CN112830649B - Curing agent for water conservancy river sludge treatment and preparation method thereof - Google Patents
Curing agent for water conservancy river sludge treatment and preparation method thereof Download PDFInfo
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- CN112830649B CN112830649B CN202110081486.6A CN202110081486A CN112830649B CN 112830649 B CN112830649 B CN 112830649B CN 202110081486 A CN202110081486 A CN 202110081486A CN 112830649 B CN112830649 B CN 112830649B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/008—Sludge treatment by fixation or solidification
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention provides a water conservancy river sludge treatment curing agent and a preparation method thereof. The curing agent comprises the following components in parts by weight: 20-50 parts of silicate, 20-30 parts of calcium aluminum hydrotalcite, 20-30 parts of montmorillonite, 8-15 parts of polyacrylonitrile copolymer fiber, 3-8 parts of polyacrylamide and 1-3 parts of triethanolamine. According to the invention, the anionic layered double hydroxide calcium aluminum hydrotalcite, the cationic layered silicate sheet layer and the anionic polyacrylonitrile copolymer fiber are added into the curing agent, so that the adsorption and consolidation of heavy metal ions in the sludge are improved by utilizing the strong adsorption of two ionic layered compounds, the adsorption and enhancement of the polyacrylonitrile copolymer fiber are utilized, the curing strength is further improved, and the curing effect on the sludge is finally obviously improved.
Description
Technical Field
The invention relates to the technical field of soil treatment chemicals, in particular to a water conservancy river sludge treatment curing agent and a preparation method thereof.
Background
Along with the development of the whole-time economy and the increase of activities for improving the earth geographical environment, the dredging operation of coastal and inland rivers and lakes and the dredging work of urban water channels are more and more. The dredging project necessarily involves the problem of sludge environmental protection treatment, so how to treat and utilize the sludge, find a way for resource utilization of the sludge, reduce new pollution, and become a sustainable development problem related to ecological restoration, resource recycling and environmental protection.
The basic principle of sludge solidification is as follows: and adding a curing agent material into the sludge, and stirring and mixing to prepare sludge cured soil. The silt is hydrated by the curing agent and water, and most of silt is soil particles with the particle size of less than 0.005mm, and the silt is combined with water to form a colloid dispersion system, shows a colloid characteristic, and can be hydrated with the curing agent to generate calcium hydroxide Ca (OH) 2 Ca in (1) 2+ The equivalent adsorption and exchange are carried out, so that a diffusion layer formed by calcium ions adsorbed on the surface of soil particles is thinned, and a large amount of smaller soil particles form larger aggregates, thereby improving the strength of the soil body. Through sludge solidification treatment, wastes such as coal cinder, fly ash, blast furnace slag, silt and the like are recycled to be solidified soil aggregate, so that the compressive strength of the solidified soil is increased, and the problem of waste outtake is solved. And harmful substances such as organic matters, heavy metals and the like contained in the sludge can be sealed and consolidated in the sludge, and the solidified sludge has low water permeability, so that the harmful substances are difficult to dissolve out again to form secondary pollution.
The silt curing agent can be classified into a high-molecular curing agent, a biological curing agent, a chemical curing agent and the like. According to the national conditions, a compound curing agent is mostly adopted, and the curing agent has low cost and convenient material acquisition. After the composite curing agent and the sludge are fully mixed and stirred, the properties of high water content and low strength of the sludge are improved by utilizing a series of complex physical and chemical changes between the sludge and a curing material, so that the sludge is converted into a soil material for use. Meanwhile, a plurality of industrial wastes with certain activity can be used as curing materials, such as waste gypsum, fly ash and the like, so that the curing treatment cost is greatly reduced. Patent CN200910157515.1 discloses a silt and sludge curing agent, which is composed of 95% of main materials with cementing function and 5% of auxiliary materials with catalytic function. The main materials mainly comprise coal gangue, bentonite, wollastonite, volcanic ash soil and the like, and the auxiliary materials mainly comprise polyacrylamide, triethanolamine, quartz powder, ferric oxide, copper oxide and the like. The sludge is high in initial setting speed, and the compressive strength reaches 0.8-5 MPa. However, the curing agent has complex composition, long complete curing time and poor consolidation effect on heavy metals.
