Production method of environment-friendly light calcium silicate board

Abstract

The present application relates to the technical field of calcium silicate board, and discloses a production method of an environmentally-friendly light calcium silicate board, which comprises the following raw materials: fly ash, cement, slaked lime, a reinforcing component, inorganic modified filler and water; wherein the reinforcing component is bamboo fiber grafted with sodium 1-naphthol-3,6-disulfonate on the surface; the bamboo fiber and sulfonic acid groups in the reinforcing component can effectively improve the bending strength of the calcium silicate board; the inorganic modified filler is obtained by inserting a polymer with a large number of quaternary ammonium salts and carboxyl groups into the interlayer of a cumengite, thereby enhancing the compactness of the calcium silicate board and further improving the strength of the calcium silicate board. Through the synergistic effect of the raw materials, the strength of the calcium silicate board is significantly improved, thereby prolonging the service life of the calcium silicate board and effectively improving the application effect of the calcium silicate board in various fields.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of calcium silicate board, and particularly relates to a production method of an environmentally-friendly light calcium silicate board. BACKGROUND

[0002] The calcium silicate board is a kind of light board made of siliceous material, calcareous material, reinforcing fiber and the like as main raw materials through processes such as slurry preparation, molding, pre-curing, autoclave curing and drying treatment, and has excellent properties such as moisture resistance, moth resistance, fire resistance, sound insulation and strong processability, and is widely used in fields such as ceiling, wall, floor, furniture, ship cabin, composite wallboard panel and the like.

[0003] With the continuous progress of science and technology and the continuous expansion of application fields, the traditional calcium silicate board has been difficult to meet the diversified and high value-added market demand, and therefore, the improvement of the performance of the calcium silicate board has become an important trend in the industry development. In order to increase the strength of the calcium silicate board, the conventional method is to add reinforcing materials, and the reinforcing fiber is the main reinforcing material of the calcium silicate board. The traditional calcium silicate board production raw material contains asbestos fiber, which is not conducive to human health and may cause health problems such as cancer. Compared with the traditional calcium silicate board, the ordinary calcium silicate board has good environmental protection performance, but the ordinary calcium silicate board mostly uses paper pulp as the reinforcing fiber. However, the paper pulp has limited effect on the strength improvement of the calcium silicate board, and cannot meet the use requirements in special fields (such as tunnel, subway engineering and the like). Therefore, it has important practical significance to prepare an environmentally-friendly light high-strength calcium silicate board.

[0004] In the prior art, the optimization of the base material is one of the main ways to improve the strength of the calcium silicate board. For example, the patent for invention with publication number CN117263634B discloses a preparation method of a calcium silicate board and a calcium silicate. In the application, lime slag, fly ash and water reducing agent are used as slurry A, and waste rubber, coal gangue, fiber and grinding aid are used as slurry B. The addition of waste rubber and coal gangue as components of the slurry can significantly improve the strength of the calcium silicate board. The grinding aid is triisopropanolamine, disodium hydroxyethylidene diphosphonate and polyacrylate, which makes the grinding of the slurry B more uniform, reduces the crack rate of the calcium silicate board and further improves the strength of the calcium silicate board. The fiber is a combination of polyethylene fiber and aramid fiber, which further improves the strength of the calcium silicate board. Therefore, the calcium silicate board can be modified by preparing a filling component with high strength to obtain a high-strength calcium silicate board. SUMMARY

[0005] In order to solve the problems mentioned in the background, the purpose of the present application is to provide a production method of an environmentally-friendly light calcium silicate board.

[0006] The purpose of the present application can be achieved by the following technical solutions.

[0007] A production method of an environment-friendly light calcium silicate board, the calcium silicate board comprising the following raw materials by weight: 40-60 parts of fly ash, 30-50 parts of cement, 4-6 parts of slaked lime, 8-10 parts of a reinforcing component, 5-7 parts of inorganic modified filler, and 100-200 parts of water;

[0008] The production method comprises the following steps:

[0009] (1) mixing the fly ash, cement, slaked lime, reinforcing component, inorganic modified filler, and water, stirring at a stirring rate of 600-800 r / min for 4-8 h to obtain a mixed slurry;

[0010] (2) pouring the mixed slurry into a mold, and then using a cold press to apply a pressure of 20-40 MPa for pressing, the pressure being kept constant during the pressing process, and the duration being 30-50 min to ensure that the slurry is fully solidified, and then performing demolding to obtain a green board;

[0011] (3) cutting the green board into products of a required specification, and then performing pre-curing, autoclave curing, and drying to obtain the environment-friendly light calcium silicate board.

