Method for treating and recycling waste slurry

Abstract

The invention relates to the technical field of building waste slurry recovery, in particular to a waste slurry treatment and recycling method which comprises the following steps: S1, sampling a waste slurry source to obtain a waste slurry sample, and dividing the waste slurry sample into a plurality of sub-samples; s2, performing analysis and determination of different items on the plurality of sub-samples to obtain waste slurry data, the waste slurry data including waste slurry element composition, compound content, particle size, solid-to-liquid ratio, density, viscosity and pH value; s3, constructing a target product performance model, and calculating to obtain the optimal addition amount of the waste slurry through the target product performance model; s4, adding a diluent to pre-treat the waste slurry to obtain diluted waste slurry; and S5, mixing the diluted waste slurry with cement according to the optimal addition amount of the waste slurry to obtain the recycled concrete. According to the method, the recycled concrete meeting the target requirement can be produced by utilizing the waste slurry.

Description

Technical Field

[0001] The invention relates to the technical field of construction waste slurry recycling, and in particular to a method for treating and recycling waste slurry. Background Art

[0002] In many industrial production activities, especially in the construction industry, a large amount of waste slurry is generated. If these waste slurries are discharged directly without proper treatment, they will not only cause serious pollution to the natural environment such as soil and water bodies, but also lead to the waste of valuable components contained in them (such as unhydrated cement particles and sand and gravel aggregates), which does not meet the current requirements of sustainable development and resource recycling.

[0003] The existing methods for treating waste slurry, such as simple landfill, not only occupy a large amount of land, but also may cause secondary pollution and cannot be used as resources; direct discharge will pollute water bodies, affect the operation of urban infrastructure and waste resources; the simple solidification treatment method lacks in-depth analysis of the characteristics of waste slurry, and the amount of curing agent added lacks scientific basis, resulting in unstable product quality and low recycling rate. In contrast, this technology samples the source of waste slurry and conducts multi-item analysis and measurement to deeply understand its characteristics, builds a target product performance model to scientifically determine the optimal amount of waste slurry added, the amount of diluent added and the mixing time, and monitors the slump in real time during the mixing process and automatically fine-tunes it to ensure the quality of recycled concrete, greatly improving the recycling value of waste slurry. Summary of the invention

[0004] The object of the present invention is to provide a method for treating and recycling waste pulp to solve the problems mentioned in the above background technology.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a method for treating and recycling waste pulp, the method for treating and recycling waste pulp comprising the following steps:

[0006] S1. Sampling the waste pulp source to obtain a waste pulp sample, and dividing the waste pulp sample into several sub-samples;

[0007] S2. Analyze and measure different items of several sub-samples to obtain waste pulp data.

[0008] The waste pulp data include waste pulp element composition, compound content, particle size, solid-liquid ratio, density, viscosity and pH value;

[0009] S3, constructing a target product performance model, and calculating the optimal amount of waste pulp added through the target product performance model;

[0010] S4, adding a diluent to pre-treat the waste slurry to obtain diluted waste slurry;

[0011] S5. Mix the diluted waste slurry with cement according to the optimal amount of waste slurry added to obtain recycled concrete.

[0012] Further, step S2 includes the following steps:

[0013] S21. Performing element analysis on the waste pulp sample by X-ray fluorescence spectroscopy or inductively coupled plasma emission spectroscopy analysis technology to obtain waste pulp element data;

[0014] S22, determining the compound content in the waste pulp sample by acid-base titration to obtain compound content data;

[0015] S23, screening the waste pulp sample using standard sieves with different apertures to obtain waste pulp particle data;

[0016] S24, using a centrifuge to separate solids and liquids in the waste slurry sample to obtain solid-liquid ratio data of the waste slurry;

[0017] S25. Determine the density data of the waste pulp sample using the pycnometer method;

[0018] S26, using a rotational viscometer to measure the viscosity data of the waste pulp sample;

[0019] S27. Use a pH meter to measure pH data of the waste pulp sample.

[0020] Furthermore, in step S24, the separated solid is analyzed by electron microscopy to obtain the organizational morphology and structural characteristic data of the solid.