In view of the above, there is a need to design an improved curing agent for water conservancy river sludge treatment and a preparation method thereof to solve the above problems.
Disclosure of Invention
The invention aims to provide a water conservancy river sludge treatment curing agent and a preparation method thereof. By adding anionic layered double hydroxide calcium aluminum hydrotalcite, cationic layered silicate sheet and anionic polyacrylonitrile copolymer fiber into the curing agent, the curing effect on sludge is obviously improved, and the curing strength is obviously improved.
In order to realize the aim, the invention provides a water conservancy river sludge treatment curing agent which comprises the following components in parts by weight: 20-50 parts of silicate, 20-30 parts of calcium-aluminum hydrotalcite, 20-30 parts of montmorillonite, 8-15 parts of polyacrylonitrile copolymer fiber, 3-8 parts of polyacrylamide and 1-3 parts of triethanolamine.
As a further improvement of the invention, the silicate comprises sodium silicate, calcium silicate and magnesium fluorosilicate.
According to a further improvement of the invention, the weight ratio of the sodium silicate to the calcium silicate to the magnesium fluosilicate is 1: 0.5-1: 0.2-0.5.
As a further improvement of the invention, the polyacrylonitrile copolymer fiber is a copolymer fiber of acrylonitrile, methyl acrylate and sodium propylene sulfonate.
As a further improvement of the invention, the mass content of the sodium propylene sulfonate in the polyacrylonitrile copolymer fiber is 4 wt% -10 wt%.
As a further improvement of the invention, the diameter of the polyacrylonitrile copolymer fiber is 0.5-5 μm.
As a further improvement of the invention, the calcium-aluminum hydrotalcite is Ca-Al nitrate type hydrotalcite, and the montmorillonite is sodium-based montmorillonite.
As a further improvement of the invention, the calcium-aluminum hydrotalcite and the montmorillonite are compounded by the following method: and respectively stripping the calcium-aluminum hydrotalcite and the montmorillonite, and then carrying out layer-by-layer self-assembly on a cation sheet layer of the calcium-aluminum hydrotalcite and an anion sheet layer of the montmorillonite to obtain the compound of the calcium-aluminum hydrotalcite and the montmorillonite.
The invention also provides a preparation method of the water conservancy river sludge treatment curing agent, which comprises the following steps:
s1, respectively stripping calcium-aluminum hydrotalcite and montmorillonite, and then carrying out layer-by-layer self-assembly on a cation sheet layer of the calcium-aluminum hydrotalcite and an anion sheet layer of the montmorillonite to obtain a compound of the calcium-aluminum hydrotalcite and the montmorillonite;
s2, cutting the polyacrylonitrile copolymer fiber into fibers with the length of 1-10 cm;
and S3, uniformly mixing the compound of the calcium-aluminum hydrotalcite and the montmorillonite with polyacrylonitrile copolymer fiber and polyacrylamide with the length of 1-10 cm, then adding the silicate, uniformly mixing, adding the triethanolamine, and uniformly mixing to obtain the water conservancy river sludge treatment curing agent.
As a further improvement of the invention, when the water conservancy river sludge treatment curing agent is used, the mass of the curing agent is 5-10 wt% of the sludge, and the water content of the sludge is controlled to be 25-35 wt%.
The invention has the beneficial effects that:
1. according to the water conservancy river sludge treatment curing agent provided by the invention, the anionic layered double hydroxide calcium aluminum hydrotalcite, the cationic layered silicate sheet layer and the anionic polyacrylonitrile copolymer fiber are added into the curing agent, the adsorption and consolidation of heavy metal ions in sludge are improved by utilizing the strong adsorption property of two ionic layered compounds, the adsorption and enhancement effect of the polyacrylonitrile copolymer fiber are utilized, the curing strength is further improved, and the curing effect on sludge is finally obviously improved. Moreover, the addition of a plurality of ionic components in the curing agent is beneficial to generating electrostatic adsorption, thereby improving the curing speed of the sludge.
