CN108117365B - Method for producing conductive material and conductive material - Google Patents
Method for producing conductive material and conductive material Download PDFInfo
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- CN108117365B CN108117365B CN201711441288.6A CN201711441288A CN108117365B CN 108117365 B CN108117365 B CN 108117365B CN 201711441288 A CN201711441288 A CN 201711441288A CN 108117365 B CN108117365 B CN 108117365B
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/90—Electrical properties
- C04B2111/94—Electrically conducting materials
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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
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a preparation method of a conductive material, which comprises the following steps: mixing water, agar powder, nano carbon black, KOH and Al2O3And Ca (OH)2Preparing a chemical solution according to the mass ratio of the raw material components of the preset chemical solution; adding clay ceramsite into the chemical solution and stirring to obtain conductive ceramsite; preparing an alkali activator from NaOH, water glass and water according to a preset mass ratio of raw material components of the alkali activator; preparing slurry from fly ash, slag, the alkali activator and the conductive ceramsite according to the mass ratio of raw material components of a conductive material; and forming and maintaining the slurry to obtain the conductive material. The invention improves the conductivity, the impermeability and the corrosion resistance of the material, and is energy-saving and environment-friendly.
Description
Technical Field
The invention relates to the technical field of conductive materials, in particular to a preparation method of a conductive material and the conductive material.
Background
The conductive concrete is a special concrete with certain electrical property and mechanical property. Because of the conductivity, the agility and the like, the material not only can be used as a building bearing material, but also plays an important role in the aspects of electromagnetic interference shielding, industrial static electricity prevention, metal corrosion prevention cathode protection technology, building ground heating, deicing and snow melting and the like. The traditional conductive concrete is prepared by mixing ordinary portland cement serving as a main cementing material, sand, stone, water and a conductive material (such as graphite, carbon fiber and the like) according to a certain proportion. The chemical components of ordinary portland cement include tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite, which react with water and harden to form a solid-liquid-gas three-phase porous system, in which the liquid phase water and electrolyte ions dissolved in the water make the cement stone have a certain conductivity.
The conductive concrete is required to have good conductivity while meeting performance indexes such as strength, resistivity and the like. The conductive concrete is continuously used in actual engineering instead of the traditional conductive material due to the advantages of simple manufacturing process, easily obtained material, low manufacturing cost and the like. However, the inventors of the present invention have found through research that the conductive concrete based on cement as a binding material has the following disadvantages: (1) as the hydration reaction of cement proceeds, free water in the system is gradually converted into chemical bound water, the reduction of the free water greatly reduces the conductivity of the system, and the conductivity of the ordinary cement concrete is reported to be mainly determined by the conductivity and occupied volume fraction of the hardened cement paste, and the resistivity of the cement concrete reaches 6.7 x 106 omega m under normal temperature and normal humidity states. In order to improve the conductivity of the concrete, the early mechanical property of the cement concrete adopting a larger water-cement ratio is greatly reduced, and the actual construction requirement cannot be met; (2) aggregate in concrete is generally a poor conductor. Among them, stone as a concrete coarse aggregate has a small iron content, is generally an insulator, and has conductivity only at an ultrahigh temperature. Tests show that the quartz sand is an insulator material with relatively stable performance. The aggregate occupies most of the volume of the concrete, so that the conductivity of the concrete is greatly reduced; (3) the cement production and preparation process is complex, a large amount of energy and resources are needed, and the production and the use of the cement cause serious pollution and damage to the environment.
Disclosure of Invention
The embodiment of the invention provides a preparation method of a conductive material and the conductive material, which improve the conductivity, the impermeability and the corrosion resistance of the material, and are energy-saving and environment-friendly.
In order to achieve the above object, an embodiment of the present invention provides a method for preparing a conductive material, including:
mixing water, agar powder, nano carbon black, KOH and Al2O3And Ca (OH)2Preparing a chemical solution according to the mass ratio of the raw material components of the preset chemical solution;
adding clay ceramsite into the chemical solution and stirring to obtain conductive ceramsite;
preparing an alkali activator from NaOH, water glass and water according to a preset mass ratio of raw material components of the alkali activator;
preparing slurry from fly ash, slag, the alkali activator and the conductive ceramsite according to the mass ratio of raw material components of a conductive material;
and forming and maintaining the slurry to obtain the conductive material.
