CN115028380B - Retarder composition for gypsum calcination - Google Patents
Retarder composition for gypsum calcination Download PDFInfo
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- CN115028380B CN115028380B CN202210742464.4A CN202210742464A CN115028380B CN 115028380 B CN115028380 B CN 115028380B CN 202210742464 A CN202210742464 A CN 202210742464A CN 115028380 B CN115028380 B CN 115028380B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B11/00—Calcium sulfate cements
- C04B11/02—Methods and apparatus for dehydrating gypsum
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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Abstract
The invention discloses a retarder composition for gypsum calcination, which selects amino acid polymers of lysine, aspartic acid, glutamic acid and threonine, calcium metaphosphate, barium sulfate and the like as main additive materials of the retarder. Different from the condition that a large amount of land is occupied and a great deal of adverse effects are generated on the environment in the traditional gypsum setting process, the retarder is added with barium sulfate and ferric oxide for stabilizing the gypsum strength, and the lime calcium, the light calcium and the heavy calcium through controlling the pH value can delay the gypsum initial setting time, greatly shorten the initial setting and final setting time difference of the gypsum setting and effectively improve the application strength of the gypsum, thereby improving the construction efficiency and reducing the waste and loss of gypsum resources.
Description
Technical Field
The invention belongs to the technical field of gypsum calcination, and particularly relates to a retarder composition for gypsum calcination. The retarder composition takes the co/homopolymer of the modified amino acid as a carrier, and besides, a retarder stabilizer, a strength stabilizer and a pH regulator are also used, so that the retarder composition special for gypsum calcination, which is convenient to use, green, pollution-free and biodegradable, is synthesized.
Background
While making a contribution to the rapid development of national economy, the modern industry not only consumes the resources of the earth at a high speed, but also discharges a large amount of solid wastes, thereby causing great threats to the sustainable development of economy and the living environment of people.
Taking the phosphorus chemical industry as an example, the amount of phosphogypsum waste generated in China per year exceeds 7000 million tons, while the existing known total amount is about 3-5 hundred million tons; other industrial plasters such as titanium gypsum, manganese gypsum, etc. are also not in the minority; in addition, the amount of desulfurized gypsum produced annually for power generation in power plants even exceeds that of industrial gypsum. Under the high sound of environmental protection, how to effectively treat a large amount of accumulated byproduct gypsum has become an urgent problem to be solved worldwide.
In the past, the gypsum is usually subjected to stacking treatment, and the method seriously restricts the comprehensive development of enterprises, not only occupies a large amount of valuable land resources and leaves huge potential safety hazards, but also ensures that the enterprises pay high stacking cost; with the resource saving as the basic national policy in China, carbon neutralization and carbon peak reaching have become the direction of common efforts of people in China, so that the green building material becomes an important link for the comprehensive utilization of the industrial byproduct gypsum.
However, the existing gypsum building materials still have certain problems, mainly including: (1) the gypsum sources are different, so that the calcined gypsum has larger fluctuation of setting time; (2) the gypsum retarder is various, and a low-end retarder which has great influence on the gypsum strength occupies a leading position; (3) the whole industry cannot form a uniform industrial chain, each link is difficult to attack in the own area, and the innovation capability of the chain is poor; taking a gypsum retarder as an example, the existing gypsum retarders circulating on the market can not bear the damage caused by the calcining temperature of the gypsum of 100-150 ℃, so that the formed industrial chain is basically in the air traffic; just the existence of the problems leads the application of industrial byproduct gypsum in China to be still too important, and how to solve the problem that the existing gypsum retarder can not be applied in gypsum calcination becomes the key direction of the current research.
Disclosure of Invention
In order to solve the problems that the traditional gypsum has larger setting time fluctuation and cannot bear high-temperature calcination, the invention aims to provide a retarder composition for gypsum calcination, which can stably improve the retarding time of gypsum, solve the construction problem and the safety problem caused by the gypsum setting time fluctuation and realize the technical scheme as follows:
a retarder composition for gypsum calcination comprises components of a gypsum retarder carrier, a retarder stabilizer, a strength stabilizer and a pH regulator, wherein the gypsum retarder carrier is prepared from raw materials including lysine, aspartic acid, glutamic acid, threonine and acetic anhydride; the retarder stabilizer is prepared from raw materials including calcium metaphosphate and calcium superphosphate; the raw materials for preparing the strength stabilizer comprise barium sulfate, ferric oxide and silicon aluminide; the raw materials for preparing the pH regulator comprise cement, ash calcium, heavy calcium and light calcium.
