A method for preparing a composite titanium extraction tailings-based calcium silicate board and the calcium silicate board thereof.

Abstract

This invention relates to a method for preparing a composite titanium extraction tailings-based calcium silicate board and the calcium silicate board itself. Specifically, the method includes: obtaining composite titanium extraction tailings, silicate cement, siliceous raw materials, calcareous raw materials, and wood fiber; wet-mixing the obtained raw materials, controlling the liquid-to-raw material ratio at 0.5–0.8 and the wet-mixing time at 5–15 min to obtain a slurry; forming the obtained slurry into a wet blank using a slurry forming process; curing the wet blank at room temperature in a shaded area for 6–36 h to obtain a sample blank; and steam-curing the sample blank in a cement autoclave, controlling the steam-curing temperature at 120–200℃ and the steam-curing time at 4–12 h to obtain the composite titanium extraction tailings-based calcium silicate board. In this invention, the amount of composite titanium extraction tailings is higher than 40%, which not only solves the problem of large-scale stockpiling of titanium extraction tailings but also significantly reduces raw material costs and increases enterprise profits.

Description

Technical Field

[0001] This invention relates to the field of metallurgical environmental protection technology, and in particular to a method for preparing a composite titanium extraction tailings-based calcium silicate board and the calcium silicate board itself. Background Technology

[0002] Titanium resources are an important strategic metal in my country. During the blast furnace smelting of vanadium-titanium magnetite, a large amount of titanium-containing blast furnace slag is generated. The high-temperature carbonization-low-temperature selective chlorination process is the main means of efficiently recovering titanium components from titanium-containing blast furnace slag. However, during the recovery process, about 80% of titanium-containing blast furnace slag is converted into secondary solid waste—titanium extraction tailings. Taking Panzhihua Iron and Steel Group as an example, processing 1 ton of titanium-containing blast furnace slag will generate about 0.8 tons of titanium extraction tailings. Assuming that Panzhihua Iron and Steel Group processes 1.5 million tons of titanium-containing blast furnace slag annually, it will generate about 1.2 million tons of titanium extraction tailings annually. In addition to Ca, Si, Al, Ti and Fe components, titanium extraction tailings also contain about 3% chlorine. Due to its special chlorine content, the large-scale comprehensive application of titanium extraction tailings is limited. The accumulation of large amounts of titanium extraction tailings will lead to environmental pollution, occupation of arable land and increased tailings management costs.

[0003] Calcium silicate board is a versatile new building material with excellent properties such as light weight, good thermal insulation, fire resistance, water resistance, and long lifespan. It can be used as interior partitions and ceiling materials, decorative materials, and sound-absorbing and thermal-insulating materials, and is widely used in offices, hotels, and high-rise apartments. However, the traditional raw materials required for calcium silicate board production are mostly mineral slurries. With increasing demand for calcium silicate board materials, this industry will consume large amounts of mineral resources, hindering sustainable development. Furthermore, currently available calcium silicate boards are mainly made from quartz and lime powder, resulting in higher material costs. Summary of the Invention

[0004] (I) Technical Solution

[0005] The first aspect of this invention provides a method for preparing a composite titanium extraction tailings-based calcium silicate board, the method comprising:

[0006] S1. Obtaining raw materials:

[0007] To obtain composite titanium extraction tailings, silicate cement, siliceous raw materials, calcareous raw materials and wood fiber;

[0008] S2, Pulping:

[0009] The obtained raw materials are wet-mixed, with the ratio of liquid to raw materials controlled at 0.5 to 0.8 and the wet-mixing time controlled at 5 to 15 minutes to obtain a slurry;

[0010] S3, Molding:

[0011] The obtained slurry is then processed into a wet blank using a flow molding process.

[0012] The wet billet was placed in a shady place and cured at room temperature for 6–36 hours to obtain a sample billet;

[0013] S4. Steam pressure curing:

[0014] The sample blank was placed in a cement autoclave for autoclaving. The autoclaving temperature was controlled at 120-200℃ and the autoclaving time was controlled at 4-12h to obtain composite titanium tailings-based calcium silicate board.