2. The water conservancy river sludge treatment curing agent provided by the invention adopts polyacrylonitrile-methyl acrylate-sodium propylene sulfonate copolymer fiber, wherein a sodium propylene sulfonate chain segment in the polyacrylonitrile copolymer fiber is a polyanionic chain segment, and polyacrylonitrile and a methyl acrylate chain segment also have strong polarity, and can perform electrostatic adsorption or hydrogen bond action with sludge and hydroxyl-containing components in the curing agent, so that the curing rate and strength of the sludge are improved. And the nano-grade fiber is added in a fiber form, has high specific surface area and better adsorbability.
3. The water conservancy river sludge treatment curing agent provided by the invention utilizes the layered structure and the strippability of calcium-aluminum hydrotalcite and montmorillonite to respectively obtain a metal cation lamella and a silicate anion lamella, and then utilizes electrostatic adsorption to self-assemble the two lamellas layer by layer to obtain a calcium-aluminum hydrotalcite and montmorillonite composite with good adsorbability. The surface of the compound is rich in a large amount of hydroxyl, and the compound can be solidified with inorganic matters in the sludge and complexed with heavy metal ions, so that the heavy metal is firmly solidified and solidified.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail below with reference to specific embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme of the present invention are shown in the specific embodiments, and other details not closely related to the present invention are omitted.
In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a water conservancy river sludge treatment curing agent which comprises the following components in parts by weight: 20-50 parts of silicate, 20-30 parts of calcium-aluminum hydrotalcite, 20-30 parts of montmorillonite, 8-15 parts of polyacrylonitrile copolymer fiber, 3-8 parts of polyacrylamide and 1-3 parts of triethanolamine.
Preferably, the curing agent comprises the following components in parts by weight: 30-40 parts of silicate, 20-28 parts of calcium aluminum hydrotalcite, 20-28 parts of montmorillonite, 8-12 parts of polyacrylonitrile copolymer fiber, 3-6 parts of polyacrylamide and 1-2 parts of triethanolamine.
More preferably, the curing agent comprises the following components in parts by weight: 32-35 parts of silicate, 22-25 parts of calcium-aluminum hydrotalcite, 22-25 parts of montmorillonite, 8-10 parts of polyacrylonitrile copolymer fiber, 3-5 parts of polyacrylamide and 1.5 parts of triethanolamine.
According to the invention, the anionic layered double hydroxide calcium aluminum hydrotalcite, the cationic layered silicate sheet layer and the anionic polyacrylonitrile copolymer fiber are added into the curing agent, so that the adsorption and consolidation of heavy metal ions in the sludge are improved by utilizing the strong adsorption of two ionic layered compounds, the adsorption and enhancement of the polyacrylonitrile copolymer fiber are utilized, the curing strength is further improved, and the curing effect on the sludge is finally obviously improved. Moreover, the addition of a plurality of ionic components in the curing agent is beneficial to generating electrostatic adsorption, thereby improving the curing speed of the sludge.
Wherein the silicate comprises sodium silicate, calcium silicate and magnesium fluosilicate. The weight ratio of the sodium silicate to the calcium silicate to the magnesium fluosilicate is 1: 0.5-1: 0.2-0.5, preferably 1: 0.5-0.8: 0.2-0.4, and more preferably 1: 0.5-0.6: 0.2-0.3.
The polyacrylonitrile copolymer fiber is copolymer fiber of acrylonitrile, methyl acrylate and sodium propylene sulfonate. The diameter of the polyacrylonitrile copolymer fiber is 0.5-5 μm.
The mass content of sodium propylene sulfonate in the polyacrylonitrile copolymer fiber is 4 wt% -10 wt%, preferably 4 wt% -8 wt%, and more preferably 5 wt% -7 wt%. The sodium propylene sulfonate chain segment in the polyacrylonitrile copolymer fiber is a polyanion chain segment, and the polyacrylonitrile and methyl acrylate chain segments also have strong polarity and can generate electrostatic adsorption or hydrogen bond action with the sludge and hydroxyl-containing components in the curing agent, so that the curing speed and strength of the sludge are improved. And the nano-grade fiber is added in a fiber form, has high specific surface area and better adsorbability.