Preferably, the preparation steps of the components are as follows:
s1, a gypsum retarder carrier: weighing 200-300 parts by weight of lysine, 150-250 parts by weight of aspartic acid, 150-200 parts by weight of glutamic acid, 200-400 parts by weight of threonine and 1000-2000 parts by weight of industrial water, continuously stirring for 60-90min under the conditions of 180 ℃ and 1.1MPa, then adding 50 parts by weight of acetic anhydride, cooling to 80 ℃, continuously controlling and stirring for 30-50min, cooling to room temperature, standing and aging for 24-48h under the condition of 20-25 ℃, and obtaining a gypsum retarder carrier for later use;
s2, retarder stabilizer: weighing 50-100 parts by weight of calcium metaphosphate and 20-50 parts by weight of calcium superphosphate, adding 300 parts by weight of deionized water, uniformly stirring at 25 ℃ for 30-60min, and placing the lower-layer precipitate into a dryer to obtain a retarder stabilizer;
s3, strength stabilizer: weighing 50-80 parts by weight of barium sulfate, 10-40 parts by weight of ferric oxide, 10-40 parts by weight of silicon aluminide and 100-150 parts by weight of deionized water, adding into a reaction bottle, and uniformly stirring at 25 ℃ for 100-200min to obtain a strength stabilizer;
s4, pH regulator: weighing 5-10 parts by weight of cement, 4-7 parts by weight of gray calcium, 1-5 parts by weight of heavy calcium and 0.5-1 part by weight of light calcium, and preserving heat for 2-5 hours in a constant-temperature stirrer at the temperature of 40-60 ℃ to obtain a pH regulator;
homogenizing the gypsum retarder carrier, the retarder stabilizer, the strength stabilizer and the pH regulator prepared by the steps S1, S2, S3 and S4 by using solid mixing equipment, keeping the temperature at 80-120 ℃ and the pressure at 101.325KPa for 30-120min to obtain a retarder composition;
the weight ratio of the gypsum retarder carrier, the retarder stabilizer, the strength stabilizer and the pH regulator in the retarder composition is 1:1:1:1.
preferably, the lysine weighed in the S1 accounts for 200 parts by weight, the aspartic acid accounts for 150 parts by weight, the glutamic acid accounts for 150 parts by weight, the threonine accounts for 200 parts by weight, and the industrial water accounts for 1000 parts by weight.
Preferably, the S2 is weighed to obtain 50 parts by weight of calcium metaphosphate and 20 parts by weight of calcium superphosphate.
Preferably, in the step S3, 50 parts by weight of barium sulfate, 10 parts by weight of iron oxide, 10 parts by weight of silicon aluminide and 100 parts by weight of deionized water are weighed.
Preferably, the cement weighed in the step S4 is 5 parts by weight, the ash calcium is 4 parts by weight, the heavy calcium is 1 part by weight, and the light calcium is 0.5 part by weight.
The technical scheme of the retarder composition for gypsum calcination has the following beneficial effects:
1. the retarder composition for gypsum calcination, which is prepared by the invention, is mainly used for gypsum calcination and high-temperature calcination resistance in the building material industry, and can stably improve the set retarding time of gypsum, thereby solving the construction problem and the safety problem caused by the fluctuation of the gypsum setting time;
2. the retarder composition for gypsum calcination prepared by the invention can improve the calcination efficiency of gypsum and reduce the loss of strength in the application process of gypsum;
3. the method has simple operation process, abundant selected raw material resources and is suitable for industrial-grade mass production.
Drawings
FIG. 1 is a graph comparing the compressive strength data of gypsum of examples of the present invention and comparative examples
FIG. 2 is a bar graph of the flexural strength of gypsum of examples of the present invention and comparative examples.
