CN115197709A - Soil stabilizer with heavy metal stabilizing effect and preparation method and application thereof - Google Patents
Soil stabilizer with heavy metal stabilizing effect and preparation method and application thereof Download PDFInfo
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- CN115197709A CN115197709A CN202210829202.1A CN202210829202A CN115197709A CN 115197709 A CN115197709 A CN 115197709A CN 202210829202 A CN202210829202 A CN 202210829202A CN 115197709 A CN115197709 A CN 115197709A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2103/00—Civil engineering use
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- Soil Sciences (AREA)
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- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention belongs to the technical field of soil firming agents, and particularly relates to a soil firming agent with a heavy metal stabilizing effect, and a preparation method and application thereof. The soil stabilizer with the heavy metal stabilizing effect comprises the following raw materials in parts by weight: 10-20 parts of sodium carboxymethylcellulose, 10-20 parts of sodium polycarboxylate, 5-15 parts of calcium lignosulfonate, 15-25 parts of lithium hydroxide, 5-10 parts of pH buffering agent, 15-25 parts of iron salt, 3-6 parts of heavy metal chelating agent and 100 parts of water. The soil curing agent disclosed by the invention is stable and reliable in performance, non-toxic and harmless, has no pollution to the environment, integrates adsorption, coating, chelation, coordination, crystallization and mineralization, not only greatly improves the water resistance and pressure resistance of the cured soil, but also effectively stabilizes heavy metals contained in the soil.
Description
Technical Field
The invention belongs to the technical field of soil solidifying agents, and particularly relates to a soil solidifying agent with a heavy metal stabilizing effect, and a preparation method and application thereof.
Background
The soil stabilizer is used as a novel soil reinforcing material, is mainly used for replacing sand stone materials when building a road base, directly treats the field soil into the road base which meets the requirements of engineering, saves a large amount of material cost, shortens the construction period, greatly protects the surrounding soil environment, saves the engineering cost by 30-50%, has wide application range, stable engineering performance and simple and convenient construction, and can completely meet the requirements of different soil property construction in different areas.
Soil curing agents are introduced from the 80 s of the last century in China, but the use cost of the soil curing agents is higher than that of the traditional gravels, so that the soil curing agents cannot be widely applied. The national requirements for environmental protection are continuously improved in recent years, the prices of materials such as sand, stone and lime are continuously increased, even though the materials are started later, a rush of research climax is still raised, the soil curing agent, an environment-friendly, nontoxic and harmless novel polymer environment-friendly material with low use cost, gradually enters the public visual field, is accepted by people, and is applied to level road beds, low-level road surface parking lots, ecological park roads, river channel treatment, solid waste, slope protection, squares and the like.
For example, patent CN202111514992.6 discloses a bio-based high water resistance liquid soil curing agent, which comprises the following components in percentage by mass: 8-15 parts of water-soluble cellulose; organic matter includes biobased and biobased derivatives; inorganic substances include lithiates, calcifications and phosphaliuminates; 40 parts of a solvent. The bio-based liquid soil curing agent with high water resistance has the characteristics of greenness and reproducibility, and effectively improves the water resistance of the soil after curing. However, the adoption of a large amount of bio-based raw materials leads to low compressive strength of the solidified soil, cannot play a good role in stabilizing heavy metals, and is not suitable for the soil containing heavy metals.
Patent CN201510363434.2 discloses a soil solidifying agent and a preparation method thereof, wherein the soil solidifying agent is prepared from calcium lignosulphonate, sodium polycarboxylate, lithium hydroxide, liquid aluminum dihydrogen phosphate, illegal cooking oil, sulfamic acid and distilled water, and the pH value is between 5 and 9. The soil curing agent provided by the invention is not strong acid and alkali, not only has high use safety, no environmental pollution, strong pressure resistance and high water stability and freezing stability, but also realizes the waste utilization of the illegal cooking oil. However, the preparation method is very complicated, the composition of the illegal cooking oil is complex, and a large amount of byproducts are generated in the reaction process of the illegal cooking oil and sulfamic acid, so that the solidification of soil is not facilitated.
