CN107473685B - Fluorgypsum-based plastering material for interior walls and production process thereof - Google Patents
Fluorgypsum-based plastering material for interior walls and production process thereof Download PDFInfo
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- CN107473685B CN107473685B CN201710841235.7A CN201710841235A CN107473685B CN 107473685 B CN107473685 B CN 107473685B CN 201710841235 A CN201710841235 A CN 201710841235A CN 107473685 B CN107473685 B CN 107473685B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
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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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Abstract
The invention discloses a fluorgypsum-based inner wall plastering material and a production process thereof, wherein the fluorgypsum-based inner wall plastering material comprises the following raw materials in parts by weight: 8000-10000 parts of modified fluorgypsum, 0-15000 parts of aggregate, 20-100 parts of water-retaining thickening agent and 50-250 parts of redispersible latex powder. The method takes waste fluorgypsum as a raw material, firstly carries out modification treatment on the fluorgypsum raw material, namely, the fluorgypsum raw material is subjected to low-temperature calcination treatment and is ground together with an excitant, a coagulation regulator and an expansion inhibitor, so that the modified fluorgypsum with the advantages of high hydration rate and short setting time is obtained; uniformly stirring the modified fluorgypsum, the aggregate, the water-retention thickener and the redispersible latex powder which are used as raw materials according to the weight ratio to obtain the fluorgypsum-based inner wall plastering material; the embodiment of the invention provides a utilization way of industrial waste fluorgypsum, and compared with the existing plastering material, the fluorgypsum-based inner wall plastering material prepared by utilizing the modified fluorgypsum has the advantages of high strength, stable volume, difficult cracking, low-temperature quick setting and no saltpetering.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a fluorgypsum-based plastering material for an inner wall and a production process thereof.
Background
The fluorgypsum is a byproduct in the process of preparing hydrofluoric acid by carrying out acidolysis on fluorite with sulfuric acid, the main component is type II anhydrous calcium sulfate which is strongly acidic, the pH value is 2-4, and the annual emission amount exceeds 200 million tons. At present, most of fluorgypsum in China is taken as solid waste to be stockpiled, which not only occupies land resources, but also pollutes the environment. Because natural resources are increasingly consumed, the interior wall plastering material with high added value is prepared by utilizing the waste fluorgypsum, so that the waste resources can be fully utilized, the soil and underground water environment can be protected, and the prepared interior wall plastering material is an important component in the building engineering, thereby having great significance.
At present, plastering materials adopted by building interior walls are divided into cement-based plastering and gypsum-based plastering, wherein the cement-based plastering materials are large in drying shrinkage and easy to crack, and the like, and the common gypsum-based plastering materials are β semi-hydrated gypsum-based plastering materials and anhydrous gypsum-based plastering materials, β semi-hydrated gypsum is prepared by calcining dihydrate gypsum, and the plastering materials produced by β semi-hydrated gypsum have the problems of higher cost, low strength and the like.
However, in order to increase the hydration rate and shorten the setting time of conventional anhydrous gypsum-based plastering materials, the addition of an excessive amount of an activator mainly comprising a soluble salt is often used, and the excessive addition of the activator easily causes the phenomenon of "saltpetering". Secondly, the excitation effect of the exciting agent is greatly influenced by the ambient temperature, and particularly at a low ambient temperature (about 5 ℃), the excitation effect is reduced, so that the hydration rate of the material is reduced, and the coagulation time is prolonged. In addition, the hydration rate of the anhydrous gypsum-based plastering material in the early stage is slow, so that the material still has slow hydration reaction in the later stage, thereby causing the instability of the later-stage volume of the material and even causing expansion cracking. Therefore, the existing anhydrous gypsum-based plastering material has the defects of unstable volume, easy expansion and cracking, slow hydration rate at low temperature (about 5 ℃), prolonged setting time and the like.
Disclosure of Invention
The invention aims to provide a fluorgypsum-based inner wall plastering material and a production process thereof, and aims to solve the problems of low strength, poor volume stability, easy cracking, low-temperature setting rate and the like of the existing plastering material.
In a first aspect, the invention provides a fluorgypsum-based plastering material for interior walls and a production process thereof, wherein the plastering material is prepared by mixing modified fluorgypsum, aggregate, a water-retention thickener and redispersible latex powder according to the following weight ratio:
the modified fluorgypsum: 8000-10000 parts;
the aggregate is as follows: 0-15000 parts;
the water retention thickener comprises the following components: 20-100 parts of a solvent;
the redispersible latex powder comprises: 50-250 parts of a binder;
wherein the modified fluorgypsum is prepared by calcining fluorgypsum raw material at the low temperature of 120-300 ℃, and mixing with an expansion inhibitor, an excitant and a coagulation regulator in proportion;
the weight ratio of the mixture is as follows: the fluorine gypsum raw material: the swelling inhibitor is: the exciting agent is: the setting regulator is 8000-9800: 100-1000 parts of: 50-500: 50-500;
the fluorgypsum raw material is a byproduct in the preparation of hydrofluoric acid by carrying out acidolysis on fluorite powder with sulfuric acid.