[0012] Further, in step (3), the pre-curing process is pre-curing for 10-20 h in an environment with a pre-curing temperature of 50-60 ℃ and a humidity of 60-80%.

[0013] Further, the preparation method of the reinforcing component comprises the following steps:

[0014] A1: placing bamboo fibers in a potassium hydroxide solution, oscillating at a temperature of 40-50 ℃ and a rotation speed of 100-200 r / min for 1-2 h, and then performing washing and drying to obtain alkali-treated bamboo fibers;

[0015] A2: adding the alkali-treated bamboo fibers and N-methyl pyrrolidone into a reactor, ultrasonically forming a uniform suspension, discharging air after nitrogen is introduced, then adding bromoacetic acid and a catalyst into the suspension, increasing the temperature of the system to 105-115 ℃ under stirring, and performing heat preservation for 3-5 h, and then centrifugally separating the solid material, washing the solid material, and vacuum drying to obtain modified bamboo fibers;

[0016] A3: adding the modified bamboo fibers and dimethyl sulfoxide solution into a reactor under nitrogen protection, magnetically stirring to be uniform, continuously adding 1-naphthol-3,6-disulfonic acid sodium and an accelerator into the reactor, stirring after uniform mixing, increasing the temperature of the system to 70-80 ℃, and performing heat preservation and stirring for 4-6 h, discharging, washing, and drying to obtain the reinforcing component.

[0017] Further, in step A1, the mass fraction of the potassium hydroxide solution is 10%-40%.

[0018] Further, in step A2, the catalyst is any one of tetraethyl titanate, tetrabutyl titanate or tetraisopropyl titanate.

[0019] Further, in step A3, the promoter is any one of sodium carbonate, potassium carbonate or sodium bicarbonate.

[0020] Further, the preparation method of the inorganic modified filler comprises the following steps:

[0021] AA1: under nitrogen protection, N,N,N',N'-tetramethyl ethylenediamine is added to N,N-dimethyl formamide and ultrasonic dispersion is carried out for 15-25 min, then a chlorine source is added, after addition, heating is started, after the system temperature reaches 60-70℃, constant temperature stirring is carried out for 4-8 h, temperature is lowered and the material is discharged, and the intermediate material is obtained;

[0022] AA2: attapulgite is ultrasonic dispersed in deionized water to form a dispersion liquid, the intermediate material is added to the dispersion liquid, after addition, stirring is carried out at a temperature of 65-75℃ for 2-6 h, the material is filtered, a solid sample is taken, the sample is washed with deionized water, dried, and the inorganic modified filler is obtained.

[0023] Further, in step AA1, the chlorine is any one of 2,6-dichlorobenzoic acid or dichloroacetic acid.

[0024] Further, in step AA2, the average particle size of the attapulgite is 5 μm.

[0025] Advantages of the present application:

[0026] (1) The calcium silicate board prepared by the present application takes fly ash, cement, slaked lime, reinforcing components and inorganic modified filler as main raw materials, through the synergistic effect of the raw materials, the strength of the calcium silicate board is significantly improved, thereby prolonging the service life of the calcium silicate board, and the calcium silicate board has the advantages of light weight, environmental protection, etc., and has a wide application prospect.

[0027] (2) The prepared reinforcing component of the application is a bamboo fiber with 1-naphthol-3,6-disulfonic acid sodium grafted on the surface, on the one hand, the bamboo fiber is used to replace the traditional asbestos fiber, which is non-toxic, friendly to human body and environment, and has high strength, so that the strength of the calcium silicate board can be effectively improved, on the other hand, the sulfonic acid groups contained in the structure of the reinforcing component can react with calcium hydroxide in the mixed slurry, so that the cement particles are tightly adsorbed on the surface of the bamboo fiber, thereby increasing the adhesion between the reinforcing component and the mixed slurry, improving the microstructure of the mixed slurry, and making the reinforcing component better compensate for the hydration network defects of the mixed slurry, so as to further improve the bending strength of the calcium silicate board, in addition, the sulfonic acid groups can effectively absorb and retain a large amount of water in the slurry due to their hydrophilic properties, which can not only improve the water retention capacity of the slurry, but also slow down the hydration rate of the slurry, preventing the calcium silicate board from having problems such as strength decrease and cracking caused by too fast hydration process.