[0021] Furthermore, in step S3, the mathematical expression of the target product performance model is shown in Formula 1 and Formula 2:

[0022] f cu,k =A×(1-x)+B×x×f sp

[0023] Formula 1

[0024] SL=C×(1-x)+D×x×SL s

[0025] Formula 2

[0026] In formula 1, f cu,k is the target compressive strength of recycled concrete, x is the optimal amount of waste slurry added, A is the calculated compressive strength of pure concrete without adding waste slurry, B is the coefficient of waste slurry contribution to concrete compressive strength, f sp It indicates the potential strength contribution value of the effective components in the waste pulp;

[0027] In formula 2, SL is the target slump of recycled concrete, C is the initial slump of pure concrete, D is the coefficient of waste slurry on slump, and SLs is the slump contribution value of the waste slurry itself, and x is the optimal amount of waste slurry added.

[0028] Furthermore, f sp The result is obtained by combining the micro-component analysis of waste pulp with the strength test, and through data fitting, the relationship between the proportion of effective components in waste pulp and its strength contribution is established.

[0029] Furthermore, the D value is determined by setting up multiple groups of concrete tests with different amounts of waste slurry added, controlling other variables to be the same, and comparing the changes in the slump of concrete in different groups, so as to determine the coefficient of influence of waste slurry on slump.

[0030] Furthermore, SL s The value is prepared by mixing the undiluted waste slurry with the standard cement slurry (without aggregate) to prepare a fluidity test sample. The slump of the mixture is tested using a slump cone, and the measured value is SL s .

[0031] Furthermore, B is obtained by making recycled concrete test blocks with different waste slurry addition amounts, measuring the compressive strength of the recycled concrete test blocks, obtaining compressive strength data, and performing data fitting on the compressive strength data.

[0032] Further, in step S4, the amount of diluent added is calculated by mathematical expression Formula 3, which is as follows:

[0033]

[0034] In formula 3, η ′ is the target viscosity value expected to be achieved by the diluted waste pulp, η is the waste pulp viscosity, and y is the amount of diluent added.

[0035] Furthermore, in step S5, the mixing method is specifically as follows: putting the formulated aggregate and 45%-60% of the formulated cement into a mixer for pre-mixing, and continuing to add the diluted waste slurry with the optimal amount of waste slurry and the remaining cement into the mixer for sufficient mixing to obtain recycled concrete.

[0036] Furthermore, the formulated aggregate and 60% of the formulated cement are put into a mixer for pre-mixing.

[0037] In the above technical solution, 60% of cement is first added for pre-mixing in order to initially coat the aggregate surface with cement slurry to form a certain coating layer, which helps to disperse more evenly when subsequently mixed with waste slurry and remaining cement, thereby improving the homogeneity of the recycled concrete.

[0038] Furthermore, the sufficient stirring time is calculated by mathematical expression formula 4, which is as follows:

[0039] t=E×(1+x)

[0040] Formula 4

[0041] In formula 4, E is the reference value of the mixing time of pure concrete without adding waste slurry, and x is the optimal amount of waste slurry added.

[0042] Furthermore, in step S5, during the mixing of the diluted waste slurry and cement, a slump monitor is set to obtain the slump value of the recycled concrete in real time.

[0043] In the above technical solution, the slump monitor is a sensor that measures the height change of the recycled concrete mixture after slump and expansion to obtain the slump value. Based on the reflection and refraction characteristics of laser or ultrasonic waves, when the concrete is in different slump states, the signal feedback sent by the sensor is different, which is converted into the corresponding slump value after being processed by the built-in algorithm and displayed. Once the slump is detected to deviate from the preset target value to a certain range, the amount of waste slurry or other related raw materials added can be automatically fine-tuned according to the preset adjustment strategy. Through this real-time automated control mechanism, the quality of the final product is ensured to remain stable and meet the expected quality standards.

[0044] The beneficial effects of the present invention are:

[0045] The present invention constructs a target product performance model based on the performance requirements of the target product recycled concrete, determines the optimal amount of waste slurry added, and uses a formula to calculate the amount of diluent added and the mixing time, thereby achieving precise control of the waste slurry viscosity and the uniformity and stability of the recycled concrete, making full use of construction waste slurry and ensuring the product quality of recycled concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0047] Figure 1 The present invention is a flow chart of the method for treating and recycling waste pulp. DETAILED DESCRIPTION

[0048] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0049] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0050] The present invention is now further described in conjunction with specific examples. The following examples are only for explaining the present invention, but do not constitute a limitation of the present invention. The test samples and test processes used in the following examples include the following (if the specific experimental conditions are not indicated in the examples, they are usually in accordance with conventional conditions or the conditions recommended by the reagent company; the reagents, consumables, etc. used in the following examples, if not otherwise specified, can all be obtained from commercial channels).