[0015] Preferably, the titanium extraction tailings are obtained from composite materials:

[0016] The raw material residue of titanium extraction tailings is washed with water to obtain washed residue of titanium extraction tailings. The washing time is controlled to be 0-2 hours and the washing temperature is controlled to be 20-100℃.

[0017] The raw material residue of titanium extraction tailings is mixed with the washed residue of titanium extraction tailings to obtain composite titanium extraction tailings.

[0018] Preferably, the curing time of the wet blank at room temperature is controlled to be 6 to 36 hours.

[0019] Preferably, the raw material slag for titanium extraction comprises the following components in the specified grade ratios:

[0020] The grades of SiO2 are 20-30%, Al2O3 are 10-20%, CaO is 20-30%, Cl is 0.1-5%, Fe2O3 is 2-7%, MgO is 5-10%, and TiO2 is 10-15%.

[0021] The Cl content in the washed residue of titanium extraction tailings after water washing is 0.1-1.0%.

[0022] Preferably, the silicate cement contains 20-30% SiO2, 50-60% CaO, 5-10% MgO, and 5-15% Al2O3.

[0023] Preferably, the siliceous raw materials include one or more of quartz, diatomaceous earth, silica fume, and fly ash.

[0024] Preferably, the calcium-based raw materials include one or more of quicklime, white lime, hydrated lime, titanium gypsum, and carbide slag.

[0025] Preferably, the SiO2 content in the quartz is 95-99%, and the Al2O3 content is 1-5%.

[0026] The SiO2 content in diatomaceous earth is 90-95%, the Al2O3 content is 1-5%, and the CaO content is 0.5-2.5%.

[0027] The silica fume contains 92-99% SiO2, 0.5-2.5% Al2O3, and 0.5-2.5% CaO.

[0028] The grade of SiO2 in fly ash is 40-60%, the grade of Al2O3 is 20-40%, the grade of CaO is 1-10%, the grade of Fe2O3 is 1-5%, and the grade of MgO is 0.5-2.5%.

[0029] Preferably, the quicklime contains 1-5% SiO2, 1-5% Al2O3, 80-90% CaO, 1-5% Fe2O3, and 1-5% MgO.

[0030] The grade of SiO2 in quicklime is 1-3%, the grade of Al2O3 is 1-3%, the grade of CaO is 60-90%, and the grade of MgO is 1-3%.

[0031] The SiO2 content in slaked lime is 1-3%, the CaO content is 60-95%, the Fe2O3 content is 1-3%, and the MgO content is 1-5%.

[0032] The titanium gypsum contains 1-10% SiO2, 10-30% Al2O3, 20-40% CaO, 10-25% Fe2O3, and 30-40% SO3.

[0033] The grade of SiO2 in carbide slag is 5-20%, the grade of Al2O3 is 5-15%, the grade of CaO is 50-80%, the grade of Fe2O3 is 1-5%, and the grade of MgO is 5-10%.

[0034] The second aspect of this application provides a composite titanium extraction tailings-based calcium silicate board, which is prepared by the method for preparing the composite titanium extraction tailings-based calcium silicate board proposed in any one of the first aspects above.

[0035] (III) Beneficial Effects

[0036] The beneficial effects of this invention are as follows: The method for preparing a composite titanium extraction tailings-based calcium silicate board utilizes composite titanium extraction tailings to prepare the board. Compared with traditional calcium silicate boards, the composite titanium extraction tailings-based calcium silicate board prepared by this invention meets the requirements of the national standard JC / T64.1-2008 "Fiber Reinforced Calcium Silicate Board (Part 1: Asbestos-Free Calcium Silicate Board)", and its comprehensive material performance is superior to that of traditional calcium silicate board materials. Composite titanium extraction tailings are a unique metallurgical solid waste resource in the titanium extraction process of steel enterprises, with silicon and calcium content exceeding 50%. It can be fully utilized as an effective component in the composite titanium extraction tailings-based calcium silicate board. In this invention, the amount of composite titanium extraction tailings exceeds 40%, which not only solves the problem of large-scale stockpiling of titanium extraction tailings but also significantly reduces raw material costs and increases enterprise profits. When the amount of composite titanium extraction tailings in the prepared composite titanium extraction tailings-based calcium silicate board exceeds 40%, the material raw material cost will be reduced by about half.

