High-efficiency dehydrating agent for engineering residual soil artificial stone and preparation method and application thereof

Abstract

An engineering residual soil artificial stone deep efficient dewatering agent, including inorganic matter, organic matter and surfactant, the mass ratio of inorganic matter, organic matter and surfactant is (0.5-2):1:(0.5-2), the organic matter is cationic polyacrylamide, the surfactant is sodium dodecyl sulfonate, and the inorganic matter is a mixture of sodium carbonate and sodium bicarbonate with a mass ratio of 1:1, experiments prove that the dewatering agent in the process of application to artificial stone manufacturing, the inorganic ecological stone porosity of pressing is low, the strength is large, it is the complex of inorganic dewatering agent, organic dewatering agent and surfactant, and fully meets the requirements of artificial stone performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chemical materials, and in particular to an engineering residual sludge soil artificial stone deep efficient dewatering agent and a preparation method and application thereof. BACKGROUND

[0002] In modern construction engineering, a large amount of residual sludge soil is a common problem, which is usually regarded as waste and needs to be properly treated. However, with the progress of science and technology and the enhancement of environmental awareness, people begin to transform the residual sludge soil into useful building materials, for example, using engineering residual sludge soil to manufacture artificial stone, which can reduce the consumption of natural resources. However, in the process of manufacturing artificial stone, the artificial stone needs to be dewatered, and the commonly used dewatering agents include inorganic dewatering agents, organic polymer dewatering agents, composite dewatering agents, and biological dewatering agents. Cationic polyacrylamide is an organic polymer dewatering agent and is the most widely used sludge dewatering conditioner at present. However, when cationic polyacrylamide is used as a dewatering agent in the manufacture of artificial stone, the prepared artificial stone has a large porosity and low compressive strength, which cannot meet the performance requirements of artificial stone. SUMMARY

[0003] Therefore, the present application provides an engineering residual sludge soil artificial stone deep efficient dewatering agent and a preparation method and application thereof, which solves the technical problem that the prepared artificial stone has a large porosity and low compressive strength when cationic polyacrylamide is used as a dewatering agent.

[0004] The technical solution of the present application to solve the above technical problems is as follows:

[0005] An engineering residual sludge soil artificial stone deep efficient dewatering agent comprises inorganic matter, organic matter, and a surfactant, and the mass ratio of the inorganic matter, the organic matter, and the surfactant is (0.5-2):1:(0.5-2). The organic matter is cationic polyacrylamide, the surfactant is sodium dodecyl sulfonate, and the inorganic matter is a mixture of sodium carbonate and sodium bicarbonate with a mass ratio of 1:1.

[0006] Preferably, the mass ratio of the inorganic matter, the organic matter, and the surfactant is (0.5-1):1:(0.5-1).

[0007] Preferably, the mass ratio of the inorganic matter, the organic matter, and the surfactant is 1:1:1.

[0008] Preferably, the molecular weight of the cationic polyacrylamide is 9-11 million, and the cationic concentration is 20%-60%.

[0009] The application discloses a preparation method of an engineering residual sludge soil artificial stone deep efficient dewatering agent.

[0010] The application discloses an application of the engineering residual sludge soil artificial stone deep efficient dewatering agent in preparation of artificial stone.

[0011] Preferably, the preparation of the artificial stone comprises the following steps.

[0012] S1. crushing and grinding the construction waste and mixing the construction waste with the fly ash at a ratio of 5:1 to prepare experimental soil;

[0013] S2. respectively weighing the pre-calculated experimental soil and water, and stirring the experimental soil and the water to obtain semi-solid experimental soil;

[0014] S3. stirring and mixing the semi-solid experimental soil with the composite curing agent and the dispersing agent according to a proportioning ratio, and then adding the engineering residual sludge soil artificial stone deep efficient dewatering agent according to any one of claims 1-4, and stirring the mixture uniformly;

[0015] S4. pouring the mixed sample soil into a mold, and then performing vacuum vibration and high-pressure pressing and dewatering to obtain a test block;

[0016] S5. curing the test block.

[0017] Preferably, the stirring speed in the step S3 is 50-180 r / min, the stirring time is 15-40 min, and the pressure is 15 Mpa.

[0018] Preferably, the vibration time in the step S4 is 2 min, and the high-pressure pressure is 15 Mpa.

