Method for preparing millstone from II-type anhydrous gypsum base

Abstract

The invention belongs to the technical field of concrete materials, and particularly relates to a method for preparing a millstone from a type II anhydrous gypsum base. The II-type anhydrous gypsum-based inorganic millstone concrete is prepared from the following raw materials: II-type anhydrous gypsum, building gypsum, yellow phosphorus slag, ash calcium, an additive, gravel, sand and water. The concrete raw materials comprise, by weight, 34 to 38 parts of II-type anhydrous gypsum, 1 to 3 parts of building gypsum, 1 to 3 parts of yellow phosphorus slag, 1 to 2 parts of ash calcium, 0.4 to 0.6 part of an additive, 25 to 30 parts of rubble with a particle size of 2 to 10 mm, 12 to 17 parts of rubble with a particle size of 10 to 16.5 mm, 12 to 13 parts of sand with a particle size of 20 to 50 meshes, 5 to 6 parts of quartz sand with a particle size of 60 to 90 meshes, and 12 to 13 parts of water. Through scientific and reasonable raw material ratio and rigorous and meticulous preparation process, many problems existing in preparation of the inorganic millstone from the II-type anhydrous gypsum in the prior art are successfully solved.

Description

Technical Field

[0001] This application belongs to the field of concrete materials technology, and in particular relates to a method for preparing terrazzo based on type II anhydrous gypsum. Background Technology

[0002] my country's technology for the resource utilization of phosphogypsum is basically mature, mainly used in cement retarders and various building materials. It is also used in gypsum self-leveling compounds, plastering mortars, and roadbed fillers. Inorganic terrazzo, as a green and environmentally friendly new building material, does not contain substances harmful to human health and the environment, perfectly aligning with current environmental protection concepts. Furthermore, it can meet various high-standard design requirements and is suitable for various building decoration projects, providing a durable, beautiful, and safe finish for building surfaces. With the introduction of the "dual carbon" target (carbon reduction and emission reduction), using phosphogypsum as a raw material to prepare low-carbon building materials will become the future trend of phosphogypsum waste utilization.

[0003] However, there is relatively little research on the preparation of inorganic grinding stones from type II anhydrous gypsum, and a systematic and complete preparation method and process parameters are lacking. On the one hand, since anhydrous gypsum itself has no strength, activators need to be added to activate its activity; on the other hand, problems such as gypsum softening when exposed to water also greatly limit the development of gypsum products.

[0004] Type II anhydrous gypsum possesses unique physicochemical properties. Its rational application in the preparation of inorganic grinding stones can not only solve the problem of phosphogypsum resource utilization but also develop new inorganic grinding stone materials with superior performance and low carbon footprint. Therefore, it is necessary to find an innovative method for preparing inorganic grinding stones using type II anhydrous gypsum so that the material can have high strength while avoiding problems such as cracking, hollowing, and softening when exposed to water. Summary of the Invention

[0005] To address the aforementioned technical problems in the existing technology, this application provides a method for preparing grinding stones based on type II anhydrous gypsum, specifically achieved through the following technical solution: A type II anhydrous gypsum-based inorganic terrazzo concrete is composed of the following raw materials: type II anhydrous gypsum, building gypsum, yellow phosphorus slag, lime, admixtures, crushed stone, sand, and water.

[0006] Furthermore, the aforementioned Type II anhydrous gypsum is a powder material obtained by calcining phosphogypsum at a temperature of 700-900℃ and then grinding and modifying it using a ball mill. This powder material has a pH value of 9-13.

[0007] Furthermore, the building gypsum is a hemihydrate gypsum obtained by calcining phosphogypsum at 150-210℃, with a 200-mesh sieve pass rate of 80%; its main component is CaSO4•1 / 2H2O, wherein the content of CaSO4•1 / 2H2O is >75%, the content of CaSO4•2H2O is ≤5%, and the content of AⅢ anhydrous gypsum is ≤8%.

[0008] Furthermore, the yellow phosphorus slag is a powder material obtained by ball milling and modification of waste residue discharged from the yellow phosphorus industry after high-temperature calcination. Its main components are silicon dioxide and calcium oxide.