Preferably, the fineness of the modified fluorgypsum is 400-150 meshes.
Preferably, the aggregate is river sand, and the grain size of the river sand is 0.25-0.5 mm.
Preferably, the water-retaining thickener is one or more of methylcellulose, hydroxyethyl cellulose, hydroxypropyl methylcellulose and polyvinyl alcohol.
Preferably, the redispersible latex powder is an ethylene-vinyl acetate copolymer.
Preferably, the expansion inhibitor is one or more of silica fume, blast furnace slag powder and portland cement.
Preferably, the exciting agent is one or more of sodium sulfate, potassium sulfate, aluminum sulfate and aluminum potassium sulfate.
Preferably, the set adjusting agent is one or more of magnesium oxide, calcium oxide, sodium carbonate, lithium carbonate and potassium carbonate.
In a second aspect, according to an embodiment of the present invention, there is provided a process for producing a fluorgypsum-based interior wall plastering material, comprising the steps of:
calcining the fluorgypsum raw material at a low temperature of between 120 and 300 ℃;
conveying the fluorgypsum raw material subjected to the low-temperature calcination treatment to grinding equipment, adding an expansion inhibitor, an exciting agent and a coagulation regulator into the grinding equipment according to a weight ratio, and grinding the fluorgypsum raw material and the fluorgypsum raw material subjected to the low-temperature calcination treatment together to obtain modified fluorgypsum;
adding the modified fluorgypsum, the aggregate, the water-retaining thickener and the redispersible latex powder serving as raw materials into stirring equipment according to a certain weight ratio, and uniformly stirring to obtain the fluorgypsum-based inner wall plastering material;
wherein the low-temperature calcination treatment equipment is a rotary kiln, and the low-temperature calcination treatment time is 4-8 h;
the weight ratio of the fluorgypsum raw material, the expansion inhibitor, the excitant and the coagulation regulator is as follows: the fluorine gypsum raw material: the swelling inhibitor is: the exciting agent is: the setting regulator is 8000-9800: 100-1000 parts of: 50-500: 50-500;
the weight ratio of the modified fluorgypsum to the aggregate to the water-retaining thickener to the redispersible latex powder is as follows: the modified fluorgypsum: the aggregate is as follows: the water retention thickener comprises the following components: the redispersible latex powder is 8000-10000: 0-15000: 20-100: 50-250 parts of;
the grinding equipment is a ball mill, and the fineness of the modified fluorgypsum obtained after grinding is 400-150 meshes.
Preferably, the modified fluorgypsum, the aggregate, the water-retention thickener and the redispersible latex powder are used as raw materials, and the raw materials are added into a stirring device according to a certain weight ratio and stirred uniformly to obtain the fluorgypsum-based inner wall plastering material, wherein the stirring device is a double-shaft gravity-free mixer, and the stirring time is 5-10 min.
According to the technical scheme, the embodiment of the invention provides a fluorgypsum-based inner wall plastering material and a production process thereof, and the fluorgypsum-based inner wall plastering material comprises the following raw materials in parts by weight: 8000-10000 parts of modified fluorgypsum, 0-15000 parts of aggregate, 20-100 parts of water-retaining thickening agent and 50-250 parts of redispersible latex powder. In the embodiment of the invention, waste fluorgypsum is used as a raw material, and firstly, the fluorgypsum raw material is modified, namely, the fluorgypsum raw material is subjected to low-temperature calcination treatment and ground together with an exciting agent, a coagulation regulator and an expansion inhibitor, so that the defects of slow hydration rate and long setting time of the fluorgypsum are overcome, and the modified fluorgypsum with the advantages of fast hydration rate and short setting time is obtained; taking the modified fluorgypsum, the aggregate, the water-retaining thickener and the redispersible latex powder as raw materials, and respectively mixing the raw materials according to the weight ratio of 8000-10000: 0-15000: 20-100: uniformly stirring the materials in a weight ratio of 50-250 to obtain a fluorgypsum-based inner wall plastering material; wherein, the volume change of the material can be effectively controlled by adding a proper amount of the swelling inhibitor; the activator can accelerate the hydration rate of the fluorgypsum and can be matched with the coagulation regulator to shorten the setting time; the aggregate is river sand, so that the aggregate can play a role of a skeleton in the prepared plastering material for the inner wall, the volume stability of the material is favorably maintained, and the workability of the material is improved; therefore, the embodiment of the invention provides a utilization way of industrial waste fluorgypsum, wherein the fluorgypsum is used as a raw material to obtain the modified fluorgypsum through modification, and compared with the existing plastering material, the fluorgypsum-based inner wall plastering material prepared by utilizing the modified fluorgypsum has the advantages of high strength, stable volume, difficult cracking, low-temperature quick setting and no efflorescence.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a flow chart of a production process of a fluorgypsum-based plastering material for interior walls according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying 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.
