Lightweight glass magnesium board and manufacturing method thereof

Abstract

The present invention belongs to the technical field of inorganic board materials, and in particular discloses a lightweight glass magnesium board and a method for making the same. The lightweight glass magnesium board uses a lightweight magnesium silicate-based filler generated by a hydrothermal reaction under specific conditions as a lightweight component, and can fully utilize its performance advantages of large specific surface area, light apparent density, and high compressive strength; as an inorganic filler, it is different from glass fiber and foaming slurry, is non-toxic and harmless to the human body, and has good compatibility with the inorganic system of the glass magnesium board. When added to the glass magnesium board, it can not only effectively reduce the density of the board, but also does not affect the internal bonding strength of the board. The lightweight magnesium silicate-based filler has good compatibility with the glass magnesium board and can be evenly dispersed in the glass magnesium board to play a density-reducing role. In addition, as the curing age of the obtained lightweight glass magnesium board is extended, the lightweight magnesium silicate-based filler will further hydrate, and the compressive strength will gradually increase, which will also significantly enhance the mechanical properties of the lightweight glass magnesium board.

Description

Technical Field

[0001] The present invention belongs to the technical field of inorganic plates, and in particular relates to a lightweight glass magnesium plate and a manufacturing method thereof. Background Art

[0002] With the implementation of GB50222-2017 "Code for Fire Protection Design of Building Interior Decoration", the fire protection requirements for building materials are becoming increasingly stringent, the market competition is becoming more and more fierce, and higher requirements are also placed on the performance of board materials.

[0003] As a non-flammable, environmentally friendly, non-toxic, odorless, insect-proof and long-life building material, the annual demand for glass magnesium board is increasing at a rate of 15%, showing an excellent market prospect. However, the density of glass magnesium board is generally 1.2t / m 3 The above is far more than wood boards and lightweight calcium silicate boards, which is not conducive to transportation and installation, thus limiting its application in the field of high-end panels.

[0004] Therefore, achieving light weight and high strength of glass magnesium board is the key to promoting the application of glass magnesium board in the field of high-end functional panels. Summary of the Invention

[0005] In order to solve the problems of the above-mentioned prior art, the present invention provides a new type of lightweight glass magnesium board, which uses a lightweight magnesium silicate-based filler as the lightweight filler. The lightweight magnesium silicate-based filler has the advantages of large specific surface area, light apparent density, high compressive strength, and good compatibility with the inorganic system of the glass magnesium board. When added to the glass magnesium board, it can effectively reduce the density of the board without affecting the internal bonding strength of the board.

[0006] The present invention specifically adopts the following technical solutions:

[0007] A lightweight glass magnesium board is obtained by injection molding, curing and solidifying a slurry obtained by uniformly mixing a lightweight magnesium silicate-based filler, magnesium sulfate, magnesium oxide, an inorganic filler, a setting regulator, an organic functional additive and water.

[0008] The light magnesium silicate-based filler is prepared by mixing a silicon-containing inorganic substance and a magnesium-containing inorganic substance in a ratio of silicon to magnesium of 1:1 to 3, and performing a hydrothermal reaction at a temperature of 140°C to 220°C and a stirring rate of 100 rpm to 800 rpm for 1 hour to 5 hours.

[0009] By using the lightweight magnesium silicate-based filler generated by a hydrothermal reaction under specific conditions as the lightweight component in the lightweight glass magnesium board, its performance advantages of large specific surface area, light apparent density and high compressive strength can be fully utilized. At the same time, as an inorganic filler, it has good compatibility with the inorganic system of the glass magnesium board. Adding it to the glass magnesium board can not only effectively reduce the density of the board, but also does not affect the internal bonding strength of the board.

[0010] Furthermore, unlike glass fiber and foaming slurry, the lightweight magnesium silicate-based filler is non-toxic and harmless to the human body, has good compatibility with the glass magnesium board, and can be evenly dispersed in the glass magnesium board to exert a density-reducing effect. Furthermore, as the curing age of the obtained lightweight glass magnesium board increases, the lightweight magnesium silicate-based filler will further hydrate, gradually increasing its compressive strength and significantly enhancing the mechanical properties of the lightweight glass magnesium board.

