Inorganic artificial stone and its preparation method and application

Abstract

The present invention discloses an inorganic artificial stone, its preparation method, and application. The preparation method comprises the following steps: S1. Mixing cement I, metakaolin I, dry tungsten tailings I, polymer emulsion I, water I, and water reducer I, pressing, steam curing, and crushing to obtain aggregate; S2. Mixing the aggregate prepared in step S1, cement II, metakaolin II, dry tungsten tailings II, polymer emulsion II, water II, and water reducer II, and subjecting the mixture to vibration pressing; S3. Steam curing the pressed product to obtain the inorganic artificial stone. The inorganic artificial stone prepared by the method of the present invention has low water absorption, a crushing value that meets the Class I crushing index, and, despite the large-scale use of tungsten tailings resources, high flexural strength.

Description

Technical Field

[0001] The present invention relates to the technical field of building decoration materials, in particular to an inorganic artificial stone and a preparation method and application thereof. Background Art

[0002] Artificial decorative aggregate is a decorative material with a wide range of applications. By incorporating colorants during the preparation process, it can achieve a variety of vibrant colors, making it an ideal material for public and private architectural decoration. Artificial board materials incorporating appropriate amounts of artificial decorative aggregate can be used to create indoor and outdoor floors, walls, exterior ventilation panels, window sills, and staircases, offering high quality and low cost.

[0003] The molding process of artificial decorative aggregates is mainly achieved through industrial granulation. From the perspective of process technology, it can be broadly divided into two categories. One is the molding method (pressure molding), which mainly processes the powdered material through specific equipment and pressure to form agglomerates of the required shape, composition, density, etc.; the other is the particle size enlargement method, which mainly agglomerates fine powder into coarser particles.

[0004] Tungsten tailings have a similar composition to various silicate-based building materials, primarily consisting of garnet, quartz, and clay minerals. They have the potential to be used in various building materials. However, tungsten tailings typically have a relatively large particle size and low potential for gelling activity, making their direct use in cementitious systems unlikely to positively impact their properties.

[0005] To address this issue, it is necessary to develop a method for preparing inorganic artificial stone with dense structure, low water absorption and low crushing value, and to achieve the goal of high-efficiency utilization of tungsten tailings and cost reduction and emission reduction. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, in a first aspect, the present invention provides a method for preparing an inorganic artificial stone, which can achieve high-efficiency utilization of tungsten tailings and has the effects of a dense structure, low water absorption rate, and low crushing value.

[0007] The second aspect of the present invention further provides an inorganic artificial stone.

[0008] The third aspect of the present invention further provides an application of inorganic artificial stone.

[0009] According to a first aspect of the present invention, a method for preparing an inorganic artificial stone is provided, comprising the following steps:

[0010] S1. Cement I, metakaolin I, tungsten tailings dry material I, polymer emulsion I, water I, and water reducer I are mixed, pressed, steamed, and crushed to obtain aggregate;

[0011] S2, mixing the aggregate prepared in step S1, cement II, metakaolin II, tungsten tailings dry material II, polymer emulsion II, water II and water reducer II and performing vibration pressing treatment;

[0012] S3. Steaming the pressed product to obtain inorganic artificial stone.

[0013] The inorganic artificial stone according to the embodiment of the present invention has at least the following beneficial effects:

[0014] The present invention first prepares aggregate by mixing cement I, metakaolin I, tungsten tailings dry material I, polymer emulsion I, water I and water reducer I, pressing, steaming and crushing the aggregate. The aggregate has low water absorption and its crushing value reaches a Class I crushing index. Then, the aggregate is mixed with other raw materials such as tungsten tailings to prepare inorganic artificial stone. The inorganic artificial stone has high flexural strength while using a large amount of tungsten tailings resources.

[0015] According to some embodiments of the present invention, the particle size of the aggregate ranges from 4.75 mm to 9.50 mm.

[0016] According to some embodiments of the present invention, in step S3, the steaming temperature is 70-100°C.

