.

[0059] (2) Construction waste composed of brittle and hard building materials such as broken bricks, concrete and cement mortar is processed into fine aggregate of construction waste through crushing process;

[0060] (3) Weigh out the processed and ground fly ash, dyeing sludge and construction waste according to the formula and add them to the mixer;

[0061] (4) Weigh out calcium oxide, alkali metal silicate / alkaline earth metal silicate and water according to the formula, add them to a beaker and stir to obtain a mixed solution;

[0062] (5) After the mixed solution described in step (4) has cooled to room temperature, add it to the mixer (while waiting for the mixed solution to cool, the beaker containing the mixed solution needs to be sealed with plastic wrap), and stir for 3 minutes to obtain a uniform slurry;

[0063] (6) The slurry obtained in step (5) is placed in a constant temperature box at 20-25℃ for prehydration, so that the calcium and silicate in the system react under alkaline conditions to generate hydrated calcium silicate, which coats the surface of the construction waste, improves the physical properties of the construction waste, and at the same time reduces the fluidity of the slurry to a suitable level for the pressure brick making machine to press and form. After 5-10 minutes, the obtained mud is broken up to obtain a prehydrated cemented semi-dry material.

[0064] (7) The semi-dry material obtained in step (6) is loaded into the mold of the pressure brick making machine and pressed with a pressure of 30-1000kN for 15s to obtain a brick blank.

[0065] (8) Place the brick blanks described in step (7) in a constant temperature curing chamber and cure them at 60-80℃ for 8-12 hours to obtain non-fired bricks made from activated dyeing sludge cemented with construction waste.

[0066] The innovation and advantages of the method for solving the strength loss problem in the co-utilization of dyeing and printing sludge and construction waste into building materials according to the present invention are as follows:

[0067] (1) A new approach is proposed to address the problem of damage to the strength of other cementitious materials in the building material utilization of dyeing and printing sludge by using pretreatment steps such as enzyme catalysis, hydrothermal treatment, organic matter removal, filtration, drying, and grinding to 100 mesh or below. That is, through a series of pretreatments, the organic matter content in the dyeing and printing sludge is reduced, the particle size of the dyeing and printing sludge is reduced by grinding, the reaction temperature is increased, and the reactivity of the original dyeing and printing sludge is increased;

[0068] (2) The materials used for pressing brick blanks need to be pre-hydrated so that the calcium and silicate in the system react under alkaline conditions to generate hydrated calcium silicate to coat the surface of construction waste, improve the physical properties of construction waste, and at the same time reduce the fluidity of the slurry to a suitable level that is easy for the pressure brick making machine to press and form.

[0069] (3) In order to improve the strength of the non-fired bricks, the overall proportion adopts a low water-cement ratio. The material used to press the brick blank is a geological polymer with semi-dry fly ash as the main component. It cannot be naturally formed or formed by vibration. Therefore, the forming method used is dry-hard pressing.

[0070] (4) The non-fired bricks made from dyeing and printing sludge bonded to construction waste do not require the use of any cement materials. All raw materials are derived from industrial solid waste. Magnesium slag, steel slag, carbide slag, fly ash, and incinerated waste fly ash can also be used as raw materials.

[0071] (5) The preparation process of activated dyeing and printing sludge cemented construction waste non-fired bricks has a short cycle, does not require natural curing for 28 days, can be quickly formed and has good physical properties.

[0072] (6) Activated dyeing and printing sludge cemented construction waste non-fired bricks do not need to be sintered at high temperature and can be cured at a temperature of 25-60℃.

[0073] (7) It is proposed to crush the original construction waste into solid particles with smaller diameters and use them as fine aggregates as raw materials for non-fired bricks made from activated dyeing and printing sludge bonded construction waste. This can effectively improve the overall strength of the non-fired bricks and significantly increase the amount of construction waste added to the non-fired bricks made from activated dyeing and printing sludge bonded construction waste, thereby improving the utilization efficiency of construction waste.

