Skin-friendly lime stone wear-resistant environment-friendly paving stone and preparation process thereof

Abstract

The present application relates to the technical field of ceramics, and particularly relates to an imitation lime stone wear-resistant environment-friendly paving stone and a preparation process thereof, and discloses an imitation lime stone wear-resistant environment-friendly paving stone and a preparation process thereof, wherein the paving stone comprises, from bottom to top, an environment-friendly high-strength blank body, a base glaze layer and a wear-resistant self-cleaning face glaze layer. The environment-friendly high-strength blank body is made of various tailing raw materials and functional components, and has a low sintering deformation rate; the base glaze layer forms natural mottled textures through in-glass in-situ glass phase separation, and does not need inkjet printing; the wear-resistant self-cleaning face glaze layer has a high-crystalline dense structure, and ensures that the textures are continuous after wear, and the face is not exposed and not patterned. The preparation process comprises tailing pretreatment, high-pressure forming, gradient glazing and segmented temperature control one-time sintering. The present application realizes efficient utilization of tailing resources, solves the problems of easy falling-off of traditional imitation lime stone textures, wear exposure and the like, and has environment-friendly, wear-resistant and appearance texture properties, and is suitable for various paving scenes.

Description

Technical Field

[0001] This invention relates to the field of ceramic technology, specifically to imitation limestone wear-resistant and environmentally friendly paving stones and their preparation process. Background Technology

[0002] Currently, there are many pain points in the imitation limestone paving stone industry. Traditional products mostly use inkjet printing technology to simulate the texture of natural limestone, but the texture is not natural and is easy to peel off. At the same time, the glaze generally has insufficient wear resistance, and the base material is easily exposed after wear, resulting in color difference or mottled appearance. The body is mostly made of conventional raw materials, which has low strength and high firing deformation rate, which easily leads to glaze cracking and peeling. The body and glaze have weak bonding, which further aggravates the risk of glaze peeling off. In addition, existing products fail to effectively utilize various tailings resources, resulting in insufficient environmental protection. Moreover, the manufacturing process parameters are unreasonable, making it difficult to balance texture naturalness, wear resistance and product stability, and failing to meet the performance and appearance requirements of paving stone for long-term use. Summary of the Invention

[0003] One objective of this invention is to solve at least the aforementioned problems through imitation limestone wear-resistant and environmentally friendly paving stones and their preparation process.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a wear-resistant and environmentally friendly paving stone imitating limestone, comprising, from bottom to top, an environmentally friendly high-strength body, a base color glaze layer, and a wear-resistant self-cleaning surface glaze layer. The environmentally friendly high-strength body comprises the following components by weight: 32-38 parts of granite tailings fine aggregate, 10-15 parts of calcined shell powder, 6-10 parts of lithium glaucophane tailings, 5-8 parts of kyanite tailings, 4-6 parts of tremolite, 3-5 parts of palygorskite, 8-12 parts of metakaolinite, 5-8 parts of fly ash microspheres, 3-5 parts of aluminate reinforcing phase, and 2-3 parts of composite activator.

[0005] Preferably, the composition includes 25-30 parts of borocalcite frit, 6-10 parts of calcined diatomite, 4-6 parts of calcined kaolin, 3-5 parts of pyrophyllite, 2-4 parts of illite, 1.0-1.5 parts of iron oxide-manganese oxide composite color stabilizer, and 0.5-1.0 parts of iron-manganese brown inorganic colorant.

[0006] Preferably, the wear-resistant self-cleaning glaze layer comprises the following components by weight: 30-35 parts of high-alumina lead-free frit, 5-7 parts of ultrafine quartz powder, 4-6 parts of quartz-feldspar compound powder, 2.0-2.5 parts of zinc oxide, 0.5-1.0 parts of cerium oxide, 2-4 parts of wollastonite, and 2-3 parts of plagioclase.

[0007] Preferably, the aluminate reinforcing phase is a mixture of active calcium aluminate powder and active magnesium aluminate powder in a weight ratio of 1:1; the composite activator is a mixture of alkali silicate activator and calcium carbonate activator in a weight ratio of 2:1.

[0008] Preferably, the boron-calcium-boron frit contains 8wt% to 12wt% boron oxide and 18wt% to 22wt% calcium oxide; the high-alumina lead-free frit contains 22wt% to 26wt% alumina.