More preferably, the polyacrylonitrile copolymer fiber is porous polyacrylonitrile copolymer fiber, so that the specific surface area of the fiber is increased, the adsorbability of the fiber is improved, and the adsorption and consolidation of organic matters and heavy metals in sludge are facilitated. The preparation method of the porous polyacrylonitrile copolymer fiber comprises the following steps: melting, blending and extruding polyacrylonitrile-methyl acrylate-sodium propylene sulfonate copolymer and cellulose acetate butyrate by a mass ratio of 80% to 20% -98% to 2%, and then extracting and separating the cellulose acetate butyrate by using acetone to obtain the porous polyacrylonitrile copolymer fiber.
The calcium-aluminum hydrotalcite is Ca-Al nitrate type hydrotalcite, and the montmorillonite is sodium-based montmorillonite.
The preparation method of the calcium-aluminum hydrotalcite comprises the following steps: respectively preparing Ca (NO) with the concentration of 1-3 mol/L 3 ) 2 And Al (NO) with a concentration of 0.5 to 1.5mol/L 3 ) 2 In terms of molar ratio Ca 2+ /Al 3+ ＝3/1，Ca 2+ +Al 3+ Mixing the components in a ratio of 0.5-2 mol/L; preparing NaOH with the concentration of 1-3 mol/L, slowly adding the NaOH into the calcium-aluminum mixed solution while stirring, controlling the pH value of the solution to be about 9.0, reacting for 6-8h at 60 ℃, and then performing suction filtration, washing, drying and grinding to obtain the calcium-aluminum hydrotalcite.
The calcium-aluminum hydrotalcite and the montmorillonite are compounded by the following method: respectively stripping the calcium-aluminum hydrotalcite and the montmorilloniteAnd then carrying out layer-by-layer self-assembly on the cation sheet layer of the calcium-aluminum hydrotalcite and the anion sheet layer of the montmorillonite to obtain the compound of the calcium-aluminum hydrotalcite and the montmorillonite. Respectively obtaining metal cation sheet layers (Ca) by utilizing the layered structure and the strippability of the calcium-aluminum hydrotalcite and the montmorillonite 2+ 、Al 3+ ) And silicate anion lamella, and then self-assembling the two lamella layers layer by utilizing electrostatic adsorption to obtain the compound of calcium-aluminum hydrotalcite and montmorillonite with good adsorbability. The surface of the compound is rich in a large amount of hydroxyl, and the compound can be solidified with inorganic matters in the sludge and complexed with heavy metal ions, so that the heavy metal is firmly solidified and solidified.
Wherein, the stripping of the calcium-aluminum hydrotalcite can be realized in the preparation process, namely the calcium-aluminum hydrotalcite with stripped intercalation is directly prepared. For example, in the above preparation process, an anionic intercalation agent (such as sodium dodecyl sulfate) is added into the calcium-aluminum mixed solution. The montmorillonite is exfoliated by cationic intercalating agent such as cetyl trimethyl ammonium bromide.
The invention also provides a preparation method of the water conservancy river sludge treatment curing agent, which comprises the following steps:
s1, respectively stripping calcium-aluminum hydrotalcite and montmorillonite, and then carrying out layer-by-layer self-assembly on a cation sheet layer of the calcium-aluminum hydrotalcite and an anion sheet layer of the montmorillonite to obtain a compound of the calcium-aluminum hydrotalcite and the montmorillonite;
s2, cutting the polyacrylonitrile copolymer fiber into fibers with the length of 1-10 cm;
and S3, uniformly mixing the compound of the calcium-aluminum hydrotalcite and the montmorillonite with polyacrylonitrile copolymer fiber and polyacrylamide with the length of 1-10 cm, then adding the silicate, uniformly mixing, adding the triethanolamine, and uniformly mixing to obtain the water conservancy river sludge treatment curing agent.
