CN112028524A - Preparation method of steel slag mineral powder grinding aid modification-based admixture - Google Patents
Preparation method of steel slag mineral powder grinding aid modification-based admixture Download PDFInfo
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/52—Grinding aids; Additives added during grinding
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Abstract
The application relates to the field of modification of steel slag mineral powder, and particularly discloses a preparation method of an admixture modified by a grinding aid based on the steel slag mineral powder. The preparation method comprises the following steps: mixing ethyl orthosilicate, absolute ethyl alcohol and deionized water to obtain a primary mixture; continuously dropwise adding 1mL of N, N-dimethylformamide into the primary mixture, and stirring to obtain sol; modifying the sol with graphene, freeze-drying, and taking out to obtain modified silicon dioxide aerogel; mixing the modified silicon dioxide aerogel, the sintering aid and the modified talcum powder to form a mixture; and adding the mixture into a solvent, and performing ball milling to form slurry. The preparation method has the advantage of reducing the influence of the auxiliary agent on the strength of the concrete.
Description
Technical Field
The application relates to the field of modification of steel slag mineral powder, in particular to a preparation method of an admixture modified by a grinding aid based on the steel slag mineral powder.
Background
At present, the most commonly used mineral admixtures comprise blast furnace slag, fly ash, silica fume and the like, in an alkaline environment in concrete, the active mineral admixtures can react with calcium hydroxide generated by hydration of portland cement to generate hydration products such as C-S-H gel and the like, the content of the calcium hydroxide is reduced, the particles of the hydration products become fine, the compactness of an interface transition zone is improved, and the microstructure of the concrete is improved.
The related technology can refer to Chinese patent application with publication number CN109020289A, which discloses a steel slag powder grinding aid with large mixing amount for improving hydration speed and a preparation method thereof, wherein the grinding aid comprises water, industrial salt, anhydrous sodium sulphate, sodium bicarbonate, sodium nitrite, urea, lignosulfonic acid, triethanolamine, hydramine complex, glycerol and sugar. In the related technology, the addition of the auxiliary agent into the steel slag mineral powder is considered to reinforce other properties of the concrete, but the addition of the auxiliary agent can damage the connection property of the concrete, thereby influencing the strength of the concrete.
In view of the above-mentioned related technologies, the inventors believe that the addition of an auxiliary agent to the steel slag ore powder destroys the bonding properties of the concrete, thereby affecting the strength of the concrete.
Disclosure of Invention
In order to reduce the influence of the auxiliary agent on the strength of concrete, the application provides a preparation method of an admixture modified by a grinding aid based on steel slag mineral powder.
The preparation method of the admixture based on steel slag mineral powder grinding aid modification adopts the following technical scheme:
a preparation method of an admixture based on steel slag mineral powder grinding aid modification comprises the following steps:
s1, mixing ethyl orthosilicate, absolute ethyl alcohol and deionized water according to a mass ratio of 1: 1.2-2: 0.25-0.5, and adjusting the pH of the mixture to 3-3.5 to obtain a primary mixture; continuously dropwise adding 1mL of N, N-dimethylformamide into the primary mixture, adjusting the pH of the primary mixture to 6-7, and stirring to obtain sol;
s2, modifying the sol by using graphene, and then carrying out freeze drying for 48-72h at the temperature of minus 40 ℃ to minus 60 ℃; taking out and drying to obtain modified silicon dioxide aerogel;
s3, mixing the modified silicon dioxide aerogel, the sintering aid and the modified talcum powder according to the weight ratio of 30: 0.4-0.8: 3-6, mixing to form a mixture; and adding the mixture into a solvent according to the mass volume ratio of 0.4kg/L, and performing ball milling for 18h to form slurry.
By adopting the technical scheme, colloidal silica is selected as a grinding aid, and the colloidal silica is prepared into aerogel, so that the silica aerogel is conveniently used as a carrier of the flame retardant, the possibility of direct contact between the flame retardant and concrete is reduced, and the influence of the flame retardant on the strength of the concrete is reduced.