In a first aspect, according to an embodiment of the present invention, there is provided a fluorgypsum-based plastering material for interior walls, which is prepared by mixing modified fluorgypsum, aggregate, a water-retaining thickener and a redispersible latex powder in the following weight ratio:
modified fluorgypsum: 8000-10000 parts; aggregate: 0-15000 parts; water retention thickener: 20-100 parts of a solvent; redispersible latex powder: 50-250 parts of a binder;
wherein the modified fluorgypsum is prepared by calcining fluorgypsum raw material at the low temperature of 120-300 ℃, and mixing with an expansion inhibitor, an excitant and a coagulation regulator in proportion; the weight ratio of the mixture is as follows: fluorine gypsum raw material: swelling inhibitor: exciting agent: the setting regulator is 8000-9800: 100-1000 parts of: 50-500: 50-500; the fluorgypsum raw material is a byproduct in the preparation of hydrofluoric acid by carrying out acidolysis on fluorite powder with sulfuric acid.
The fluorgypsum raw material used in the embodiment of the invention is a byproduct in preparing hydrofluoric acid by acidolysis of fluorite powder with sulfuric acid, and the main chemical component of the fluorgypsum raw material is type II anhydrous calcium sulfate and also contains a small amount of CaF2(content: 2% to 5%), residual sulfuric acid, and the like. The fluorgypsum immediately after production is strongly acidic (pH 2-4).
Under natural conditions, the hydration rate of the fluorgypsum is slow, and the setting time is long, so that when the fluorgypsum is used for preparing the plastering material for the inner wall, the fluorgypsum raw material needs to be modified, the hydration rate is accelerated when the fluorgypsum is used for preparing the plastering material for the inner wall, and the setting time is shortened. Wherein the modification treatment process specifically comprises the following steps:
firstly, conveying the fluorgypsum raw material to a rotary kiln by a belt conveyor for low-temperature calcination, wherein the calcination temperature is 120-300 ℃, and the calcination time is 4-8 h.
The aim of low-temperature calcination of the fluorgypsum raw material is to activate the fluorgypsum, defects and distortion are formed on the surface of the fluorgypsum through low-temperature calcination, the internal structure of the fluorgypsum is relaxed, the internal stress field and strain energy of lattices are increased, and the activity of the fluorgypsum is further improved.
Secondly, conveying the fluorgypsum raw material subjected to low-temperature heat treatment into grinding equipment for grinding treatment, adding an expansion inhibitor, an exciting agent and a set regulating agent into the grinding equipment, grinding the materials together with the fluorgypsum raw material subjected to low-temperature heat treatment to obtain modified fluorgypsum, and adding the three modifier materials to overcome the defects of the fluorgypsum raw material.
The modified fluorgypsum prepared by grinding can be conveyed into a storage bin through a screw conveyor and a lifter in sequence for use in the subsequent production process.
When the powder is ground together with the fluorine gypsum raw material after heat treatment, the expansion inhibitor, the excitant and the coagulation regulator are added according to the weight ratio of the fluorine gypsum raw material, and the method specifically comprises the following steps: fluorine gypsum raw material: swelling inhibitor: exciting agent: the setting regulator is 8000-9800: 100-1000 parts of: 50-500: 50 to 500.
Wherein, the expansion inhibitor has the following functions when the fluorgypsum raw material is modified: the volume stability of the plastering material is ensured, the ineffective expansion is reduced, and the cracking caused by the ineffective expansion is avoided. The expansion inhibitor applied in the embodiment of the invention is one or more of silica fume, blast furnace slag powder and portland cement.
The function of the coagulation regulator in modification treatment of the fluorgypsum raw material is as follows: the setting time of the plastering material is adjusted, especially the setting speed of the plastering material under the low temperature condition is ensured, and the construction efficiency is improved. The pour point regulator applied in the embodiment of the invention is one or more of alkaline earth metal oxide and carbonate compounds, and specifically is one or more of magnesium oxide, calcium oxide, sodium carbonate, lithium carbonate, potassium carbonate and the like.