When the water conservancy river sludge treatment curing agent is used, the mass of the curing agent is 5-10 wt% of sludge, and the water content of the sludge is controlled to be 25-35 wt%. The curing agent disclosed by the invention is small in use amount and high in curing strength.
Example 1
A water conservancy river sludge treatment curing agent comprises the following components in parts by weight: 35 parts of silicate (sodium silicate, calcium silicate and magnesium fluosilicate with the weight ratio of 1:0.6: 0.4), 25 parts of calcium-aluminum hydrotalcite, 25 parts of montmorillonite, 12 parts of polyacrylonitrile copolymer fiber, 6 parts of polyacrylamide and 2 parts of triethanolamine.
The preparation method comprises the following steps:
s1, respectively stripping calcium-aluminum hydrotalcite and montmorillonite (sodium dodecyl sulfate and hexadecyl trimethyl ammonium bromide are respectively adopted for stripping, and the addition amount of a stripping agent is 10% of the mass of the calcium-aluminum hydrotalcite and the montmorillonite respectively), and then carrying out layer-by-layer self-assembly on a cation sheet layer of the calcium-aluminum hydrotalcite and an anion sheet layer of the montmorillonite to obtain a compound of the calcium-aluminum hydrotalcite and the montmorillonite;
the preparation method of the peeled calcium-aluminum hydrotalcite comprises the following steps: ca (NO) with the concentration of 2mol/L is prepared respectively 3 ) 2 And Al (NO) at a concentration of 1mol/L 3 ) 2 In terms of molar ratio Ca 2+ /Al 3+ ＝3/1，Ca 2+ +Al 3+ Mixing at the ratio of 1 mol/L; then NO is added 3 - Sodium dodecyl sulfate 30% of the amount of substance; preparing NaOH with the concentration of 1-3 mol/L, slowly adding the NaOH into the calcium-aluminum mixed solution while stirring, controlling the pH value of the solution to be about 9.0, reacting for 6-8h at 60 ℃, and then performing suction filtration, washing, drying and grinding to obtain the peeled calcium-aluminum hydrotalcite.
The preparation method of the peeled montmorillonite comprises the following steps: adding montmorillonite into deionized water, stirring to obtain suspension, adding ethanol and water mixed solution of cetyl trimethyl ammonium bromide (the mass of the cetyl trimethyl ammonium bromide is 10% of that of the montmorillonite), adjusting pH to about 6, reacting at 60 deg.C for 6-8h, suction filtering, washing, drying, and grinding to obtain peeled montmorillonite.
S2, cutting polyacrylonitrile-methyl acrylate-sodium propylene sulfonate copolymer fibers (the mass content of sodium propylene sulfonate is 8 wt%) with the diameter of 2 mu m into fibers with the length of 8-10 cm;
and S3, uniformly mixing the compound of the calcium-aluminum hydrotalcite and the montmorillonite with polyacrylonitrile copolymer fiber and polyacrylamide with the length of 1-10 cm, then adding the silicate, uniformly mixing, adding the triethanolamine, and uniformly mixing to obtain the water conservancy river sludge treatment curing agent.
The curing agent prepared in the embodiment is used for treating the sludge, the mass of the curing agent is 8 wt% of the sludge, and the water content of the sludge is 30 wt%.
The test result shows that the initial setting time is about 4h, the strength reaches 1.2MPa after curing treatment for 3 days, and the strength reaches 3.1MPa after curing treatment for 6 days. It can be seen that the sludge solidification speed and the solidification strength are both superior. According to the invention, by adding the polyacrylonitrile-methyl acrylate-sodium propylene sulfonate copolymer fiber, the polyanion characteristic of the sodium polypropylene sulfonate chain segment and the strong polarity of the polyacrylonitrile and methyl acrylate chain segments are utilized, and the electrostatic adsorption or hydrogen bond action can be generated between the polyacrylonitrile-methyl acrylate-sodium propylene sulfonate copolymer fiber and the hydroxyl-containing components in the sludge and the curing agent, so that the curing rate and strength of the sludge are improved. And the nano-level fiber is added in a fiber form, has high specific surface area and better adsorbability.