Preferably, in the step S2, the specific step of modifying the sol with graphene is as follows: adding the graphene colloid into the sol prepared in the step S1, and stirring to obtain mixed sol; and adding 0.5-1mL of N, N dimethylformamide into the mixed sol, adjusting the pH value of the mixed sol to 6-7, and standing for 20-30min to obtain mixed gel.
Through adopting above-mentioned technical scheme, through carrying out the graphite alkene to silica aerogel and modifying, increase the pore mechanism in the silica, improve the ability that silica aerogel holds the fire retardant to reduce the direct possibility with concrete contact of fire retardant.
Preferably, the mass ratio of the sol to the graphene colloid is 50-60: 1.
through adopting above-mentioned technical scheme, after the graphite alkene colloid addition increases gradually, the pore structure in the silica aerogel also can increase gradually, is convenient for improve the holding capacity of aerogel to the fire retardant, reduces the possibility that the fire retardant influences the concrete intensity.
Preferably, in the step S3, the slurry is sintered for 2h at the temperature of 360-400 ℃, and cooled and ground after being taken out of the furnace.
Through adopting above-mentioned technical scheme, can get rid of the graphite alkene molecule among the thick liquids sintering process, further increase the pore structure in the aerogel to improve the holding capacity of silica aerogel to the fire retardant.
Preferably, the sintering pressure is 40-60 MPa.
Through adopting above-mentioned technical scheme, through setting up ambient pressure in sintering process, the fire retardant of being convenient for gets into in the pore structure of aerogel under ambient pressure's the drive effect.
Preferably, in the step S3, a defoaming agent and a dispersing agent are further added to the mixture, and the weight ratio of the modified silica aerogel to the defoaming agent to the dispersing agent is 30: 0.2-0.4: 1-1.5; the dispersant is cetylpyridinium bromide.
Through adopting above-mentioned technical scheme, through adding the mixing agent in the mixture to intensive mixing, the fire retardant homodisperse of being convenient for is in silicon dioxide aerogel, and the phenomenon that reduces the fire retardant and gathers into a group appears, thereby improves the possibility that the fire retardant gets into in the pore structure of aerogel.
Preferably, in step S3, the talc powder modification process specifically includes the following steps: mixing talcum powder and 5mol/L phosphoric acid solution, ball-milling for 2-3h by a ball mill, and continuously adding urea, wherein the weight ratio of the talcum powder to the phosphoric acid solution to the urea is 50-60: 3-5: 1, heating to 100 ℃ under a stirring state, keeping the temperature for 15-20min, continuing heating to 125 ℃, keeping the temperature for 5min, and stopping heating to obtain a cured product; taking out the condensate, cooling to room temperature, grinding and sieving to obtain modified talcum powder;
by adopting the technical scheme, phosphoric acid and urea react to generate ammonium phosphate, and the ammonium phosphate is used for modifying the talcum powder, so that the flame retardant capability of the talcum powder can be improved; meanwhile, the talcum powder is used as a high-temperature flame retardant, and cannot be decomposed under the heating condition of 300-400 ℃, so that the graphene can be conveniently calcined and removed under the high-temperature state.
Preferably, the talc is calcined at 350 ℃ for 2-3h at 300 ℃ before mixing the talc with the phosphoric acid solution.
By adopting the technical scheme, the talcum powder is preheated, so that the talcum powder can reach the reaction temperature as soon as possible after being mixed with phosphoric acid and urea, and the reaction efficiency is improved.
In summary, the present application has the following beneficial effects:
1. the colloidal silica is selected as the grinding aid and is prepared into the aerogel, so that the silica aerogel is conveniently used as a carrier of the flame retardant, the possibility that the flame retardant is directly contacted with concrete is reduced, and the influence of the flame retardant on the strength of the concrete is reduced;
2. the graphene modification is carried out on the silicon dioxide aerogel, so that a pore mechanism in silicon dioxide is increased, the flame retardant containing capacity of the silicon dioxide aerogel is improved, and the possibility that the flame retardant is directly contacted with concrete is reduced;
3. graphene molecules can be removed in the slurry sintering process, and the pore structure in the aerogel is further increased, so that the containing capacity of the silicon dioxide aerogel on the flame retardant is improved.