The effect of the excitant in the modification treatment of the fluorgypsum raw material is as follows: the hydration rate of the fluorgypsum is accelerated, and the setting time is shortened, but because the excitation effect of the exciting agent is influenced by the ambient temperature, the hydration rate is slowed down at a lower temperature, and the setting time is prolonged, the exciting agent is matched with the setting regulator for use, so that the stability of the setting time can be ensured. The exciting agent applied in the embodiment of the invention is one or more of sodium sulfate, potassium sulfate, aluminum sulfate and aluminum potassium sulfate.
Because the prepared plastering material is easy to generate the phenomenon of saltpetering when the excitant is added in a large amount, the weight of the excitant relative to the content of the fluorine gypsum raw material is small in the embodiment of the invention, the phenomenon of saltpetering is avoided, the effect of the excitant on improving the hydration rate and the setting time is not influenced, and the addition range of the excitant provided by the embodiment of the invention is most suitable.
The grinding equipment during grinding treatment can be a ball mill, and the fineness of the modified fluorgypsum after grinding treatment is kept within the range of 150 meshes to 400 meshes.
The fineness of the modified fluorgypsum is kept between 400 and 150 meshes, so that the larger specific surface area of the fluorgypsum can be ensured to be contacted with water for hydration reaction, the hydration rate is improved, and a better water-cement ratio can be controlled during construction and use to ensure the strength of the material. If the fineness of the modified fluorgypsum is too fine, the mechanical property and the strength of the material are influenced when the water-cement ratio of the plastering material is too high.
The fluorgypsum-based inner wall plastering material can be obtained by taking the modified fluorgypsum obtained by modifying the fluorgypsum raw material as the raw material, adding materials such as aggregate, a water-retention thickening agent, redispersible latex powder and the like, and uniformly stirring according to a certain weight ratio.
Wherein the weight ratio of the modified fluorgypsum to the aggregate to the water-retaining thickener to the redispersible latex powder is as follows: modified fluorgypsum: aggregate: water retention thickener: the redispersible latex powder is 8000-10000: 0-15000: 20-100: 50 to 250.
In the embodiment of the invention, the content of the modified fluorgypsum is 8000-10000 (weight ratio), if the content of the modified fluorgypsum in the raw material mixture for preparing the fluorgypsum-based inner wall plastering material is too high, more expansion inhibitors are required to be added in the production process to control the volume change of the plastering material, and the excessive addition of the expansion inhibitors can cause the phenomenon of excessive alkali of the material; if the content of the modified fluorgypsum is too small, the flexural strength and the compressive strength of the plastering material are affected. Therefore, the addition range of the modified fluorgypsum provided by the embodiment of the invention is optimal, and the modified fluorgypsum with corresponding content is added into the raw materials according to the addition range, so that excessive expansion inhibitor is not required to be added in the process of preparing the fluorgypsum-based inner wall plastering material to control the volume change of the fluorgypsum-based inner wall plastering material, and the breaking strength and the compressive strength of the plastering material can be optimal.
In the embodiment of the invention, the aggregate is medium sand, specifically river sand, the fineness modulus of the medium sand is 2.3-3.0, and the average particle size of the medium sand is 0.25-0.5 mm, so that the use requirement of GB/T14684 plus 2011 building sand on the medium sand is met.
In the embodiment, the medium sand is used as the aggregate, so that the aggregate can play a role of a skeleton in the prepared plastering material for the inner wall, the volume stability of the material is favorably maintained, and the workability of the material can be improved; if fine sand is used, the water requirement is large when the plastering material is actually applied, and the development of the strength of the material is not facilitated; and the adoption of coarse sand is not favorable for flattening the folded surface and has the risk of falling. Therefore, the embodiment of the invention adopts the medium sand as the aggregate as the best choice.
In the embodiment of the invention, aggregate can be added or not added in the raw materials for preparing the fluorgypsum-based inner wall plastering material. When the aggregate is added into the raw materials, the prepared fluorgypsum-based plastering material for the inner wall can be used as a plastering material for the bottom layer of the inner wall and is applied to the bottom layer plastering of the inner wall of a building; when the raw materials are not added with aggregate, the prepared fluorgypsum-based plastering material for the inner wall can be used as a plastering material for the surface layer of the inner wall and is applied to plastering of the surface layer of the inner wall of a building. During actual preparation, the corresponding fluorgypsum-based plastering material for the inner wall can be prepared according to construction requirements and adjusted by adding or not adding aggregate in the raw materials.
