Preparation method of composite high-strength non-dismantling building template

Abstract

The invention relates to the technical field of building materials, and discloses a preparation method of a composite high-strength non-dismantling building template, which comprises the following steps: preparing titanium extraction tailings, and grinding and activating the titanium extraction tailings; the activated chlorine-containing titanium extraction tailings, lime and water are subjected to first mixing and stirring, then Portland cement is added for second mixing and stirring, then wood fibers are added for third mixing and stirring, finally sodium aluminate, a polycarboxylate superplasticizer and polypropylene fibers are added for fourth mixing and stirring, and mixed slurry is obtained; the mixed slurry is subjected to roll forming and curing, and the composite high-strength non-dismantling building formwork is obtained. According to the method, the chlorine-containing titanium extraction tailings are ground to prepare the 75-grade chlorine-containing titanium extraction tailings, the specific surface area of the titanium extraction tailings can be further increased, the titanium extraction tailings are promoted to react with an alkali solution to generate a gelatinization system, the industrial solid waste titanium extraction tailings and forestry waste wood chips are cooperatively utilized to prepare the high-strength wood chip non-dismantling building formwork, and cooperative utilization of waste resources is achieved.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, and in particular to a method for preparing a composite high-strength, non-removable building formwork. Background Technology

[0002] Chlorine-containing titanium extraction tailings are a large quantity of industrial solid waste generated from titanium-containing blast furnace slag after high-temperature carbonization and low-temperature chlorination to extract titanium components. Its main problems lie in its high chloride ion content (typically 3%–5%) and low cementitious activity. According to national standard methods, its 28-day activity index is only about 52.6%, far below the requirements for use as a high-quality concrete admixture. This low activity, coupled with the risk of chloride ions corroding steel reinforcement, severely limits its large-scale application in building materials, resulting in a large amount of tailings being stockpiled for disposal, leading to a heavy environmental burden and resource waste.

[0003] On the other hand, cement-based composite materials, with wood chips as the main raw material, are considered an important development direction for green building materials due to their excellent thermal insulation, sound insulation, and environmental protection properties. However, according to the industry standard JC / T 411-2007, the saturated flexural strength of traditional cement-wood chipboard is only required to be no less than 5.5 MPa. This strength level is clearly insufficient for prefabricated building components used as permanent formwork or structural members, resulting in problems such as low strength and large shrinkage deformation, which restricts its widespread application in scenarios with higher performance requirements. Currently, the building formwork market still widely relies on wooden or steel formwork. Wooden formwork consumes a large amount of timber resources, which contradicts the concept of sustainable development; steel formwork is expensive and heavy.

[0004] Therefore, there is a need to improve the preparation method of composite high-strength non-removable building formwork in the existing technology. Summary of the Invention

[0005] In view of this, the purpose of this invention is to propose a method for preparing composite high-strength, non-removable building templates. By grinding chlorine-containing titanium extraction tailings to prepare grade 75 chlorine-containing titanium extraction tailings, the specific surface area of ​​the titanium extraction tailings can be further increased, promoting its reaction with alkaline solution to generate a gelling system. Industrial solid waste titanium extraction tailings and forestry waste wood chips are used in synergistic utilization to prepare high-strength wood chip non-removable building templates, realizing the synergistic utilization of waste resources.

[0006] To achieve the above objectives, this invention provides a method for preparing composite high-strength, non-removable building formwork, comprising the following steps: S1 is preparing to extract titanium tailings, and will grind the titanium tailings to an activity index of 75 or higher. S2 involves first mixing the activated chlorine-containing titanium extraction tailings with lime and water, then adding silicate cement for second mixing, then adding wood fiber for third mixing, and finally adding sodium aluminate, polycarboxylate superplasticizer and polypropylene fiber for fourth mixing to obtain a mixed slurry. S3 rolls the mixed slurry into a template wet blank, and attaches multiple layers of mesh cloth to the surface of the template wet blank; S4 steam curing of wet template blanks yields composite high-strength, non-removable building templates.