Detailed Description
The present application will be described in further detail with reference to examples.
Examples
Example 1
A preparation method of an admixture based on steel slag mineral powder grinding aid modification comprises the following steps:
s1, mixing ethyl orthosilicate, absolute ethyl alcohol and deionized water according to a mass ratio of 1: 1.6: 0.4, pouring into a beaker, mixing, magnetically stirring for 25min, dropwise adding 0.3mol/L hydrochloric acid to adjust the pH of the mixture to 3.3, magnetically stirring for 40min, and standing for 9 h; and continuously dropwise adding 1mL of N, N-dimethylformamide into the primary mixture, dropwise adding 0.3mol/L ammonia water to adjust the pH value of the primary mixture to 6.5, and magnetically stirring for 40min to obtain sol.
S2, adding the graphene colloid into the sol prepared in the S1, wherein the mass ratio of the sol to the graphene colloid is 55: 1, magnetically stirring for 25min to obtain mixed sol; and adding 0.8mL of N, N-dimethylformamide into the mixed sol, dropwise adding 0.3mol/L ammonia water to adjust the pH value of the mixed sol to 6.5, and standing for 25min to obtain mixed gel.
S3, pre-cooling the mixed gel at-40 ℃ for 4h, and freeze-drying at-50 ℃ for 60 h; taking out, placing in a dryer, and standing for 1.5h to obtain the graphene-silicon dioxide aerogel.
S4, mixing the graphene-silicon dioxide aerogel and the sintering aid B4C. Modified talcum powder, defoamer tributyl phosphate and dispersant cetyl pyridine bromide according to the weight ratio of 30: 0.6: 4: 0.3: 1.25 mixing to form a mixture; and adding the mixture into deionized water according to the mass volume ratio of 0.4kg/L, and performing ball milling for 18h to form slurry. The modification process of the talcum powder specifically comprises the following steps:
s4-1, placing talcum powder in a sintering furnace, and calcining for 2.5h at 330 ℃; taking out and cooling to room temperature;
s4-2, mixing the calcined talcum powder with 5mol/L phosphoric acid solution, pouring the mixture into a triangular flask after ball milling for 2.5 hours by using a ball mill, and continuously adding urea, wherein the weight ratio of the talcum powder to the phosphoric acid solution to the urea is 55: 4: 1, heating to 100 ℃ under a stirring state, keeping the temperature for 18min, continuing heating to 125 ℃, keeping the temperature for 5min, and stopping heating to obtain a cured product. Taking out the condensate, cooling to room temperature, grinding and sieving to obtain the modified talcum powder.
And S5, feeding the slurry into a pressure sintering furnace, adjusting the sintering pressure to be 50MPa and the sintering temperature to be 380 ℃, sintering for 2h at high temperature, removing graphene, discharging, cooling and grinding to obtain silicon dioxide-talcum powder compound particles.
Example 2
A preparation method of an admixture based on steel slag mineral powder grinding aid modification comprises the following steps:
s1, mixing ethyl orthosilicate, absolute ethyl alcohol and deionized water according to a mass ratio of 1: 1.2: 0.25, pouring into a beaker, mixing, magnetically stirring for 20min, dropwise adding 0.3mol/L hydrochloric acid to adjust the pH of the mixture to 3, magnetically stirring for 30min, and standing for 8 h; and continuously dropwise adding 1mL of N, N-dimethylformamide into the primary mixture, dropwise adding 0.3mol/L ammonia water to adjust the pH value of the primary mixture to 6, and magnetically stirring for 30min to obtain sol.
S2, adding the graphene colloid into the sol prepared in the S1, wherein the mass ratio of the sol to the graphene colloid is 55: 1, magnetically stirring for 20min to obtain mixed sol; and adding 0.5mL of N, N-dimethylformamide into the mixed sol, dropwise adding 0.3mol/L ammonia water to adjust the pH value of the mixed sol to 6, and standing for 20min to obtain mixed gel.