[0011] Preferably, the lightweight magnesium silicate-based filler can be prepared by incorporating a silicon-containing inorganic substance and a magnesium-containing inorganic substance into wood fibers and subjecting them to a hydrothermal reaction. In this manner, the silicon source in the resulting magnesium silicate can form silanol structures (Si-OH) with hydroxyl groups on the surface of the wood fibers, thereby grafting the formed magnesium silicate onto the wood fibers to form a fiber-magnesium silicate composite material.

[0012] Furthermore, the wood fiber is made by kneading and grinding straw, wood, waste kraft paper, bamboo and the like, and has an aspect ratio greater than 20.

[0013] Taking advantage of the high aspect ratio of wood fiber, this fiber-magnesium silicate composite material is added to glass magnesium board to further enhance the board's flexural strength and screw holding capacity, while reducing the board's density. Furthermore, this method of incorporating wood fiber as a lightweight filler offers a stronger reinforcement effect than the toughening method of directly adding wood fiber to glass magnesium board. The connection between the wood fiber and the magnesium silicate filler through the silanol structure improves interfacial compatibility with the inorganic board.

[0014] Furthermore, the addition amount of the above-mentioned wood fiber can be controlled to be 5% to 20% of the total mass of the silicon-containing inorganic matter and the magnesium-containing inorganic matter.

[0015] Preferably, the above-mentioned silicon-containing inorganic matter is silicon-containing industrial solid waste, such as one or a mixture of at least two of silica fume, fly ash, feldspar powder, asbestos tailings, and magnesium slag; the magnesium-containing inorganic matter is magnesium-containing industrial solid waste, such as one or a mixture of at least two of magnesium slag, deactivated magnesium oxide, and bischofite slag.

[0016] Using industrial solid waste as a source of silicon- and magnesium-containing inorganics can also provide a way to transform this bulk industrial solid waste into valuable resources, increasing economic value and reducing environmental pollution. Furthermore, this recycling method, which prepares lightweight magnesium silicate-based fillers through hydrothermal treatment, achieves the goal of lightweighting rather than the denser board material achieved by direct incorporation.

[0017] In the above slurry, the amount ratio of active magnesium oxide and magnesium sulfate in magnesium oxide is 5 to 7:1; the amount of light magnesium silicate-based filler is 5% to 70% of the total mass of magnesium oxide and magnesium sulfate, preferably 10% to 40%; the amount of inorganic filler is 1% to 5% of the total mass of magnesium oxide and magnesium sulfate; the amount of setting agent is 0.2% to 1% of the total mass of magnesium oxide and magnesium sulfate; and the amount of organic functional additive is 0.5% to 5% of the total mass of magnesium oxide and magnesium sulfate.

[0018] Furthermore, the inorganic filler is any one of bentonite, diatomaceous earth, and fly ash, or a mixture of at least two of them; the setting agent is any one of citric acid, sodium citrate, malic acid, and sodium polyphosphate, or a mixture of at least two of them; and the organic functional additive is any one of acrylic emulsion, silicone acrylic emulsion, pure acrylic emulsion, styrene acrylic emulsion, and epoxy resin, or a mixture of at least two of them.

[0019] The preparation method of the lightweight glass magnesium board provided by the present invention comprises the following steps:

[0020] Step S1, preparation of light magnesium silicate-based filler.

[0021] Specifically, a silicon-containing inorganic material and a magnesium-containing inorganic material are mixed in a ratio of silicon to magnesium of 1:1 to 3, and a hydrothermal reaction is carried out at a temperature of 140° C. to 220° C. and a stirring rate of 100 rpm to 800 rpm for 1 hour to 5 hours. The product of the hydrothermal reaction is washed, filtered, and dried to obtain a lightweight magnesium silicate-based filler.

[0022] Step S2: Preparation of board-making slurry.