Patent CN201810498160.1 discloses a soil liquid curing agent, which is prepared by adding water to dilute diethanol monoisopropanolamine, sodium polycarboxylate, lignosulfonate, polyethylene OP-10 and sodium a-alkenyl sulfonate. The soil liquid curing agent provided by the invention can control dust pollution by adding into cement, effectively shortens the curing time of sludge curing, and has the advantages of small mixing amount, high strength, low cost and good curing stability effect. But the pH value is 10-12, the paint is strong alkaline, and can cause certain harm to the ecological environment when in use.
In summary, the existing liquid soil solidifying agent realizes the solidification of soil to a certain extent, and improves the water resistance and the pressure resistance of the solidified soil, but has some problems, such as complex preparation method, easy secondary harm caused by environment in the use process, unfavorable stability of heavy metal in the soil, and the like, and the application range is limited.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the soil curing agent with the heavy metal stabilizing effect is stable and reliable in performance, non-toxic and harmless, free of pollution to the environment, capable of integrating adsorption, coating, chelation, coordination, crystallization and mineralization, and capable of greatly improving the water resistance and the pressure resistance of the soil after the soil is cured and effectively stabilizing the heavy metals in the soil; the invention also provides a preparation method and application thereof.
The soil stabilizer with the heavy metal stabilizing effect comprises the following raw materials in parts by weight:
preferably, the soil stabilizer with the heavy metal stabilizing effect comprises the following raw materials in parts by weight:
preferably, the pH buffering agent is sodium dihydrogen phosphate.
Preferably, the iron salt is ferric sulfate or ferric phosphate.
The preparation method of the soil stabilizer with the heavy metal stabilizing effect comprises the following steps:
dissolving sodium carboxymethylcellulose, sodium polycarboxylate, calcium lignosulfonate and lithium hydroxide in water, and adding a pH buffering agent after fully dissolving; and then adding iron salt and heavy metal chelating agent, mixing and stirring to obtain a soil solidifying agent product.
Preferably, a pH buffer is added to adjust the pH of the solution to between 6 and 8.
The soil curing agent with the heavy metal stabilizing effect is applied to the mixture of soil and cement, and the soil curing agent is added, uniformly mixed and compacted to realize the soil curing.
Preferably, the addition amount of the soil stabilizer is 0.015-0.025% of the total mass of the mixture of soil and cement.
The soil curing agent can disperse large soil aggregates into a fine agglomerate structure, and then the particles with positive charges and the soil particles with negative charges act to reduce the electrification property and the repulsive force among the aggregates greatly. When calcium and magnesium ions and cement are added into soil, low-price particles in the curing agent are exchanged with Ca and Mg particles, so that the calcium and magnesium ions are more uniformly distributed, and chemical reaction is generated by taking the calcium and magnesium ions as a center to generate chemical bonds to form a firm network structure in the soil. Part of the crystal water originally existing between molecules is used as a reactant to become adsorbed water on the surface of the soil aggregate, and part of the original adsorbed water is replaced. The water content in unit volume is reduced, so that the dry density of the soil can be increased, the compactness is improved, and the purpose of improving the compressive strength of the solidified soil is achieved.
After the soil solidifying agent is mixed with the soil containing a certain amount of water, the colloid is ionized to lose surface positivity, and a series of physical and chemical reactions occur, the high-valence ions in the solution can change the characteristics of the surface charges of soil particles, reduce the repulsive force among the soil particles, destroy the adsorption force among the soil particles, and make the soil particles unable to absorb more water.
Meanwhile, sodium carboxymethylcellulose is rich in a plurality of adsorptive groups such as hydroxyl, carboxyl and the like, and can generate salt substances such as sodium salt, copper salt, zinc salt and the like through coordination with heavy metal ions; the combined action of the heavy metal chelating agent and the ferric salt is combined, the detoxification of the hazardous waste is realized, the toxic and harmful pollutants in the solid are converted into three-low (low solubility, low mobility and low hazard) substances, and the landfill condition is achieved.