Examples 2 to 3
Compared with the example 1, the water conservancy river sludge treatment curing agent is different in that the mass content of sodium propylene sulfonate in polyacrylonitrile-methyl acrylate-sodium propylene sulfonate copolymer fiber is shown in the table 1. The rest is substantially the same as that of embodiment 1, and will not be described herein.
TABLE 1 preparation conditions and test results for examples 2-3
As can be seen from table 1, when the mass content of sodium allylsulfonate in the polyacrylonitrile-methyl acrylate-sodium allylsulfonate copolymerized fiber is decreased, the sludge curing strength is decreased. The polyanionic chain segment sodium allylsulfonate is added, which is beneficial to the electrostatic adsorption or hydrogen bond action with the sludge and the hydroxyl-containing component in the curing agent, thereby improving the curing speed and strength of the sludge.
Example 4
Compared with the embodiment 1, the water conservancy river sludge treatment curing agent is different in that the calcium-aluminum hydrotalcite and the montmorillonite are not compounded by self-assembly layer by layer. The rest is substantially the same as that of embodiment 1, and will not be described herein.
The test result shows that the initial setting time is about 5h, the strength reaches 1.05MPa after curing treatment for 3 days, and the strength reaches 2.8MPa after curing treatment for 6 days. The consolidation effect is better after the calcium-aluminum hydrotalcite is compounded with the montmorillonite.
Example 5
Compared with the embodiment 1, the water conservancy river sludge treatment curing agent is characterized in that the polyacrylonitrile copolymer fiber is porous polyacrylonitrile-methyl acrylate-sodium propylene sulfonate copolymer fiber. Melting and blending polyacrylonitrile-methyl acrylate-sodium propylene sulfonate copolymer and cellulose acetate butyrate according to the mass ratio of 90% to 10% to extrude spinning, and then extracting and separating the cellulose acetate butyrate by using acetone to obtain the porous polyacrylonitrile copolymer fiber. The rest is substantially the same as that of embodiment 1, and will not be described herein.
The test result shows that the initial setting time is about 4h, the strength reaches 1.3MPa after curing treatment for 3 days, and the strength reaches 3.5MPa after curing treatment for 6 days. The porous structure of the fiber is helpful to improve the specific surface area of the fiber, so as to improve the adsorbability of the fiber, and further improve the adsorption and consolidation effects on organic matters and heavy metals in the sludge.
Example 6
Compared with the embodiment 1, the water conservancy river sludge treatment curing agent is characterized by comprising the following components in parts by weight: 30-40 parts of silicate, 20-28 parts of calcium-aluminum hydrotalcite, 20-28 parts of montmorillonite, 8-12 parts of polyacrylonitrile copolymer fiber, 3-6 parts of polyacrylamide and 1-2 parts of triethanolamine. The rest is substantially the same as that of embodiment 1, and will not be described herein.
Example 7
Compared with the embodiment 1, the water conservancy river sludge treatment curing agent is characterized by comprising the following components in parts by weight: 32-35 parts of silicate, 22-25 parts of calcium-aluminum hydrotalcite, 22-25 parts of montmorillonite, 8-10 parts of polyacrylonitrile copolymer fiber, 3-5 parts of polyacrylamide and 1.5 parts of triethanolamine. The rest is substantially the same as that of embodiment 1, and will not be described herein.
Example 8
Compared with the example 1, the water conservancy river sludge treatment curing agent is characterized in that the weight ratio of sodium silicate, calcium silicate and magnesium fluosilicate in silicate is 1:0.5: 0.4. The rest is substantially the same as that of embodiment 1, and will not be described herein.
Example 9
Compared with the example 1, the water conservancy river sludge treatment curing agent is characterized in that the weight ratio of sodium silicate, calcium silicate and magnesium fluosilicate in silicate is 1:0.8: 0.4. The rest is substantially the same as embodiment 1, and will not be described herein.