[0028] (3) The inorganic modified filler prepared by taking attapulgite as a base body has increased interlayer spacing and water absorption rate after intercalation modification, which is beneficial to internal hydration of the slurry and enhances the compactness of the calcium silicate board, thereby enhancing the compressive strength of the calcium silicate board, wherein a large amount of carboxyl groups contained in the inorganic modified filler can react with calcium ions in the slurry to generate insoluble calcium salt, thereby delaying the hydration degree of the slurry and improving the compactness of the calcium silicate board, in addition, quaternary ammonium ions in the inorganic modified filler can exchange with calcium ions in the slurry, thereby significantly improving the fluidity of the slurry, better filling the gaps and reducing the frequency of voids in the slurry, and synergistically enhancing the strength of the calcium silicate board with the carboxyl groups.

[0029] Of course, it is not necessary for any product implementing the present application to achieve all the advantages mentioned above. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed for the embodiment description will be briefly introduced as follows, and obviously, the drawings in the following description can only be some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0031] Figure 1 The infrared spectrum test diagram of the reinforcing component prepared by the present application.

[0032] Figure 2 The infrared spectrum test diagram of the inorganic modified filler prepared by the present application. DETAILED DESCRIPTION

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1.

[0035] I. Preparation of reinforcing components

[0036] A1: Place 5g of bamboo fiber in a 10% potassium hydroxide solution and shake for 1.5h at 45℃ and 150r / min. After washing and drying, alkalized bamboo fiber is obtained.

[0037] A2: Add 5g of alkalized bamboo fiber and N-methylpyrrolidone to the reactor, sonicate until a uniform suspension is formed, purge with nitrogen to remove air, then add 1.2g of bromoacetic acid and 0.08g of tetraethyl titanate to the suspension. Under stirring conditions, raise the system temperature to 110℃ and keep it at that temperature for 4 hours. After the material cools naturally, centrifuge to separate the solid material, wash the solid material, and vacuum dry it to obtain modified bamboo fiber.

[0038] A3: Add 5g of modified bamboo fiber and dimethyl sulfoxide solution to a nitrogen-protected reactor and stir magnetically until homogeneous. Then, add 1.6g of sodium 1-naphthol-3,6-disulfonate and 0.1g of potassium carbonate to the reactor and stir until homogeneous. Raise the system temperature to 75℃, keep it warm and stir for 5 hours, then discharge, wash, and dry to obtain the reinforcing component.

[0039] Infrared spectral analysis of the reinforcing components was performed using a Nicolet 170sx Fourier transform infrared spectrometer (USA). Figure 1 As shown, by Figure 1 It can be seen that in the infrared spectrum of the reinforcing component, 1741 cm⁻¹ -1 The characteristic absorption peak of the ester group C=O appears at 1079 cm⁻¹. -1 The characteristic absorption peak of the ether bond COC appears at 1281 cm⁻¹. -1 and 1038cm -1 The characteristic absorption peak of the sulfonic acid group appears at the location.

[0040] Technical Principle: In the reinforcing component, firstly, the bamboo fiber is subjected to alkalization pretreatment to remove lipid substances attached to its surface, obtaining alkalized bamboo fiber; secondly, under the action of tetraethyl titanate, the hydroxyl groups on the surface of the alkalized bamboo fiber undergo esterification with the carboxyl groups in the bromoacetic acid structure, modifying the surface of the bamboo fiber with halogen functional groups, thus obtaining modified bamboo fiber; then, under the action of potassium carbonate, the halogen functional groups on the surface of the modified bamboo fiber and the hydroxyl groups in the sodium 1-naphthol-3,6-disulfonate structure undergo a substitution reaction, thereby fixing sodium 1-naphthol-3,6-disulfonate on the surface of the bamboo fiber, thus obtaining the reinforcing component.

[0041] II. Preparation of Inorganic Modified Fillers

[0042] AA1: Under nitrogen protection, 2g of N,N,N',N'-tetramethylethylenediamine was added to N,N-dimethylformamide and ultrasonically dispersed for 20min. Then, 2.8g of 2,6-dichlorobenzoic acid was added. After the addition was complete, heating was started. After the system temperature reached 65℃, the mixture was stirred at a constant temperature for 6h. The mixture was then cooled and discharged to obtain the intermediate material.