FIG. 3 is a microstructure scan of example 1.
Fig. 4 is a scan of the microstructure of example 2.
FIG. 5 is a scanned image of the microstructure of example 1 after mixing with gypsum and setting.
FIG. 6 is a scanned microstructure of example 2 after mixing with gypsum and setting.
Detailed Description
A retarder composition for gypsum calcination comprises the following components and a preparation method of each component:
s1, a gypsum retarder carrier: weighing 200-300g of purchased industrial grade applicable lysine, 150-250g of aspartic acid, 150-200g of glutamic acid, 200-400g of threonine and 1000-2000g of industrial water, conveying the materials to a stirrer by using a belt, continuously stirring the materials for 60-90min under the conditions of 180 ℃ and 1.1MPa, then adding 50g of acetic anhydride, cooling the materials to 80 ℃, continuously controlling the stirring for 30-50min, cooling the materials to room temperature, standing and aging the materials for 24-48h under the condition of 20-25 ℃, and obtaining a gypsum retarder carrier for later use;
s2, retarder stabilizer: weighing 50-100g of insoluble calcium metaphosphate and 20-50g of insoluble calcium superphosphate, adding 300g of deionized water, uniformly stirring at 25 ℃ for 30-60min, and placing the lower-layer precipitate into a dryer to obtain a retarder stabilizer;
s3, preparing a strength stabilizer: weighing 50-80g of barium sulfate, 10-40g of ferric oxide, 10-40g of silicon aluminide and 100-150g of deionized water, adding into a reaction bottle, and uniformly stirring by mechanical force at 25 ℃ for 100-200min to obtain a strength stabilizer;
s4, preparing a pH regulator: weighing 5-10g of cement, 4-7g of ash calcium, 1-5g of heavy calcium and 0.5-1g of light calcium, and preserving heat for 2-5h in a constant-temperature stirrer at the temperature of 40-60 ℃ to obtain a pH regulator;
s5, mixing of retarder composition: and (3) homogenizing the gypsum retarder carrier, the retarder stabilizer, the strength stabilizer and the pH regulator prepared in the steps S1, S2, S3 and S4 by using solid mixing equipment, keeping the temperature at 80-120 ℃ and the pressure at 101.325KPa for 30-120min to obtain the retarder composition.
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
Example 1
A retarder composition for gypsum calcination comprises the following components and a preparation method of each component:
s1, a gypsum retarder carrier: weighing 200g of purchased industrial grade suitable lysine, 150g of aspartic acid, 150g of glutamic acid, 200g of threonine and 1000g of industrial water, conveying the materials to a stirrer by using a belt, continuously stirring the materials for 60min at 180 ℃ under 1.1MPa, then adding 50g of acetic anhydride, cooling the materials to 80 ℃, continuously controlling the stirring for 30min, cooling the materials to room temperature, standing and aging the materials for 24h at 20 ℃ to obtain a gypsum retarder carrier for later use;
s2, retarder stabilizer: weighing 50g of insoluble calcium metaphosphate and 20g of insoluble calcium superphosphate, adding 300g of deionized water, uniformly stirring at 25 ℃ for 30min, and putting the lower-layer precipitate into a dryer to obtain a retarder stabilizer;
s3, preparing a strength stabilizer: weighing 50g of barium sulfate, 10g of ferric oxide, 10g of silicon aluminide and 100g of deionized water, adding into a reaction bottle, and uniformly stirring by mechanical force at the stirring condition of 25 ℃ for 100min to obtain a strength stabilizer;
s4, preparing a pH regulator: weighing 5g of cement, 4g of ash calcium, 1g of heavy calcium and 0.5g of light calcium, and keeping the temperature in a constant-temperature stirrer at 40 ℃ for 2 hours to obtain a pH regulator;
s5, mixing of retarder composition: and (3) homogenizing the gypsum retarder carrier, the retarder stabilizer, the strength stabilizer and the pH regulator prepared in the steps S1, S2, S3 and S4 by using solid mixing equipment, keeping the temperature at 80 ℃ and the pressure at 101.325KPa for 30min to obtain the retarder composition for calcining gypsum.