[0007] In some embodiments, in S2, the ratio of milled and activated chlorine-containing titanium extraction tailings: silicate cement: lime is (40-50): (45-60): (0-5) by mass, and the water-cement ratio is 0.35~0.45:1.

[0008] In some embodiments, in S2, the mass of the added wood fiber is 5% to 15% of the total mass of the chlorinated titanium extraction tailings, silicate cement, and lime, and the length of each wood fiber is 1 to 20 mm.

[0009] In some embodiments, in S2, the amount of sodium aluminate added is 1% to 3% of the total mass of chlorine-containing titanium extraction tailings, silicate cement and lime, the amount of polycarboxylate superplasticizer added is 0.1%, and the amount of polypropylene fiber added is 1%.

[0010] In some embodiments, in S2, the first mixing and stirring time is 3 to 10 minutes; The second mixing time is 2-5 minutes; The third mixing time is 8-15 minutes; The fourth mixing time is 5-10 minutes.

[0011] In some embodiments, in step S3, 3 to 5 layers of mesh fabric are attached to the surface of the wet template blank. The mesh fabric has a mesh size of 2 to 5 mm and a basis weight of 50 to 80 g / cm³. 2 .

[0012] In some embodiments, in S4, the curing is steam curing, the curing temperature is 30°C to 60°C, the curing humidity is not less than 70%, and the curing time is 1 to 5 days.

[0013] In some embodiments, the composition of the chlorine-containing titanium extraction tailings, by mass percentage, includes: SiO2: 25-30%; CaO: 25-30%; MgO: 5-10%; Al2O3: 10-20%; TiO2: 7-13%; Fe2O3: 2-5%; CaCl2: 1-2%; MgCl2: 1-1.5%; MnCl2: 1-1.5%.

[0014] In some embodiments, the silicate cement has a strength grade of 42.5 by mass percentage, wherein the SiO2 content is 20-30%, the CaO content is 45-65%, and the Al2O3 content is 5-15%.

[0015] In some embodiments, the lime contains 1-3% SiO2, 90-95% CaO, and 0.1-1% Fe2O3 by mass percentage.

[0016] The present invention has at least the following beneficial technical effects: 1. Compared with the performance of traditional cement wood chipboard, the saturated flexural strength of composite high-strength non-removable building formwork is increased by 1.6 to 3 times, achieving an innovative breakthrough in the application of traditional cement wood chipboard in the field of prefabricated construction; 2. Low-cost, high-strength, non-removable composite building formwork: This invention introduces an innovative formulation for the composite high-strength, non-removable building formwork. Through a grinding process, the pozzolanic activity of the chlorine-containing titanium extraction tailings is increased to level 75. The formulation contains 40% to 50% chlorine-containing titanium extraction tailings, effectively reducing cement usage and meeting the national concept of low-carbon and green building materials development. 3. Adding sodium aluminate as an additive promotes the formation of Friedel salt in the composite high-strength, non-removable building template, increasing the sample's chlorine fixation capacity by 10-20%. This invention relates to the synergistic application of chlorine-containing titanium extraction tailings and wood chips, a composite high-strength, non-removable building template, and its preparation method. The composite high-strength, non-removable building template prepared by this method improves the mechanical properties of traditional wood chip cement boards and can be applied in the field of prefabricated buildings, opening up a new avenue for the synergistic high-value utilization of chlorine-containing titanium extraction tailings and wood chip waste. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of an embodiment of the method for preparing composite high-strength, non-removable building formwork provided by the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.

[0020] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion; the terms "first," "second," etc., used in the specification, claims, and accompanying drawings are used to distinguish different objects, not to describe a particular order. "A plurality of" means two or more, unless otherwise explicitly specified.

[0021] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] like Figure 1 The diagram shown is a schematic representation of an embodiment of the method for preparing composite high-strength, non-removable building formwork provided by the present invention, including: S1 is preparing to extract titanium tailings, and will grind the titanium tailings to an activity index of 75 or higher. S2 involves first mixing the activated chlorine-containing titanium extraction tailings with lime and water, then adding silicate cement for second mixing, then adding wood fiber for third mixing, and finally adding sodium aluminate, polycarboxylate superplasticizer and polypropylene fiber for fourth mixing to obtain a mixed slurry. S3 rolls the mixed slurry into a template wet blank, and attaches multiple layers of mesh cloth to the surface of the template wet blank; S4 steam curing of wet template blanks yields composite high-strength, non-removable building templates.