[0019] The technical scheme adopted in the application can achieve the following beneficial effects:

[0020] The application discloses an engineering residual sludge soil artificial stone deep efficient dewatering agent, which comprises cationic polyacrylamide, and a certain component of a surfactant (sodium dodecyl sulfonate) and a combination of sodium carbonate and sodium bicarbonate are added to the cationic polyacrylamide to prepare a high-efficient dewatering agent; experiments prove that, in the process of applying the high-efficient dewatering agent to the preparation of artificial stone, the prepared artificial stone has low porosity and high compressive strength, and meets the performance requirements of the artificial stone. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A porosity curve of the artificial stone after 28 days of curing.

[0022] Figure 2 A compressive strength curve of the artificial stone after 28 days of curing.

[0023] Specific experimental methods

[0024] For the purposes of this application, the application will be more fully described in the following with reference to the relevant experimental examples. The experimental examples set forth a preferred experimental mode of the application. However, the application can be embodied in many different forms and should not be construed as limited to the experimental modes set forth herein. Rather, these experimental modes are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art.

[0025] 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 application belongs. The terminology used in the description of the application herein is for the purpose of describing particular experimental modes only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0026] The application will be further described in the following with reference to the experimental examples.

[0027] Experimental Example 1

[0028] An engineering residual soil artificial stone deep efficient dewatering agent, comprising inorganic matter, organic matter and surfactant, the organic matter is cationic polyacrylamide, the surfactant is sodium dodecyl sulfonate, the inorganic matter is a mixture of sodium carbonate and sodium bicarbonate with a mass ratio of 1:1, the molecular weight of the cationic polyacrylamide is 9-11 million, and the cationic concentration is 20%-60%.

[0029] The inorganic matter sodium carbonate, sodium bicarbonate, surfactant sodium dodecyl sulfonate, and cationic polyacrylamide were weighed and configured according to the proportions described in the following table to prepare dewatering agents A1-A16:

[0030] Table 1 Dewatering agent proportioning composition table

[0031]

[0032] Experimental Example 2

[0033] The dewatering agents A1-A16 configured in Experimental Example 1 were used to make artificial stone.

[0034] The experimental soil used inorganic solid waste and fly ash in the construction and engineering industry as the main material, and the fly ash was F-class secondary fly ash.

[0035] Table 2 Main chemical composition of slag (%)

[0036]

[0037] Table 3 Fly ash property parameters (%)

[0038]

[0039] A preparation method of artificial stone made of engineering residual soil, comprising the following raw materials prepared by weight parts: 20 parts of curing agent, 63.5 parts of screened and filtered experimental soil, 12.5 parts of dispersing agent, and 4 parts of dehydrating agent, wherein the dehydrating agent is dehydrating agent A1-A16 in the above-mentioned comparative examples, and artificial stone test blocks Y1-Y16 are respectively prepared, and the steps are as follows:

[0040] S1. The construction waste is crushed and ground, mixed with fly ash at a ratio of 5:1, crushed, sieved, baked, and organic matter and impurities are removed to prepare experimental soil. The pre-calculated experimental soil and water are stirred uniformly to obtain semi-solid experimental soil.

[0041] S2. The semi-solid experimental soil, the composite curing agent, and the dispersing agent are mixed according to the ratio, the stirring speed is 180 r / min, and the stirring time is 40 min; then the dehydrating agent is added, the stirring speed is 50 r / min, and the stirring time is 15 min.

[0042] S3. The mixed sample soil is poured into a mold, vacuumed and vibrated for 2 min, and then dehydrated by high-pressure pressing with a pressure of 15 Mpa to obtain a test block.

[0043] S4. After demolding, the test block is placed in a natural environment for curing.

[0044] After natural curing for 28 days, the porosity and compressive strength of the artificial stone test blocks Y1-Y16 are detected. The porosity is calculated using the following formula, and the compressive strength is tested by loading the test block on an electronic universal testing machine at a speed of 0.02 mm / s until the test piece is destroyed, and the maximum compressive failure load is recorded.

[0045] The calculation formula of the porosity P of the artificial stone is:

[0046] P is the porosity of the artificial stone, %;

[0047] V0 is the volume of the material in a natural state, or the apparent volume, cm 3 or m 3 ; ρ0 is the volume density of the raw material, g / cm 3 or kg / m 3 ;

[0048] V is the absolute compacted volume of the material, cm 3 or m 3 ; ρ is the density of the artificial stone, g / cm 3 or kg / m 3 .