[0009] Furthermore, the aforementioned quicklime is made from high-quality natural limestone with calcium carbonate as the main component. After being calcined at high temperature to become quicklime, it is then carefully selected, partially digested, and finally pulverized using a high-speed air-classifying hammer mill, achieving a fineness of over 600 mesh. It is a refined lime product with calcium hydroxide as the main component, containing calcium oxide and a small amount of calcium carbonate. It has a white and fine appearance, a pH value ≥12, and is strongly alkaline.

[0010] Furthermore, the additive is composed of the following raw materials in parts by weight: 30-60 parts aluminum sulfate, 30-35 parts carboxylic acid reducing agent, 30-120 parts adhesive powder, 1-2 parts calcium formate, 1-2 parts defoamer, and 0.1-0.5 parts cellulose.

[0011] Furthermore, the crushed stone is crushed stone with a particle size of 2~10mm and 10~16.5mm.

[0012] Furthermore, the sand is quartz sand of 20-50 mesh and 60-90 mesh.

[0013] Furthermore, the raw materials are in the following weight proportions: 34-38 parts of Type II anhydrous gypsum, 1-3 parts of building gypsum, 1-3 parts of yellow phosphorus slag, 1-2 parts of lime, 0.4-0.6 parts of admixture, 25-30 parts of 2-10mm crushed stone, 12-17 parts of 10-16.5mm crushed stone, 12-13 parts of 20-50 mesh sand, 5-6 parts of 60-90 mesh quartz sand, and 12-13 parts of water.

[0014] The specific preparation steps of the admixture are as follows: Pour each component into a mixer and stir slowly for 5-10 minutes to obtain a uniformly mixed admixture. This admixture plays a role in retarding setting, reducing water usage, improving the compressive and flexural strength of concrete, and enhancing workability in Type II anhydrous gypsum inorganic terrazzo concrete.

[0015] The method for preparing inorganic terrazzo from Type II anhydrous gypsum-based inorganic terrazzo concrete includes the following steps: (1) Preparation of materials: Weigh out type II anhydrous gypsum, building gypsum, yellow phosphorus slag, lime, admixture, crushed stone and sand according to the weight ratio, pour them into the mixer and mix evenly for later use; (2) Base cleaning: Clean up debris and dust in the construction area, check the flatness of the base, and the deviation should not exceed 3mm; if there are cracks or holes in the base, epoxy resin mortar should be used for repair first. (3) Install the separator strip: Select brass, aluminum alloy or PVC separator strips, with the height consistent with the thickness of the inorganic terrazzo layer, to ensure that the separator strip is firm and flat, and the top is flush with the subsequent inorganic terrazzo surface layer; (4) Apply interface agent: The interface agent should be mixed evenly according to the product instructions. Apply the interface agent evenly with a roller or brush, with a coating thickness of 0.2~0.3mm, to ensure that there is no missed coating or dripping on the substrate surface. (5) Inorganic terrazzo construction: First, start the mixer, then add the evenly mixed raw materials to the mixer, and finally add water in the proportion of weight. Mix thoroughly for 2-3 minutes to ensure that the slurry is uniform, without lumps, and has good fluidity before paving. The inorganic terrazzo slurry is paved manually, with the paving thickness flush with the top of the dividing strip. After paving, compact and smooth it with a trowel to ensure that the slurry is tightly bonded to the self-leveling layer without any hollow areas. For the corners and around the dividing strip, a small trowel is needed to carefully treat them to avoid gaps. (6) Grinding with grinding stones: Use 30-50 grit diamond grinding discs and a grinding machine to grind the surface of the inorganic grinding stones to remove the floating slurry and uneven parts, ensuring a smooth surface and grinding out dense and uniform stones with clear separation strips; after coarse grinding, clean the surface dust and replace with 100-200 grit resin grinding discs for fine grinding to eliminate coarse grinding marks and reduce surface roughness; after fine grinding, clean the surface dust and check for any missed grinding or scratches, and if any are found, grind them again; after fine grinding, replace with 400-800 grit resin grinding discs for fine grinding until the surface is smooth and has a preliminary gloss, and clean the surface dust and particles after fine grinding; (7) Grinding stone grouting: Type II anhydrous gypsum, cement and water are mixed in a certain proportion and stirred into a grout with good fluidity that can fill gaps and holes; the grouting material is evenly applied to the surface of the finely ground inorganic grinding stone with a brush or trowel to fill the holes, cracks and small gaps generated during the grinding process; after the grouting material has completely hardened, the surface is lightly ground with an 800-grit resin grinding disc to remove excess grouting material and make the surface smooth and uniform. (8) Grinding stone curing: Select a curing agent compatible with inorganic grinding stone, dilute it according to the product instructions, stir it evenly, and then apply it evenly to the surface of inorganic grinding stone to ensure complete surface coverage; (9) Polishing and waxing: After curing, first polish with 1000~1500 grit resin grinding pads until the surface has obvious gloss; then replace with 2000~3000 grit resin grinding pads for fine polishing to further enhance the surface gloss and ensure that the surface is free of scratches and has uniform color; after polishing, clean the surface dust, use stone-specific polishing wax, and use a waxing machine with a wool pad to evenly apply it to the surface with a thickness of 0.1~0.2mm. After each application, wait for the wax layer to dry before polishing with a polishing machine; repeat the application and polishing 2~3 times to ensure that the wax layer is uniform, has strong adhesion, and the surface is smooth and bright.