[0037] Compared with traditional titanium extraction tailings utilization processes, this invention has advantages such as high overall utilization rate of titanium extraction tailings, low energy consumption in the production process, low carbon emissions, and low production costs. Therefore, this invention has the potential for large-scale industrial development of utilizing chlorine-containing titanium extraction tailings and is one of the important technical supports for realizing diversified utilization of titanium extraction tailings. Attached Figure Description

[0038] Figure 1 This is a flowchart illustrating the preparation method of a composite titanium extraction tailings-based calcium silicate board according to the present invention. Detailed Implementation

[0039] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] When a quantity, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pair of any upper or preferred value with any lower or preferred value, regardless of whether the range is disclosed individually. For example, when the range “1–5” is disclosed, the described range should be interpreted as including ranges “1–4”, “1–3”, “1–2”, “1–2 and 4–5”, “1–3 and 5”, etc. When numerical ranges are described herein, unless otherwise stated, the range is intended to include its endpoints and all integers and fractions within that range.

[0041] In these embodiments, unless otherwise specified, all parts and percentages are expressed by mass. A “part by mass” refers to a basic unit of measurement representing the mass ratio of multiple components. One part can represent any unit mass, such as 1 g or 3.527 g. If we say that component A has a parts by mass and component B has b parts by mass, it means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, it can mean that the mass of component A is aK and the mass of component B is bK (K is any number representing a multiplier). It should not be misunderstood that, unlike parts by mass, the sum of the parts by mass of all components is not limited to 100 parts. “And / or” is used to indicate that one or both of the described situations may occur; for example, A and / or B includes (A and B) and (A or B).

[0042] The first aspect of this invention provides a method for preparing a composite titanium extraction tailings-based calcium silicate board, referring to... Figure 1 The above methods include:

[0043] Example 1:

[0044] S1. Obtaining raw materials:

[0045] To obtain composite titanium extraction tailings, silicate cement, siliceous raw materials, calcareous raw materials and wood fiber;

[0046] The raw material residue of titanium extraction tailings is stirred in water at 80℃ for 60 minutes to obtain the water-washed residue of titanium extraction tailings.

[0047] S2, Pulping:

[0048] Weigh the composite titanium extraction tailings, silicate cement, wood fiber, siliceous raw materials, and calcareous raw materials according to the specified proportions. The siliceous raw materials include one or more of quartz, diatomaceous earth, silica fume, and fly ash, while the calcareous raw materials include one or more of quicklime, white lime, hydrated lime, titanium gypsum, and carbide slag. Place the weighed raw materials into a mixer for wet mixing, controlling the liquid-to-raw material ratio at 0.5, and the mixing time at 5 minutes to obtain a slurry. The composite titanium extraction tailings account for 70% of the total mass of the formula, of which the raw material residue of titanium extraction tailings accounts for 70%, and the water-washed residue of titanium extraction tailings accounts for 0%. In addition, silicate cement accounts for 15%, hydrated lime accounts for 2.5%, quartz accounts for 12%, and wood fiber accounts for 0.5%.

[0049] S3, Molding:

[0050] The obtained slurry is then processed into a wet blank using a flow molding process.

[0051] The wet billet was cured at room temperature for 18 hours to obtain a sample billet.

[0052] S4. Steam pressure curing:

[0053] The sample blank was placed in a cement autoclave for autoclaving. The autoclaving temperature was controlled at 180℃ and the autoclaving time was controlled at 8h. After the cement autoclave cooled to room temperature, it was taken out to obtain composite titanium tailings-based calcium silicate board.