[0049]

[0050] Table 4 artificial stone material ratio summary table

[0051]

[0052] Table 5 artificial stone porosity and compressive strength table after curing for 28 days

[0053]

[0054] As shown in Tables 1 and 5, when the experimental example one only uses cationic polyacrylamide to make artificial stone, the porosity is larger and the compressive strength is lower under the same preparation steps; when cationic polyacrylamide is added with inorganic sodium carbonate, sodium bicarbonate or surfactant sodium dodecyl sulfonate to make artificial stone, the porosity and compressive strength change little; even if the ratio of inorganic matter or surfactant sodium dodecyl sulfonate is changed, the porosity and compressive strength still change little; when the mass ratio of cationic polyacrylamide, inorganic matter and sodium dodecyl sulfonate is 1:0.5:0.5, the porosity of the artificial stone made is reduced and the compressive strength is improved, but when the mass ratio of cationic polyacrylamide, inorganic matter and sodium dodecyl sulfonate is 1:2:2, the porosity of the artificial stone made is increased and the compressive strength is reduced.

[0055] In summary, the porosity and the compressive strength are inversely proportional, the lower the porosity of the artificial stone, the higher the compressive strength, and vice versa. The improvement effect is best when the mass ratio of cationic polyacrylamide, inorganic matter and sodium dodecyl sulfonate is 1:1:1, the porosity of the artificial stone sample reaches 0.156% after natural curing for 28 days, and the compressive strength can reach 40 MPa.

[0056] It should be noted that the high-efficiency dewatering agent mainly removes the water wrapped in the colloid in the sludge, and can remove the wrapped water and disperse the soil particles, so that the fine particles do not re-agglomerate, and the inorganic ecological stone has low porosity and high strength, which is a composite of inorganic dewatering agent, organic dewatering agent and surfactant.

[0057] The above-described embodiments only express the device layout of the present application, which is described in detail, but should not be construed as limiting the scope of the patent application; it should be noted that for ordinary skilled persons in the art, some adjustments and improvements can be made without departing from the concept of the present application, which are within the scope of the present application; therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A highly efficient dewatering agent for engineered sludge soil artificial stone, characterized by, The inorganic substance, the organic substance and the surfactant are made of inorganic substance, organic substance and surfactant, and the mass ratio of inorganic substance, organic substance and surfactant is (0.5-2):1:(0.5-2), the organic substance is cationic polyacrylamide, the molecular weight of cationic polyacrylamide is 9-11 million, the cationic concentration is 20%-60%, the surfactant is sodium dodecyl sulfonate, and the inorganic substance is a mixture of sodium carbonate and sodium bicarbonate with a mass ratio of 1:

1.

2. The engineered sludge soil artificial stone depth efficient dewatering agent according to claim 1, characterized in that, The mass ratio of the inorganic substance, the organic substance and the surfactant is (0.5-1):1:(0.5-1).

3. The depth efficient de-watering agent for engineered sludge soil artificial stone according to claim 1, wherein, The mass ratio of the inorganic substance, the organic substance and the surfactant is 1:1:

1.

4. A method of preparing the highly efficient dewatering agent for engineered sludge-soil artificial stone according to claim 1, characterized in that, The following steps are included: the sodium carbonate, sodium bicarbonate, sodium dodecyl sulfonate and cationic polyacrylamide are weighed according to the process ratio and mixed.

5. The use of the highly efficient dewatering agent for engineered sludge stone according to any one of claims 1-3 in the preparation of artificial stone, characterized in that, The artificial stone prepared by the method has a porosity of less than 0.623% and a compressive strength of more than 24.88 MPa.

6. The use of the engineered sludge soil artificial stone depth efficient dewatering agent according to claim 5, characterized in that, The method for preparing artificial stone comprises the following steps: S1. Crush and grind the construction waste and mix it with fly ash at a ratio of 5:1 to prepare experimental soil; S2. Weigh the pre-calculated experimental soil and water respectively and stir them uniformly to obtain semi-solid experimental soil; S3. Stir and mix the semi-solid experimental soil with the composite curing agent and the dispersing agent according to the ratio, and then add the engineering residual soil artificial stone deep dehydration agent according to any one of claims 1-3, and stir uniformly; S4. Pour the mixed sample soil into a mold, and after vacuum vibration, high-pressure compression dehydration is carried out to obtain a test block; S5. The test block is cured.

7. The use of the highly efficient dewatering agent for engineered slurry soil artificial stone according to claim 6, characterized in that, The vibration time of the step S4 is 2 min, and the high-pressure compression intensity is 15 MPa.

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