[0016] Furthermore, in step (1), when preparing materials, the larger weight parts of type II anhydrous gypsum, crushed stone and sand are added first, followed by the smaller weight parts of building gypsum, yellow phosphorus slag, lime and additives, to ensure that the raw materials can be fully and evenly mixed.

[0017] Furthermore, in step (2), if there is dust or dirt in the cracks or holes of the base layer, it can be washed clean with water, and the next construction process can be carried out after the base layer is dry.

[0018] Furthermore, in step (3), the separator strip can be adhered to the base layer using double-sided tape. If the base layer is relatively rough and the double-sided tape does not adhere firmly, an interface agent can be applied to the bottom of the separator strip before installation to enhance the adhesion with the base layer and ensure that the separator strip does not loosen or detach during construction. If the construction area is small and requires overall construction, step (3) can be ignored.

[0019] Furthermore, in step (4), if the substrate has a high water absorption rate, a second coat can be applied after the first coat of interface agent has dried to enhance the interface bonding strength.

[0020] Furthermore, in step (5), if the construction volume is large, when using a mixer for mixing, the evenly mixed raw materials can be added first, and then water can be added for mixing; if the construction volume is small, when using an aircraft drill for mixing, water should be added first, and then the evenly mixed raw materials should be added to ensure that no dry powder clumps appear in the slurry. The mixing time is started when the evenly mixed raw materials are added to the water or when the water is added to the evenly mixed raw materials.

[0021] Furthermore, in step (7), if holes and gaps still exist after lightly grinding the surface with an 800-mesh resin grinding disc, step (7) can be repeated to ensure that the ground surface is free of holes and gaps.

[0022] Furthermore, in step (8), if the surface absorbs quickly, it can be brushed again to enhance the curing effect; during the period of waiting for complete drying and curing, people should avoid stepping on it and water immersion.

[0023] Compared with the prior art, the technical effects created by this application are reflected in: The method for preparing inorganic grinding stones using type II anhydrous gypsum provided in this application successfully solves many problems existing in the preparation of inorganic grinding stones using type II anhydrous gypsum through scientific and reasonable raw material ratios and rigorous and meticulous preparation processes. On the one hand, it effectively stimulates the activity of type II anhydrous gypsum, significantly improves the strength of the inorganic grinding stone material, overcomes the inherent lack of strength and softening upon contact with water of anhydrous gypsum, and makes the prepared inorganic grinding stone material have superior performance, meeting various high-standard design requirements and suitable for various building decoration projects, providing a durable, beautiful, and safe finish for building floors. On the other hand, this method realizes the resource utilization of phosphogypsum, transforming phosphogypsum, originally a waste, into a new type of high-performance, low-carbon, and environmentally friendly inorganic grinding stone material, which conforms to current environmental protection concepts and "dual-carbon" target requirements, opening up new avenues for the utilization of phosphogypsum waste and having significant economic and social benefits. At the same time, this application optimizes the key process parameters in the preparation process, ensuring the quality and stability of the grinding stone, making the method highly operable and practical, and easy to promote and apply in industrial production. Detailed Implementation

[0024] The technical solution of this application will be further defined below with reference to specific implementation methods, but the scope of protection is not limited to the description.

[0025] Example 1 An inorganic terrazzo concrete was prepared using a type II anhydrous gypsum, comprising 35.2 parts type II anhydrous gypsum, 2.7 parts building gypsum, 2.7 parts yellow phosphorus slag, 1.4 parts lime, 0.57 parts admixture, 44 parts 2-10mm crushed stone, 14 parts 20-50 mesh sand, and 12.4 parts water.