Further, the preset chemical solution comprises the following raw material components in percentage by mass: water: agar powder: nano carbon black: KOH: al (Al)2O3:Ca(OH)2＝100:(3～6):(4～6):(1～2):(3.5～5):(7.5～9)。
Further, the alkali-activator comprises the following raw material components in percentage by mass: NaOH: water glass: water 1: 10.72: (14.21-16.82), wherein the modulus of the water glass is in the range of 0.8-2.0, and Na in the water glass2The content range of O is 3 to 6 percent;
further, the raw material components of the conductive material are in the mass ratio: fly ash: slag: alkali activator: 1, conductive ceramsite: (0.11-0.25): (0.55-0.62): (0.53-1.26).
Further, the preparing of the slurry by the fly ash, the slag, the alkali-activator and the conductive ceramsite according to the mass ratio of the raw material components of the conductive material specifically comprises:
weighing fly ash, slag, the alkali activator and the conductive ceramsite according to the mass ratio of the raw material components of the conductive material;
stirring the fly ash and the slag to obtain a first stirring body;
adding the alkali activator into the first stirring body and stirring to obtain a second stirring body;
and adding the conductive ceramsite into the second stirring body, and stirring to obtain the slurry.
Further, the stirring time of the first stirring body and the alkali activator is 30s, and the stirring time of the second stirring body and the conductive ceramsite is 120 s.
Further, the mass ratio of water to ash in the raw materials of the alkali-activating agent is 0.35-0.45, wherein the ash comprises the fly ash and the slag.
Further, the forming and curing of the slurry to obtain the conductive material includes:
injecting the slurry into a mold for molding, curing the slurry in the mold for a preset time, and then removing the mold to obtain the conductive material; wherein the environmental temperature for maintaining the slurry is 20 +/-2 ℃, and the humidity is more than 95%;
the process of injecting the slurry into a mold for molding further comprises the following steps: vibrating the slurry injected into the mold by adopting an electrode net to eliminate air bubbles in the slurry;
further, the fly ash is II-grade fly ash, wherein SiO in the fly ash2、Al2O3And Fe2O3The sum of the contents of the components is more than 50 percent, and SO in the fly ash3The content of the fly ash is not more than 3%, the content of CaO in the fly ash is not more than 4%, the fineness of the fly ash is not more than 25%, the fineness is represented by the residue of a 45-micron square-hole sieve, the water requirement of the fly ash is not more than 105%, and the burning quantity of the fly ash is not more than 8%;
the slag is S95 grade slag, wherein CaO and SiO in the slag2、Al2O3And MgO, the sum of the contents of which is more than 95%, and SO of the slag3The content is not more than 4%, the chloride ion content of the slag is not more than 0.02%, the vitreous body content of the slag is not less than 85%, the water content of the slag is not more than 1.0%, and the specific surface area of the slag is not less than 350m2Per Kg, the slag has a 7-day and 28-day activity index specifications of not less than 75% and 95%, respectively.
The particle size of the clay ceramsite is 2-5mm, and the apparent density of the clay ceramsite is not more than 1.20g/cm3The water absorption of the clay ceramsite is more than 6.5%.
Correspondingly, the embodiment of the invention also provides a conductive material prepared by the preparation method of the conductive material provided by any embodiment of the invention.
Drawings
FIG. 1 is a schematic diagram illustrating steps of a method for manufacturing a conductive material according to an embodiment of the present invention;
FIG. 2 is a process flow diagram of a method for preparing a conductive material according to an embodiment of the present invention;
FIG. 3 is a chemical structural diagram of an alkali-activated aluminosilicate gel;
FIG. 4 is a graph of resistivity versus curing age for the fly ash/slag based alkali-activated conductive cement versus conventional cement cements of examples 1 and 2.
FIG. 5 is a graph showing the relationship between the resistivity and the curing age of mortar and lightweight aggregate concrete prepared in examples 3 and 4 using the alkali-activated conductive material based on fly ash/slag.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic step diagram of a method for preparing a conductive material according to an embodiment of the present invention is shown; the method comprises the following steps:
s1, mixing water, agar powder, nano carbon black, KOH and Al2O3And Ca (OH)2Preparing a chemical solution according to the mass ratio of the raw material components of the preset chemical solution;
s2, adding clay ceramsite into the chemical solution, and stirring to obtain conductive ceramsite; the clay ceramsite is dried clay ceramsite;
s3, preparing an alkali activator from NaOH, water glass and water according to the preset mass ratio of the raw material components of the alkali activator;
s4, preparing slurry from the fly ash, the slag, the alkali activator and the conductive ceramsite according to the mass ratio of the raw material components of the conductive material;
and S5, forming and curing the slurry to obtain the conductive material.