[0009] The preparation process of the imitation limestone wear-resistant and environmentally friendly paving stone includes the following steps: (1) the tailings raw material is crushed, magnetically separated, graded and then dry-mixed, then wet-mixed and sealed at constant temperature for aging; (2) the aging mixture is high-pressure molded to obtain a blank; (3) the surface of the blank is coated with a base color glaze and pre-wetted in a thin layer, and then coated with a wear-resistant self-cleaning glaze to form a gradient inter-melting transition layer; (4) the glazed blank is fired once with a variable temperature rate and segmented temperature control to obtain the finished product.

[0010] Preferably, the sealed constant temperature aging temperature in step (1) is 25-35℃, and the aging time is 12-24h.

[0011] Preferably, in step (3), the thickness of the base glaze is 0.30-0.50 mm, and the thickness of the wear-resistant self-cleaning glaze is 0.25-0.35 mm.

[0012] Preferably, step (4) of temperature-controlled firing in stages includes: a low-temperature debinding stage where the temperature is raised from room temperature to 200-450°C at a rate of 1.5-2.5°C / min; a medium-temperature melting stage where the temperature is raised from 450°C to 1080°C at a rate of 3.0-4.0°C / min and held for 35-45 min; a high-temperature crystallization stage where the temperature is raised from 1080°C to 1220°C at a rate of 0.8-1.5°C / min and held for 25-35 min; and a slow-cooling crystallization stage where the temperature is lowered from 1220°C to 550°C at a rate of 0.5-1.0°C / min and then naturally cooled to room temperature after reaching 550°C.

[0013] Preferably, in step (1), the dry mixing speed is 200-300 r / min and the dry mixing time is 15-20 min. When wet mixing, the amount of water added is 18-22% of the total mass of the mixture, the wet mixing speed is 150-200 r / min and the wet mixing time is 25-30 min. In step (2), the high-pressure molding pressure is 30-40 MPa and the molding time is 10-15 s.

[0014] As described above, the imitation limestone wear-resistant and environmentally friendly paving stone and its preparation process provided by this invention have the following beneficial effects: This imitation limestone wear-resistant and environmentally friendly paving stone and its preparation process, through the reasonable combination of various tailings raw materials and functional components, constructs an environmentally friendly high-strength body and a double-layer glaze structure, which not only realizes the efficient utilization of tailings resources and improves the environmental friendliness of the product, but also significantly enhances the strength and density of the body, providing a stable bearing base for the glaze layer; the base color glaze layer forms a natural mottled texture through in-situ glass phase separation within the glaze, eliminating the need for inkjet printing, resulting in a more natural texture that is not easy to peel off; the wear-resistant self-cleaning glaze layer forms a highly crystalline and dense structure, ensuring that the texture is continuous and consistent after wear, without exposing the base or causing discoloration, thus solving the core pain points of traditional imitation stone bricks; the optimized preparation process, through segmented temperature control, gradient mutual melting and other technologies, further enhances the bonding force between the body and glaze, reduces defects such as glaze cracking and peeling, and takes into account the product's appearance, wear resistance and long-term stability, adapting to the usage needs of various paving scenarios. Detailed Implementation

[0015] The present invention will be further described below through specific embodiments.

[0016] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0017] This invention relates to a limestone-like wear-resistant and environmentally friendly paving stone, comprising, from bottom to top, an environmentally friendly high-strength body, a base glaze layer, and a wear-resistant self-cleaning glaze layer. The environmentally friendly high-strength body comprises the following components by weight: 32-38 parts of fine aggregate from granite tailings, 10-15 parts of calcined shell powder, 6-10 parts of lithium glaucophane tailings, 5-8 parts of kyanite tailings, 4-6 parts of tremolite, 3-5 parts of palygorskite, 8-12 parts of metakaolinite, 5-8 parts of fly ash microspheres, 3-5 parts of aluminate reinforcing phase, and 2-3 parts of composite activator. The fine aggregate from granite tailings serves as the main framework of the body, ensuring basic strength and density; the calcined shell powder balances body shaping and color adjustment, achieving color consistency between the body and the glaze layer, and solving the problem of color difference after wear. Lithium-based blue amphibole tailings and kyanite tailings synergistically form a low-temperature fluxing and low-shrinkage system, while tremolite and palygorskite form a high-temperature creep-resistant skeleton system. Together, they control the firing deformation rate of the body to within 0.3%, providing a smooth and stable load-bearing base for the glaze layer and preventing cracking and warping. Metakaolin enhances plasticity, fly ash microspheres fill pores, aluminate reinforcing phases strengthen overall strength, and a composite activator activates the tailings activity, laying the foundation for stable adhesion of the double-layer glaze structure. The base glaze layer forms a limestone-like mottled texture through in-situ glass phase separation within the glaze, restoring the natural texture of natural limestone. The wear-resistant, self-cleaning glaze layer is a highly crystalline and dense glaze layer, ensuring continuous and consistent texture after glaze wear, without exposing the base or causing surface defects, solving the industry pain point of appearance damage after wear in traditional imitation stone bricks.