[0023] The following ingredients are weighed: titanium extraction tailings, 42.5 silicate cement, lime, wood fiber, polypropylene fiber, aluminum sulfate, and polycarboxylate superplasticizer. The titanium extraction tailings are ground until the activity index reaches 75 or higher, and are then called grade 75 chlorine-containing titanium extraction tailings.

[0024] Further, in S2, the mass ratio of the ground and activated chlorine-containing titanium extraction tailings: silicate cement: lime is (40-50):(45-60):(0-5), and the water-cement ratio is 0.35~0.45:1. Preferably, the mass ratio of 75-grade chlorine-containing titanium extraction tailings: 42.5 silicate cement to lime can be 40:60:0, 40:57.5:2.5, 40:55:5, 50:50:0, 50:47.5:2.5, and 50:45:5, respectively.

[0025] The added wood fibers account for 5% to 15% of the total mass of chlorinated titanium extraction tailings, silicate cement, and lime, and each wood fiber has a length of 1 to 20 mm.

[0026] The amount of sodium aluminate added is 1% to 3% of the total mass of chlorine-containing titanium extraction tailings, silicate cement and lime, the amount of polycarboxylate superplasticizer added is 0.1%, and the amount of polypropylene fiber added is 1%.

[0027] The first mixing time is 3-10 minutes; the second mixing time is 2-5 minutes; the third mixing time is 8-15 minutes; and the fourth mixing time is 5-10 minutes. Preferably, 75-grade chlorine-containing titanium extraction tailings and lime are added to a horizontal mixer and mixed for 5 minutes. Water is added at a water-cement ratio of 0.35-0.45 and mixed for 3 minutes. 42.5 silicate cement is added and mixed for 3 minutes to ensure uniform mixing of the slurry. Then, 5-15% wood fiber is added and mixed for 10 minutes. Next, 1-3% sodium aluminate, 0.1% polycarboxylate superplasticizer, and 1% polypropylene fiber are added and mixed for 8 minutes to obtain the slurry. The polypropylene fiber has a length of 5-20 mm.

[0028] The composition of the chlorine-containing titanium extraction tailings, by mass percentage, is shown in Table 1: Table 1. Main components (%) of chlorine-containing titanium extraction tailings

[0029] By mass percentage, the strength grade of silicate cement is 42.5, with SiO2 content of 20-30%, CaO content of 45-65%, and Al2O3 content of 5-15%.

[0030] By mass percentage, the grade of SiO2 in lime is 1~3%, the grade of CaO is 90~95%, and the grade of Fe2O3 is 0.1~1%.

[0031] Furthermore, in S3, 3-5 layers of mesh fabric are attached to the surface of the wet template blank. The mesh fabric has a mesh size of 2-5 mm and a basis weight of 50-80 g / cm³. 2 .

[0032] The principle of the method of this invention is: 1. By using the calcium chloride component in titanium extraction tailings and the calcium oxide component in lime to treat wood chips, the wood material treated with alkaline media can resist bacterial and fungal erosion, and will not be infested with insects or rot.

[0033] 2. The raw titanium extraction tailings containing chlorine have a low activity index and are mainly used as fillers. After grinding, they become grade 75 titanium extraction tailings containing chlorine, which can further increase the specific surface area of ​​the titanium extraction tailings and promote their reaction with alkaline solutions to form a gelling system.