Further, the preset chemical solution comprises the following raw material components in percentage by mass: water: agar powder: nano carbon black: KOH: al (Al)2O3:Ca(OH)2＝100:(3～6):(4～6):(1～2):(3.5～5):(7.5～9)。
Further, the alkali-activator comprises the following raw material components in percentage by mass: NaOH: water glass: water 1: 10.72: (14.21-16.82), wherein the modulus of the water glass is in the range of 0.8-2.0, and Na in the water glass2The content range of O is 3 to 6 percent;
further, the raw material components of the conductive material are in the mass ratio: fly ash: slag: alkali activator: 1, conductive ceramsite: (0.11-0.25): (0.55-0.62): (0.53-1.26).
Further, the step S4, wherein the preparing of the slurry from the fly ash, the slag, the alkali-activator, and the conductive ceramsite according to the mass ratio of the raw material components of the conductive material specifically includes:
s41, weighing the fly ash, the slag, the alkali activator and the conductive ceramsite according to the mass ratio of the raw material components of the conductive material;
s42, stirring the fly ash and the slag to obtain a first stirring body;
s43, adding the alkali activator into the first stirring body, and stirring to obtain a second stirring body; specifically, the first stirring body and the alkali activator may be placed in a stirrer to be stirred;
and S44, adding the conductive ceramsite into the second stirring body, and stirring to obtain the slurry.
Preferably, the stirring time of the first stirring body and the alkali-activator in step S43 is 30S, and the stirring time of the second stirring body and the conductive ceramsite in step S44 is 120S.
Further, the mass ratio of water to ash in the raw materials of the alkali-activating agent is 0.35-0.45, wherein the ash comprises the fly ash and the slag.
Further, the forming and curing of the slurry in step S5 to obtain the conductive material specifically includes:
injecting the slurry into a mold for molding, curing the slurry in the mold for a preset time, and then removing the mold to obtain the conductive material; wherein the environmental temperature for maintaining the slurry is 20 +/-2 ℃, and the humidity is more than 95%; the process of injecting the slurry into a mold for molding further comprises the following steps: and vibrating the slurry injected into the mold by adopting an electrode mesh (titanium mesh) to eliminate air bubbles in the slurry.
For example, the slurry is injected into a mold, when the injected slurry reaches 1/2 of the mold capacity, an electrode mesh (titanium mesh) is added, the slurry is vibrated to eliminate air bubbles, the slurry is injected again, the slurry is vibrated and molded, and the mold is removed after 1 day of maintenance to obtain the conductive material.
The volume of the mould may be dimensioned accordingly, e.g. 40 x 160mm, as required.
Further, the fly ash is II-grade fly ash, wherein SiO in the fly ash2、Al2O3And Fe2O3The sum of the contents of the components is more than 50 percent, and SO in the fly ash3The content of the fly ash is not more than 3%, the content of CaO in the fly ash is not more than 4%, the fineness of the fly ash is not more than 25%, the fineness is represented by the residue of a 45-micron square-hole sieve, the water requirement of the fly ash is not more than 105%, and the burning quantity of the fly ash is not more than 8%;
the slag is S95 grade slag, wherein CaO and SiO in the slag2、Al2O3And MgO, the sum of the contents of which is more than 95%, and SO of the slag3Content of not more than 4%, chloride ion of the slagThe content is not more than 0.02%, the vitreous body content of the slag is not less than 85%, the water content of the slag is not more than 1.0%, and the specific surface area of the slag is not less than 350m2Per Kg, the slag has a 7-day and 28-day activity index specifications of not less than 75% and 95%, respectively.
The particle size of the clay ceramsite is 2-5mm, and the apparent density of the clay ceramsite is not more than 1.20g/cm3The water absorption rate of the clay ceramsite is more than 6.5%; the clay ceramsite can be directly prepared from the clay ceramsite sold on the market.