[0018] The base glaze layer comprises the following components by weight: 25-30 parts borocalcite frit, 6-10 parts calcined diatomaceous earth, 4-6 parts calcined kaolin, 3-5 parts pyrophyllite, 2-4 parts illite, 1.0-1.5 parts iron oxide-manganese oxide composite color stabilizer, and 0.5-1.0 parts iron-manganese brown inorganic colorant. Calcined kaolin, pyrophyllite, illite, and calcined diatomaceous earth synergistically constitute a phase-separation induction system. The porous structure of the calcined diatomaceous earth ensures uniform dispersion of the colorant, preventing agglomeration. Pyrophyllite regulates the glaze surface to a matte finish, mimicking the warm texture of natural limestone. Illite refines the boundaries of the phase-separation texture, making the mottled effect more natural. During firing, the phase-separation induction system promotes micron-level liquid-phase separation in the glaze melt, producing a limestone-like mottled texture. This eliminates the need for inkjet printing, resulting in a more natural texture that is less prone to peeling. Boron-calcium stone frit acts as a melting carrier, ensuring the glaze layer melts fully without running, while also enhancing the adhesion between the body and the glaze. An iron oxide-manganese oxide composite color stabilizer locks in the brown hue of the iron-manganese pigment, preventing high-temperature fading and ensuring a high degree of harmony between the base glaze and the beige and light gray tones of the body. Even with slight wear on the surface glaze, the overall appearance remains consistent.

[0019] The wear-resistant self-cleaning glaze layer comprises the following components by weight: 30-35 parts high-alumina lead-free frit, 5-7 parts ultrafine quartz powder, 4-6 parts quartz-feldspar compound powder, 2.0-2.5 parts zinc oxide, 0.5-1.0 parts cerium oxide, 2-4 parts wollastonite, and 2-3 parts plagioclase. The quartz-feldspar compound powder, wollastonite, and plagioclase form a multi-morphological interwoven crystalline structure within the glaze, precipitating granular, needle-like, and platy crystals to construct a dense, wear-resistant framework, achieving high wear resistance and easy cleaning. The high-alumina lead-free frit ensures the glaze layer's translucency, clearly revealing the underlying phase separation texture while meeting environmental standards. It does not yellow or lose its gloss over long-term use, and simultaneously forms a highly crystalline, dense structure, ensuring that the mottled texture of the underlying glaze remains visible even after surface wear, achieving a seamless, non-blemished finish and maintaining a stone-like texture throughout. Ultrafine quartz powder further enhances wear resistance, zinc oxide refines grains to reduce glaze defects, and cerium oxide achieves anti-crystallization and anti-aging effects, ensuring the long-term stability of the glaze.

[0020] The aluminate reinforcing phase is composed of activated calcium aluminate powder and activated magnesium aluminate powder in a 1:1 weight ratio; the composite activator is composed of alkali silicate activator and calcium carbonate activator in a 2:1 weight ratio. The 1:1 ratio of activated calcium aluminate and activated magnesium aluminate can uniformly fill the internal pores of the body, eliminate micro-cracks, and strengthen the body-glaze interface, reducing the risk of glaze peeling and avoiding appearance inconsistencies caused by glaze peeling. This ensures a stable and consistent glaze finish without exposing the base or causing surface defects after wear. The 2:1 ratio of alkali silicate activator and calcium carbonate activator activates the active silicon and aluminum components in the tailings, promoting full hydration reactions; the latter assists in controlling the sintering process, improving the sintering uniformity and shrinkage consistency of the body, optimizing the matching degree of the body-glaze thermal expansion coefficients, solving the problems of glaze cracking and peeling, and providing a guarantee for the stable formation of phase separation textures within the glaze and the effective function of the wear-resistant glaze.