[0023] Specifically, the light magnesium silicate-based filler prepared in step S1 is evenly mixed with magnesium sulfate, magnesium oxide, an inorganic filler, a setting agent, an organic functional additive and water to obtain a slurry for making a board.

[0024] Among them, the amount of active magnesium oxide and magnesium sulfate in magnesium oxide is controlled to be 5-7:1; the amount of light magnesium silicate-based filler is 5%-70% of the total mass of magnesium oxide and magnesium sulfate, preferably 10%-40%; the amount of inorganic filler is 1%-5% of the total mass of magnesium oxide and magnesium sulfate; the amount of setting agent is 0.2%-1% of the total mass of magnesium oxide and magnesium sulfate; and the amount of organic functional additive is 0.5%-5% of the total mass of magnesium oxide and magnesium sulfate.

[0025] Step S3: Slurry injection molding and slab preparation.

[0026] Specifically, the slurry obtained in step S2 is injected into a mold, placed under appropriate temperature and humidity conditions for curing, and solidified to obtain a glass magnesium board blank.

[0027] Generally, the curing conditions are 20°C to 60°C and 60%±5% RH for 7d to 28d.

[0028] Step S4: The glass magnesium board blank is dried, sanded, and cut to obtain a lightweight glass magnesium board.

[0029] Preferably, in the preparation of the light magnesium silicate-based filler in step S1 above, wood fiber may be added thereto to participate in the hydrothermal reaction, so as to further reduce the apparent density of the obtained light magnesium silicate-based filler.

[0030] Generally, in the hydrothermal reaction of step S1 above, the amount of water used in the hydrothermal reaction is controlled to be 15 to 30 times the total mass of the silicon-containing inorganic substance and the magnesium-containing inorganic substance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a SEM image of a light magnesium silicate-based inorganic filler provided in Example 4 of the present invention;

[0032] Figure 2 This is a SEM image of a light magnesium silicate-based inorganic filler provided in Example 3 of the present invention;

[0033] Figure 3 is a SEM image of a comparative magnesium silicate-based filler provided in Comparative Example 4 of the present invention. DETAILED DESCRIPTION

[0034] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0035] Example 1

[0036] This embodiment provides a lightweight glass magnesium board and a manufacturing method thereof.

[0037] First, silica fume (SiO2 mass fraction of 52%) and deactivated magnesium oxide (MgO mass fraction of 65%) were selected as raw materials; 172g of silica fume, 95g of deactivated magnesium oxide powder, 4400g of water, and 15g of straw fiber were weighed, and a hydrothermal reaction was carried out at a temperature of 150°C and a stirring rate of 400rpm for 4h.

[0038] Then, the product after the hydrothermal reaction is washed, filtered and dried to obtain a white light magnesium silicate-based filler.

[0039] Next, 188 g of the above-mentioned light magnesium silicate-based filler, 500 g of magnesium sulfate, 1388.9 g of magnesium oxide (activity 60%), 18.9 g of bentonite, 3.8 g of citric acid, and 9.45 g of acrylic emulsion were weighed and stirred evenly in 730 g of water to prepare a slurry.

[0040] The fourth step is to inject the slurry into a 50 cm×50 cm mold, place it under the conditions of a temperature of 30° C. and a humidity of 60% RH for curing for 14 days, and solidify it to obtain a glass magnesium board blank.

[0041] Finally, the glass magnesium board blank is dried, sanded and cut to obtain a lightweight glass magnesium board.

[0042] Example 2

[0043] This embodiment provides a lightweight glass magnesium board and a manufacturing method thereof.

[0044] First, fly ash (SiO2 mass fraction of 55%) and bischofite (MgCl2 mass fraction of 90%) were selected as raw materials; 420g of fly ash, 500g of bischofite, 16200g of water, and 180g of wood fiber were weighed, and a hydrothermal reaction was carried out at a temperature of 220°C and a stirring rate of 800rpm for 1h.

[0045] Then, the product after the hydrothermal reaction is washed, filtered and dried to obtain a white light magnesium silicate-based filler.