[0043] AA2: 4g of attapulgite with an average particle size of 5μm was ultrasonically dispersed in deionized water to form a dispersion. 3.5g of intermediate material was added to the dispersion. After the addition was complete, the mixture was stirred at 70℃ for 4h. The material was filtered, and a solid sample was taken. The sample was washed with deionized water and dried to obtain the inorganic modified filler.

[0044] Infrared spectral analysis of inorganic modified fillers was performed using a Nicolet 170sx Fourier transform infrared spectrometer (USA). Figure 2 As shown, by Figure 2 It can be seen that in the infrared spectrum of inorganic modified fillers, 3641 cm⁻¹ -1 The characteristic absorption peak of Al-OH appears at 1025 cm⁻¹. -1 The characteristic absorption peak of Si-O-Si appears at 3026 cm⁻¹. -1 The characteristic absorption peak of the carbon-hydrogen bond in the benzene ring appears at 1760 cm⁻¹. -1 The characteristic absorption peak of the carboxyl group C=O appears at 1405 cm⁻¹. -1 The characteristic absorption peak of CN in quaternary ammonium salt appears at this location.

[0045] Technical principles: in the inorganic modified filler, first, the tertiary amine group in the structure of N, N, N', N'-tetramethyl ethylenediamine reacts with the halogen functional group in the structure of 2, 6-dichlorobenzoic acid to form a polymer containing a large number of quaternary ammonium salt and carboxyl groups in the molecular chain, that is, the intermediate material; second, the cation of quaternary ammonium salt and the exchangeable cation between the layers of allevardite are ion exchanged, the intermediate material is inserted into the interlayer of allevardite, and the inorganic modified filler is obtained.

[0046] III. Preparation of environment-friendly lightweight calcium silicate board

[0047] (1) 40 g of fly ash, 30 g of cement, 4 g of slaked lime, 8 g of reinforcing component, 5 g of inorganic modified filler and 100 g of water are mixed, stirred at a stirring rate of 600 r / min for 4 h, and a mixed slurry is obtained;

[0048] (2) The mixed slurry is poured into a mold, and then a cold press is used to apply a pressure of 20 MPa for pressing, the pressure is kept constant during the pressing process, and the duration is 30 min to ensure that the slurry is fully solidified, and then demolding treatment is carried out, and a green board is obtained;

[0049] (3) The green board is cut into products of required specifications, pre-cured at a pre-curing temperature of 50℃ and a humidity of 60% for 10 h, placed in a steam curing kettle, cured at a temperature of 160℃ and a pressure of 0.8 MPa for 8 h, and then dried at a temperature of 70℃, and an environment-friendly lightweight calcium silicate board is obtained.

[0050] Example 2.

[0051] Preparation of environment-friendly lightweight calcium silicate board

[0052] (1) 50 g of fly ash, 40 g of cement, 5 g of slaked lime, 9 g of reinforcing component, 6 g of inorganic modified filler and 150 g of water are mixed, stirred at a stirring rate of 700 r / min for 6 h, and a mixed slurry is obtained;

[0053] (2) The mixed slurry is poured into a mold, and then a cold press is used to apply a pressure of 30 MPa for pressing, the pressure is kept constant during the pressing process, and the duration is 45 min to ensure that the slurry is fully solidified, and then demolding treatment is carried out, and a green board is obtained;

[0054] (3) The green board is cut into products of required specifications, pre-cured at a pre-curing temperature of 55℃ and a humidity of 70% for 15 h, placed in a steam curing kettle, cured at a temperature of 180℃ and a pressure of 0.9 MPa for 10 h, and then dried at a temperature of 75℃, and an environment-friendly lightweight calcium silicate board is obtained.

[0055] The preparation method of the reinforcing component and the inorganic modified filler is the same as that in Embodiment 1.

[0056] Embodiment 3.

[0057] Preparation of the environmentally friendly lightweight calcium silicate board

[0058] (1) 60 g of fly ash, 50 g of cement, 6 g of slaked lime, 10 g of the reinforcing component, 7 g of the inorganic modified filler, and 200 g of water are mixed, and stirred at a stirring rate of 800 r / min for 8 h to obtain a mixed slurry;

[0059] (2) The mixed slurry is poured into a mold, and then a cold press is used to apply a pressure of 40 MPa for pressing, the pressure is kept constant during the pressing process, and the duration is 50 min to ensure that the slurry is fully solidified, and then a demolding treatment is performed to obtain a green board;

[0060] (3) The green board is cut into products of a required specification, and after a pre-curing treatment at a pre-curing temperature of 60 ℃ and a humidity of 80% for 20 h, the green board is placed in a steam curing kettle for curing at a temperature of 200 ℃ and a pressure of 1 MP for 12 h, and then dried at a temperature of 80 ℃ to obtain the environmentally friendly lightweight calcium silicate board.