Typically, the aggregate used is stored in storage bins for use in subsequent manufacturing processes.
When the process for preparing the inner wall plastering material is carried out, the modified fluorgypsum stored in the storage bin is weighed according to the proportion and is conveyed into the stirrer through the screw conveyor.
Meanwhile, the aggregate, the water-retaining thickener and the redispersible latex powder are weighed according to the proportion and put into a stirrer, and the four raw materials are fully stirred and uniformly mixed to obtain the fluorgypsum-based inner wall plastering material.
Because the addition amounts of the water-retaining thickener and the redispersible latex powder are relatively small, the water-retaining thickener and the redispersible latex powder need to be premixed before being put into a stirrer, so that the uniform mixing of the water-retaining thickener and the redispersible latex powder is ensured.
The reason for using the water-retaining thickener as one of the raw materials is: the water-retaining thickener can improve the water-retaining property of the plastering material of the inner wall, and prevent the phenomena of too fast water loss, too fast hardening, drying and cracking in the construction process. In the embodiment of the invention, the water-retaining thickener is one or more of methyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, polyvinyl alcohol and the like.
The reason why the redispersible emulsion powder is used as one of the raw materials is as follows: is favorable for improving the performances of the material such as adhesive property, breaking strength, water resistance and the like. In the embodiment of the invention, the redispersible latex powder is an ethylene-vinyl acetate copolymer.
The stirrer used in the embodiment of the invention is a double-shaft gravity-free mixer, and the stirring time is 5-10 min. The stirring time in actual production can be determined according to actual conditions, so as to stir the mixture fully and uniformly, and is not limited to the above time.
The final product obtained by uniformly stirring is powdery inner wall plastering material, and when the raw materials are added with aggregate, the granularity range of the prepared inner wall plastering material is 400-30 meshes; when no aggregate is added in the raw materials, the granularity of the prepared inner wall plastering material is 400-150 meshes.
The prepared fluorgypsum-based inner wall plastering material is packaged and then stacked for storage, so that the fluorgypsum-based inner wall plastering material can be taken and used immediately during construction.
In the process of preparing the fluorgypsum-based inner wall plastering material, the embodiment of the invention is provided with the dust removing equipment in the process of modifying the fluorgypsum raw material, preparing the modified fluorgypsum through grinding and in the process of packaging the prepared final product fluorgypsum-based inner wall plastering material, so that the process of the production technology is in a dust-free environment, the body of a worker is not influenced by the dust environment, and the health of the worker is not harmed.
The application method of the fluorgypsum-based inner wall plastering material provided by the embodiment of the invention comprises the following steps: during construction, the inner wall plastering material is mixed with water according to different proportions, and the mixture is stirred uniformly and then stands for 5-8 min to obtain the inner wall plastering mortar for construction.
In a second aspect, as shown in fig. 1, there is provided a process for producing a fluorgypsum-based interior wall plastering material according to an embodiment of the present invention, comprising the steps of:
calcining the fluorgypsum raw material at a low temperature of between 120 and 300 ℃;
conveying the fluorgypsum raw material subjected to the low-temperature calcination treatment to grinding equipment, adding an expansion inhibitor, an exciting agent and a coagulation regulator into the grinding equipment according to a weight ratio, and grinding the fluorgypsum raw material and the fluorgypsum raw material subjected to the low-temperature calcination treatment together to obtain modified fluorgypsum;
adding the modified fluorgypsum, the aggregate, the water-retaining thickener and the redispersible latex powder serving as raw materials into stirring equipment according to a certain weight ratio, and uniformly stirring to obtain the fluorgypsum-based inner wall plastering material;
wherein the low-temperature calcination treatment equipment is a rotary kiln, and the low-temperature calcination treatment time is 4-8 h;
the weight ratio of the fluorgypsum raw material, the expansion inhibitor, the excitant and the coagulation regulator is as follows: the fluorine gypsum raw material: the swelling inhibitor is: the exciting agent is: the setting regulator is 8000-9800: 100-1000 parts of: 50-500: 50-500;
the weight ratio of the modified fluorgypsum to the aggregate to the water-retaining thickener to the redispersible latex powder is as follows: the modified fluorgypsum: the aggregate is as follows: the water retention thickener comprises the following components: the redispersible latex powder is 8000-10000: 0-15000: 20-100: 50-250 parts of;
the grinding equipment is a ball mill, and the fineness of the modified fluorgypsum obtained after grinding is 400-150 meshes.