[0026] The aforementioned Type II anhydrous gypsum is a powder material obtained by calcining phosphogypsum at 700-900℃ and then grinding and modifying it using a ball mill. This powder material has a pH value of 9-13.

[0027] The aforementioned yellow phosphorus slag is a powder material obtained by high-temperature calcination of waste residue from the yellow phosphorus industry, followed by ball milling modification. Its main components are silicon dioxide and calcium oxide.

[0028] The hemihydrate gypsum is obtained by calcining phosphogypsum at 150-210℃, with an 80% pass rate through a 200-mesh sieve. Its main component is CaSO4•1 / 2H2O, wherein the CaSO4•1 / 2H2O content is >75%, the CaSO4•2H2O content is ≤5%, and the AⅢ anhydrous gypsum content is ≤8%.

[0029] The aforementioned quicklime is made from high-quality natural limestone, primarily composed of calcium carbonate. After high-temperature calcination to become quicklime, it undergoes further refinement, partial digestion, and then is pulverized using a high-speed air-classifying hammer mill to achieve a fineness of over 600 mesh. It is a refined lime product, primarily composed of calcium hydroxide, containing calcium oxide and a small amount of calcium carbonate. It has a white and fine appearance, a pH value ≥12, and is strongly alkaline.

[0030] Example 2 An inorganic terrazzo concrete was prepared using type II anhydrous gypsum, comprising 37.9 parts type II anhydrous gypsum, 1.36 parts building gypsum, 1.22 parts lime, 0.47 parts admixture, 41.5 parts 10-16.5mm crushed stone, 12.1 parts 5-10mm crushed stone, 6 parts 2-5mm crushed stone, and 12.2 parts water.

[0031] The aforementioned Type II anhydrous gypsum is a powder material obtained by calcining phosphogypsum at 700-900℃ and then grinding and modifying it using a ball mill. This powder material has a pH value of 9-13.

[0032] The hemihydrate gypsum is obtained by calcining phosphogypsum at 150-210℃, with a 100% pass rate through a 400-mesh sieve. Its main component is CaSO4•1 / 2H2O, wherein the CaSO4•1 / 2H2O content is >75%, the CaSO4•2H2O content is ≤5%, and the AⅢ anhydrous gypsum content is ≤8%.

[0033] The aforementioned quicklime is made from high-quality natural limestone, primarily composed of calcium carbonate. After high-temperature calcination to become quicklime, it undergoes further refinement, partial digestion, and then is pulverized using a high-speed air-classifying hammer mill to achieve a fineness of over 600 mesh. It is a refined lime product, primarily composed of calcium hydroxide, containing calcium oxide and a small amount of calcium carbonate. It has a white and fine appearance, a pH value ≥12, and is strongly alkaline.

[0034] Example 3 An inorganic terrazzo concrete is prepared using type II anhydrous gypsum, comprising 36.5 parts type II anhydrous gypsum, 2.1 parts building gypsum, 2.1 parts yellow phosphorus slag, 1.3 parts lime, 0.47 parts admixture, 40 parts 5-10mm crushed stone, 18 parts 80-mesh sand, and 12.2 parts water.

[0035] The aforementioned Type II anhydrous gypsum is a powder material obtained by calcining phosphogypsum at 700-900℃ and then grinding and modifying it using a ball mill. This powder material has a pH value of 9-13.

[0036] The aforementioned yellow phosphorus slag is a powder material obtained by high-temperature calcination of waste residue from the yellow phosphorus industry, followed by ball milling modification. Its main components are silicon dioxide and calcium oxide.

[0037] The hemihydrate gypsum is obtained by calcining phosphogypsum at 150-210℃, with a 100% pass rate through a 400-mesh sieve. Its main component is CaSO4•1 / 2H2O, wherein the CaSO4•1 / 2H2O content is >75%, the CaSO4•2H2O content is ≤5%, and the AⅢ anhydrous gypsum content is ≤8%.

[0038] The aforementioned quicklime is made from high-quality natural limestone, primarily composed of calcium carbonate. After high-temperature calcination to become quicklime, it undergoes further refinement, partial digestion, and then is pulverized using a high-speed air-classifying hammer mill to achieve a fineness of over 600 mesh. It is a refined lime product, primarily composed of calcium hydroxide, containing calcium oxide and a small amount of calcium carbonate. It has a white and fine appearance, a pH value ≥12, and is strongly alkaline.