S3, pre-cooling the mixed gel at-40 ℃ for 2h, and freeze-drying at-40 ℃ for 48 h; taking out, placing in a dryer, and standing for 1h to obtain the graphene-silicon dioxide aerogel.
S4, mixing the graphene-silicon dioxide aerogel and the sintering aid B4C. Modified talcum powder, defoamer tributyl phosphate and dispersant cetyl pyridine bromide according to the weight ratio of 30: 0.4: 3: 0.2: 1.25 mixing to form a mixture; and adding the mixture into deionized water according to the mass volume ratio of 0.4kg/L, and performing ball milling for 18h to form slurry. The modification process of the talcum powder specifically comprises the following steps:
s4-1, placing talcum powder in a sintering furnace, and calcining for 2 hours at 300 ℃; taking out and cooling to room temperature;
s4-2, mixing the calcined talcum powder with 5mol/L phosphoric acid solution, pouring the mixture into a triangular flask after ball milling for 2 hours by a ball mill, and continuously adding urea, wherein the weight ratio of the talcum powder to the phosphoric acid solution to the urea is 50: 3: 1, heating to 100 ℃ under a stirring state, keeping the temperature for 15min, continuing heating to 125 ℃, keeping the temperature for 5min, and stopping heating to obtain a cured product. Taking out the condensate, cooling to room temperature, grinding and sieving to obtain the modified talcum powder.
And S5, feeding the slurry into a pressure sintering furnace, adjusting the sintering pressure to be 50MPa and the sintering temperature to be 360 ℃, sintering for 2h at high temperature, removing graphene, discharging, cooling and grinding to obtain silicon dioxide-talcum powder compound particles.
Example 3
A preparation method of an admixture based on steel slag mineral powder grinding aid modification comprises the following steps:
s1, mixing ethyl orthosilicate, absolute ethyl alcohol and deionized water according to a mass ratio of 1: 2: 0.5, pouring into a beaker, mixing, magnetically stirring for 30min, dropwise adding 0.3mol/L hydrochloric acid to adjust the pH of the mixture to 3.5, magnetically stirring for 60min, and standing for 10 h; and continuously dropwise adding 1mL of N, N-dimethylformamide into the primary mixture, dropwise adding 0.3mol/L ammonia water to adjust the pH value of the primary mixture to 6, and magnetically stirring for 60min to obtain sol.
S2, adding the graphene colloid into the sol prepared in the S1, wherein the mass ratio of the sol to the graphene colloid is 55: 1, magnetically stirring for 30min to obtain mixed sol; and adding 1mL of N, N-dimethylformamide into the mixed sol, dropwise adding 0.3mol/L ammonia water to adjust the pH value of the mixed sol to 7, and standing for 30min to obtain mixed gel.
S3, pre-cooling the mixed gel at-40 ℃ for 6h, and freeze-drying at 60 ℃ for 72 h; taking out, placing in a dryer, and standing for 2h to obtain the graphene-silicon dioxide aerogel.
S4, mixing the graphene-silicon dioxide aerogel and the sintering aid B4C. Modified talcum powder, defoamer tributyl phosphate and dispersant cetyl pyridine bromide according to the weight ratio of 30: 0.8: 6: 0.4: 1.25 mixing to form a mixture; and adding the mixture into deionized water according to the mass volume ratio of 0.4kg/L, and performing ball milling for 18h to form slurry. The modification process of the talcum powder specifically comprises the following steps:
s4-1, placing talcum powder in a sintering furnace, and calcining for 3h at 350 ℃; taking out and cooling to room temperature;
s4-2, mixing the calcined talcum powder with 5mol/L phosphoric acid solution, pouring the mixture into a triangular flask after ball milling for 3 hours by using a ball mill, and continuously adding urea, wherein the weight ratio of the talcum powder to the phosphoric acid solution to the urea is 60: 5: 1, heating to 100 ℃ under a stirring state, keeping the temperature for 20min, continuing heating to 125 ℃, keeping the temperature for 5min, and stopping heating to obtain a cured product. Taking out the condensate, cooling to room temperature, grinding and sieving to obtain the modified talcum powder.