[0074] Example 1

[0075] (1) The original printing and dyeing sludge is subjected to enzyme catalysis, hydrothermal treatment, organic matter removal, filtration, drying and grinding to 100 mesh or below;

[0076] (2) Crushing construction waste into fine aggregate;

[0077] (3) Weigh out 300g of processed and ground dyeing sludge, 1800g of crushed construction waste, and 500g of fly ash according to the formula and add them to the mixer;

[0078] (4) Weigh out 65g of calcium oxide, 285g of magnesium silicate and 340g of water according to the formula, add them to a beaker and stir to obtain a mixed solution;

[0079] (5) After the mixed solution described in step (4) has cooled to room temperature, add it to the mixer (while waiting for the mixed solution to cool, the beaker containing the mixed solution needs to be sealed with plastic wrap), and stir for 3 minutes to obtain a uniform slurry;

[0080] (6) The slurry obtained in step (5) is placed in a constant temperature box at 25°C for prehydration, so that the calcium and silicate in the system react under alkaline conditions to hydrate calcium silicate and coat the surface of the construction waste, thereby improving the physical properties of the construction waste. At the same time, the fluidity of the slurry is reduced to a suitable level that is easy to press and form in a pressure brick making machine. After 7 minutes, the resulting mud is broken up.

[0081] (7) The semi-dry material obtained in step (6) is loaded into the mold and pressed with a pressure of 100kN for 15s to obtain a brick blank;

[0082] (8) Place the brick blanks described in step (7) in a constant temperature curing chamber and cure them at 60°C for 8 hours. This yields non-fired bricks based on activated dyeing sludge cemented with construction waste.

[0083] The non-fired bricks made from activated dyeing sludge and cemented construction waste have a compressive strength of 21.4 MPa.

[0084] Example 2

[0085] (1) The original printing and dyeing sludge is subjected to enzyme catalysis, hydrothermal treatment, organic matter removal, filtration, drying and grinding to 100 mesh or below;

[0086] (2) Crushing construction waste into fine aggregate;

[0087] (3) Weigh out 300g of processed and ground dyeing sludge, 1800g of crushed construction waste, and 280g of fly ash according to the formula and add them to the mixer;

[0088] (4) Weigh out 90g of calcium oxide, 360g of potassium silicate and 360g of water according to the formula, add them to a beaker and stir to obtain a mixed solution;

[0089] (5) After the mixed solution described in step (4) has cooled to room temperature, add it to the mixer (while waiting for the mixed solution to cool, the beaker containing the mixed solution needs to be sealed with plastic wrap), and stir for 3 minutes to obtain a uniform slurry;

[0090] (6) The slurry obtained in step (5) is placed in a constant temperature box at 25°C for prehydration, so that the calcium and silicate in the system react under alkaline conditions to generate hydrated calcium silicate, which coats the surface of the construction waste, improves the physical properties of the construction waste, and at the same time reduces the fluidity of the slurry to a suitable level for the pressure brick making machine to press and form. After 10 minutes, the obtained mud is broken up.

[0091] (7) The semi-dry material obtained in step (6) is loaded into the mold and pressed with a pressure of 100kN for 15s to obtain a brick blank;

[0092] (8) Place the brick blanks described in step (7) in a constant temperature curing chamber and cure them at 60°C for 8 hours. This yields activated dyeing sludge-bonded construction waste non-fired bricks.

[0093] The non-fired bricks made from activated dyeing sludge bonded to construction waste have a compressive strength of 25.6 MPa.

[0094] In Examples 1 and 2 above, the compressive strength is related to the content of dyeing and printing sludge, construction waste, and cementing material (fly ash). A higher cement-to-filler ratio results in lower content of dyeing and printing sludge and construction waste. Increased cementing material proportion facilitates depolymerization-polymerization reactions and cation exchange reactions under the catalysis of the activator, forming a framework network composed of silicon-oxygen tetrahedra, aluminum-oxygen tetrahedra, and aluminum-oxygen octahedra, as well as CSH gel and hydrated calcium aluminosilicate gel, thereby improving the later-stage strength and durability of the non-fired bricks. Furthermore, this invention uses dyeing and printing sludge and fly ash as cementing materials and construction waste as aggregate. By rationally controlling the replacement rate of dyeing and printing sludge and the cement-to-filler ratio, the amount of fly ash required for non-fired bricks to achieve the same compressive strength is reduced, further lowering the production cost of non-fired bricks and realizing the recycling of construction solid waste.