Preferably, the modified fluorgypsum, the aggregate, the water retention thickener and the redispersible latex powder are taken as raw materials, and are added into stirring equipment according to a certain weight ratio to be uniformly stirred, so that the fluorgypsum-based inner wall plastering material is obtained, wherein the stirring equipment is a gravity-free mixer, and the stirring time is 5-10 min.
The specific implementation process of the production process provided by the embodiment of the present invention may refer to the description of the first aspect of the embodiment of the present invention, and is not described herein again.
According to the technical scheme, the embodiment of the invention provides a fluorgypsum-based inner wall plastering material and a production process thereof, and the fluorgypsum-based inner wall plastering material comprises the following raw materials in parts by weight: 8000-10000 parts of modified fluorgypsum, 0-15000 parts of aggregate, 20-100 parts of water-retaining thickening agent and 50-250 parts of redispersible latex powder. According to the embodiment of the invention, waste fluorgypsum is used as a raw material, firstly, the fluorgypsum raw material is modified, and is subjected to low-temperature calcination treatment and grinding treatment together with an exciting agent, a coagulation regulator and an expansion inhibitor, so that the defects of slow hydration rate and long setting time of the fluorgypsum are overcome, and the modified fluorgypsum with the advantages of fast hydration rate and short setting time is obtained; taking the modified fluorgypsum, the aggregate, the water-retaining thickener and the redispersible latex powder as raw materials, and respectively mixing the raw materials according to the weight ratio of 8000-10000: 0-15000: 20-100: uniformly stirring the materials in a weight ratio of 50-250 to obtain a fluorgypsum-based inner wall plastering material; wherein, the volume change of the material can be effectively controlled by adding a proper amount of the swelling inhibitor; the activator can accelerate the hydration rate of the fluorgypsum and can be matched with the coagulation regulator to shorten the setting time; the aggregate is river sand, so that the aggregate can play a role of a skeleton in the prepared plastering material for the inner wall, the volume stability of the material is favorably maintained, and the workability of the material is improved; therefore, the embodiment of the invention provides a utilization way of industrial waste fluorgypsum, wherein the fluorgypsum is used as a raw material to obtain the modified fluorgypsum through modification, and the fluorgypsum-based inner wall plastering material prepared by utilizing the modified fluorgypsum has the advantages of high strength, stable volume, low-temperature quick setting and no saltpetering compared with the existing plastering material.
The technical solution disclosed in the embodiments of the present invention is described below with reference to specific embodiments, and the process for preparing a fluorgypsum-based interior wall plastering material is described with reference to the first and second aspects of the present invention, wherein the test temperature of each embodiment is 5 ℃.
Example one
The fluorgypsum-based inner wall plastering material prepared by the embodiment of the invention is prepared by uniformly mixing the following components in percentage by weight: 8800 parts of fluorgypsum raw material, 800 parts of expansion inhibitor, 200 parts of excitant, 200 parts of thickening time regulator, 0 part of aggregate, 20 parts of water-retaining thickener and 50 parts of redispersible latex powder.
Firstly, carrying out low-temperature heat treatment on a fluorgypsum raw material, then grinding the fluorgypsum raw material together with an expansion inhibitor, an excitant and a setting regulator to obtain modified fluorgypsum, and finally uniformly stirring the modified fluorgypsum, aggregate, a water-retaining thickener and redispersible latex powder to obtain the fluorgypsum-based inner wall plastering material.
During construction, the fluorgypsum-based inner wall plastering material is added with water according to the water cement ratio of 0.35 and stirred uniformly to obtain the fluorgypsum-based inner wall plastering mortar, and the technical performance test results are shown in table 1.
Table 1 example one technical performance test results
As can be seen from the above Table 1, the fluorgypsum-based plastering material for interior walls prepared by the formulation has no aggregate added in the raw material formulation, so that the plastering material can be applied to plastering of surface layers of interior walls of buildings. Compared with the requirement of GB/T28627-2012 plastering gypsum on a surface layer plastering material, the detection result of the performances is better; as the GB/T28627-2012 plastering gypsum does not have a requirement on the 28-day size change rate of the plastering material, compared with JG/T291-2011 masonry and plastering dry-mixed mortar for buildings, the GB/T28627-plastering gypsum has the advantages of small 28-day size change rate and good volume stability, and avoids cracking caused by ineffective expansion of the material. Therefore, the plastering material can be used as plastering material for inner wall surface course and applied to surface course plastering of building inner walls.
Example two
The fluorgypsum-based inner wall plastering material prepared by the embodiment of the invention is prepared by uniformly mixing the following components in percentage by weight: 8600 parts of fluorgypsum raw material, 300 parts of swelling inhibitor, 150 parts of excitant, 250 parts of coagulation regulator, 5000 parts of aggregate, 50 parts of water-retaining thickener and 100 parts of redispersible latex powder.