Example 2
A retarder composition for gypsum calcination comprises the following components and a preparation method of each component:
s1, a gypsum retarder carrier: weighing 300g of purchased industrial grade suitable lysine, 250g of aspartic acid, 200g of glutamic acid, 400g of threonine and 2000g of industrial water, conveying the materials to a stirrer by using a belt, continuously stirring the materials for 90min at 180 ℃ and 1.1MPa, then adding 50g of acetic anhydride, cooling the materials to 80 ℃, continuously controlling the stirring for 50min, cooling the materials to room temperature, standing and aging the materials for 48h at 25 ℃ to obtain a gypsum retarder carrier for later use;
s2, retarder stabilizer: weighing 100g of slightly soluble calcium metaphosphate and 50g of slightly soluble calcium superphosphate, adding 300g of deionized water, uniformly stirring, and placing the lower-layer precipitate into a dryer under the stirring condition of 25 ℃ for 60min to obtain a retarder stabilizer;
s3, preparing a strength stabilizer: weighing 80g of barium sulfate, 40g of ferric oxide, 40g of silicon aluminide and 150g of deionized water, adding into a reaction bottle, and uniformly stirring by mechanical force at the stirring condition of 25 ℃ for 200min to obtain a strength stabilizer;
s4, preparing a pH regulator: weighing 10g of cement, 7g of ash calcium, 5g of heavy calcium and 1g of light calcium, and keeping the temperature in a constant-temperature stirrer at 60 ℃ for 5 hours to obtain a pH regulator;
s5, mixing of retarder composition: and (3) homogenizing the gypsum retarder carrier, the retarder stabilizer, the strength stabilizer and the pH regulator prepared in the steps S1, S2, S3 and S4 by using solid mixing equipment, keeping the temperature at 120 ℃ and the pressure at 101.325KPa for 120min, and thus obtaining the retarder composition.
Example 3
A retarder composition for gypsum calcination comprises the following components and a preparation method of each component:
s1, a gypsum retarder carrier: weighing 230g of purchased industrial grade suitable lysine, 180g of aspartic acid, 170g of glutamic acid, 250g of threonine and 1300g of industrial water, conveying the materials to a stirrer by using a belt, continuously stirring the materials for 70min at 180 ℃ and 1.1MPa, then adding 50g of acetic anhydride, cooling the materials to 80 ℃, continuously controlling the stirring for 38min, cooling the materials to room temperature, standing and aging the materials for 30h at 22 ℃ to obtain a gypsum retarder carrier for later use;
s2, retarder stabilizer: weighing 65g of insoluble calcium metaphosphate and 30g of insoluble calcium superphosphate, adding 300g of deionized water, uniformly stirring at 25 ℃ for 40min, and placing the lower-layer precipitate into a dryer to obtain a retarder stabilizer;
s3, preparing a strength stabilizer: weighing 60g of barium sulfate, 20g of ferric oxide, 20g of silicon aluminide and 120g of deionized water, adding into a reaction bottle, and uniformly stirring by mechanical force at the stirring condition of 25 ℃ for 140min to obtain a strength stabilizer;
s4, preparing a pH regulator: weighing 6.5g of cement, 5g of ash calcium, 2g of heavy calcium and 0.7g of light calcium, and keeping the temperature in a constant-temperature stirrer at 50 ℃ for 3 hours to obtain a pH regulator;
s5, mixing of retarder composition: and (3) homogenizing the gypsum retarder carrier, the retarder stabilizer, the strength stabilizer and the pH regulator prepared in the steps S1, S2, S3 and S4 by using solid mixing equipment, keeping the temperature at 95 ℃ and the pressure at 101.325KPa for 60min, and thus obtaining the retarder composition.