Example 10
Compared with the example 1, the water conservancy river sludge treatment curing agent is characterized in that the weight ratio of sodium silicate, calcium silicate and magnesium fluosilicate in silicate is 1:1: 0.4. The rest is substantially the same as that of embodiment 1, and will not be described herein.
Example 11
Compared with the example 1, the water conservancy river sludge treatment curing agent is characterized in that the weight ratio of sodium silicate, calcium silicate and magnesium fluosilicate in silicate is 1:0.6: 0.5. The rest is substantially the same as embodiment 1, and will not be described herein.
TABLE 2 preparation conditions and test results for examples 6-11
| Test examples | Curing treatment 3 days Strength (MPa) | Cured for 6 days Strength (MPa) |
| Example 6 | 1.0 | 2.9 |
| Example 7 | 1.2 | 3.0 |
| Example 8 | 1.0 | 2.9 |
| Example 9 | 1.2 | 3.2 |
| Example 10 | 1.1 | 2.9 |
| Example 11 | 1.0 | 2.9 |
As can be seen from Table 2, the sludge has a high curing speed and a high curing strength within the curing agent formulation range defined in the present invention. Among them, in the preferable formulation range, the curing speed and the curing strength are more excellent. The method shows that the addition amounts of the calcium-aluminum hydrotalcite, the montmorillonite and the polyacrylonitrile copolymer fiber have important influence on the curing effect of the sludge. According to the invention, the three components are added, and the content of the three components is reasonably regulated, so that the curing speed and the curing strength of the sludge can be obviously improved. The weight ratio of sodium silicate, calcium silicate and magnesium fluosilicate in the silicate also has certain influence on the curing speed and the curing strength. When the calcium silicate content is too low, the curing strength is not improved.
Comparative example 2
Compared with the embodiment 1, the water conservancy river sludge treatment curing agent is different in that montmorillonite is not added in the curing agent. The rest is substantially the same as that of embodiment 1, and will not be described herein.
Comparative example 3
Compared with the example 1, the difference of the curing agent for treating the water conservancy river sludge is that calcium-aluminum hydrotalcite is not added in the curing agent. The rest is substantially the same as that of embodiment 1, and will not be described herein.
Comparative example 4
Compared with the example 1, the water conservancy river sludge treatment curing agent is different in that polyacrylonitrile copolymer fiber is not added in the curing agent. The rest is substantially the same as that of embodiment 1, and will not be described herein.
Table 3 preparation conditions and test results of example 1 and comparative examples 2 to 4
| Test examples | Curing treatment 3 days Strength (MPa) | Cured for 6 days Strength (MPa) |
| Example 1 | 1.2 | 3.1 |
| Comparative example 2 | 0.8 | 2.3 |
| Comparative example 3 | 0.6 | 2.0 |
| Comparative example 4 | 0.9 | 2.5 |
It can be seen from table 3 that the curing strength was reduced to various degrees when none of the calcium aluminum hydrotalcite, montmorillonite or polyacrylonitrile copolymer fibers was added. The invention shows that by adding anionic layered double hydroxide calcium aluminum hydrotalcite, cationic layered silicate sheet layer and anionic polyacrylonitrile copolymer fiber into the curing agent, the strong adsorbability of two ionic layered compounds is utilized to improve the adsorption and consolidation of heavy metal ions in the sludge, the adsorbability and the reinforcement effect of the polyacrylonitrile copolymer fiber are utilized to further improve the curing strength, and finally the curing effect on the sludge is obviously improved.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (8)
1. The water conservancy river sludge treatment curing agent is characterized by comprising the following components in parts by weight: 20-50 parts of silicate, 20-30 parts of calcium-aluminum hydrotalcite, 20-30 parts of montmorillonite, 8-15 parts of polyacrylonitrile copolymer fiber, 3-8 parts of polyacrylamide and 1-3 parts of triethanolamine; the calcium-aluminum hydrotalcite and the montmorillonite are compounded by the following method: respectively stripping the calcium-aluminum hydrotalcite and the montmorillonite, and then carrying out layer-by-layer self-assembly on a cation sheet layer of the calcium-aluminum hydrotalcite and an anion sheet layer of the montmorillonite to obtain a compound of the calcium-aluminum hydrotalcite and the montmorillonite; the polyacrylonitrile copolymer fiber is copolymer fiber of acrylonitrile, methyl acrylate and sodium propylene sulfonate.