Firstly, carrying out low-temperature heat treatment on a fluorgypsum raw material, then grinding the fluorgypsum raw material together with an expansion inhibitor, an excitant and a setting regulator to obtain modified fluorgypsum, and finally uniformly stirring the modified fluorgypsum, aggregate, a water-retaining thickener and redispersible latex powder to obtain the fluorgypsum-based inner wall plastering material.
During construction, the fluorgypsum-based inner wall plastering material is added with water according to the water cement ratio of 0.29 and stirred uniformly to obtain the fluorgypsum-based inner wall plastering mortar, and the technical performance test results are shown in table 2.
Table 2 results of technical performance test of example two
As can be seen from the above Table 2, the raw material formulation of the prepared fluorgypsum-based plastering material for interior walls is added with aggregate, so that the plastering material can be applied to the bottom plastering of interior walls of buildings. Compared with the requirement on the bottom layer plastering material in GB/T28627-2012 plastering gypsum, the detection result of the performances is better. As the GB/T28627-2012 plastering gypsum does not have a requirement on the 28-day size change rate of the plastering material, compared with JG/T291-2011 masonry and plastering dry-mixed mortar for buildings, the GB/T28627-plastering gypsum has the advantages of small 28-day size change rate and good volume stability, and avoids cracking caused by ineffective expansion of the material. Therefore, the plastering material can be used as plastering material for the bottom layer of the inner wall and applied to plastering of the bottom layer of the inner wall of a building.
EXAMPLE III
The fluorgypsum-based inner wall plastering material prepared by the embodiment of the invention is prepared by uniformly mixing the following components in percentage by weight: 8000 parts of fluorgypsum raw material, 150 parts of expansion inhibitor, 200 parts of fluorgypsum excitant, 400 parts of coagulation regulator, 12000 parts of aggregate, 80 parts of water-retaining thickener and 200 parts of redispersible latex powder.
Firstly, carrying out low-temperature heat treatment on a fluorgypsum raw material, then grinding the fluorgypsum raw material together with an expansion inhibitor, an excitant and a setting regulator to obtain modified fluorgypsum, and finally uniformly stirring the modified fluorgypsum, aggregate, a water-retaining thickener and redispersible latex powder to obtain the fluorgypsum-based inner wall plastering material.
During construction, the fluorgypsum-based inner wall plastering material is added with water according to the water cement ratio of 0.23 and stirred uniformly to obtain the fluorgypsum-based inner wall plastering mortar, and the technical performance test results are shown in table 3.
Table 3 results of the three technical performance tests of the example
As can be seen from the above Table 3, the raw material formulation of the prepared fluorgypsum-based plastering material for interior walls is added with aggregate, so that the plastering material can be applied to the bottom plastering of interior walls of buildings. Compared with the requirement on the bottom layer plastering material in GB/T28627-2012 plastering gypsum, the detection result of the performances is better. As the GB/T28627-2012 plastering gypsum does not have a requirement on the 28-day size change rate of the size of the plastering material, compared with the JG/T291-2011 masonry and plastering dry-mixed mortar for buildings, the 28-day size change rate is small, the volume stability is good, and cracking caused by ineffective expansion of the material is avoided. Therefore, the plastering material can be used as plastering material for the bottom layer of the inner wall and applied to plastering of the bottom layer of the inner wall of a building.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (3)
1. The fluorgypsum-based inner wall plastering material is characterized by being prepared by mixing modified fluorgypsum, aggregate, a water-retention thickener and redispersible latex powder according to the following weight ratio:
the modified fluorgypsum is prepared by calcining a fluorgypsum raw material at the low temperature of 120-300 ℃, and mixing the calcined fluorgypsum raw material with an expansion inhibitor, an exciting agent and a coagulation regulator in proportion, wherein the fineness of the modified fluorgypsum is 400-150 meshes;
the weight ratio of the mixture is as follows: the fluorine gypsum raw material: the swelling inhibitor is: the exciting agent is: the setting regulator is 8000-9800: 100-1000 parts of: 50-500: 50-500, the fluorgypsum raw material is a by-product generated in the process of preparing hydrofluoric acid by carrying out acidolysis on fluorite powder with sulfuric acid, the expansion inhibitor is one or more of silica fume, blast furnace slag powder and portland cement, the excitant is one or more of sodium sulfate, potassium sulfate, aluminum sulfate and potassium aluminum sulfate, and the coagulation regulator is one or more of magnesium oxide, calcium oxide, sodium carbonate, lithium carbonate and potassium carbonate;
the aggregate is river sand, and the particle size of the river sand is 0.25-0.5 mm;
the water-retaining thickener is one or more of methyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose and polyvinyl alcohol;
the redispersible latex powder is a copolymer of ethylene and vinyl acetate.