Compared with the prior art, the invention has the following beneficial effects:
(1) The soil curing agent is a novel high-molecular environment-friendly material, and is characterized by being non-toxic, harmless, nonflammable, non-explosive, easy to store, convenient to transport, simple in construction process, cost-saving, shortened in construction period, and suitable for various soils and industrial solid wastes (construction wastes, various tailing residues and the like);
(2) The invention adopts the soil curing agent to replace a large amount of lime, cement, fly ash, broken stones, gravels and other traditional road building materials, saves resources and energy, saves land, protects vegetation, greatly reduces the emission of greenhouse gases such as carbon dioxide and the like, is beneficial to ecological environment protection, and has particularly obvious economic and environmental benefits.
(3) The soil stabilizer can obviously improve the performance of the roadbed, the unconfined compressive strength of the solidified roadbed can be improved by 40-100%, and the solidified roadbed has good water stability, freezing stability, heavy metal stability and wide application range.
Detailed Description
The present invention is further illustrated by the following examples, but the scope of the present invention is not limited thereto, and modifications of the technical solutions of the present invention by those skilled in the art should be within the scope of the present invention.
The starting materials used in the examples are, unless otherwise specified, commercially available conventional starting materials; the processes used in the examples are, unless otherwise specified, conventional in the art.
Example 1
Preparing a soil stabilizer from the following raw materials in parts by weight:
15 parts of sodium carboxymethylcellulose, 15 parts of sodium polycarboxylate, 10 parts of calcium lignosulfonate, 20 parts of lithium hydroxide, 6 parts of sodium dihydrogen phosphate, 20 parts of ferric sulfate, 5 parts of heavy metal chelating agent and 100 parts of water.
The preparation method comprises the following steps:
dissolving sodium carboxymethylcellulose, sodium polycarboxylate, calcium lignosulphonate and lithium hydroxide in water, fully dissolving, and adding sodium dihydrogen phosphate to adjust the pH value of the solution to 6-8; and then adding ferric sulfate and a heavy metal chelating agent, mixing and stirring to obtain a soil curing agent product.
Example 2
Preparing a soil stabilizer from the following raw materials in parts by weight:
20 parts of sodium carboxymethylcellulose, 10 parts of sodium polycarboxylate, 12 parts of calcium lignosulfonate, 25 parts of lithium hydroxide, 10 parts of sodium dihydrogen phosphate, 15 parts of iron phosphate, 3 parts of heavy metal chelating agent and 100 parts of water.
The preparation method comprises the following steps:
dissolving sodium carboxymethylcellulose, sodium polycarboxylate, calcium lignosulphonate and lithium hydroxide in water, fully dissolving, and adding sodium dihydrogen phosphate to adjust the pH value of the solution to 6-8; and then adding iron phosphate and a heavy metal chelating agent, and mixing and stirring to obtain a soil stabilizer product.
Example 3
The soil stabilizer is prepared from the following raw materials in parts by weight:
10 parts of sodium carboxymethylcellulose, 20 parts of sodium polycarboxylate, 15 parts of calcium lignosulfonate, 15 parts of lithium hydroxide, 3 parts of sodium dihydrogen phosphate, 25 parts of ferric sulfate, 6 parts of heavy metal chelating agent and 100 parts of water.
The preparation method comprises the following steps:
dissolving sodium carboxymethylcellulose, sodium polycarboxylate, calcium lignosulphonate and lithium hydroxide in water, fully dissolving, and adding sodium dihydrogen phosphate to adjust the pH value of the solution to 6-8; and then adding ferric sulfate and a heavy metal chelating agent, mixing and stirring to obtain a soil stabilizer product.