Example 4
A retarder composition for gypsum calcination comprises the following components and a preparation method of each component:
s1, a gypsum retarder carrier: weighing 280g of purchased industrial grade suitable lysine, 220g of aspartic acid, 190g of glutamic acid, 350g of threonine and 1700g of industrial water, conveying the materials to a stirrer by using a belt, continuously stirring the materials for 80min at 180 ℃ and 1.1MPa, then adding 50g of acetic anhydride, cooling the materials to 80 ℃, continuously controlling the stirring for 42min, cooling the materials to room temperature, standing and aging the materials for 40h at 24 ℃ to obtain a gypsum retarder carrier for later use;
s2, retarder stabilizer: weighing 85g of slightly soluble calcium metaphosphate and 40g of slightly soluble calcium superphosphate, adding 300g of deionized water, uniformly stirring, and placing the lower-layer precipitate into a dryer under the stirring condition of 25 ℃ for 50min to obtain a retarder stabilizer;
s3, preparing a strength stabilizer: weighing 70g of barium sulfate, 30g of ferric oxide, 30g of silicon aluminide and 140g of deionized water, adding into a reaction bottle, and uniformly stirring by mechanical force under the stirring condition of 25 ℃ for 160min to obtain a strength stabilizer;
s4, preparing a pH regulator: weighing 8.5g of cement, 6g of ash calcium, 4g of heavy calcium and 0.8g of light calcium, and preserving the heat for 4 hours in a constant-temperature stirrer at the temperature of 55 ℃ to obtain a pH regulator;
s5, mixing of retarder composition: and (3) homogenizing the gypsum retarder carrier, the retarder stabilizer, the strength stabilizer and the pH regulator prepared in the steps S1, S2, S3 and S4 by using solid mixing equipment, keeping the temperature at 105 ℃ and the pressure at 101.325KPa for 90min to obtain the retarder composition.
Comparative example 1, the same parameters as in example 1 except that lysine was not added in the step S1.
Comparative example 2 the same parameters as in example 1 were used except that aspartic acid was not added in step S1.
Comparative example 3 the same parameters as in example 1 were used except that glutamic acid was not added in the step S1.
Comparative example 4 the same parameters as in example 1 were used except that threonine was not added in the step S1.
Comparative example 5 the parameters were the same as in example 2 except that no calcium metaphosphate was added in the step S2.
Comparative example 6 the parameters were the same as in example 2 except that no calcium superphosphate was added in the step S2.
Comparative example 7 the same parameters as in example 3 were used except that barium sulfate was not added in the step S3.
Comparative example 8 the same parameters as in example 3 were used except that no iron oxide was added in the step S3.
Comparative example 9 the same parameters as in example 4 were used except that no gray calcium was added in step S4.
Comparative example 10, except that calcium was not added in the step S4, the parameters were the same as in example 4.
Comparative example 11, except that no light calcium carbonate was added in the step S4, the parameters were the same as in example 4.
An amount of each of examples 1 and 2 and comparative examples 1 to 6 was weighed and placed in a thermostatic heating flask containing gypsum, and the ratio of gypsum to gypsum retarder 100:1, adding water with the weight 0.5 time of that of the gypsum, and respectively inspecting the initial setting time and the final setting time of the gypsum, wherein the initial setting time refers to the time from the time when the gypsum powder is scattered into the water until the gypsum loses fluidity and begins to thicken under the standard thickening water consumption, and the final setting time refers to the time from the time when the gypsum powder is scattered into the water until the gypsum slurry is solidified under the standard thickening water consumption. The resulting time difference is the set time of the gypsum. The experiment was repeated five times in parallel to obtain an average, and the results are shown in table 1.
TABLE 1 initial setting time, final setting time, setting time difference of examples 1,2 and comparative examples 1 to 6
| Test sample | Initial setting time/min | Final setting time/min | Difference in coagulation time/min |
| Example 1 | 29.2 | 34.7 | 5.5 |
| Example 2 | 28.7 | 35.9 | 7.2 |
| Comparative example 1 | 25.2 | 36.3 | 11.1 |
| Comparative example 2 | 23.4 | 35.8 | 12.4 |
| Comparative example 3 | 26.7 | 36.9 | 10.2 |
| Comparative example 4 | 25.0 | 37.4 | 12.4 |
| Comparative example 5 | 22.3 | 36.8 | 14.5 |
| Comparative example 6 | 23.1 | 36.2 | 13.1 |
The experimental results in Table 1 show that the difference in setting time is significantly shorter in examples 1 and 2 as compared with comparative examples 1 to 6, and that it is possible to provide a faster setting speed of gypsum, thereby improving the firing effect in the actual production of gypsum. According to the microstructure scanning diagrams of example 1 and example 2 shown in fig. 3 and fig. 4, the microstructure of example 1 is more complicated than the channel structure of example 2, which shows that the retarder of example 1 can be mixed with gypsum well and release the retarding effect.