[0054] The composite titanium extraction tailings-based calcium silicate board was cut using a cutting machine.

[0055] The bulk density of the composite titanium extraction tailings-based calcium silicate board is 1.64 g / cm³. 3 It has a porosity of 34.4%, a flexural strength of 11.0 MPa, a thermal shrinkage rate of 0.31%, and a thermal conductivity of 0.318 W / (m·K).

[0056] Example 2:

[0057] The difference from Example 1 is as follows:

[0058] The raw material residue of titanium extraction tailings was stirred in water at 60℃ for 120 minutes to obtain the water-washed residue of titanium extraction tailings; the composite titanium extraction tailings accounted for 40% of the total mass of the formula, of which the raw material residue of titanium extraction tailings accounted for 40% and the water-washed residue of titanium extraction tailings accounted for 0%; in addition, silicate cement accounted for 15%, quicklime accounted for 11.4%, quartz accounted for 10%, silica fume accounted for 3.6%, fly ash accounted for 17%, and wood fiber accounted for 3%.

[0059] The ratio of liquid to raw materials should be controlled at 0.8; the stirring time should be 15 minutes.

[0060] The wet blanks were cured at room temperature for 36 hours;

[0061] The sample blank was placed in a cement autoclave for autoclaving, and the autoclaving temperature was controlled at 140℃ for 12 hours.

[0062] The bulk density of the composite titanium extraction tailings-based calcium silicate board is 1.38 g / cm³. 3 It has a porosity of 52.4%, a flexural strength of 9.1 MPa, a thermal shrinkage rate of 0.14%, and a thermal conductivity of 0.245 W / (m·K).

[0063] Example 3:

[0064] The difference from Example 1 is as follows:

[0065] The raw material residue of titanium extraction tailings is stirred in water at 20℃ for 120 minutes to obtain the water-washed residue of titanium extraction tailings; the composite titanium extraction tailings account for 50% of the total mass of the formula, of which the raw material residue of titanium extraction tailings accounts for 40% and the water-washed residue of titanium extraction tailings accounts for 10%; in addition, silicate cement accounts for 15%, quicklime accounts for 5%, hydrated lime accounts for 5%, quartz accounts for 10%, diatomaceous earth accounts for 10%, and wood fiber accounts for 5%.

[0066] The ratio of liquid to raw materials should be controlled at 0.7; the stirring time should be 10 minutes.

[0067] Curing the wet blanks at room temperature for 24 hours;

[0068] The sample blank was placed in a cement autoclave for autoclaving, and the autoclaving temperature was controlled at 200℃ for 6 hours.

[0069] The bulk density of the composite titanium extraction tailings-based calcium silicate board is 1.32 g / cm³. 3 It has a porosity of 38.4%, a flexural strength of 8.2 MPa, a thermal shrinkage rate of 0.27%, and a thermal conductivity of 0.288 W / (m·K).

[0070] Example 4:

[0071] The difference from Example 1 is as follows:

[0072] The raw material residue of titanium extraction tailings is stirred in water at 20℃ for 20 minutes to obtain the water-washed residue of titanium extraction tailings; the composite titanium extraction tailings account for 60% of the total mass of the formula, of which the raw material residue of titanium extraction tailings accounts for 20% and the water-washed residue of titanium extraction tailings accounts for 40%; in addition, silicate cement accounts for 15%, titanium gypsum accounts for 5%, quartz accounts for 5%, diatomaceous earth accounts for 10%, and wood fiber accounts for 5%.

[0073] The ratio of liquid to raw materials should be controlled at 0.6; the stirring time should be 15 minutes.

[0074] Curing the wet blanks at room temperature for 6 hours;

[0075] The sample blank was placed in a cement autoclave for autoclaving, and the autoclaving temperature was controlled at 180℃ for 8 hours.