And S5, feeding the slurry into a pressure sintering furnace, adjusting the sintering pressure to be 50MPa and the sintering temperature to be 400 ℃, sintering for 2h at high temperature, removing graphene, discharging, cooling and grinding to obtain silicon dioxide-talcum powder compound particles.
Example 4
Example 4 is different from example 1 in that, in the step S2, the mass ratio of the sol to the graphene colloid is 60: 1.
example 5
Example 5 differs from example 1 in that in the S2 step, the mass ratio of the sol to the graphene colloid is 50: 1.
example 6
Example 6 is different from example 1 in that the sintering pressure in the step of S5 is 40 MPa.
Example 7
Example 7 is different from example 1 in that the sintering pressure in the step of S5 is 60 MPa.
Example 8
Example 8 is different from example 1 in that, in step S4, the weight ratio of graphene-silica aerogel to dispersant is 30: 1.
example 9
Example 9 is different from example 1 in that, in step S4, the weight ratio of graphene-silica aerogel to dispersant is 30: 1.5.
comparative example
Comparative example 1
Comparative example 1 is different from example 1 in that no graphene modification is added to the silica aerogel.
Comparative example 2
The comparative example 2 is different from the example 1 in that, in the S2 step, the mass ratio of the sol to the graphene colloid is 40: 1.
comparative example 3
The comparative example 3 is different from the example 1 in that, in the step S2, the mass ratio of the sol to the graphene colloid is 80: 1.
comparative example 4
Comparative example 4 is different from example 1 in that the sintering pressure is 0MPa in the S5 step.
Comparative example 5
Comparative example 5 is different from example 1 in that the sintering pressure is 100MPa in the S5 step.
Comparative example 6
Comparative example 6 is different from example 1 in that the weight ratio of graphene-silica aerogel and dispersant in step S4 is 30: 0.5.
comparative example 7
Comparative example 7 is different from example 1 in that the weight ratio of graphene-silica aerogel and dispersant in step S4 is 30: 2.5.
comparative example 8
Comparative example 8 differs from example 1 in that the modified talc is replaced with an equal amount of unmodified talc in step S4.
Comparative example 9
Comparative example 9 differs from example 1 in that in step S4, the modified talc was replaced with an equal amount of ammonium polyphosphate.
Comparative example 10
Comparative example 10 differs from example 1 in that the modified talc is replaced with an equal amount of aluminum hydroxide in step S4.
Performance test
Detection method/test method
The grinding aid prepared in examples 1-9 and comparative examples 1-10 was mixed with converter slag and blast furnace slag according to a weight ratio of 1: 5: 30, putting the mixture into an electric furnace, and preserving heat for 1h at 1500 ℃ to obtain the steel slag mineral powder. Respectively preparing concrete test pieces from the steel slag mineral powder prepared in the examples 1 to 9 and the comparative examples 1 to 10 according to GB/T50081-2012 standard of testing method for mechanical properties of common concrete, and testing slump, compressive strength and flexural strength, wherein the size of the concrete test piece is 100mm multiplied by 100mm, and the test results are shown in Table 1; respectively measuring the UL-94 grade of the concrete test piece according to GB/T2408/IEC 60695-2003; the test results are shown in table 2.