[0021] The boron-calcium stone frit contains 8wt%–12wt% boron oxide and 18wt%–22wt% calcium oxide; the high-alumina lead-free frit contains 22wt%–26wt% alumina. The boron-calcium stone frit provides a stable temperature range for in-situ phase separation within the base glaze, ensuring sufficient phase separation, clear texture, and a natural imitation limestone mottled effect. Calcium oxide enhances the stability of the glaze layer, preventing high-temperature glaze flow that could blur the texture, while also helping to adjust the hue, echoing the base color of the body and ensuring color continuity after glaze wear. For the high-alumina lead-free frit used in the top glaze, alumina balances crystalline phase precipitation and translucency, ensuring that the quartz-feldspar compound powder, wollastonite, and plagioclase fully crystalline to form a wear-resistant framework, without obscuring the underlying phase separation texture. Simultaneously, it ensures the glaze layer forms a highly crystalline and dense structure, achieving a continuous texture without revealing the base or causing surface damage after wear. The composition ranges of the two types of frits were experimentally screened and highly matched with their respective glaze formulations to ensure a smooth and defect-free glaze surface, achieving a synergistic presentation of phase separation texture and wear-resistant crystalline phase.

[0022] The preparation process of the imitation limestone wear-resistant and environmentally friendly paving stone includes the following steps: 1) The tailings raw material is crushed, magnetically separated, and graded, then dry-mixed, then wet-mixed and aged in a sealed constant temperature; 2) The aged mixture is high-pressure molded to obtain a blank; 3) The surface of the blank is coated with a base color glaze and pre-wetted in a thin layer, then coated with a wear-resistant self-cleaning glaze to form a gradient inter-fusion transition layer; 4) The glazed blank is fired once in a segmented temperature-controlled manner with a variable temperature rate to obtain the finished product. Step 1) Tailings pretreatment removes impurities and ensures raw material uniformity. Sealed aging allows tailings components to fully plasticize, laying the foundation for low deformation of the body and ensuring smooth glaze adhesion. Step 2) High-pressure molding increases the density of the body and ensures uniform body color, providing a guarantee for the synergy between the glaze and body tones. Step 3) Pre-wetting gradient intermelting process eliminates the glaze interface, enhances bonding, and prevents glaze peeling. The no-inking, no-printing design matches the phase separation formula within the glaze, ensuring that the glaze texture is generated in situ, resulting in a more natural and durable finish. Step 4) Segmented temperature-controlled single firing matches the temperature requirements for phase separation and crystallization, ensuring that the base glaze forms a clear, mottled texture and the surface glaze forms a highly crystalline and dense structure, guaranteeing continuous texture and no exposed base or mottled surface after glaze wear.

[0023] In step 1), the sealed, constant-temperature aging temperature is 25–35℃, and the aging time is 12–24 hours. Controlling the sealed, constant-temperature aging temperature at 25–35℃ for 12–24 hours promotes the uniform diffusion of moisture in the raw materials, allowing the particles to fully absorb water and plasticize. This prevents uneven moisture distribution from causing cracking and uneven density in the subsequent molding process. Simultaneously, it ensures the uniform dispersion of calcined seashell powder within the body, guaranteeing a uniform base color and ensuring harmony with the glaze color tone. It also prevents abrupt color changes after glaze wear due to uneven base color. A good aging effect results in a smooth, uniformly dense surface after molding, providing a stable base for glaze application, ensuring a smooth glaze surface, and facilitating the formation of uniform mottled textures in the base glaze and a dense, wear-resistant structure in the surface glaze. This ensures a stable and consistent glaze finish without exposing the base or causing unevenness after wear.