[0046] Next, 168 g of the above-mentioned light magnesium silicate-based filler, 500 g of magnesium sulfate, 1667 g of magnesium oxide (activity 70%), 21.7 g of diatomaceous earth, 4.34 g of sodium citrate, and 90 g of epoxy resin were weighed and stirred evenly in 1070 g of water to prepare a slurry.

[0047] The fourth step is to inject the slurry into a 50 cm×50 cm mold, place it under the conditions of a temperature of 60° C. and a humidity of 65% RH for curing for 7 days, and solidify it to obtain a glass magnesium board blank.

[0048] Finally, the glass magnesium board blank is dried, sanded and cut to obtain a lightweight glass magnesium board.

[0049] Example 3

[0050] This embodiment provides a lightweight glass magnesium board and a manufacturing method thereof.

[0051] First, feldspar powder (SiO2 mass fraction of 76%) and magnesium slag (MgO mass fraction of 40%) were selected as raw materials; 300g of feldspar powder, 651g of magnesium slag, 14270g of water, and 95g of bamboo fiber were weighed, and a hydrothermal reaction was carried out at a temperature of 200°C and a stirring rate of 600rpm for 3h.

[0052] Then, the product after the hydrothermal reaction is washed, filtered and dried to obtain a white light magnesium silicate-based filler.

[0053] Again, 780 g of the above-mentioned lightweight magnesium silicate-based filler, 450 g of magnesium sulfate, 1500 g of magnesium oxide (activity 70%), 97 g of fly ash, 19 g of sodium citrate, and 58 g of styrene-acrylic emulsion were weighed and stirred evenly in 1200 g of water to prepare a slurry.

[0054] The fourth step is to inject the slurry into a 50 cm×50 cm mold, place it under a temperature of 40° C. and a humidity of 65% RH for curing for 14 days, and solidify it to obtain a glass magnesium board blank.

[0055] Finally, the glass magnesium board blank is dried, sanded and cut to obtain a lightweight glass magnesium board.

[0056] Example 4

[0057] This embodiment provides a lightweight glass magnesium board and a manufacturing method thereof.

[0058] The similarities between this embodiment and Example 3 are not described here in detail. Only the differences from Example 3 are described. This embodiment differs from Example 3 in that bamboo fiber is not used as a raw material in the first step of the hydrothermal reaction for preparing the lightweight magnesium silicate-based filler. The remaining steps are similar to those described in Example 3, and a lightweight glass magnesium board is produced.

[0059] In order to demonstrate the necessity of the above components and the various processes in the preparation method thereof in the present invention, several comparative experiments were conducted.

[0060] Example 5

[0061] This embodiment provides a lightweight glass magnesium board and a manufacturing method thereof.

[0062] First, silica fume (SiO2 mass fraction of 80%) and deactivated magnesium oxide (MgO mass fraction of 85%) were selected as raw materials; 1200g of silica fume, 2250g of deactivated magnesium oxide, 103500g of water, and 1800g of wood fiber were weighed, and a hydrothermal reaction was carried out at a temperature of 140°C and a stirring rate of 100rpm for 5h.

[0063] Then, the product after the hydrothermal reaction is washed, filtered and dried to obtain a white light magnesium silicate-based filler.

[0064] Next, 2487 g of the above-mentioned light magnesium silicate-based filler, 700 g of magnesium sulfate, 1667 g of magnesium oxide (activity 70%), 21.7 g of diatomaceous earth, 4.34 g of sodium citrate, and 118 g of acrylic emulsion were weighed and stirred evenly in 1070 g of water to prepare a slurry.

[0065] The fourth step is to inject the slurry into a 50 cm×50 cm mold, place it under the conditions of a temperature of 60° C. and a humidity of 65% RH for curing for 7 days, and solidify it to obtain a glass magnesium board blank.

[0066] Finally, the glass magnesium board blank is dried, sanded and cut to obtain a lightweight glass magnesium board.