After the conductive material is obtained in step S5, after standard curing for a certain age, the conductive material is subjected to a four-point test method, a 3V dc power supply is applied to measure the current and voltage of the test block, the resistance is calculated by using the ohm theorem, and then the resistivity change trend graph is calculated. In this example, the electric resistivity of the conductive material product prepared based on the above process was measured to be 13.31 Ω · m after standard curing for 28 days.
The mechanism of the embodiment of the invention is as follows: different from hydrated calcium aluminate, ettringite and C-S-H gel generated by hydrating ordinary portland cement, the reaction product of the alkali-activated conductive material based on the low-calcium fly ash is mainly aluminosilicate gel (N-A-S-H) generated by polymerization of aluminum tetrahedron [ AlO4] and silicon tetrahedron [ SiO4] structural units generated by dissolving raw materials in A strong alkali environment. Referring to the chemical structure of the alkali-activated aluminosilicate gel shown in FIG. 3, the basic polymeric forms of Si-O-Al-chains can be classified into PS type, PSS type and PSDS type according to the Si/Al ratio (the ratio may be 1, 2, 3 in the basic constituent unit), as shown in FIG. 3 (a); the chemical structure of the aluminosilicate gel, which is mostly a network skeleton structure, is formed by connecting basic units of-Si-O-Al-chains, which simulate different Si/Al ratios, with each other by analysis of a modern computer, as shown in FIG. 3 (b).
In the alkali-activated low-calcium fly ash system, water mainly plays a role of a medium, only a small amount of water can be chemically combined into a reaction product, most of water is in a free state, and a large amount of alkali metal ions exist in the alkali-activated system, so that the electrochemical activity is high, the conductivity of the alkali-activated material is greatly improved, and compared with a common cement material, the alkali-activated material has better conductivity. And the fly ash and the slag are subjected to polycondensation reaction to make the gel more compact, so that N-A-S-H gel, needle-shaped C-S-H gel and hydrated calcium aluminate gel are respectively generated, the coagulation and hardening of slurry are promoted, and the strength of the slurry is greatly increased. According to the ion concentration of the alkali-activated material, a chemical solution complementary to the ion concentration is prepared to prepare the conductive ceramsite to replace common aggregate, so that the overall conductivity of the alkali-activated concrete is improved.
In order to better prove the technical effects of the preparation method of the conductive material provided by the embodiment of the invention, the embodiment of the invention is also illustrated by the following experimental data of the embodiment 1 to the embodiment 4:
example 1
Preparation of an alkali-activated conductive cementing material based on fly ash/slag:
(1) respectively weighing 14.15g of sodium hydroxide, 151.72g of water glass and 201.13g of water according to mass ratio, wherein the modulus of the water glass is 1.5, the content of sodium oxide is 4 percent, and the water-cement ratio is 0.4.
(2) 663.18g of fly ash, 73.69g of slag and 367.00g of alkali activator are weighed according to the mass ratio respectively.
(3) Uniformly stirring the fly ash and the slag, pouring the mixture into a paste purifying stirrer, adding an alkali activator, and stirring to prepare a paste; and (3) injecting the uniformly stirred slurry into a 40 × 160mm mould for forming, adding an electrode mesh (titanium mesh) when the volume of the injected slurry reaches 1/2 of the mould, vibrating to eliminate bubbles, injecting the slurry for vibration forming, removing the mould after 1 day of maintenance, and testing the resistivity of the slurry after standard maintenance for a certain period of time.
And (3) testing results: the resistivity was 4.36. omega. m in 28 days.
The main mechanical properties are as follows:
| mechanical properties | 7 |
30 days |
| Flexural strength (MPa) | 6.10 | 8.29 |
| Compressive strength (MPa) | 23.22 | 28.09 |
Example 2
Preparation of an alkali-activated conductive cementing material based on fly ash/slag:
(1) respectively weighing 14.15g of sodium hydroxide, 151.72g of water glass and 201.13g of water according to mass ratio, wherein the modulus of the water glass is 1.5, the content of sodium oxide is 4 percent, and the water-cement ratio is 0.4.
(2) 589.49g of fly ash, 147.37g of slag and 367.00g of alkali activator are weighed according to the mass ratio respectively.
(3) Uniformly stirring the fly ash and the slag, pouring the mixture into a paste purifying stirrer, adding an alkali activator, and stirring to prepare a paste; and (3) injecting the uniformly stirred slurry into a 40 × 160mm mould for forming, adding an electrode mesh (titanium mesh) when the volume of the injected slurry reaches 1/2 of the mould, vibrating to eliminate bubbles, injecting the slurry for vibration forming, removing the mould after 1 day of maintenance, and testing the resistivity and the strength of the slurry after standard maintenance for a certain period.