2. The water conservancy river sludge treatment curing agent according to claim 1, wherein the silicate comprises sodium silicate, calcium silicate and magnesium fluorosilicate.
3. The curing agent for water conservancy river sludge treatment according to claim 2, wherein the weight ratio of the sodium silicate to the calcium silicate to the magnesium fluosilicate is 1: 0.5-1: 0.2-0.5.
4. The curing agent for water conservancy river sludge treatment according to claim 1, wherein the mass content of sodium propylene sulfonate in the polyacrylonitrile copolymer fiber is 4 wt% to 10 wt%.
5. The curing agent for water conservancy river sludge treatment according to claim 4, wherein the polyacrylonitrile copolymer fiber has a diameter of 0.5-5 μm.
6. The curing agent for water conservancy river sludge treatment according to claim 1, wherein the calcium-aluminum hydrotalcite is Ca-Al nitrate type hydrotalcite, and the montmorillonite is sodium-based montmorillonite.
7. The preparation method of the water conservancy river sludge treatment curing agent as claimed in any one of claims 1 to 6, which is characterized by comprising the following steps:
s1, respectively stripping calcium-aluminum hydrotalcite and montmorillonite, and then carrying out layer-by-layer self-assembly on a cation sheet layer of the calcium-aluminum hydrotalcite and an anion sheet layer of the montmorillonite to obtain a compound of the calcium-aluminum hydrotalcite and the montmorillonite;
s2, cutting the polyacrylonitrile copolymer fiber into fibers with the length of 1-10 cm;
and S3, uniformly mixing the compound of the calcium-aluminum hydrotalcite and the montmorillonite with polyacrylonitrile copolymer fiber and polyacrylamide with the length of 1-10 cm, then adding silicate, uniformly mixing, adding triethanolamine, and uniformly mixing to obtain the water conservancy river sludge treatment curing agent.
8. The preparation method of the water conservancy river sludge treatment curing agent according to claim 7, wherein when the water conservancy river sludge treatment curing agent is used, the mass of the curing agent is 5-10 wt% of the sludge, and the water content of the sludge is controlled to be 25-35 wt%.
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| CN105170076A (en) * | 2015-07-14 | 2015-12-23 | 江苏城市职业学院 | Montmorillonite-based layered double hydroxide polymerization nanometer material, preparation and applications thereof |
| CN106277703A (en) * | 2016-09-05 | 2017-01-04 | 南京大学 | Sludge treatment method under combined action of physical fiber reinforcement and chemical solidification |
| CN106477836A (en) * | 2016-12-07 | 2017-03-08 | 宁波大红鹰学院 | Renovation agent for pollution administration river bottom mud and its preparation method and application |
| CN110876918A (en) * | 2018-09-06 | 2020-03-13 | 中国石油化工股份有限公司 | Preparation method of efficient nitrate radical treating agent |
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| CN105170076A (en) * | 2015-07-14 | 2015-12-23 | 江苏城市职业学院 | Montmorillonite-based layered double hydroxide polymerization nanometer material, preparation and applications thereof |
| CN106277703A (en) * | 2016-09-05 | 2017-01-04 | 南京大学 | Sludge treatment method under combined action of physical fiber reinforcement and chemical solidification |
| CN106477836A (en) * | 2016-12-07 | 2017-03-08 | 宁波大红鹰学院 | Renovation agent for pollution administration river bottom mud and its preparation method and application |
| CN110876918A (en) * | 2018-09-06 | 2020-03-13 | 中国石油化工股份有限公司 | Preparation method of efficient nitrate radical treating agent |
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