[0067] Comparative Example 1

[0068] This comparative example aims to illustrate the importance of the lightweight magnesium silicate-based filler in the lightweight glass magnesium board by performing an experiment without the lightweight magnesium silicate-based filler compared with Example 4.

[0069] The similarities between this comparative example and Example 4 are not described here in detail. Only the differences from Example 4 are described. This comparative example differs from Example 4 in that the raw materials for making this comparative example lack a light magnesium silicate-based filler. The remainder of the process is similar to that described in Example 4, and a first comparative glass magnesium board is obtained.

[0070] Comparative Example 2

[0071] This comparative example aims to illustrate the effect of the wood fiber addition method on the performance of the glass magnesium board by adjusting the wood fiber addition method compared with Example 3.

[0072] The similarities between this comparative example and Example 3 are not described here in detail, and only the differences from Example 3 are described. The difference between this comparative example and Example 3 is that bamboo fiber is absent from the raw materials for making the lightweight magnesium silicate-based filler in this comparative example. Instead, an equal amount of bamboo fiber is directly added to the slurry preparation, so that the bamboo fiber forms a glass magnesium board by direct addition. The rest of the process is the same as described in Example 3, and a second comparative glass magnesium board is obtained.

[0073] Comparative Example 3

[0074] This comparative example is an experiment in which a commercially available conventional magnesium silicate is used to replace the lightweight magnesium silicate-based filler synthesized by a specific hydrothermal reaction, compared with Example 4, to illustrate the importance of the lightweight magnesium silicate-based filler synthesized by a specific hydrothermal reaction in the lightweight glass magnesium board.

[0075] The similarities between this comparative example and Example 4 are not described here in detail. Only the differences from Example 4 are described. This comparative example differs from Example 4 in that an equal amount of conventional magnesium sulfate is used in place of the light magnesium silicate-based filler in the raw materials of this comparative example. The remainder of the preparation is similar to that of Example 4, thereby obtaining a third comparative glass magnesium board.

[0076] Comparative Example 4

[0077] This comparative example aims to illustrate the importance of the hydrothermal synthesis temperature of the lightweight magnesium silicate-based filler in the lightweight glassy magnesium board by lowering the hydrothermal synthesis temperature of the lightweight magnesium silicate-based filler compared with Example 4.

[0078] The similarities between this comparative example and Example 4 are not described here in detail. Only the differences from Example 4 are described. This comparative example differs from Example 4 in that, in the preparation of this comparative example, the hydrothermal reaction temperature was lowered to 120°C during the hydrothermal synthesis of the lightweight magnesium silicate-based filler, thereby obtaining a comparative magnesium silicate-based filler. The remaining steps were similar to those described in Example 4, thereby obtaining a fourth comparative glassy magnesium board.

[0079] Comparative Example 5

[0080] This comparative example aims to illustrate the importance of the hydrothermal synthesis temperature of the lightweight magnesium silicate-based filler in the lightweight glassy magnesium board by increasing the hydrothermal synthesis temperature of the lightweight magnesium silicate-based filler compared to Example 4.

[0081] The similarities between this comparative example and Example 4 are not described here in detail. Only the differences from Example 4 are described. This comparative example differs from Example 4 in that, in the preparation of this comparative example, the hydrothermal reaction temperature was increased to 240°C during the hydrothermal synthesis of the lightweight magnesium silicate-based filler to obtain a comparative magnesium silicate-based filler. The remaining steps were similar to those described in Example 4 to obtain a fifth comparative glassy magnesium board.

[0082] Comparative Example 6

[0083] This comparative example aims to illustrate the importance of the stirring rate during the hydrothermal synthesis of the lightweight magnesium silicate-based filler in the lightweight glassy magnesium board by reducing the stirring rate during the hydrothermal synthesis of the lightweight magnesium silicate-based filler compared to Example 4.