[0061] The preparation method of the reinforcing component and the inorganic modified filler is the same as that in Embodiment 1.

[0062] Comparative Example 1.

[0063] Preparation of the environmentally friendly lightweight calcium silicate board

[0064] (1) 50 g of fly ash, 40 g of cement, 5 g of slaked lime, 9 g of the reinforcing component, and 150 g of water are mixed, and stirred at a stirring rate of 700 r / min for 6 h to obtain a mixed slurry;

[0065] (2) The mixed slurry is poured into a mold, and then a cold press is used to apply a pressure of 30 MPa for pressing, the pressure is kept constant during the pressing process, and the duration is 45 min to ensure that the slurry is fully solidified, and then a demolding treatment is performed to obtain a green board;

[0066] (3) The green board is cut into products of a required specification, and after a pre-curing treatment at a pre-curing temperature of 55 ℃ and a humidity of 70% for 15 h, the green board is placed in a steam curing kettle for curing at a temperature of 180 ℃ and a pressure of 0.9 MP for 10 h, and then dried at a temperature of 75 ℃ to obtain the environmentally friendly lightweight calcium silicate board.

[0067] The preparation method of the reinforcing component is the same as that in Embodiment 1.

[0068] Comparative Example 2.

[0069] Preparation of environment-friendly lightweight calcium silicate board

[0070] (1) 50 g of fly ash, 40 g of cement, 5 g of slaked lime, 6 g of inorganic modified filler and 150 g of water were mixed, stirred at a stirring rate of 700 r / min for 6 h to obtain a mixed slurry;

[0071] (2) The mixed slurry was poured into a mold, and then a cold press was used to apply a pressure of 30 MPa for pressing, the pressure was kept constant during the pressing process, and the duration was 45 min to ensure that the slurry was fully solidified, and then a demolding treatment was performed to obtain a green board;

[0072] (3) The green board was cut into products of required specifications, and after a pre-curing treatment at a pre-curing temperature of 55℃ and a humidity of 70% for 15 h, the green board was placed in a steam curing kettle for curing at a temperature of 180℃ and a pressure of 0.9 MP for 10 h, and then a drying treatment was performed at a temperature of 75℃ to obtain the environment-friendly lightweight calcium silicate board.

[0073] The preparation method of the inorganic modified filler is the same as that in Example 1.

[0074] Comparative Example 3

[0075] Preparation of environment-friendly lightweight calcium silicate board

[0076] (1) 50 g of fly ash, 40 g of cement, 5 g of slaked lime and 150 g of water were mixed, stirred at a stirring rate of 700 r / min for 6 h to obtain a mixed slurry;

[0077] (2) The mixed slurry was poured into a mold, and then a cold press was used to apply a pressure of 30 MPa for pressing, the pressure was kept constant during the pressing process, and the duration was 45 min to ensure that the slurry was fully solidified, and then a demolding treatment was performed to obtain a green board;

[0078] (3) The green board was cut into products of required specifications, and after a pre-curing treatment at a pre-curing temperature of 55℃ and a humidity of 70% for 15 h, the green board was placed in a steam curing kettle for curing at a temperature of 180℃ and a pressure of 0.9 MP for 10 h, and then a drying treatment was performed at a temperature of 75℃ to obtain the environment-friendly lightweight calcium silicate board.

[0079] Performance detection:

[0080] The environment-friendly lightweight calcium silicate boards prepared in Examples 1-3 and Comparative Examples 1-3 of the present application were made into samples conforming to the specifications, and the bending strength and impact strength performance tests were performed on the samples according to JC / T 564.1-2018 “Fiber Reinforced Calcium Silicate Board Part 1: Non-asbestos Calcium Silicate Board”, and the specific test results are shown in Table 1:

[0081] Table 1-Performance test

[0082]

[0083] From the test results in Table 1, it can be seen that the calcium silicate boards prepared in Examples 1-3 have excellent strength performance; the calcium silicate board prepared in Comparative Example 1 only adds a reinforcing component, and compared with the examples, the flexural strength and impact strength of the calcium silicate board are slightly decreased, and the strength performance is general; the calcium silicate board prepared in Comparative Example 2 does not add a reinforcing component, and cannot synergistically improve the strength of the calcium silicate board with the inorganic modified filler, resulting in further reduction of the strength of the calcium silicate board; the calcium silicate board prepared in Comparative Example 3 neither adds a reinforcing component nor adds an inorganic modified filler, so the strength performance of the calcium silicate board is the worst.