The gypsum retarders prepared in all the examples and comparative examples were added to gypsum to test the strength performance of the gypsum in the following manner: the adding ratio of the gypsum retarder is 0.2 percent of the weight of the gypsum, and the gypsum needs to be standard thickness gypsum with water consumption of 60 percent, and the breaking strength of the gypsum is respectively tested. Each sample was run in parallel 5 times with the results shown in table 2. The following conclusions can be drawn by analyzing the experimental results of table 2 and fig. 2: the flexural strength of the gypsum calcination retarder is higher in example 1 compared with that of examples 2-4 and comparative examples 1-11, which shows that the oven dry strength of the gypsum calcination retarder can be improved to the greatest extent by the proportion of the gypsum calcination retarder in example 1, the amino acid polymers of lysine, aspartic acid, glutamic acid and threonine have a synergistic effect on the setting of gypsum, and the combination can effectively improve the flexural effect of the gypsum, enhance the mechanical strength of the gypsum and prolong the service life.
TABLE 2 flexural Strength of examples 1 to 4 and comparative examples 1 to 11
| Test sample | Flexural strength (MPa) |
| Example 1 | 4.3±0.05 |
| Example 2 | 4.2±0.06 |
| Example 3 | 4.1±0.04 |
| Example 4 | 4.2±0.07 |
| Comparative example 1 | 3.8±0.09 |
| Comparative example 2 | 3.9±0.02 |
| Comparative example 3 | 3.9±0.04 |
| Comparative example 4 | 4.0±0.05 |
| Comparative example 5 | 3.9±0.05 |
| Comparative example 6 | 4.1±0.07 |
| Comparative example 7 | 4.0±0.10 |
| Comparative example 8 | 3.8±0.06 |
| Comparative example 9 | 3.7±0.05 |
| Comparative example 10 | 3.9±0.04 |
| Comparative example 11 | 3.8±0.10 |
The gypsum retarders prepared in all the examples and comparative examples were added to gypsum to test the strength performance of the gypsum in the following manner: the adding ratio of the gypsum retarder is 0.1%, 0.3% and 0.5% of the weight of the gypsum respectively, and the compression strength of the gypsum is respectively tested by selecting the standard-consistency gypsum with the water consumption of 60%. Each sample was run in parallel 5 times with the results shown in table 3. The following conclusions can be drawn by analyzing the experimental results of table 3 and fig. 1: example 1 has a greater compressive strength relative to the other examples and comparative examples, which illustrates that the formulation of example 1 can maximize the oven dry strength of the gypsum calcination retarder, and that the addition of barium sulfate and iron oxide together to the retarder can provide a higher gypsum strength. Analysis of the data in this table reveals that the set retarder composition provided by the present invention can improve the hardness and the green quality of the gypsum model.
TABLE 3 compressive strengths of examples and comparative examples
An amount of each of examples 3 and 4 and comparative examples 7 to 11 was weighed and placed in a thermostatic heating bottle containing gypsum, and the ratio of gypsum to gypsum retarder 100:0.5, adding water which is 0.5 times of the weight of the gypsum, and respectively inspecting the initial setting time and the final setting time of the gypsum, wherein the initial setting time refers to the time from the time when the gypsum powder is scattered into the water until the gypsum loses fluidity and begins to thicken under the standard thickening water consumption, and the final setting time refers to the time from the time when the gypsum powder is scattered into the water until the gypsum slurry is solidified under the standard thickening water consumption. The resulting time difference is the set time of the gypsum. The experiment was repeated five times in parallel to obtain an average, and the results are shown in Table 4.