[0084] The similarities between this comparative example and Example 4 are not described here in detail. Only the differences from Example 4 are described. This comparative example differs from Example 4 in that, in the preparation of this comparative example, the stirring rate during the hydrothermal synthesis of the lightweight magnesium silicate-based filler was reduced to 50 rpm, thereby obtaining a comparative magnesium silicate-based filler. The remainder of the preparation was similar to that described in Example 4, thereby obtaining a sixth comparative glassy magnesium board.

[0085] Comparative Example 7

[0086] This comparative example aims to illustrate the importance of the stirring rate during the hydrothermal synthesis of the lightweight magnesium silicate-based filler in the lightweight glassy magnesium board by accelerating the stirring rate during the hydrothermal synthesis of the lightweight magnesium silicate-based filler compared to Example 4.

[0087] The similarities between this comparative example and Example 4 are not described here in detail. Only the differences from Example 4 will be described. This comparative example differs from Example 4 in that, in the preparation of this comparative example, the stirring rate during the hydrothermal synthesis of the lightweight magnesium silicate-based filler was increased to 1000 rpm, thereby obtaining a comparative magnesium silicate-based filler. The remaining conditions were similar to those described in Example 4, thereby obtaining a seventh comparative glassy magnesium board.

[0088] The physical and chemical properties of the glass magnesium boards provided in the above embodiments and comparative examples were tested, and the test results are shown in Table 1 below.

[0089] Table 1 Physical and chemical properties of the glass magnesium board provided in each embodiment and comparative example

[0090]

[0091] By comparing Comparative Example 1 and Example 4, it can be seen that the density of the glass magnesium board without adding the light magnesium silicate-based filler of the present invention is as high as 1.32 g / cm 3 , and the density of the corresponding glass magnesium board after adding is only 1.03g / cm 3 , the density dropped by about 22%, achieving the goal of lightweight. At the same time, the 7d and 14d flexural strength of the glass magnesium board were also significantly improved after adding lightweight magnesium silicate-based fillers; this is because lightweight magnesium silicate-based fillers have a porous and fluffy structure, such as Figure 1 As shown, the density of the board can be effectively reduced. At the same time, as the curing period is extended, the magnesium silicate filler has a similar film-forming effect, filling the gaps in the glass magnesium board and also improving the mechanical properties of the glass magnesium board.

[0092] By comparing Comparative Example 2 and Example 3, it can be seen that the effect of adding the fiber-magnesium silicate composite light magnesium silicate-based filler to the glass magnesium board after the fiber is hydrothermally formed is better than adding it directly to the glass magnesium board. This is because the hydroxyl groups on the fiber surface form silanol structures with silicon-containing industrial solid waste during the hydrothermal process, which allows magnesium silicate to form on the fiber surface. Figure 2 When fiber-magnesium silicate composite material is added to glass magnesium board, it can be easily mixed with inorganic materials of glass magnesium board, thus facilitating obtaining better mechanical properties.

[0093] By comparing Comparative Example 3 and Example 4, it can be seen that the addition of commercially available magnesium silicate does not play the role of a lightweight filler, because most commercially available magnesium silicate is talc material, and the crystals are pseudo-hexagonal or rhombic flakes, with a specific gravity as high as 2.7 to 2.8. It does not have the lightweight characteristics of the lightweight magnesium silicate-based filler synthesized by the specific hydrothermal reaction in the present invention, and therefore has an adverse effect on the density reduction of the glass magnesium board.

[0094] By comparing Comparative Examples 4 and 5 with Example 4, it can be seen that in the preparation process of light magnesium silicate-based fillers, too high or too low hydrothermal reaction temperature has an adverse effect on the formation of light magnesium silicate-based fillers. Figure 3 It can be seen that the comparative magnesium silicate-based filler still contains a large amount of unreacted silica spherical particles. Similarly, when the reaction temperature is too high, the crystallinity and density of the comparative magnesium silicate-based filler increase, and thus the filler loses its lightweight properties.