2. A process for the production of a fluorgypsum-based interior wall plastering material as claimed in claim 1, comprising the steps of:
calcining the fluorgypsum raw material at a low temperature of between 120 and 300 ℃;
conveying the fluorgypsum raw material subjected to the low-temperature calcination treatment to grinding equipment, adding an expansion inhibitor, an exciting agent and a coagulation regulator into the grinding equipment according to a weight ratio, and grinding the fluorgypsum raw material and the fluorgypsum raw material subjected to the low-temperature calcination treatment together to obtain modified fluorgypsum;
adding the modified fluorgypsum, the aggregate, the water-retaining thickener and the redispersible latex powder serving as raw materials into stirring equipment according to a certain weight ratio, and uniformly stirring to obtain the fluorgypsum-based inner wall plastering material;
wherein the low-temperature calcination treatment equipment is a rotary kiln, and the low-temperature calcination treatment time is 4-8 h;
the weight ratio of the fluorgypsum raw material, the expansion inhibitor, the excitant and the coagulation regulator is as follows: the fluorine gypsum raw material: the swelling inhibitor is: the exciting agent is: the setting regulator is 8000-9800: 100-1000 parts of: 50-500: 50-500;
the weight ratio of the modified fluorgypsum to the aggregate to the water-retaining thickener to the redispersible latex powder is as follows: the modified fluorgypsum: the aggregate is as follows: the water retention thickener comprises the following components: the redispersible latex powder is 8000-10000: 0-15000: 20-100: 50-250 parts of;
the grinding equipment is a ball mill, and the fineness of the modified fluorgypsum obtained after grinding is 400-150 meshes.
3. The production process of the fluorgypsum-based inner wall plastering material of claim 2, wherein the modified fluorgypsum, the aggregate, the water-retaining thickener and the redispersible latex powder are used as raw materials, and are added into a stirring device according to a certain weight ratio to be uniformly stirred to obtain the fluorgypsum-based inner wall plastering material,
the stirring equipment is a double-shaft gravity-free mixer, and the stirring time is 5-10 min.
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| CN109354477A (en) * | 2018-12-11 | 2019-02-19 | 湖南昌迅科技环保股份有限公司 | A kind of fluorite cream base lightweight plastering mortar and preparation method thereof |
| CN110526662A (en) * | 2019-09-20 | 2019-12-03 | 贵州西奥建筑节能科技有限公司 | A kind of high intensity ardealite plastering mortar |
| MX2020002089A (en) * | 2020-02-24 | 2021-08-25 | Productos Constructivos Anhix S A De C V | Improved stable compositions based on type ii synthetic anhydrite, selected additives of needle growth activating agents regulating the initial setting time and selected additives of needle hardening agents regulating the final setting, generating a cement for manufacturing construction units and mortars, manufacturing processes, and uses thereof. |
| CN112250405A (en) * | 2020-10-15 | 2021-01-22 | 江苏一夫科技股份有限公司 | Fluorgypsum-based plastering material and preparation method and application thereof |
| CN112777993B (en) * | 2021-01-11 | 2022-10-04 | 湖北工业大学 | Heat-preservation foaming plastering gypsum based on fluorgypsum and preparation method thereof |
| CN114853433B (en) * | 2022-04-13 | 2023-04-25 | 锦洋高新材料股份有限公司 | Fluorine gypsum composite cementing material and preparation method thereof |
| CN114890699B (en) * | 2022-06-10 | 2023-10-03 | 四川方大新型建材科技开发有限责任公司 | Cementing material prepared from fluorogypsum and preparation method thereof |
| CN114890765B (en) * | 2022-06-10 | 2023-10-03 | 四川方大新型建材科技开发有限责任公司 | Plastering gypsum and preparation method thereof |
| CN115073112B (en) * | 2022-06-10 | 2023-06-30 | 四川方大新型建材科技开发有限责任公司 | Gypsum-based self-leveling mortar and preparation method thereof |
| CN115124266A (en) * | 2022-08-08 | 2022-09-30 | 锦洋高新材料股份有限公司 | Method for preparing fluorgypsum cementing material by grinding fluorgypsum |
| CN115893965A (en) * | 2022-11-17 | 2023-04-04 | 陕西碧波环保科技有限公司 | Preparation process of building material produced by utilizing delayed coagulation characteristic of fluorgypsum |
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