[0095] The method of preparing non-fired bricks from activated dyeing and printing sludge bonded to construction waste significantly reduces manufacturing costs and process conditions compared to ordinary non-fired bricks.

[0096] Non-fired bricks based on activated dyeing and printing sludge-bonded construction waste refer to building brick materials made by using dyeing and printing sludge and fly ash instead of cement as cementing materials, and construction waste instead of natural sand and gravel as raw materials, processed through mixing, molding, and curing. Their key feature is that the entire system is composed of solid waste, meaning all solid raw materials are industrial solid waste, without the use of cement or natural sand and gravel. Specifically, the amount of dyeing and printing sludge and construction waste used can reach over 10% and 50% of the total solid raw materials, respectively. The research and development of non-fired bricks based on activated dyeing and printing sludge-bonded construction waste can facilitate the implementation of projects in the construction field, reducing the use of resource- and energy-intensive raw materials and achieving high-efficiency and high-value-added utilization of solid waste. Simultaneously, it reduces the production cost of non-fired brick materials, shortens the curing period, reduces energy consumption during production, and improves production efficiency without changing the production process.

[0097] Sludge-fired non-fired bricks can reduce production costs in terms of raw material usage. Taking 95 bricks as an example, specific comparisons are shown in Tables 1 and 2:

[0098]

[0099] Table 1---Preparation cost of ordinary non-fired bricks

[0100]

[0101] Table 2---Preparation cost of sludge-fired bricks

[0102] By comparing and analyzing Tables 1 and 2, it can be seen that, under the same preparation of 1 cubic meter of bricks, the preparation cost of the sludge-free bricks of this application is approximately half that of the preparation cost of ordinary non-fired bricks.

[0103] As shown in Table 3, regarding the maintenance period:

[0104]

[0105] Table 3---Comparison of Curing Ages between Ordinary Non-fired Bricks and Sludge Non-fired Bricks

[0106] The sludge-fired non-fired bricks prepared by this method have a shorter curing period and lower maintenance costs, which can greatly improve the yield and production efficiency of non-fired bricks. See the preparation steps and corresponding curing scheme in Example 1 above for details.

[0107] Example 2

[0108] A second aspect of this application provides a system for preparing the aforementioned non-fired bricks, comprising:

[0109] The dyeing and printing sludge activation and pulverization unit is used to activate and pulverize the dyeing and printing sludge raw material to obtain dyeing and printing sludge activated raw material of 100 mesh and below.

[0110] The construction waste crushing unit is used to crush construction waste to obtain fine aggregate.

[0111] The weighing unit is used to weigh out the dyeing sludge, construction waste, fly ash and activator according to the formula.

[0112] The mixing unit is used to mix and stir the measured dyeing sludge, construction waste, fly ash and activator to obtain a uniform slurry.

[0113] The prehydration unit is used to prehydrate the homogeneous slurry to obtain a prehydrated cemented semi-dry material.

[0114] The brick blank forming unit is used to press the obtained semi-dry material into brick blanks;

[0115] The brick curing unit is used to cure the brick blanks at 60-80℃ for 8-12 hours to obtain non-fired bricks made from activated dyeing sludge cemented with construction waste.

[0116] The specific preparation equipment and corresponding conditions used in each unit can be selected by those skilled in the art and implemented according to the preparation method described in Example 1 to prepare non-fired bricks made from activated dyeing and printing sludge cemented with construction waste.

[0117] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for preparing non-fired bricks based on activated dyeing and printing sludge cemented construction waste, characterized in that, The preparation steps include the following: The dyeing and printing sludge raw material is activated and pulverized to obtain activated dyeing and printing sludge raw material with a mesh size of 100 or smaller. Construction waste is crushed to obtain fine aggregate from construction waste. Weigh out the dyeing and printing sludge, construction waste, fly ash and activator according to the formula, and mix them to obtain a uniform slurry. The homogeneous slurry is pre-hydrated to obtain a pre-hydrated cemented semi-dry material; The obtained semi-dry material is pressed to obtain brick blanks; The brick blanks are cured under preset curing conditions to obtain non-fired bricks made from activated dyeing and printing sludge cemented with construction waste.