[0095] Comparing Comparative Examples 6 and 7 with Example 4 reveals that, during the hydrothermal preparation of the lightweight magnesium silicate-based filler, a stirring rate that is too slow causes the comparative magnesium silicate-based filler to easily aggregate and clog the discharge port of the hydrothermal reaction apparatus. However, a stirring rate that is too fast results in a smaller particle size, higher crystallinity, and higher bulk density for the comparative magnesium silicate-based filler, while also resulting in unnecessary energy waste.

Claims

1. A lightweight glass magnesium board, characterized in that: A slurry is obtained by uniformly mixing a light magnesium silicate-based filler, magnesium sulfate, magnesium oxide, an inorganic filler, a setting regulator, an organic functional additive, and water, and performing injection molding, curing, and solidification molding; in the slurry, the molar ratio of active magnesium oxide in the magnesium oxide to the magnesium sulfate is 5 to 7:1; the amount of the light magnesium silicate-based filler is 5% to 70% of the total mass of the magnesium oxide and the magnesium sulfate; the amount of the inorganic filler is 1% to 5% of the total mass of the magnesium oxide and the magnesium sulfate; the amount of the setting regulator is 0.2% to 1% of the total mass of the magnesium oxide and the magnesium sulfate; and the amount of the organic functional additive is 0.5% to 5% of the total mass of the magnesium oxide and the magnesium sulfate; The lightweight magnesium silicate-based filler is prepared by mixing a silicon-containing inorganic material and a magnesium-containing inorganic material in a ratio of silicon to magnesium of 1:1 to 3, and adding wood fiber in an amount of 5% to 20% of the total mass of the silicon-containing inorganic material and the magnesium-containing inorganic material, and performing a hydrothermal reaction at a temperature of 140°C to 220°C and a stirring rate of 100 rpm to 800 rpm for 1 h to 5 h.

2. The lightweight glass magnesium board according to claim 1, characterized in that: The wood fiber is made from straw, wood, waste kraft paper and bamboo through kneading and grinding, and has an aspect ratio greater than 20.

3. The lightweight glass magnesium board according to claim 1 or 2, characterized in that: The silicon-containing inorganic matter is silicon-containing industrial solid waste, and the magnesium-containing inorganic matter is magnesium-containing industrial solid waste.

4. The lightweight glass magnesium board according to claim 3, characterized in that: The silicon-containing industrial solid waste is selected from at least one of silica fume, fly ash, feldspar powder, asbestos tailings, and magnesium slag; the magnesium-containing inorganic matter is selected from at least one of magnesium slag, deactivated magnesium oxide, and bischofite slag.

5. The lightweight glass magnesium board according to claim 3, characterized in that: The inorganic filler is selected from at least one of bentonite, diatomaceous earth, and fly ash; the setting regulator is selected from at least one of citric acid, sodium citrate, malic acid, and sodium polyphosphate; and the organic functional additive is selected from at least one of acrylic emulsion, silicone-acrylic emulsion, pure acrylic emulsion, styrene-acrylic emulsion, and epoxy resin.

6. The method for producing a lightweight glass magnesium board according to any one of claims 1 to 5, characterized in that: Including steps: S1. Preparation of a light magnesium silicate-based filler: A silicon-containing inorganic substance and a magnesium-containing inorganic substance are mixed in a ratio of silicon to magnesium of 1:1 to 3, and wood fiber is added in an amount of 5% to 20% of the total mass of the silicon-containing inorganic substance and the magnesium-containing inorganic substance. The mixture is hydrothermally reacted at a temperature of 140° C. to 220° C. and a stirring rate of 100 rpm to 800 rpm for 1 h to 5 h. The product of the hydrothermal reaction is washed, filtered, and dried to obtain the light magnesium silicate-based filler. S2. Preparation of board-making slurry: uniformly mixing the light magnesium silicate-based filler with magnesium sulfate, magnesium oxide, an inorganic filler, a setting agent, an organic functional additive, and water to obtain a board-making slurry; S3, slurry injection molding and slab preparation: injecting the slurry into the mold, curing and solidifying to obtain the glass magnesium board slab; S4. The glass magnesium board blank is dried, sanded and cut to obtain the lightweight glass magnesium board.

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