[0076] The bulk density of the composite titanium extraction tailings-based calcium silicate board is 1.47 g / cm³. 3 It has a porosity of 45.4%, a flexural strength of 9.8 MPa, a thermal shrinkage rate of 0.12%, and a thermal conductivity of 0.279 W / (m·K).

[0077] Example 5:

[0078] The difference from Example 1 is as follows:

[0079] The raw material slag of titanium extraction tailings was stirred in water at 40℃ for 60 minutes to obtain the water-washed slag of titanium extraction tailings; the composite titanium extraction tailings accounted for 40% of the total mass of the formula, of which the raw material slag of titanium extraction tailings accounted for 20% and the water-washed slag of titanium extraction tailings accounted for 20%; in addition, silicate cement accounted for 15%, quicklime accounted for 10%, calcium carbide slag accounted for 3.9%, quartz accounted for 8.1%, silica fume accounted for 5%, fly ash accounted for 10%, diatomaceous earth accounted for 5%, and wood fiber accounted for 3%.

[0080] The ratio of liquid to raw materials should be controlled at 0.7; the stirring time should be 8 minutes.

[0081] Curing the wet blanks at room temperature for 24 hours;

[0082] The sample blank was placed in a cement autoclave for autoclaving, and the autoclaving temperature was controlled at 200℃ for 12 hours.

[0083] The bulk density of the composite titanium extraction tailings-based calcium silicate board is 1.08 g / cm³. 3 It has a porosity of 53.6%, a flexural strength of 8.1 MPa, a thermal shrinkage rate of 0.13%, and a thermal conductivity of 0.175 W / (m·K).

[0084] The composite titanium tailings-based calcium silicate board produced by the above process meets the requirements of the national standard JC / T564.1-2008 "Fiber-reinforced calcium silicate board (Part 1: Asbestos-free calcium silicate board)" after testing, and its comprehensive material performance is superior to that of traditional calcium silicate board materials.

[0085] Composite titanium extraction tailings are a unique metallurgical solid waste resource in the titanium extraction process of steel enterprises. With a silicon and calcium content exceeding 50%, it can be fully utilized as an effective component in calcium silicate boards. In this invention, the composite titanium extraction tailings content exceeds 40%, which not only solves the problem of large-scale stockpiling of titanium extraction tailings but also significantly reduces raw material costs and increases enterprise profits. When the composite titanium extraction tailings content in the prepared composite titanium extraction tailings-based calcium silicate board exceeds 40%, the material cost will be reduced by about half, to approximately 0.6 yuan / m². 2 For example, if a company builds an annual production capacity of 5 million / m³ 2 The composite titanium tailings-based calcium silicate board production line will reduce raw material costs by about 3 million yuan per year, which can effectively improve the market competitiveness of related enterprises.

[0086] Washing the raw material slag for titanium extraction can effectively reduce its chlorine content and increase its service life. This technology has important practical value for improving the high-temperature carbonization-low-temperature selective chlorination clean titanium extraction process of titanium-containing blast furnace slag in my country and is conducive to the creation of "zero-waste cities".

[0087] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0088] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0089] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0090] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0091] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for preparing a composite titanium extraction tailings-based calcium silicate board, characterized in that, Specifically, the steps include the following: S1. Obtaining raw materials: To obtain composite titanium extraction tailings, silicate cement, siliceous raw materials, calcareous raw materials and wood fiber; The composite titanium extraction tailings are obtained by: washing the raw titanium extraction tailings with water to obtain washed titanium extraction tailings, controlling the washing time to be 0-2 hours and the washing temperature to be 20-100℃, and the Cl content in the washed titanium extraction tailings is 0.1-1.0%; mixing the raw titanium extraction tailings with the washed titanium extraction tailings to obtain composite titanium extraction tailings. By mass percentage, the raw material residue of titanium extraction tailings accounts for 20%, the washed residue of titanium extraction tailings accounts for 40%, silicate cement accounts for 15%, siliceous raw materials account for 15%, calcareous raw materials account for 5%, and wood fiber accounts for 5%. S2, Pulping: The obtained raw materials are wet-mixed, with the ratio of liquid to raw materials controlled at 0.5~0.8 and the wet-mixing time controlled at 5~15 minutes to obtain a slurry; S3, Molding: The obtained slurry is then processed into wet blanks using a flow molding process. Place the wet billet in a shady place and cure it at room temperature for 6~36 hours to obtain a sample billet; S4. Steam pressure curing: The sample blank was placed in a cement autoclave for autoclaving. The autoclaving temperature was controlled at 120~200℃ and the autoclaving time was controlled at 4~12h to obtain composite titanium tailings-based calcium silicate board.