[0051] Example

[0052] like Figure 1 As shown, a method for treating and recycling waste pulp comprises the following steps:

[0053] S1. Sampling the waste pulp source to obtain a waste pulp sample, and dividing the waste pulp sample into several sub-samples;

[0054] S2. Analyze and measure different items of several sub-samples to obtain waste pulp data.

[0055] The waste pulp data include waste pulp element composition, compound content, particle size, solid-liquid ratio, density, viscosity and pH value;

[0056] S3, constructing a target product performance model, and calculating the optimal amount of waste pulp added through the target product performance model;

[0057] S4, adding a diluent to pre-treat the waste slurry to obtain diluted waste slurry;

[0058] S5. Mix the diluted waste slurry with cement according to the optimal amount of waste slurry added to obtain recycled concrete.

[0059] In this embodiment, step S1 is specifically as follows: a plurality of waste slurry samples are collected from different positions of the waste slurry collection pool of the concrete mixing station using a special sampling tool, with a total amount of about 5L, and the collected waste slurry is placed in a sealed barrel with a stirring paddle, and stirred at a speed of 200r / min for 10 minutes to make it fully and evenly mixed. Then, the uniform waste slurry is divided into multiple 500ml sealed plastic bottles and brought back to the laboratory. In the laboratory, the waste slurry in each plastic bottle is poured into different clean containers to obtain multiple sub-samples for subsequent analysis.

[0060] Step S2 includes the following steps:

[0061] S21. Performing element analysis on the waste pulp sample by X-ray fluorescence spectroscopy or inductively coupled plasma emission spectroscopy analysis technology to obtain waste pulp element data;

[0062] S22, determining the compound content in the waste pulp sample by acid-base titration to obtain compound content data;

[0063] S23, screening the waste pulp sample using standard sieves with different apertures to obtain waste pulp particle data;

[0064] S24, using a centrifuge to separate solids and liquids in the waste slurry sample to obtain solid-liquid ratio data of the waste slurry;

[0065] S25. Determine the density data of the waste pulp sample using the pycnometer method;

[0066] S26, using a rotational viscometer to measure the viscosity data of the waste pulp sample;

[0067] S27. Use a pH meter to measure pH data of the waste pulp sample.

[0068] In this embodiment, step S21 measures the calcium content in the waste slurry by an X-ray fluorescence spectrometer (XRF) analyzer to be approximately 25%, the silicon content to be approximately 12%, the aluminum content to be approximately 3%, the iron content to be approximately 2%, and the remainder to be other elements. The approximate proportion of cement-related components in the waste slurry can be obtained through the waste slurry element data, providing a basis for subsequent calculations.

[0069] Step S22 uses an acid-base titration method to determine the content of calcium hydroxide in the waste slurry. The specific steps are to take 50 g of waste slurry, titrate it with a standard hydrochloric acid solution of known concentration (0.1 mol / L), use phenolphthalein as an indicator, and calculate the calcium hydroxide content of 10 wt% (mass fraction) based on the volume of hydrochloric acid consumed (the average value is taken after multiple parallel measurements) through a stoichiometric relationship. The compound content data can be used to evaluate the degree of hydration of cement in the waste slurry, thereby assisting in the subsequent judgment of the activity of the waste slurry.

[0070] Step S23 is specifically as follows: 1000g of waste slurry is passed through a set of standard sieves with apertures of 4.75mm, 2.36mm, 1.18mm, 0.60mm, 0.30mm, and 0.15mm, and sieved in turn, the mass of the residue on each sieve is weighed, and the proportion of waste slurry particles in different particle size ranges is calculated for reference in the design of recycled concrete mix ratio.

[0071] Step S24 is specifically as follows: 500 ml of waste slurry is placed in a high-speed centrifuge, the speed is set to 3000 r / min, and the centrifugation time is 15 minutes to separate solid particles from liquid. After separation, the solid mass is measured to be 200 g, the liquid mass is 300 g, and the solid-liquid ratio is calculated to be 2:3. At the same time, a small amount of solid particles after centrifugation is taken and observed using a scanning electron microscope (SEM), and it is found that some unhydrated cement particles are agglomerated, and there is a certain amount of hydration products attached to the particle surface, which provides a basis for subsequent pretreatment.