The soil curing agent prepared in the example 1 is used for soil curing, and is added into a mixture of soil and cement, uniformly mixed and compacted; wherein the addition amount of the soil curing agent is 0.015-0.025% of the total mass of the mixture of soil and cement.
The unconfined compressive strength (CJ/T486-2015) test results for example 1 at different blending ratios and different ages are shown in Table 1.
TABLE 1
As can be seen from Table 1, the unconfined compressive strength of the soil stabilizer is obviously superior to that of cement stabilized soil with the same dosage, and the soil stabilizer of the invention has the best dosage of 0.02-0.025 percent, and the strength is continuously improved along with the increase of age.
The results of the flexural tensile (cleavage) strength test (CJ/T486-2015) for example 1 at different blend ratios and different ages are shown in Table 2.
TABLE 2
As can be seen from Table 2, the soil stabilizer solidified and stabilized soil has good bending and tensile properties, the splitting strength reaches 0.51-0.72 MPa, and the splitting strength approaches or exceeds the current standard of cement stabilizing gravel.
The results of the water stability test (CJ/T486-2015) for example 1 at various ages are shown in Table 3.
TABLE 3
As can be seen from Table 3, the soil stabilizer of the present invention can greatly improve water stability. Meanwhile, the water stability coefficient gradually increases with the increase of the age of the test piece.
The test results of the compression resilience modulus test (CJ/T486-2015) of example 1 at different mixing ratios and different ages are shown in Table 4.
TABLE 4
As can be seen from Table 4, the compression resistant resilience modulus value of the soil stabilizer solidified and stabilized soil reaches 1410-1756 MPa, and the national current standard is met.
The results of the freeze-thaw test (CJ/T486-2015) test of example 1 at various blending ratios and different ages are shown in Table 5.
TABLE 5
As can be seen from Table 5, the soil stabilizer of the present invention is significantly superior in freezing resistance to lime soil and lime soil. Lime soil and lime soil are common pavement base materials in seasonally frozen regions and have been proven to meet the requirements of seasonally freezing. Through engineering practical application, the TX solidification stable pavement base material is proved to completely meet the engineering application in seasonal freezing areas.
Claims (8)
1. A soil stabilizer with heavy metal stabilization, which is characterized in that: the composite material comprises the following raw materials in parts by weight:
2. the soil stabilizer with heavy metal stabilization according to claim 1, wherein: the feed comprises the following raw materials in parts by weight:
3. the soil stabilizer with heavy metal stabilization according to claim 1 or 2, wherein: the pH buffering agent is sodium dihydrogen phosphate.
4. The soil stabilizer with heavy metal stabilization according to claim 1 or 2, wherein: the iron salt is ferric sulfate or ferric phosphate.
5. A method for preparing a soil stabilizer having a heavy metal stabilizing effect according to claim 1 or 2, comprising: the method comprises the following steps:
dissolving sodium carboxymethylcellulose, sodium polycarboxylate, calcium lignosulfonate and lithium hydroxide in water, and adding a pH buffering agent after fully dissolving; then adding iron salt and heavy metal chelating agent, mixing and stirring to obtain the soil stabilizer product.
6. The method for preparing a soil stabilizer with heavy metal stabilization according to claim 5, wherein: adding pH buffer to adjust the pH value of the solution to 6-8.
7. Use of the soil stabilizer for heavy metals according to claim 1 or 2, wherein: and adding a soil curing agent into the mixture of the soil and the cement, uniformly mixing and compacting to realize the solidification of the soil.
8. Use of a soil stabilizer with heavy metal stabilization according to claim 7, wherein: the addition amount of the soil curing agent is 0.015-0.025% of the total mass of the mixture of the soil and the cement.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210829202.1A CN115197709A (en) | 2022-06-27 | 2022-06-27 | Soil stabilizer with heavy metal stabilizing effect and preparation method and application thereof |
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| CN202210829202.1A CN115197709A (en) | 2022-06-27 | 2022-06-27 | Soil stabilizer with heavy metal stabilizing effect and preparation method and application thereof |
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2022
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