TABLE 1
| Slump/mm | Compressive strength/MPa 3 days | Compressive strength/MPa for 7 days | 28 day compressive strength/MPa | |
| Example 1 | 158 | 45.22 | 51.85 | 60.03 |
| Example 2 | 162 | 45.23 | 50.02 | 60.45 |
| Example 3 | 159 | 44.16 | 50.53 | 61.00 |
| Example 4 | 152 | 43.16 | 48.98 | 58.77 |
| Example 5 | 168 | 46.79 | 53.07 | 62.31 |
| Example 6 | 154 | 43.63 | 49.05 | 59.11 |
| Example 7 | 163 | 46.82 | 52.94 | 62.46 |
| Example 8 | 156 | 43.07 | 49.68 | 58.48 |
| Example 9 | 166 | 47.77 | 52.31 | 63.08 |
| Comparative example 1 | 138 | 36.61 | 42.62 | 50.13 |
| Comparative example 2 | 148 | 39.52 | 44.58 | 52.09 |
| Comparative example 3 | 167 | 46.14 | 52.95 | 62.05 |
| Comparative example 4 | 146 | 38.52 | 43.33 | 51.16 |
| Comparative example 5 | 153 | 43.29 | 49.21 | 56.42 |
| Comparative example 6 | 154 | 42.08 | 43.01 | 52.29 |
| Comparative example 7 | 166 | 46.61 | 52.37 | 62.88 |
| Comparative example 8 | 156 | 45.98 | 50.66 | 60.94 |
| Comparative example 9 | 159 | 46.01 | 51.13 | 59.82 |
| Comparative example 10 | 160 | 44.51 | 51.85 | 59.69 |
TABLE 2
| UL-94 rating | UL-94 rating | ||
| Example 1 | V-0 | Comparative example 1 | V-0 |
| Example 2 | V-0 | Comparative example 2 | V-0 |
| Example 3 | V-0 | Comparative example 3 | V-0 |
| Example 4 | V-0 | Comparative example 4 | V-0 |
| Example 5 | V-0 | Comparative example 5 | V-0 |
| Example 6 | V-0 | Comparative example 6 | V-0 |
| Example 7 | V-0 | Comparative example 7 | V-0 |
| Example 8 | V-0 | Comparative example 8 | V-0 |
| Example 9 | V-0 | Comparative example 9 | V-2 |
| Comparative example 10 | V-0 | Comparative example 10 | NR |
| Comparative example 11 | NR |
Combining examples 1, 4 and 5 and comparative examples 1 to 3 with table 1, it can be seen that, as the addition amount of graphene increases, the slump and compressive strength of the concrete sample are both significantly increased, and when the mass ratio of the sol to the graphene colloid is 50: and 1, continuously increasing the content of the graphene, wherein the slump and the compressive strength of the concrete sample are not obviously changed. The silicon dioxide aerogel is not modified by graphene, so that the slump and the compressive strength of a concrete test piece are obviously reduced.
It can be seen from the combination of examples 1, 6 and 7 and comparative examples 4 and 5 and from table 1 that as the sintering pressure increases, the slump and the compressive strength of the concrete specimen both increase significantly, and when the sintering pressure is 100MPa, the slump and the compressive strength of the concrete specimen decrease somewhat.
Combining examples 1, 8, 9 and comparative examples 6, 7 with table 1, it can be seen that as the addition amount of the dispersant increases, the slump and compressive strength of the concrete test piece are significantly increased, and when the weight ratio of the graphene-silica aerogel to the dispersant is 30: and 1.5, the adding amount of the dispersing agent is continuously increased, and the slump and the compressive strength of the concrete sample are not obviously changed.
It can be seen by combining example 1 and comparative examples 8 to 10 with table 2 that the flame retardant effect is significantly reduced when the flame retardant is replaced with unmodified talc, aluminum hydroxide or ammonium polyphosphate.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. A preparation method of an admixture modified by a grinding aid based on steel slag mineral powder is characterized by comprising the following steps:
s1, mixing ethyl orthosilicate, absolute ethyl alcohol and deionized water according to a mass ratio of 1: 1.2-2: 0.25-0.5, and adjusting the pH of the mixture to 3-3.5 to obtain a primary mixture; continuously dropwise adding 1mL of N, N-dimethylformamide into the primary mixture, adjusting the pH of the primary mixture to 6-7, and stirring to obtain sol;
s2, modifying the sol by using graphene, and then carrying out freeze drying for 48-72h at the temperature of minus 40 ℃ to minus 60 ℃; taking out and drying to obtain modified silicon dioxide aerogel;
s3, mixing the modified silicon dioxide aerogel, the sintering aid and the modified talcum powder according to the weight ratio of 30: 0.4-0.8: 3-6, mixing to form a mixture; and adding the mixture into a solvent according to the mass volume ratio of 0.4kg/L, and performing ball milling for 18h to form slurry.