[0034] 3. Adding sodium aluminate can increase the aluminum content in the formula. As the aluminum ion content in the solution increases, Al... 3+ Able to gradually replace Si 4+ Formation of aluminum-oxygen tetrahedra ([AlO4)) 5- Aluminum oxide tetrahedra and silicon oxide tetrahedra enter the broken silicon oxide chains, transforming short chains into long chains. Water molecules diffuse around the defects in the silicon oxide chains and form hydrogen ions and hydroxide ions through hydrogen bond adsorption-dissociation. Hydrogen ions combine with non-bridging oxygen bonds in the Si-O bonds to form Si-OH groups, while the ionized hydroxide ions coordinate with interlayer calcium ions to form Ca-OH groups. The adsorption of chloride ions by hydrated calcium silicate (aluminate) gel mainly occurs through ≡SiOCa + The ≡SiOH group combines with chloride ions to form ≡SiOCaCl and ≡SiOCl. 2- Furthermore, the addition of aluminum ions can further chemically combine with chloride ions (4CaCl2+2NaAlO2+14H2O=3CaO·Al2O3·CaCl2·10H2O+2NaCl) to generate Friedel salt, thereby improving the material's chloride fixation capacity.

[0035] The beneficial effects of this invention are: 1. Compared with traditional cement-based wood chipboard, the composite high-strength, non-removable building formwork exhibits 1.6 to 3 times higher saturated flexural strength. This represents an innovative breakthrough in the application of traditional cement-based wood chipboard in prefabricated construction.

[0036] 2. Low-cost, high-strength, non-removable composite building formwork. This invention introduces an innovative formulation for the composite high-strength, non-removable building formwork. Through a grinding process, the pozzolanic activity of the chlorine-containing titanium extraction tailings is increased to level 75. The formulation contains 40% and 50% chlorine-containing titanium extraction tailings, effectively reducing the amount of 42.5 cement used and meeting the national concept of low-carbon and green building materials development.

[0037] 3. Adding sodium aluminate as an additive promotes the formation of Friedel salt in the composite high-strength, non-removable building template. Compared with the patent literature "Application of Titanium Extraction Tailings, Lightweight Non-removable Building Template and its Preparation Method", the chlorine fixation capacity of the sample is increased by 10-20%. This invention relates to the synergistic application of chlorinated titanium extraction tailings and wood chips, the composite high-strength, non-removable building template and its preparation method. The composite high-strength, non-removable building template prepared by this method improves the mechanical properties of traditional wood chip cement boards and can be applied in the field of prefabricated buildings, opening up a new avenue for the synergistic high-value utilization of chlorinated titanium extraction tailings and wood chip waste.

[0038] The present invention will be further explained and illustrated by the following examples, but not limited thereto.

[0039] To better explain and facilitate understanding of the present invention, a detailed description of the invention will be provided through specific embodiments.

[0040] 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).

[0041] Example 1 S1. Weigh the titanium extraction tailings, silicate cement, lime, wood fiber, polypropylene fiber, aluminum sulfate, and polycarboxylate superplasticizer according to the formula design. Grind the titanium extraction tailings to achieve an activity index of 75.

[0042] S2 and 75 grade titanium extraction tailings: The mass ratio of silicate cement to lime is 40:60:0. The water-cement ratio is 0.45.

[0043] Add 75-grade chlorine-containing titanium extraction tailings and lime to a horizontal mixer and continue mixing for 5 minutes. Add water at a water-cement ratio of 0.45 and mix for 3 minutes. Add 42.5 silicate cement and mix for 3 minutes to ensure the slurry is uniformly mixed. Then, add 5% wood fiber and mix for 10 minutes. Next, add 1% sodium aluminate, 0.1% polycarboxylate superplasticizer, and 1% polypropylene fiber, and mix for 8 minutes to obtain the slurry.

[0044] S3. Roll press the obtained mixed slurry into a template wet blank, and attach 3 layers of mesh cloth to the surface of the wet blank.

[0045] S4. Place the wet template blank into a steam curing chamber for curing for 1 day to obtain a high-strength building template based on chlorine-containing titanium tailings and wood chips.

[0046] The lightweight, non-removable building formwork containing titanium extraction tailings has a saturated flexural strength of 11.5 MPa and a bulk density of 1.42 g / cm³. 3 Impact strength 1.8 KJ / m 2 The chlorine fixation efficiency is 50%.

[0047] Example 2 S1. Weigh the titanium extraction tailings, silicate cement, lime, wood fiber, polypropylene fiber, aluminum sulfate, and polycarboxylate superplasticizer according to the formula design. Grind the titanium extraction tailings to achieve an activity index of 75.