[0072] Step S25 is as follows: select a clean pycnometer with a volume of 250 ml, first weigh the pycnometer to obtain a mass of 100 g, fill the pycnometer with waste pulp and obtain a total mass of 600 g, and calculate the waste pulp density according to the formula During the measurement, the laboratory temperature was controlled at 25°C and recorded to ensure the accuracy of the density measurement.

[0073] Step S26 is specifically as follows: using a rotary viscometer, setting the rotor speed to 60 r / min, pouring 200 ml of waste pulp into the viscometer measuring container, starting the viscometer, and recording the viscosity value as 300 mPa·s after the reading is stable. During the measurement, the waste pulp temperature is maintained at 25°C by a thermostat, and the temperature information is recorded so that temperature correction can be performed when necessary.

[0074] Step S27 is specifically as follows: the pH value of the waste pulp is measured with a pH meter, the pH meter electrode is inserted into the waste pulp, and the pH value is gently stirred for 2 minutes. After the pH meter reading is stable, the pH value displayed is 12. Before the measurement, the pH meter is calibrated with standard buffer solutions of pH = 4.00, 6.86, and 9.18 to ensure accurate measurement, and the electrode is rinsed with distilled water and the water is absorbed after each measurement to keep the electrode clean.

[0075] In step S3, the mathematical expression of the target product performance model is shown in equations 1 and 2:

[0076] f cu,k =A×(1-x)+B×x×f sp

[0077] Formula 1

[0078] SL=C×(1-x)+D×x×SL s

[0079] Formula 2

[0080] In formula 1, f cu,k is the target compressive strength of recycled concrete, x is the optimal amount of waste slurry added, A is the calculated compressive strength of pure concrete without adding waste slurry, B is the coefficient of waste slurry contribution to concrete compressive strength, f spIt indicates the potential strength contribution value of the effective components in the waste pulp;

[0081] In formula 2, SL is the target slump of recycled concrete, C is the initial slump of pure concrete, D is the coefficient of waste slurry on slump, and SL s is the slump contribution value of the waste slurry itself, and x is the optimal amount of waste slurry added.

[0082] In this embodiment, the design compressive strength of the target recycled concrete is f cu,k 30MPa (C30 concrete). Through a large number of previous tests, it is known that the calculated compressive strength value A of pure concrete without adding waste slurry is 35MPa (calculated based on the established pure concrete mix ratio and material properties). The coefficient B of waste slurry contribution to concrete compressive strength is obtained by making concrete test blocks with different waste slurry addition amounts (0%, 10%, 20%, 30%, etc.), and conducting compressive strength tests after curing for 28 days. The B value is about 0.6 after data fitting. The potential strength contribution value f of the effective components in waste slurry is sp The microscopic analysis of the bonding strength test determined that it is 15MPa. According to the compressive strength relationship formula f cu,k =A×(1-x)+B×x×f sp , substituting the data into the equation:

[0083] 30=35×(1-x)+0.6×x×15

[0084] Solving the equation, we can get the waste pulp addition amount x to be approximately 20% (expressed as a percentage of the total material mass).

[0085] At the same time, considering the working performance, it is known that the calculated initial slump value C of pure concrete is 160mm, the coefficient D of the influence of waste slurry on slump is 0.8 through comparative test, and the slump contribution value SL of waste slurry itself is s The target slump value SL of recycled concrete is 50mm, and the target slump value SL is set to 180mm. According to the working performance adjustment formula SL=C×(1-x)+D×x×SL s , substitute each value to verify whether the slump under the added amount meets the expected requirements, and the calculation results are:

[0086] 180 = 160 × (1-0.2) + 0.8 × 0.2 × 50

[0087] The equation is established, indicating that the amount of waste slurry added can meet both the compressive strength requirements and the slump requirements.

[0088] In step S4, the amount of diluent added is calculated by mathematical expression formula 3, which is as follows:

[0089]

[0090] In formula 3, η ′ is the target viscosity value expected to be achieved by the diluted waste pulp, η is the waste pulp viscosity, and y is the amount of diluent added.