2. The preparation method of the steel slag mineral powder grinding aid modification-based admixture according to claim 1, which is characterized by comprising the following steps of: in the step S2, the specific steps of modifying the sol with graphene are as follows: adding graphene colloid into the sol prepared in the step S1, and stirring to obtain mixed sol; and adding 0.5-1mL of N, N dimethylformamide into the mixed sol, adjusting the pH value of the mixed sol to 6-7, and standing for 20-30min to obtain mixed gel.
3. The preparation method of the steel slag mineral powder grinding aid modification-based admixture according to claim 2, which is characterized by comprising the following steps of: the mass ratio of the sol to the graphene colloid is 50-60: 1.
4. the preparation method of the steel slag mineral powder grinding aid modification-based admixture according to claim 1 or 2, which is characterized in that: in the step S3, the slurry is sintered for 2h at the temperature of 360-400 ℃, and cooled and ground after being taken out of the furnace.
5. The preparation method of the steel slag mineral powder grinding aid modification-based admixture according to claim 4, which is characterized by comprising the following steps of: the sintering pressure is 40-60 MPa.
6. The preparation method of the steel slag mineral powder grinding aid modification-based admixture according to claim 1, which is characterized by comprising the following steps of: in the step S3, a defoaming agent and a dispersing agent are also added into the mixture, and the weight ratio of the modified silicon dioxide aerogel to the defoaming agent to the dispersing agent is 30: 0.2-0.4: 1-1.5; the dispersant is cetylpyridinium bromide.
7. The preparation method of the steel slag mineral powder grinding aid modification-based admixture according to claim 1, which is characterized by comprising the following steps of: in step S3, the process for modifying talc powder specifically includes the steps of: mixing talcum powder and 5mol/L phosphoric acid solution, ball-milling for 2-3h by using a ball mill, and continuously adding urea; the weight ratio of the talcum powder to the phosphoric acid solution to the urea is 50-60: 3-5: 1, heating to 100 ℃ under a stirring state, keeping the temperature for 15-20min, continuing heating to 125 ℃, keeping the temperature for 5min, and stopping heating to obtain a cured product; taking out the condensate, cooling to room temperature, grinding and sieving to obtain the modified talcum powder.
8. The preparation method of the steel slag mineral powder grinding aid modification-based admixture according to claim 7, which is characterized by comprising the following steps of: before mixing the talcum powder and the phosphoric acid solution, calcining the talcum powder at the temperature of 300-350 ℃ for 2-3 h.
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| CN114031840A (en) * | 2021-12-01 | 2022-02-11 | 江苏弘奇金属科技有限公司 | High-temperature-resistant anti-puncture winding film and production process thereof |
| CN114940596A (en) * | 2022-06-22 | 2022-08-26 | 盐城市鼎力新材料有限公司 | Wear-resistant ultrafine mineral admixture for cement and preparation method thereof |
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| CN107235744A (en) * | 2017-06-02 | 2017-10-10 | 东南大学 | A kind of preparation method of graphene aerosil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107235744A (en) * | 2017-06-02 | 2017-10-10 | 东南大学 | A kind of preparation method of graphene aerosil |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114031840A (en) * | 2021-12-01 | 2022-02-11 | 江苏弘奇金属科技有限公司 | High-temperature-resistant anti-puncture winding film and production process thereof |
| CN114940596A (en) * | 2022-06-22 | 2022-08-26 | 盐城市鼎力新材料有限公司 | Wear-resistant ultrafine mineral admixture for cement and preparation method thereof |
| CN114940596B (en) * | 2022-06-22 | 2022-11-29 | 盐城市鼎力新材料有限公司 | Wear-resistant ultrafine mineral admixture for cement and preparation method thereof |
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