[0017] According to some embodiments of the present invention, in step S3, the steaming time is 48 to 72 hours.

[0018] According to some embodiments of the present invention, it includes the following components calculated in parts by weight:

[0019]

[0020] According to some embodiments of the present invention, the raw materials for preparing the aggregate include the following components calculated in parts by weight:

[0021]

[0022] According to some embodiments of the present invention, the tungsten tailings dry material I and the tungsten tailings dry material II are independently selected from two particle size combinations of mesh size greater than 80 mesh and mesh size within the range of 28 to 80 mesh.

[0023] According to some embodiments of the present invention, the tungsten tailings dry material I and the tungsten tailings dry material II are subjected to the steps of dehydration, drying and classification screening.

[0024] According to some embodiments of the present invention, the water reducer I and the water reducer II are independently selected from at least one of a sulfonate water reducer, a polycarboxylic acid water reducer, an aliphatic water reducer or a polyoxyethylene water reducer.

[0025] According to some embodiments of the present invention, the polymer emulsion I and polymer emulsion II are independently selected from at least one of styrene-butadiene latex, styrene-acrylic latex, pure acrylic latex or acrylic emulsion.

[0026] According to some embodiments of the present invention, in step S2, the vibration pressing conditions are as follows: a vacuum degree of 0.08 to 0.12 MPa, a cylinder pressure of 0.2 to 0.4 MPa, and a pressing vibration time of 100 to 120 s.

[0027] According to some embodiments of the present invention, the vibration pressing process in step S2 further includes a shaping process.

[0028] According to some embodiments of the present invention, the shaping treatment is performed under the following conditions: a temperature of 20-25° C. and a humidity of 90-95% for 24-48 hours.

[0029] According to a second aspect of the present invention, an embodiment provides an inorganic artificial stone prepared by the above-mentioned preparation method.

[0030] A third aspect of the present invention provides the use of the above-mentioned inorganic artificial stone in decorative building materials.

[0031] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention. DETAILED DESCRIPTION

[0032] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the embodiments, but the present invention is not limited to these embodiments.

[0033] Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the art.

[0034] Tungsten tailings are taken from Xintianling; the tungsten tailings slurry is clarified, and then the clarified muddy tungsten tailings are placed in a 120℃ oven and dried for 24 hours until they are completely dry. The dried tungsten tailings raw materials are sieved through a multi-stage vibrating screen to obtain tungsten tailings particles of different particle size ranges (fine tungsten tailings particles with a mesh size greater than 80 mesh and coarse tungsten tailings particles with a mesh size range of 28 to 140 mesh).

[0035] The cement is Hunan Chenzhou Liangtian PO42.5 cement; the water reducer is purchased from Guangdong Hongqiang New Materials Co., Ltd., model CSP-13, with a solid content of 35%; the polymer emulsion is Xinsu Teng industrial grade styrene butadiene latex; the water is tap water or drinking water, which meets the requirements of the "Standard for Water Use in Concrete" (JGJ63-2006).

[0036] Example 1

[0037] Example 1 provides an inorganic artificial stone, the component contents of which are shown in Table 1, and the preparation method is as follows:

[0038] Aggregate preparation steps:

[0039] Step 1: put fine tungsten tailings I, cement I, and metakaolin I into a stirring pot at a ratio of 59.0:24.0:7.0 and stir to obtain a mixed powder; water I, polymer emulsion I, and water reducer I are mixed at a ratio of 5.0:4.0:1.0 and then added, and the stirring time is 15 minutes.

[0040] Step 2: Pour the stirred raw materials into a mold and vacuum vibrate to form the mold. Set the vacuum degree to 0.1 MPa, the cylinder pressure to 0.3 MPa, the pressing and shaking time to 103 seconds, and demold to obtain a rough board.