[0084] The above is only an example and description of the concept of the present application, and those skilled in the art can make various modifications or supplements to the described specific examples or use similar ways to replace them, as long as they do not deviate from the concept of the present application or exceed the scope defined by the present claims, and they should belong to the protection scope of the present application.

Claims

1. A method for producing an environmentally friendly lightweight calcium silicate board, characterized in that, The calcium silicate board comprises the following raw materials in parts by weight: 40-60 parts fly ash, 30-50 parts cement, 4-6 parts hydrated lime, 8-10 parts reinforcing components, 5-7 parts inorganic modified filler, and 100-200 parts water. The method for preparing the reinforcing component includes the following steps: A1: Bamboo fiber is placed in potassium hydroxide solution and shaken for 1-2 hours at a temperature of 40-50℃ and a rotation speed of 100-200 r / min. After washing and drying, alkalized bamboo fiber is obtained. A2: Add alkalized bamboo fiber and bromoacetic acid to N-methylpyrrolidone, sonicate until a uniform suspension is formed, then add a catalyst for treatment, raise the system temperature to 105-115℃ under stirring conditions, keep it at that temperature for 3-5 hours, let the material cool naturally, centrifuge to separate the solid material, wash the solid material, vacuum dry it to obtain modified bamboo fiber. The catalyst is any one of tetraethyl titanate, tetrabutyl titanate, or tetraisopropyl titanate. A3: Under the action of the accelerator, the modified bamboo fiber, sodium 1-naphthol-3,6-disulfonate and dimethyl sulfoxide solution are mixed, magnetically stirred until uniform, the system temperature is raised to 70-80℃, kept warm and stirred for 4-6 hours, discharged, washed and dried to obtain the reinforcing component. The accelerator is any one of sodium carbonate, potassium carbonate, or sodium bicarbonate. The preparation method of the inorganic modified filler includes the following steps: AA1: Add N,N,N',N'-tetramethylethylenediamine to N,N-dimethylformamide, ultrasonically disperse for 15-25 min, then add chlorine source. After the addition is complete, turn on the heating. When the temperature reaches 60-70℃, stir at a constant temperature for 4-8 h, cool down and discharge to obtain intermediate material. The chlorine source is either 2,6-dichlorobenzoic acid or dichloroacetic acid; AA2: Disperse attapulgite in deionized water using ultrasound to form a dispersion. Add intermediate material to the dispersion. After the addition is complete, stir at 65-75℃ for 2-6 hours. Filter the material, take a solid sample, wash the sample with deionized water, and dry it to obtain the inorganic modified filler. The production method includes the following steps: (1) Mix fly ash, cement, hydrated lime, reinforcing components, inorganic modified filler and water, and stir at a stirring rate of 600-800 r / min for 4-8 h to obtain a mixed slurry; (2) Pour the mixed slurry into the mold, and then use a cold press to apply a pressure of 20-40 MPa for pressing. During this pressing process, the pressure is kept constant and the duration is 30-50 minutes to ensure that the slurry is fully cured. Then, after demolding, the blank is obtained. (3) Cut the blank into products of the required specifications, and then perform pre-curing, autoclaving and drying treatments to obtain environmentally friendly lightweight calcium silicate board.

2. The method for producing an environmentally friendly lightweight calcium silicate board according to claim 1, characterized in that, In step (3), the pre-curing process is as follows: pre-curing treatment for 10 to 20 hours in an environment with a pre-curing temperature of 50 to 60°C and a humidity of 60 to 80%.

3. The method for producing an environmentally friendly lightweight calcium silicate board according to claim 1, characterized in that, In step A1, the mass fraction of the potassium hydroxide solution is 10% to 40%.

4. The method for producing an environmentally friendly lightweight calcium silicate board according to claim 1, characterized in that, In step AA2, the average particle size of the rettosite is 5 μm.

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