[0048] S2 and 75 grade titanium extraction tailings: The mass ratio of silicate cement to lime is 40:57.5:2.5. The water-cement ratio is 0.35.

[0049] Add 75-grade chlorine-containing titanium extraction tailings and lime to a horizontal mixer and continue mixing for 5 minutes. Add water at a water-cement ratio of 0.35 and mix for 3 minutes. Add 42.5 silicate cement and mix for 3 minutes to ensure the slurry is uniformly mixed. Then, add 10% wood fiber and mix for 10 minutes. Next, add 2% sodium aluminate, 0.1% polycarboxylate superplasticizer, and 1% polypropylene fiber, and mix for 8 minutes to obtain the slurry.

[0050] S3. Roll press the obtained mixed slurry into a template wet blank, and attach 5 layers of mesh cloth to the surface of the wet blank.

[0051] S4. Place the wet template blank into a steam curing chamber for curing for 2 days to obtain a high-strength building template based on chlorine-containing titanium tailings and wood chips.

[0052] The lightweight, non-removable building formwork containing titanium extraction tailings has a saturated flexural strength of 16.5 MPa and a bulk density of 1.34 g / cm³. 3 Impact strength 3.5 KJ / m 2 The chlorine fixation efficiency is 67%.

[0053] Example 3 S1. Weigh the titanium extraction tailings, silicate cement, lime, wood fiber, polypropylene fiber, aluminum sulfate, and polycarboxylate superplasticizer according to the formula design. Grind the titanium extraction tailings to achieve an activity index of 75.

[0054] S2 and 75 grade titanium extraction tailings: Silicate cement to lime mass ratio is 40:55:5. Water-cement ratio is 0.40.

[0055] Add 75-grade chlorine-containing titanium extraction tailings and lime to a horizontal mixer and continue mixing for 5 minutes. Add water at a water-cement ratio of 0.40 and mix for 3 minutes. Add 42.5 silicate cement and mix for 3 minutes to ensure the slurry is uniformly mixed. Then, add 15% wood fiber and mix for 10 minutes. Next, add 3% sodium aluminate, 0.1% polycarboxylate superplasticizer, and 1% polypropylene fiber, and mix for 8 minutes to obtain the slurry.

[0056] S3. Roll press the obtained mixed slurry into a template wet blank, and attach 4 layers of mesh cloth to the surface of the wet blank.

[0057] S4. Place the wet template blank into a steam curing chamber for curing for 3 days to obtain a high-strength building template based on chlorine-containing titanium tailings and wood chips.

[0058] The lightweight, non-removable building formwork containing titanium extraction tailings has a saturated flexural strength of 13.0 MPa and a bulk density of 1.30 g / cm³. 3 Impact strength 2.6 KJ / m 2 The chlorine fixation efficiency is 64%.

[0059] Example 4 S1. Weigh the titanium extraction tailings, silicate cement, lime, wood fiber, polypropylene fiber, aluminum sulfate, and polycarboxylate superplasticizer according to the formula design. Grind the titanium extraction tailings to achieve an activity index of 75.

[0060] S2 and 75 grade titanium extraction tailings: The mass ratio of silicate cement to lime is 50:50:0. The water-cement ratio is 0.45.

[0061] Add 75-grade chlorine-containing titanium extraction tailings and lime to a horizontal mixer and continue mixing for 5 minutes. Add water at a water-cement ratio of 0.45 and mix for 3 minutes. Add 42.5 silicate cement and mix for 3 minutes to ensure the slurry is uniformly mixed. Then, add 5% wood fiber and mix for 10 minutes. Next, add 2% sodium aluminate, 0.1% polycarboxylate superplasticizer, and 1% polypropylene fiber, and mix for 8 minutes to obtain the slurry.

[0062] S3. Roll press the obtained mixed slurry into a template wet blank, and attach 3 layers of mesh cloth to the surface of the wet blank.

[0063] S4. Place the wet template blank into a steam curing chamber for curing for 5 days to obtain a high-strength building template based on chlorine-containing titanium tailings and wood chips.