[0041] Step 3: After pressing and forming, place the artificial stone slab in an environment of 20°C and 90% humidity for 24 hours; then place the shaped artificial stone slab in a steam curing box at 90°C for 48 hours;

[0042] Step 4: Use a cutting machine to cut the cured inorganic artificial stone slabs into blocks, then use a jaw crusher to crush the blocks of inorganic artificial stone slabs, and use a screen to screen to obtain aggregate with a particle size of 4.75mm-9.50mm.

[0043] Preparation steps of inorganic artificial stone:

[0044] S1. Aggregate, tungsten tailings dry material II, cement II, metakaolin II, polymer emulsion II, water II, and water reducer II are mixed, and the mixture is spread flat in a mold and vacuum-vibrated to form the mixture, and a rough board is obtained after demoulding;

[0045] S2. Place the pressed rough board into a steam curing box at 90°C for 48-72 hours to obtain polished inorganic artificial stone.

[0046] Example 2

[0047] Example 2 provides an inorganic artificial stone, the component contents of which are shown in Table 1, and the preparation method is as follows:

[0048] Aggregate preparation steps:

[0049] Step 1: Fine tungsten tailings I, coarse tungsten tailings I, cement I, and metakaolin I are placed in a mixing pot at a ratio of 56.0:3.0:23.8:7.2 and stirred to obtain a mixed powder. Water I, polymer emulsion I, and water reducer I are mixed at a ratio of 5.2:4.1:0.7 and then added, stirring for 15 minutes.

[0050] Step 2: Pour the stirred raw materials into the mold and vacuum vibrate and press them into shape. Set the vacuum degree to 0.1MPa, the cylinder pressure to 0.3MPa, the pressing and shaking time to 103s, and obtain the rough board after demolding.

[0051] Step 3: After pressing and forming, place the artificial stone board in an environment of 20℃ and 90% humidity for 24 hours. Then put the shaped artificial stone board into a steam curing box at 90℃ for 48 hours.

[0052] Step 4: Use a cutting machine to cut the cured inorganic artificial stone slabs into blocks, then use a jaw crusher to crush the blocks of inorganic artificial stone slabs, and use a screen to screen to obtain aggregates with a particle size of 4.75mm-9.50mm.

[0053] Preparation method of inorganic artificial stone:

[0054] S1. Aggregate, tungsten tailings dry material II, cement II, metakaolin II, polymer emulsion II, water II, and water reducer II are mixed, and the mixture is spread flat in a mold and vacuum-vibrated to form the mixture, and a rough board is obtained after demoulding;

[0055] S2. Place the pressed rough board into a steam curing box at 90°C for 48 hours to obtain polished inorganic artificial stone.

[0056] Examples 3 to 7

[0057] Examples 3 to 7 and Comparative Example 1 provide a series of inorganic artificial stones, prepared by the same method as in Example 2, wherein the component contents of the aggregate raw materials cement I, metakaolin I, tungsten tailings dry material I, polymer emulsion I, water I, and water reducer I are the same as the component contents of cement II, metakaolin II, tungsten tailings dry material II, polymer emulsion II, water II, and water reducer II, and their component contents are shown in Table 1.

[0058] Comparative Example 1

[0059] Comparative Example 1 provides an inorganic artificial stone, the component contents of which are shown in Table 1, and the preparation method is as follows:

[0060] Aggregate preparation method:

[0061] Step 1: Place quartz sand, cement, and metakaolin in a mixing pot at a ratio of 59.0:24.0:7.0 and stir to obtain a mixed powder. Then, add water, polymer emulsion, and water reducer in a ratio of 5.0:4.0:1.0 and stir for 15 minutes.

[0062] Step 2: Pour the stirred raw materials into a mold and vacuum vibrate to form the mold. Set the vacuum degree to 0.1 MPa, the cylinder pressure to 0.3 MPa, the pressing and shaking time to 103 seconds, and demold to obtain a rough board.

[0063] Step 3: After pressing and forming, place the artificial stone board in an environment of 20℃ and 90% humidity for 24 hours. Then put the shaped artificial stone board into a steam curing box at 90℃ for 48 hours.