2. The preparation method of the composite titanium extraction tailings-based calcium silicate board as described in claim 1, characterized in that: The curing time of wet blanks at room temperature should be controlled to be 6~36 hours.

3. The method for preparing the composite titanium extraction tailings-based calcium silicate board as described in claim 1, characterized in that: The raw material residue for titanium extraction tailings consists of the following components in the indicated grade ratios: The grades of SiO2 are 20-30%, Al2O3 is 10-20%, CaO is 20-30%, Cl is 0.1-5%, Fe2O3 is 2-7%, MgO is 5-10%, and TiO2 is 10-15%.

4. The method for preparing the composite titanium extraction tailings-based calcium silicate board as described in claim 1, characterized in that: The SiO2 content in silicate cement is 20-30%, the CaO content is 50-60%, the MgO content is 5-10%, and the Al2O3 content is 5-15%.

5. The method for preparing the composite titanium extraction tailings-based calcium silicate board as described in claim 1, characterized in that: Siliceous raw materials include one or more of the following: quartz, diatomaceous earth, silica fume, and fly ash.

6. The method for preparing the composite titanium extraction tailings-based calcium silicate board as described in claim 1, characterized in that: Calcium-based raw materials include one or more of quicklime, white lime, hydrated lime, titanium gypsum, and carbide slag.

7. The method for preparing the composite titanium extraction tailings-based calcium silicate board as described in claim 5, characterized in that: The SiO2 content in quartz is 95-99%, and the Al2O3 content is 1-5%. The SiO2 content in diatomaceous earth is 90-95%, the Al2O3 content is 1-5%, and the CaO content is 0.5-2.5%. The silica fume contains 92-99% SiO2, 0.5-2.5% Al2O3, and 0.5-2.5% CaO. The grade of SiO2 in fly ash is 40-60%, the grade of Al2O3 is 20-40%, the grade of CaO is 1-10%, the grade of Fe2O3 is 1-5%, and the grade of MgO is 0.5-2.5%.

8. The method for preparing the composite titanium extraction tailings-based calcium silicate board as described in claim 6, characterized in that: The grade of SiO2 in quicklime is 1-5%, the grade of Al2O3 is 1-5%, the grade of CaO is 80-90%, the grade of Fe2O3 is 1-5%, and the grade of MgO is 1-5%. The content of SiO2 in quicklime is 1-3%, the content of Al2O3 is 1-3%, the content of CaO is 60-90%, and the content of MgO is 1-3%. The content of SiO2 in slaked lime is 1-3%, the content of CaO is 60-95%, the content of Fe2O3 is 1-3%, and the content of MgO is 1-5%. The titanium gypsum contains 1-10% SiO2, 10-30% Al2O3, 20-40% CaO, 10-25% Fe2O3, and 30-40% SO3. The grade of SiO2 in carbide slag is 5~20%, the grade of Al2O3 is 5~15%, the grade of CaO is 50~80%, the grade of Fe2O3 is 1~5%, and the grade of MgO is 5~10%.

9. A composite titanium extraction tailings-based calcium silicate board, characterized in that: The composite titanium extraction tailings-based calcium silicate board was prepared using any one of the preparation methods described in 1 to 8.

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