TABLE 4 initial setting time, final setting time, setting time difference of examples 3,4 and comparative examples 7 to 11
The experimental results in table 4 show that the setting time difference of example 3 is shorter than that of other examples and comparative examples, which shows that the material ratio of example 3 can maximally accelerate the setting speed of gypsum, thereby greatly enhancing the practical applicability of gypsum.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be understood that any other changes, modifications, substitutions, combinations and simplifications which do not depart from the spirit and principles of the invention should be construed as equivalents thereof, which should be construed by those skilled in the art and are within the scope of the invention.
Claims (5)
1. A set retarder composition useful for gypsum calcination, characterized by: the gypsum retarder comprises a gypsum retarder carrier, a retarder stabilizer, a strength stabilizer and a pH regulator, wherein the gypsum retarder carrier is prepared from raw materials including lysine, aspartic acid, glutamic acid, threonine and acetic anhydride; the retarder stabilizer is prepared from raw materials including calcium metaphosphate and calcium superphosphate; the raw materials for preparing the strength stabilizer comprise barium sulfate, ferric oxide and silicon aluminide; the raw materials for preparing the pH regulator comprise cement, ash calcium, heavy calcium and light calcium;
the preparation steps of the components are as follows:
s1, a gypsum retarder carrier: weighing 200-300 parts by weight of lysine, 150-250 parts by weight of aspartic acid, 150-200 parts by weight of glutamic acid, 200-400 parts by weight of threonine and 1000-2000 parts by weight of industrial water, continuously stirring for 60-90min under the conditions of 180 ℃ and 1.1MPa, then adding 50 parts by weight of acetic anhydride, cooling to 80 ℃, continuously controlling and stirring for 30-50min, cooling to room temperature, standing and aging for 24-48h under the condition of 20-25 ℃, and obtaining a gypsum retarder carrier for later use;
s2, retarder stabilizer: weighing 50-100 parts by weight of calcium metaphosphate and 20-50 parts by weight of calcium superphosphate, adding 300 parts by weight of deionized water, uniformly stirring at 25 ℃ for 30-60min, and placing the lower-layer precipitate into a dryer to obtain a retarder stabilizer;
s3, strength stabilizer: weighing 50-80 parts by weight of barium sulfate, 10-40 parts by weight of ferric oxide, 10-40 parts by weight of silicon aluminide and 100-150 parts by weight of deionized water, adding into a reaction bottle, and stirring uniformly under the stirring condition of 25 ℃ for 100-200min to obtain a strength stabilizer;
s4, pH regulator: weighing 5-10 parts by weight of cement, 4-7 parts by weight of ash calcium, 1-5 parts by weight of heavy calcium and 0.5-1 part by weight of light calcium, and preserving heat for 2-5 hours in a constant temperature stirrer at the temperature of 40-60 ℃ to obtain a pH regulator;
homogenizing the gypsum retarder carrier, the retarder stabilizer, the strength stabilizer and the pH regulator prepared by the steps S1, S2, S3 and S4 by using solid mixing equipment, keeping the temperature at 80-120 ℃ and the pressure at 101.325KPa for 30-120min to obtain a retarder composition;
the weight ratio of the gypsum retarder carrier, the retarder stabilizer, the strength stabilizer and the pH regulator in the retarder composition is 1:1:1:1.
2. the retarder composition useful for calcining gypsum according to claim 1, wherein: 200 parts by weight of lysine, 150 parts by weight of aspartic acid, 150 parts by weight of glutamic acid, 200 parts by weight of threonine and 1000 parts by weight of industrial water are weighed in the S1.
3. A set retarder composition useful in the calcination of gypsum according to claim 1, wherein: and 50 parts by weight of calcium metaphosphate and 20 parts by weight of calcium superphosphate are weighed in the S2.
4. A set retarder composition useful in the calcination of gypsum according to claim 1, wherein: and S3, weighing 50 parts of barium sulfate, 10 parts of ferric oxide, 10 parts of silicon aluminide and 100 parts of deionized water.
5. A set retarder composition useful in the calcination of gypsum according to claim 1, wherein: and S4, weighing 5 parts of cement, 4 parts of ash calcium, 1 part of heavy calcium and 0.5 part of light calcium.
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