[0064] Step 4: Use a cutting machine to cut the cured inorganic artificial stone slabs into blocks, then use a jaw crusher to crush the blocks of inorganic artificial stone slabs, and use a screen to screen to obtain aggregates with a particle size of 4.75mm-9.50mm.

[0065] Preparation method of inorganic artificial stone:

[0066] S1. Aggregate, quartz sand, cement II, metakaolin II, polymer emulsion II, water II, and water reducer II are mixed, and the mixture is spread flat in a mold and vacuum-vibrated and pressed into shape. After demolding, a rough board is obtained;

[0067] S2. Place the pressed rough board into a steam curing box at 90°C for 48 hours to obtain polished inorganic artificial stone.

[0068] Table 1 Examples 1 to 7 and Comparative Example 1

[0069]

[0070] Performance testing:

[0071] The prepared aggregate and inorganic artificial stone were tested for water absorption, crushing value and flexural strength, and the test standards are as follows: the results are shown in Table 2.

[0072] Water absorption test conditions: Conduct a 1h water absorption test in accordance with the national standard GB / T 17431.2-2010 "Lightweight aggregates and their test methods Part 2: Lightweight aggregate test methods".

[0073] Aggregate crushing value test conditions: Tested using the crushing index method in the national standard GB / T 14684-2011 "Construction Sand".

[0074] Test conditions for the flexural strength of inorganic artificial stone: The test is carried out in accordance with GB / T 35160-2017 "Test methods for synthetic stone", where the size of the compressive test block is a cube with a side length of 50±1mm.

[0075] Table 2

[0076]

[0077] As can be seen from Table 2, the present invention uses aggregate obtained by mixing, pressing, steaming and crushing cement I, metakaolin I, tungsten tailings dry material I, polymer emulsion I, water I and water reducer I, and then using it to prepare inorganic artificial stone, which has low water absorption, a crushing value reaching Class I standard, and higher flexural strength. The difference between Comparative Example 1 and the solution of the present application is that Comparative Example 1 uses conventional quartz sand to replace tungsten tailings, but the effect is not good.

[0078] The above is a detailed description of the embodiments of the present invention, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the scope of the present invention.

Claims

1. A method for preparing inorganic artificial stone, characterized in that: The steps include: S1. Cement I, metakaolin I, tungsten tailings dry material I, polymer emulsion I, water I, and water reducer I are mixed, pressed, steamed, and crushed to obtain aggregate; S2, mixing the aggregate prepared in step S1, cement II, metakaolin II, tungsten tailings dry material II, polymer emulsion II, water II and water reducer II and performing vibration pressing treatment; S3. Steam-curing the pressed product to obtain inorganic artificial stone; the particle size of the aggregate is in the range of 4.75 mm to 9.50 mm.

2. The method for preparing inorganic artificial stone according to claim 1, wherein: In step S3, the steaming temperature is 70-100°C.

3. The method for preparing inorganic artificial stone according to claim 1, wherein: In step S3, the steaming time is 48 to 72 hours.

4. The method for preparing inorganic artificial stone according to claim 1, wherein: The composition includes the following components calculated by weight:

5. The method for preparing inorganic artificial stone according to claim 1, wherein: The tungsten tailings dry material I and the tungsten tailings dry material II are independently selected from two particle size combinations of mesh size greater than 80 meshes and mesh size within the range of 28 to 80 meshes.

6. The method for preparing inorganic artificial stone according to claim 1, wherein: The water reducer I and water reducer II are independently selected from at least one of a sulfonate water reducer, a polycarboxylic acid water reducer, an aliphatic water reducer or a polyoxyethylene water reducer.

7. The method for preparing inorganic artificial stone according to claim 1, characterized in that: The polymer emulsion I and polymer emulsion II are independently selected from at least one of styrene-butadiene latex, styrene-acrylic latex, pure acrylic latex or acrylic emulsion.

8. An inorganic artificial stone, characterized in that: The method is prepared by any one of claims 1 to 7.

9. Use of the inorganic artificial stone according to claim 8 in decorative building materials.

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