[0039] Example 4 An inorganic terrazzo concrete is prepared using type II anhydrous gypsum, comprising 36.5 parts type II anhydrous gypsum, 2.1 parts building gypsum, 2.1 parts yellow phosphorus slag, 1.3 parts lime, 0.55 parts admixture, 40 parts 5-10mm crushed stone, 12 parts 20-30 mesh sand, 6 parts 80 mesh sand, and 12.2 parts water.

[0040] The aforementioned Type II anhydrous gypsum is a powder material obtained by calcining phosphogypsum at 700-900℃ and then grinding and modifying it using a ball mill. This powder material has a pH value of 9-13.

[0041] The aforementioned yellow phosphorus slag is a powder material obtained by high-temperature calcination of waste residue from the yellow phosphorus industry, followed by ball milling modification. Its main components are silicon dioxide and calcium oxide.

[0042] The hemihydrate gypsum is obtained by calcining phosphogypsum at 150-210℃, with a 100% pass rate through a 400-mesh sieve. Its main component is CaSO4•1 / 2H2O, wherein the CaSO4•1 / 2H2O content is >75%, the CaSO4•2H2O content is ≤5%, and the AⅢ anhydrous gypsum content is ≤8%.

[0043] The aforementioned quicklime is made from high-quality natural limestone, primarily composed of calcium carbonate. After high-temperature calcination to become quicklime, it undergoes further refinement, partial digestion, and then is pulverized using a high-speed air-classifying hammer mill to achieve a fineness of over 600 mesh. It is a refined lime product, primarily composed of calcium hydroxide, containing calcium oxide and a small amount of calcium carbonate. It has a white and fine appearance, a pH value ≥12, and is strongly alkaline.

[0044] The specific test results of Example 1 are as follows:

[0045] Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the technical solution of the present invention is not limited to the above embodiments, and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the content disclosed in this invention should be considered within the scope of protection of this invention.

Claims

1. A type II anhydrous gypsum-based inorganic terrazzo concrete, characterized in that, It is composed of the following raw materials: Type II anhydrous gypsum, building gypsum, yellow phosphorus slag, lime, admixtures, crushed stone, sand, and water.

2. The Type II anhydrous gypsum-based inorganic terrazzo concrete according to claim 1, characterized in that, The aforementioned Type II anhydrous gypsum is a powder material obtained by calcining phosphogypsum at a temperature of 700~900℃ and then grinding and modifying it using a ball mill.

3. The Type II anhydrous gypsum-based inorganic terrazzo concrete according to claim 1, characterized in that, The building gypsum is a hemihydrate gypsum obtained by calcining phosphogypsum at 150-210℃, with a 200-mesh sieve pass rate of 80%; its main component is CaSO4•1 / 2H2O, of which the content of CaSO4•1 / 2H2O is >75%, the content of CaSO4•2H2O is ≤5%, and the content of AⅢ anhydrous gypsum is ≤8%.

4. The Type II anhydrous gypsum-based inorganic terrazzo concrete according to claim 1, characterized in that, The yellow phosphorus slag is a powder material obtained by ball milling and modification of waste residue discharged from the yellow phosphorus industry after high-temperature calcination. Its main components are silicon dioxide and calcium oxide.

5. The Type II anhydrous gypsum-based inorganic terrazzo concrete according to claim 1, characterized in that, The quicklime is made from high-quality natural limestone with calcium carbonate as the main component. After being calcined at high temperature to become quicklime, it is then selected, partially digested, and then pulverized by a high-speed air-classifying hammer mill, achieving a fineness of over 600 mesh.

6. The Type II anhydrous gypsum-based inorganic terrazzo concrete according to claim 1, characterized in that, The additive is composed of the following raw materials in parts by weight: 30-60 parts aluminum sulfate, 30-35 parts carboxylic acid reducing agent, 30-120 parts adhesive powder, 1-2 parts calcium formate, 1-2 parts defoamer, and 0.1-0.5 parts cellulose.

7. The Type II anhydrous gypsum-based inorganic terrazzo concrete according to claim 1, characterized in that, The crushed stone is crushed stone with a particle size of 2~10mm and 10~16.5mm.