2. The method for preparing non-fired bricks based on activated dyeing and printing sludge-bonded construction waste as described in claim 1, characterized in that, The dyeing and printing sludge raw material is activated to obtain activated dyeing and printing sludge raw material with a mesh size of 100 or smaller, including: The raw material of dyeing and printing sludge is chemically activated through enzyme catalysis, hydrothermal treatment, organic matter removal, filtration, and drying processes. The chemically activated dyeing and printing sludge raw material is ground using a mechanical grinding process to achieve physical activation, resulting in activated dyeing and printing sludge raw material ground to 100 mesh or less.

3. The method for preparing non-fired bricks based on activated dyeing and printing sludge-bonded construction waste as described in claim 1, characterized in that, The activator is a mixture of calcium oxide, alkali metal silicate / alkaline earth metal silicate and water.

4. The method for preparing non-fired bricks based on activated dyeing and printing sludge-bonded construction waste as described in claim 3, characterized in that, The homogeneous slurry is made by mixing and stirring dyeing sludge, crushed construction waste, fly ash, calcium oxide, alkali metal silicate / alkaline earth metal silicate and water in a mass ratio of 1:(4-6):(0.8-1.7):(0.15-0.25):(0.9-1.1):(1.1-1.3).

5. The method for preparing non-fired bricks based on activated dyeing and printing sludge-bonded construction waste as described in claim 4, characterized in that, The homogeneous slurry is pre-hydrated to obtain a pre-hydrated, cemented, semi-dry material, comprising: Prepare a constant temperature chamber and set the temperature to 20-25℃; The uniform slurry is placed in the constant temperature box for pre-hydration, so that the calcium and silicate in the uniform slurry system react under alkaline conditions to generate hydrated calcium silicate and coat the surface of the construction waste, thereby improving the physical properties of the construction waste. At the same time, the fluidity of the slurry is reduced to a level that facilitates the pressing and molding of brick blanks. After prehydration for 5-10 minutes, the resulting mud is broken up to obtain a prehydrated cemented semi-dry material.

6. The method for preparing non-fired bricks based on activated dyeing and printing sludge-bonded construction waste as described in claim 1, characterized in that, The obtained semi-dry material is pressed to obtain brick blanks, including: The resulting semi-dry material is loaded into the mold of a pressure brick making machine and pressed for 15 seconds using a pressure of 30-1000kN to obtain a brick blank.

7. The method for preparing non-fired bricks based on activated dyeing and printing sludge-bonded construction waste as described in claim 1, characterized in that, The brick blanks are cured under preset curing conditions to obtain non-fired bricks made from activated dyeing and printing sludge-bonded construction waste, including: The brick blanks are cured at 60-80℃ for 8-12 hours to obtain non-fired bricks made from activated dyeing sludge cemented with construction waste.

8. A system for preparing non-fired bricks according to any one of claims 1-7, characterized in that, include: The dyeing and printing sludge activation and pulverization unit is used to activate and pulverize the dyeing and printing sludge raw material to obtain dyeing and printing sludge activated raw material of 100 mesh and below. The construction waste crushing unit is used to crush construction waste to obtain fine aggregate. The weighing unit is used to weigh out the dyeing sludge, construction waste, fly ash and activator according to the formula. The mixing unit is used to mix and stir the measured dyeing sludge, construction waste, fly ash and activator to obtain a uniform slurry. The prehydration unit is used to prehydrate the homogeneous slurry to obtain a prehydrated cemented semi-dry material. The brick blank forming unit is used to press the obtained semi-dry material into brick blanks; The brick curing unit is used to cure the brick blanks at 60-80℃ for 8-12 hours to obtain non-fired bricks made from activated dyeing sludge cemented with construction waste.

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