[0091] In this embodiment, according to the mixing process requirements, the target viscosity value η of the waste slurry after dilution is expected to be ′ is 200mPa·s. It is known that the initial viscosity η of the waste slurry is 300mPa·s. According to the formula We can get:

[0092]

[0093] Solving the equation, we can get the amount of diluent (water) added, y, to be 0.5 (i.e., 50%, the addition ratio relative to the initial mass of the waste slurry). Before dilution, the waste slurry is screened using a vibrating screen with a screen aperture of 4.75 mm to remove impurities such as large aggregate particles with a particle size greater than 4.75 mm in the waste slurry to ensure the rationality of the grade and quality stability of the recycled concrete. After screening, slowly add an appropriate amount of water to the waste slurry according to the calculated ratio and stir evenly to make the viscosity of the waste slurry reach the target value.

[0094] In step S5, the mixing method is specifically as follows: putting the formulated aggregate and 45%-60% of the formulated cement into a mixer for pre-mixing, and then adding the diluted waste slurry with the optimal amount of waste slurry and the remaining cement into the mixer for sufficient mixing to obtain recycled concrete.

[0095] The sufficient stirring time is calculated by mathematical expression formula 4, which is as follows:

[0096] t=E×(1+x)

[0097] Formula 4

[0098] In formula 4, E is the reference value of the mixing time of pure concrete without adding waste slurry, and x is the optimal amount of waste slurry added.

[0099] In this embodiment, a forced mixer is used for material mixing. Aggregates and 60% of the designed cement dosage are first put into the mixer and pre-mixed at a speed of 30r / min for 30 seconds. Then, according to the calculated optimal amount of waste slurry, the diluted waste slurry and the remaining 40% of cement and an appropriate amount of admixture (water reducing agent, etc., the dosage is determined according to the mix ratio) are slowly added. The mixing time t is calculated according to the formula t=E×(1+x). It is known that the mixing time reference value E of pure concrete without adding waste slurry is 90 seconds, and the mixing time t=90×(1+0.2)=108 seconds is obtained. Stirring is continued according to this mixing time to ensure that all materials are fully mixed and uniform.

[0100] During the entire production process, the slump of concrete is monitored in real time using an online slump monitor. When the slump deviates from the target value (180mm) within ±10mm, the control system automatically fine-tunes the amount of admixture added to ensure that the working performance of the recycled concrete is stable and meets construction requirements.

[0101] In this embodiment, the detection method of the slump monitor is as follows:

[0102] The classification model is built using a neural network based on a multi-stream ResNet34LateConvFusion architecture. Specifically, it extracts features from the three process images of concrete entering the bucket, piling up in the bucket, and exiting the bucket, and uses a multi-stream convolutional neural network flow architecture to establish three independent convolutional neural network flows for separate processing; a weight distribution model is set for the prediction results of the three process images, which is implemented using a fully connected layer, and the detection results of the three process images are integrated to obtain the final detection result that can reflect the slump range of concrete. Among them, in the multi-stream convolutional neural network stream architecture, ResNet34 is used as the basic network, and the convolution layer is set to a 1:7x7 convolution kernel, a stride of 2, a padding of 3, and an output channel of 64; the maximum pooling layer of the pooling kernel is set to 1:3x3, with a stride of 2; 3 residual blocks are set, and each residual block includes two 3x3 convolution kernels, and the output channels of each residual block are: 64, 256, and 614 respectively; for each stream, a multi-scale convolution layer is added after ResNet34, and a global average pooling layer is applied at the end of each stream; the Late Conv Fusion layer concatenates the features of the three streams after global average pooling, and then outputs the feature vector through a convolution kernel with a size of 1x1 and a channel number of 256. The weight distribution model is implemented using a fully connected layer. The feature vector output by Late Conv Fusion is used as the input of the fully connected layer. The number of output neurons in the fully connected layer is set to 3 to correspond to three categories. The fully connected layer uses the formula Y = softmax(Wf(x)+B) to predict the concrete slump category, where Wf(x) represents matrix multiplication, f(x) is the feature vector output by Late ConvFusion, W is the weight matrix of the fully connected layer, B is the bias vector of the fully connected layer, softmax is the activation function, and Y is the classification category probability.

[0103] Finally, the mixed recycled concrete was poured into a standard test mold to make concrete test blocks. They were cured to the specified age (28 days) under standard curing conditions (temperature 20±2°C, relative humidity above 95%), and the compressive strength performance test was carried out. After testing, the 28-day compressive strength of the recycled concrete reached 32MPa, and the slump was 180mm, which met the design requirements of C30 concrete, and all performance indicators were stable, verifying the effectiveness of the waste slurry recycling and reuse method.