[0024] Step 3) The base glaze thickness is 0.30–0.50 mm, and the wear-resistant self-cleaning top glaze thickness is 0.25–0.35 mm. The two glazes form a gradient inter-melting transition layer through pre-wetting, without a clear interface layer. Controlling the base glaze thickness to 0.30–0.50 mm ensures full melting during firing, allowing the phase-separation induced system to form a full and clear imitation limestone mottled texture. Too thin a thickness results in indistinct textures, while too thick a thickness leads to glaze runs and blurred textures. Simultaneously, it ensures a uniform base glaze color that complements the body's base color, preventing the base from showing through or the surface from becoming mottled after glaze wear. Controlling the wear-resistant self-cleaning top glaze thickness to 0.25–0.35 mm ensures the top glaze forms a complete, highly crystalline, dense, wear-resistant protective layer while maintaining a semi-transparent texture. This prevents obscuring the phase-separation texture of the base glaze, and the semi-transparency naturally connects the base glaze to the body, avoiding color breaks when the top glaze peels off. By pre-wetting a thin layer of the base glaze, a gradient inter-fusion transition layer is formed, eliminating the potential for interface reflection and delamination between the two glaze layers, enhancing the bonding force of the glaze layers, reducing glaze peeling, and ensuring that the continuous texture of the base glaze can be directly exposed after the glaze surface is worn, thus achieving a full-body imitation stone effect.

[0025] Step 4) Segmented temperature control for single-stage firing with variable temperature rate includes: a low-temperature debinding stage where the temperature is raised from room temperature to 200–450°C at a rate of 1.5–2.5°C / min; a medium-temperature melting stage where the temperature is raised from 450°C to 1080°C at a rate of 3.0–4.0°C / min and held for 35–45 min; a high-temperature crystallization stage where the temperature is raised from 1080°C to 1220°C at a rate of 0.8–1.5°C / min and held for 25–35 min; and a slow cooling crystallization stage where the temperature is lowered from 1220°C to 550°C at a rate of 0.5–1.0°C / min, and then allowed to cool naturally to room temperature. The low-temperature debinding stage controls the heating rate to 1.5–2.5°C / min, systematically removing moisture and organic impurities from the body and glaze, preventing rapid heating that could cause gas to escape sharply and form pinholes and bubbles, thus laying a smooth base for subsequent phase separation and crystallization. In the medium-temperature melting section, the heating rate is increased to 3.0–4.0℃ / min to quickly reach the melting temperature range of the base glaze. This temperature is maintained for 35–45 minutes to ensure complete melting of the base glaze, providing a stable environment for the phase separation induction system to function and promoting the uniform formation of the imitation limestone mottled texture. In the high-temperature crystallization section, the heating rate is slowed to 0.8–1.5℃ / min and maintained for 25–35 minutes to ensure sufficient phase separation of the base glaze. Simultaneously, it promotes the in-situ crystallization of quartz-feldspar composite powder, wollastonite, and plagioclase in the surface glaze, forming a dense and wear-resistant skeleton. In the slow-cooling crystallization section, the cooling rate is controlled at 0.5–1.0℃ / min to slowly release internal stress, prevent glaze cracking, stabilize the crystal structure and glaze color, and allow for natural cooling after reaching 550℃. This further ensures a tight bond between the glaze layer and the body, guaranteeing continuous texture and preventing the base from being exposed or the surface from becoming mottled after glaze wear.

[0026] In step 1), the dry mixing speed is 200–300 r / min and the dry mixing time is 15–20 min. In wet mixing, the water content is 18–22% of the total mass of the mixture, the wet mixing speed is 150–200 r / min, and the wet mixing time is 25–30 min. In step 2), the high-pressure molding pressure is 30–40 MPa, and the molding time is 10–15 s. Step 1) Controlling the dry mixing speed and time ensures uniform mixing of the tailings raw materials and avoids component agglomeration. Reasonably controlling the water content, speed, and time in wet mixing ensures the mixture forms a uniform plastic clay, guaranteeing smooth subsequent molding. It also ensures uniform dispersion of the calcined shell powder, laying the foundation for a uniform base color in the green body. In step 2), the high-pressure molding parameters are optimized. A pressure of 30–40 MPa and a molding time of 10–15 s can improve the density of the green body, avoid internal porosity, reduce the risk of glaze cracking and peeling, and ensure regular green body dimensions.

[0027] The above are merely some specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing upon the protection scope of the present invention.