8. The Type II anhydrous gypsum-based inorganic terrazzo concrete according to claim 1, characterized in that, The sand is quartz sand of 20-50 mesh and 60-90 mesh.

9. The Type II anhydrous gypsum-based inorganic terrazzo concrete according to claim 1, characterized in that, The raw materials are as follows by weight: 34-38 parts of Type II anhydrous gypsum, 1-3 parts of building gypsum, 1-3 parts of yellow phosphorus slag, 1-2 parts of lime, 0.4-0.6 parts of admixture, 25-30 parts of 2-10mm crushed stone, 12-17 parts of 10-16.5mm crushed stone, 12-13 parts of 20-50 mesh sand, 5-6 parts of 60-90 mesh quartz sand, and 12-13 parts of water.

10. The method for preparing inorganic terrazzo using type II anhydrous gypsum-based inorganic terrazzo concrete as described in claim 1, characterized in that, Includes the following steps: (1) Preparation of materials: Weigh out type II anhydrous gypsum, building gypsum, yellow phosphorus slag, lime, admixture, crushed stone and sand according to the weight ratio, pour them into the mixer and mix evenly for later use; (2) Base cleaning: Clean up debris and dust in the construction area, check the flatness of the base, and the deviation should not exceed 3mm; if there are cracks or holes in the base, epoxy resin mortar should be used for repair first. (3) Install the separator strip: Select brass, aluminum alloy or PVC separator strips. The height should be consistent with the thickness of the inorganic terrazzo layer to ensure that the separator strip is firm and flat, and the top is flush with the subsequent inorganic terrazzo surface layer. (4) Apply interface agent: The interface agent should be mixed evenly according to the product instructions. Apply the interface agent evenly with a roller or brush, with a coating thickness of 0.2~0.3mm, to ensure that there is no missed coating or dripping on the substrate surface. (5) Inorganic terrazzo construction: First, start the mixer, then add the evenly mixed raw materials to the mixer, and finally add water in the proportion of weight. Mix thoroughly for 2-3 minutes to ensure that the slurry is uniform, without lumps, and has good fluidity before paving. The inorganic terrazzo slurry is paved manually, with the paving thickness flush with the top of the dividing strip. After paving, compact and smooth it with a trowel to ensure that the slurry is tightly bonded to the self-leveling layer without any hollow areas. For the corners and around the dividing strip, a small trowel is needed to carefully treat them to avoid gaps. (6) Grinding with grinding stones: Use 30-50 grit diamond grinding discs and a grinding machine to grind the surface of the inorganic grinding stones to remove the floating slurry and uneven parts, ensuring a smooth surface and grinding out dense and uniform stones with clear separation strips; after coarse grinding, clean the surface dust and replace with 100-200 grit resin grinding discs for fine grinding to eliminate coarse grinding marks and reduce surface roughness; after fine grinding, clean the surface dust and check for any missed grinding or scratches, and if any are found, grind them again; after fine grinding, replace with 400-800 grit resin grinding discs for fine grinding until the surface is smooth and has a preliminary gloss, and clean the surface dust and particles after fine grinding; (7) Grinding stone grouting: Type II anhydrous gypsum, cement and water are mixed in a certain proportion and stirred into a grout with good fluidity that can fill gaps and holes; the grouting material is evenly applied to the surface of the finely ground inorganic grinding stone with a brush or trowel to fill the holes, cracks and small gaps generated during the grinding process. After the grout has completely hardened, lightly grind the surface with an 800-grit resin grinding disc to remove excess grout and make the surface smooth and uniform. (8) Grinding stone curing: Select a curing agent compatible with inorganic grinding stone, dilute it according to the product instructions, stir it evenly, and then apply it evenly to the surface of inorganic grinding stone to ensure complete surface coverage; (9) Polishing and waxing: After curing, first polish with 1000~1500 grit resin grinding pads until the surface has obvious gloss; then replace with 2000~3000 grit resin grinding pads for fine polishing to further enhance the surface gloss and ensure that the surface is free of scratches and has uniform color; after polishing, clean the surface dust, use stone-specific polishing wax, and use a waxing machine with a wool pad to evenly apply it to the surface with a thickness of 0.1~0.2mm. After each application, wait for the wax layer to dry before polishing with a polishing machine; repeat the application and polishing 2~3 times to ensure that the wax layer is uniform, has strong adhesion, and the surface is smooth and bright.

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