[0104] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0105] The above is a detailed introduction to a method for treating and recycling waste pulp provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A method for treating and recycling waste pulp, characterized in that: The method for treating and recycling waste pulp comprises the following steps: S1. Sampling the waste pulp source to obtain a waste pulp sample, and dividing the waste pulp sample into several sub-samples; S2. Analyze and measure different items of several sub-samples to obtain waste pulp data. The waste pulp data include waste pulp element composition, compound content, particle size, solid-liquid ratio, density, viscosity and pH value; S3, constructing a target product performance model, and calculating the optimal amount of waste pulp added through the target product performance model; S4, adding a diluent to pre-treat the waste slurry to obtain diluted waste slurry; S5. Mix the diluted waste slurry with cement according to the optimal amount of waste slurry added to obtain recycled concrete.

2. The method for treating and recycling waste pulp according to claim 1, characterized in that: Step S2 includes the following steps: S21. Performing element analysis on the waste pulp sample by X-ray fluorescence spectroscopy or inductively coupled plasma emission spectroscopy analysis technology to obtain waste pulp element data; S22, determining the compound content in the waste pulp sample by acid-base titration to obtain compound content data; S23, screening the waste pulp sample using standard sieves with different apertures to obtain waste pulp particle data; S24, using a centrifuge to separate solids and liquids in the waste slurry sample to obtain solid-liquid ratio data of the waste slurry; S25. Determine the density data of the waste pulp sample using the pycnometer method; S26, using a rotational viscometer to measure the viscosity data of the waste pulp sample; S27. Use a pH meter to measure pH data of the waste pulp sample.

3. The method for treating and recycling waste pulp according to claim 2, characterized in that: In step S24, the separated solid is analyzed by electron microscopy to obtain the solid's tissue morphology and structural characteristic data.

4. The method for treating and recycling waste pulp according to claim 1, characterized in that: In step S3, the mathematical expression of the target product performance model is shown in equations 1 and 2: f cu,k =A×(1-x)+B×x×f sp Formula 1 SL=C×(1-x)+D×x×SL s Formula 2 In formula 1, f cu,k is the target compressive strength of recycled concrete, x is the optimal amount of waste slurry added, A is the calculated compressive strength of pure concrete without adding waste slurry, B is the coefficient of waste slurry contribution to concrete compressive strength, f sp It indicates the potential strength contribution value of the effective components in the waste pulp; In formula 2, SL is the target slump of recycled concrete, C is the initial slump of pure concrete, D is the coefficient of waste slurry on slump, and SL s is the slump contribution value of the waste slurry itself, and x is the optimal amount of waste slurry added.

5. The method for treating and recycling waste pulp according to claim 4, characterized in that: The method for obtaining B is as follows: by making recycled concrete test blocks with different waste slurry addition amounts, the compressive strength of the recycled concrete test blocks is measured to obtain the compressive strength data, and then the compressive strength data is obtained by data fitting.

6. The method for treating and recycling waste pulp according to claim 1, characterized in that: In step S4, the amount of diluent added is calculated by mathematical expression formula 3, which is as follows: In Formula 3, η′ is the target viscosity value that the waste slurry is expected to achieve after dilution, η is the viscosity of the waste slurry, and y is the amount of diluent added.

7. The method for treating and recycling waste pulp according to claim 1, characterized in that: In step S5, the mixing method is specifically as follows: putting the formulated aggregate and 45%-60% of the formulated cement into a mixer for pre-mixing, and then adding the diluted waste slurry with the optimal amount of waste slurry and the remaining cement into the mixer for sufficient mixing to obtain recycled concrete.

8. The method for treating and recycling waste pulp according to claim 7, characterized in that: Put the formulated aggregate and 60% of the formulated cement into a mixer for pre-mixing.

9. The method for treating and recycling waste pulp according to claim 7, characterized in that: The sufficient stirring time is calculated by mathematical expression formula 4, which is as follows: t=E×(1+x) Formula 4 In formula 4, E is the reference value of the mixing time of pure concrete without adding waste slurry, and x is the optimal amount of waste slurry added.

10. The method for treating and recycling waste pulp according to claim 1, characterized in that: In step S5, during the mixing of the diluted waste slurry and cement, a slump monitor is set to obtain the slump value of the recycled concrete in real time.

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