And (3) testing results: the resistivity was 9.93. omega. m in 28 days.
The main mechanical properties are as follows:
| mechanical properties | 7 |
30 days |
| Flexural strength (MPa) | 8.54 | 10.27 |
| Compressive strength (MPa) | 37.96 | 42.50 |
Example 3
And (2) doping the medium sand into an alkali-activated conductive cementing material based on fly ash/slag to prepare conductive mortar:
(1) 7.07g of sodium hydroxide, 75.86g of water glass and 100.57g of water respectively according to the mass ratio, wherein the modulus of the water glass is 1.5, the content of sodium oxide is 4 percent, and the water-cement ratio is 0.4.
(2) 294.75g of fly ash, 73.69g of slag, 183.51g of alkali activator and 746.24g of medium sand are weighed according to the mass ratio respectively.
(3) Uniformly stirring the fly ash and the slag, pouring the mixture into a mortar stirrer, adding an alkali activator, stirring at a low speed for 30s, then stirring at a low speed for 30s, simultaneously uniformly adding sand, then quickly stirring for 30s, stopping stirring for 90s, and then quickly stirring for 60 s; and (3) injecting the uniformly stirred mortar into a 40 × 160mm mould for forming, adding an electrode mesh (titanium mesh) when the injected mortar reaches the mould volume of 1/2, vibrating to eliminate bubbles, injecting the mortar for vibration forming, removing the mould after 1-day maintenance, and testing the resistivity and the strength of the mortar after standard maintenance for a certain period.
And (3) testing results: the resistivity was 30.84. omega. m in 28 days.
Example 4
The prepared conductive ceramsite is doped into an alkali-activated conductive cementing material based on fly ash/slag to prepare conductive concrete:
(1) 7.07g of sodium hydroxide, 75.86g of water glass and 100.57g of water respectively according to the mass ratio, wherein the modulus of the water glass is 1.5, the content of sodium oxide is 4 percent, and the water-cement ratio is 0.4.
(2) 294.75g of fly ash, 73.69g of slag, 183.51g of alkali activator and 273.15g of conductive ceramsite are weighed according to the mass ratio.
(3) Uniformly stirring the fly ash and the slag, pouring the mixture into a mortar stirrer, adding an alkali activator, stirring at a low speed for 30s, then stirring at a low speed for 30s, simultaneously uniformly adding sand, then quickly stirring for 30s, stopping stirring for 90s, and then quickly stirring for 60 s; and (3) injecting the uniformly stirred slurry into a 40 × 160mm mould for forming, adding an electrode mesh (titanium mesh) when the volume of the injected slurry reaches 1/2 of the mould, vibrating to eliminate bubbles, injecting the slurry for vibration forming, removing the mould after 1 day of maintenance, and testing the resistivity and the strength of the slurry after standard maintenance for a certain period.
And (3) testing results: the resistivity was 13.31. omega. m in 28 days.
The experimental data of the above examples 1 to 4 are summarized as follows, wherein Table 1 is a comparison table of the proportions of the raw materials in examples 1 to 4, and Table 2 is a comparison table of the conductivity and mechanical properties of the conductive materials of examples 1 to 4
Table 1
Table 2
In addition, referring to fig. 4 and 5, fig. 4 is a graph of resistivity versus curing age for the fly ash/slag based alkali-activated conductive cement and conventional cement cements of examples 1 and 2; FIG. 5 is a graph showing the relationship between the resistivity and the curing age of mortar and lightweight aggregate concrete prepared from the conductive materials prepared in examples 3 and 4.
According to the experimental data of the embodiments 1 to 4, the embodiments of the present invention have the following advantages:
(1) the resistivity of the alkali-activated conductive material based on the fly ash/slag prepared by the embodiment of the invention is lower than that of the traditional cement conductive concrete, and the alkali-activated conductive material has better mechanical property. The conductive ceramsite replaces the common aggregate, so that the production cost is reduced, the density of the concrete is greatly reduced, and the conductive ceramsite is more conveniently applied to actual engineering.