Claims

1. Imitation limestone wear-resistant and environmentally friendly paving stone, characterized by: From bottom to top, it includes an environmentally friendly high-strength body, a base glaze layer, and a wear-resistant self-cleaning glaze layer. The environmentally friendly high-strength body includes the following components by weight: 32-38 parts of granite tailings fine aggregate, 10-15 parts of calcined shell powder, 6-10 parts of lithium glaucophane tailings, 5-8 parts of kyanite tailings, 4-6 parts of tremolite, 3-5 parts of palygorskite, 8-12 parts of metakaolinite, 5-8 parts of fly ash microspheres, 3-5 parts of aluminate reinforcing phase, and 2-3 parts of composite activator.

2. The imitation limestone wear-resistant and environmentally friendly paving stone according to claim 1, characterized in that: The base color glaze layer comprises the following components by weight: 25-30 parts borocalcite frit, 6-10 parts calcined diatomaceous earth, 4-6 parts calcined kaolin, 3-5 parts pyrophyllite, 2-4 parts illite, 1.0-1.5 parts iron oxide-manganese oxide composite color stabilizer, and 0.5-1.0 parts iron-manganese brown inorganic colorant.

3. The imitation limestone wear-resistant and environmentally friendly paving stone according to claim 1, characterized in that: The wear-resistant self-cleaning glaze layer comprises the following components by weight: 30-35 parts of high-alumina lead-free frit, 5-7 parts of ultrafine quartz powder, 4-6 parts of quartz-feldspar compound powder, 2.0-2.5 parts of zinc oxide, 0.5-1.0 parts of cerium oxide, 2-4 parts of wollastonite, and 2-3 parts of plagioclase.

4. The imitation limestone wear-resistant and environmentally friendly paving stone according to claim 1, characterized in that: The aluminate reinforcing phase is a mixture of active calcium aluminate powder and active magnesium aluminate powder in a weight ratio of 1:1; the composite activator is a mixture of alkali silicate activator and calcium carbonate activator in a weight ratio of 2:

1.

5. The imitation limestone wear-resistant and environmentally friendly paving stone according to claim 1, characterized in that: The boron-calcium-bearing stone frit contains 8wt% to 12wt% boron oxide and 18wt% to 22wt% calcium oxide; the high-alumina lead-free frit contains 22wt% to 26wt% alumina.

6. The preparation process of the imitation limestone wear-resistant and environmentally friendly paving stone according to any one of claims 1-5, characterized in that: Includes the following steps: (1) The tailings raw material is crushed, magnetically separated, and classified, then dry-mixed, then wet-mixed and aged in a sealed constant temperature; (2) The aged mixture is high-pressure molded to obtain a blank; (3) The surface of the blank is coated with a base color glaze and pre-wetted in a thin layer, then coated with a wear-resistant self-cleaning glaze to form a gradient inter-fusion transition layer; (4) The glazed blank is fired once with a variable temperature rate and segmented temperature control to obtain the finished product.

7. The preparation process of the imitation limestone wear-resistant and environmentally friendly paving stone according to claim 6, characterized in that: In step (1), the sealed constant temperature aging temperature is 25-35℃, and the aging time is 12-24h.

8. The preparation process of the imitation limestone wear-resistant and environmentally friendly paving stone according to claim 6, characterized in that: In step (3), the thickness of the base glaze is 0.30-0.50 mm, and the thickness of the wear-resistant self-cleaning glaze is 0.25-0.35 mm.

9. The preparation process of the imitation limestone wear-resistant and environmentally friendly paving stone according to claim 6, characterized in that: Step (4) Temperature-controlled firing in stages includes: low-temperature debinding stage, heating from room temperature to 200-450℃ at a rate of 1.5-2.5℃ / min; medium-temperature melting stage, heating from 450℃ to 1080℃ at a rate of 3.0-4.0℃ / min, holding for 35-45min; high-temperature crystallization stage, heating from 1080℃ to 1220℃ at a rate of 0.8-1.5℃ / min, holding for 25-35min; slow cooling crystallization stage, cooling from 1220℃ to 550℃ at a rate of 0.5-1.0℃ / min, and then naturally cooling to room temperature after reaching 550℃.

10. The preparation process of the imitation limestone wear-resistant and environmentally friendly paving stone according to claim 6, characterized in that: In step (1), the dry mixing speed is 200-300 r / min and the dry mixing time is 15-20 min. When wet mixing, the amount of water added is 18-22% of the total mass of the mixture, the wet mixing speed is 150-200 r / min and the wet mixing time is 25-30 min. In step (2), the high pressure molding pressure is 30-40 MPa and the molding time is 10-15 s.