[0064] The lightweight, non-removable building formwork containing titanium extraction tailings has a saturated flexural strength of 10.7 MPa and a bulk density of 1.47 g / cm³. 3 Impact strength 2.0 KJ / m 2 The chlorine fixation efficiency is 52%.

[0065] Example 5 S1. Weigh the titanium extraction tailings, silicate cement, lime, wood fiber, polypropylene fiber, aluminum sulfate, and polycarboxylate superplasticizer according to the formula design. Grind the titanium extraction tailings to achieve an activity index of 75.

[0066] S2 and 75 grade titanium extraction tailings: The mass ratio of silicate cement to lime is 50:47.5:2.5. The water-cement ratio is 0.45.

[0067] Add 75-grade chlorine-containing titanium extraction tailings and lime to a horizontal mixer and continue mixing for 5 minutes. Add water at a water-cement ratio of 0.45 and mix for 3 minutes. Add 42.5 silicate cement and mix for 3 minutes to ensure the slurry is uniformly mixed. Then, add 10% wood fiber and mix for 10 minutes. Next, add 2% sodium aluminate, 0.1% polycarboxylate superplasticizer, and 1% polypropylene fiber, and mix for 8 minutes to obtain the slurry.

[0068] S3. Roll press the obtained mixed slurry into a template wet blank, and attach 5 layers of mesh cloth to the surface of the wet blank.

[0069] S4. Place the wet template blank into a steam curing chamber for curing for 3 days to obtain a high-strength building template based on chlorine-containing titanium tailings and wood chips.

[0070] The lightweight, non-removable building formwork containing titanium extraction tailings has a saturated flexural strength of 14.7 MPa and a bulk density of 1.36 g / cm³. 3 Impact strength 3.20 KJ / m 2 The chlorine fixation efficiency is 65%.

[0071] Example 6 S1. Weigh the titanium extraction tailings, silicate cement, lime, wood fiber, polypropylene fiber, aluminum sulfate, and polycarboxylate superplasticizer according to the formula design. Grind the titanium extraction tailings to achieve an activity index of 75.

[0072] S2 and 75 grade titanium extraction tailings: The mass ratio of silicate cement to lime is 50:45:5. The water-cement ratio is 0.40.

[0073] Add 75-grade chlorine-containing titanium extraction tailings and lime to a horizontal mixer and continue mixing for 10 minutes. Add water at a water-cement ratio of 0.40 and mix for 3 minutes. Add 42.5 silicate cement and mix for 3 minutes to ensure the slurry is uniformly mixed. Then, add 10% wood fiber and mix for 10 minutes. Next, add 1% sodium aluminate, 0.1% polycarboxylate superplasticizer, and 1% polypropylene fiber, and mix for 8 minutes to obtain the slurry.

[0074] S3. Roll press the obtained mixed slurry into a template wet blank, and attach 4 layers of mesh cloth to the surface of the wet blank.

[0075] S4. Place the wet template blank into a steam curing chamber for curing for 2 days to obtain a high-strength building template based on chlorine-containing titanium tailings and wood chips.

[0076] The lightweight, non-removable building formwork containing titanium extraction tailings has a saturated flexural strength of 12.6 MPa and a bulk density of 1.32 g / cm³. 3 Impact strength 2.5 KJ / m 2 The chlorine fixation efficiency is 62%.

[0077] This invention relates to the synergistic application of chlorinated titanium extraction tailings and wood chips, a composite high-strength, non-removable building template, and its preparation method. By grinding the chlorinated titanium extraction tailings to prepare grade 75 chlorinated titanium extraction tailings, the specific surface area of ​​the tailings can be further increased, promoting its reaction with alkaline solutions to form a gelling system. This invention primarily addresses the difficulty of applying chlorinated titanium extraction tailings in the building materials field. Through a series of technical measures, it synergistically utilizes industrial solid waste titanium extraction tailings with forestry waste wood chips to prepare high-strength, non-removable wood chip building templates, achieving the synergistic utilization of waste resources and meeting my country's green and low-carbon industry development concept. This invention is innovative and can be promoted and applied in Panzhihua Iron and Steel Group and other domestic industries, particularly in the field of chlorinated waste residue resource utilization. Furthermore, this invention analyzes and summarizes the process operation aspects, forming a method with certain operational techniques that can stably produce composite high-strength, non-removable building templates.