(2) The fly ash and the slag applied in the embodiment of the invention are both industrial solid wastes, and the alkali-activated conductive material based on the fly ash/the slag is prepared by taking the fly ash and the slag as raw materials, so that the problem of treatment of the industrial wastes is solved, and the alkali-activated conductive material is environment-friendly, energy-saving and environment-friendly.
Correspondingly, the embodiment of the invention also provides a conductive material prepared by the preparation method of the conductive material provided by any embodiment of the invention.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (7)
1. A method of making a conductive material, comprising:
mixing water, agar powder, nano carbon black, KOH and Al2O3And Ca (OH)2Preparing a chemical solution according to the mass ratio of the raw material components of the preset chemical solution;
adding clay ceramsite into the chemical solution and stirring to obtain conductive ceramsite;
preparing an alkali activator from NaOH, water glass and water according to a preset mass ratio of raw material components of the alkali activator;
preparing slurry from fly ash, slag, the alkali activator and the conductive ceramsite according to the mass ratio of raw material components of a conductive material;
forming and maintaining the slurry to obtain the conductive material;
the alkali activator comprises the following raw material components in percentage by mass: NaOH: water glass: water =1: 10.72: (14.21-16.82), wherein the modulus of the water glass is in the range of 0.8-2.0, and Na in the water glass2The content range of O is 3% -6%;
the mass ratio of the raw material components of the conductive material is as follows: fly ash: slag: alkali activator: conductive ceramsite =1: (0.11-0.25): (0.55-0.62): (0.53-1.26);
the preset chemical solution comprises the following raw material components in percentage by mass: water: agar powder: nano carbon black: KOH: al (Al)2O3:Ca(OH)2=100:(3~6):(4~6):(1~2):（3.5~5）:（7.5~9）。
2. The method for preparing the conductive material according to claim 1, wherein the step of preparing the slurry from the fly ash, the slag, the alkali-activator and the conductive ceramsite according to the mass ratio of the raw material components of the conductive material specifically comprises the following steps:
weighing fly ash, slag, the alkali activator and the conductive ceramsite according to the mass ratio of the raw material components of the conductive material;
stirring the fly ash and the slag to obtain a first stirring body;
adding the alkali activator into the first stirring body and stirring to obtain a second stirring body;
and adding the conductive ceramsite into the second stirring body, and stirring to obtain the slurry.
3. The method according to claim 2, wherein the stirring time of the first stirring body and the alkali activator is 30s, and the stirring time of the second stirring body and the conductive ceramsite is 120 s.
4. The method of claim 2, wherein a mass ratio of water to ash in the raw material of the alkali activator is 0.35 to 0.45, wherein the ash comprises the fly ash and the slag.
5. The method of claim 1, wherein the forming and curing the slurry to obtain the conductive material comprises:
injecting the slurry into a mold for molding, curing the slurry in the mold for a preset time, and then removing the mold to obtain the conductive material; wherein the environmental temperature for maintaining the slurry is 20 +/-2 ℃, and the humidity is more than 95%;
the process of injecting the slurry into a mold for molding further comprises the following steps: and vibrating the slurry injected into the mold by adopting an electrode net so as to eliminate air bubbles in the slurry.
6. The method of claim 1, wherein the fly ash is class II fly ash, wherein the SiO in the fly ash is present in the fly ash2、Al2O3And Fe2O3The sum of the contents of the components is more than 50 percent, and SO in the fly ash3The content of the fly ash is not more than 3%, the content of CaO in the fly ash is not more than 4%, the fineness of the fly ash is not more than 25%, the fineness is represented by the residue of a 45-micron square-hole sieve, the water requirement of the fly ash is not more than 105%, and the burning quantity of the fly ash is not more than 8%;
the slag is S95 grade slag, wherein CaO and SiO in the slag2、Al2O3And MgO, the sum of the contents of which is more than 95%, and SO of the slag3The content is not more than 4%, the chloride ion content of the slag is not more than 0.02%, the vitreous body content of the slag is not less than 85%, the water content of the slag is not more than 1.0%, and the specific surface area of the slag is not less than 350m2(iii) Kg, the slag having a 7-day and 28-day activity index specification of not less than 75% and 95%, respectively;
the particle size of the clay ceramsite is 2-5mm, and the apparent density of the clay ceramsite is not more than 1.20g/cm3The water absorption of the clay ceramsite is more than 6.5%.
7. A conductive material produced by the method for producing a conductive material according to any one of claims 1 to 6.
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