[0078] The above are exemplary embodiments disclosed in this invention. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments of this invention as defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.

[0079] It should be understood that, as used herein, the singular form “a” is intended to include the plural form as well, unless the context clearly supports an exception. It should also be understood that, as used herein, “and / or” refers to any and all possible combinations of one or more of the associated listed items.

[0080] The embodiment numbers disclosed in the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0081] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of different aspects of the invention exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A method for preparing a composite high-strength, non-removable building formwork, characterized in that, include: S1 prepares titanium extraction tailings and grinds the titanium extraction tailings to an activity index of 75 or higher. S2 involves first mixing the activated chlorine-containing titanium extraction tailings with lime and water, then adding silicate cement for second mixing, then adding wood fiber for third mixing, and finally adding sodium aluminate, polycarboxylate superplasticizer and polypropylene fiber for fourth mixing to obtain a mixed slurry. S3 roll-presses the mixed slurry into a template wet blank, and attaches multiple layers of mesh cloth to the surface of the template wet blank; S4 steam-cures the wet template blank to obtain a composite high-strength, non-removable building template.

2. The method for preparing composite high-strength, non-removable building formwork according to claim 1, characterized in that, In S2, by mass ratio, the ratio of chlorine-containing titanium extraction tailings after grinding and activation to silicate cement to lime is (40-50): (45-60): (0-5), and the water-cement ratio is 0.35~0.45:

1.

3. The method for preparing composite high-strength, non-removable building formwork according to claim 1, characterized in that, In S2, the mass of the added wood fiber is 5% to 15% of the total mass of the chlorine-containing titanium extraction tailings, silicate cement, and lime, and the length of each wood fiber is 1 to 20 mm.

4. The method for preparing composite high-strength, non-removable building formwork according to claim 1, characterized in that, In S2, the amount of sodium aluminate added is 1% to 3% of the total mass of the chlorine-containing titanium extraction tailings, silicate cement and lime, the amount of polycarboxylate superplasticizer added is 0.1%, and the amount of polypropylene fiber added is 1%.

5. The method for preparing composite high-strength, non-removable building formwork according to claim 1, characterized in that, In S2, the first mixing and stirring time is 3~10 min; The second mixing and stirring time is 2-5 minutes; The third mixing and stirring time is 8-15 minutes; The fourth mixing and stirring time is 5-10 minutes.

6. The method for preparing the composite high-strength, non-removable building formwork according to claim 1, characterized in that, In step S3, 3-5 layers of mesh fabric are attached to the surface of the wet template blank. The mesh fabric has a mesh size of 2-5 mm and a basis weight of 50-80 g / cm³. 2 .

7. The method for preparing composite high-strength, non-removable building formwork according to claim 1, characterized in that, In S4, the curing is steam curing, with a curing temperature of 30℃ to 60℃, a curing humidity of not less than 70%, and a curing time of 1 to 5 days.

8. The method for preparing composite high-strength, non-removable building formwork according to claim 1, characterized in that, The composition of the chlorine-containing titanium extraction tailings, by mass percentage, includes: SiO2: 25-30%; CaO: 25-30%; MgO: 5-10%; Al2O3: 10-20%; TiO2: 7-13%; Fe2O3: 2-5%; CaCl2: 1-2%; MgCl2: 1-1.5%; MnCl2: 1-1.5%.

9. The method for preparing composite high-strength, non-removable building formwork according to claim 1, characterized in that, The silicate cement has a strength grade of 42.5 by mass percentage, wherein the SiO2 content is 20-30%, the CaO content is 45-65%, and the Al2O3 content is 5-15%.

10. The method for preparing composite high-strength, non-removable building formwork according to claim 1, characterized in that, The lime contains 1-3% SiO2, 90-95% CaO, and 0.1-1% Fe2O3 by mass percentage.

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